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4
5#include <linux/kernel.h>
6#include <linux/interrupt.h>
7#include <linux/slab.h>
8#include <linux/irq.h>
9
10#include "pci_impl.h"
11
12static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
13{
14 struct sparc64_msiq_cookie *msiq_cookie = cookie;
15 struct pci_pbm_info *pbm = msiq_cookie->pbm;
16 unsigned long msiqid = msiq_cookie->msiqid;
17 const struct sparc64_msiq_ops *ops;
18 unsigned long orig_head, head;
19 int err;
20
21 ops = pbm->msi_ops;
22
23 err = ops->get_head(pbm, msiqid, &head);
24 if (unlikely(err < 0))
25 goto err_get_head;
26
27 orig_head = head;
28 for (;;) {
29 unsigned long msi;
30
31 err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
32 if (likely(err > 0)) {
33 unsigned int irq;
34
35 irq = pbm->msi_irq_table[msi - pbm->msi_first];
36 generic_handle_irq(irq);
37 }
38
39 if (unlikely(err < 0))
40 goto err_dequeue;
41
42 if (err == 0)
43 break;
44 }
45 if (likely(head != orig_head)) {
46 err = ops->set_head(pbm, msiqid, head);
47 if (unlikely(err < 0))
48 goto err_set_head;
49 }
50 return IRQ_HANDLED;
51
52err_get_head:
53 printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
54 msiqid, err);
55 goto err_out;
56
57err_dequeue:
58 printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
59 "gives error %d\n",
60 head, msiqid, err);
61 goto err_out;
62
63err_set_head:
64 printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
65 "gives error %d\n",
66 head, msiqid, err);
67 goto err_out;
68
69err_out:
70 return IRQ_NONE;
71}
72
73static u32 pick_msiq(struct pci_pbm_info *pbm)
74{
75 static DEFINE_SPINLOCK(rotor_lock);
76 unsigned long flags;
77 u32 ret, rotor;
78
79 spin_lock_irqsave(&rotor_lock, flags);
80
81 rotor = pbm->msiq_rotor;
82 ret = pbm->msiq_first + rotor;
83
84 if (++rotor >= pbm->msiq_num)
85 rotor = 0;
86 pbm->msiq_rotor = rotor;
87
88 spin_unlock_irqrestore(&rotor_lock, flags);
89
90 return ret;
91}
92
93
94static int alloc_msi(struct pci_pbm_info *pbm)
95{
96 int i;
97
98 for (i = 0; i < pbm->msi_num; i++) {
99 if (!test_and_set_bit(i, pbm->msi_bitmap))
100 return i + pbm->msi_first;
101 }
102
103 return -ENOENT;
104}
105
106static void free_msi(struct pci_pbm_info *pbm, int msi_num)
107{
108 msi_num -= pbm->msi_first;
109 clear_bit(msi_num, pbm->msi_bitmap);
110}
111
112static struct irq_chip msi_irq = {
113 .name = "PCI-MSI",
114 .irq_mask = pci_msi_mask_irq,
115 .irq_unmask = pci_msi_unmask_irq,
116 .irq_enable = pci_msi_unmask_irq,
117 .irq_disable = pci_msi_mask_irq,
118
119};
120
121static int sparc64_setup_msi_irq(unsigned int *irq_p,
122 struct pci_dev *pdev,
123 struct msi_desc *entry)
124{
125 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
126 const struct sparc64_msiq_ops *ops = pbm->msi_ops;
127 struct msi_msg msg;
128 int msi, err;
129 u32 msiqid;
130
131 *irq_p = irq_alloc(0, 0);
132 err = -ENOMEM;
133 if (!*irq_p)
134 goto out_err;
135
136 irq_set_chip_and_handler_name(*irq_p, &msi_irq, handle_simple_irq,
137 "MSI");
138
139 err = alloc_msi(pbm);
140 if (unlikely(err < 0))
141 goto out_irq_free;
142
143 msi = err;
144
145 msiqid = pick_msiq(pbm);
146
147 err = ops->msi_setup(pbm, msiqid, msi,
148 (entry->msi_attrib.is_64 ? 1 : 0));
149 if (err)
150 goto out_msi_free;
151
152 pbm->msi_irq_table[msi - pbm->msi_first] = *irq_p;
153
154 if (entry->msi_attrib.is_64) {
155 msg.address_hi = pbm->msi64_start >> 32;
156 msg.address_lo = pbm->msi64_start & 0xffffffff;
157 } else {
158 msg.address_hi = 0;
159 msg.address_lo = pbm->msi32_start;
160 }
