Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
[linux-2.6] / arch / sparc64 / kernel / pci_msi.c
1 /* pci_msi.c: Sparc64 MSI support common layer.
2  *
3  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4  */
5 #include <linux/kernel.h>
6 #include <linux/interrupt.h>
7 #include <linux/irq.h>
8
9 #include "pci_impl.h"
10
11 static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
12 {
13         struct sparc64_msiq_cookie *msiq_cookie = cookie;
14         struct pci_pbm_info *pbm = msiq_cookie->pbm;
15         unsigned long msiqid = msiq_cookie->msiqid;
16         const struct sparc64_msiq_ops *ops;
17         unsigned long orig_head, head;
18         int err;
19
20         ops = pbm->msi_ops;
21
22         err = ops->get_head(pbm, msiqid, &head);
23         if (unlikely(err < 0))
24                 goto err_get_head;
25
26         orig_head = head;
27         for (;;) {
28                 unsigned long msi;
29
30                 err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
31                 if (likely(err > 0)) {
32                         struct irq_desc *desc;
33                         unsigned int virt_irq;
34
35                         virt_irq = pbm->msi_irq_table[msi - pbm->msi_first];
36                         desc = irq_desc + virt_irq;
37
38                         desc->handle_irq(virt_irq, desc);
39                 }
40
41                 if (unlikely(err < 0))
42                         goto err_dequeue;
43
44                 if (err == 0)
45                         break;
46         }
47         if (likely(head != orig_head)) {
48                 err = ops->set_head(pbm, msiqid, head);
49                 if (unlikely(err < 0))
50                         goto err_set_head;
51         }
52         return IRQ_HANDLED;
53
54 err_get_head:
55         printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
56                msiqid, err);
57         goto err_out;
58
59 err_dequeue:
60         printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
61                "gives error %d\n",
62                head, msiqid, err);
63         goto err_out;
64
65 err_set_head:
66         printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
67                "gives error %d\n",
68                head, msiqid, err);
69         goto err_out;
70
71 err_out:
72         return IRQ_NONE;
73 }
74
75 static u32 pick_msiq(struct pci_pbm_info *pbm)
76 {
77         static DEFINE_SPINLOCK(rotor_lock);
78         unsigned long flags;
79         u32 ret, rotor;
80
81         spin_lock_irqsave(&rotor_lock, flags);
82
83         rotor = pbm->msiq_rotor;
84         ret = pbm->msiq_first + rotor;
85
86         if (++rotor >= pbm->msiq_num)
87                 rotor = 0;
88         pbm->msiq_rotor = rotor;
89
90         spin_unlock_irqrestore(&rotor_lock, flags);
91
92         return ret;
93 }
94
95
96 static int alloc_msi(struct pci_pbm_info *pbm)
97 {
98         int i;
99
100         for (i = 0; i < pbm->msi_num; i++) {
101                 if (!test_and_set_bit(i, pbm->msi_bitmap))
102                         return i + pbm->msi_first;
103         }
104
105         return -ENOENT;
106 }
107
108 static void free_msi(struct pci_pbm_info *pbm, int msi_num)
109 {
110         msi_num -= pbm->msi_first;
111         clear_bit(msi_num, pbm->msi_bitmap);
112 }
113
114 static struct irq_chip msi_irq = {
115         .typename       = "PCI-MSI",
116         .mask           = mask_msi_irq,
117         .unmask         = unmask_msi_irq,
118         .enable         = unmask_msi_irq,
119         .disable        = mask_msi_irq,
120         /* XXX affinity XXX */
121 };
122
123 int sparc64_setup_msi_irq(unsigned int *virt_irq_p,
124                           struct pci_dev *pdev,
125                           struct msi_desc *entry)
126 {
127         struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
128         const struct sparc64_msiq_ops *ops = pbm->msi_ops;
129         struct msi_msg msg;
130         int msi, err;
131         u32 msiqid;
132
133         *virt_irq_p = virt_irq_alloc(0, 0);
134         err = -ENOMEM;
135         if (!*virt_irq_p)
136                 goto out_err;
137
138         set_irq_chip_and_handler_name(*virt_irq_p, &msi_irq,
139                                       handle_simple_irq, "MSI");
140
141         err = alloc_msi(pbm);
142         if (unlikely(err < 0))
143                 goto out_virt_irq_free;
144
145         msi = err;
146
147         msiqid = pick_msiq(pbm);
148
149         err = ops->msi_setup(pbm, msiqid, msi,
150                              (entry->msi_attrib.is_64 ? 1 : 0));
151         if (err)
152                 goto out_msi_free;
153
154         pbm->msi_irq_table[msi - pbm->msi_first] = *virt_irq_p;
155
156         if (entry->msi_attrib.is_64) {
157                 msg.address_hi = pbm->msi64_start >> 32;
158                 msg.address_lo = pbm->msi64_start & 0xffffffff;
159         } else {
160                 msg.address_hi = 0;
161                 msg.address_lo = pbm->msi32_start;
162         }
163         msg.data = msi;
