1 // SPDX-License-Identifier: GPL-2.0
2 /* pci_msi.c: Sparc64 MSI support common layer.
3 *
4 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
5 */
6 #include <linux/kernel.h>
7 #include <linux/interrupt.h>
8 #include <linux/slab.h>
9 #include <linux/irq.h>
10
11 #include "pci_impl.h"
12
sparc64_msiq_interrupt(int irq,void * cookie)13 static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
14 {
15 struct sparc64_msiq_cookie *msiq_cookie = cookie;
16 struct pci_pbm_info *pbm = msiq_cookie->pbm;
17 unsigned long msiqid = msiq_cookie->msiqid;
18 const struct sparc64_msiq_ops *ops;
19 unsigned long orig_head, head;
20 int err;
21
22 ops = pbm->msi_ops;
23
24 err = ops->get_head(pbm, msiqid, &head);
25 if (unlikely(err < 0))
26 goto err_get_head;
27
28 orig_head = head;
29 for (;;) {
30 unsigned long msi;
31
32 err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
33 if (likely(err > 0)) {
34 unsigned int irq;
35
36 irq = pbm->msi_irq_table[msi - pbm->msi_first];
37 generic_handle_irq(irq);
38 }
39
40 if (unlikely(err < 0))
41 goto err_dequeue;
42
43 if (err == 0)
44 break;
45 }
46 if (likely(head != orig_head)) {
47 err = ops->set_head(pbm, msiqid, head);
48 if (unlikely(err < 0))
49 goto err_set_head;
50 }
51 return IRQ_HANDLED;
52
53 err_get_head:
54 printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
55 msiqid, err);
56 goto err_out;
57
58 err_dequeue:
59 printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
60 "gives error %d\n",
61 head, msiqid, err);
62 goto err_out;
63
64 err_set_head:
65 printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
66 "gives error %d\n",
67 head, msiqid, err);
68 goto err_out;
69
70 err_out:
71 return IRQ_NONE;
72 }
73
pick_msiq(struct pci_pbm_info * pbm)74 static u32 pick_msiq(struct pci_pbm_info *pbm)
75 {
76 static DEFINE_SPINLOCK(rotor_lock);
77 unsigned long flags;
78 u32 ret, rotor;
79
80 spin_lock_irqsave(&rotor_lock, flags);
81
82 rotor = pbm->msiq_rotor;
83 ret = pbm->msiq_first + rotor;
84
85 if (++rotor >= pbm->msiq_num)
86 rotor = 0;
87 pbm->msiq_rotor = rotor;
88
89 spin_unlock_irqrestore(&rotor_lock, flags);
90
91 return ret;
92 }
93
94
alloc_msi(struct pci_pbm_info * pbm)95 static int alloc_msi(struct pci_pbm_info *pbm)
96 {
97 int i;
98
99 for (i = 0; i < pbm->msi_num; i++) {
100 if (!test_and_set_bit(i, pbm->msi_bitmap))
101 return i + pbm->msi_first;
102 }
103
104 return -ENOENT;
105 }
106
free_msi(struct pci_pbm_info * pbm,int msi_num)107 static void free_msi(struct pci_pbm_info *pbm, int msi_num)
108 {
109 msi_num -= pbm->msi_first;
110 clear_bit(msi_num, pbm->msi_bitmap);
111 }
112
113 static struct irq_chip msi_irq = {
114 .name = "PCI-MSI",
115 .irq_mask = pci_msi_mask_irq,
116 .irq_unmask = pci_msi_unmask_irq,
117 .irq_enable = pci_msi_unmask_irq,
118 .irq_disable = pci_msi_mask_irq,
119 /* XXX affinity XXX */
120 };
121
sparc64_setup_msi_irq(unsigned int * irq_p,struct pci_dev * pdev,struct msi_desc * entry)122 static int sparc64_setup_msi_irq(unsigned int *irq_p,
123 struct pci_dev *pdev,
124 struct msi_desc *entry)
125 {
126 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
127 const struct sparc64_msiq_ops *ops = pbm->msi_ops;
128 struct msi_msg msg;
129 int msi, err;
130 u32 msiqid;
131
132 *irq_p = irq_alloc(0, 0);
133 err = -ENOMEM;
134 if (!*irq_p)
135 goto out_err;
136
137 irq_set_chip_and_handler_name(*irq_p, &msi_irq, handle_simple_irq,
138 "MSI");
139
140 err = alloc_msi(pbm);
141 if (unlikely(err < 0))
142 goto out_irq_free;
143
144 msi = err;
145
146 msiqid = pick_msiq(pbm);
147
148 err = ops->msi_setup(pbm, msiqid, msi,
149 (entry->msi_attrib.is_64 ? 1 : 0));
150 if (err)
151 goto out_msi_free;
152
153 pbm->msi_irq_table[msi - pbm->msi_first] = *irq_p;
154
155 if (entry->msi_attrib.is_64) {
156 msg.address_hi = pbm->msi64_start >> 32;
157 msg.address_lo = pbm->msi64_start & 0xffffffff;