161 msg.data = msi;
162
163 irq_set_msi_desc(*irq_p, entry);
164 pci_write_msi_msg(*irq_p, &msg);
165
166 return 0;
167
168out_msi_free:
169 free_msi(pbm, msi);
170
171out_irq_free:
172 irq_set_chip(*irq_p, NULL);
173 irq_free(*irq_p);
174 *irq_p = 0;
175
176out_err:
177 return err;
178}
179
180static void sparc64_teardown_msi_irq(unsigned int irq,
181 struct pci_dev *pdev)
182{
183 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
184 const struct sparc64_msiq_ops *ops = pbm->msi_ops;
185 unsigned int msi_num;
186 int i, err;
187
188 for (i = 0; i < pbm->msi_num; i++) {
189 if (pbm->msi_irq_table[i] == irq)
190 break;
191 }
192 if (i >= pbm->msi_num) {
193 printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
194 pbm->name, irq);
195 return;
196 }
197
198 msi_num = pbm->msi_first + i;
199 pbm->msi_irq_table[i] = ~0U;
200
201 err = ops->msi_teardown(pbm, msi_num);
202 if (err) {
203 printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
204 "irq %u, gives error %d\n",
205 pbm->name, msi_num, irq, err);
206 return;
207 }
208
209 free_msi(pbm, msi_num);
210
211 irq_set_chip(irq, NULL);
212 irq_free(irq);
213}
214
215static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
216{
217 unsigned long size, bits_per_ulong;
218
219 bits_per_ulong = sizeof(unsigned long) * 8;
220 size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
221 size /= 8;
222 BUG_ON(size % sizeof(unsigned long));
223
224 pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
225 if (!pbm->msi_bitmap)
226 return -ENOMEM;
227
228 return 0;
229}
230
231static void msi_bitmap_free(struct pci_pbm_info *pbm)
232{
233 kfree(pbm->msi_bitmap);
234 pbm->msi_bitmap = NULL;
235}
236
237static int msi_table_alloc(struct pci_pbm_info *pbm)
238{
239 int size, i;
240
241 size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
242 pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
243 if (!pbm->msiq_irq_cookies)
244 return -ENOMEM;
245
246 for (i = 0; i < pbm->msiq_num; i++) {
247 struct sparc64_msiq_cookie *p;
248
249 p = &pbm->msiq_irq_cookies[i];
250 p->pbm = pbm;
251 p->msiqid = pbm->msiq_first + i;
252 }
253
254 size = pbm->msi_num * sizeof(unsigned int);
255 pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
256 if (!pbm->msi_irq_table) {
257 kfree(pbm->msiq_irq_cookies);
258 pbm->msiq_irq_cookies = NULL;
259 return -ENOMEM;
260 }
261
262 return 0;
263}
264
265static void msi_table_free(struct pci_pbm_info *pbm)
266{
267 kfree(pbm->msiq_irq_cookies);
268 pbm->msiq_irq_cookies = NULL;
269
270 kfree(pbm->msi_irq_table);
271 pbm->msi_irq_table = NULL;
272}
273
274static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
275 const struct sparc64_msiq_ops *ops,
276 unsigned long msiqid,
277 unsigned long devino)
278{
279 int irq = ops->msiq_build_irq(pbm, msiqid, devino);
280 int err, nid;
281
282 if (irq < 0)
283 return irq;
284
285 nid = pbm->numa_node;
286 if (nid != -1) {
287 cpumask_t numa_mask;
288
289 cpumask_copy(&numa_mask, cpumask_of_node(nid));
290 irq_set_affinity(irq, &numa_mask);
291 }
292 err = request_irq(irq, sparc64_msiq_interrupt, 0,
293 "MSIQ",
294 &pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
295 if (err)
296 return err;
297
298 return 0;
299}
300
301static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
302 const struct sparc64_msiq_ops *ops)
303{
304 int i;
305
306 for (i = 0; i < pbm->msiq_num; i++) {
307 unsigned long msiqid = i + pbm->msiq_first;
308 unsigned long devino = i + pbm->msiq_first_devino;
309 int err;
310
311 err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
