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 16496a6497bSSara Sharon static void iwl_pcie_write_prph_64(struct iwl_trans *trans, u64 ofs, u64 val) 16596a6497bSSara Sharon { 16696a6497bSSara Sharon iwl_write_prph(trans, ofs, val & 0xffffffff); 16796a6497bSSara Sharon iwl_write_prph(trans, ofs + 4, val >> 32); 16896a6497bSSara Sharon } 16996a6497bSSara Sharon 170e705c121SKalle Valo /* 171e705c121SKalle Valo * iwl_pcie_rx_stop - stops the Rx DMA 172e705c121SKalle Valo */ 173e705c121SKalle Valo int iwl_pcie_rx_stop(struct iwl_trans *trans) 174e705c121SKalle Valo { 175e705c121SKalle Valo iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0); 176e705c121SKalle Valo return iwl_poll_direct_bit(trans, FH_MEM_RSSR_RX_STATUS_REG, 177e705c121SKalle Valo FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000); 178e705c121SKalle Valo } 179e705c121SKalle Valo 180e705c121SKalle Valo /* 181e705c121SKalle Valo * iwl_pcie_rxq_inc_wr_ptr - Update the write pointer for the RX queue 182e705c121SKalle Valo */ 18378485054SSara Sharon static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans, 18478485054SSara Sharon struct iwl_rxq *rxq) 185e705c121SKalle Valo { 186e705c121SKalle Valo u32 reg; 187e705c121SKalle Valo 188e705c121SKalle Valo lockdep_assert_held(&rxq->lock); 189e705c121SKalle Valo 190e705c121SKalle Valo /* 191e705c121SKalle Valo * explicitly wake up the NIC if: 192e705c121SKalle Valo * 1. shadow registers aren't enabled 193e705c121SKalle Valo * 2. there is a chance that the NIC is asleep 194e705c121SKalle Valo */ 195e705c121SKalle Valo if (!trans->cfg->base_params->shadow_reg_enable && 196e705c121SKalle Valo test_bit(STATUS_TPOWER_PMI, &trans->status)) { 197e705c121SKalle Valo reg = iwl_read32(trans, CSR_UCODE_DRV_GP1); 198e705c121SKalle Valo 199e705c121SKalle Valo if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { 200e705c121SKalle Valo IWL_DEBUG_INFO(trans, "Rx queue requesting wakeup, GP1 = 0x%x\n", 201e705c121SKalle Valo reg); 202e705c121SKalle Valo iwl_set_bit(trans, CSR_GP_CNTRL, 203e705c121SKalle Valo CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); 204e705c121SKalle Valo rxq->need_update = true; 205e705c121SKalle Valo return; 206e705c121SKalle Valo } 207e705c121SKalle Valo } 208e705c121SKalle Valo 209e705c121SKalle Valo rxq->write_actual = round_down(rxq->write, 8); 21096a6497bSSara Sharon if (trans->cfg->mq_rx_supported) 21196a6497bSSara Sharon iwl_write_prph(trans, RFH_Q_FRBDCB_WIDX(rxq->id), 21296a6497bSSara Sharon rxq->write_actual); 21396a6497bSSara Sharon else 214e705c121SKalle Valo iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, rxq->write_actual); 215e705c121SKalle Valo } 216e705c121SKalle Valo 217e705c121SKalle Valo static void iwl_pcie_rxq_check_wrptr(struct iwl_trans *trans) 218e705c121SKalle Valo { 219e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 22078485054SSara Sharon int i; 221e705c121SKalle Valo 22278485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 22378485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 224e705c121SKalle Valo 225e705c121SKalle Valo if (!rxq->need_update) 22678485054SSara Sharon continue; 22778485054SSara Sharon spin_lock(&rxq->lock); 22878485054SSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, rxq); 229e705c121SKalle Valo rxq->need_update = false; 230e705c121SKalle Valo spin_unlock(&rxq->lock); 231e705c121SKalle Valo } 23278485054SSara Sharon } 233e705c121SKalle Valo 234e0e168dcSGregory Greenman /* 235e0e168dcSGregory Greenman * iwl_pcie_rxq_mq_restock - restock implementation for multi-queue rx 236e0e168dcSGregory Greenman */ 23796a6497bSSara Sharon static void iwl_pcie_rxq_mq_restock(struct iwl_trans *trans, 23896a6497bSSara Sharon struct iwl_rxq *rxq) 23996a6497bSSara Sharon { 24096a6497bSSara Sharon struct iwl_rx_mem_buffer *rxb; 24196a6497bSSara Sharon 24296a6497bSSara Sharon /* 24396a6497bSSara Sharon * If the device isn't enabled - no need to try to add buffers... 24496a6497bSSara Sharon * This can happen when we stop the device and still have an interrupt 24596a6497bSSara Sharon * pending. We stop the APM before we sync the interrupts because we 24696a6497bSSara Sharon * have to (see comment there). On the other hand, since the APM is 24796a6497bSSara Sharon * stopped, we cannot access the HW (in particular not prph). 24896a6497bSSara Sharon * So don't try to restock if the APM has been already stopped. 24996a6497bSSara Sharon */ 25096a6497bSSara Sharon if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 25196a6497bSSara Sharon return; 25296a6497bSSara Sharon 25396a6497bSSara Sharon spin_lock(&rxq->lock); 25496a6497bSSara Sharon while (rxq->free_count) { 25596a6497bSSara Sharon __le64 *bd = (__le64 *)rxq->bd; 25696a6497bSSara Sharon 25796a6497bSSara Sharon /* Get next free Rx buffer, remove from free list */ 25896a6497bSSara Sharon rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer, 25996a6497bSSara Sharon list); 26096a6497bSSara Sharon list_del(&rxb->list); 26196a6497bSSara Sharon 26296a6497bSSara Sharon /* 12 first bits are expected to be empty */ 26396a6497bSSara Sharon WARN_ON(rxb->page_dma & DMA_BIT_MASK(12)); 26496a6497bSSara Sharon /* Point to Rx buffer via next RBD in circular buffer */ 26596a6497bSSara Sharon bd[rxq->write] = cpu_to_le64(rxb->page_dma | rxb->vid); 26696a6497bSSara Sharon rxq->write = (rxq->write + 1) & MQ_RX_TABLE_MASK; 26796a6497bSSara Sharon rxq->free_count--; 26896a6497bSSara Sharon } 26996a6497bSSara Sharon spin_unlock(&rxq->lock); 27096a6497bSSara Sharon 27196a6497bSSara Sharon /* 27296a6497bSSara Sharon * If we've added more space for the firmware to place data, tell it. 27396a6497bSSara Sharon * Increment device's write pointer in multiples of 8. 27496a6497bSSara Sharon */ 27596a6497bSSara Sharon if (rxq->write_actual != (rxq->write & ~0x7)) { 27696a6497bSSara Sharon spin_lock(&rxq->lock); 27796a6497bSSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, rxq); 27896a6497bSSara Sharon spin_unlock(&rxq->lock); 27996a6497bSSara Sharon } 28096a6497bSSara Sharon } 28196a6497bSSara Sharon 282e705c121SKalle Valo /* 283e0e168dcSGregory Greenman * iwl_pcie_rxq_sq_restock - restock implementation for single queue rx 284e705c121SKalle Valo */ 285e0e168dcSGregory Greenman static void iwl_pcie_rxq_sq_restock(struct iwl_trans *trans, 286e0e168dcSGregory Greenman struct iwl_rxq *rxq) 287e705c121SKalle Valo { 288e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 289e705c121SKalle Valo 290e705c121SKalle Valo /* 291e705c121SKalle Valo * If the device isn't enabled - not need to try to add buffers... 292e705c121SKalle Valo * This can happen when we stop the device and still have an interrupt 293e705c121SKalle Valo * pending. We stop the APM before we sync the interrupts because we 294e705c121SKalle Valo * have to (see comment there). On the other hand, since the APM is 295e705c121SKalle Valo * stopped, we cannot access the HW (in particular not prph). 296e705c121SKalle Valo * So don't try to restock if the APM has been already stopped. 297e705c121SKalle Valo */ 298e705c121SKalle Valo if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status)) 299e705c121SKalle Valo return; 300e705c121SKalle Valo 301e705c121SKalle Valo spin_lock(&rxq->lock); 302e705c121SKalle Valo while ((iwl_rxq_space(rxq) > 0) && (rxq->free_count)) { 30396a6497bSSara Sharon __le32 *bd = (__le32 *)rxq->bd; 304e705c121SKalle Valo /* The overwritten rxb must be a used one */ 305e705c121SKalle Valo rxb = rxq->queue[rxq->write]; 306e705c121SKalle Valo BUG_ON(rxb && rxb->page); 307e705c121SKalle Valo 308e705c121SKalle Valo /* Get next free Rx buffer, remove from free list */ 309e705c121SKalle Valo rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer, 310e705c121SKalle Valo list); 311e705c121SKalle Valo list_del(&rxb->list); 312e705c121SKalle Valo 313e705c121SKalle Valo /* Point to Rx buffer via next RBD in circular buffer */ 31496a6497bSSara Sharon bd[rxq->write] = iwl_pcie_dma_addr2rbd_ptr(rxb->page_dma); 315e705c121SKalle Valo rxq->queue[rxq->write] = rxb; 316e705c121SKalle Valo rxq->write = (rxq->write + 1) & RX_QUEUE_MASK; 317e705c121SKalle Valo rxq->free_count--; 318e705c121SKalle Valo } 319e705c121SKalle Valo spin_unlock(&rxq->lock); 320e705c121SKalle Valo 321e705c121SKalle Valo /* If we've added more space for the firmware to place data, tell it. 322e705c121SKalle Valo * Increment device's write pointer in multiples of 8. */ 323e705c121SKalle Valo if (rxq->write_actual != (rxq->write & ~0x7)) { 324e705c121SKalle Valo spin_lock(&rxq->lock); 32578485054SSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, rxq); 326e705c121SKalle Valo spin_unlock(&rxq->lock); 327e705c121SKalle Valo } 328e705c121SKalle Valo } 329e705c121SKalle Valo 330e705c121SKalle Valo /* 331e0e168dcSGregory Greenman * iwl_pcie_rxq_restock - refill RX queue from pre-allocated pool 332e0e168dcSGregory Greenman * 333e0e168dcSGregory Greenman * If there are slots in the RX queue that need to be restocked, 334e0e168dcSGregory Greenman * and we have free pre-allocated buffers, fill the ranks as much 335e0e168dcSGregory Greenman * as we can, pulling from rx_free. 336e0e168dcSGregory Greenman * 337e0e168dcSGregory Greenman * This moves the 'write' index forward to catch up with 'processed', and 338e0e168dcSGregory Greenman * also updates the memory address in the firmware to reference the new 339e0e168dcSGregory Greenman * target buffer. 340e0e168dcSGregory Greenman */ 341e0e168dcSGregory Greenman static 342e0e168dcSGregory Greenman void iwl_pcie_rxq_restock(struct iwl_trans *trans, struct iwl_rxq *rxq) 343e0e168dcSGregory Greenman { 344e0e168dcSGregory Greenman if (trans->cfg->mq_rx_supported) 345e0e168dcSGregory Greenman iwl_pcie_rxq_mq_restock(trans, rxq); 346e0e168dcSGregory Greenman else 347e0e168dcSGregory Greenman iwl_pcie_rxq_sq_restock(trans, rxq); 348e0e168dcSGregory Greenman } 349e0e168dcSGregory Greenman 350e0e168dcSGregory Greenman /* 351e705c121SKalle Valo * iwl_pcie_rx_alloc_page - allocates and returns a page. 352e705c121SKalle Valo * 353e705c121SKalle Valo */ 354e705c121SKalle Valo static struct page *iwl_pcie_rx_alloc_page(struct iwl_trans *trans, 355e705c121SKalle Valo gfp_t priority) 356e705c121SKalle Valo { 357e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 358e705c121SKalle Valo struct page *page; 359e705c121SKalle Valo gfp_t gfp_mask = priority; 360e705c121SKalle Valo 361e705c121SKalle Valo if (trans_pcie->rx_page_order > 0) 362e705c121SKalle Valo gfp_mask |= __GFP_COMP; 363e705c121SKalle Valo 364e705c121SKalle Valo /* Alloc a new receive buffer */ 365e705c121SKalle Valo page = alloc_pages(gfp_mask, trans_pcie->rx_page_order); 366e705c121SKalle Valo if (!page) { 367e705c121SKalle Valo if (net_ratelimit()) 368e705c121SKalle Valo IWL_DEBUG_INFO(trans, "alloc_pages failed, order: %d\n", 369e705c121SKalle Valo trans_pcie->rx_page_order); 37078485054SSara Sharon /* 37178485054SSara Sharon * Issue an error if we don't have enough pre-allocated 37278485054SSara Sharon * buffers. 373e705c121SKalle Valo ` */ 37478485054SSara Sharon if (!