1e705c121SKalle Valo /****************************************************************************** 2e705c121SKalle Valo * 3e705c121SKalle Valo * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved. 4e705c121SKalle Valo * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5bce97731SSara Sharon * Copyright(c) 2016 Intel Deutschland GmbH 6e705c121SKalle Valo * 7e705c121SKalle Valo * Portions of this file are derived from the ipw3945 project, as well 8e705c121SKalle Valo * as portions of the ieee80211 subsystem header files. 9e705c121SKalle Valo * 10e705c121SKalle Valo * This program is free software; you can redistribute it and/or modify it 11e705c121SKalle Valo * under the terms of version 2 of the GNU General Public License as 12e705c121SKalle Valo * published by the Free Software Foundation. 13e705c121SKalle Valo * 14e705c121SKalle Valo * This program is distributed in the hope that it will be useful, but WITHOUT 15e705c121SKalle Valo * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16e705c121SKalle Valo * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 17e705c121SKalle Valo * more details. 18e705c121SKalle Valo * 19e705c121SKalle Valo * You should have received a copy of the GNU General Public License along with 20e705c121SKalle Valo * this program; if not, write to the Free Software Foundation, Inc., 21e705c121SKalle Valo * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 22e705c121SKalle Valo * 23e705c121SKalle Valo * The full GNU General Public License is included in this distribution in the 24e705c121SKalle Valo * file called LICENSE. 25e705c121SKalle Valo * 26e705c121SKalle Valo * Contact Information: 27d01c5366SEmmanuel Grumbach * Intel Linux Wireless <linuxwifi@intel.com> 28e705c121SKalle Valo * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 29e705c121SKalle Valo * 30e705c121SKalle Valo *****************************************************************************/ 31e705c121SKalle Valo #include <linux/sched.h> 32e705c121SKalle Valo #include <linux/wait.h> 33e705c121SKalle Valo #include <linux/gfp.h> 34e705c121SKalle Valo 35e705c121SKalle Valo #include "iwl-prph.h" 36e705c121SKalle Valo #include "iwl-io.h" 37e705c121SKalle Valo #include "internal.h" 38e705c121SKalle Valo #include "iwl-op-mode.h" 39e705c121SKalle Valo 40e705c121SKalle Valo /****************************************************************************** 41e705c121SKalle Valo * 42e705c121SKalle Valo * RX path functions 43e705c121SKalle Valo * 44e705c121SKalle Valo ******************************************************************************/ 45e705c121SKalle Valo 46e705c121SKalle Valo /* 47e705c121SKalle Valo * Rx theory of operation 48e705c121SKalle Valo * 49e705c121SKalle Valo * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs), 50e705c121SKalle Valo * each of which point to Receive Buffers to be filled by the NIC. These get 51e705c121SKalle Valo * used not only for Rx frames, but for any command response or notification 52e705c121SKalle Valo * from the NIC. The driver and NIC manage the Rx buffers by means 53e705c121SKalle Valo * of indexes into the circular buffer. 54e705c121SKalle Valo * 55e705c121SKalle Valo * Rx Queue Indexes 56e705c121SKalle Valo * The host/firmware share two index registers for managing the Rx buffers. 57e705c121SKalle Valo * 58e705c121SKalle Valo * The READ index maps to the first position that the firmware may be writing 59e705c121SKalle Valo * to -- the driver can read up to (but not including) this position and get 60e705c121SKalle Valo * good data. 61e705c121SKalle Valo * The READ index is managed by the firmware once the card is enabled. 62e705c121SKalle Valo * 63e705c121SKalle Valo * The WRITE index maps to the last position the driver has read from -- the 64e705c121SKalle Valo * position preceding WRITE is the last slot the firmware can place a packet. 65e705c121SKalle Valo * 66e705c121SKalle Valo * The queue is empty (no good data) if WRITE = READ - 1, and is full if 67e705c121SKalle Valo * WRITE = READ. 68e705c121SKalle Valo * 69e705c121SKalle Valo * During initialization, the host sets up the READ queue position to the first 70e705c121SKalle Valo * INDEX position, and WRITE to the last (READ - 1 wrapped) 71e705c121SKalle Valo * 72e705c121SKalle Valo * When the firmware places a packet in a buffer, it will advance the READ index 73e705c121SKalle Valo * and fire the RX interrupt. The driver can then query the READ index and 74e705c121SKalle Valo * process as many packets as possible, moving the WRITE index forward as it 75e705c121SKalle Valo * resets the Rx queue buffers with new memory. 76e705c121SKalle Valo * 77e705c121SKalle Valo * The management in the driver is as follows: 78e705c121SKalle Valo * + A list of pre-allocated RBDs is stored in iwl->rxq->rx_free. 79e705c121SKalle Valo * When the interrupt handler is called, the request is processed. 80e705c121SKalle Valo * The page is either stolen - transferred to the upper layer 81e705c121SKalle Valo * or reused - added immediately to the iwl->rxq->rx_free list. 82e705c121SKalle Valo * + When the page is stolen - the driver updates the matching queue's used 83e705c121SKalle Valo * count, detaches the RBD and transfers it to the queue used list. 84e705c121SKalle Valo * When there are two used RBDs - they are transferred to the allocator empty 85e705c121SKalle Valo * list. Work is then scheduled for the allocator to start allocating 86e705c121SKalle Valo * eight buffers. 87e705c121SKalle Valo * When there are another 6 used RBDs - they are transferred to the allocator 88e705c121SKalle Valo * empty list and the driver tries to claim the pre-allocated buffers and 89e705c121SKalle Valo * add them to iwl->rxq->rx_free. If it fails - it continues to claim them 90e705c121SKalle Valo * until ready. 91e705c121SKalle Valo * When there are 8+ buffers in the free list - either from allocation or from 92e705c121SKalle Valo * 8 reused unstolen pages - restock is called to update the FW and indexes. 93e705c121SKalle Valo * + In order to make sure the allocator always has RBDs to use for allocation 94e705c121SKalle Valo * the allocator has initial pool in the size of num_queues*(8-2) - the 95e705c121SKalle Valo * maximum missing RBDs per allocation request (request posted with 2 96e705c121SKalle Valo * empty RBDs, there is no guarantee when the other 6 RBDs are supplied). 97e705c121SKalle Valo * The queues supplies the recycle of the rest of the RBDs. 98e705c121SKalle Valo * + A received packet is processed and handed to the kernel network stack, 99e705c121SKalle Valo * detached from the iwl->rxq. The driver 'processed' index is updated. 100e705c121SKalle Valo * + If there are no allocated buffers in iwl->rxq->rx_free, 101e705c121SKalle Valo * the READ INDEX is not incremented and iwl->status(RX_STALLED) is set. 102e705c121SKalle Valo * If there were enough free buffers and RX_STALLED is set it is cleared. 103e705c121SKalle Valo * 104e705c121SKalle Valo * 105e705c121SKalle Valo * Driver sequence: 106e705c121SKalle Valo * 107e705c121SKalle Valo * iwl_rxq_alloc() Allocates rx_free 108e705c121SKalle Valo * iwl_pcie_rx_replenish() Replenishes rx_free list from rx_used, and calls 109e705c121SKalle Valo * iwl_pcie_rxq_restock. 110e705c121SKalle Valo * Used only during initialization. 111e705c121SKalle Valo * iwl_pcie_rxq_restock() Moves available buffers from rx_free into Rx 112e705c121SKalle Valo * queue, updates firmware pointers, and updates 113e705c121SKalle Valo * the WRITE index. 114e705c121SKalle Valo * iwl_pcie_rx_allocator() Background work for allocating pages. 115e705c121SKalle Valo * 116e705c121SKalle Valo * -- enable interrupts -- 117e705c121SKalle Valo * ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the 118e705c121SKalle Valo * READ INDEX, detaching the SKB from the pool. 119e705c121SKalle Valo * Moves the packet buffer from queue to rx_used. 120e705c121SKalle Valo * Posts and claims requests to the allocator. 121e705c121SKalle Valo * Calls iwl_pcie_rxq_restock to refill any empty 122e705c121SKalle Valo * slots. 123e705c121SKalle Valo * 124e705c121SKalle Valo * RBD life-cycle: 125e705c121SKalle Valo * 126e705c121SKalle Valo * Init: 127e705c121SKalle Valo * rxq.pool -> rxq.rx_used -> rxq.rx_free -> rxq.queue 128e705c121SKalle Valo * 129e705c121SKalle Valo * Regular Receive interrupt: 130e705c121SKalle Valo * Page Stolen: 131e705c121SKalle Valo * rxq.queue -> rxq.rx_used -> allocator.rbd_empty -> 132e705c121SKalle Valo * allocator.rbd_allocated -> rxq.rx_free -> rxq.queue 133e705c121SKalle Valo * Page not Stolen: 134e705c121SKalle Valo * rxq.queue -> rxq.rx_free -> rxq.queue 135e705c121SKalle Valo * ... 136e705c121SKalle Valo * 137e705c121SKalle Valo */ 138e705c121SKalle Valo 139e705c121SKalle Valo /* 140e705c121SKalle Valo * iwl_rxq_space - Return number of free slots available in queue. 141e705c121SKalle Valo */ 142e705c121SKalle Valo static int iwl_rxq_space(const struct iwl_rxq *rxq) 143e705c121SKalle Valo { 14496a6497bSSara Sharon /* Make sure rx queue size is a power of 2 */ 14596a6497bSSara Sharon WARN_ON(rxq->queue_size & (rxq->queue_size - 1)); 146e705c121SKalle Valo 147e705c121SKalle Valo /* 148e705c121SKalle Valo * There can be up to (RX_QUEUE_SIZE - 1) free slots, to avoid ambiguity 149e705c121SKalle Valo * between empty and completely full queues. 150e705c121SKalle Valo * The following is equivalent to modulo by RX_QUEUE_SIZE and is well 151e705c121SKalle Valo * defined for negative dividends. 152e705c121SKalle Valo */ 15396a6497bSSara Sharon return (rxq->read - rxq->write - 1) & (rxq->queue_size - 1); 154e705c121SKalle Valo } 155e705c121SKalle Valo 156e705c121SKalle Valo /* 157e705c121SKalle Valo * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr 158e705c121SKalle Valo */ 159e705c121SKalle Valo static inline __le32 iwl_pcie_dma_addr2rbd_ptr(dma_addr_t dma_addr) 160e705c121SKalle Valo { 161e705c121SKalle Valo return cpu_to_le32((u32)(dma_addr >> 8)); 162e705c121SKalle Valo } 163e705c121SKalle Valo 164dfcfeef9SSara Sharon static void iwl_pcie_write_prph_64_no_grab(struct iwl_trans *trans, u64 ofs, 165dfcfeef9SSara Sharon u64 val) 16696a6497bSSara Sharon { 167dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, ofs, val & 0xffffffff); 168dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, ofs + 4, val >> 32); 16996a6497bSSara Sharon } 17096a6497bSSara Sharon 171e705c121SKalle Valo /* 172e705c121SKalle Valo * iwl_pcie_rx_stop - stops the Rx DMA 173e705c121SKalle Valo */ 174e705c121SKalle Valo int iwl_pcie_rx_stop(struct iwl_trans *trans) 175e705c121SKalle Valo { 176d7fdd0e5SSara Sharon if (trans->cfg->mq_rx_supported) { 177d7fdd0e5SSara Sharon iwl_write_prph(trans, RFH_RXF_DMA_CFG, 0); 178d7fdd0e5SSara Sharon return iwl_poll_prph_bit(trans, RFH_GEN_STATUS, 179d7fdd0e5SSara Sharon RXF_DMA_IDLE, RXF_DMA_IDLE, 1000); 180d7fdd0e5SSara Sharon } else { 181e705c121SKalle Valo iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0); 182e705c121SKalle Valo return iwl_poll_direct_bit(trans, FH_MEM_RSSR_RX_STATUS_REG, 183d7fdd0e5SSara Sharon FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 184d7fdd0e5SSara Sharon 1000); 185d7fdd0e5SSara Sharon } 186e705c121SKalle Valo } 187e705c121SKalle Valo 188e705c121SKalle Valo /* 189e705c121SKalle Valo * iwl_pcie_rxq_inc_wr_ptr - Update the write pointer for the RX queue 190e705c121SKalle Valo */ 19178485054SSara Sharon static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans, 19278485054SSara Sharon struct iwl_rxq *rxq) 193e705c121SKalle Valo { 194e705c121SKalle Valo u32 reg; 195e705c121SKalle Valo 196e705c121SKalle Valo lockdep_assert_held(&rxq->lock); 197e705c121SKalle Valo 198e705c121SKalle Valo /* 199e705c121SKalle Valo * explicitly wake up the NIC if: 200e705c121SKalle Valo * 1. shadow registers aren't enabled 201e705c121SKalle Valo * 2. there is a chance that the NIC is asleep 202e705c121SKalle Valo */ 203e705c121SKalle Valo if (!trans->cfg->base_params->shadow_reg_enable && 204e705c121SKalle Valo test_bit(STATUS_TPOWER_PMI, &trans->status)) { 205e705c121SKalle Valo reg = iwl_read32(trans, CSR_UCODE_DRV_GP1); 206e705c121SKalle Valo 207e705c121SKalle Valo if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { 208e705c121SKalle Valo IWL_DEBUG_INFO(trans, "Rx queue requesting wakeup, GP1 = 0x%x\n", 209e705c121SKalle Valo reg); 210e705c121SKalle Valo iwl_set_bit(trans, CSR_GP_CNTRL, 211e705c121SKalle Valo CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); 212e705c121SKalle Valo rxq->need_update = true; 213e705c121SKalle Valo return; 214e705c121SKalle Valo } 215e705c121SKalle Valo } 216e705c121SKalle Valo 217e705c121SKalle Valo rxq->write_actual = round_down(rxq->write, 8); 21896a6497bSSara Sharon if (trans->cfg->mq_rx_supported) 2191554ed20SSara Sharon iwl_write32(trans, RFH_Q_FRBDCB_WIDX_TRG(rxq->id), 22096a6497bSSara Sharon rxq->write_actual); 2211316d595SSara Sharon else 222e705c121SKalle Valo iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, rxq->write_actual); 223e705c121SKalle Valo } 224e705c121SKalle Valo 225e705c121SKalle Valo static void iwl_pcie_rxq_check_wrptr(struct iwl_trans *trans) 226e705c121SKalle Valo { 227e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 22878485054SSara Sharon int i; 229e705c121SKalle Valo 23078485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 23178485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 232e705c121SKalle Valo 233e705c121SKalle Valo if (!rxq->need_update) 23478485054SSara Sharon continue; 23578485054SSara Sharon spin_lock(&rxq->lock); 23678485054SSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, rxq); 237e705c121SKalle Valo rxq->need_update = false; 238e705c121SKalle Valo spin_unlock(&rxq->lock); 239e705c121SKalle Valo } 24078485054SSara Sharon } 241e705c121SKalle Valo 242e0e168dcSGregory Greenman /* 2432047fa54SSara Sharon * iwl_pcie_rxmq_restock - restock implementation for multi-queue rx 244e0e168dcSGregory Greenman */ 2452047fa54SSara Sharon static void iwl_pcie_rxmq_restock(struct iwl_trans *trans, 24696a6497bSSara Sharon struct iwl_rxq *rxq) 24796a6497bSSara Sharon { 24896a6497bSSara Sharon struct iwl_rx_mem_buffer *rxb; 24996a6497bSSara Sharon 25096a6497bSSara Sharon /* 25196a6497bSSara Sharon * If the device isn't enabled - no need to try to add buffers... 