fbf27f59a311029be9fa0917608f8410459c9b64
[linux-2.6.git] / drivers / scsi / aacraid / dpcsup.c
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) 2000-2007 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/pci.h>
36 #include <linux/spinlock.h>
37 #include <linux/slab.h>
38 #include <linux/completion.h>
39 #include <linux/blkdev.h>
40 #include <asm/semaphore.h>
41
42 #include "aacraid.h"
43
44 /**
45  *      aac_response_normal     -       Handle command replies
46  *      @q: Queue to read from
47  *
48  *      This DPC routine will be run when the adapter interrupts us to let us
49  *      know there is a response on our normal priority queue. We will pull off
50  *      all QE there are and wake up all the waiters before exiting. We will
51  *      take a spinlock out on the queue before operating on it.
52  */
53
54 unsigned int aac_response_normal(struct aac_queue * q)
55 {
56         struct aac_dev * dev = q->dev;
57         struct aac_entry *entry;
58         struct hw_fib * hwfib;
59         struct fib * fib;
60         int consumed = 0;
61         unsigned long flags;
62
63         spin_lock_irqsave(q->lock, flags);      
64         /*
65          *      Keep pulling response QEs off the response queue and waking
66          *      up the waiters until there are no more QEs. We then return
67          *      back to the system. If no response was requesed we just
68          *      deallocate the Fib here and continue.
69          */
70         while(aac_consumer_get(dev, q, &entry))
71         {
72                 int fast;
73                 u32 index = le32_to_cpu(entry->addr);
74                 fast = index & 0x01;
75                 fib = &dev->fibs[index >> 2];
76                 hwfib = fib->hw_fib_va;
77                 
78                 aac_consumer_free(dev, q, HostNormRespQueue);
79                 /*
80                  *      Remove this fib from the Outstanding I/O queue.
81                  *      But only if it has not already been timed out.
82                  *
83                  *      If the fib has been timed out already, then just 
84                  *      continue. The caller has already been notified that
85                  *      the fib timed out.
86                  */
87                 dev->queues->queue[AdapNormCmdQueue].numpending--;
88
89                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
90                         spin_unlock_irqrestore(q->lock, flags);
91                         aac_fib_complete(fib);
92                         aac_fib_free(fib);
93                         spin_lock_irqsave(q->lock, flags);
94                         continue;
95                 }
96                 spin_unlock_irqrestore(q->lock, flags);
97
98                 if (fast) {
99                         /*
100                          *      Doctor the fib
101                          */
102                         *(__le32 *)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                         __le32 *pstatus = (__le32 *)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                         if (!fib->done)
129                                 fib->done = 1;
130                         up(&fib->event_wait);
131                         spin_unlock_irqrestore(&fib->event_lock, flagv);
132                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
133                         if (fib->done == 2) {
134                                 aac_fib_complete(fib);
135                                 aac_fib_free(fib);
136                         }
137                 }
138                 consumed++;
139                 spin_lock_irqsave(q->lock, flags);
140         }
141
142         if (consumed > aac_config.peak_fibs)
143                 aac_config.peak_fibs = consumed;
144         if (consumed == 0) 
145                 aac_config.zero_fibs++;
146
147         spin_unlock_irqrestore(q->lock, flags);
148         return 0;
149 }
150
151
152 /**
153  *      aac_command_normal      -       handle commands
154  *      @q: queue to process
155  *
156  *      This DPC routine will be queued when the adapter interrupts us to 
157  *      let us know there is a command on our normal priority queue. We will 
158  *      pull off all QE there are and wake up all the waiters before exiting.
159  *      We will take a spinlock out on the queue before operating on it.
160  */
161  
162 unsigned int aac_command_normal(struct aac_queue *q)
163 {
164         struct aac_dev * dev = q->dev;
165         struct aac_entry *entry;
166         unsigned long flags;
167
168         spin_lock_irqsave(q->lock, flags);
169
170         /*
171          *      Keep pulling response QEs off the response queue and waking
172          *      up the waiters until there are no more QEs. We then return
173          *      back to the system.