(gfp_mask & __GFP_NOWARN) && net_ratelimit()) 375e705c121SKalle Valo IWL_CRIT(trans, 37678485054SSara Sharon "Failed to alloc_pages\n"); 377e705c121SKalle Valo return NULL; 378e705c121SKalle Valo } 379e705c121SKalle Valo return page; 380e705c121SKalle Valo } 381e705c121SKalle Valo 382e705c121SKalle Valo /* 383e705c121SKalle Valo * iwl_pcie_rxq_alloc_rbs - allocate a page for each used RBD 384e705c121SKalle Valo * 385e705c121SKalle Valo * A used RBD is an Rx buffer that has been given to the stack. To use it again 386e705c121SKalle Valo * a page must be allocated and the RBD must point to the page. This function 387e705c121SKalle Valo * doesn't change the HW pointer but handles the list of pages that is used by 388e705c121SKalle Valo * iwl_pcie_rxq_restock. The latter function will update the HW to use the newly 389e705c121SKalle Valo * allocated buffers. 390e705c121SKalle Valo */ 39178485054SSara Sharon static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority, 39278485054SSara Sharon struct iwl_rxq *rxq) 393e705c121SKalle Valo { 394e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 395e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 396e705c121SKalle Valo struct page *page; 397e705c121SKalle Valo 398e705c121SKalle Valo while (1) { 399e705c121SKalle Valo spin_lock(&rxq->lock); 400e705c121SKalle Valo if (list_empty(&rxq->rx_used)) { 401e705c121SKalle Valo spin_unlock(&rxq->lock); 402e705c121SKalle Valo return; 403e705c121SKalle Valo } 404e705c121SKalle Valo spin_unlock(&rxq->lock); 405e705c121SKalle Valo 406e705c121SKalle Valo /* Alloc a new receive buffer */ 407e705c121SKalle Valo page = iwl_pcie_rx_alloc_page(trans, priority); 408e705c121SKalle Valo if (!page) 409e705c121SKalle Valo return; 410e705c121SKalle Valo 411e705c121SKalle Valo spin_lock(&rxq->lock); 412e705c121SKalle Valo 413e705c121SKalle Valo if (list_empty(&rxq->rx_used)) { 414e705c121SKalle Valo spin_unlock(&rxq->lock); 415e705c121SKalle Valo __free_pages(page, trans_pcie->rx_page_order); 416e705c121SKalle Valo return; 417e705c121SKalle Valo } 418e705c121SKalle Valo rxb = list_first_entry(&rxq->rx_used, struct iwl_rx_mem_buffer, 419e705c121SKalle Valo list); 420e705c121SKalle Valo list_del(&rxb->list); 421e705c121SKalle Valo spin_unlock(&rxq->lock); 422e705c121SKalle Valo 423e705c121SKalle Valo BUG_ON(rxb->page); 424e705c121SKalle Valo rxb->page = page; 425e705c121SKalle Valo /* Get physical address of the RB */ 426e705c121SKalle Valo rxb->page_dma = 427e705c121SKalle Valo dma_map_page(trans->dev, page, 0, 428e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 429e705c121SKalle Valo DMA_FROM_DEVICE); 430e705c121SKalle Valo if (dma_mapping_error(trans->dev, rxb->page_dma)) { 431e705c121SKalle Valo rxb->page = NULL; 432e705c121SKalle Valo spin_lock(&rxq->lock); 433e705c121SKalle Valo list_add(&rxb->list, &rxq->rx_used); 434e705c121SKalle Valo spin_unlock(&rxq->lock); 435e705c121SKalle Valo __free_pages(page, trans_pcie->rx_page_order); 436e705c121SKalle Valo return; 437e705c121SKalle Valo } 438e705c121SKalle Valo 439e705c121SKalle Valo spin_lock(&rxq->lock); 440e705c121SKalle Valo 441e705c121SKalle Valo list_add_tail(&rxb->list, &rxq->rx_free); 442e705c121SKalle Valo rxq->free_count++; 443e705c121SKalle Valo 444e705c121SKalle Valo spin_unlock(&rxq->lock); 445e705c121SKalle Valo } 446e705c121SKalle Valo } 447e705c121SKalle Valo 44878485054SSara Sharon static void iwl_pcie_free_rbs_pool(struct iwl_trans *trans) 449e705c121SKalle Valo { 450e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 451e705c121SKalle Valo int i; 452e705c121SKalle Valo 4537b542436SSara Sharon for (i = 0; i < RX_POOL_SIZE; i++) { 45478485054SSara Sharon if (!trans_pcie->rx_pool[i].page) 455e705c121SKalle Valo continue; 45678485054SSara Sharon dma_unmap_page(trans->dev, trans_pcie->rx_pool[i].page_dma, 457e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 458e705c121SKalle Valo DMA_FROM_DEVICE); 45978485054SSara Sharon __free_pages(trans_pcie->rx_pool[i].page, 46078485054SSara Sharon trans_pcie->rx_page_order); 46178485054SSara Sharon trans_pcie->rx_pool[i].page = NULL; 462e705c121SKalle Valo } 463e705c121SKalle Valo } 464e705c121SKalle Valo 465e705c121SKalle Valo /* 466e705c121SKalle Valo * iwl_pcie_rx_allocator - Allocates pages in the background for RX queues 467e705c121SKalle Valo * 468e705c121SKalle Valo * Allocates for each received request 8 pages 469e705c121SKalle Valo * Called as a scheduled work item. 470e705c121SKalle Valo */ 471e705c121SKalle Valo static void iwl_pcie_rx_allocator(struct iwl_trans *trans) 472e705c121SKalle Valo { 473e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 474e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 475e705c121SKalle Valo struct list_head local_empty; 476e705c121SKalle Valo int pending = atomic_xchg(&rba->req_pending, 0); 477e705c121SKalle Valo 478e705c121SKalle Valo IWL_DEBUG_RX(trans, "Pending allocation requests = %d\n", pending); 479e705c121SKalle Valo 480e705c121SKalle Valo /* If we were scheduled - there is at least one request */ 481e705c121SKalle Valo spin_lock(&rba->lock); 482e705c121SKalle Valo /* swap out the rba->rbd_empty to a local list */ 483e705c121SKalle Valo list_replace_init(&rba->rbd_empty, &local_empty); 484e705c121SKalle Valo spin_unlock(&rba->lock); 485e705c121SKalle Valo 486e705c121SKalle Valo while (pending) { 487e705c121SKalle Valo int i; 488e705c121SKalle Valo struct list_head local_allocated; 48978485054SSara Sharon gfp_t gfp_mask = GFP_KERNEL; 49078485054SSara Sharon 49178485054SSara Sharon /* Do not post a warning if there are only a few requests */ 49278485054SSara Sharon if (pending < RX_PENDING_WATERMARK) 49378485054SSara Sharon gfp_mask |= __GFP_NOWARN; 494e705c121SKalle Valo 495e705c121SKalle Valo INIT_LIST_HEAD(&local_allocated); 496e705c121SKalle Valo 497e705c121SKalle Valo for (i = 0; i < RX_CLAIM_REQ_ALLOC;) { 498e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 499e705c121SKalle Valo struct page *page; 500e705c121SKalle Valo 501e705c121SKalle Valo /* List should never be empty - each reused RBD is 502e705c121SKalle Valo * returned to the list, and initial pool covers any 503e705c121SKalle Valo * possible gap between the time the page is allocated 504e705c121SKalle Valo * to the time the RBD is added. 505e705c121SKalle Valo */ 506e705c121SKalle Valo BUG_ON(list_empty(&local_empty)); 507e705c121SKalle Valo /* Get the first rxb from the rbd list */ 508e705c121SKalle Valo rxb = list_first_entry(&local_empty, 509e705c121SKalle Valo struct iwl_rx_mem_buffer, list); 510e705c121SKalle Valo BUG_ON(rxb->page); 511e705c121SKalle Valo 512e705c121SKalle Valo /* Alloc a new receive buffer */ 51378485054SSara Sharon page = iwl_pcie_rx_alloc_page(trans, gfp_mask); 514e705c121SKalle Valo if (!page) 515e705c121SKalle Valo continue; 516e705c121SKalle Valo rxb->page = page; 517e705c121SKalle Valo 518e705c121SKalle Valo /* Get physical address of the RB */ 519e705c121SKalle Valo rxb->page_dma = dma_map_page(trans->dev, page, 0, 520e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 521e705c121SKalle Valo DMA_FROM_DEVICE); 522e705c121SKalle Valo if (dma_mapping_error(trans->dev, rxb->page_dma)) { 523e705c121SKalle Valo rxb->page = NULL; 524e705c121SKalle Valo __free_pages(page, trans_pcie->rx_page_order); 525e705c121SKalle Valo continue; 526e705c121SKalle Valo } 527e705c121SKalle Valo 528e705c121SKalle Valo /* move the allocated entry to the out list */ 529e705c121SKalle Valo list_move(&rxb->list, &local_allocated); 530e705c121SKalle Valo i++; 531e705c121SKalle Valo } 532e705c121SKalle Valo 533e705c121SKalle Valo pending--; 534e705c121SKalle Valo if (!pending) { 535e705c121SKalle Valo pending = atomic_xchg(&rba->req_pending, 0); 536e705c121SKalle Valo IWL_DEBUG_RX(trans, 537e705c121SKalle Valo "Pending allocation requests = %d\n", 538e705c121SKalle Valo pending); 539e705c121SKalle Valo } 540e705c121SKalle Valo 541e705c121SKalle Valo spin_lock(&rba->lock); 542e705c121SKalle Valo /* add the allocated rbds to the allocator allocated list */ 543e705c121SKalle Valo list_splice_tail(&local_allocated, &rba->rbd_allocated); 544e705c121SKalle Valo /* get more empty RBDs for current pending requests */ 545e705c121SKalle Valo list_splice_tail_init(&rba->rbd_empty, &local_empty); 546e705c121SKalle Valo spin_unlock(&rba->lock); 547e705c121SKalle Valo 548e705c121SKalle Valo atomic_inc(&rba->req_ready); 549e705c121SKalle Valo } 550e705c121SKalle Valo 551e705c121SKalle Valo spin_lock(&rba->lock); 552e705c121SKalle Valo /* return unused rbds to the allocator empty list */ 553e705c121SKalle Valo list_splice_tail(&local_empty, &rba->rbd_empty); 554e705c121SKalle Valo spin_unlock(&rba->lock); 555e705c121SKalle Valo } 556e705c121SKalle Valo 557e705c121SKalle Valo /* 558d56daea4SSara Sharon * iwl_pcie_rx_allocator_get - returns the pre-allocated pages 559e705c121SKalle Valo .* 560e705c121SKalle Valo .* Called by queue when the queue posted allocation request and 561e705c121SKalle Valo * has freed 8 RBDs in order to restock itself. 562d56daea4SSara Sharon * This function directly moves the allocated RBs to the queue's ownership 563d56daea4SSara Sharon * and updates the relevant counters. 564e705c121SKalle Valo */ 565d56daea4SSara Sharon static void iwl_pcie_rx_allocator_get(struct iwl_trans *trans, 566d56daea4SSara Sharon struct iwl_rxq *rxq) 567e705c121SKalle Valo { 568e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 569e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 570e705c121SKalle Valo int i; 571e705c121SKalle Valo 572d56daea4SSara Sharon lockdep_assert_held(&rxq->lock); 573d56daea4SSara Sharon 574e705c121SKalle Valo /* 575e705c121SKalle Valo * atomic_dec_if_positive returns req_ready - 1 for any scenario. 576e705c121SKalle Valo * If req_ready is 0 atomic_dec_if_positive will return -1 and this 577d56daea4SSara Sharon * function will return early, as there are no ready requests. 578e705c121SKalle Valo * atomic_dec_if_positive will perofrm the *actual* decrement only if 579e705c121SKalle Valo * req_ready > 0, i.e. - there are ready requests and the function 580e705c121SKalle Valo * hands one request to the caller. 