25296a6497bSSara Sharon * This can happen when we stop the device and still have an interrupt 25396a6497bSSara Sharon * pending. We stop the APM before we sync the interrupts because we 25496a6497bSSara Sharon * have to (see comment there). On the other hand, since the APM is 25596a6497bSSara Sharon * stopped, we cannot access the HW (in particular not prph). 25696a6497bSSara Sharon * So don't try to restock if the APM has been already stopped. 25796a6497bSSara Sharon */ 25896a6497bSSara Sharon if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 25996a6497bSSara Sharon return; 26096a6497bSSara Sharon 26196a6497bSSara Sharon spin_lock(&rxq->lock); 26296a6497bSSara Sharon while (rxq->free_count) { 26396a6497bSSara Sharon __le64 *bd = (__le64 *)rxq->bd; 26496a6497bSSara Sharon 26596a6497bSSara Sharon /* Get next free Rx buffer, remove from free list */ 26696a6497bSSara Sharon rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer, 26796a6497bSSara Sharon list); 26896a6497bSSara Sharon list_del(&rxb->list); 26996a6497bSSara Sharon 27096a6497bSSara Sharon /* 12 first bits are expected to be empty */ 27196a6497bSSara Sharon WARN_ON(rxb->page_dma & DMA_BIT_MASK(12)); 27296a6497bSSara Sharon /* Point to Rx buffer via next RBD in circular buffer */ 27396a6497bSSara Sharon bd[rxq->write] = cpu_to_le64(rxb->page_dma | rxb->vid); 27496a6497bSSara Sharon rxq->write = (rxq->write + 1) & MQ_RX_TABLE_MASK; 27596a6497bSSara Sharon rxq->free_count--; 27696a6497bSSara Sharon } 27796a6497bSSara Sharon spin_unlock(&rxq->lock); 27896a6497bSSara Sharon 27996a6497bSSara Sharon /* 28096a6497bSSara Sharon * If we've added more space for the firmware to place data, tell it. 28196a6497bSSara Sharon * Increment device's write pointer in multiples of 8. 28296a6497bSSara Sharon */ 28396a6497bSSara Sharon if (rxq->write_actual != (rxq->write & ~0x7)) { 28496a6497bSSara Sharon spin_lock(&rxq->lock); 28596a6497bSSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, rxq); 28696a6497bSSara Sharon spin_unlock(&rxq->lock); 28796a6497bSSara Sharon } 28896a6497bSSara Sharon } 28996a6497bSSara Sharon 290e705c121SKalle Valo /* 2912047fa54SSara Sharon * iwl_pcie_rxsq_restock - restock implementation for single queue rx 292e705c121SKalle Valo */ 2932047fa54SSara Sharon static void iwl_pcie_rxsq_restock(struct iwl_trans *trans, 294e0e168dcSGregory Greenman struct iwl_rxq *rxq) 295e705c121SKalle Valo { 296e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 297e705c121SKalle Valo 298e705c121SKalle Valo /* 299e705c121SKalle Valo * If the device isn't enabled - not need to try to add buffers... 300e705c121SKalle Valo * This can happen when we stop the device and still have an interrupt 301e705c121SKalle Valo * pending. We stop the APM before we sync the interrupts because we 302e705c121SKalle Valo * have to (see comment there). On the other hand, since the APM is 303e705c121SKalle Valo * stopped, we cannot access the HW (in particular not prph). 304e705c121SKalle Valo * So don't try to restock if the APM has been already stopped. 305e705c121SKalle Valo */ 306e705c121SKalle Valo if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 307e705c121SKalle Valo return; 308e705c121SKalle Valo 309e705c121SKalle Valo spin_lock(&rxq->lock); 310e705c121SKalle Valo while ((iwl_rxq_space(rxq) > 0) && (rxq->free_count)) { 31196a6497bSSara Sharon __le32 *bd = (__le32 *)rxq->bd; 312e705c121SKalle Valo /* The overwritten rxb must be a used one */ 313e705c121SKalle Valo rxb = rxq->queue[rxq->write]; 314e705c121SKalle Valo BUG_ON(rxb && rxb->page); 315e705c121SKalle Valo 316e705c121SKalle Valo /* Get next free Rx buffer, remove from free list */ 317e705c121SKalle Valo rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer, 318e705c121SKalle Valo list); 319e705c121SKalle Valo list_del(&rxb->list); 320e705c121SKalle Valo 321e705c121SKalle Valo /* Point to Rx buffer via next RBD in circular buffer */ 32296a6497bSSara Sharon bd[rxq->write] = iwl_pcie_dma_addr2rbd_ptr(rxb->page_dma); 323e705c121SKalle Valo rxq->queue[rxq->write] = rxb; 324e705c121SKalle Valo rxq->write = (rxq->write + 1) & RX_QUEUE_MASK; 325e705c121SKalle Valo rxq->free_count--; 326e705c121SKalle Valo } 327e705c121SKalle Valo spin_unlock(&rxq->lock); 328e705c121SKalle Valo 329e705c121SKalle Valo /* If we've added more space for the firmware to place data, tell it. 330e705c121SKalle Valo * Increment device's write pointer in multiples of 8. */ 331e705c121SKalle Valo if (rxq->write_actual != (rxq->write & ~0x7)) { 332e705c121SKalle Valo spin_lock(&rxq->lock); 33378485054SSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, rxq); 334e705c121SKalle Valo spin_unlock(&rxq->lock); 335e705c121SKalle Valo } 336e705c121SKalle Valo } 337e705c121SKalle Valo 338e705c121SKalle Valo /* 339e0e168dcSGregory Greenman * iwl_pcie_rxq_restock - refill RX queue from pre-allocated pool 340e0e168dcSGregory Greenman * 341e0e168dcSGregory Greenman * If there are slots in the RX queue that need to be restocked, 342e0e168dcSGregory Greenman * and we have free pre-allocated buffers, fill the ranks as much 343e0e168dcSGregory Greenman * as we can, pulling from rx_free. 344e0e168dcSGregory Greenman * 345e0e168dcSGregory Greenman * This moves the 'write' index forward to catch up with 'processed', and 346e0e168dcSGregory Greenman * also updates the memory address in the firmware to reference the new 347e0e168dcSGregory Greenman * target buffer. 348e0e168dcSGregory Greenman */ 349e0e168dcSGregory Greenman static 350e0e168dcSGregory Greenman void iwl_pcie_rxq_restock(struct iwl_trans *trans, struct iwl_rxq *rxq) 351e0e168dcSGregory Greenman { 352e0e168dcSGregory Greenman if (trans->cfg->mq_rx_supported) 3532047fa54SSara Sharon iwl_pcie_rxmq_restock(trans, rxq); 354e0e168dcSGregory Greenman else 3552047fa54SSara Sharon iwl_pcie_rxsq_restock(trans, rxq); 356e0e168dcSGregory Greenman } 357e0e168dcSGregory Greenman 358e0e168dcSGregory Greenman /* 359e705c121SKalle Valo * iwl_pcie_rx_alloc_page - allocates and returns a page. 360e705c121SKalle Valo * 361e705c121SKalle Valo */ 362e705c121SKalle Valo static struct page *iwl_pcie_rx_alloc_page(struct iwl_trans *trans, 363e705c121SKalle Valo gfp_t priority) 364e705c121SKalle Valo { 365e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 366e705c121SKalle Valo struct page *page; 367e705c121SKalle Valo gfp_t gfp_mask = priority; 368e705c121SKalle Valo 369e705c121SKalle Valo if (trans_pcie->rx_page_order > 0) 370e705c121SKalle Valo gfp_mask |= __GFP_COMP; 371e705c121SKalle Valo 372e705c121SKalle Valo /* Alloc a new receive buffer */ 373e705c121SKalle Valo page = alloc_pages(gfp_mask, trans_pcie->rx_page_order); 374e705c121SKalle Valo if (!page) { 375e705c121SKalle Valo if (net_ratelimit()) 376e705c121SKalle Valo IWL_DEBUG_INFO(trans, "alloc_pages failed, order: %d\n", 377e705c121SKalle Valo trans_pcie->rx_page_order); 37878485054SSara Sharon /* 37978485054SSara Sharon * Issue an error if we don't have enough pre-allocated 38078485054SSara Sharon * buffers. 381e705c121SKalle Valo ` */ 38278485054SSara Sharon if (!(gfp_mask & __GFP_NOWARN) && net_ratelimit()) 383e705c121SKalle Valo IWL_CRIT(trans, 38478485054SSara Sharon "Failed to alloc_pages\n"); 385e705c121SKalle Valo return NULL; 386e705c121SKalle Valo } 387e705c121SKalle Valo return page; 388e705c121SKalle Valo } 389e705c121SKalle Valo 390e705c121SKalle Valo /* 391e705c121SKalle Valo * iwl_pcie_rxq_alloc_rbs - allocate a page for each used RBD 392e705c121SKalle Valo * 393e705c121SKalle Valo * A used RBD is an Rx buffer that has been given to the stack. To use it again 394e705c121SKalle Valo * a page must be allocated and the RBD must point to the page. This function 395e705c121SKalle Valo * doesn't change the HW pointer but handles the list of pages that is used by 396e705c121SKalle Valo * iwl_pcie_rxq_restock. The latter function will update the HW to use the newly 397e705c121SKalle Valo * allocated buffers. 398e705c121SKalle Valo */ 39978485054SSara Sharon static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority, 40078485054SSara Sharon struct iwl_rxq *rxq) 401e705c121SKalle Valo { 402e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 403e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 404e705c121SKalle Valo struct page *page; 405e705c121SKalle Valo 406e705c121SKalle Valo while (1) { 407e705c121SKalle Valo spin_lock(&rxq->lock); 408e705c121SKalle Valo if (list_empty(&rxq->rx_used)) { 409e705c121SKalle Valo spin_unlock(&rxq->lock); 410e705c121SKalle Valo return; 411e705c121SKalle Valo } 412e705c121SKalle Valo spin_unlock(&rxq->lock); 413e705c121SKalle Valo 414e705c121SKalle Valo /* Alloc a new receive buffer */ 415e705c121SKalle Valo page = iwl_pcie_rx_alloc_page(trans, priority); 416e705c121SKalle Valo if (!page) 417e705c121SKalle Valo return; 418e705c121SKalle Valo 419e705c121SKalle Valo spin_lock(&rxq->lock); 420e705c121SKalle Valo 421e705c121SKalle Valo if (list_empty(&rxq->rx_used)) { 422e705c121SKalle Valo spin_unlock(&rxq->lock); 423e705c121SKalle Valo __free_pages(page, trans_pcie->rx_page_order); 424e705c121SKalle Valo return; 425e705c121SKalle Valo } 426e705c121SKalle Valo rxb = list_first_entry(&rxq->rx_used, struct iwl_rx_mem_buffer, 427e705c121SKalle Valo list); 428e705c121SKalle Valo list_del(&rxb->list); 429e705c121SKalle Valo spin_unlock(&rxq->lock); 430e705c121SKalle Valo 431e705c121SKalle Valo BUG_ON(rxb->page); 432e705c121SKalle Valo rxb->page = page; 433e705c121SKalle Valo /* Get physical address of the RB */ 434e705c121SKalle Valo rxb->page_dma = 435e705c121SKalle Valo dma_map_page(trans->dev, page, 0, 436e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 437e705c121SKalle Valo DMA_FROM_DEVICE); 438e705c121SKalle Valo if (dma_mapping_error(trans->dev, rxb->page_dma)) { 439e705c121SKalle Valo rxb->page = NULL; 440e705c121SKalle Valo spin_lock(&rxq->lock); 441e705c121SKalle Valo list_add(&rxb->list, &rxq->rx_used); 442e705c121SKalle Valo spin_unlock(&rxq->lock); 443e705c121SKalle Valo __free_pages(page, trans_pcie->rx_page_order); 444e705c121SKalle Valo return; 445e705c121SKalle Valo } 446e705c121SKalle Valo 447e705c121SKalle Valo spin_lock(&rxq->lock); 448e705c121SKalle Valo 449e705c121SKalle Valo list_add_tail(&rxb->list, &rxq->rx_free); 450e705c121SKalle Valo rxq->free_count++; 451e705c121SKalle Valo 452e705c121SKalle Valo spin_unlock(&rxq->lock); 453e705c121SKalle Valo } 454e705c121SKalle Valo } 455e705c121SKalle Valo 45678485054SSara Sharon static void iwl_pcie_free_rbs_pool(struct iwl_trans *trans) 457e705c121SKalle Valo { 458e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 459e705c121SKalle Valo int i; 460e705c121SKalle Valo 4617b542436SSara Sharon for (i = 0; i < RX_POOL_SIZE; i++) { 46278485054SSara Sharon if (!trans_pcie->rx_pool[i].page) 463e705c121SKalle Valo continue; 46478485054SSara Sharon dma_unmap_page(trans->dev, trans_pcie->rx_pool[i].page_dma, 465e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 466e705c121SKalle Valo DMA_FROM_DEVICE); 46778485054SSara Sharon __free_pages(trans_pcie->rx_pool[i].page, 46878485054SSara Sharon trans_pcie->rx_page_order); 46978485054SSara Sharon trans_pcie->rx_pool[i].page = NULL; 470e705c121SKalle Valo } 471e705c121SKalle Valo } 472e705c121SKalle Valo 473e705c121SKalle Valo /* 474e705c121SKalle Valo * iwl_pcie_rx_allocator - Allocates pages in the background for RX queues 475e705c121SKalle Valo * 476e705c121SKalle Valo * Allocates for each received request 8 pages 477e705c121SKalle Valo * Called as a scheduled work item. 478e705c121SKalle Valo */ 479e705c121SKalle Valo static void iwl_pcie_rx_allocator(struct iwl_trans *trans) 480e705c121SKalle Valo { 481e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 482e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 483e705c121SKalle Valo struct list_head local_empty; 484e705c121SKalle Valo int pending = atomic_xchg(&rba->req_pending, 0); 485e705c121SKalle Valo 486e705c121SKalle Valo IWL_DEBUG_RX(trans, "Pending allocation requests = %d\n", pending); 487e705c121SKalle Valo 488e705c121SKalle Valo /* If we were scheduled - there is at least one request */ 489e705c121SKalle Valo spin_lock(&rba->lock); 490e705c121SKalle Valo /* swap out the rba->rbd_empty to a local list */ 491e705c121SKalle Valo list_replace_init(&rba->rbd_empty, &local_empty); 492e705c121SKalle Valo spin_unlock(&rba->lock); 493e705c121SKalle Valo 494e705c121SKalle Valo while (pending) { 495e705c121SKalle Valo int i; 496e705c121SKalle Valo struct list_head local_allocated; 49778485054SSara Sharon gfp_t gfp_mask = GFP_KERNEL; 49878485054SSara Sharon 49978485054SSara Sharon /* Do not post a warning if there are only a few requests */ 50078485054SSara Sharon if (pending < RX_PENDING_WATERMARK) 50178485054SSara Sharon gfp_mask |= __GFP_NOWARN; 502e705c121SKalle Valo 503e705c121SKalle Valo INIT_LIST_HEAD(&local_allocated); 504e705c121SKalle Valo 505e705c121SKalle Valo for (i = 0; i < RX_CLAIM_REQ_ALLOC;) { 506e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 507e705c121SKalle Valo struct page *page; 508e705c121SKalle Valo 509e705c121SKalle Valo /* List should never be empty - each reused RBD is 510e705c121SKalle Valo * returned to the list, and initial pool covers any 511e705c121SKalle Valo * possible gap between the time the page is allocated 512e705c121SKalle Valo * to the time the RBD is added. 513e705c121SKalle Valo */ 514e705c121SKalle Valo BUG_ON(list_empty(&local_empty)); 515e705c121SKalle Valo /* Get the first rxb from the rbd list */ 516e705c121SKalle Valo rxb = list_first_entry(&local_empty, 517e705c121SKalle Valo struct iwl_rx_mem_buffer, list); 518e705c121SKalle Valo BUG_ON(rxb->page); 519e705c121SKalle Valo 520e705c121SKalle Valo /* Alloc a new receive buffer */ 52178485054SSara Sharon page = iwl_pcie_rx_alloc_page(trans, gfp_mask); 522e705c121SKalle Valo if (!page) 523e705c121SKalle Valo continue; 524e705c121SKalle Valo rxb->page = page; 525e705c121SKalle Valo 526e705c121SKalle Valo /* Get physical address of the RB */ 527e705c121SKalle Valo rxb->page_dma = dma_map_page(trans->dev, page, 0, 528e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 529e705c121SKalle Valo DMA_FROM_DEVICE); 530e705c121SKalle Valo if (dma_mapping_error(trans->dev, rxb->page_dma)) { 531e705c121SKalle Valo rxb->page = NULL; 532e705c121SKalle Valo __free_pages(page, trans_pcie->rx_page_order); 533e705c121SKalle Valo continue; 534e705c121SKalle Valo } 535e705c121SKalle Valo 536e705c121SKalle Valo /* move the allocated entry to the out list */ 537e705c121SKalle Valo list_move(&rxb->list, &local_allocated); 538e705c121SKalle Valo i++; 539e705c121SKalle Valo } 540e705c121SKalle Valo 541e705c121SKalle Valo pending--; 542e705c121SKalle Valo if (!pending) { 543e705c121SKalle Valo pending = atomic_xchg(&rba->req_pending, 0); 544e705c121SKalle Valo IWL_DEBUG_RX(trans, 545e705c121SKalle Valo "Pending allocation requests = %d\n", 546e705c121SKalle Valo pending); 547e705c121SKalle Valo } 548e705c121SKalle Valo 549e705c121SKalle Valo spin_lock(&rba->lock); 550e705c121SKalle Valo /* add the allocated rbds to the allocator allocated list */ 551e705c121SKalle Valo list_splice_tail(&local_allocated, &rba->rbd_allocated); 552e705c121SKalle Valo /* get more empty RBDs for current pending requests */ 553e705c121SKalle Valo list_splice_tail_init(&rba->rbd_empty, &local_empty); 554e705c121SKalle Valo spin_unlock(&rba->lock); 555e705c121SKalle Valo 556e705c121SKalle Valo atomic_inc(&rba->req_ready); 557e705c121SKalle Valo } 558e705c121SKalle Valo 559e705c121SKalle Valo spin_lock(&rba->lock); 560e705c121SKalle Valo /* return unused rbds to the allocator empty list */ 561e705c121SKalle Valo list_splice_tail(&local_empty, &rba->rbd_empty); 562e705c121SKalle Valo spin_unlock(&rba->lock); 563e705c121SKalle Valo } 564e705c121SKalle Valo 565e705c121SKalle Valo /* 566d56daea4SSara Sharon * iwl_pcie_rx_allocator_get - returns the pre-allocated pages 567e705c121SKalle Valo .* 568e705c121SKalle Valo .* Called by queue when the queue posted allocation request and 569e705c121SKalle Valo * has freed 8 RBDs in order to restock itself. 570d56daea4SSara Sharon * This function directly moves the allocated RBs to the queue's ownership 571d56daea4SSara Sharon * and updates the relevant counters. 572e705c121SKalle Valo */ 573d56daea4SSara Sharon static void iwl_pcie_rx_allocator_get(struct iwl_trans *trans, 574d56daea4SSara Sharon struct iwl_rxq *rxq) 575e705c121SKalle Valo { 576e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 577e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 578e705c121SKalle Valo int i; 579e705c121SKalle Valo 580d56daea4SSara Sharon lockdep_assert_held(&rxq->lock); 581d56daea4SSara Sharon 582e705c121SKalle Valo /* 583e705c121SKalle Valo * atomic_dec_if_positive returns req_ready - 1 for any scenario. 584e705c121SKalle Valo * If req_ready is 0 atomic_dec_if_positive will return -1 and this 585d56daea4SSara Sharon * function will return early, as there are no ready requests. 586e705c121SKalle Valo * atomic_dec_if_positive will perofrm the *actual* decrement only if 587e705c121SKalle Valo * req_ready > 0, i.e. - there are ready requests and the function 588e705c121SKalle Valo * hands one request to the caller. 589e705c121SKalle Valo */ 590e705c121SKalle Valo if (atomic_dec_if_positive(&rba->req_ready) < 0) 591d56daea4SSara Sharon return; 592e705c121SKalle Valo 593e705c121SKalle Valo spin_lock(&rba->lock); 594e705c121SKalle Valo for (i = 0; i < RX_CLAIM_REQ_ALLOC; i++) { 595e705c121SKalle Valo /* Get next free Rx buffer, remove it from free list */ 596d56daea4SSara Sharon struct iwl_rx_mem_buffer *rxb = 597d56daea4SSara Sharon list_first_entry(&rba->rbd_allocated, 598e705c121SKalle Valo struct iwl_rx_mem_buffer, list); 599d56daea4SSara Sharon 600d56daea4SSara Sharon list_move(&rxb->list, &rxq->rx_free); 601e705c121SKalle Valo } 602e705c121SKalle Valo spin_unlock(&rba->lock); 603e705c121SKalle Valo 604d56daea4SSara Sharon rxq->used_count -= RX_CLAIM_REQ_ALLOC; 605d56daea4SSara Sharon rxq->free_count += RX_CLAIM_REQ_ALLOC; 606e705c121SKalle Valo } 607e705c121SKalle Valo 608e705c121SKalle Valo static void iwl_pcie_rx_allocator_work(struct work_struct *data) 609e705c121SKalle Valo { 610e705c121SKalle Valo struct iwl_rb_allocator *rba_p = 611e705c121SKalle Valo container_of(data, struct iwl_rb_allocator, rx_alloc); 612e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = 613e705c121SKalle Valo container_of(rba_p, struct iwl_trans_pcie, rba); 614e705c121SKalle Valo 615e705c121SKalle Valo iwl_pcie_rx_allocator(trans_pcie->trans); 616e705c121SKalle Valo } 617e705c121SKalle Valo 618e705c121SKalle Valo static int iwl_pcie_rx_alloc(struct iwl_trans *trans) 619e705c121SKalle Valo { 620e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 621e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 622e705c121SKalle Valo struct device *dev = trans->dev; 62378485054SSara Sharon int i; 62496a6497bSSara Sharon int free_size = trans->cfg->mq_rx_supported ? sizeof(__le64) : 62596a6497bSSara Sharon sizeof(__le32); 626e705c121SKalle Valo 62778485054SSara Sharon if (WARN_ON(trans_pcie->rxq)) 628e705c121SKalle Valo return -EINVAL; 629e705c121SKalle Valo 63078485054SSara Sharon trans_pcie->rxq = kcalloc(trans->num_rx_queues, sizeof(struct iwl_rxq), 63178485054SSara Sharon GFP_KERNEL); 63278485054SSara Sharon if (!trans_pcie->rxq) 63378485054SSara Sharon return -EINVAL; 63478485054SSara Sharon 63578485054SSara Sharon spin_lock_init(&rba->lock); 63678485054SSara Sharon 63778485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 63878485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 63978485054SSara Sharon 64078485054SSara Sharon spin_lock_init(&rxq->lock); 64196a6497bSSara Sharon if (trans->cfg->mq_rx_supported) 64296a6497bSSara Sharon rxq->queue_size = MQ_RX_TABLE_SIZE; 64396a6497bSSara Sharon else 64496a6497bSSara Sharon rxq->queue_size = RX_QUEUE_SIZE; 64596a6497bSSara Sharon 64678485054SSara Sharon /* 64778485054SSara Sharon * Allocate the circular buffer of Read Buffer Descriptors 64878485054SSara Sharon * (RBDs) 64978485054SSara Sharon */ 65078485054SSara Sharon rxq->bd = dma_zalloc_coherent(dev, 65196a6497bSSara Sharon free_size * rxq->queue_size, 652e705c121SKalle Valo &rxq->bd_dma, GFP_KERNEL); 653e705c121SKalle Valo if (!rxq->bd) 65478485054SSara Sharon goto err; 65578485054SSara Sharon 65696a6497bSSara Sharon if (trans->cfg->mq_rx_supported) { 65796a6497bSSara Sharon rxq->used_bd = dma_zalloc_coherent(dev, 65896a6497bSSara Sharon sizeof(__le32) * 65996a6497bSSara Sharon rxq->queue_size, 66096a6497bSSara Sharon &rxq->used_bd_dma, 66196a6497bSSara Sharon GFP_KERNEL); 66296a6497bSSara Sharon if (!rxq->used_bd) 66396a6497bSSara Sharon goto err; 66496a6497bSSara Sharon } 665e705c121SKalle Valo 666e705c121SKalle Valo /*Allocate the driver's pointer to receive buffer status */ 667e705c121SKalle Valo rxq->rb_stts = dma_zalloc_coherent(dev, sizeof(*rxq->rb_stts), 66878485054SSara Sharon &rxq->rb_stts_dma, 66978485054SSara Sharon GFP_KERNEL); 670e705c121SKalle Valo if (!rxq->rb_stts) 67178485054SSara Sharon goto err; 67278485054SSara Sharon } 673e705c121SKalle Valo return 0; 674e705c121SKalle Valo 67578485054SSara Sharon err: 67678485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 67778485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 67878485054SSara Sharon 67978485054SSara Sharon if (rxq->bd) 68096a6497bSSara Sharon dma_free_coherent(dev, free_size * rxq->queue_size, 681e705c121SKalle Valo rxq->bd, rxq->bd_dma); 682e705c121SKalle Valo rxq->bd_dma = 0; 683e705c121SKalle Valo rxq->bd = NULL; 68478485054SSara Sharon 68578485054SSara Sharon if (rxq->rb_stts) 68678485054SSara Sharon dma_free_coherent(trans->dev, 68778485054SSara Sharon sizeof(struct iwl_rb_status), 68878485054SSara Sharon rxq->rb_stts, rxq->rb_stts_dma); 68996a6497bSSara Sharon 69096a6497bSSara Sharon if (rxq->used_bd) 69196a6497bSSara Sharon dma_free_coherent(dev, sizeof(__le32) * rxq->queue_size, 69296a6497bSSara Sharon rxq->used_bd, rxq->used_bd_dma); 69396a6497bSSara Sharon rxq->used_bd_dma = 0; 69496a6497bSSara Sharon rxq->used_bd = NULL; 69578485054SSara Sharon } 69678485054SSara Sharon kfree(trans_pcie->rxq); 69796a6497bSSara Sharon 698e705c121SKalle Valo return -ENOMEM; 699e705c121SKalle Valo } 700e705c121SKalle Valo 701e705c121SKalle Valo static void iwl_pcie_rx_hw_init(struct iwl_trans *trans, struct iwl_rxq *rxq) 702e705c121SKalle Valo { 703e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 704e705c121SKalle Valo u32 rb_size; 705dfcfeef9SSara Sharon unsigned long flags; 706e705c121SKalle Valo const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */ 707e705c121SKalle Valo 7086c4fbcbcSEmmanuel Grumbach switch (trans_pcie->rx_buf_size) { 7096c4fbcbcSEmmanuel Grumbach case IWL_AMSDU_4K: 710e705c121SKalle Valo rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K; 7116c4fbcbcSEmmanuel Grumbach break; 7126c4fbcbcSEmmanuel Grumbach case IWL_AMSDU_8K: 7136c4fbcbcSEmmanuel Grumbach rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K; 7146c4fbcbcSEmmanuel Grumbach break; 7156c4fbcbcSEmmanuel Grumbach case IWL_AMSDU_12K: 7166c4fbcbcSEmmanuel Grumbach rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_12K; 7176c4fbcbcSEmmanuel Grumbach break; 7186c4fbcbcSEmmanuel Grumbach default: 7196c4fbcbcSEmmanuel Grumbach WARN_ON(1); 7206c4fbcbcSEmmanuel Grumbach rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K; 7216c4fbcbcSEmmanuel Grumbach } 722e705c121SKalle Valo 723dfcfeef9SSara Sharon if (!iwl_trans_grab_nic_access(trans, &flags)) 724dfcfeef9SSara Sharon return; 725dfcfeef9SSara Sharon 726e705c121SKalle Valo /* Stop Rx DMA */ 727dfcfeef9SSara Sharon iwl_write32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0); 728e705c121SKalle Valo /* reset and flush pointers */ 729dfcfeef9SSara Sharon iwl_write32(trans, FH_MEM_RCSR_CHNL0_RBDCB_WPTR, 0); 730dfcfeef9SSara Sharon iwl_write32(trans, FH_MEM_RCSR_CHNL0_FLUSH_RB_REQ, 0); 731dfcfeef9SSara Sharon iwl_write32(trans, FH_RSCSR_CHNL0_RDPTR, 0); 732e705c121SKalle Valo 733e705c121SKalle Valo /* Reset driver's Rx queue write index */ 734dfcfeef9SSara Sharon iwl_write32(trans, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0); 735e705c121SKalle Valo 736e705c121SKalle