312 if (err)
313 return err;
314 }
315
316 return 0;
317}
318
319void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
320 const struct sparc64_msiq_ops *ops)
321{
322 const u32 *val;
323 int len;
324
325 val = of_get_property(pbm->op->dev.of_node, "#msi-eqs", &len);
326 if (!val || len != 4)
327 goto no_msi;
328 pbm->msiq_num = *val;
329 if (pbm->msiq_num) {
330 const struct msiq_prop {
331 u32 first_msiq;
332 u32 num_msiq;
333 u32 first_devino;
334 } *mqp;
335 const struct msi_range_prop {
336 u32 first_msi;
337 u32 num_msi;
338 } *mrng;
339 const struct addr_range_prop {
340 u32 msi32_high;
341 u32 msi32_low;
342 u32 msi32_len;
343 u32 msi64_high;
344 u32 msi64_low;
345 u32 msi64_len;
346 } *arng;
347
348 val = of_get_property(pbm->op->dev.of_node, "msi-eq-size", &len);
349 if (!val || len != 4)
350 goto no_msi;
351
352 pbm->msiq_ent_count = *val;
353
354 mqp = of_get_property(pbm->op->dev.of_node,
355 "msi-eq-to-devino", &len);
356 if (!mqp)
357 mqp = of_get_property(pbm->op->dev.of_node,
358 "msi-eq-devino", &len);
359 if (!mqp || len != sizeof(struct msiq_prop))
360 goto no_msi;
361
362 pbm->msiq_first = mqp->first_msiq;
363 pbm->msiq_first_devino = mqp->first_devino;
364
365 val = of_get_property(pbm->op->dev.of_node, "#msi", &len);
366 if (!val || len != 4)
367 goto no_msi;
368 pbm->msi_num = *val;
369
370 mrng = of_get_property(pbm->op->dev.of_node, "msi-ranges", &len);
371 if (!mrng || len != sizeof(struct msi_range_prop))
372 goto no_msi;
373 pbm->msi_first = mrng->first_msi;
374
375 val = of_get_property(pbm->op->dev.of_node, "msi-data-mask", &len);
376 if (!val || len != 4)
377 goto no_msi;
378 pbm->msi_data_mask = *val;
379
380 val = of_get_property(pbm->op->dev.of_node, "msix-data-width", &len);
381 if (!val || len != 4)
382 goto no_msi;
383 pbm->msix_data_width = *val;
384
385 arng = of_get_property(pbm->op->dev.of_node, "msi-address-ranges",
386 &len);
387 if (!arng || len != sizeof(struct addr_range_prop))
388 goto no_msi;
389 pbm->msi32_start = ((u64)arng->msi32_high << 32) |
390 (u64) arng->msi32_low;
391 pbm->msi64_start = ((u64)arng->msi64_high << 32) |
392 (u64) arng->msi64_low;
393 pbm->msi32_len = arng->msi32_len;
394 pbm->msi64_len = arng->msi64_len;
395
396 if (msi_bitmap_alloc(pbm))
397 goto no_msi;
398
399 if (msi_table_alloc(pbm)) {
400 msi_bitmap_free(pbm);
401 goto no_msi;
402 }
403
404 if (ops->msiq_alloc(pbm)) {
405 msi_table_free(pbm);
406 msi_bitmap_free(pbm);
407 goto no_msi;
408 }
409
410 if (sparc64_bringup_msi_queues(pbm, ops)) {
411 ops->msiq_free(pbm);
412 msi_table_free(pbm);
413 msi_bitmap_free(pbm);
414 goto no_msi;
415 }
416
417 printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
418 "devino[0x%x]\n",
419 pbm->name,
420 pbm->msiq_first, pbm->msiq_num,
421 pbm->msiq_ent_count,
422 pbm->msiq_first_devino);
423 printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
424 "width[%u]\n",
425 pbm->name,
426 pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
427 pbm->msix_data_width);
428 printk(KERN_INFO "%s: MSI addr32[0x%llx:0x%x] "
429 "addr64[0x%llx:0x%x]\n",
430 pbm->name,
431 pbm->msi32_start, pbm->msi32_len,
432 pbm->msi64_start, pbm->msi64_len);
433 printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
434 pbm->name,
435 __pa(pbm->msi_queues));
436
437 pbm->msi_ops = ops;
438 pbm->setup_msi_irq = sparc64_setup_msi_irq;
439 pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
440 }
441 return;
442
443no_msi:
444 pbm->msiq_num = 0;
445 printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
446}
447