581e705c121SKalle Valo */ 582e705c121SKalle Valo if (atomic_dec_if_positive(&rba->req_ready) < 0) 583d56daea4SSara Sharon return; 584e705c121SKalle Valo 585e705c121SKalle Valo spin_lock(&rba->lock); 586e705c121SKalle Valo for (i = 0; i < RX_CLAIM_REQ_ALLOC; i++) { 587e705c121SKalle Valo /* Get next free Rx buffer, remove it from free list */ 588d56daea4SSara Sharon struct iwl_rx_mem_buffer *rxb = 589d56daea4SSara Sharon list_first_entry(&rba->rbd_allocated, 590e705c121SKalle Valo struct iwl_rx_mem_buffer, list); 591d56daea4SSara Sharon 592d56daea4SSara Sharon list_move(&rxb->list, &rxq->rx_free); 593e705c121SKalle Valo } 594e705c121SKalle Valo spin_unlock(&rba->lock); 595e705c121SKalle Valo 596d56daea4SSara Sharon rxq->used_count -= RX_CLAIM_REQ_ALLOC; 597d56daea4SSara Sharon rxq->free_count += RX_CLAIM_REQ_ALLOC; 598e705c121SKalle Valo } 599e705c121SKalle Valo 600e705c121SKalle Valo static void iwl_pcie_rx_allocator_work(struct work_struct *data) 601e705c121SKalle Valo { 602e705c121SKalle Valo struct iwl_rb_allocator *rba_p = 603e705c121SKalle Valo container_of(data, struct iwl_rb_allocator, rx_alloc); 604e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = 605e705c121SKalle Valo container_of(rba_p, struct iwl_trans_pcie, rba); 606e705c121SKalle Valo 607e705c121SKalle Valo iwl_pcie_rx_allocator(trans_pcie->trans); 608e705c121SKalle Valo } 609e705c121SKalle Valo 610e705c121SKalle Valo static int iwl_pcie_rx_alloc(struct iwl_trans *trans) 611e705c121SKalle Valo { 612e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 613e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 614e705c121SKalle Valo struct device *dev = trans->dev; 61578485054SSara Sharon int i; 61696a6497bSSara Sharon int free_size = trans->cfg->mq_rx_supported ? sizeof(__le64) : 61796a6497bSSara Sharon sizeof(__le32); 618e705c121SKalle Valo 61978485054SSara Sharon if (WARN_ON(trans_pcie->rxq)) 620e705c121SKalle Valo return -EINVAL; 621e705c121SKalle Valo 62278485054SSara Sharon trans_pcie->rxq = kcalloc(trans->num_rx_queues, sizeof(struct iwl_rxq), 62378485054SSara Sharon GFP_KERNEL); 62478485054SSara Sharon if (!trans_pcie->rxq) 62578485054SSara Sharon return -EINVAL; 62678485054SSara Sharon 62778485054SSara Sharon spin_lock_init(&rba->lock); 62878485054SSara Sharon 62978485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 63078485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 63178485054SSara Sharon 63278485054SSara Sharon spin_lock_init(&rxq->lock); 63396a6497bSSara Sharon if (trans->cfg->mq_rx_supported) 63496a6497bSSara Sharon rxq->queue_size = MQ_RX_TABLE_SIZE; 63596a6497bSSara Sharon else 63696a6497bSSara Sharon rxq->queue_size = RX_QUEUE_SIZE; 63796a6497bSSara Sharon 63878485054SSara Sharon /* 63978485054SSara Sharon * Allocate the circular buffer of Read Buffer Descriptors 64078485054SSara Sharon * (RBDs) 64178485054SSara Sharon */ 64278485054SSara Sharon rxq->bd = dma_zalloc_coherent(dev, 64396a6497bSSara Sharon free_size * rxq->queue_size, 644e705c121SKalle Valo &rxq->bd_dma, GFP_KERNEL); 645e705c121SKalle Valo if (!rxq->bd) 64678485054SSara Sharon goto err; 64778485054SSara Sharon 64896a6497bSSara Sharon if (trans->cfg->mq_rx_supported) { 64996a6497bSSara Sharon rxq->used_bd = dma_zalloc_coherent(dev, 65096a6497bSSara Sharon sizeof(__le32) * 65196a6497bSSara Sharon rxq->queue_size, 65296a6497bSSara Sharon &rxq->used_bd_dma, 65396a6497bSSara Sharon GFP_KERNEL); 65496a6497bSSara Sharon if (!rxq->used_bd) 65596a6497bSSara Sharon goto err; 65696a6497bSSara Sharon } 657e705c121SKalle Valo 658e705c121SKalle Valo /*Allocate the driver's pointer to receive buffer status */ 659e705c121SKalle Valo rxq->rb_stts = dma_zalloc_coherent(dev, sizeof(*rxq->rb_stts), 66078485054SSara Sharon &rxq->rb_stts_dma, 66178485054SSara Sharon GFP_KERNEL); 662e705c121SKalle Valo if (!rxq->rb_stts) 66378485054SSara Sharon goto err; 66478485054SSara Sharon } 665e705c121SKalle Valo return 0; 666e705c121SKalle Valo 66778485054SSara Sharon err: 66878485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 66978485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 67078485054SSara Sharon 67178485054SSara Sharon if (rxq->bd) 67296a6497bSSara Sharon dma_free_coherent(dev, free_size * rxq->queue_size, 673e705c121SKalle Valo rxq->bd, rxq->bd_dma); 674e705c121SKalle Valo rxq->bd_dma = 0; 675e705c121SKalle Valo rxq->bd = NULL; 67678485054SSara Sharon 67778485054SSara Sharon if (rxq->rb_stts) 67878485054SSara Sharon dma_free_coherent(trans->dev, 67978485054SSara Sharon sizeof(struct iwl_rb_status), 68078485054SSara Sharon rxq->rb_stts, rxq->rb_stts_dma); 68196a6497bSSara Sharon 68296a6497bSSara Sharon if (rxq->used_bd) 68396a6497bSSara Sharon dma_free_coherent(dev, sizeof(__le32) * rxq->queue_size, 68496a6497bSSara Sharon rxq->used_bd, rxq->used_bd_dma); 68596a6497bSSara Sharon rxq->used_bd_dma = 0; 68696a6497bSSara Sharon rxq->used_bd = NULL; 68778485054SSara Sharon } 68878485054SSara Sharon kfree(trans_pcie->rxq); 68996a6497bSSara Sharon 690e705c121SKalle Valo return -ENOMEM; 691e705c121SKalle Valo } 692e705c121SKalle Valo 693e705c121SKalle Valo static void iwl_pcie_rx_hw_init(struct iwl_trans *trans, struct iwl_rxq *rxq) 694e705c121SKalle Valo { 695e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 696e705c121SKalle Valo u32 rb_size; 697e705c121SKalle Valo const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */ 698e705c121SKalle Valo 6996c4fbcbcSEmmanuel Grumbach switch (trans_pcie->rx_buf_size) { 7006c4fbcbcSEmmanuel Grumbach case IWL_AMSDU_4K: 701e705c121SKalle Valo rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K; 7026c4fbcbcSEmmanuel Grumbach break; 7036c4fbcbcSEmmanuel Grumbach case IWL_AMSDU_8K: 7046c4fbcbcSEmmanuel Grumbach rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K; 7056c4fbcbcSEmmanuel Grumbach break; 7066c4fbcbcSEmmanuel Grumbach case IWL_AMSDU_12K: 7076c4fbcbcSEmmanuel Grumbach rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_12K; 7086c4fbcbcSEmmanuel Grumbach break; 7096c4fbcbcSEmmanuel Grumbach default: 7106c4fbcbcSEmmanuel Grumbach WARN_ON(1); 7116c4fbcbcSEmmanuel Grumbach rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K; 7126c4fbcbcSEmmanuel Grumbach } 713e705c121SKalle Valo 714e705c121SKalle Valo /* Stop Rx DMA */ 715e705c121SKalle Valo iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0); 716e705c121SKalle Valo /* reset and flush pointers */ 717e705c121SKalle Valo iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_RBDCB_WPTR, 0); 718e705c121SKalle Valo iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_FLUSH_RB_REQ, 0); 719e705c121SKalle Valo iwl_write_direct32(trans, FH_RSCSR_CHNL0_RDPTR, 0); 720e705c121SKalle Valo 721e705c121SKalle Valo /* Reset driver's Rx queue write index */ 722e705c121SKalle Valo iwl_write_direct32(trans, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0); 723e705c121SKalle Valo 724e705c121SKalle Valo /* Tell device where to find RBD circular buffer in DRAM */ 725e705c121SKalle Valo iwl_write_direct32(trans, FH_RSCSR_CHNL0_RBDCB_BASE_REG, 726e705c121SKalle Valo (u32)(rxq->bd_dma >> 8)); 727e705c121SKalle Valo 728e705c121SKalle Valo /* Tell device where in DRAM to update its Rx status */ 729e705c121SKalle Valo iwl_write_direct32(trans, FH_RSCSR_CHNL0_STTS_WPTR_REG, 730e705c121SKalle Valo rxq->rb_stts_dma >> 4); 731e705c121SKalle Valo 732e705c121SKalle Valo /* Enable Rx DMA 733e705c121SKalle Valo * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in 734e705c121SKalle Valo * the credit mechanism in 5000 HW RX FIFO 735e705c121SKalle Valo * Direct rx interrupts to hosts 7366c4fbcbcSEmmanuel Grumbach * Rx buffer size 4 or 8k or 12k 737e705c121SKalle Valo * RB timeout 0x10 738e705c121SKalle Valo * 256 RBDs 739e705c121SKalle Valo */ 740e705c121SKalle Valo iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 741e705c121SKalle Valo FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL | 742e705c121SKalle Valo FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY | 743e705c121SKalle Valo FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL | 744e705c121SKalle Valo rb_size| 745e705c121SKalle Valo (RX_RB_TIMEOUT << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)| 746e705c121SKalle Valo (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS)); 747e705c121SKalle Valo 748e705c121SKalle Valo /* Set interrupt coalescing timer to default (2048 usecs) */ 749e705c121SKalle Valo iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF); 750e705c121SKalle Valo 751e705c121SKalle Valo /* W/A for interrupt coalescing bug in 7260 and 3160 */ 752e705c121SKalle Valo if (trans->cfg->host_interrupt_operation_mode) 753e705c121SKalle Valo iwl_set_bit(trans, CSR_INT_COALESCING, IWL_HOST_INT_OPER_MODE); 754e705c121SKalle Valo } 755e705c121SKalle Valo 756bce97731SSara Sharon static void iwl_pcie_rx_mq_hw_init(struct iwl_trans *trans) 75796a6497bSSara Sharon { 75896a6497bSSara Sharon struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 75996a6497bSSara Sharon u32 rb_size, enabled = 0; 76096a6497bSSara Sharon int i; 76196a6497bSSara Sharon 76296a6497bSSara Sharon switch (trans_pcie->rx_buf_size) { 76396a6497bSSara Sharon case IWL_AMSDU_4K: 76496a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_4K; 76596a6497bSSara Sharon break; 76696a6497bSSara Sharon case IWL_AMSDU_8K: 76796a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_8K; 76896a6497bSSara Sharon break; 76996a6497bSSara Sharon case IWL_AMSDU_12K: 77096a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_12K; 77196a6497bSSara Sharon break; 77296a6497bSSara Sharon default: 77396a6497bSSara Sharon WARN_ON(1); 77496a6497bSSara Sharon rb_size = RFH_RXF_DMA_RB_SIZE_4K; 77596a6497bSSara Sharon } 77696a6497bSSara Sharon 77796a6497bSSara Sharon /* Stop Rx DMA */ 77896a6497bSSara Sharon iwl_write_prph(trans, RFH_RXF_DMA_CFG, 0); 77996a6497bSSara Sharon /* disable free amd used rx queue operation */ 78096a6497bSSara Sharon iwl_write_prph(trans, RFH_RXF_RXQ_ACTIVE, 0); 78196a6497bSSara Sharon 78296a6497bSSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 78396a6497bSSara Sharon /* Tell device where to find RBD free table in DRAM */ 78496a6497bSSara Sharon iwl_pcie_write_prph_64(trans, RFH_Q_FRBDCB_BA_LSB(i), 785bce97731SSara Sharon (u64)(trans_pcie->rxq[i].bd_dma)); 78696a6497bSSara Sharon /* Tell device where to find RBD used table in DRAM */ 78796a6497bSSara Sharon iwl_pcie_write_prph_64(trans, RFH_Q_URBDCB_BA_LSB(i), 788bce97731SSara Sharon (u64)(trans_pcie->rxq[i].used_bd_dma)); 78996a6497bSSara Sharon /* Tell device where in DRAM to update its Rx status */ 79096a6497bSSara Sharon iwl_pcie_write_prph_64(trans, RFH_Q_URBD_STTS_WPTR_LSB(i), 791bce97731SSara Sharon trans_pcie->rxq[i].rb_stts_dma); 79296a6497bSSara Sharon /* Reset device indice tables */ 79396a6497bSSara Sharon iwl_write_prph(trans, RFH_Q_FRBDCB_WIDX(i), 0); 79496a6497bSSara Sharon iwl_write_prph(trans, RFH_Q_FRBDCB_RIDX(i), 0); 79596a6497bSSara Sharon iwl_write_prph(trans, RFH_Q_URBDCB_WIDX(i), 0); 79696a6497bSSara Sharon 79796a6497bSSara Sharon enabled |= BIT(i) | BIT(i + 16); 79896a6497bSSara Sharon } 79996a6497bSSara Sharon 80096a6497bSSara Sharon /* restock default queue */ 80196a6497bSSara Sharon iwl_pcie_rxq_mq_restock(trans, &trans_pcie->rxq[0]); 80296a6497bSSara Sharon 80396a6497bSSara Sharon /* 80496a6497bSSara Sharon * Enable Rx DMA 80596a6497bSSara Sharon * Single frame mode 80696a6497bSSara Sharon * Rx buffer size 4 or 8k or 12k 80796a6497bSSara Sharon * Min RB size 4 or 8 80888076015SSara Sharon * Drop frames that exceed RB size 80996a6497bSSara Sharon * 512 RBDs 81096a6497bSSara Sharon */ 81196a6497bSSara Sharon iwl_write_prph(trans, RFH_RXF_DMA_CFG, 81296a6497bSSara Sharon RFH_DMA_EN_ENABLE_VAL | 81396a6497bSSara Sharon rb_size | RFH_RXF_DMA_SINGLE_FRAME_MASK | 81496a6497bSSara Sharon RFH_RXF_DMA_MIN_RB_4_8 | 81588076015SSara Sharon RFH_RXF_DMA_DROP_TOO_LARGE_MASK | 81696a6497bSSara Sharon RFH_RXF_DMA_RBDCB_SIZE_512); 81796a6497bSSara Sharon 81888076015SSara Sharon /* 81988076015SSara Sharon * Activate DMA snooping. 