Valo /* Tell device where to find RBD circular buffer in DRAM */ 737dfcfeef9SSara Sharon iwl_write32(trans, FH_RSCSR_CHNL0_RBDCB_BASE_REG, 738e705c121SKalle Valo (u32)(rxq->bd_dma >> 8)); 739e705c121SKalle Valo 740e705c121SKalle Valo /* Tell device where in DRAM to update its Rx status */ 741dfcfeef9SSara Sharon iwl_write32(trans, FH_RSCSR_CHNL0_STTS_WPTR_REG, 742e705c121SKalle Valo rxq->rb_stts_dma >> 4); 743e705c121SKalle Valo 744e705c121SKalle Valo /* Enable Rx DMA 745e705c121SKalle Valo * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in 746e705c121SKalle Valo * the credit mechanism in 5000 HW RX FIFO 747e705c121SKalle Valo * Direct rx interrupts to hosts 7486c4fbcbcSEmmanuel Grumbach * Rx buffer size 4 or 8k or 12k 749e705c121SKalle Valo * RB timeout 0x10 750e705c121SKalle Valo * 256 RBDs 751e705c121SKalle Valo */ 752dfcfeef9SSara Sharon iwl_write32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 753e705c121SKalle Valo FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL | 754e705c121SKalle Valo FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY | 755e705c121SKalle Valo FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL | 756e705c121SKalle Valo rb_size | 757e705c121SKalle Valo (RX_RB_TIMEOUT << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS) | 758e705c121SKalle Valo (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS)); 759e705c121SKalle Valo 760dfcfeef9SSara Sharon iwl_trans_release_nic_access(trans, &flags); 761dfcfeef9SSara Sharon 762e705c121SKalle Valo /* Set interrupt coalescing timer to default (2048 usecs) */ 763e705c121SKalle Valo iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF); 764e705c121SKalle Valo 765e705c121SKalle Valo /* W/A for interrupt coalescing bug in 7260 and 3160 */ 766e705c121SKalle Valo if (trans->cfg->host_interrupt_operation_mode) 767e705c121SKalle Valo iwl_set_bit(trans, CSR_INT_COALESCING, IWL_HOST_INT_OPER_MODE); 768e705c121SKalle Valo } 769e705c121SKalle Valo 7701316d595SSara Sharon void iwl_pcie_enable_rx_wake(struct iwl_trans *trans, bool enable) 7711316d595SSara Sharon { 7721316d595SSara Sharon /* 7731316d595SSara Sharon * Turn on the chicken-bits that cause MAC wakeup for RX-related 7741316d595SSara Sharon * values. 7751316d595SSara Sharon * This costs some power, but needed for W/A 9000 integrated A-step 7761316d595SSara Sharon * bug where shadow registers are not in the retention list and their 7771316d595SSara Sharon * value is lost when NIC powers down 7781316d595SSara Sharon */ 7791316d595SSara Sharon if (trans->cfg->integrated) { 7801316d595SSara Sharon iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 7811316d595SSara Sharon CSR_MAC_SHADOW_REG_CTRL_RX_WAKE); 7821316d595SSara Sharon iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTL2, 7831316d595SSara Sharon CSR_MAC_SHADOW_REG_CTL2_RX_WAKE); 7841316d595SSara Sharon } 7851316d595SSara Sharon } 7861316d595SSara Sharon 787bce97731SSara Sharon static void iwl_pcie_rx_mq_hw_init(struct iwl_trans *trans) 78896a6497bSSara Sharon { 78996a6497bSSara Sharon struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 79096a6497bSSara Sharon u32 rb_size, enabled = 0; 791dfcfeef9SSara Sharon unsigned long flags; 79296a6497bSSara Sharon int i; 79396a6497bSSara Sharon 79496a6497bSSara Sharon switch (trans_pcie->rx_buf_size) { 79596a6497bSSara Sharon case IWL_AMSDU_4K: 79696a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_4K; 79796a6497bSSara Sharon break; 79896a6497bSSara Sharon case IWL_AMSDU_8K: 79996a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_8K; 80096a6497bSSara Sharon break; 80196a6497bSSara Sharon case IWL_AMSDU_12K: 80296a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_12K; 80396a6497bSSara Sharon break; 80496a6497bSSara Sharon default: 80596a6497bSSara Sharon WARN_ON(1); 80696a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_4K; 80796a6497bSSara Sharon } 80896a6497bSSara Sharon 809dfcfeef9SSara Sharon if (!iwl_trans_grab_nic_access(trans, &flags)) 810dfcfeef9SSara Sharon return; 811dfcfeef9SSara Sharon 81296a6497bSSara Sharon /* Stop Rx DMA */ 813dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_RXF_DMA_CFG, 0); 81496a6497bSSara Sharon /* disable free amd used rx queue operation */ 815dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_RXF_RXQ_ACTIVE, 0); 81696a6497bSSara Sharon 81796a6497bSSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 81896a6497bSSara Sharon /* Tell device where to find RBD free table in DRAM */ 819dfcfeef9SSara Sharon iwl_pcie_write_prph_64_no_grab(trans, 820dfcfeef9SSara Sharon RFH_Q_FRBDCB_BA_LSB(i), 821dfcfeef9SSara Sharon trans_pcie->rxq[i].bd_dma); 82296a6497bSSara Sharon /* Tell device where to find RBD used table in DRAM */ 823dfcfeef9SSara Sharon iwl_pcie_write_prph_64_no_grab(trans, 824dfcfeef9SSara Sharon RFH_Q_URBDCB_BA_LSB(i), 825dfcfeef9SSara Sharon trans_pcie->rxq[i].used_bd_dma); 82696a6497bSSara Sharon /* Tell device where in DRAM to update its Rx status */ 827dfcfeef9SSara Sharon iwl_pcie_write_prph_64_no_grab(trans, 828dfcfeef9SSara Sharon RFH_Q_URBD_STTS_WPTR_LSB(i), 829bce97731SSara Sharon trans_pcie->rxq[i].rb_stts_dma); 83096a6497bSSara Sharon /* Reset device indice tables */ 831dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_Q_FRBDCB_WIDX(i), 0); 832dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_Q_FRBDCB_RIDX(i), 0); 833dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_Q_URBDCB_WIDX(i), 0); 83496a6497bSSara Sharon 83596a6497bSSara Sharon enabled |= BIT(i) | BIT(i + 16); 83696a6497bSSara Sharon } 83796a6497bSSara Sharon 83896a6497bSSara Sharon /* 83996a6497bSSara Sharon * Enable Rx DMA 84096a6497bSSara Sharon * Rx buffer size 4 or 8k or 12k 84196a6497bSSara Sharon * Min RB size 4 or 8 84288076015SSara Sharon * Drop frames that exceed RB size 84396a6497bSSara Sharon * 512 RBDs 84496a6497bSSara Sharon */ 845dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_RXF_DMA_CFG, 84663044335SSara Sharon RFH_DMA_EN_ENABLE_VAL | rb_size | 84796a6497bSSara Sharon RFH_RXF_DMA_MIN_RB_4_8 | 84888076015SSara Sharon RFH_RXF_DMA_DROP_TOO_LARGE_MASK | 84996a6497bSSara Sharon RFH_RXF_DMA_RBDCB_SIZE_512); 85096a6497bSSara Sharon 85188076015SSara Sharon /* 85288076015SSara Sharon * Activate DMA snooping. 853b0262f07SSara Sharon * Set RX DMA chunk size to 64B for IOSF and 128B for PCIe 85488076015SSara Sharon * Default queue is 0 85588076015SSara Sharon */ 856dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_GEN_CFG, RFH_GEN_CFG_RFH_DMA_SNOOP | 857dfcfeef9SSara Sharon (DEFAULT_RXQ_NUM << 858dfcfeef9SSara Sharon RFH_GEN_CFG_DEFAULT_RXQ_NUM_POS) | 859b0262f07SSara Sharon RFH_GEN_CFG_SERVICE_DMA_SNOOP | 860b0262f07SSara Sharon (trans->cfg->integrated ? 861b0262f07SSara Sharon RFH_GEN_CFG_RB_CHUNK_SIZE_64 : 862b0262f07SSara Sharon RFH_GEN_CFG_RB_CHUNK_SIZE_128) << 863b0262f07SSara Sharon RFH_GEN_CFG_RB_CHUNK_SIZE_POS); 86488076015SSara Sharon /* Enable the relevant rx queues */ 865dfcfeef9SSara Sharon iwl_write_prph_no_grab(trans, RFH_RXF_RXQ_ACTIVE, enabled); 866dfcfeef9SSara Sharon 867dfcfeef9SSara Sharon iwl_trans_release_nic_access(trans, &flags); 86896a6497bSSara Sharon 86996a6497bSSara Sharon /* Set interrupt coalescing timer to default (2048 usecs) */ 87096a6497bSSara Sharon iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF); 8711316d595SSara Sharon 8721316d595SSara Sharon iwl_pcie_enable_rx_wake(trans, true); 87396a6497bSSara Sharon } 87496a6497bSSara Sharon 875e705c121SKalle Valo static void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq) 876e705c121SKalle Valo { 877e705c121SKalle Valo lockdep_assert_held(&rxq->lock); 878e705c121SKalle Valo 879e705c121SKalle Valo INIT_LIST_HEAD(&rxq->rx_free); 880e705c121SKalle Valo INIT_LIST_HEAD(&rxq->rx_used); 881e705c121SKalle Valo rxq->free_count = 0; 882e705c121SKalle Valo rxq->used_count = 0; 883e705c121SKalle Valo } 884e705c121SKalle Valo 885bce97731SSara Sharon static int iwl_pcie_dummy_napi_poll(struct napi_struct *napi, int budget) 886bce97731SSara Sharon { 887bce97731SSara Sharon WARN_ON(1); 888bce97731SSara Sharon return 0; 889bce97731SSara Sharon } 890bce97731SSara Sharon 891e705c121SKalle Valo int iwl_pcie_rx_init(struct iwl_trans *trans) 892e705c121SKalle Valo { 893e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 89478485054SSara Sharon struct iwl_rxq *def_rxq; 895e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 8967b542436SSara Sharon int i, err, queue_size, allocator_pool_size, num_alloc; 897e705c121SKalle Valo 89878485054SSara Sharon if (!trans_pcie->rxq) { 899e705c121SKalle Valo err = iwl_pcie_rx_alloc(trans); 900e705c121SKalle Valo if (err) 901e705c121SKalle Valo return err; 902e705c121SKalle Valo } 90378485054SSara Sharon def_rxq = trans_pcie->rxq; 904e705c121SKalle Valo if (!rba->alloc_wq) 905e705c121SKalle Valo rba->alloc_wq = alloc_workqueue("rb_allocator", 906e705c121SKalle Valo WQ_HIGHPRI | WQ_UNBOUND, 1); 907e705c121SKalle Valo INIT_WORK(&rba->rx_alloc, iwl_pcie_rx_allocator_work); 908e705c121SKalle Valo 909e705c121SKalle Valo spin_lock(&rba->lock); 910e705c121SKalle Valo atomic_set(&rba->req_pending, 0); 911e705c121SKalle Valo atomic_set(&rba->req_ready, 0); 91296a6497bSSara Sharon INIT_LIST_HEAD(&rba->rbd_allocated); 91396a6497bSSara Sharon INIT_LIST_HEAD(&rba->rbd_empty); 914e705c121SKalle Valo spin_unlock(&rba->lock); 915e705c121SKalle Valo 916e705c121SKalle Valo /* free all first - we might be reconfigured for a different size */ 91778485054SSara Sharon iwl_pcie_free_rbs_pool(trans); 918e705c121SKalle Valo 919e705c121SKalle Valo for (i = 0; i < RX_QUEUE_SIZE; i++) 92078485054SSara Sharon def_rxq->queue[i] = NULL; 921e705c121SKalle Valo 92278485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 92378485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 924e705c121SKalle Valo 92596a6497bSSara Sharon rxq->id = i; 92696a6497bSSara Sharon 927e705c121SKalle Valo spin_lock(&rxq->lock); 92878485054SSara Sharon /* 92978485054SSara Sharon * Set read write pointer to reflect that we have processed 93078485054SSara Sharon * and used all buffers, but have not restocked the Rx queue 93178485054SSara Sharon * with fresh buffers 93278485054SSara Sharon */ 93378485054SSara Sharon rxq->read = 0; 93478485054SSara Sharon rxq->write = 0; 93578485054SSara Sharon rxq->write_actual = 0; 93678485054SSara Sharon memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts)); 93778485054SSara Sharon 93878485054SSara Sharon iwl_pcie_rx_init_rxb_lists(rxq); 93978485054SSara Sharon 940bce97731SSara Sharon if (!rxq->napi.poll) 941bce97731SSara Sharon netif_napi_add(&trans_pcie->napi_dev, &rxq->napi, 942bce97731SSara Sharon iwl_pcie_dummy_napi_poll, 64); 943bce97731SSara Sharon 944e705c121SKalle Valo spin_unlock(&rxq->lock); 94578485054SSara Sharon } 94678485054SSara Sharon 94796a6497bSSara Sharon /* move the pool to the default queue and allocator ownerships */ 9487b542436SSara Sharon queue_size = trans->cfg->mq_rx_supported ? 