xref: /openbmc/linux/drivers/scsi/aacraid/dpcsup.c (revision b6dcefde)
1 /*
2  *	Adaptec AAC series RAID controller driver
3  *	(c) Copyright 2001 Red Hat Inc.
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/spinlock.h>
36 #include <linux/slab.h>
37 #include <linux/completion.h>
38 #include <linux/blkdev.h>
39 #include <linux/semaphore.h>
40 
41 #include "aacraid.h"
42 
43 /**
44  *	aac_response_normal	-	Handle command replies
45  *	@q: Queue to read from
46  *
47  *	This DPC routine will be run when the adapter interrupts us to let us
48  *	know there is a response on our normal priority queue. We will pull off
49  *	all QE there are and wake up all the waiters before exiting. We will
50  *	take a spinlock out on the queue before operating on it.
51  */
52 
53 unsigned int aac_response_normal(struct aac_queue * q)
54 {
55 	struct aac_dev * dev = q->dev;
56 	struct aac_entry *entry;
57 	struct hw_fib * hwfib;
58 	struct fib * fib;
59 	int consumed = 0;
60 	unsigned long flags, mflags;
61 
62 	spin_lock_irqsave(q->lock, flags);
63 	/*
64 	 *	Keep pulling response QEs off the response queue and waking
65 	 *	up the waiters until there are no more QEs. We then return
66 	 *	back to the system. If no response was requesed we just
67 	 *	deallocate the Fib here and continue.
68 	 */
69 	while(aac_consumer_get(dev, q, &entry))
70 	{
71 		int fast;
72 		u32 index = le32_to_cpu(entry->addr);
73 		fast = index & 0x01;
74 		fib = &dev->fibs[index >> 2];
75 		hwfib = fib->hw_fib_va;
76 
77 		aac_consumer_free(dev, q, HostNormRespQueue);
78 		/*
79 		 *	Remove this fib from the Outstanding I/O queue.
80 		 *	But only if it has not already been timed out.
81 		 *
82 		 *	If the fib has been timed out already, then just
83 		 *	continue. The caller has already been notified that
84 		 *	the fib timed out.
85 		 */
86 		dev->queues->queue[AdapNormCmdQueue].numpending--;
87 
88 		if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
89 			spin_unlock_irqrestore(q->lock, flags);
90 			aac_fib_complete(fib);
91 			aac_fib_free(fib);
92 			spin_lock_irqsave(q->lock, flags);
93 			continue;
94 		}
95 		spin_unlock_irqrestore(q->lock, flags);
96 
97 		if (fast) {
98 			/*
99 			 *	Doctor the fib
100 			 */
101 			*(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
102 			hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
103 		}
104 
105 		FIB_COUNTER_INCREMENT(aac_config.FibRecved);
106 
107 		if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
108 		{
109 			__le32 *pstatus = (__le32 *)hwfib->data;
110 			if (*pstatus & cpu_to_le32(0xffff0000))
111 				*pstatus = cpu_to_le32(ST_OK);
112 		}
113 		if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
114 		{
115 	        	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
116 				FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
117 			else
118 				FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
119 			/*
120 			 *	NOTE:  we cannot touch the fib after this
121 			 *	    call, because it may have been deallocated.
122 			 */
123 			fib->flags = 0;
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 			}
132 			spin_unlock_irqrestore(&fib->event_lock, flagv);
133 
134 			spin_lock_irqsave(&dev->manage_lock, mflags);
135 			dev->management_fib_count--;
136 			spin_unlock_irqrestore(&dev->manage_lock, mflags);
137 
138 			FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
139 			if (fib->done == 2) {
140 				spin_lock_irqsave(&fib->event_lock, flagv);
141 				fib->done = 0;
142 				spin_unlock_irqrestore(&fib->event_lock, flagv);
143 				aac_fib_complete(fib);
144 				aac_fib_free(fib);
145 			}
146 		}
147 		consumed++;
148 		spin_lock_irqsave(q->lock, flags);
149 	}
150 
151 	if (consumed > aac_config.peak_fibs)
152 		aac_config.peak_fibs = consumed;
153 	if (consumed == 0)
154 		aac_config.zero_fibs++;
155 
156 	spin_unlock_irqrestore(q->lock, flags);
157 	return 0;
158 }
159 
160 
161 /**
162  *	aac_command_normal	-	handle commands
163  *	@q: queue to process
164  *
165  *	This DPC routine will be queued when the adapter interrupts us to
166  *	let us know there is a command on our normal priority queue. We will
167  *	pull off all QE there are and wake up all the waiters before exiting.
168  *	We will take a spinlock out on the queue before operating on it.
169  */
170 
171 unsigned int aac_command_normal(struct aac_queue *q)
172 {
173 	struct aac_dev * dev = q->dev;
174 	struct aac_entry *entry;
175 	unsigned long flags;
176 
177 	spin_lock_irqsave(q->lock, flags);
178 
179 	/*
180 	 *	Keep pulling response QEs off the response queue and waking
181 	 *	up the waiters until there are no more QEs. We then return
182 	 *	back to the system.
