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1da177e4 LT |
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 | } |