9497b542436SSara Sharon MQ_RX_NUM_RBDS : RX_QUEUE_SIZE; 95096a6497bSSara Sharon allocator_pool_size = trans->num_rx_queues * 95196a6497bSSara Sharon (RX_CLAIM_REQ_ALLOC - RX_POST_REQ_ALLOC); 9527b542436SSara Sharon num_alloc = queue_size + allocator_pool_size; 95343146925SSara Sharon BUILD_BUG_ON(ARRAY_SIZE(trans_pcie->global_table) != 95443146925SSara Sharon ARRAY_SIZE(trans_pcie->rx_pool)); 9557b542436SSara Sharon for (i = 0; i < num_alloc; i++) { 95696a6497bSSara Sharon struct iwl_rx_mem_buffer *rxb = &trans_pcie->rx_pool[i]; 95796a6497bSSara Sharon 95896a6497bSSara Sharon if (i < allocator_pool_size) 95996a6497bSSara Sharon list_add(&rxb->list, &rba->rbd_empty); 96096a6497bSSara Sharon else 96196a6497bSSara Sharon list_add(&rxb->list, &def_rxq->rx_used); 96296a6497bSSara Sharon trans_pcie->global_table[i] = rxb; 963e25d65f2SSara Sharon rxb->vid = (u16)(i + 1); 96496a6497bSSara Sharon } 96578485054SSara Sharon 96678485054SSara Sharon iwl_pcie_rxq_alloc_rbs(trans, GFP_KERNEL, def_rxq); 9672047fa54SSara Sharon 9682047fa54SSara Sharon if (trans->cfg->mq_rx_supported) 969bce97731SSara Sharon iwl_pcie_rx_mq_hw_init(trans); 9702047fa54SSara Sharon else 97178485054SSara Sharon iwl_pcie_rx_hw_init(trans, def_rxq); 9722047fa54SSara Sharon 9732047fa54SSara Sharon iwl_pcie_rxq_restock(trans, def_rxq); 97478485054SSara Sharon 97578485054SSara Sharon spin_lock(&def_rxq->lock); 97678485054SSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, def_rxq); 97778485054SSara Sharon spin_unlock(&def_rxq->lock); 978e705c121SKalle Valo 979e705c121SKalle Valo return 0; 980e705c121SKalle Valo } 981e705c121SKalle Valo 982e705c121SKalle Valo void iwl_pcie_rx_free(struct iwl_trans *trans) 983e705c121SKalle Valo { 984e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 985e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 98696a6497bSSara Sharon int free_size = trans->cfg->mq_rx_supported ? sizeof(__le64) : 98796a6497bSSara Sharon sizeof(__le32); 98878485054SSara Sharon int i; 989e705c121SKalle Valo 99078485054SSara Sharon /* 99178485054SSara Sharon * if rxq is NULL, it means that nothing has been allocated, 99278485054SSara Sharon * exit now 99378485054SSara Sharon */ 99478485054SSara Sharon if (!trans_pcie->rxq) { 995e705c121SKalle Valo IWL_DEBUG_INFO(trans, "Free NULL rx context\n"); 996e705c121SKalle Valo return; 997e705c121SKalle Valo } 998e705c121SKalle Valo 999e705c121SKalle Valo cancel_work_sync(&rba->rx_alloc); 1000e705c121SKalle Valo if (rba->alloc_wq) { 1001e705c121SKalle Valo destroy_workqueue(rba->alloc_wq); 1002e705c121SKalle Valo rba->alloc_wq = NULL; 1003e705c121SKalle Valo } 1004e705c121SKalle Valo 100578485054SSara Sharon iwl_pcie_free_rbs_pool(trans); 1006e705c121SKalle Valo 100778485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 100878485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 100978485054SSara Sharon 101078485054SSara Sharon if (rxq->bd) 101178485054SSara Sharon dma_free_coherent(trans->dev, 101296a6497bSSara Sharon free_size * rxq->queue_size, 1013e705c121SKalle Valo rxq->bd, rxq->bd_dma); 1014e705c121SKalle Valo rxq->bd_dma = 0; 1015e705c121SKalle Valo rxq->bd = NULL; 1016e705c121SKalle Valo 1017e705c121SKalle Valo if (rxq->rb_stts) 1018e705c121SKalle Valo dma_free_coherent(trans->dev, 1019e705c121SKalle Valo sizeof(struct iwl_rb_status), 1020e705c121SKalle Valo rxq->rb_stts, rxq->rb_stts_dma); 1021e705c121SKalle Valo else 102278485054SSara Sharon IWL_DEBUG_INFO(trans, 102378485054SSara Sharon "Free rxq->rb_stts which is NULL\n"); 102478485054SSara Sharon 102596a6497bSSara Sharon if (rxq->used_bd) 102696a6497bSSara Sharon dma_free_coherent(trans->dev, 102796a6497bSSara Sharon sizeof(__le32) * rxq->queue_size, 102896a6497bSSara Sharon rxq->used_bd, rxq->used_bd_dma); 102996a6497bSSara Sharon rxq->used_bd_dma = 0; 103096a6497bSSara Sharon rxq->used_bd = NULL; 1031bce97731SSara Sharon 1032bce97731SSara Sharon if (rxq->napi.poll) 1033bce97731SSara Sharon netif_napi_del(&rxq->napi); 103496a6497bSSara Sharon } 103578485054SSara Sharon kfree(trans_pcie->rxq); 1036e705c121SKalle Valo } 1037e705c121SKalle Valo 1038e705c121SKalle Valo /* 1039e705c121SKalle Valo * iwl_pcie_rx_reuse_rbd - Recycle used RBDs 1040e705c121SKalle Valo * 1041e705c121SKalle Valo * Called when a RBD can be reused. The RBD is transferred to the allocator. 1042e705c121SKalle Valo * When there are 2 empty RBDs - a request for allocation is posted 1043e705c121SKalle Valo */ 1044e705c121SKalle Valo static void iwl_pcie_rx_reuse_rbd(struct iwl_trans *trans, 1045e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb, 1046e705c121SKalle Valo struct iwl_rxq *rxq, bool emergency) 1047e705c121SKalle Valo { 1048e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1049e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 1050e705c121SKalle Valo 1051e705c121SKalle Valo /* Move the RBD to the used list, will be moved to allocator in batches 1052e705c121SKalle Valo * before claiming or posting a request*/ 1053e705c121SKalle Valo list_add_tail(&rxb->list, &rxq->rx_used); 1054e705c121SKalle Valo 1055e705c121SKalle Valo if (unlikely(emergency)) 1056e705c121SKalle Valo return; 1057e705c121SKalle Valo 1058e705c121SKalle Valo /* Count the allocator owned RBDs */ 1059e705c121SKalle Valo rxq->used_count++; 1060e705c121SKalle Valo 1061e705c121SKalle Valo /* If we have RX_POST_REQ_ALLOC new released rx buffers - 1062e705c121SKalle Valo * issue a request for allocator. Modulo RX_CLAIM_REQ_ALLOC is 1063e705c121SKalle Valo * used for the case we failed to claim RX_CLAIM_REQ_ALLOC, 1064e705c121SKalle Valo * after but we still need to post another request. 1065e705c121SKalle Valo */ 1066e705c121SKalle Valo if ((rxq->used_count % RX_CLAIM_REQ_ALLOC) == RX_POST_REQ_ALLOC) { 1067e705c121SKalle Valo /* Move the 2 RBDs to the allocator ownership. 1068e705c121SKalle Valo Allocator has another 6 from pool for the request completion*/ 1069e705c121SKalle Valo spin_lock(&rba->lock); 1070e705c121SKalle Valo list_splice_tail_init(&rxq->rx_used, &rba->rbd_empty); 1071e705c121SKalle Valo spin_unlock(&rba->lock); 1072e705c121SKalle Valo 1073e705c121SKalle Valo atomic_inc(&rba->req_pending); 1074e705c121SKalle Valo queue_work(rba->alloc_wq, &rba->rx_alloc); 1075e705c121SKalle Valo } 1076e705c121SKalle Valo } 1077e705c121SKalle Valo 1078e705c121SKalle Valo static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans, 107978485054SSara Sharon struct iwl_rxq *rxq, 1080e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb, 1081e705c121SKalle Valo bool emergency) 1082e705c121SKalle Valo { 1083e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1084e705c121SKalle Valo struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; 1085e705c121SKalle Valo bool page_stolen = false; 1086e705c121SKalle Valo int max_len = PAGE_SIZE << trans_pcie->rx_page_order; 1087e705c121SKalle Valo u32 offset = 0; 1088e705c121SKalle Valo 1089e705c121SKalle Valo if (WARN_ON(!rxb)) 1090e705c121SKalle Valo return; 1091e705c121SKalle Valo 1092e705c121SKalle Valo dma_unmap_page(trans->dev, rxb->page_dma, max_len, DMA_FROM_DEVICE); 1093e705c121SKalle Valo 1094e705c121SKalle Valo while (offset + sizeof(u32) + sizeof(struct iwl_cmd_header) < max_len) { 1095e705c121SKalle Valo struct iwl_rx_packet *pkt; 1096e705c121SKalle Valo u16 sequence; 1097e705c121SKalle Valo bool reclaim; 1098e705c121SKalle Valo int index, cmd_index, len; 1099e705c121SKalle Valo struct iwl_rx_cmd_buffer rxcb = { 1100e705c121SKalle Valo ._offset = offset, 1101e705c121SKalle Valo ._rx_page_order = trans_pcie->rx_page_order, 1102e705c121SKalle Valo ._page = rxb->page, 1103e705c121SKalle Valo ._page_stolen = false, 1104e705c121SKalle Valo .truesize = max_len, 1105e705c121SKalle Valo }; 1106e705c121SKalle Valo 1107e705c121SKalle Valo pkt = rxb_addr(&rxcb); 1108e705c121SKalle Valo 1109e705c121SKalle Valo if (pkt->len_n_flags == cpu_to_le32(FH_RSCSR_FRAME_INVALID)) 1110e705c121SKalle Valo break; 1111e705c121SKalle Valo 1112ab2e696bSSara Sharon WARN_ON((le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_RXQ_MASK) >> 1113ab2e696bSSara Sharon FH_RSCSR_RXQ_POS != rxq->id); 1114ab2e696bSSara Sharon 1115e705c121SKalle Valo IWL_DEBUG_RX(trans, 1116e705c121SKalle Valo "cmd at offset %d: %s (0x%.2x, seq 0x%x)\n", 1117e705c121SKalle Valo rxcb._offset, 111839bdb17eSSharon Dvir iwl_get_cmd_string(trans, 111939bdb17eSSharon Dvir iwl_cmd_id(pkt->hdr.cmd, 112039bdb17eSSharon Dvir pkt->hdr.group_id, 112139bdb17eSSharon Dvir 0)), 1122e705c121SKalle Valo pkt->hdr.cmd, le16_to_cpu(pkt->hdr.sequence)); 1123e705c121SKalle Valo 1124e705c121SKalle Valo len = iwl_rx_packet_len(pkt); 1125e705c121SKalle Valo len += sizeof(u32); /* account for status word */ 1126e705c121SKalle Valo trace_iwlwifi_dev_rx(trans->dev, trans, pkt, len); 1127e705c121SKalle Valo trace_iwlwifi_dev_rx_data(trans->dev, trans, pkt, len); 1128e705c121SKalle Valo 1129e705c121SKalle Valo /* Reclaim a command buffer only if this packet is a response 1130e705c121SKalle Valo * to a (driver-originated) command. 1131e705c121SKalle Valo * If the packet (e.g. Rx frame) originated from uCode, 1132e705c121SKalle Valo * there is no command buffer to reclaim. 1133e705c121SKalle Valo * Ucode should set SEQ_RX_FRAME bit if ucode-originated, 1134e705c121SKalle Valo * but apparently a few don't get set; catch them here. */ 1135e705c121SKalle Valo reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME); 1136e705c121SKalle Valo if (reclaim) { 1137e705c121SKalle Valo int i; 1138e705c121SKalle Valo 1139e705c121SKalle Valo for (i = 0; i < trans_pcie->n_no_reclaim_cmds; i++) { 1140e705c121SKalle Valo if (trans_pcie->no_reclaim_cmds[i] == 1141e705c121SKalle Valo pkt->hdr.cmd) { 1142e705c121SKalle Valo reclaim = false; 1143e705c121SKalle Valo break; 1144e705c121SKalle Valo } 1145e705c121SKalle Valo } 1146e705c121SKalle Valo } 1147e705c121SKalle Valo 1148e705c121SKalle Valo sequence = le16_to_cpu(pkt->hdr.sequence); 1149e705c121SKalle Valo index = SEQ_TO_INDEX(sequence); 1150e705c121SKalle Valo cmd_index = get_cmd_index(&txq->q, index); 1151e705c121SKalle Valo 1152bce97731SSara Sharon if (rxq->id == 0) 1153bce97731SSara Sharon iwl_op_mode_rx(trans->op_mode, &rxq->napi, 1154bce97731SSara Sharon &rxcb); 1155bce97731SSara Sharon else 1156bce97731SSara Sharon iwl_op_mode_rx_rss(trans->op_mode, &rxq->napi, 1157bce97731SSara Sharon &rxcb, rxq->id); 1158e705c121SKalle Valo 1159e705c121SKalle Valo if (reclaim) { 1160e705c121SKalle Valo kzfree(txq->entries[cmd_index].free_buf); 1161e705c121SKalle Valo txq->entries[cmd_index].free_buf = NULL; 1162e705c121SKalle Valo } 1163e705c121SKalle Valo 1164e705c121SKalle Valo /* 1165e705c121SKalle Valo * After here, we should always check rxcb._page_stolen, 1166e705c121SKalle Valo * if it is true then one of the handlers took the page. 1167e705c121SKalle Valo */ 1168e705c121SKalle Valo 1169e705c121SKalle Valo if (reclaim) { 1170e705c121SKalle Valo /* Invoke any callbacks, transfer the buffer to caller, 1171e705c121SKalle Valo * and fire off the (possibly) blocking 1172e705c121SKalle Valo * iwl_trans_send_cmd() 1173e705c121SKalle Valo * as we reclaim the driver command queue */ 1174e705c121SKalle Valo if (!rxcb._page_stolen) 1175e705c121SKalle Valo iwl_pcie_hcmd_complete(trans, &rxcb); 1176e705c121SKalle Valo else 1177e705c121SKalle Valo IWL_WARN(trans, "Claim null rxb?\n"); 1178e705c121SKalle Valo } 1179e705c121SKalle Valo 1180e705c121SKalle Valo page_stolen |= rxcb._page_stolen; 1181e705c121SKalle Valo offset += ALIGN(len, FH_RSCSR_FRAME_ALIGN); 1182e705c121SKalle Valo } 1183e705c121SKalle Valo 1184e705c121SKalle Valo /* page was stolen from us -- free our reference */ 1185e705c121SKalle Valo if (page_stolen) { 1186e705c121SKalle Valo __free_pages(rxb->page, trans_pcie->rx_page_order); 1187e705c121SKalle Valo rxb->page = NULL; 1188e705c121SKalle Valo } 1189e705c121SKalle Valo 1190e705c121SKalle Valo /* Reuse the page if possible. For notification packets and 1191e705c121SKalle Valo * SKBs that fail to Rx correctly, add them back into the 1192e705c121SKalle Valo * rx_free list for reuse later. */ 1193e705c121SKalle Valo if (rxb->page != NULL) { 1194e705c121SKalle Valo rxb->page_dma = 1195e705c121SKalle Valo dma_map_page(trans->dev, rxb->page, 0, 1196e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 1197e705c121SKalle Valo DMA_FROM_DEVICE); 1198e705c121SKalle Valo if (dma_mapping_error(trans->dev, rxb->page_dma)) { 1199e705c121SKalle Valo /* 1200e705c121SKalle Valo * free the page(s) as well to not break 1201e705c121SKalle Valo * the invariant that the items on the used 1202e705c121SKalle Valo * list have no page(s) 1203e705c121SKalle Valo */ 1204e705c121SKalle Valo __free_pages(rxb->page, trans_pcie->rx_page_order); 1205e705c121SKalle Valo rxb->page = NULL; 1206e705c121SKalle Valo iwl_pcie_rx_reuse_rbd(trans, rxb, rxq, emergency); 1207e705c121SKalle Valo } else { 1208e705c121SKalle Valo list_add_tail(&rxb->list, &rxq->rx_free); 1209e705c121SKalle Valo rxq->free_count++; 1210e705c121SKalle Valo } 1211e705c121SKalle Valo } else 1212e705c121SKalle Valo iwl_pcie_rx_reuse_rbd(trans, rxb, rxq, emergency); 1213e705c121SKalle Valo } 1214e705c121SKalle Valo 1215e705c121SKalle Valo /* 1216e705c121SKalle Valo * iwl_pcie_rx_handle - Main entry function for receiving responses from fw 1217e705c121SKalle Valo */ 12182e5d4a8fSHaim Dreyfuss static void iwl_pcie_rx_handle(struct iwl_trans *trans, int queue) 1219e705c121SKalle Valo { 1220e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 12212e5d4a8fSHaim Dreyfuss struct iwl_rxq *rxq = &trans_pcie->rxq[queue]; 1222d56daea4SSara Sharon u32 r, i, count = 0; 1223e705c121SKalle Valo bool emergency = false; 1224e705c121SKalle Valo 1225e705c121SKalle Valo restart: 1226e705c121SKalle Valo spin_lock(&rxq->lock); 1227e705c121SKalle Valo /* uCode's read index (stored in shared DRAM) indicates the last Rx 1228e705c121SKalle Valo * buffer that the driver may process (last buffer filled by ucode). */ 1229e705c121SKalle Valo r = le16_to_cpu(ACCESS_ONCE(rxq->rb_stts->closed_rb_num)) & 0x0FFF; 1230e705c121SKalle Valo i = rxq->read; 1231e705c121SKalle Valo 12325eae443eSSara Sharon /* W/A 9000 device step A0 wrap-around bug */ 12335eae443eSSara Sharon r &= (rxq->queue_size - 1); 12345eae443eSSara Sharon 1235e705c121SKalle Valo /* Rx interrupt, but nothing sent from uCode */ 1236e705c121SKalle Valo if (i == r) 12375eae443eSSara Sharon IWL_DEBUG_RX(trans, "Q %d: HW = SW = %d\n", rxq->id, r); 1238e705c121SKalle Valo 1239e705c121SKalle Valo while (i != r) { 1240e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 1241e705c121SKalle Valo 124296a6497bSSara Sharon if (unlikely(rxq->used_count == rxq->queue_size / 2)) 1243e705c121SKalle Valo emergency = true; 1244e705c121SKalle Valo 124596a6497bSSara Sharon if (trans->cfg->mq_rx_supported) { 124696a6497bSSara Sharon /* 124796a6497bSSara Sharon * used_bd is a 32 bit but only 12 are used to retrieve 124896a6497bSSara Sharon * the vid 124996a6497bSSara Sharon */ 12505eae443eSSara Sharon u16 vid = le32_to_cpu(rxq->used_bd[i]) & 0x0FFF; 125196a6497bSSara Sharon 1252e25d65f2SSara Sharon if (WARN(!vid || 1253e25d65f2SSara Sharon vid > ARRAY_SIZE(trans_pcie->global_table), 1254e25d65f2SSara Sharon "Invalid rxb index from HW %u\n", (u32)vid)) { 1255e25d65f2SSara Sharon iwl_force_nmi(trans); 12565eae443eSSara Sharon goto out; 1257e25d65f2SSara Sharon } 1258e25d65f2SSara Sharon rxb = trans_pcie->global_table[vid - 1]; 125996a6497bSSara Sharon } else { 1260e705c121SKalle Valo rxb = rxq->queue[i]; 1261e705c121SKalle Valo rxq->queue[i] = NULL; 126296a6497bSSara Sharon } 1263e705c121SKalle Valo 12645eae443eSSara Sharon IWL_DEBUG_RX(trans, "Q %d: HW = %d, SW = %d\n", rxq->id, r, i); 126578485054SSara Sharon iwl_pcie_rx_handle_rb(trans, rxq, rxb, emergency); 1266e705c121SKalle Valo 126796a6497bSSara Sharon i = (i + 1) & (rxq->queue_size - 1); 1268e705c121SKalle Valo 1269d56daea4SSara Sharon /* 1270d56daea4SSara Sharon * If we have RX_CLAIM_REQ_ALLOC released rx buffers - 1271d56daea4SSara Sharon * try to claim the pre-allocated buffers from the allocator. 