820e5f91d91SSara Sharon * Set RX DMA chunk size to 64B 82188076015SSara Sharon * Default queue is 0 82288076015SSara Sharon */ 82396a6497bSSara Sharon iwl_write_prph(trans, RFH_GEN_CFG, RFH_GEN_CFG_RFH_DMA_SNOOP | 82488076015SSara Sharon (DEFAULT_RXQ_NUM << RFH_GEN_CFG_DEFAULT_RXQ_NUM_POS) | 82596a6497bSSara Sharon RFH_GEN_CFG_SERVICE_DMA_SNOOP); 82688076015SSara Sharon /* Enable the relevant rx queues */ 82796a6497bSSara Sharon iwl_write_prph(trans, RFH_RXF_RXQ_ACTIVE, enabled); 82896a6497bSSara Sharon 82996a6497bSSara Sharon /* Set interrupt coalescing timer to default (2048 usecs) */ 83096a6497bSSara Sharon iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF); 83196a6497bSSara Sharon } 83296a6497bSSara Sharon 833e705c121SKalle Valo static void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq) 834e705c121SKalle Valo { 835e705c121SKalle Valo lockdep_assert_held(&rxq->lock); 836e705c121SKalle Valo 837e705c121SKalle Valo INIT_LIST_HEAD(&rxq->rx_free); 838e705c121SKalle Valo INIT_LIST_HEAD(&rxq->rx_used); 839e705c121SKalle Valo rxq->free_count = 0; 840e705c121SKalle Valo rxq->used_count = 0; 841e705c121SKalle Valo } 842e705c121SKalle Valo 843bce97731SSara Sharon static int iwl_pcie_dummy_napi_poll(struct napi_struct *napi, int budget) 844bce97731SSara Sharon { 845bce97731SSara Sharon WARN_ON(1); 846bce97731SSara Sharon return 0; 847bce97731SSara Sharon } 848bce97731SSara Sharon 849e705c121SKalle Valo int iwl_pcie_rx_init(struct iwl_trans *trans) 850e705c121SKalle Valo { 851e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 85278485054SSara Sharon struct iwl_rxq *def_rxq; 853e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 8547b542436SSara Sharon int i, err, queue_size, allocator_pool_size, num_alloc; 855e705c121SKalle Valo 85678485054SSara Sharon if (!trans_pcie->rxq) { 857e705c121SKalle Valo err = iwl_pcie_rx_alloc(trans); 858e705c121SKalle Valo if (err) 859e705c121SKalle Valo return err; 860e705c121SKalle Valo } 86178485054SSara Sharon def_rxq = trans_pcie->rxq; 862e705c121SKalle Valo if (!rba->alloc_wq) 863e705c121SKalle Valo rba->alloc_wq = alloc_workqueue("rb_allocator", 864e705c121SKalle Valo WQ_HIGHPRI | WQ_UNBOUND, 1); 865e705c121SKalle Valo INIT_WORK(&rba->rx_alloc, iwl_pcie_rx_allocator_work); 866e705c121SKalle Valo 867e705c121SKalle Valo spin_lock(&rba->lock); 868e705c121SKalle Valo atomic_set(&rba->req_pending, 0); 869e705c121SKalle Valo atomic_set(&rba->req_ready, 0); 87096a6497bSSara Sharon INIT_LIST_HEAD(&rba->rbd_allocated); 87196a6497bSSara Sharon INIT_LIST_HEAD(&rba->rbd_empty); 872e705c121SKalle Valo spin_unlock(&rba->lock); 873e705c121SKalle Valo 874e705c121SKalle Valo /* free all first - we might be reconfigured for a different size */ 87578485054SSara Sharon iwl_pcie_free_rbs_pool(trans); 876e705c121SKalle Valo 877e705c121SKalle Valo for (i = 0; i < RX_QUEUE_SIZE; i++) 87878485054SSara Sharon def_rxq->queue[i] = NULL; 879e705c121SKalle Valo 88078485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 88178485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 882e705c121SKalle Valo 88396a6497bSSara Sharon rxq->id = i; 88496a6497bSSara Sharon 885e705c121SKalle Valo spin_lock(&rxq->lock); 88678485054SSara Sharon /* 88778485054SSara Sharon * Set read write pointer to reflect that we have processed 88878485054SSara Sharon * and used all buffers, but have not restocked the Rx queue 88978485054SSara Sharon * with fresh buffers 89078485054SSara Sharon */ 89178485054SSara Sharon rxq->read = 0; 89278485054SSara Sharon rxq->write = 0; 89378485054SSara Sharon rxq->write_actual = 0; 89478485054SSara Sharon memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts)); 89578485054SSara Sharon 89678485054SSara Sharon iwl_pcie_rx_init_rxb_lists(rxq); 89778485054SSara Sharon 898bce97731SSara Sharon if (!rxq->napi.poll) 899bce97731SSara Sharon netif_napi_add(&trans_pcie->napi_dev, &rxq->napi, 900bce97731SSara Sharon iwl_pcie_dummy_napi_poll, 64); 901bce97731SSara Sharon 902e705c121SKalle Valo spin_unlock(&rxq->lock); 90378485054SSara Sharon } 90478485054SSara Sharon 90596a6497bSSara Sharon /* move the pool to the default queue and allocator ownerships */ 9067b542436SSara Sharon queue_size = trans->cfg->mq_rx_supported ? 9077b542436SSara Sharon MQ_RX_NUM_RBDS : RX_QUEUE_SIZE; 90896a6497bSSara Sharon allocator_pool_size = trans->num_rx_queues * 90996a6497bSSara Sharon (RX_CLAIM_REQ_ALLOC - RX_POST_REQ_ALLOC); 9107b542436SSara Sharon num_alloc = queue_size + allocator_pool_size; 9117b542436SSara Sharon for (i = 0; i < num_alloc; i++) { 91296a6497bSSara Sharon struct iwl_rx_mem_buffer *rxb = &trans_pcie->rx_pool[i]; 91396a6497bSSara Sharon 91496a6497bSSara Sharon if (i < allocator_pool_size) 91596a6497bSSara Sharon list_add(&rxb->list, &rba->rbd_empty); 91696a6497bSSara Sharon else 91796a6497bSSara Sharon list_add(&rxb->list, &def_rxq->rx_used); 91896a6497bSSara Sharon trans_pcie->global_table[i] = rxb; 91996a6497bSSara Sharon rxb->vid = (u16)i; 92096a6497bSSara Sharon } 92178485054SSara Sharon 92278485054SSara Sharon iwl_pcie_rxq_alloc_rbs(trans, GFP_KERNEL, def_rxq); 92396a6497bSSara Sharon if (trans->cfg->mq_rx_supported) { 924bce97731SSara Sharon iwl_pcie_rx_mq_hw_init(trans); 92596a6497bSSara Sharon } else { 926e0e168dcSGregory Greenman iwl_pcie_rxq_sq_restock(trans, def_rxq); 92778485054SSara Sharon iwl_pcie_rx_hw_init(trans, def_rxq); 92896a6497bSSara Sharon } 92978485054SSara Sharon 93078485054SSara Sharon spin_lock(&def_rxq->lock); 93178485054SSara Sharon iwl_pcie_rxq_inc_wr_ptr(trans, def_rxq); 93278485054SSara Sharon spin_unlock(&def_rxq->lock); 933e705c121SKalle Valo 934e705c121SKalle Valo return 0; 935e705c121SKalle Valo } 936e705c121SKalle Valo 937e705c121SKalle Valo void iwl_pcie_rx_free(struct iwl_trans *trans) 938e705c121SKalle Valo { 939e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 940e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 94196a6497bSSara Sharon int free_size = trans->cfg->mq_rx_supported ? sizeof(__le64) : 94296a6497bSSara Sharon sizeof(__le32); 94378485054SSara Sharon int i; 944e705c121SKalle Valo 94578485054SSara Sharon /* 94678485054SSara Sharon * if rxq is NULL, it means that nothing has been allocated, 94778485054SSara Sharon * exit now 94878485054SSara Sharon */ 94978485054SSara Sharon if (!trans_pcie->rxq) { 950e705c121SKalle Valo IWL_DEBUG_INFO(trans, "Free NULL rx context\n"); 951e705c121SKalle Valo return; 952e705c121SKalle Valo } 953e705c121SKalle Valo 954e705c121SKalle Valo cancel_work_sync(&rba->rx_alloc); 955e705c121SKalle Valo if (rba->alloc_wq) { 956e705c121SKalle Valo destroy_workqueue(rba->alloc_wq); 957e705c121SKalle Valo rba->alloc_wq = NULL; 958e705c121SKalle Valo } 959e705c121SKalle Valo 96078485054SSara Sharon iwl_pcie_free_rbs_pool(trans); 961e705c121SKalle Valo 96278485054SSara Sharon for (i = 0; i < trans->num_rx_queues; i++) { 96378485054SSara Sharon struct iwl_rxq *rxq = &trans_pcie->rxq[i]; 96478485054SSara Sharon 96578485054SSara Sharon if (rxq->bd) 96678485054SSara Sharon dma_free_coherent(trans->dev, 96796a6497bSSara Sharon free_size * rxq->queue_size, 968e705c121SKalle Valo rxq->bd, rxq->bd_dma); 969e705c121SKalle Valo rxq->bd_dma = 0; 970e705c121SKalle Valo rxq->bd = NULL; 971e705c121SKalle Valo 972e705c121SKalle Valo if (rxq->rb_stts) 973e705c121SKalle Valo dma_free_coherent(trans->dev, 974e705c121SKalle Valo sizeof(struct iwl_rb_status), 975e705c121SKalle Valo rxq->rb_stts, rxq->rb_stts_dma); 976e705c121SKalle Valo else 97778485054SSara Sharon IWL_DEBUG_INFO(trans, 97878485054SSara Sharon "Free rxq->rb_stts which is NULL\n"); 97978485054SSara Sharon 98096a6497bSSara Sharon if (rxq->used_bd) 98196a6497bSSara Sharon dma_free_coherent(trans->dev, 98296a6497bSSara Sharon sizeof(__le32) * rxq->queue_size, 98396a6497bSSara Sharon rxq->used_bd, rxq->used_bd_dma); 98496a6497bSSara Sharon rxq->used_bd_dma = 0; 98596a6497bSSara Sharon rxq->used_bd = NULL; 986bce97731SSara Sharon 987bce97731SSara Sharon if (rxq->napi.poll) 988bce97731SSara Sharon netif_napi_del(&rxq->napi); 98996a6497bSSara Sharon } 99078485054SSara Sharon kfree(trans_pcie->rxq); 991e705c121SKalle Valo } 992e705c121SKalle Valo 993e705c121SKalle Valo /* 994e705c121SKalle Valo * iwl_pcie_rx_reuse_rbd - Recycle used RBDs 995e705c121SKalle Valo * 996e705c121SKalle Valo * Called when a RBD can be reused. The RBD is transferred to the allocator. 997e705c121SKalle Valo * When there are 2 empty RBDs - a request for allocation is posted 998e705c121SKalle Valo */ 999e705c121SKalle Valo static void iwl_pcie_rx_reuse_rbd(struct iwl_trans *trans, 1000e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb, 1001e705c121SKalle Valo struct iwl_rxq *rxq, bool emergency) 1002e705c121SKalle Valo { 1003e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1004e705c121SKalle Valo struct iwl_rb_allocator *rba = &trans_pcie->rba; 1005e705c121SKalle Valo 1006e705c121SKalle Valo /* Move the RBD to the used list, will be moved to allocator in batches 1007e705c121SKalle Valo * before claiming or posting a request*/ 1008e705c121SKalle Valo list_add_tail(&rxb->list, &rxq->rx_used); 1009e705c121SKalle Valo 1010e705c121SKalle Valo if (unlikely(emergency)) 1011e705c121SKalle Valo return; 1012e705c121SKalle Valo 1013e705c121SKalle Valo /* Count the allocator owned RBDs */ 1014e705c121SKalle Valo rxq->used_count++; 1015e705c121SKalle Valo 1016e705c121SKalle Valo /* If we have RX_POST_REQ_ALLOC new released rx buffers - 1017e705c121SKalle Valo * issue a request for allocator. Modulo RX_CLAIM_REQ_ALLOC is 1018e705c121SKalle Valo * used for the case we failed to claim RX_CLAIM_REQ_ALLOC, 1019e705c121SKalle Valo * after but we still need to post another request. 1020e705c121SKalle Valo */ 1021e705c121SKalle Valo if ((rxq->used_count % RX_CLAIM_REQ_ALLOC) == RX_POST_REQ_ALLOC) { 1022e705c121SKalle Valo /* Move the 2 RBDs to the allocator ownership. 1023e705c121SKalle Valo Allocator has another 6 from pool for the request completion*/ 1024e705c121SKalle Valo spin_lock(&rba->lock); 1025e705c121SKalle Valo list_splice_tail_init(&rxq->rx_used, &rba->rbd_empty); 1026e705c121SKalle Valo spin_unlock(&rba->lock); 1027e705c121SKalle Valo 1028e705c121SKalle Valo atomic_inc(&rba->req_pending); 1029e705c121SKalle Valo queue_work(rba->alloc_wq, &rba->rx_alloc); 1030e705c121SKalle Valo } 1031e705c121SKalle Valo } 1032e705c121SKalle Valo 1033e705c121SKalle Valo static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans, 103478485054SSara Sharon struct iwl_rxq *rxq, 1035e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb, 1036e705c121SKalle Valo bool emergency) 1037e705c121SKalle Valo { 1038e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1039e705c121SKalle Valo struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; 1040e705c121SKalle Valo bool page_stolen = false; 1041e705c121SKalle Valo int max_len = PAGE_SIZE << trans_pcie->rx_page_order; 1042e705c121SKalle Valo u32 offset = 0; 1043e705c121SKalle Valo 1044e705c121SKalle Valo if (WARN_ON(!rxb)) 1045e705c121SKalle Valo return; 1046e705c121SKalle Valo 1047e705c121SKalle Valo dma_unmap_page(trans->dev, rxb->page_dma, max_len, DMA_FROM_DEVICE); 1048e705c121SKalle Valo 1049e705c121SKalle Valo while (offset + sizeof(u32) + sizeof(struct iwl_cmd_header) < max_len) { 1050e705c121SKalle Valo struct iwl_rx_packet *pkt; 1051e705c121SKalle Valo u16 sequence; 1052e705c121SKalle Valo bool reclaim; 1053e705c121SKalle Valo int index, cmd_index, len; 1054e705c121SKalle Valo struct iwl_rx_cmd_buffer rxcb = { 1055e705c121SKalle Valo ._offset = offset, 1056e705c121SKalle Valo ._rx_page_order = trans_pcie->rx_page_order, 1057e705c121SKalle Valo ._page = rxb->page, 1058e705c121SKalle Valo ._page_stolen = false, 1059e705c121SKalle Valo .truesize = max_len, 1060e705c121SKalle Valo }; 1061e705c121SKalle Valo 1062e705c121SKalle Valo pkt = rxb_addr(&rxcb); 1063e705c121SKalle Valo 1064e705c121SKalle Valo if (pkt->len_n_flags == cpu_to_le32(FH_RSCSR_FRAME_INVALID)) 1065e705c121SKalle Valo break; 1066e705c121SKalle Valo 1067e705c121SKalle Valo IWL_DEBUG_RX(trans, 1068e705c121SKalle Valo "cmd at offset %d: %s (0x%.2x, seq 0x%x)\n", 1069e705c121SKalle Valo rxcb._offset, 107039bdb17eSSharon Dvir iwl_get_cmd_string(trans, 107139bdb17eSSharon Dvir iwl_cmd_id(pkt->hdr.cmd, 107239bdb17eSSharon Dvir pkt->hdr.group_id, 107339bdb17eSSharon Dvir 0)), 1074e705c121SKalle Valo pkt->hdr.cmd, le16_to_cpu(pkt->hdr.sequence)); 1075e705c121SKalle Valo 1076e705c121SKalle Valo len = iwl_rx_packet_len(pkt); 1077e705c121SKalle Valo len += sizeof(u32); /* account for status word */ 1078e705c121SKalle Valo trace_iwlwifi_dev_rx(trans->dev, trans, pkt, len); 1079e705c121SKalle Valo trace_iwlwifi_dev_rx_data(trans->dev, trans, pkt, len); 1080e705c121SKalle Valo 1081e705c121SKalle Valo /* Reclaim a command buffer only if this packet is a response 1082e705c121SKalle Valo * to a (driver-originated) command. 