aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/aacraid/dpcsup.c
blob: d81b2810f0f7d507fc86fa536d24309a83147316 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
/*
 *	Adaptec AAC series RAID controller driver
 *	(c) Copyright 2001 Red Hat Inc.
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2010 Adaptec, Inc.
 *               2010 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Module Name:
 *  dpcsup.c
 *
 * Abstract: All DPC processing routines for the cyclone board occur here.
 *
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/blkdev.h>
#include <linux/semaphore.h>

#include "aacraid.h"

/**
 *	aac_response_normal	-	Handle command replies
 *	@q: Queue to read from
 *
 *	This DPC routine will be run when the adapter interrupts us to let us
 *	know there is a response on our normal priority queue. We will pull off
 *	all QE there are and wake up all the waiters before exiting. We will
 *	take a spinlock out on the queue before operating on it.
 */

unsigned int aac_response_normal(struct aac_queue * q)
{
	struct aac_dev * dev = q->dev;
	struct aac_entry *entry;
	struct hw_fib * hwfib;
	struct fib * fib;
	int consumed = 0;
	unsigned long flags, mflags;

	spin_lock_irqsave(q->lock, flags);
	/*
	 *	Keep pulling response QEs off the response queue and waking
	 *	up the waiters until there are no more QEs. We then return
	 *	back to the system. If no response was requesed we just
	 *	deallocate the Fib here and continue.
	 */
	while(aac_consumer_get(dev, q, &entry))
	{
		int fast;
		u32 index = le32_to_cpu(entry->addr);
		fast = index & 0x01;
		fib = &dev->fibs[index >> 2];
		hwfib = fib->hw_fib_va;
		
		aac_consumer_free(dev, q, HostNormRespQueue);
		/*
		 *	Remove this fib from the Outstanding I/O queue.
		 *	But only if it has not already been timed out.
		 *
		 *	If the fib has been timed out already, then just 
		 *	continue. The caller has already been notified that
		 *	the fib timed out.
		 */
		dev->queues->queue[AdapNormCmdQueue].numpending--;

		if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
			spin_unlock_irqrestore(q->lock, flags);
			aac_fib_complete(fib);
			aac_fib_free(fib);
			spin_lock_irqsave(q->lock, flags);
			continue;
		}
		spin_unlock_irqrestore(q->lock, flags);

		if (fast) {
			/*
			 *	Doctor the fib
			 */
			*(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
			hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
			fib->flags |= FIB_CONTEXT_FLAG_FASTRESP;
		}

		FIB_COUNTER_INCREMENT(aac_config.FibRecved);

		if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
		{
			__le32 *pstatus = (__le32 *)hwfib->data;
			if (*pstatus & cpu_to_le32(0xffff0000))
				*pstatus = cpu_to_le32(ST_OK);
		}
		if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async)) 
		{
	        	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
				FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
			else 
				FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
			/*
			 *	NOTE:  we cannot touch the fib after this
			 *	    call, because it may have been deallocated.
			 */
			fib->flags &= FIB_CONTEXT_FLAG_FASTRESP;
			fib->callback(fib->callback_data, fib);
		} else {
			unsigned long flagv;
			spin_lock_irqsave(&fib->event_lock, flagv);
			if (!fib->done) {
				fib->done = 1;
				up(&fib->event_wait);
			}
			spin_unlock_irqrestore(&fib->event_lock, flagv);

			spin_lock_irqsave(&dev->manage_lock, mflags);
			dev->management_fib_count--;
			spin_unlock_irqrestore(&dev->manage_lock, mflags);

			FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
			if (fib->done == 2) {
				spin_lock_irqsave(&fib->event_lock, flagv);
				fib->done = 0;
				spin_unlock_irqrestore(&fib->event_lock, flagv);
				aac_fib_complete(fib);
				aac_fib_free(fib);
			}
		}
		consumed++;
		spin_lock_irqsave(q->lock, flags);
	}

	if (consumed > aac_config.peak_fibs)
		aac_config.peak_fibs = consumed;
	if (consumed == 0) 
		aac_config.zero_fibs++;

	spin_unlock_irqrestore(q->lock, flags);
	return 0;
}


/**
 *	aac_command_normal	-	handle commands
 *	@q: queue to process
 *
 *	This DPC routine will be queued when the adapter interrupts us to 
 *	let us know there is a command on our normal priority queue. We will 
 *	pull off all QE there are and wake up all the waiters before exiting.
 *	We will take a spinlock out on the queue before operating on it.
 */
 
unsigned int aac_command_normal(struct aac_queue *q)
{
	struct aac_dev * dev = q->dev;
	struct aac_entry *entry;
	unsigned long flags;

	spin_lock_irqsave(q->lock, flags);

	/*
	 *	Keep pulling response QEs off the response queue and waking
	 *	up the waiters until there are no more QEs. We then return
	 *	back to the system.
	 */
	while(aac_consumer_get(dev, q, &entry))
	{
		struct fib fibctx;
		struct hw_fib * hw_fib;
		u32 index;
		struct fib *fib = &fibctx;
		
		index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
		hw_fib = &dev->aif_base_va[index];
		
		/*
		 *	Allocate a FIB at all costs. For non queued stuff
		 *	we can just use the stack so we are happy. We need
		 *	a fib object in order to manage the linked lists
		 */
		if (dev->aif_thread)
			if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
				fib = &fibctx;
		
		memset(fib, 0, sizeof(struct fib));
		INIT_LIST_HEAD(&fib->fiblink);
		fib->type = FSAFS_NTC_FIB_CONTEXT;
		fib->size = sizeof(struct fib);
		fib->hw_fib_va = hw_fib;
		fib->data = hw_fib->data;
		fib->dev = dev;
		
				
		if (dev->aif_thread && fib != &fibctx) {
		        list_add_tail(&fib->fiblink, &q->cmdq);
	 	        aac_consumer_free(dev, q, HostNormCmdQueue);
		        wake_up_interruptible(&q->cmdready);
		} else {
	 	        aac_consumer_free(dev, q, HostNormCmdQueue);
			spin_unlock_irqrestore(q->lock, flags);
			/*
			 *	Set the status of this FIB
			 */
			*(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
			aac_fib_adapter_complete(fib, sizeof(u32));
			spin_lock_irqsave(q->lock, flags);
		}		
	}
	spin_unlock_irqrestore(q->lock, flags);
	return 0;
}

/*
 *
 * aac_aif_callback
 * @context: the context set in the fib - here it is scsi cmd
 * @fibptr: pointer to the fib
 *
 * Handles the AIFs - new method (SRC)
 *
 */

static void aac_aif_callback(void *context, struct fib * fibptr)
{
	struct fib *fibctx;
	struct aac_dev *dev;
	struct aac_aifcmd *cmd;
	int status;

	fibctx = (struct fib *)context;
	BUG_ON(fibptr == NULL);
	dev = fibptr->dev;

	if (fibptr->hw_fib_va->header.XferState &
	    cpu_to_le32(NoMoreAifDataAvailable)) {
		aac_fib_complete(fibptr);
		aac_fib_free(fibptr);
		return;
	}

	aac_intr_normal(dev, 0, 1, 0, fibptr->hw_fib_va);

	aac_fib_init(fibctx);
	cmd = (struct aac_aifcmd *) fib_data(fibctx);
	cmd->command = cpu_to_le32(AifReqEvent);

	status = aac_fib_send(AifRequest,
		fibctx,
		sizeof(struct hw_fib)-sizeof(struct aac_fibhdr),
		FsaNormal,
		0, 1,
		(fib_callback)aac_aif_callback, fibctx);
}


/**
 *	aac_intr_normal	-	Handle command replies
 *	@dev: Device
 *	@index: completion reference
 *
 *	This DPC routine will be run when the adapter interrupts us to let us
 *	know there is a response on our normal priority queue. We will pull off
 *	all QE there are and wake up all the waiters before exiting.
 */
unsigned int aac_intr_normal(struct aac_dev *dev, u32 index,
			int isAif, int isFastResponse, struct hw_fib *aif_fib)
{
	unsigned long mflags;
	dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
	if (isAif == 1) {	/* AIF - common */
		struct hw_fib * hw_fib;
		struct fib * fib;
		struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
		unsigned long flags;