1272d56daea4SSara Sharon * If not ready - will try to reclaim next time. 1273d56daea4SSara Sharon * There is no need to reschedule work - allocator exits only 1274d56daea4SSara Sharon * on success 1275e705c121SKalle Valo */ 1276d56daea4SSara Sharon if (rxq->used_count >= RX_CLAIM_REQ_ALLOC) 1277d56daea4SSara Sharon iwl_pcie_rx_allocator_get(trans, rxq); 1278e705c121SKalle Valo 1279d56daea4SSara Sharon if (rxq->used_count % RX_CLAIM_REQ_ALLOC == 0 && !emergency) { 1280d56daea4SSara Sharon struct iwl_rb_allocator *rba = &trans_pcie->rba; 1281d56daea4SSara Sharon 1282d56daea4SSara Sharon /* Add the remaining empty RBDs for allocator use */ 1283d56daea4SSara Sharon spin_lock(&rba->lock); 1284d56daea4SSara Sharon list_splice_tail_init(&rxq->rx_used, &rba->rbd_empty); 1285d56daea4SSara Sharon spin_unlock(&rba->lock); 1286d56daea4SSara Sharon } else if (emergency) { 1287e705c121SKalle Valo count++; 1288e705c121SKalle Valo if (count == 8) { 1289e705c121SKalle Valo count = 0; 129096a6497bSSara Sharon if (rxq->used_count < rxq->queue_size / 3) 1291e705c121SKalle Valo emergency = false; 1292e0e168dcSGregory Greenman 1293e705c121SKalle Valo rxq->read = i; 1294e705c121SKalle Valo spin_unlock(&rxq->lock); 1295e0e168dcSGregory Greenman iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC, rxq); 129678485054SSara Sharon iwl_pcie_rxq_restock(trans, rxq); 1297e705c121SKalle Valo goto restart; 1298e705c121SKalle Valo } 1299e705c121SKalle Valo } 1300e0e168dcSGregory Greenman } 13015eae443eSSara Sharon out: 1302e705c121SKalle Valo /* Backtrack one entry */ 1303e705c121SKalle Valo rxq->read = i; 1304e705c121SKalle Valo spin_unlock(&rxq->lock); 1305e705c121SKalle Valo 1306e705c121SKalle Valo /* 1307e705c121SKalle Valo * handle a case where in emergency there are some unallocated RBDs. 1308e705c121SKalle Valo * those RBDs are in the used list, but are not tracked by the queue's 1309e705c121SKalle Valo * used_count which counts allocator owned RBDs. 1310e705c121SKalle Valo * unallocated emergency RBDs must be allocated on exit, otherwise 1311e705c121SKalle Valo * when called again the function may not be in emergency mode and 1312e705c121SKalle Valo * they will be handed to the allocator with no tracking in the RBD 1313e705c121SKalle Valo * allocator counters, which will lead to them never being claimed back 1314e705c121SKalle Valo * by the queue. 1315e705c121SKalle Valo * by allocating them here, they are now in the queue free list, and 1316e705c121SKalle Valo * will be restocked by the next call of iwl_pcie_rxq_restock. 1317e705c121SKalle Valo */ 1318e705c121SKalle Valo if (unlikely(emergency && count)) 131978485054SSara Sharon iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC, rxq); 1320e705c121SKalle Valo 1321bce97731SSara Sharon if (rxq->napi.poll) 1322bce97731SSara Sharon napi_gro_flush(&rxq->napi, false); 1323e0e168dcSGregory Greenman 1324e0e168dcSGregory Greenman iwl_pcie_rxq_restock(trans, rxq); 1325e705c121SKalle Valo } 1326e705c121SKalle Valo 13272e5d4a8fSHaim Dreyfuss static struct iwl_trans_pcie *iwl_pcie_get_trans_pcie(struct msix_entry *entry) 13282e5d4a8fSHaim Dreyfuss { 13292e5d4a8fSHaim Dreyfuss u8 queue = entry->entry; 13302e5d4a8fSHaim Dreyfuss struct msix_entry *entries = entry - queue; 13312e5d4a8fSHaim Dreyfuss 13322e5d4a8fSHaim Dreyfuss return container_of(entries, struct iwl_trans_pcie, msix_entries[0]); 13332e5d4a8fSHaim Dreyfuss } 13342e5d4a8fSHaim Dreyfuss 13352e5d4a8fSHaim Dreyfuss static inline void iwl_pcie_clear_irq(struct iwl_trans *trans, 13362e5d4a8fSHaim Dreyfuss struct msix_entry *entry) 13372e5d4a8fSHaim Dreyfuss { 13382e5d4a8fSHaim Dreyfuss /* 13392e5d4a8fSHaim Dreyfuss * Before sending the interrupt the HW disables it to prevent 13402e5d4a8fSHaim Dreyfuss * a nested interrupt. This is done by writing 1 to the corresponding 13412e5d4a8fSHaim Dreyfuss * bit in the mask register. After handling the interrupt, it should be 13422e5d4a8fSHaim Dreyfuss * re-enabled by clearing this bit. This register is defined as 13432e5d4a8fSHaim Dreyfuss * write 1 clear (W1C) register, meaning that it's being clear 13442e5d4a8fSHaim Dreyfuss * by writing 1 to the bit. 13452e5d4a8fSHaim Dreyfuss */ 13467ef3dd26SHaim Dreyfuss iwl_write32(trans, CSR_MSIX_AUTOMASK_ST_AD, BIT(entry->entry)); 13472e5d4a8fSHaim Dreyfuss } 13482e5d4a8fSHaim Dreyfuss 13492e5d4a8fSHaim Dreyfuss /* 13502e5d4a8fSHaim Dreyfuss * iwl_pcie_rx_msix_handle - Main entry function for receiving responses from fw 13512e5d4a8fSHaim Dreyfuss * This interrupt handler should be used with RSS queue only. 13522e5d4a8fSHaim Dreyfuss */ 13532e5d4a8fSHaim Dreyfuss irqreturn_t iwl_pcie_irq_rx_msix_handler(int irq, void *dev_id) 13542e5d4a8fSHaim Dreyfuss { 13552e5d4a8fSHaim Dreyfuss struct msix_entry *entry = dev_id; 13562e5d4a8fSHaim Dreyfuss struct iwl_trans_pcie *trans_pcie = iwl_pcie_get_trans_pcie(entry); 13572e5d4a8fSHaim Dreyfuss struct iwl_trans *trans = trans_pcie->trans; 13582e5d4a8fSHaim Dreyfuss 13595eae443eSSara Sharon if (WARN_ON(entry->entry >= trans->num_rx_queues)) 13605eae443eSSara Sharon return IRQ_NONE; 13615eae443eSSara Sharon 13622e5d4a8fSHaim Dreyfuss lock_map_acquire(&trans->sync_cmd_lockdep_map); 13632e5d4a8fSHaim Dreyfuss 13642e5d4a8fSHaim Dreyfuss local_bh_disable(); 13652e5d4a8fSHaim Dreyfuss iwl_pcie_rx_handle(trans, entry->entry); 13662e5d4a8fSHaim Dreyfuss local_bh_enable(); 13672e5d4a8fSHaim Dreyfuss 13682e5d4a8fSHaim Dreyfuss iwl_pcie_clear_irq(trans, entry); 13692e5d4a8fSHaim Dreyfuss 13702e5d4a8fSHaim Dreyfuss lock_map_release(&trans->sync_cmd_lockdep_map); 13712e5d4a8fSHaim Dreyfuss 13722e5d4a8fSHaim Dreyfuss return IRQ_HANDLED; 13732e5d4a8fSHaim Dreyfuss } 13742e5d4a8fSHaim Dreyfuss 1375e705c121SKalle Valo /* 1376e705c121SKalle Valo * iwl_pcie_irq_handle_error - called for HW or SW error interrupt from card 1377e705c121SKalle Valo */ 1378e705c121SKalle Valo static void iwl_pcie_irq_handle_error(struct iwl_trans *trans) 1379e705c121SKalle Valo { 1380e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1381e705c121SKalle Valo int i; 1382e705c121SKalle Valo 1383e705c121SKalle Valo /* W/A for WiFi/WiMAX coex and WiMAX own the RF */ 1384e705c121SKalle Valo if (trans->cfg->internal_wimax_coex && 1385e705c121SKalle Valo !trans->cfg->apmg_not_supported && 1386e705c121SKalle Valo (!(iwl_read_prph(trans, APMG_CLK_CTRL_REG) & 1387e705c121SKalle Valo APMS_CLK_VAL_MRB_FUNC_MODE) || 1388e705c121SKalle Valo (iwl_read_prph(trans, APMG_PS_CTRL_REG) & 1389e705c121SKalle Valo APMG_PS_CTRL_VAL_RESET_REQ))) { 1390e705c121SKalle Valo clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 1391e705c121SKalle Valo iwl_op_mode_wimax_active(trans->op_mode); 1392e705c121SKalle Valo wake_up(&trans_pcie->wait_command_queue); 1393e705c121SKalle Valo return; 1394e705c121SKalle Valo } 1395e705c121SKalle Valo 1396e705c121SKalle Valo iwl_pcie_dump_csr(trans); 1397e705c121SKalle Valo iwl_dump_fh(trans, NULL); 1398e705c121SKalle Valo 1399e705c121SKalle Valo local_bh_disable(); 1400e705c121SKalle Valo /* The STATUS_FW_ERROR bit is set in this function. This must happen 1401e705c121SKalle Valo * before we wake up the command caller, to ensure a proper cleanup. */ 1402e705c121SKalle Valo iwl_trans_fw_error(trans); 1403e705c121SKalle Valo local_bh_enable(); 1404e705c121SKalle Valo 1405e705c121SKalle Valo for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) 1406e705c121SKalle Valo del_timer(&trans_pcie->txq[i].stuck_timer); 1407e705c121SKalle Valo 1408e705c121SKalle Valo clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 1409e705c121SKalle Valo wake_up(&trans_pcie->wait_command_queue); 1410e705c121SKalle Valo } 1411e705c121SKalle Valo 1412e705c121SKalle Valo static u32 iwl_pcie_int_cause_non_ict(struct iwl_trans *trans) 1413e705c121SKalle Valo { 1414e705c121SKalle Valo u32 inta; 1415e705c121SKalle Valo 1416e705c121SKalle Valo lockdep_assert_held(&IWL_TRANS_GET_PCIE_TRANS(trans)->irq_lock); 1417e705c121SKalle Valo 1418e705c121SKalle Valo trace_iwlwifi_dev_irq(trans->dev); 1419e705c121SKalle Valo 1420e705c121SKalle Valo /* Discover which interrupts are active/pending */ 1421e705c121SKalle Valo inta = iwl_read32(trans, CSR_INT); 1422e705c121SKalle Valo 1423e705c121SKalle Valo /* the thread will service interrupts and re-enable them */ 1424e705c121SKalle Valo return inta; 1425e705c121SKalle Valo } 1426e705c121SKalle Valo 1427e705c121SKalle Valo /* a device (PCI-E) page is 4096 bytes long */ 1428e705c121SKalle Valo #define ICT_SHIFT 12 1429e705c121SKalle Valo #define ICT_SIZE (1 << ICT_SHIFT) 1430e705c121SKalle Valo #define ICT_COUNT (ICT_SIZE / sizeof(u32)) 1431e705c121SKalle Valo 1432e705c121SKalle Valo /* interrupt handler using ict table, with this interrupt driver will 1433e705c121SKalle Valo * stop using INTA register to get device's interrupt, reading this register 1434e705c121SKalle Valo * is expensive, device will write interrupts in ICT dram table, increment 1435e705c121SKalle Valo * index then will fire interrupt to driver, driver will OR all ICT table 1436e705c121SKalle Valo * entries from current index up to table entry with 0 value. the result is 1437e705c121SKalle Valo * the interrupt we need to service, driver will set the entries back to 0 and 1438e705c121SKalle Valo * set index. 1439e705c121SKalle Valo */ 1440e705c121SKalle Valo static u32 iwl_pcie_int_cause_ict(struct iwl_trans *trans) 1441e705c121SKalle Valo { 1442e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1443e705c121SKalle Valo u32 inta; 1444e705c121SKalle Valo u32 val = 0; 1445e705c121SKalle Valo u32 read; 1446e705c121SKalle Valo 1447e705c121SKalle Valo trace_iwlwifi_dev_irq(trans->dev); 1448e705c121SKalle Valo 1449e705c121SKalle Valo /* Ignore interrupt if there's nothing in NIC to service. 1450e705c121SKalle Valo * This may be due to IRQ shared with another device, 1451e705c121SKalle Valo * or due to sporadic interrupts thrown from our NIC. */ 1452e705c121SKalle Valo read = le32_to_cpu(trans_pcie->ict_tbl[trans_pcie->ict_index]); 1453e705c121SKalle Valo trace_iwlwifi_dev_ict_read(trans->dev, trans_pcie->ict_index, read); 1454e705c121SKalle Valo if (!read) 1455e705c121SKalle Valo return 0; 1456e705c121SKalle Valo 1457e705c121SKalle Valo /* 1458e705c121SKalle Valo * Collect all entries up to the first 0, starting from ict_index; 1459e705c121SKalle Valo * note we already read at ict_index. 1460e705c121SKalle Valo */ 1461e705c121SKalle Valo do { 1462e705c121SKalle Valo val |= read; 1463e705c121SKalle Valo IWL_DEBUG_ISR(trans, "ICT index %d value 0x%08X\n", 1464e705c121SKalle Valo trans_pcie->ict_index, read); 1465e705c121SKalle Valo trans_pcie->ict_tbl[trans_pcie->ict_index] = 0; 1466e705c121SKalle Valo trans_pcie->ict_index = 1467e705c121SKalle Valo ((trans_pcie->ict_index + 1) & (ICT_COUNT - 1)); 1468e705c121SKalle Valo 1469e705c121SKalle Valo read = le32_to_cpu(trans_pcie->ict_tbl[trans_pcie->ict_index]); 1470e705c121SKalle Valo trace_iwlwifi_dev_ict_read(trans->dev, trans_pcie->ict_index, 1471e705c121SKalle Valo read); 1472e705c121SKalle Valo } while (read); 1473e705c121SKalle Valo 1474e705c121SKalle Valo /* We should not get this value, just ignore it. */ 1475e705c121SKalle Valo if (val == 0xffffffff) 1476e705c121SKalle Valo val = 0; 1477e705c121SKalle Valo 1478e705c121SKalle Valo /* 1479e705c121SKalle Valo * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit 1480e705c121SKalle Valo * (bit 15 before shifting it to 31) to clear when using interrupt 1481e705c121SKalle Valo * coalescing. fortunately, bits 18 and 19 stay set when this happens 1482e705c121SKalle Valo * so we use them to decide on the real state of the Rx bit. 1483e705c121SKalle Valo * In order words, bit 15 is set if bit 18 or bit 19 are set. 1484e705c121SKalle Valo */ 1485e705c121SKalle Valo if (val & 0xC0000) 1486e705c121SKalle Valo val |= 0x8000; 1487e705c121SKalle Valo 1488e705c121SKalle Valo inta = (0xff & val) | ((0xff00 & val) << 16); 1489e705c121SKalle Valo return inta; 1490e705c121SKalle Valo } 1491e705c121SKalle Valo 1492e705c121SKalle Valo irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id) 1493e705c121SKalle Valo { 1494e705c121SKalle Valo struct iwl_trans *trans = dev_id; 1495e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1496e705c121SKalle Valo struct isr_statistics *isr_stats = &trans_pcie->isr_stats; 1497e705c121SKalle Valo u32 inta = 0; 1498e705c121SKalle Valo u32 handled = 0; 1499e705c121SKalle Valo 1500e705c121SKalle Valo lock_map_acquire(&trans->sync_cmd_lockdep_map); 1501e705c121SKalle Valo 1502e705c121SKalle Valo spin_lock(&trans_pcie->irq_lock); 1503e705c121SKalle Valo 1504e705c121SKalle Valo /* dram interrupt table not set yet, 1505e705c121SKalle Valo * use legacy interrupt. 