1083e705c121SKalle Valo * If the packet (e.g. Rx frame) originated from uCode, 1084e705c121SKalle Valo * there is no command buffer to reclaim. 1085e705c121SKalle Valo * Ucode should set SEQ_RX_FRAME bit if ucode-originated, 1086e705c121SKalle Valo * but apparently a few don't get set; catch them here. */ 1087e705c121SKalle Valo reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME); 1088e705c121SKalle Valo if (reclaim) { 1089e705c121SKalle Valo int i; 1090e705c121SKalle Valo 1091e705c121SKalle Valo for (i = 0; i < trans_pcie->n_no_reclaim_cmds; i++) { 1092e705c121SKalle Valo if (trans_pcie->no_reclaim_cmds[i] == 1093e705c121SKalle Valo pkt->hdr.cmd) { 1094e705c121SKalle Valo reclaim = false; 1095e705c121SKalle Valo break; 1096e705c121SKalle Valo } 1097e705c121SKalle Valo } 1098e705c121SKalle Valo } 1099e705c121SKalle Valo 1100e705c121SKalle Valo sequence = le16_to_cpu(pkt->hdr.sequence); 1101e705c121SKalle Valo index = SEQ_TO_INDEX(sequence); 1102e705c121SKalle Valo cmd_index = get_cmd_index(&txq->q, index); 1103e705c121SKalle Valo 1104bce97731SSara Sharon if (rxq->id == 0) 1105bce97731SSara Sharon iwl_op_mode_rx(trans->op_mode, &rxq->napi, 1106bce97731SSara Sharon &rxcb); 1107bce97731SSara Sharon else 1108bce97731SSara Sharon iwl_op_mode_rx_rss(trans->op_mode, &rxq->napi, 1109bce97731SSara Sharon &rxcb, rxq->id); 1110e705c121SKalle Valo 1111e705c121SKalle Valo if (reclaim) { 1112e705c121SKalle Valo kzfree(txq->entries[cmd_index].free_buf); 1113e705c121SKalle Valo txq->entries[cmd_index].free_buf = NULL; 1114e705c121SKalle Valo } 1115e705c121SKalle Valo 1116e705c121SKalle Valo /* 1117e705c121SKalle Valo * After here, we should always check rxcb._page_stolen, 1118e705c121SKalle Valo * if it is true then one of the handlers took the page. 1119e705c121SKalle Valo */ 1120e705c121SKalle Valo 1121e705c121SKalle Valo if (reclaim) { 1122e705c121SKalle Valo /* Invoke any callbacks, transfer the buffer to caller, 1123e705c121SKalle Valo * and fire off the (possibly) blocking 1124e705c121SKalle Valo * iwl_trans_send_cmd() 1125e705c121SKalle Valo * as we reclaim the driver command queue */ 1126e705c121SKalle Valo if (!rxcb._page_stolen) 1127e705c121SKalle Valo iwl_pcie_hcmd_complete(trans, &rxcb); 1128e705c121SKalle Valo else 1129e705c121SKalle Valo IWL_WARN(trans, "Claim null rxb?\n"); 1130e705c121SKalle Valo } 1131e705c121SKalle Valo 1132e705c121SKalle Valo page_stolen |= rxcb._page_stolen; 1133e705c121SKalle Valo offset += ALIGN(len, FH_RSCSR_FRAME_ALIGN); 1134e705c121SKalle Valo } 1135e705c121SKalle Valo 1136e705c121SKalle Valo /* page was stolen from us -- free our reference */ 1137e705c121SKalle Valo if (page_stolen) { 1138e705c121SKalle Valo __free_pages(rxb->page, trans_pcie->rx_page_order); 1139e705c121SKalle Valo rxb->page = NULL; 1140e705c121SKalle Valo } 1141e705c121SKalle Valo 1142e705c121SKalle Valo /* Reuse the page if possible. For notification packets and 1143e705c121SKalle Valo * SKBs that fail to Rx correctly, add them back into the 1144e705c121SKalle Valo * rx_free list for reuse later. */ 1145e705c121SKalle Valo if (rxb->page != NULL) { 1146e705c121SKalle Valo rxb->page_dma = 1147e705c121SKalle Valo dma_map_page(trans->dev, rxb->page, 0, 1148e705c121SKalle Valo PAGE_SIZE << trans_pcie->rx_page_order, 1149e705c121SKalle Valo DMA_FROM_DEVICE); 1150e705c121SKalle Valo if (dma_mapping_error(trans->dev, rxb->page_dma)) { 1151e705c121SKalle Valo /* 1152e705c121SKalle Valo * free the page(s) as well to not break 1153e705c121SKalle Valo * the invariant that the items on the used 1154e705c121SKalle Valo * list have no page(s) 1155e705c121SKalle Valo */ 1156e705c121SKalle Valo __free_pages(rxb->page, trans_pcie->rx_page_order); 1157e705c121SKalle Valo rxb->page = NULL; 1158e705c121SKalle Valo iwl_pcie_rx_reuse_rbd(trans, rxb, rxq, emergency); 1159e705c121SKalle Valo } else { 1160e705c121SKalle Valo list_add_tail(&rxb->list, &rxq->rx_free); 1161e705c121SKalle Valo rxq->free_count++; 1162e705c121SKalle Valo } 1163e705c121SKalle Valo } else 1164e705c121SKalle Valo iwl_pcie_rx_reuse_rbd(trans, rxb, rxq, emergency); 1165e705c121SKalle Valo } 1166e705c121SKalle Valo 1167e705c121SKalle Valo /* 1168e705c121SKalle Valo * iwl_pcie_rx_handle - Main entry function for receiving responses from fw 1169e705c121SKalle Valo */ 11702e5d4a8fSHaim Dreyfuss static void iwl_pcie_rx_handle(struct iwl_trans *trans, int queue) 1171e705c121SKalle Valo { 1172e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 11732e5d4a8fSHaim Dreyfuss struct iwl_rxq *rxq = &trans_pcie->rxq[queue]; 1174d56daea4SSara Sharon u32 r, i, count = 0; 1175e705c121SKalle Valo bool emergency = false; 1176e705c121SKalle Valo 1177e705c121SKalle Valo restart: 1178e705c121SKalle Valo spin_lock(&rxq->lock); 1179e705c121SKalle Valo /* uCode's read index (stored in shared DRAM) indicates the last Rx 1180e705c121SKalle Valo * buffer that the driver may process (last buffer filled by ucode). */ 1181e705c121SKalle Valo r = le16_to_cpu(ACCESS_ONCE(rxq->rb_stts->closed_rb_num)) & 0x0FFF; 1182e705c121SKalle Valo i = rxq->read; 1183e705c121SKalle Valo 11845eae443eSSara Sharon /* W/A 9000 device step A0 wrap-around bug */ 11855eae443eSSara Sharon r &= (rxq->queue_size - 1); 11865eae443eSSara Sharon 1187e705c121SKalle Valo /* Rx interrupt, but nothing sent from uCode */ 1188e705c121SKalle Valo if (i == r) 11895eae443eSSara Sharon IWL_DEBUG_RX(trans, "Q %d: HW = SW = %d\n", rxq->id, r); 1190e705c121SKalle Valo 1191e705c121SKalle Valo while (i != r) { 1192e705c121SKalle Valo struct iwl_rx_mem_buffer *rxb; 1193e705c121SKalle Valo 119496a6497bSSara Sharon if (unlikely(rxq->used_count == rxq->queue_size / 2)) 1195e705c121SKalle Valo emergency = true; 1196e705c121SKalle Valo 119796a6497bSSara Sharon if (trans->cfg->mq_rx_supported) { 119896a6497bSSara Sharon /* 119996a6497bSSara Sharon * used_bd is a 32 bit but only 12 are used to retrieve 120096a6497bSSara Sharon * the vid 120196a6497bSSara Sharon */ 12025eae443eSSara Sharon u16 vid = le32_to_cpu(rxq->used_bd[i]) & 0x0FFF; 120396a6497bSSara Sharon 12045eae443eSSara Sharon if (WARN(vid >= ARRAY_SIZE(trans_pcie->global_table), 12055eae443eSSara Sharon "Invalid rxb index from HW %u\n", (u32)vid)) 12065eae443eSSara Sharon goto out; 120796a6497bSSara Sharon rxb = trans_pcie->global_table[vid]; 120896a6497bSSara Sharon } else { 1209e705c121SKalle Valo rxb = rxq->queue[i]; 1210e705c121SKalle Valo rxq->queue[i] = NULL; 121196a6497bSSara Sharon } 1212e705c121SKalle Valo 12135eae443eSSara Sharon IWL_DEBUG_RX(trans, "Q %d: HW = %d, SW = %d\n", rxq->id, r, i); 121478485054SSara Sharon iwl_pcie_rx_handle_rb(trans, rxq, rxb, emergency); 1215e705c121SKalle Valo 121696a6497bSSara Sharon i = (i + 1) & (rxq->queue_size - 1); 1217e705c121SKalle Valo 1218d56daea4SSara Sharon /* 1219d56daea4SSara Sharon * If we have RX_CLAIM_REQ_ALLOC released rx buffers - 1220d56daea4SSara Sharon * try to claim the pre-allocated buffers from the allocator. 1221d56daea4SSara Sharon * If not ready - will try to reclaim next time. 1222d56daea4SSara Sharon * There is no need to reschedule work - allocator exits only 1223d56daea4SSara Sharon * on success 1224e705c121SKalle Valo */ 1225d56daea4SSara Sharon if (rxq->used_count >= RX_CLAIM_REQ_ALLOC) 1226d56daea4SSara Sharon iwl_pcie_rx_allocator_get(trans, rxq); 1227e705c121SKalle Valo 1228d56daea4SSara Sharon if (rxq->used_count % RX_CLAIM_REQ_ALLOC == 0 && !emergency) { 1229d56daea4SSara Sharon struct iwl_rb_allocator *rba = &trans_pcie->rba; 1230d56daea4SSara Sharon 1231d56daea4SSara Sharon /* Add the remaining empty RBDs for allocator use */ 1232d56daea4SSara Sharon spin_lock(&rba->lock); 1233d56daea4SSara Sharon list_splice_tail_init(&rxq->rx_used, &rba->rbd_empty); 1234d56daea4SSara Sharon spin_unlock(&rba->lock); 1235d56daea4SSara Sharon } else if (emergency) { 1236e705c121SKalle Valo count++; 1237e705c121SKalle Valo if (count == 8) { 1238e705c121SKalle Valo count = 0; 123996a6497bSSara Sharon if (rxq->used_count < rxq->queue_size / 3) 1240e705c121SKalle Valo emergency = false; 1241e0e168dcSGregory Greenman 1242e705c121SKalle Valo rxq->read = i; 1243e705c121SKalle Valo spin_unlock(&rxq->lock); 1244e0e168dcSGregory Greenman iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC, rxq); 124578485054SSara Sharon iwl_pcie_rxq_restock(trans, rxq); 1246e705c121SKalle Valo goto restart; 1247e705c121SKalle Valo } 1248e705c121SKalle Valo } 1249e0e168dcSGregory Greenman } 12505eae443eSSara Sharon out: 1251e705c121SKalle Valo /* Backtrack one entry */ 1252e705c121SKalle Valo rxq->read = i; 1253e705c121SKalle Valo spin_unlock(&rxq->lock); 1254e705c121SKalle Valo 1255e705c121SKalle Valo /* 1256e705c121SKalle Valo * handle a case where in emergency there are some unallocated RBDs. 1257e705c121SKalle Valo * those RBDs are in the used list, but are not tracked by the queue's 1258e705c121SKalle Valo * used_count which counts allocator owned RBDs. 1259e705c121SKalle Valo * unallocated emergency RBDs must be allocated on exit, otherwise 1260e705c121SKalle Valo * when called again the function may not be in emergency mode and 1261e705c121SKalle Valo * they will be handed to the allocator with no tracking in the RBD 1262e705c121SKalle Valo * allocator counters, which will lead to them never being claimed back 1263e705c121SKalle Valo * by the queue. 1264e705c121SKalle Valo * by allocating them here, they are now in the queue free list, and 1265e705c121SKalle Valo * will be restocked by the next call of iwl_pcie_rxq_restock. 