164
165         set_irq_msi(*virt_irq_p, entry);
166         write_msi_msg(*virt_irq_p, &msg);
167
168         return 0;
169
170 out_msi_free:
171         free_msi(pbm, msi);
172
173 out_virt_irq_free:
174         set_irq_chip(*virt_irq_p, NULL);
175         virt_irq_free(*virt_irq_p);
176         *virt_irq_p = 0;
177
178 out_err:
179         return err;
180 }
181
182 void sparc64_teardown_msi_irq(unsigned int virt_irq,
183                               struct pci_dev *pdev)
184 {
185         struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
186         const struct sparc64_msiq_ops *ops = pbm->msi_ops;
187         unsigned int msi_num;
188         int i, err;
189
190         for (i = 0; i < pbm->msi_num; i++) {
191                 if (pbm->msi_irq_table[i] == virt_irq)
192                         break;
193         }
194         if (i >= pbm->msi_num) {
195                 printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
196                        pbm->name, virt_irq);
197                 return;
198         }
199
200         msi_num = pbm->msi_first + i;
201         pbm->msi_irq_table[i] = ~0U;
202
203         err = ops->msi_teardown(pbm, msi_num);
204         if (err) {
205                 printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
206                        "irq %u, gives error %d\n",
207                        pbm->name, msi_num, virt_irq, err);
208                 return;
209         }
210
211         free_msi(pbm, msi_num);
212
213         set_irq_chip(virt_irq, NULL);
214         virt_irq_free(virt_irq);
215 }
216
217 static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
218 {
219         unsigned long size, bits_per_ulong;
220
221         bits_per_ulong = sizeof(unsigned long) * 8;
222         size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
223         size /= 8;
224         BUG_ON(size % sizeof(unsigned long));
225
226         pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
227         if (!pbm->msi_bitmap)
228                 return -ENOMEM;
229
230         return 0;
231 }
232
233 static void msi_bitmap_free(struct pci_pbm_info *pbm)
234 {
235         kfree(pbm->msi_bitmap);
236         pbm->msi_bitmap = NULL;
237 }
238
239 static int msi_table_alloc(struct pci_pbm_info *pbm)
240 {
241         int size, i;
242
243         size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
244         pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
245         if (!pbm->msiq_irq_cookies)
246                 return -ENOMEM;
247
248         for (i = 0; i < pbm->msiq_num; i++) {
249                 struct sparc64_msiq_cookie *p;
250
251                 p = &pbm->msiq_irq_cookies[i];
252                 p->pbm = pbm;
253                 p->msiqid = pbm->msiq_first + i;
254         }
255
256         size = pbm->msi_num * sizeof(unsigned int);
257         pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
258         if (!pbm->msi_irq_table) {
259                 kfree(pbm->msiq_irq_cookies);
260                 pbm->msiq_irq_cookies = NULL;
261                 return -ENOMEM;
262         }
263
264         return 0;
265 }
266
267 static void msi_table_free(struct pci_pbm_info *pbm)
268 {
269         kfree(pbm->msiq_irq_cookies);
270         pbm->msiq_irq_cookies = NULL;
271
272         kfree(pbm->msi_irq_table);
273         pbm->msi_irq_table = NULL;
274 }
275
276 static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
277                                  const struct sparc64_msiq_ops *ops,
278                                  unsigned long msiqid,
279                                  unsigned long devino)
280 {
281         int irq = ops->msiq_build_irq(pbm, msiqid, devino);
282         int err;
283
284         if (irq < 0)
285                 return irq;
286
287         err = request_irq(irq, sparc64_msiq_interrupt, 0,
288                           "MSIQ",
289                           &pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
290         if (err)
291                 return err;
292
293         return 0;
294 }
295
296 static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
297                                       const struct sparc64_msiq_ops *ops)
298 {
299         int i;
300
301         for (i = 0; i < pbm->msiq_num; i++) {
302                 unsigned long msiqid = i + pbm->msiq_first;
303                 unsigned long devino = i + pbm->msiq_first_devino;
304                 int err;
305
306                 err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
307                 if (err)
308                         return err;
309         }
310
311         return 0;
312 }
313
314 void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
315                           const struct sparc64_msiq_ops *ops)
316 {
317         const u32 *val;
318         int len;
319
320         val = of_get_property(pbm->prom_node, "#msi-eqs", &len);
321         if (!val || len != 4)
322                 goto no_msi;
323         pbm->msiq_num = *val;
324         if (pbm->msiq_num) {
325                 const struct msiq_prop {