1506e705c121SKalle Valo */ 1507e705c121SKalle Valo if (likely(trans_pcie->use_ict)) 1508e705c121SKalle Valo inta = iwl_pcie_int_cause_ict(trans); 1509e705c121SKalle Valo else 1510e705c121SKalle Valo inta = iwl_pcie_int_cause_non_ict(trans); 1511e705c121SKalle Valo 1512e705c121SKalle Valo if (iwl_have_debug_level(IWL_DL_ISR)) { 1513e705c121SKalle Valo IWL_DEBUG_ISR(trans, 1514e705c121SKalle Valo "ISR inta 0x%08x, enabled 0x%08x(sw), enabled(hw) 0x%08x, fh 0x%08x\n", 1515e705c121SKalle Valo inta, trans_pcie->inta_mask, 1516e705c121SKalle Valo iwl_read32(trans, CSR_INT_MASK), 1517e705c121SKalle Valo iwl_read32(trans, CSR_FH_INT_STATUS)); 1518e705c121SKalle Valo if (inta & (~trans_pcie->inta_mask)) 1519e705c121SKalle Valo IWL_DEBUG_ISR(trans, 1520e705c121SKalle Valo "We got a masked interrupt (0x%08x)\n", 1521e705c121SKalle Valo inta & (~trans_pcie->inta_mask)); 1522e705c121SKalle Valo } 1523e705c121SKalle Valo 1524e705c121SKalle Valo inta &= trans_pcie->inta_mask; 1525e705c121SKalle Valo 1526e705c121SKalle Valo /* 1527e705c121SKalle Valo * Ignore interrupt if there's nothing in NIC to service. 1528e705c121SKalle Valo * This may be due to IRQ shared with another device, 1529e705c121SKalle Valo * or due to sporadic interrupts thrown from our NIC. 1530e705c121SKalle Valo */ 1531e705c121SKalle Valo if (unlikely(!inta)) { 1532e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Ignore interrupt, inta == 0\n"); 1533e705c121SKalle Valo /* 1534e705c121SKalle Valo * Re-enable interrupts here since we don't 1535e705c121SKalle Valo * have anything to service 1536e705c121SKalle Valo */ 1537e705c121SKalle Valo if (test_bit(STATUS_INT_ENABLED, &trans->status)) 1538e705c121SKalle Valo iwl_enable_interrupts(trans); 1539e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1540e705c121SKalle Valo lock_map_release(&trans->sync_cmd_lockdep_map); 1541e705c121SKalle Valo return IRQ_NONE; 1542e705c121SKalle Valo } 1543e705c121SKalle Valo 1544e705c121SKalle Valo if (unlikely(inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0)) { 1545e705c121SKalle Valo /* 1546e705c121SKalle Valo * Hardware disappeared. It might have 1547e705c121SKalle Valo * already raised an interrupt. 1548e705c121SKalle Valo */ 1549e705c121SKalle Valo IWL_WARN(trans, "HARDWARE GONE?? INTA == 0x%08x\n", inta); 1550e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1551e705c121SKalle Valo goto out; 1552e705c121SKalle Valo } 1553e705c121SKalle Valo 1554e705c121SKalle Valo /* Ack/clear/reset pending uCode interrupts. 1555e705c121SKalle Valo * Note: Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS, 1556e705c121SKalle Valo */ 1557e705c121SKalle Valo /* There is a hardware bug in the interrupt mask function that some 1558e705c121SKalle Valo * interrupts (i.e. CSR_INT_BIT_SCD) can still be generated even if 1559e705c121SKalle Valo * they are disabled in the CSR_INT_MASK register. Furthermore the 1560e705c121SKalle Valo * ICT interrupt handling mechanism has another bug that might cause 1561e705c121SKalle Valo * these unmasked interrupts fail to be detected. We workaround the 1562e705c121SKalle Valo * hardware bugs here by ACKing all the possible interrupts so that 1563e705c121SKalle Valo * interrupt coalescing can still be achieved. 1564e705c121SKalle Valo */ 1565e705c121SKalle Valo iwl_write32(trans, CSR_INT, inta | ~trans_pcie->inta_mask); 1566e705c121SKalle Valo 1567e705c121SKalle Valo if (iwl_have_debug_level(IWL_DL_ISR)) 1568e705c121SKalle Valo IWL_DEBUG_ISR(trans, "inta 0x%08x, enabled 0x%08x\n", 1569e705c121SKalle Valo inta, iwl_read32(trans, CSR_INT_MASK)); 1570e705c121SKalle Valo 1571e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1572e705c121SKalle Valo 1573e705c121SKalle Valo /* Now service all interrupt bits discovered above. */ 1574e705c121SKalle Valo if (inta & CSR_INT_BIT_HW_ERR) { 1575e705c121SKalle Valo IWL_ERR(trans, "Hardware error detected. Restarting.\n"); 1576e705c121SKalle Valo 1577e705c121SKalle Valo /* Tell the device to stop sending interrupts */ 1578e705c121SKalle Valo iwl_disable_interrupts(trans); 1579e705c121SKalle Valo 1580e705c121SKalle Valo isr_stats->hw++; 1581e705c121SKalle Valo iwl_pcie_irq_handle_error(trans); 1582e705c121SKalle Valo 1583e705c121SKalle Valo handled |= CSR_INT_BIT_HW_ERR; 1584e705c121SKalle Valo 1585e705c121SKalle Valo goto out; 1586e705c121SKalle Valo } 1587e705c121SKalle Valo 1588e705c121SKalle Valo if (iwl_have_debug_level(IWL_DL_ISR)) { 1589e705c121SKalle Valo /* NIC fires this, but we don't use it, redundant with WAKEUP */ 1590e705c121SKalle Valo if (inta & CSR_INT_BIT_SCD) { 1591e705c121SKalle Valo IWL_DEBUG_ISR(trans, 1592e705c121SKalle Valo "Scheduler finished to transmit the frame/frames.\n"); 1593e705c121SKalle Valo isr_stats->sch++; 1594e705c121SKalle Valo } 1595e705c121SKalle Valo 1596e705c121SKalle Valo /* Alive notification via Rx interrupt will do the real work */ 1597e705c121SKalle Valo if (inta & CSR_INT_BIT_ALIVE) { 1598e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Alive interrupt\n"); 1599e705c121SKalle Valo isr_stats->alive++; 1600e705c121SKalle Valo } 1601e705c121SKalle Valo } 1602e705c121SKalle Valo 1603e705c121SKalle Valo /* Safely ignore these bits for debug checks below */ 1604e705c121SKalle Valo inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE); 1605e705c121SKalle Valo 1606e705c121SKalle Valo /* HW RF KILL switch toggled */ 1607e705c121SKalle Valo if (inta & CSR_INT_BIT_RF_KILL) { 1608e705c121SKalle Valo bool hw_rfkill; 1609e705c121SKalle Valo 1610e705c121SKalle Valo hw_rfkill = iwl_is_rfkill_set(trans); 1611e705c121SKalle Valo IWL_WARN(trans, "RF_KILL bit toggled to %s.\n", 1612e705c121SKalle Valo hw_rfkill ? "disable radio" : "enable radio"); 1613e705c121SKalle Valo 1614e705c121SKalle Valo isr_stats->rfkill++; 1615e705c121SKalle Valo 1616e705c121SKalle Valo mutex_lock(&trans_pcie->mutex); 1617e705c121SKalle Valo iwl_trans_pcie_rf_kill(trans, hw_rfkill); 1618e705c121SKalle Valo mutex_unlock(&trans_pcie->mutex); 1619e705c121SKalle Valo if (hw_rfkill) { 1620e705c121SKalle Valo set_bit(STATUS_RFKILL, &trans->status); 1621e705c121SKalle Valo if (test_and_clear_bit(STATUS_SYNC_HCMD_ACTIVE, 1622e705c121SKalle Valo &trans->status)) 1623e705c121SKalle Valo IWL_DEBUG_RF_KILL(trans, 1624e705c121SKalle Valo "Rfkill while SYNC HCMD in flight\n"); 1625e705c121SKalle Valo wake_up(&trans_pcie->wait_command_queue); 1626e705c121SKalle Valo } else { 1627e705c121SKalle Valo clear_bit(STATUS_RFKILL, &trans->status); 1628e705c121SKalle Valo } 1629e705c121SKalle Valo 1630e705c121SKalle Valo handled |= CSR_INT_BIT_RF_KILL; 1631e705c121SKalle Valo } 1632e705c121SKalle Valo 1633e705c121SKalle Valo /* Chip got too hot and stopped itself */ 1634e705c121SKalle Valo if (inta & CSR_INT_BIT_CT_KILL) { 1635e705c121SKalle Valo IWL_ERR(trans, "Microcode CT kill error detected.\n"); 1636e705c121SKalle Valo isr_stats->ctkill++; 1637e705c121SKalle Valo handled |= CSR_INT_BIT_CT_KILL; 1638e705c121SKalle Valo } 1639e705c121SKalle Valo 1640e705c121SKalle Valo /* Error detected by uCode */ 1641e705c121SKalle Valo if (inta & CSR_INT_BIT_SW_ERR) { 1642e705c121SKalle Valo IWL_ERR(trans, "Microcode SW error detected. " 1643e705c121SKalle Valo " Restarting 0x%X.\n", inta); 1644e705c121SKalle Valo isr_stats->sw++; 1645e705c121SKalle Valo iwl_pcie_irq_handle_error(trans); 1646e705c121SKalle Valo handled |= CSR_INT_BIT_SW_ERR; 1647e705c121SKalle Valo } 1648e705c121SKalle Valo 1649e705c121SKalle Valo /* uCode wakes up after power-down sleep */ 1650e705c121SKalle Valo if (inta & CSR_INT_BIT_WAKEUP) { 1651e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Wakeup interrupt\n"); 1652e705c121SKalle Valo iwl_pcie_rxq_check_wrptr(trans); 1653e705c121SKalle Valo iwl_pcie_txq_check_wrptrs(trans); 1654e705c121SKalle Valo 1655e705c121SKalle Valo isr_stats->wakeup++; 1656e705c121SKalle Valo 1657e705c121SKalle Valo handled |= CSR_INT_BIT_WAKEUP; 1658e705c121SKalle Valo } 1659e705c121SKalle Valo 1660e705c121SKalle Valo /* All uCode command responses, including Tx command responses, 1661e705c121SKalle Valo * Rx "responses" (frame-received notification), and other 1662e705c121SKalle Valo * notifications from uCode come through here*/ 1663e705c121SKalle Valo if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX | 1664e705c121SKalle Valo CSR_INT_BIT_RX_PERIODIC)) { 1665e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Rx interrupt\n"); 1666e705c121SKalle Valo if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) { 1667e705c121SKalle Valo handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX); 1668e705c121SKalle Valo iwl_write32(trans, CSR_FH_INT_STATUS, 1669e705c121SKalle Valo CSR_FH_INT_RX_MASK); 1670e705c121SKalle Valo } 1671e705c121SKalle Valo if (inta & CSR_INT_BIT_RX_PERIODIC) { 1672e705c121SKalle Valo handled |= CSR_INT_BIT_RX_PERIODIC; 1673e705c121SKalle Valo iwl_write32(trans, 1674e705c121SKalle Valo CSR_INT, CSR_INT_BIT_RX_PERIODIC); 1675e705c121SKalle Valo } 1676e705c121SKalle Valo /* Sending RX interrupt require many steps to be done in the 1677e705c121SKalle Valo * the device: 1678e705c121SKalle Valo * 1- write interrupt to current index in ICT table. 1679e705c121SKalle Valo * 2- dma RX frame. 1680e705c121SKalle Valo * 3- update RX shared data to indicate last write index. 1681e705c121SKalle Valo * 4- send interrupt. 1682e705c121SKalle Valo * This could lead to RX race, driver could receive RX interrupt 1683e705c121SKalle Valo * but the shared data changes does not reflect this; 1684e705c121SKalle Valo * periodic interrupt will detect any dangling Rx activity. 1685e705c121SKalle Valo */ 1686e705c121SKalle Valo 1687e705c121SKalle Valo /* Disable periodic interrupt; we use it as just a one-shot. */ 1688e705c121SKalle Valo iwl_write8(trans, CSR_INT_PERIODIC_REG, 1689e705c121SKalle Valo CSR_INT_PERIODIC_DIS); 1690e705c121SKalle Valo 1691e705c121SKalle Valo /* 1692e705c121SKalle Valo * Enable periodic interrupt in 8 msec only if we received 1693e705c121SKalle Valo * real RX interrupt (instead of just periodic int), to catch 1694e705c121SKalle Valo * any dangling Rx interrupt. If it was just the periodic 1695e705c121SKalle Valo * interrupt, there was no dangling Rx activity, and no need 1696e705c121SKalle Valo * to extend the periodic interrupt; one-shot is enough. 