1266e705c121SKalle Valo */ 1267e705c121SKalle Valo if (unlikely(emergency && count)) 126878485054SSara Sharon iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC, rxq); 1269e705c121SKalle Valo 1270bce97731SSara Sharon if (rxq->napi.poll) 1271bce97731SSara Sharon napi_gro_flush(&rxq->napi, false); 1272e0e168dcSGregory Greenman 1273e0e168dcSGregory Greenman iwl_pcie_rxq_restock(trans, rxq); 1274e705c121SKalle Valo } 1275e705c121SKalle Valo 12762e5d4a8fSHaim Dreyfuss static struct iwl_trans_pcie *iwl_pcie_get_trans_pcie(struct msix_entry *entry) 12772e5d4a8fSHaim Dreyfuss { 12782e5d4a8fSHaim Dreyfuss u8 queue = entry->entry; 12792e5d4a8fSHaim Dreyfuss struct msix_entry *entries = entry - queue; 12802e5d4a8fSHaim Dreyfuss 12812e5d4a8fSHaim Dreyfuss return container_of(entries, struct iwl_trans_pcie, msix_entries[0]); 12822e5d4a8fSHaim Dreyfuss } 12832e5d4a8fSHaim Dreyfuss 12842e5d4a8fSHaim Dreyfuss static inline void iwl_pcie_clear_irq(struct iwl_trans *trans, 12852e5d4a8fSHaim Dreyfuss struct msix_entry *entry) 12862e5d4a8fSHaim Dreyfuss { 12872e5d4a8fSHaim Dreyfuss /* 12882e5d4a8fSHaim Dreyfuss * Before sending the interrupt the HW disables it to prevent 12892e5d4a8fSHaim Dreyfuss * a nested interrupt. This is done by writing 1 to the corresponding 12902e5d4a8fSHaim Dreyfuss * bit in the mask register. After handling the interrupt, it should be 12912e5d4a8fSHaim Dreyfuss * re-enabled by clearing this bit. This register is defined as 12922e5d4a8fSHaim Dreyfuss * write 1 clear (W1C) register, meaning that it's being clear 12932e5d4a8fSHaim Dreyfuss * by writing 1 to the bit. 12942e5d4a8fSHaim Dreyfuss */ 12952e5d4a8fSHaim Dreyfuss iwl_write_direct32(trans, CSR_MSIX_AUTOMASK_ST_AD, BIT(entry->entry)); 12962e5d4a8fSHaim Dreyfuss } 12972e5d4a8fSHaim Dreyfuss 12982e5d4a8fSHaim Dreyfuss /* 12992e5d4a8fSHaim Dreyfuss * iwl_pcie_rx_msix_handle - Main entry function for receiving responses from fw 13002e5d4a8fSHaim Dreyfuss * This interrupt handler should be used with RSS queue only. 13012e5d4a8fSHaim Dreyfuss */ 13022e5d4a8fSHaim Dreyfuss irqreturn_t iwl_pcie_irq_rx_msix_handler(int irq, void *dev_id) 13032e5d4a8fSHaim Dreyfuss { 13042e5d4a8fSHaim Dreyfuss struct msix_entry *entry = dev_id; 13052e5d4a8fSHaim Dreyfuss struct iwl_trans_pcie *trans_pcie = iwl_pcie_get_trans_pcie(entry); 13062e5d4a8fSHaim Dreyfuss struct iwl_trans *trans = trans_pcie->trans; 13072e5d4a8fSHaim Dreyfuss 13085eae443eSSara Sharon if (WARN_ON(entry->entry >= trans->num_rx_queues)) 13095eae443eSSara Sharon return IRQ_NONE; 13105eae443eSSara Sharon 13112e5d4a8fSHaim Dreyfuss lock_map_acquire(&trans->sync_cmd_lockdep_map); 13122e5d4a8fSHaim Dreyfuss 13132e5d4a8fSHaim Dreyfuss local_bh_disable(); 13142e5d4a8fSHaim Dreyfuss iwl_pcie_rx_handle(trans, entry->entry); 13152e5d4a8fSHaim Dreyfuss local_bh_enable(); 13162e5d4a8fSHaim Dreyfuss 13172e5d4a8fSHaim Dreyfuss iwl_pcie_clear_irq(trans, entry); 13182e5d4a8fSHaim Dreyfuss 13192e5d4a8fSHaim Dreyfuss lock_map_release(&trans->sync_cmd_lockdep_map); 13202e5d4a8fSHaim Dreyfuss 13212e5d4a8fSHaim Dreyfuss return IRQ_HANDLED; 13222e5d4a8fSHaim Dreyfuss } 13232e5d4a8fSHaim Dreyfuss 1324e705c121SKalle Valo /* 1325e705c121SKalle Valo * iwl_pcie_irq_handle_error - called for HW or SW error interrupt from card 1326e705c121SKalle Valo */ 1327e705c121SKalle Valo static void iwl_pcie_irq_handle_error(struct iwl_trans *trans) 1328e705c121SKalle Valo { 1329e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1330e705c121SKalle Valo int i; 1331e705c121SKalle Valo 1332e705c121SKalle Valo /* W/A for WiFi/WiMAX coex and WiMAX own the RF */ 1333e705c121SKalle Valo if (trans->cfg->internal_wimax_coex && 1334e705c121SKalle Valo !trans->cfg->apmg_not_supported && 1335e705c121SKalle Valo (!(iwl_read_prph(trans, APMG_CLK_CTRL_REG) & 1336e705c121SKalle Valo APMS_CLK_VAL_MRB_FUNC_MODE) || 1337e705c121SKalle Valo (iwl_read_prph(trans, APMG_PS_CTRL_REG) & 1338e705c121SKalle Valo APMG_PS_CTRL_VAL_RESET_REQ))) { 1339e705c121SKalle Valo clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 1340e705c121SKalle Valo iwl_op_mode_wimax_active(trans->op_mode); 1341e705c121SKalle Valo wake_up(&trans_pcie->wait_command_queue); 1342e705c121SKalle Valo return; 1343e705c121SKalle Valo } 1344e705c121SKalle Valo 1345e705c121SKalle Valo iwl_pcie_dump_csr(trans); 1346e705c121SKalle Valo iwl_dump_fh(trans, NULL); 1347e705c121SKalle Valo 1348e705c121SKalle Valo local_bh_disable(); 1349e705c121SKalle Valo /* The STATUS_FW_ERROR bit is set in this function. This must happen 1350e705c121SKalle Valo * before we wake up the command caller, to ensure a proper cleanup. */ 1351e705c121SKalle Valo iwl_trans_fw_error(trans); 1352e705c121SKalle Valo local_bh_enable(); 1353e705c121SKalle Valo 1354e705c121SKalle Valo for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) 1355e705c121SKalle Valo del_timer(&trans_pcie->txq[i].stuck_timer); 1356e705c121SKalle Valo 1357e705c121SKalle Valo clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); 1358e705c121SKalle Valo wake_up(&trans_pcie->wait_command_queue); 1359e705c121SKalle Valo } 1360e705c121SKalle Valo 1361e705c121SKalle Valo static u32 iwl_pcie_int_cause_non_ict(struct iwl_trans *trans) 1362e705c121SKalle Valo { 1363e705c121SKalle Valo u32 inta; 1364e705c121SKalle Valo 1365e705c121SKalle Valo lockdep_assert_held(&IWL_TRANS_GET_PCIE_TRANS(trans)->irq_lock); 1366e705c121SKalle Valo 1367e705c121SKalle Valo trace_iwlwifi_dev_irq(trans->dev); 1368e705c121SKalle Valo 1369e705c121SKalle Valo /* Discover which interrupts are active/pending */ 1370e705c121SKalle Valo inta = iwl_read32(trans, CSR_INT); 1371e705c121SKalle Valo 1372e705c121SKalle Valo /* the thread will service interrupts and re-enable them */ 1373e705c121SKalle Valo return inta; 1374e705c121SKalle Valo } 1375e705c121SKalle Valo 1376e705c121SKalle Valo /* a device (PCI-E) page is 4096 bytes long */ 1377e705c121SKalle Valo #define ICT_SHIFT 12 1378e705c121SKalle Valo #define ICT_SIZE (1 << ICT_SHIFT) 1379e705c121SKalle Valo #define ICT_COUNT (ICT_SIZE / sizeof(u32)) 1380e705c121SKalle Valo 1381e705c121SKalle Valo /* interrupt handler using ict table, with this interrupt driver will 1382e705c121SKalle Valo * stop using INTA register to get device's interrupt, reading this register 1383e705c121SKalle Valo * is expensive, device will write interrupts in ICT dram table, increment 1384e705c121SKalle Valo * index then will fire interrupt to driver, driver will OR all ICT table 1385e705c121SKalle Valo * entries from current index up to table entry with 0 value. the result is 1386e705c121SKalle Valo * the interrupt we need to service, driver will set the entries back to 0 and 1387e705c121SKalle Valo * set index. 1388e705c121SKalle Valo */ 1389e705c121SKalle Valo static u32 iwl_pcie_int_cause_ict(struct iwl_trans *trans) 1390e705c121SKalle Valo { 1391e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1392e705c121SKalle Valo u32 inta; 1393e705c121SKalle Valo u32 val = 0; 1394e705c121SKalle Valo u32 read; 1395e705c121SKalle Valo 1396e705c121SKalle Valo trace_iwlwifi_dev_irq(trans->dev); 1397e705c121SKalle Valo 1398e705c121SKalle Valo /* Ignore interrupt if there's nothing in NIC to service. 1399e705c121SKalle Valo * This may be due to IRQ shared with another device, 1400e705c121SKalle Valo * or due to sporadic interrupts thrown from our NIC. */ 1401e705c121SKalle Valo read = le32_to_cpu(trans_pcie->ict_tbl[trans_pcie->ict_index]); 1402e705c121SKalle Valo trace_iwlwifi_dev_ict_read(trans->dev, trans_pcie->ict_index, read); 1403e705c121SKalle Valo if (!read) 1404e705c121SKalle Valo return 0; 1405e705c121SKalle Valo 1406e705c121SKalle Valo /* 1407e705c121SKalle Valo * Collect all entries up to the first 0, starting from ict_index; 1408e705c121SKalle Valo * note we already read at ict_index. 1409e705c121SKalle Valo */ 1410e705c121SKalle Valo do { 1411e705c121SKalle Valo val |= read; 1412e705c121SKalle Valo IWL_DEBUG_ISR(trans, "ICT index %d value 0x%08X\n", 1413e705c121SKalle Valo trans_pcie->ict_index, read); 1414e705c121SKalle Valo trans_pcie->ict_tbl[trans_pcie->ict_index] = 0; 1415e705c121SKalle Valo trans_pcie->ict_index = 1416e705c121SKalle Valo ((trans_pcie->ict_index + 1) & (ICT_COUNT - 1)); 1417e705c121SKalle Valo 1418e705c121SKalle Valo read = le32_to_cpu(trans_pcie->ict_tbl[trans_pcie->ict_index]); 1419e705c121SKalle Valo trace_iwlwifi_dev_ict_read(trans->dev, trans_pcie->ict_index, 1420e705c121SKalle Valo read); 1421e705c121SKalle Valo } while (read); 1422e705c121SKalle Valo 1423e705c121SKalle Valo /* We should not get this value, just ignore it. */ 1424e705c121SKalle Valo if (val == 0xffffffff) 1425e705c121SKalle Valo val = 0; 1426e705c121SKalle Valo 1427e705c121SKalle Valo /* 1428e705c121SKalle Valo * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit 1429e705c121SKalle Valo * (bit 15 before shifting it to 31) to clear when using interrupt 1430e705c121SKalle Valo * coalescing. fortunately, bits 18 and 19 stay set when this happens 1431e705c121SKalle Valo * so we use them to decide on the real state of the Rx bit. 1432e705c121SKalle Valo * In order words, bit 15 is set if bit 18 or bit 19 are set. 1433e705c121SKalle Valo */ 1434e705c121SKalle Valo if (val & 0xC0000) 1435e705c121SKalle Valo val |= 0x8000; 1436e705c121SKalle Valo 1437e705c121SKalle Valo inta = (0xff & val) | ((0xff00 & val) << 16); 1438e705c121SKalle Valo return inta; 1439e705c121SKalle Valo } 1440e705c121SKalle Valo 1441e705c121SKalle Valo irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id) 1442e705c121SKalle Valo { 1443e705c121SKalle Valo struct iwl_trans *trans = dev_id; 1444e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1445e705c121SKalle Valo struct isr_statistics *isr_stats = &trans_pcie->isr_stats; 1446e705c121SKalle Valo u32 inta = 0; 1447e705c121SKalle Valo u32 handled = 0; 1448e705c121SKalle Valo 1449e705c121SKalle Valo lock_map_acquire(&trans->sync_cmd_lockdep_map); 1450e705c121SKalle Valo 1451e705c121SKalle Valo spin_lock(&trans_pcie->irq_lock); 1452e705c121SKalle Valo 1453e705c121SKalle Valo /* dram interrupt table not set yet, 1454e705c121SKalle Valo * use legacy interrupt. 1455e705c121SKalle Valo */ 1456e705c121SKalle Valo if (likely(trans_pcie->use_ict)) 1457e705c121SKalle Valo inta = iwl_pcie_int_cause_ict(trans); 1458e705c121SKalle Valo else 1459e705c121SKalle Valo inta = iwl_pcie_int_cause_non_ict(trans); 1460e705c121SKalle Valo 1461e705c121SKalle Valo if (iwl_have_debug_level(IWL_DL_ISR)) { 1462e705c121SKalle Valo IWL_DEBUG_ISR(trans, 1463e705c121SKalle Valo "ISR inta 0x%08x, enabled 0x%08x(sw), enabled(hw) 0x%08x, fh 0x%08x\n", 1464e705c121SKalle Valo inta, trans_pcie->inta_mask, 1465e705c121SKalle Valo iwl_read32(trans, CSR_INT_MASK), 1466e705c121SKalle Valo iwl_read32(trans, CSR_FH_INT_STATUS)); 1467e705c121SKalle Valo if (inta & (~trans_pcie->inta_mask)) 1468e705c121SKalle Valo IWL_DEBUG_ISR(trans, 1469e705c121SKalle Valo "We got a masked interrupt (0x%08x)\n", 1470e705c121SKalle Valo inta & (~trans_pcie->inta_mask)); 1471e705c121SKalle Valo } 1472e705c121SKalle Valo 1473e705c121SKalle Valo inta &= trans_pcie->inta_mask; 1474e705c121SKalle Valo 1475e705c121SKalle Valo /* 1476e705c121SKalle Valo * Ignore interrupt if there's nothing in NIC to service. 1477e705c121SKalle Valo * This may be due to IRQ shared with another device, 1478e705c121SKalle Valo * or due to sporadic interrupts thrown from our NIC. 1479e705c121SKalle Valo */ 1480e705c121SKalle Valo if (unlikely(!inta)) { 1481e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Ignore interrupt, inta == 0\n"); 1482e705c121SKalle Valo /* 1483e705c121SKalle Valo * Re-enable interrupts here since we don't 1484e705c121SKalle Valo * have anything to service 1485e705c121SKalle Valo */ 1486e705c121SKalle Valo if (test_bit(STATUS_INT_ENABLED, &trans->status)) 1487e705c121SKalle Valo iwl_enable_interrupts(trans); 1488e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1489e705c121SKalle Valo lock_map_release(&trans->sync_cmd_lockdep_map); 1490e705c121SKalle Valo return IRQ_NONE; 1491e705c121SKalle Valo } 1492e705c121SKalle Valo 1493e705c121SKalle Valo if (unlikely(inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0)) { 1494e705c121SKalle Valo /* 1495e705c121SKalle Valo * Hardware disappeared. It might have 1496e705c121SKalle Valo * already raised an interrupt. 