		/*
		 *	Allocate a FIB. For non queued stuff we can just use
		 * the stack so we are happy. We need a fib object in order to
		 * manage the linked lists.
		 */
		if ((!dev->aif_thread)
		 || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
			return 1;
		if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
			kfree (fib);
			return 1;
		}
		if (aif_fib != NULL) {
			memcpy(hw_fib, aif_fib, sizeof(struct hw_fib));
		} else {
			memcpy(hw_fib,
				(struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
				index), sizeof(struct hw_fib));
		}
		INIT_LIST_HEAD(&fib->fiblink);
		fib->type = FSAFS_NTC_FIB_CONTEXT;
		fib->size = sizeof(struct fib);
		fib->hw_fib_va = hw_fib;
		fib->data = hw_fib->data;
		fib->dev = dev;
	
		spin_lock_irqsave(q->lock, flags);
		list_add_tail(&fib->fiblink, &q->cmdq);
	        wake_up_interruptible(&q->cmdready);
		spin_unlock_irqrestore(q->lock, flags);
		return 1;
	} else if (isAif == 2) {	/* AIF - new (SRC) */
		struct fib *fibctx;
		struct aac_aifcmd *cmd;

		fibctx = aac_fib_alloc(dev);
		if (!fibctx)
			return 1;
		aac_fib_init(fibctx);

		cmd = (struct aac_aifcmd *) fib_data(fibctx);
		cmd->command = cpu_to_le32(AifReqEvent);

		return aac_fib_send(AifRequest,
			fibctx,
			sizeof(struct hw_fib)-sizeof(struct aac_fibhdr),
			FsaNormal,
			0, 1,
			(fib_callback)aac_aif_callback, fibctx);
	} else {
		struct fib *fib = &dev->fibs[index];
		struct hw_fib * hwfib = fib->hw_fib_va;

		/*
		 *	Remove this fib from the Outstanding I/O queue.
		 *	But only if it has not already been timed out.
		 *
		 *	If the fib has been timed out already, then just 
		 *	continue. The caller has already been notified that
		 *	the fib timed out.
		 */
		dev->queues->queue[AdapNormCmdQueue].numpending--;

		if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
			aac_fib_complete(fib);
			aac_fib_free(fib);
			return 0;
		}

		if (isFastResponse) {
			/*
			 *	Doctor the fib
			 */
			*(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
			hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
			fib->flags |= FIB_CONTEXT_FLAG_FASTRESP;
		}

		FIB_COUNTER_INCREMENT(aac_config.FibRecved);

		if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
		{
			__le32 *pstatus = (__le32 *)hwfib->data;
			if (*pstatus & cpu_to_le32(0xffff0000))
				*pstatus = cpu_to_le32(ST_OK);
		}
		if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async)) 
		{
	        	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
				FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
			else 
				FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
			/*
			 *	NOTE:  we cannot touch the fib after this
			 *	    call, because it may have been deallocated.
			 */
			fib->flags &= FIB_CONTEXT_FLAG_FASTRESP;
			fib->callback(fib->callback_data, fib);
		} else {
			unsigned long flagv;
	  		dprintk((KERN_INFO "event_wait up\n"));
			spin_lock_irqsave(&fib->event_lock, flagv);
			if (!fib->done) {
				fib->done = 1;
				up(&fib->event_wait);
			}
			spin_unlock_irqrestore(&fib->event_lock, flagv);

			spin_lock_irqsave(&dev->manage_lock, mflags);
			dev->management_fib_count--;
			spin_unlock_irqrestore(&dev->manage_lock, mflags);

			FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
			if (fib->done == 2) {
				spin_lock_irqsave(&fib->event_lock, flagv);
				fib->done = 0;
				spin_unlock_irqrestore(&fib->event_lock, flagv);
				aac_fib_complete(fib);
				aac_fib_free(fib);
			}

		}
		return 0;
	}
}