326                         u32 first_msiq;
327                         u32 num_msiq;
328                         u32 first_devino;
329                 } *mqp;
330                 const struct msi_range_prop {
331                         u32 first_msi;
332                         u32 num_msi;
333                 } *mrng;
334                 const struct addr_range_prop {
335                         u32 msi32_high;
336                         u32 msi32_low;
337                         u32 msi32_len;
338                         u32 msi64_high;
339                         u32 msi64_low;
340                         u32 msi64_len;
341                 } *arng;
342
343                 val = of_get_property(pbm->prom_node, "msi-eq-size", &len);
344                 if (!val || len != 4)
345                         goto no_msi;
346
347                 pbm->msiq_ent_count = *val;
348
349                 mqp = of_get_property(pbm->prom_node,
350                                       "msi-eq-to-devino", &len);
351                 if (!mqp)
352                         mqp = of_get_property(pbm->prom_node,
353                                               "msi-eq-devino", &len);
354                 if (!mqp || len != sizeof(struct msiq_prop))
355                         goto no_msi;
356
357                 pbm->msiq_first = mqp->first_msiq;
358                 pbm->msiq_first_devino = mqp->first_devino;
359
360                 val = of_get_property(pbm->prom_node, "#msi", &len);
361                 if (!val || len != 4)
362                         goto no_msi;
363                 pbm->msi_num = *val;
364
365                 mrng = of_get_property(pbm->prom_node, "msi-ranges", &len);
366                 if (!mrng || len != sizeof(struct msi_range_prop))
367                         goto no_msi;
368                 pbm->msi_first = mrng->first_msi;
369
370                 val = of_get_property(pbm->prom_node, "msi-data-mask", &len);
371                 if (!val || len != 4)
372                         goto no_msi;
373                 pbm->msi_data_mask = *val;
374
375                 val = of_get_property(pbm->prom_node, "msix-data-width", &len);
376                 if (!val || len != 4)
377                         goto no_msi;
378                 pbm->msix_data_width = *val;
379
380                 arng = of_get_property(pbm->prom_node, "msi-address-ranges",
381                                        &len);
382                 if (!arng || len != sizeof(struct addr_range_prop))
383                         goto no_msi;
384                 pbm->msi32_start = ((u64)arng->msi32_high << 32) |
385                         (u64) arng->msi32_low;
386                 pbm->msi64_start = ((u64)arng->msi64_high << 32) |
387                         (u64) arng->msi64_low;
388                 pbm->msi32_len = arng->msi32_len;
389                 pbm->msi64_len = arng->msi64_len;
390
391                 if (msi_bitmap_alloc(pbm))
392                         goto no_msi;
393
394                 if (msi_table_alloc(pbm)) {
395                         msi_bitmap_free(pbm);
396                         goto no_msi;
397                 }
398
399                 if (ops->msiq_alloc(pbm)) {
400                         msi_table_free(pbm);
401                         msi_bitmap_free(pbm);
402                         goto no_msi;
403                 }
404
405                 if (sparc64_bringup_msi_queues(pbm, ops)) {
406                         ops->msiq_free(pbm);
407                         msi_table_free(pbm);
408                         msi_bitmap_free(pbm);
409                         goto no_msi;
410                 }
411
412                 printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
413                        "devino[0x%x]\n",
414                        pbm->name,
415                        pbm->msiq_first, pbm->msiq_num,
416                        pbm->msiq_ent_count,
417                        pbm->msiq_first_devino);
418                 printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
419                        "width[%u]\n",
420                        pbm->name,
421                        pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
422                        pbm->msix_data_width);
423                 printk(KERN_INFO "%s: MSI addr32[0x%lx:0x%x] "
424                        "addr64[0x%lx:0x%x]\n",
425                        pbm->name,
426                        pbm->msi32_start, pbm->msi32_len,
427                        pbm->msi64_start, pbm->msi64_len);
428                 printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
429                        pbm->name,
430                        __pa(pbm->msi_queues));
431
432                 pbm->msi_ops = ops;
433                 pbm->setup_msi_irq = sparc64_setup_msi_irq;
434                 pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
435         }
436         return;
437
438 no_msi:
439         pbm->msiq_num = 0;
440         printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
441 }