1697e705c121SKalle Valo */ 1698e705c121SKalle Valo if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) 1699e705c121SKalle Valo iwl_write8(trans, CSR_INT_PERIODIC_REG, 1700e705c121SKalle Valo CSR_INT_PERIODIC_ENA); 1701e705c121SKalle Valo 1702e705c121SKalle Valo isr_stats->rx++; 1703e705c121SKalle Valo 1704e705c121SKalle Valo local_bh_disable(); 17052e5d4a8fSHaim Dreyfuss iwl_pcie_rx_handle(trans, 0); 1706e705c121SKalle Valo local_bh_enable(); 1707e705c121SKalle Valo } 1708e705c121SKalle Valo 1709e705c121SKalle Valo /* This "Tx" DMA channel is used only for loading uCode */ 1710e705c121SKalle Valo if (inta & CSR_INT_BIT_FH_TX) { 1711e705c121SKalle Valo iwl_write32(trans, CSR_FH_INT_STATUS, CSR_FH_INT_TX_MASK); 1712e705c121SKalle Valo IWL_DEBUG_ISR(trans, "uCode load interrupt\n"); 1713e705c121SKalle Valo isr_stats->tx++; 1714e705c121SKalle Valo handled |= CSR_INT_BIT_FH_TX; 1715e705c121SKalle Valo /* Wake up uCode load routine, now that load is complete */ 1716e705c121SKalle Valo trans_pcie->ucode_write_complete = true; 1717e705c121SKalle Valo wake_up(&trans_pcie->ucode_write_waitq); 1718e705c121SKalle Valo } 1719e705c121SKalle Valo 1720e705c121SKalle Valo if (inta & ~handled) { 1721e705c121SKalle Valo IWL_ERR(trans, "Unhandled INTA bits 0x%08x\n", inta & ~handled); 1722e705c121SKalle Valo isr_stats->unhandled++; 1723e705c121SKalle Valo } 1724e705c121SKalle Valo 1725e705c121SKalle Valo if (inta & ~(trans_pcie->inta_mask)) { 1726e705c121SKalle Valo IWL_WARN(trans, "Disabled INTA bits 0x%08x were pending\n", 1727e705c121SKalle Valo inta & ~trans_pcie->inta_mask); 1728e705c121SKalle Valo } 1729e705c121SKalle Valo 1730a6bd005fSEmmanuel Grumbach /* we are loading the firmware, enable FH_TX interrupt only */ 1731a6bd005fSEmmanuel Grumbach if (handled & CSR_INT_BIT_FH_TX) 1732a6bd005fSEmmanuel Grumbach iwl_enable_fw_load_int(trans); 1733a6bd005fSEmmanuel Grumbach /* only Re-enable all interrupt if disabled by irq */ 1734a6bd005fSEmmanuel Grumbach else if (test_bit(STATUS_INT_ENABLED, &trans->status)) 1735e705c121SKalle Valo iwl_enable_interrupts(trans); 1736e705c121SKalle Valo /* Re-enable RF_KILL if it occurred */ 1737e705c121SKalle Valo else if (handled & CSR_INT_BIT_RF_KILL) 1738e705c121SKalle Valo iwl_enable_rfkill_int(trans); 1739e705c121SKalle Valo 1740e705c121SKalle Valo out: 1741e705c121SKalle Valo lock_map_release(&trans->sync_cmd_lockdep_map); 1742e705c121SKalle Valo return IRQ_HANDLED; 1743e705c121SKalle Valo } 1744e705c121SKalle Valo 1745e705c121SKalle Valo /****************************************************************************** 1746e705c121SKalle Valo * 1747e705c121SKalle Valo * ICT functions 1748e705c121SKalle Valo * 1749e705c121SKalle Valo ******************************************************************************/ 1750e705c121SKalle Valo 1751e705c121SKalle Valo /* Free dram table */ 1752e705c121SKalle Valo void iwl_pcie_free_ict(struct iwl_trans *trans) 1753e705c121SKalle Valo { 1754e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1755e705c121SKalle Valo 1756e705c121SKalle Valo if (trans_pcie->ict_tbl) { 1757e705c121SKalle Valo dma_free_coherent(trans->dev, ICT_SIZE, 1758e705c121SKalle Valo trans_pcie->ict_tbl, 1759e705c121SKalle Valo trans_pcie->ict_tbl_dma); 1760e705c121SKalle Valo trans_pcie->ict_tbl = NULL; 1761e705c121SKalle Valo trans_pcie->ict_tbl_dma = 0; 1762e705c121SKalle Valo } 1763e705c121SKalle Valo } 1764e705c121SKalle Valo 1765e705c121SKalle Valo /* 1766e705c121SKalle Valo * allocate dram shared table, it is an aligned memory 1767e705c121SKalle Valo * block of ICT_SIZE. 1768e705c121SKalle Valo * also reset all data related to ICT table interrupt. 1769e705c121SKalle Valo */ 1770e705c121SKalle Valo int iwl_pcie_alloc_ict(struct iwl_trans *trans) 1771e705c121SKalle Valo { 1772e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1773e705c121SKalle Valo 1774e705c121SKalle Valo trans_pcie->ict_tbl = 1775e705c121SKalle Valo dma_zalloc_coherent(trans->dev, ICT_SIZE, 1776e705c121SKalle Valo &trans_pcie->ict_tbl_dma, 1777e705c121SKalle Valo GFP_KERNEL); 1778e705c121SKalle Valo if (!trans_pcie->ict_tbl) 1779e705c121SKalle Valo return -ENOMEM; 1780e705c121SKalle Valo 1781e705c121SKalle Valo /* just an API sanity check ... it is guaranteed to be aligned */ 1782e705c121SKalle Valo if (WARN_ON(trans_pcie->ict_tbl_dma & (ICT_SIZE - 1))) { 1783e705c121SKalle Valo iwl_pcie_free_ict(trans); 1784e705c121SKalle Valo return -EINVAL; 1785e705c121SKalle Valo } 1786e705c121SKalle Valo 1787e705c121SKalle Valo return 0; 1788e705c121SKalle Valo } 1789e705c121SKalle Valo 1790e705c121SKalle Valo /* Device is going up inform it about using ICT interrupt table, 1791e705c121SKalle Valo * also we need to tell the driver to start using ICT interrupt. 1792e705c121SKalle Valo */ 1793e705c121SKalle Valo void iwl_pcie_reset_ict(struct iwl_trans *trans) 1794e705c121SKalle Valo { 1795e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1796e705c121SKalle Valo u32 val; 1797e705c121SKalle Valo 1798e705c121SKalle Valo if (!trans_pcie->ict_tbl) 1799e705c121SKalle Valo return; 1800e705c121SKalle Valo 1801e705c121SKalle Valo spin_lock(&trans_pcie->irq_lock); 1802e705c121SKalle Valo iwl_disable_interrupts(trans); 1803e705c121SKalle Valo 1804e705c121SKalle Valo memset(trans_pcie->ict_tbl, 0, ICT_SIZE); 1805e705c121SKalle Valo 1806e705c121SKalle Valo val = trans_pcie->ict_tbl_dma >> ICT_SHIFT; 1807e705c121SKalle Valo 1808e705c121SKalle Valo val |= CSR_DRAM_INT_TBL_ENABLE | 1809e705c121SKalle Valo CSR_DRAM_INIT_TBL_WRAP_CHECK | 1810e705c121SKalle Valo CSR_DRAM_INIT_TBL_WRITE_POINTER; 1811e705c121SKalle Valo 1812e705c121SKalle Valo IWL_DEBUG_ISR(trans, "CSR_DRAM_INT_TBL_REG =0x%x\n", val); 1813e705c121SKalle Valo 1814e705c121SKalle Valo iwl_write32(trans, CSR_DRAM_INT_TBL_REG, val); 1815e705c121SKalle Valo trans_pcie->use_ict = true; 1816e705c121SKalle Valo trans_pcie->ict_index = 0; 1817e705c121SKalle Valo iwl_write32(trans, CSR_INT, trans_pcie->inta_mask); 1818e705c121SKalle Valo iwl_enable_interrupts(trans); 1819e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1820e705c121SKalle Valo } 1821e705c121SKalle Valo 1822e705c121SKalle Valo /* Device is going down disable ict interrupt usage */ 1823e705c121SKalle Valo void iwl_pcie_disable_ict(struct iwl_trans *trans) 1824e705c121SKalle Valo { 1825e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1826e705c121SKalle Valo 1827e705c121SKalle Valo spin_lock(&trans_pcie->irq_lock); 1828e705c121SKalle Valo trans_pcie->use_ict = false; 1829e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1830e705c121SKalle Valo } 1831e705c121SKalle Valo 1832e705c121SKalle Valo irqreturn_t iwl_pcie_isr(int irq, void *data) 1833e705c121SKalle Valo { 1834e705c121SKalle Valo struct iwl_trans *trans = data; 1835e705c121SKalle Valo 1836e705c121SKalle Valo if (!trans) 1837e705c121SKalle Valo return IRQ_NONE; 1838e705c121SKalle Valo 1839e705c121SKalle Valo /* Disable (but don't clear!) interrupts here to avoid 1840e705c121SKalle Valo * back-to-back ISRs and sporadic interrupts from our NIC. 1841e705c121SKalle Valo * If we have something to service, the tasklet will re-enable ints. 1842e705c121SKalle Valo * If we *don't* have something, we'll re-enable before leaving here. 1843e705c121SKalle Valo */ 1844e705c121SKalle Valo iwl_write32(trans, CSR_INT_MASK, 0x00000000); 1845e705c121SKalle Valo 1846e705c121SKalle Valo return IRQ_WAKE_THREAD; 1847e705c121SKalle Valo } 18482e5d4a8fSHaim Dreyfuss 18492e5d4a8fSHaim Dreyfuss irqreturn_t iwl_pcie_msix_isr(int irq, void *data) 18502e5d4a8fSHaim Dreyfuss { 18512e5d4a8fSHaim Dreyfuss return IRQ_WAKE_THREAD; 18522e5d4a8fSHaim Dreyfuss } 18532e5d4a8fSHaim Dreyfuss 18542e5d4a8fSHaim Dreyfuss irqreturn_t iwl_pcie_irq_msix_handler(int irq, void *dev_id) 18552e5d4a8fSHaim Dreyfuss { 18562e5d4a8fSHaim Dreyfuss struct msix_entry *entry = dev_id; 18572e5d4a8fSHaim Dreyfuss struct iwl_trans_pcie *trans_pcie = iwl_pcie_get_trans_pcie(entry); 18582e5d4a8fSHaim Dreyfuss struct iwl_trans *trans = trans_pcie->trans; 185946167a8fSColin Ian King struct isr_statistics *isr_stats = &trans_pcie->isr_stats; 18602e5d4a8fSHaim Dreyfuss u32 inta_fh, inta_hw; 18612e5d4a8fSHaim Dreyfuss 18622e5d4a8fSHaim Dreyfuss lock_map_acquire(&trans->sync_cmd_lockdep_map); 18632e5d4a8fSHaim Dreyfuss 18642e5d4a8fSHaim Dreyfuss spin_lock(&trans_pcie->irq_lock); 18657ef3dd26SHaim Dreyfuss inta_fh = iwl_read32(trans, CSR_MSIX_FH_INT_CAUSES_AD); 18667ef3dd26SHaim Dreyfuss inta_hw = iwl_read32(trans, CSR_MSIX_HW_INT_CAUSES_AD); 18672e5d4a8fSHaim Dreyfuss /* 18682e5d4a8fSHaim Dreyfuss * Clear causes registers to avoid being handling the same cause. 18692e5d4a8fSHaim Dreyfuss */ 18707ef3dd26SHaim Dreyfuss iwl_write32(trans, CSR_MSIX_FH_INT_CAUSES_AD, inta_fh); 18717ef3dd26SHaim Dreyfuss iwl_write32(trans, CSR_MSIX_HW_INT_CAUSES_AD, inta_hw); 18722e5d4a8fSHaim Dreyfuss spin_unlock(&trans_pcie->irq_lock); 18732e5d4a8fSHaim Dreyfuss 18742e5d4a8fSHaim Dreyfuss if (unlikely(!(inta_fh | inta_hw))) { 18752e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "Ignore interrupt, inta == 0\n"); 18762e5d4a8fSHaim Dreyfuss lock_map_release(&trans->sync_cmd_lockdep_map); 18772e5d4a8fSHaim Dreyfuss return IRQ_NONE; 18782e5d4a8fSHaim Dreyfuss } 18792e5d4a8fSHaim Dreyfuss 18802e5d4a8fSHaim Dreyfuss if (iwl_have_debug_level(IWL_DL_ISR)) 18812e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "ISR inta_fh 0x%08x, enabled 0x%08x\n", 18822e5d4a8fSHaim Dreyfuss inta_fh, 18832e5d4a8fSHaim Dreyfuss iwl_read32(trans, CSR_MSIX_FH_INT_MASK_AD)); 18842e5d4a8fSHaim Dreyfuss 18852e5d4a8fSHaim Dreyfuss /* This "Tx" DMA channel is used only for loading uCode */ 18862e5d4a8fSHaim Dreyfuss if (inta_fh & MSIX_FH_INT_CAUSES_D2S_CH0_NUM) { 18872e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "uCode load interrupt\n"); 18882e5d4a8fSHaim Dreyfuss isr_stats->tx++; 18892e5d4a8fSHaim Dreyfuss /* 18902e5d4a8fSHaim Dreyfuss * Wake up uCode load routine, 18912e5d4a8fSHaim Dreyfuss * now that load is complete 18922e5d4a8fSHaim Dreyfuss */ 18932e5d4a8fSHaim Dreyfuss trans_pcie->ucode_write_complete = true; 18942e5d4a8fSHaim Dreyfuss wake_up(&trans_pcie->ucode_write_waitq); 18952e5d4a8fSHaim Dreyfuss } 18962e5d4a8fSHaim Dreyfuss 18972e5d4a8fSHaim Dreyfuss /* Error detected by uCode */ 18982e5d4a8fSHaim Dreyfuss if ((inta_fh & MSIX_FH_INT_CAUSES_FH_ERR) || 18992e5d4a8fSHaim Dreyfuss (inta_hw & MSIX_HW_INT_CAUSES_REG_SW_ERR)) { 19002e5d4a8fSHaim Dreyfuss IWL_ERR(trans, 19012e5d4a8fSHaim Dreyfuss "Microcode SW error detected. Restarting 0x%X.\n", 19022e5d4a8fSHaim Dreyfuss inta_fh); 19032e5d4a8fSHaim Dreyfuss isr_stats->sw++; 19042e5d4a8fSHaim Dreyfuss iwl_pcie_irq_handle_error(trans); 19052e5d4a8fSHaim Dreyfuss } 19062e5d4a8fSHaim Dreyfuss 19072e5d4a8fSHaim Dreyfuss /* After checking FH register check HW register */ 19082e5d4a8fSHaim Dreyfuss if (iwl_have_debug_level(IWL_DL_ISR)) 19092e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, 19102e5d4a8fSHaim Dreyfuss "ISR inta_hw 0x%08x, enabled 0x%08x\n", 19112e5d4a8fSHaim Dreyfuss inta_hw, 19122e5d4a8fSHaim Dreyfuss iwl_read32(trans, CSR_MSIX_HW_INT_MASK_AD)); 19132e5d4a8fSHaim Dreyfuss 19142e5d4a8fSHaim Dreyfuss /* Alive notification via Rx interrupt will do the real work */ 19152e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_ALIVE) { 19162e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "Alive interrupt\n"); 19172e5d4a8fSHaim Dreyfuss isr_stats->alive++; 19182e5d4a8fSHaim Dreyfuss } 19192e5d4a8fSHaim Dreyfuss 19202e5d4a8fSHaim Dreyfuss /* uCode wakes up after power-down sleep */ 19212e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_WAKEUP) { 19222e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "Wakeup interrupt\n"); 19232e5d4a8fSHaim Dreyfuss iwl_pcie_rxq_check_wrptr(trans); 19242e5d4a8fSHaim Dreyfuss iwl_pcie_txq_check_wrptrs(trans); 19252e5d4a8fSHaim Dreyfuss 19262e5d4a8fSHaim Dreyfuss isr_stats->wakeup++; 19272e5d4a8fSHaim Dreyfuss } 19282e5d4a8fSHaim Dreyfuss 19292e5d4a8fSHaim Dreyfuss /* Chip got too hot and stopped itself */ 19302e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_CT_KILL) { 19312e5d4a8fSHaim Dreyfuss IWL_ERR(trans, "Microcode CT kill error detected.\n"); 19322e5d4a8fSHaim Dreyfuss isr_stats->ctkill++; 19332e5d4a8fSHaim Dreyfuss } 19342e5d4a8fSHaim Dreyfuss 19352e5d4a8fSHaim Dreyfuss /* HW RF KILL switch toggled */ 19362e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_RF_KILL) { 19372e5d4a8fSHaim Dreyfuss bool hw_rfkill; 19382e5d4a8fSHaim Dreyfuss 19392e5d4a8fSHaim Dreyfuss hw_rfkill = iwl_is_rfkill_set(trans); 19402e5d4a8fSHaim Dreyfuss IWL_WARN(trans, "RF_KILL bit toggled to %s.\n", 19412e5d4a8fSHaim Dreyfuss hw_rfkill ? "disable radio" : "enable radio"); 19422e5d4a8fSHaim Dreyfuss 19432e5d4a8fSHaim Dreyfuss isr_stats->rfkill++; 19442e5d4a8fSHaim Dreyfuss 19452e5d4a8fSHaim Dreyfuss mutex_lock(&trans_pcie->mutex); 19462e5d4a8fSHaim Dreyfuss iwl_trans_pcie_rf_kill(trans, hw_rfkill); 19472e5d4a8fSHaim Dreyfuss mutex_unlock(&trans_pcie->mutex); 19482e5d4a8fSHaim Dreyfuss if (hw_rfkill) { 19492e5d4a8fSHaim Dreyfuss set_bit(STATUS_RFKILL, &trans->status); 19502e5d4a8fSHaim Dreyfuss if (test_and_clear_bit(STATUS_SYNC_HCMD_ACTIVE, 19512e5d4a8fSHaim Dreyfuss &trans->status)) 19522e5d4a8fSHaim Dreyfuss IWL_DEBUG_RF_KILL(trans, 19532e5d4a8fSHaim Dreyfuss "Rfkill while SYNC HCMD in flight\n"); 19542e5d4a8fSHaim Dreyfuss wake_up(&trans_pcie->wait_command_queue); 19552e5d4a8fSHaim Dreyfuss } else { 19562e5d4a8fSHaim Dreyfuss clear_bit(STATUS_RFKILL, &trans->status); 19572e5d4a8fSHaim Dreyfuss } 19582e5d4a8fSHaim Dreyfuss } 19592e5d4a8fSHaim Dreyfuss 19602e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_HW_ERR) { 19612e5d4a8fSHaim Dreyfuss IWL_ERR(trans, 19622e5d4a8fSHaim Dreyfuss "Hardware error detected. Restarting.\n"); 19632e5d4a8fSHaim Dreyfuss 19642e5d4a8fSHaim Dreyfuss isr_stats->hw++; 19652e5d4a8fSHaim Dreyfuss iwl_pcie_irq_handle_error(trans); 19662e5d4a8fSHaim Dreyfuss } 19672e5d4a8fSHaim Dreyfuss 19682e5d4a8fSHaim Dreyfuss iwl_pcie_clear_irq(trans, entry); 19692e5d4a8fSHaim Dreyfuss 19702e5d4a8fSHaim Dreyfuss lock_map_release(&trans->sync_cmd_lockdep_map); 19712e5d4a8fSHaim Dreyfuss 19722e5d4a8fSHaim Dreyfuss return IRQ_HANDLED; 19732e5d4a8fSHaim Dreyfuss } 1974