174          */
175         while(aac_consumer_get(dev, q, &entry))
176         {
177                 struct fib fibctx;
178                 struct hw_fib * hw_fib;
179                 u32 index;
180                 struct fib *fib = &fibctx;
181                 
182                 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
183                 hw_fib = &dev->aif_base_va[index];
184                 
185                 /*
186                  *      Allocate a FIB at all costs. For non queued stuff
187                  *      we can just use the stack so we are happy. We need
188                  *      a fib object in order to manage the linked lists
189                  */
190                 if (dev->aif_thread)
191                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
192                                 fib = &fibctx;
193                 
194                 memset(fib, 0, sizeof(struct fib));
195                 INIT_LIST_HEAD(&fib->fiblink);
196                 fib->type = FSAFS_NTC_FIB_CONTEXT;
197                 fib->size = sizeof(struct fib);
198                 fib->hw_fib_va = hw_fib;
199                 fib->data = hw_fib->data;
200                 fib->dev = dev;
201                 
202                                 
203                 if (dev->aif_thread && fib != &fibctx) {
204                         list_add_tail(&fib->fiblink, &q->cmdq);
205                         aac_consumer_free(dev, q, HostNormCmdQueue);
206                         wake_up_interruptible(&q->cmdready);
207                 } else {
208                         aac_consumer_free(dev, q, HostNormCmdQueue);
209                         spin_unlock_irqrestore(q->lock, flags);
210                         /*
211                          *      Set the status of this FIB
212                          */
213                         *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
214                         aac_fib_adapter_complete(fib, sizeof(u32));
215                         spin_lock_irqsave(q->lock, flags);
216                 }               
217         }
218         spin_unlock_irqrestore(q->lock, flags);
219         return 0;
220 }
221
222
223 /**
224  *      aac_intr_normal -       Handle command replies
225  *      @dev: Device
226  *      @index: completion reference
227  *
228  *      This DPC routine will be run when the adapter interrupts us to let us
229  *      know there is a response on our normal priority queue. We will pull off
230  *      all QE there are and wake up all the waiters before exiting.
231  */
232
233 unsigned int aac_intr_normal(struct aac_dev * dev, u32 Index)
234 {
235         u32 index = le32_to_cpu(Index);
236
237         dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, Index));
238         if ((index & 0x00000002L)) {
239                 struct hw_fib * hw_fib;
240                 struct fib * fib;
241                 struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
242                 unsigned long flags;
243
244                 if (index == 0xFFFFFFFEL) /* Special Case */
245                         return 0;         /* Do nothing */
246                 /*
247                  *      Allocate a FIB. For non queued stuff we can just use
248                  * the stack so we are happy. We need a fib object in order to
249                  * manage the linked lists.
250                  */
251                 if ((!dev->aif_thread)
252                  || (!(fib = kmalloc(sizeof(struct fib),GFP_ATOMIC))))
253                         return 1;
254                 if (!(hw_fib = kmalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
255                         kfree (fib);
256                         return 1;
257                 }
258                 memset(hw_fib, 0, sizeof(struct hw_fib));
259                 memcpy(hw_fib, (struct hw_fib *)(((ptrdiff_t)(dev->regs.sa)) +
260                   (index & ~0x00000002L)), sizeof(struct hw_fib));
261                 memset(fib, 0, sizeof(struct fib));
262                 INIT_LIST_HEAD(&fib->fiblink);
263                 fib->type = FSAFS_NTC_FIB_CONTEXT;
264                 fib->size = sizeof(struct fib);
265                 fib->hw_fib_va = hw_fib;
266                 fib->data = hw_fib->data;
267                 fib->dev = dev;
268         
269                 spin_lock_irqsave(q->lock, flags);
270                 list_add_tail(&fib->fiblink, &q->cmdq);
271                 wake_up_interruptible(&q->cmdready);
272                 spin_unlock_irqrestore(q->lock, flags);
273                 return 1;
274         } else {
275                 int fast = index & 0x01;
276                 struct fib * fib = &dev->fibs[index >> 2];
277                 struct hw_fib * hwfib = fib->hw_fib_va;
278
279                 /*
280                  *      Remove this fib from the Outstanding I/O queue.
281                  *      But only if it has not already been timed out.
282                  *
283                  *      If the fib has been timed out already, then just 
284                  *      continue. The caller has already been notified that
285                  *      the fib timed out.
286                  */
287                 dev->queues->queue[AdapNormCmdQueue].numpending--;
288
289                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
290                         aac_fib_complete(fib);
291                         aac_fib_free(fib);
292                         return 0;
293                 }
294
295                 if (fast) {
296                         /*
297                          *      Doctor the fib
298                          */
299                         *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
300                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
301                 }
302
303                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
304
305                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
306                 {
307                         u32 *pstatus = (u32 *)hwfib->data;
308                         if (*pstatus & cpu_to_le32(0xffff0000))
309                                 *pstatus = cpu_to_le32(ST_OK);
310                 }
311                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async)) 
312                 {
313                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
314                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
315                         else 
316                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
317                         /*
318                          *      NOTE:  we cannot touch the fib after this
319                          *          call, because it may have been deallocated.
320                          */
321                         fib->callback(fib->callback_data, fib);
322                 } else {
323                         unsigned long flagv;
324                         dprintk((KERN_INFO "event_wait up\n"));
325                         spin_lock_irqsave(&fib->event_lock, flagv);
326                         if (!fib->done)
327                                 fib->done = 1;
328                         up(&fib->event_wait);
329                         spin_unlock_irqrestore(&fib->event_lock, flagv);
330                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
331                 }
332                 return 0;
333         }
334 }