158 } else {
159 msg.address_hi = 0;
160 msg.address_lo = pbm->msi32_start;
161 }
162 msg.data = msi;
163
164 irq_set_msi_desc(*irq_p, entry);
165 pci_write_msi_msg(*irq_p, &msg);
166
167 return 0;
168
169 out_msi_free:
170 free_msi(pbm, msi);
171
172 out_irq_free:
173 irq_set_chip(*irq_p, NULL);
174 irq_free(*irq_p);
175 *irq_p = 0;
176
177 out_err:
178 return err;
179 }
180
sparc64_teardown_msi_irq(unsigned int irq,struct pci_dev * pdev)181 static void sparc64_teardown_msi_irq(unsigned int irq,
182 struct pci_dev *pdev)
183 {
184 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
185 const struct sparc64_msiq_ops *ops = pbm->msi_ops;
186 unsigned int msi_num;
187 int i, err;
188
189 for (i = 0; i < pbm->msi_num; i++) {
190 if (pbm->msi_irq_table[i] == irq)
191 break;
192 }
193 if (i >= pbm->msi_num) {
194 pci_err(pdev, "%s: teardown: No MSI for irq %u\n", pbm->name,
195 irq);
196 return;
197 }
198
199 msi_num = pbm->msi_first + i;
200 pbm->msi_irq_table[i] = ~0U;
201
202 err = ops->msi_teardown(pbm, msi_num);
203 if (err) {
204 pci_err(pdev, "%s: teardown: ops->teardown() on MSI %u, "
205 "irq %u, gives error %d\n", pbm->name, msi_num, irq,
206 err);
207 return;
208 }
209
210 free_msi(pbm, msi_num);
211
212 irq_set_chip(irq, NULL);
213 irq_free(irq);
214 }
215
msi_bitmap_alloc(struct pci_pbm_info * pbm)216 static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
217 {
218 unsigned long size, bits_per_ulong;
219
220 bits_per_ulong = sizeof(unsigned long) * 8;
221 size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
222 size /= 8;
223 BUG_ON(size % sizeof(unsigned long));
224
225 pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
226 if (!pbm->msi_bitmap)
227 return -ENOMEM;
228
229 return 0;
230 }
231
msi_bitmap_free(struct pci_pbm_info * pbm)232 static void msi_bitmap_free(struct pci_pbm_info *pbm)
233 {
234 kfree(pbm->msi_bitmap);
235 pbm->msi_bitmap = NULL;
236 }
237
msi_table_alloc(struct pci_pbm_info * pbm)238 static int msi_table_alloc(struct pci_pbm_info *pbm)
239 {
240 int size, i;
241
242 size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
243 pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
244 if (!pbm->msiq_irq_cookies)
245 return -ENOMEM;
246
247 for (i = 0; i < pbm->msiq_num; i++) {
248 struct sparc64_msiq_cookie *p;
249
250 p = &pbm->msiq_irq_cookies[i];
251 p->pbm = pbm;
252 p->msiqid = pbm->msiq_first + i;
253 }
254
255 size = pbm->msi_num * sizeof(unsigned int);
256 pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
257 if (!pbm->msi_irq_table) {
258 kfree(pbm->msiq_irq_cookies);
259 pbm->msiq_irq_cookies = NULL;
260 return -ENOMEM;
261 }
262
263 return 0;
264 }
265
msi_table_free(struct pci_pbm_info * pbm)266 static void msi_table_free(struct pci_pbm_info *pbm)
267 {
268 kfree(pbm->msiq_irq_cookies);
269 pbm->msiq_irq_cookies = NULL;
270
271 kfree(pbm->msi_irq_table);
272 pbm->msi_irq_table = NULL;
273 }
274
bringup_one_msi_queue(struct pci_pbm_info * pbm,const struct sparc64_msiq_ops * ops,unsigned long msiqid,unsigned long devino)275 static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
276 const struct sparc64_msiq_ops *ops,
277 unsigned long msiqid,
278 unsigned long devino)
279 {
280 int irq = ops->msiq_build_irq(pbm, msiqid, devino);
281 int err, nid;
282
283 if (irq < 0)
284 return irq;
285
286 nid = pbm->numa_node;
287 if (nid != -1) {
288 cpumask_t numa_mask;
289
290 cpumask_copy(&numa_mask, cpumask_of_node(nid));
291 irq_set_affinity(irq, &numa_mask);
292 }
293 err = request_irq(irq, sparc64_msiq_interrupt, 0,
294 "MSIQ",
295 &pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
296 if (err)
297 return err;
298
299 return 0;
300 }
301
sparc64_bringup_msi_queues(struct pci_pbm_info * pbm,const struct sparc64_msiq_ops * ops)302 static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
303 const struct sparc64_msiq_ops *ops)
304 {
