1 /* 2 * Adaptec AAC series RAID controller driver 3 * (c) Copyright 2001 Red Hat Inc. <alan@redhat.com> 4 * 5 * based on the old aacraid driver that is.. 6 * Adaptec aacraid device driver for Linux. 7 * 8 * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com) 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; see the file COPYING. If not, write to 22 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 23 * 24 * Module Name: 25 * dpcsup.c 26 * 27 * Abstract: All DPC processing routines for the cyclone board occur here. 28 * 29 * 30 */ 31 32 #include <linux/kernel.h> 33 #include <linux/init.h> 34 #include <linux/types.h> 35 #include <linux/sched.h> 36 #include <linux/pci.h> 37 #include <linux/spinlock.h> 38 #include <linux/slab.h> 39 #include <linux/completion.h> 40 #include <linux/blkdev.h> 41 #include <asm/semaphore.h> 42 43 #include "aacraid.h" 44 45 /** 46 * aac_response_normal - Handle command replies 47 * @q: Queue to read from 48 * 49 * This DPC routine will be run when the adapter interrupts us to let us 50 * know there is a response on our normal priority queue. We will pull off 51 * all QE there are and wake up all the waiters before exiting. We will 52 * take a spinlock out on the queue before operating on it. 53 */ 54 55 unsigned int aac_response_normal(struct aac_queue * q) 56 { 57 struct aac_dev * dev = q->dev; 58 struct aac_entry *entry; 59 struct hw_fib * hwfib; 60 struct fib * fib; 61 int consumed = 0; 62 unsigned long flags; 63 64 spin_lock_irqsave(q->lock, flags); 65 /* 66 * Keep pulling response QEs off the response queue and waking 67 * up the waiters until there are no more QEs. We then return 68 * back to the system. If no response was requesed we just 69 * deallocate the Fib here and continue. 70 */ 71 while(aac_consumer_get(dev, q, &entry)) 72 { 73 int fast; 74 u32 index = le32_to_cpu(entry->addr); 75 fast = index & 0x01; 76 fib = &dev->fibs[index >> 1]; 77 hwfib = fib->hw_fib; 78 79 aac_consumer_free(dev, q, HostNormRespQueue); 80 /* 81 * Remove this fib from the Outstanding I/O queue. 82 * But only if it has not already been timed out. 83 * 84 * If the fib has been timed out already, then just 85 * continue. The caller has already been notified that 86 * the fib timed out. 87 */ 88 if (!(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) { 89 list_del(&fib->queue); 90 dev->queues->queue[AdapNormCmdQueue].numpending--; 91 } else { 92 printk(KERN_WARNING "aacraid: FIB timeout (%x).\n", fib->flags); 93 printk(KERN_DEBUG"aacraid: hwfib=%p fib index=%i fib=%p\n",hwfib, hwfib->header.SenderData,fib); 94 continue; 95 } 96 spin_unlock_irqrestore(q->lock, flags); 97 98 if (fast) { 99 /* 100 * Doctor the fib 101 */ 102 *(u32 *)hwfib->data = cpu_to_le32(ST_OK); 103 hwfib->header.XferState |= cpu_to_le32(AdapterProcessed); 104 } 105 106 FIB_COUNTER_INCREMENT(aac_config.FibRecved); 107 108 if (hwfib->header.Command == cpu_to_le16(NuFileSystem)) 109 { 110 u32 *pstatus = (u32 *)hwfib->data; 111 if (*pstatus & cpu_to_le32(0xffff0000)) 112 *pstatus = cpu_to_le32(ST_OK); 113 } 114 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async)) 115 { 116 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected)) 117 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved); 118 else 119 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved); 120 /* 121 * NOTE: we cannot touch the fib after this 122 * call, because it may have been deallocated. 123 */ 124 fib->callback(fib->callback_data, fib); 125 } else { 126 unsigned long flagv; 127 spin_lock_irqsave(&fib->event_lock, flagv); 128 fib->done = 1; 129 up(&fib->event_wait); 130 spin_unlock_irqrestore(&fib->event_lock, flagv); 131 FIB_COUNTER_INCREMENT(aac_config.NormalRecved); 132 } 133 consumed++; 134 spin_lock_irqsave(q->lock, flags); 135 } 136 137 if (consumed > aac_config.peak_fibs) 138 aac_config.peak_fibs = consumed; 139 if (consumed == 0) 140 aac_config.zero_fibs++; 141 142 spin_unlock_irqrestore(q->lock, flags); 143 return 0; 144 } 145 146 147 /** 148 * aac_command_normal - handle commands 149 * @q: queue to process 150 * 151 * This DPC routine will be queued when the adapter interrupts us to 152 * let us know there is a command on our normal priority queue. We will 153 * pull off all QE there are and wake up all the waiters before exiting. 154 * We will take a spinlock out on the queue before operating on it. 155 */ 156 157 unsigned int aac_command_normal(struct aac_queue *q) 158 { 159 struct aac_dev * dev = q->dev; 160 struct aac_entry *entry; 161 unsigned long flags; 162 163 spin_lock_irqsave(q->lock, flags); 164 165 /* 166 * Keep pulling response QEs off the response queue and waking 167 * up the waiters until there are no more QEs. We then return 168 * back to the system. 169 */ 170 while(aac_consumer_get(dev, q, &entry)) 171 { 172 struct fib fibctx; 173 struct hw_fib * hw_fib; 174 u32 index; 175 struct fib *fib = &fibctx; 176 177 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib); 178 hw_fib = &dev->aif_base_va[index]; 179 180 /* 181 * Allocate a FIB at all costs. For non queued stuff 182 * we can just use the stack so we are happy. We need 183 * a fib object in order to manage the linked lists 184 */ 185 if (dev->aif_thread) 186 if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL) 187 fib = &fibctx; 188 189 memset(fib, 0, sizeof(struct fib)); 190 INIT_LIST_HEAD(&fib->fiblink); 191 fib->type = FSAFS_NTC_FIB_CONTEXT; 192 fib->size = sizeof(struct fib); 193 fib->hw_fib = hw_fib; 194 fib->data = hw_fib->data; 195 fib->dev = dev; 196 197 198 if (dev->aif_thread && fib != &fibctx) { 199 list_add_tail(&fib->fiblink, &q->cmdq); 200 aac_consumer_free(dev, q, HostNormCmdQueue); 201 wake_up_interruptible(&q->cmdready); 202 } else { 203 aac_consumer_free(dev, q, HostNormCmdQueue); 204 spin_unlock_irqrestore(q->lock, flags); 205 /* 206 * Set the status of this FIB 207 */ 208 *(u32 *)hw_fib->data = cpu_to_le32(ST_OK); 209 fib_adapter_complete(fib, sizeof(u32)); 210 spin_lock_irqsave(q->lock, flags); 211 } 212 } 213 spin_unlock_irqrestore(q->lock, flags); 214 return 0; 215 } 216