1497e705c121SKalle Valo */ 1498e705c121SKalle Valo IWL_WARN(trans, "HARDWARE GONE?? INTA == 0x%08x\n", inta); 1499e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1500e705c121SKalle Valo goto out; 1501e705c121SKalle Valo } 1502e705c121SKalle Valo 1503e705c121SKalle Valo /* Ack/clear/reset pending uCode interrupts. 1504e705c121SKalle Valo * Note: Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS, 1505e705c121SKalle Valo */ 1506e705c121SKalle Valo /* There is a hardware bug in the interrupt mask function that some 1507e705c121SKalle Valo * interrupts (i.e. CSR_INT_BIT_SCD) can still be generated even if 1508e705c121SKalle Valo * they are disabled in the CSR_INT_MASK register. Furthermore the 1509e705c121SKalle Valo * ICT interrupt handling mechanism has another bug that might cause 1510e705c121SKalle Valo * these unmasked interrupts fail to be detected. We workaround the 1511e705c121SKalle Valo * hardware bugs here by ACKing all the possible interrupts so that 1512e705c121SKalle Valo * interrupt coalescing can still be achieved. 1513e705c121SKalle Valo */ 1514e705c121SKalle Valo iwl_write32(trans, CSR_INT, inta | ~trans_pcie->inta_mask); 1515e705c121SKalle Valo 1516e705c121SKalle Valo if (iwl_have_debug_level(IWL_DL_ISR)) 1517e705c121SKalle Valo IWL_DEBUG_ISR(trans, "inta 0x%08x, enabled 0x%08x\n", 1518e705c121SKalle Valo inta, iwl_read32(trans, CSR_INT_MASK)); 1519e705c121SKalle Valo 1520e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1521e705c121SKalle Valo 1522e705c121SKalle Valo /* Now service all interrupt bits discovered above. */ 1523e705c121SKalle Valo if (inta & CSR_INT_BIT_HW_ERR) { 1524e705c121SKalle Valo IWL_ERR(trans, "Hardware error detected. Restarting.\n"); 1525e705c121SKalle Valo 1526e705c121SKalle Valo /* Tell the device to stop sending interrupts */ 1527e705c121SKalle Valo iwl_disable_interrupts(trans); 1528e705c121SKalle Valo 1529e705c121SKalle Valo isr_stats->hw++; 1530e705c121SKalle Valo iwl_pcie_irq_handle_error(trans); 1531e705c121SKalle Valo 1532e705c121SKalle Valo handled |= CSR_INT_BIT_HW_ERR; 1533e705c121SKalle Valo 1534e705c121SKalle Valo goto out; 1535e705c121SKalle Valo } 1536e705c121SKalle Valo 1537e705c121SKalle Valo if (iwl_have_debug_level(IWL_DL_ISR)) { 1538e705c121SKalle Valo /* NIC fires this, but we don't use it, redundant with WAKEUP */ 1539e705c121SKalle Valo if (inta & CSR_INT_BIT_SCD) { 1540e705c121SKalle Valo IWL_DEBUG_ISR(trans, 1541e705c121SKalle Valo "Scheduler finished to transmit the frame/frames.\n"); 1542e705c121SKalle Valo isr_stats->sch++; 1543e705c121SKalle Valo } 1544e705c121SKalle Valo 1545e705c121SKalle Valo /* Alive notification via Rx interrupt will do the real work */ 1546e705c121SKalle Valo if (inta & CSR_INT_BIT_ALIVE) { 1547e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Alive interrupt\n"); 1548e705c121SKalle Valo isr_stats->alive++; 1549e705c121SKalle Valo } 1550e705c121SKalle Valo } 1551e705c121SKalle Valo 1552e705c121SKalle Valo /* Safely ignore these bits for debug checks below */ 1553e705c121SKalle Valo inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE); 1554e705c121SKalle Valo 1555e705c121SKalle Valo /* HW RF KILL switch toggled */ 1556e705c121SKalle Valo if (inta & CSR_INT_BIT_RF_KILL) { 1557e705c121SKalle Valo bool hw_rfkill; 1558e705c121SKalle Valo 1559e705c121SKalle Valo hw_rfkill = iwl_is_rfkill_set(trans); 1560e705c121SKalle Valo IWL_WARN(trans, "RF_KILL bit toggled to %s.\n", 1561e705c121SKalle Valo hw_rfkill ? "disable radio" : "enable radio"); 1562e705c121SKalle Valo 1563e705c121SKalle Valo isr_stats->rfkill++; 1564e705c121SKalle Valo 1565e705c121SKalle Valo mutex_lock(&trans_pcie->mutex); 1566e705c121SKalle Valo iwl_trans_pcie_rf_kill(trans, hw_rfkill); 1567e705c121SKalle Valo mutex_unlock(&trans_pcie->mutex); 1568e705c121SKalle Valo if (hw_rfkill) { 1569e705c121SKalle Valo set_bit(STATUS_RFKILL, &trans->status); 1570e705c121SKalle Valo if (test_and_clear_bit(STATUS_SYNC_HCMD_ACTIVE, 1571e705c121SKalle Valo &trans->status)) 1572e705c121SKalle Valo IWL_DEBUG_RF_KILL(trans, 1573e705c121SKalle Valo "Rfkill while SYNC HCMD in flight\n"); 1574e705c121SKalle Valo wake_up(&trans_pcie->wait_command_queue); 1575e705c121SKalle Valo } else { 1576e705c121SKalle Valo clear_bit(STATUS_RFKILL, &trans->status); 1577e705c121SKalle Valo } 1578e705c121SKalle Valo 1579e705c121SKalle Valo handled |= CSR_INT_BIT_RF_KILL; 1580e705c121SKalle Valo } 1581e705c121SKalle Valo 1582e705c121SKalle Valo /* Chip got too hot and stopped itself */ 1583e705c121SKalle Valo if (inta & CSR_INT_BIT_CT_KILL) { 1584e705c121SKalle Valo IWL_ERR(trans, "Microcode CT kill error detected.\n"); 1585e705c121SKalle Valo isr_stats->ctkill++; 1586e705c121SKalle Valo handled |= CSR_INT_BIT_CT_KILL; 1587e705c121SKalle Valo } 1588e705c121SKalle Valo 1589e705c121SKalle Valo /* Error detected by uCode */ 1590e705c121SKalle Valo if (inta & CSR_INT_BIT_SW_ERR) { 1591e705c121SKalle Valo IWL_ERR(trans, "Microcode SW error detected. " 1592e705c121SKalle Valo " Restarting 0x%X.\n", inta); 1593e705c121SKalle Valo isr_stats->sw++; 1594e705c121SKalle Valo iwl_pcie_irq_handle_error(trans); 1595e705c121SKalle Valo handled |= CSR_INT_BIT_SW_ERR; 1596e705c121SKalle Valo } 1597e705c121SKalle Valo 1598e705c121SKalle Valo /* uCode wakes up after power-down sleep */ 1599e705c121SKalle Valo if (inta & CSR_INT_BIT_WAKEUP) { 1600e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Wakeup interrupt\n"); 1601e705c121SKalle Valo iwl_pcie_rxq_check_wrptr(trans); 1602e705c121SKalle Valo iwl_pcie_txq_check_wrptrs(trans); 1603e705c121SKalle Valo 1604e705c121SKalle Valo isr_stats->wakeup++; 1605e705c121SKalle Valo 1606e705c121SKalle Valo handled |= CSR_INT_BIT_WAKEUP; 1607e705c121SKalle Valo } 1608e705c121SKalle Valo 1609e705c121SKalle Valo /* All uCode command responses, including Tx command responses, 1610e705c121SKalle Valo * Rx "responses" (frame-received notification), and other 1611e705c121SKalle Valo * notifications from uCode come through here*/ 1612e705c121SKalle Valo if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX | 1613e705c121SKalle Valo CSR_INT_BIT_RX_PERIODIC)) { 1614e705c121SKalle Valo IWL_DEBUG_ISR(trans, "Rx interrupt\n"); 1615e705c121SKalle Valo if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) { 1616e705c121SKalle Valo handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX); 1617e705c121SKalle Valo iwl_write32(trans, CSR_FH_INT_STATUS, 1618e705c121SKalle Valo CSR_FH_INT_RX_MASK); 1619e705c121SKalle Valo } 1620e705c121SKalle Valo if (inta & CSR_INT_BIT_RX_PERIODIC) { 1621e705c121SKalle Valo handled |= CSR_INT_BIT_RX_PERIODIC; 1622e705c121SKalle Valo iwl_write32(trans, 1623e705c121SKalle Valo CSR_INT, CSR_INT_BIT_RX_PERIODIC); 1624e705c121SKalle Valo } 1625e705c121SKalle Valo /* Sending RX interrupt require many steps to be done in the 1626e705c121SKalle Valo * the device: 1627e705c121SKalle Valo * 1- write interrupt to current index in ICT table. 1628e705c121SKalle Valo * 2- dma RX frame. 1629e705c121SKalle Valo * 3- update RX shared data to indicate last write index. 1630e705c121SKalle Valo * 4- send interrupt. 1631e705c121SKalle Valo * This could lead to RX race, driver could receive RX interrupt 1632e705c121SKalle Valo * but the shared data changes does not reflect this; 1633e705c121SKalle Valo * periodic interrupt will detect any dangling Rx activity. 1634e705c121SKalle Valo */ 1635e705c121SKalle Valo 1636e705c121SKalle Valo /* Disable periodic interrupt; we use it as just a one-shot. */ 1637e705c121SKalle Valo iwl_write8(trans, CSR_INT_PERIODIC_REG, 1638e705c121SKalle Valo CSR_INT_PERIODIC_DIS); 1639e705c121SKalle Valo 1640e705c121SKalle Valo /* 1641e705c121SKalle Valo * Enable periodic interrupt in 8 msec only if we received 1642e705c121SKalle Valo * real RX interrupt (instead of just periodic int), to catch 1643e705c121SKalle Valo * any dangling Rx interrupt. If it was just the periodic 1644e705c121SKalle Valo * interrupt, there was no dangling Rx activity, and no need 1645e705c121SKalle Valo * to extend the periodic interrupt; one-shot is enough. 1646e705c121SKalle Valo */ 1647e705c121SKalle Valo if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) 1648e705c121SKalle Valo iwl_write8(trans, CSR_INT_PERIODIC_REG, 1649e705c121SKalle Valo CSR_INT_PERIODIC_ENA); 1650e705c121SKalle Valo 1651e705c121SKalle Valo isr_stats->rx++; 1652e705c121SKalle Valo 1653e705c121SKalle Valo local_bh_disable(); 16542e5d4a8fSHaim Dreyfuss iwl_pcie_rx_handle(trans, 0); 1655e705c121SKalle Valo local_bh_enable(); 1656e705c121SKalle Valo } 1657e705c121SKalle Valo 1658e705c121SKalle Valo /* This "Tx" DMA channel is used only for loading uCode */ 1659e705c121SKalle Valo if (inta & CSR_INT_BIT_FH_TX) { 1660e705c121SKalle Valo iwl_write32(trans, CSR_FH_INT_STATUS, CSR_FH_INT_TX_MASK); 1661e705c121SKalle Valo IWL_DEBUG_ISR(trans, "uCode load interrupt\n"); 1662e705c121SKalle Valo isr_stats->tx++; 1663e705c121SKalle Valo handled |= CSR_INT_BIT_FH_TX; 1664e705c121SKalle Valo /* Wake up uCode load routine, now that load is complete */ 1665e705c121SKalle Valo trans_pcie->ucode_write_complete = true; 1666e705c121SKalle Valo wake_up(&trans_pcie->ucode_write_waitq); 1667e705c121SKalle Valo } 1668e705c121SKalle Valo 1669e705c121SKalle Valo if (inta & ~handled) { 1670e705c121SKalle Valo IWL_ERR(trans, "Unhandled INTA bits 0x%08x\n", inta & ~handled); 1671e705c121SKalle Valo isr_stats->unhandled++; 1672e705c121SKalle Valo } 1673e705c121SKalle Valo 1674e705c121SKalle Valo if (inta & ~(trans_pcie->inta_mask)) { 1675e705c121SKalle Valo IWL_WARN(trans, "Disabled INTA bits 0x%08x were pending\n", 1676e705c121SKalle Valo inta & ~trans_pcie->inta_mask); 1677e705c121SKalle Valo } 1678e705c121SKalle Valo 1679a6bd005fSEmmanuel Grumbach /* we are loading the firmware, enable FH_TX interrupt only */ 1680a6bd005fSEmmanuel Grumbach if (handled & CSR_INT_BIT_FH_TX) 1681a6bd005fSEmmanuel Grumbach iwl_enable_fw_load_int(trans); 1682a6bd005fSEmmanuel Grumbach /* only Re-enable all interrupt if disabled by irq */ 1683a6bd005fSEmmanuel Grumbach else if (test_bit(STATUS_INT_ENABLED, &trans->status)) 1684e705c121SKalle Valo iwl_enable_interrupts(trans); 1685e705c121SKalle Valo /* Re-enable RF_KILL if it occurred */ 1686e705c121SKalle Valo else if (handled & CSR_INT_BIT_RF_KILL) 1687e705c121SKalle Valo iwl_enable_rfkill_int(trans); 1688e705c121SKalle Valo 1689e705c121SKalle Valo out: 1690e705c121SKalle Valo lock_map_release(&trans->sync_cmd_lockdep_map); 1691e705c121SKalle Valo return IRQ_HANDLED; 1692e705c121SKalle Valo } 1693e705c121SKalle Valo 1694e705c121SKalle Valo /****************************************************************************** 1695e705c121SKalle Valo * 1696e705c121SKalle Valo * ICT functions 1697e705c121SKalle Valo * 1698e705c121SKalle Valo ******************************************************************************/ 1699e705c121SKalle Valo 1700e705c121SKalle Valo /* Free dram table */ 1701e705c121SKalle Valo void iwl_pcie_free_ict(struct iwl_trans *trans) 1702e705c121SKalle Valo { 1703e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1704e705c121SKalle Valo 1705e705c121SKalle Valo if (trans_pcie->ict_tbl) { 1706e705c121SKalle Valo dma_free_coherent(trans->dev, ICT_SIZE, 1707e705c121SKalle Valo trans_pcie->ict_tbl, 1708e705c121SKalle Valo trans_pcie->ict_tbl_dma); 1709e705c121SKalle Valo trans_pcie->ict_tbl = NULL; 1710e705c121SKalle Valo trans_pcie->ict_tbl_dma = 0; 1711e705c121SKalle Valo } 1712e705c121SKalle Valo } 1713e705c121SKalle Valo 1714e705c121SKalle Valo /* 1715e705c121SKalle Valo * allocate dram shared table, it is an aligned memory 1716e705c121SKalle Valo * block of ICT_SIZE. 1717e705c121SKalle Valo * also reset all data related to ICT table interrupt. 