305 int i;
306
307 for (i = 0; i < pbm->msiq_num; i++) {
308 unsigned long msiqid = i + pbm->msiq_first;
309 unsigned long devino = i + pbm->msiq_first_devino;
310 int err;
311
312 err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
313 if (err)
314 return err;
315 }
316
317 return 0;
318 }
319
sparc64_pbm_msi_init(struct pci_pbm_info * pbm,const struct sparc64_msiq_ops * ops)320 void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
321 const struct sparc64_msiq_ops *ops)
322 {
323 const u32 *val;
324 int len;
325
326 val = of_get_property(pbm->op->dev.of_node, "#msi-eqs", &len);
327 if (!val || len != 4)
328 goto no_msi;
329 pbm->msiq_num = *val;
330 if (pbm->msiq_num) {
331 const struct msiq_prop {
332 u32 first_msiq;
333 u32 num_msiq;
334 u32 first_devino;
335 } *mqp;
336 const struct msi_range_prop {
337 u32 first_msi;
338 u32 num_msi;
339 } *mrng;
340 const struct addr_range_prop {
341 u32 msi32_high;
342 u32 msi32_low;
343 u32 msi32_len;
344 u32 msi64_high;
345 u32 msi64_low;
346 u32 msi64_len;
347 } *arng;
348
349 val = of_get_property(pbm->op->dev.of_node, "msi-eq-size", &len);
350 if (!val || len != 4)
351 goto no_msi;
352
353 pbm->msiq_ent_count = *val;
354
355 mqp = of_get_property(pbm->op->dev.of_node,
356 "msi-eq-to-devino", &len);
357 if (!mqp)
358 mqp = of_get_property(pbm->op->dev.of_node,
359 "msi-eq-devino", &len);
360 if (!mqp || len != sizeof(struct msiq_prop))
361 goto no_msi;
362
363 pbm->msiq_first = mqp->first_msiq;
364 pbm->msiq_first_devino = mqp->first_devino;
365
366 val = of_get_property(pbm->op->dev.of_node, "#msi", &len);
367 if (!val || len != 4)
368 goto no_msi;
369 pbm->msi_num = *val;
370
371 mrng = of_get_property(pbm->op->dev.of_node, "msi-ranges", &len);
372 if (!mrng || len != sizeof(struct msi_range_prop))
373 goto no_msi;
374 pbm->msi_first = mrng->first_msi;
375
376 val = of_get_property(pbm->op->dev.of_node, "msi-data-mask", &len);
377 if (!val || len != 4)
378 goto no_msi;
379 pbm->msi_data_mask = *val;
380
381 val = of_get_property(pbm->op->dev.of_node, "msix-data-width", &len);
382 if (!val || len != 4)
383 goto no_msi;
384 pbm->msix_data_width = *val;
385
386 arng = of_get_property(pbm->op->dev.of_node, "msi-address-ranges",
387 &len);
388 if (!arng || len != sizeof(struct addr_range_prop))
389 goto no_msi;
390 pbm->msi32_start = ((u64)arng->msi32_high << 32) |
391 (u64) arng->msi32_low;
392 pbm->msi64_start = ((u64)arng->msi64_high << 32) |
393 (u64) arng->msi64_low;
394 pbm->msi32_len = arng->msi32_len;
395 pbm->msi64_len = arng->msi64_len;
396
397 if (msi_bitmap_alloc(pbm))
398 goto no_msi;
399
400 if (msi_table_alloc(pbm)) {
401 msi_bitmap_free(pbm);
402 goto no_msi;
403 }
404
405 if (ops->msiq_alloc(pbm)) {
406 msi_table_free(pbm);
407 msi_bitmap_free(pbm);
408 goto no_msi;
409 }
410
411 if (sparc64_bringup_msi_queues(pbm, ops)) {
412 ops->msiq_free(pbm);
413 msi_table_free(pbm);
414 msi_bitmap_free(pbm);
415 goto no_msi;
416 }
417
418 printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
419 "devino[0x%x]\n",
420 pbm->name,
421 pbm->msiq_first, pbm->msiq_num,
422 pbm->msiq_ent_count,
423 pbm->msiq_first_devino);
424 printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
425 "width[%u]\n",
426 pbm->name,
427 pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
428 pbm->msix_data_width);
429 printk(KERN_INFO "%s: MSI addr32[0x%llx:0x%x] "
430 "addr64[0x%llx:0x%x]\n",
431 pbm->name,
432 pbm->msi32_start, pbm->msi32_len,
433 pbm->msi64_start, pbm->msi64_len);
434 printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
435 pbm->name,
436 __pa(pbm->msi_queues));
437
438 pbm->msi_ops = ops;
439 pbm->setup_msi_irq = sparc64_setup_msi_irq;
440 pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
441 }
442 return;
443
444 no_msi:
445 pbm->msiq_num = 0;
446 printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
447 }
448