183 	 */
184 	while(aac_consumer_get(dev, q, &entry))
185 	{
186 		struct fib fibctx;
187 		struct hw_fib * hw_fib;
188 		u32 index;
189 		struct fib *fib = &fibctx;
190 
191 		index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
192 		hw_fib = &dev->aif_base_va[index];
193 
194 		/*
195 		 *	Allocate a FIB at all costs. For non queued stuff
196 		 *	we can just use the stack so we are happy. We need
197 		 *	a fib object in order to manage the linked lists
198 		 */
199 		if (dev->aif_thread)
200 			if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
201 				fib = &fibctx;
202 
203 		memset(fib, 0, sizeof(struct fib));
204 		INIT_LIST_HEAD(&fib->fiblink);
205 		fib->type = FSAFS_NTC_FIB_CONTEXT;
206 		fib->size = sizeof(struct fib);
207 		fib->hw_fib_va = hw_fib;
208 		fib->data = hw_fib->data;
209 		fib->dev = dev;
210 
211 
212 		if (dev->aif_thread && fib != &fibctx) {
213 		        list_add_tail(&fib->fiblink, &q->cmdq);
214 	 	        aac_consumer_free(dev, q, HostNormCmdQueue);
215 		        wake_up_interruptible(&q->cmdready);
216 		} else {
217 	 	        aac_consumer_free(dev, q, HostNormCmdQueue);
218 			spin_unlock_irqrestore(q->lock, flags);
219 			/*
220 			 *	Set the status of this FIB
221 			 */
222 			*(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
223 			aac_fib_adapter_complete(fib, sizeof(u32));
224 			spin_lock_irqsave(q->lock, flags);
225 		}
226 	}
227 	spin_unlock_irqrestore(q->lock, flags);
228 	return 0;
229 }
230 
231 
232 /**
233  *	aac_intr_normal	-	Handle command replies
234  *	@dev: Device
235  *	@index: completion reference
236  *
237  *	This DPC routine will be run when the adapter interrupts us to let us
238  *	know there is a response on our normal priority queue. We will pull off
239  *	all QE there are and wake up all the waiters before exiting.
240  */
241 
242 unsigned int aac_intr_normal(struct aac_dev * dev, u32 index)
243 {
244 	unsigned long mflags;
245 	dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
246 	if ((index & 0x00000002L)) {
247 		struct hw_fib * hw_fib;
248 		struct fib * fib;
249 		struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
250 		unsigned long flags;
251 
252 		if (index == 0xFFFFFFFEL) /* Special Case */
253 			return 0;	  /* Do nothing */
254 		/*
255 		 *	Allocate a FIB. For non queued stuff we can just use
256 		 * the stack so we are happy. We need a fib object in order to
257 		 * manage the linked lists.
258 		 */
259 		if ((!dev->aif_thread)
260 		 || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
261 			return 1;
262 		if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
263 			kfree (fib);
264 			return 1;
265 		}
266 		memcpy(hw_fib, (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
267 		  (index & ~0x00000002L)), sizeof(struct hw_fib));
268 		INIT_LIST_HEAD(&fib->fiblink);
269 		fib->type = FSAFS_NTC_FIB_CONTEXT;
270 		fib->size = sizeof(struct fib);
271 		fib->hw_fib_va = hw_fib;
272 		fib->data = hw_fib->data;
273 		fib->dev = dev;
274 
275 		spin_lock_irqsave(q->lock, flags);
276 		list_add_tail(&fib->fiblink, &q->cmdq);
277 	        wake_up_interruptible(&q->cmdready);
278 		spin_unlock_irqrestore(q->lock, flags);
279 		return 1;
280 	} else {
281 		int fast = index & 0x01;
282 		struct fib * fib = &dev->fibs[index >> 2];
283 		struct hw_fib * hwfib = fib->hw_fib_va;
284 
285 		/*
286 		 *	Remove this fib from the Outstanding I/O queue.
287 		 *	But only if it has not already been timed out.
288 		 *
289 		 *	If the fib has been timed out already, then just
290 		 *	continue. The caller has already been notified that
291 		 *	the fib timed out.
292 		 */
293 		dev->queues->queue[AdapNormCmdQueue].numpending--;
294 
295 		if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
296 			aac_fib_complete(fib);
297 			aac_fib_free(fib);
298 			return 0;
299 		}
300 
301 		if (fast) {
302 			/*
303 			 *	Doctor the fib
304 			 */
305 			*(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
306 			hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
307 		}
308 
309 		FIB_COUNTER_INCREMENT(aac_config.FibRecved);
310 
311 		if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
312 		{
313 			__le32 *pstatus = (__le32 *)hwfib->data;
314 			if (*pstatus & cpu_to_le32(0xffff0000))
315 				*pstatus = cpu_to_le32(ST_OK);
316 		}
317 		if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
318 		{
319 	        	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
320 				FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
321 			else
322 				FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
323 			/*
324 			 *	NOTE:  we cannot touch the fib after this
325 			 *	    call, because it may have been deallocated.
326 			 */
327 			fib->flags = 0;
328 			fib->callback(fib->callback_data, fib);
329 		} else {
330 			unsigned long flagv;
331 	  		dprintk((KERN_INFO "event_wait up\n"));
332 			spin_lock_irqsave(&fib->event_lock, flagv);
333 			if (!fib->done) {
334 				fib->done = 1;
335 				up(&fib->event_wait);
336 			}
337 			spin_unlock_irqrestore(&fib->event_lock, flagv);
338 
339 			spin_lock_irqsave(&dev->manage_lock, mflags);
340 			dev->management_fib_count--;
341 			spin_unlock_irqrestore(&dev->manage_lock, mflags);
342 
343 			FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
344 			if (fib->done == 2) {
345 				spin_lock_irqsave(&fib->event_lock, flagv);
346 				fib->done = 0;
347 				spin_unlock_irqrestore(&fib->event_lock, flagv);
348 				aac_fib_complete(fib);
349 				aac_fib_free(fib);
350 			}
351 
352 		}
353 		return 0;
354 	}
355 }
356