1718e705c121SKalle Valo */ 1719e705c121SKalle Valo int iwl_pcie_alloc_ict(struct iwl_trans *trans) 1720e705c121SKalle Valo { 1721e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1722e705c121SKalle Valo 1723e705c121SKalle Valo trans_pcie->ict_tbl = 1724e705c121SKalle Valo dma_zalloc_coherent(trans->dev, ICT_SIZE, 1725e705c121SKalle Valo &trans_pcie->ict_tbl_dma, 1726e705c121SKalle Valo GFP_KERNEL); 1727e705c121SKalle Valo if (!trans_pcie->ict_tbl) 1728e705c121SKalle Valo return -ENOMEM; 1729e705c121SKalle Valo 1730e705c121SKalle Valo /* just an API sanity check ... it is guaranteed to be aligned */ 1731e705c121SKalle Valo if (WARN_ON(trans_pcie->ict_tbl_dma & (ICT_SIZE - 1))) { 1732e705c121SKalle Valo iwl_pcie_free_ict(trans); 1733e705c121SKalle Valo return -EINVAL; 1734e705c121SKalle Valo } 1735e705c121SKalle Valo 1736e705c121SKalle Valo return 0; 1737e705c121SKalle Valo } 1738e705c121SKalle Valo 1739e705c121SKalle Valo /* Device is going up inform it about using ICT interrupt table, 1740e705c121SKalle Valo * also we need to tell the driver to start using ICT interrupt. 1741e705c121SKalle Valo */ 1742e705c121SKalle Valo void iwl_pcie_reset_ict(struct iwl_trans *trans) 1743e705c121SKalle Valo { 1744e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1745e705c121SKalle Valo u32 val; 1746e705c121SKalle Valo 1747e705c121SKalle Valo if (!trans_pcie->ict_tbl) 1748e705c121SKalle Valo return; 1749e705c121SKalle Valo 1750e705c121SKalle Valo spin_lock(&trans_pcie->irq_lock); 1751e705c121SKalle Valo iwl_disable_interrupts(trans); 1752e705c121SKalle Valo 1753e705c121SKalle Valo memset(trans_pcie->ict_tbl, 0, ICT_SIZE); 1754e705c121SKalle Valo 1755e705c121SKalle Valo val = trans_pcie->ict_tbl_dma >> ICT_SHIFT; 1756e705c121SKalle Valo 1757e705c121SKalle Valo val |= CSR_DRAM_INT_TBL_ENABLE | 1758e705c121SKalle Valo CSR_DRAM_INIT_TBL_WRAP_CHECK | 1759e705c121SKalle Valo CSR_DRAM_INIT_TBL_WRITE_POINTER; 1760e705c121SKalle Valo 1761e705c121SKalle Valo IWL_DEBUG_ISR(trans, "CSR_DRAM_INT_TBL_REG =0x%x\n", val); 1762e705c121SKalle Valo 1763e705c121SKalle Valo iwl_write32(trans, CSR_DRAM_INT_TBL_REG, val); 1764e705c121SKalle Valo trans_pcie->use_ict = true; 1765e705c121SKalle Valo trans_pcie->ict_index = 0; 1766e705c121SKalle Valo iwl_write32(trans, CSR_INT, trans_pcie->inta_mask); 1767e705c121SKalle Valo iwl_enable_interrupts(trans); 1768e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1769e705c121SKalle Valo } 1770e705c121SKalle Valo 1771e705c121SKalle Valo /* Device is going down disable ict interrupt usage */ 1772e705c121SKalle Valo void iwl_pcie_disable_ict(struct iwl_trans *trans) 1773e705c121SKalle Valo { 1774e705c121SKalle Valo struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); 1775e705c121SKalle Valo 1776e705c121SKalle Valo spin_lock(&trans_pcie->irq_lock); 1777e705c121SKalle Valo trans_pcie->use_ict = false; 1778e705c121SKalle Valo spin_unlock(&trans_pcie->irq_lock); 1779e705c121SKalle Valo } 1780e705c121SKalle Valo 1781e705c121SKalle Valo irqreturn_t iwl_pcie_isr(int irq, void *data) 1782e705c121SKalle Valo { 1783e705c121SKalle Valo struct iwl_trans *trans = data; 1784e705c121SKalle Valo 1785e705c121SKalle Valo if (!trans) 1786e705c121SKalle Valo return IRQ_NONE; 1787e705c121SKalle Valo 1788e705c121SKalle Valo /* Disable (but don't clear!) interrupts here to avoid 1789e705c121SKalle Valo * back-to-back ISRs and sporadic interrupts from our NIC. 1790e705c121SKalle Valo * If we have something to service, the tasklet will re-enable ints. 1791e705c121SKalle Valo * If we *don't* have something, we'll re-enable before leaving here. 1792e705c121SKalle Valo */ 1793e705c121SKalle Valo iwl_write32(trans, CSR_INT_MASK, 0x00000000); 1794e705c121SKalle Valo 1795e705c121SKalle Valo return IRQ_WAKE_THREAD; 1796e705c121SKalle Valo } 17972e5d4a8fSHaim Dreyfuss 17982e5d4a8fSHaim Dreyfuss irqreturn_t iwl_pcie_msix_isr(int irq, void *data) 17992e5d4a8fSHaim Dreyfuss { 18002e5d4a8fSHaim Dreyfuss return IRQ_WAKE_THREAD; 18012e5d4a8fSHaim Dreyfuss } 18022e5d4a8fSHaim Dreyfuss 18032e5d4a8fSHaim Dreyfuss irqreturn_t iwl_pcie_irq_msix_handler(int irq, void *dev_id) 18042e5d4a8fSHaim Dreyfuss { 18052e5d4a8fSHaim Dreyfuss struct msix_entry *entry = dev_id; 18062e5d4a8fSHaim Dreyfuss struct iwl_trans_pcie *trans_pcie = iwl_pcie_get_trans_pcie(entry); 18072e5d4a8fSHaim Dreyfuss struct iwl_trans *trans = trans_pcie->trans; 18082e5d4a8fSHaim Dreyfuss struct isr_statistics *isr_stats = isr_stats = &trans_pcie->isr_stats; 18092e5d4a8fSHaim Dreyfuss u32 inta_fh, inta_hw; 18102e5d4a8fSHaim Dreyfuss 18112e5d4a8fSHaim Dreyfuss lock_map_acquire(&trans->sync_cmd_lockdep_map); 18122e5d4a8fSHaim Dreyfuss 18132e5d4a8fSHaim Dreyfuss spin_lock(&trans_pcie->irq_lock); 18142e5d4a8fSHaim Dreyfuss inta_fh = iwl_read_direct32(trans, CSR_MSIX_FH_INT_CAUSES_AD); 18152e5d4a8fSHaim Dreyfuss inta_hw = iwl_read_direct32(trans, CSR_MSIX_HW_INT_CAUSES_AD); 18162e5d4a8fSHaim Dreyfuss /* 18172e5d4a8fSHaim Dreyfuss * Clear causes registers to avoid being handling the same cause. 18182e5d4a8fSHaim Dreyfuss */ 18192e5d4a8fSHaim Dreyfuss iwl_write_direct32(trans, CSR_MSIX_FH_INT_CAUSES_AD, inta_fh); 18202e5d4a8fSHaim Dreyfuss iwl_write_direct32(trans, CSR_MSIX_HW_INT_CAUSES_AD, inta_hw); 18212e5d4a8fSHaim Dreyfuss spin_unlock(&trans_pcie->irq_lock); 18222e5d4a8fSHaim Dreyfuss 18232e5d4a8fSHaim Dreyfuss if (unlikely(!(inta_fh | inta_hw))) { 18242e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "Ignore interrupt, inta == 0\n"); 18252e5d4a8fSHaim Dreyfuss lock_map_release(&trans->sync_cmd_lockdep_map); 18262e5d4a8fSHaim Dreyfuss return IRQ_NONE; 18272e5d4a8fSHaim Dreyfuss } 18282e5d4a8fSHaim Dreyfuss 18292e5d4a8fSHaim Dreyfuss if (iwl_have_debug_level(IWL_DL_ISR)) 18302e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "ISR inta_fh 0x%08x, enabled 0x%08x\n", 18312e5d4a8fSHaim Dreyfuss inta_fh, 18322e5d4a8fSHaim Dreyfuss iwl_read32(trans, CSR_MSIX_FH_INT_MASK_AD)); 18332e5d4a8fSHaim Dreyfuss 18342e5d4a8fSHaim Dreyfuss /* This "Tx" DMA channel is used only for loading uCode */ 18352e5d4a8fSHaim Dreyfuss if (inta_fh & MSIX_FH_INT_CAUSES_D2S_CH0_NUM) { 18362e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "uCode load interrupt\n"); 18372e5d4a8fSHaim Dreyfuss isr_stats->tx++; 18382e5d4a8fSHaim Dreyfuss /* 18392e5d4a8fSHaim Dreyfuss * Wake up uCode load routine, 18402e5d4a8fSHaim Dreyfuss * now that load is complete 18412e5d4a8fSHaim Dreyfuss */ 18422e5d4a8fSHaim Dreyfuss trans_pcie->ucode_write_complete = true; 18432e5d4a8fSHaim Dreyfuss wake_up(&trans_pcie->ucode_write_waitq); 18442e5d4a8fSHaim Dreyfuss } 18452e5d4a8fSHaim Dreyfuss 18462e5d4a8fSHaim Dreyfuss /* Error detected by uCode */ 18472e5d4a8fSHaim Dreyfuss if ((inta_fh & MSIX_FH_INT_CAUSES_FH_ERR) || 18482e5d4a8fSHaim Dreyfuss (inta_hw & MSIX_HW_INT_CAUSES_REG_SW_ERR)) { 18492e5d4a8fSHaim Dreyfuss IWL_ERR(trans, 18502e5d4a8fSHaim Dreyfuss "Microcode SW error detected. Restarting 0x%X.\n", 18512e5d4a8fSHaim Dreyfuss inta_fh); 18522e5d4a8fSHaim Dreyfuss isr_stats->sw++; 18532e5d4a8fSHaim Dreyfuss iwl_pcie_irq_handle_error(trans); 18542e5d4a8fSHaim Dreyfuss } 18552e5d4a8fSHaim Dreyfuss 18562e5d4a8fSHaim Dreyfuss /* After checking FH register check HW register */ 18572e5d4a8fSHaim Dreyfuss if (iwl_have_debug_level(IWL_DL_ISR)) 18582e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, 18592e5d4a8fSHaim Dreyfuss "ISR inta_hw 0x%08x, enabled 0x%08x\n", 18602e5d4a8fSHaim Dreyfuss inta_hw, 18612e5d4a8fSHaim Dreyfuss iwl_read32(trans, CSR_MSIX_HW_INT_MASK_AD)); 18622e5d4a8fSHaim Dreyfuss 18632e5d4a8fSHaim Dreyfuss /* Alive notification via Rx interrupt will do the real work */ 18642e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_ALIVE) { 18652e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "Alive interrupt\n"); 18662e5d4a8fSHaim Dreyfuss isr_stats->alive++; 18672e5d4a8fSHaim Dreyfuss } 18682e5d4a8fSHaim Dreyfuss 18692e5d4a8fSHaim Dreyfuss /* uCode wakes up after power-down sleep */ 18702e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_WAKEUP) { 18712e5d4a8fSHaim Dreyfuss IWL_DEBUG_ISR(trans, "Wakeup interrupt\n"); 18722e5d4a8fSHaim Dreyfuss iwl_pcie_rxq_check_wrptr(trans); 18732e5d4a8fSHaim Dreyfuss iwl_pcie_txq_check_wrptrs(trans); 18742e5d4a8fSHaim Dreyfuss 18752e5d4a8fSHaim Dreyfuss isr_stats->wakeup++; 18762e5d4a8fSHaim Dreyfuss } 18772e5d4a8fSHaim Dreyfuss 18782e5d4a8fSHaim Dreyfuss /* Chip got too hot and stopped itself */ 18792e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_CT_KILL) { 18802e5d4a8fSHaim Dreyfuss IWL_ERR(trans, "Microcode CT kill error detected.\n"); 18812e5d4a8fSHaim Dreyfuss isr_stats->ctkill++; 18822e5d4a8fSHaim Dreyfuss } 18832e5d4a8fSHaim Dreyfuss 18842e5d4a8fSHaim Dreyfuss /* HW RF KILL switch toggled */ 18852e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_RF_KILL) { 18862e5d4a8fSHaim Dreyfuss bool hw_rfkill; 18872e5d4a8fSHaim Dreyfuss 18882e5d4a8fSHaim Dreyfuss hw_rfkill = iwl_is_rfkill_set(trans); 18892e5d4a8fSHaim Dreyfuss IWL_WARN(trans, "RF_KILL bit toggled to %s.\n", 18902e5d4a8fSHaim Dreyfuss hw_rfkill ? "disable radio" : "enable radio"); 18912e5d4a8fSHaim Dreyfuss 18922e5d4a8fSHaim Dreyfuss isr_stats->rfkill++; 18932e5d4a8fSHaim Dreyfuss 18942e5d4a8fSHaim Dreyfuss mutex_lock(&trans_pcie->mutex); 18952e5d4a8fSHaim Dreyfuss iwl_trans_pcie_rf_kill(trans, hw_rfkill); 18962e5d4a8fSHaim Dreyfuss mutex_unlock(&trans_pcie->mutex); 18972e5d4a8fSHaim Dreyfuss if (hw_rfkill) { 18982e5d4a8fSHaim Dreyfuss set_bit(STATUS_RFKILL, &trans->status); 18992e5d4a8fSHaim Dreyfuss if (test_and_clear_bit(STATUS_SYNC_HCMD_ACTIVE, 19002e5d4a8fSHaim Dreyfuss &trans->status)) 19012e5d4a8fSHaim Dreyfuss IWL_DEBUG_RF_KILL(trans, 19022e5d4a8fSHaim Dreyfuss "Rfkill while SYNC HCMD in flight\n"); 19032e5d4a8fSHaim Dreyfuss wake_up(&trans_pcie->wait_command_queue); 19042e5d4a8fSHaim Dreyfuss } else { 19052e5d4a8fSHaim Dreyfuss clear_bit(STATUS_RFKILL, &trans->status); 19062e5d4a8fSHaim Dreyfuss } 19072e5d4a8fSHaim Dreyfuss } 19082e5d4a8fSHaim Dreyfuss 19092e5d4a8fSHaim Dreyfuss if (inta_hw & MSIX_HW_INT_CAUSES_REG_HW_ERR) { 19102e5d4a8fSHaim Dreyfuss IWL_ERR(trans, 19112e5d4a8fSHaim Dreyfuss "Hardware error detected. Restarting.\n"); 19122e5d4a8fSHaim Dreyfuss 19132e5d4a8fSHaim Dreyfuss isr_stats->hw++; 19142e5d4a8fSHaim Dreyfuss iwl_pcie_irq_handle_error(trans); 19152e5d4a8fSHaim Dreyfuss } 19162e5d4a8fSHaim Dreyfuss 19172e5d4a8fSHaim Dreyfuss iwl_pcie_clear_irq(trans, entry); 19182e5d4a8fSHaim Dreyfuss 19192e5d4a8fSHaim Dreyfuss lock_map_release(&trans->sync_cmd_lockdep_map); 19202e5d4a8fSHaim Dreyfuss 19212e5d4a8fSHaim Dreyfuss return IRQ_HANDLED; 19222e5d4a8fSHaim Dreyfuss } 1923