summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/pci_msi.c
blob: 30982e9ab62669ae90ce804c977b3cdb7b20c6e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
/* pci_msi.c: Sparc64 MSI support common layer.
 *
 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
 */
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/irq.h>

#include "pci_impl.h"

static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
{
	struct sparc64_msiq_cookie *msiq_cookie = cookie;
	struct pci_pbm_info *pbm = msiq_cookie->pbm;
	unsigned long msiqid = msiq_cookie->msiqid;
	const struct sparc64_msiq_ops *ops;
	unsigned long orig_head, head;
	int err;

	ops = pbm->msi_ops;

	err = ops->get_head(pbm, msiqid, &head);
	if (unlikely(err < 0))
		goto err_get_head;

	orig_head = head;
	for (;;) {
		unsigned long msi;

		err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
		if (likely(err > 0)) {
			unsigned int irq;

			irq = pbm->msi_irq_table[msi - pbm->msi_first];
			generic_handle_irq(irq);
		}

		if (unlikely(err < 0))
			goto err_dequeue;

		if (err == 0)
			break;
	}
	if (likely(head != orig_head)) {
		err = ops->set_head(pbm, msiqid, head);
		if (unlikely(err < 0))
			goto err_set_head;
	}
	return IRQ_HANDLED;

err_get_head:
	printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
	       msiqid, err);
	goto err_out;

err_dequeue:
	printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
	       "gives error %d\n",
	       head, msiqid, err);
	goto err_out;

err_set_head:
	printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
	       "gives error %d\n",
	       head, msiqid, err);
	goto err_out;

err_out:
	return IRQ_NONE;
}

static u32 pick_msiq(struct pci_pbm_info *pbm)
{
	static DEFINE_SPINLOCK(rotor_lock);
	unsigned long flags;
	u32 ret, rotor;

	spin_lock_irqsave(&rotor_lock, flags);

	rotor = pbm->msiq_rotor;
	ret = pbm->msiq_first + rotor;

	if (++rotor >= pbm->msiq_num)
		rotor = 0;
	pbm->msiq_rotor = rotor;

	spin_unlock_irqrestore(&rotor_lock, flags);

	return ret;
}


static int alloc_msi(struct pci_pbm_info *pbm)
{
	int i;

	for (i = 0; i < pbm->msi_num; i++) {
		if (!test_and_set_bit(i, pbm->msi_bitmap))
			return i + pbm->msi_first;
	}

	return -ENOENT;
}

static void free_msi(struct pci_pbm_info *pbm, int msi_num)
{
	msi_num -= pbm->msi_first;
	clear_bit(msi_num, pbm->msi_bitmap);
}

static struct irq_chip msi_irq = {
	.name		= "PCI-MSI",
	.irq_mask	= mask_msi_irq,
	.irq_unmask	= unmask_msi_irq,
	.irq_enable	= unmask_msi_irq,
	.irq_disable	= mask_msi_irq,
	/* XXX affinity XXX */
};

static int sparc64_setup_msi_irq(unsigned int *irq_p,
				 struct pci_dev *pdev,
				 struct msi_desc *entry)
{
	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
	const struct sparc64_msiq_ops *ops = pbm->msi_ops;
	struct msi_msg msg;
	int msi, err;
	u32 msiqid;

	*irq_p = irq_alloc(0, 0);
	err = -ENOMEM;
	if (!*irq_p)
		goto out_err;

	irq_set_chip_and_handler_name(*irq_p, &msi_irq, handle_simple_irq,
				      "MSI");

	err = alloc_msi(pbm);
	if (unlikely(err < 0))
		goto out_irq_free;

	msi = err;

	msiqid = pick_msiq(pbm);

	err = ops->msi_setup(pbm, msiqid, msi,
			     (entry->msi_attrib.is_64 ? 1 : 0));
	if (err)
		goto out_msi_free;

	pbm->msi_irq_table[msi - pbm->msi_first] = *irq_p;

	if (entry->msi_attrib.is_64) {
		msg.address_hi = pbm->msi64_start >> 32;
		msg.address_lo = pbm->msi64_start & 0xffffffff;
	} else {
		msg.address_hi = 0;
		msg.address_lo = pbm->msi32_start;
	}
	msg.data = msi;

	irq_set_msi_desc(*irq_p, entry);
	write_msi_msg(*irq_p, &msg);

	return 0;

out_msi_free:
	free_msi(pbm, msi);

out_irq_free:
	irq_set_chip(*irq_p, NULL);
	irq_free(*irq_p);
	*irq_p = 0;

out_err:
	return err;
}

static void sparc64_teardown_msi_irq(unsigned int irq,
				     struct pci_dev *pdev)
{
	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
	const struct sparc64_msiq_ops *ops = pbm->msi_ops;
	unsigned int msi_num;
	int i, err;

	for (i = 0; i < pbm->msi_num; i++) {
		if (pbm->msi_irq_table[i] == irq)
			break;
	}
	if (i >= pbm->msi_num) {
		printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
		       pbm->name, irq);
		return;
	}

	msi_num = pbm->msi_first + i;
	pbm->msi_irq_table[i] = ~0U;

	err = ops->msi_teardown(pbm, msi_num);
	if (err) {
		printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
		       "irq %u, gives error %d\n",
		       pbm->name, msi_num, irq, err);
		return;
	}

	free_msi(pbm, msi_num);

	irq_set_chip(irq, NULL);
	irq_free(irq);
}

static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
{
	unsigned long size, bits_per_ulong;

	bits_per_ulong = sizeof(unsigned long) * 8;
	size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
	size /= 8;
	BUG_ON(size % sizeof(unsigned long));

	pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
	if (!pbm->msi_bitmap)
		return -ENOMEM;

	return 0;
}

static void msi_bitmap_free(struct pci_pbm_info *pbm)
{
	kfree(pbm->msi_bitmap);
	pbm->msi_bitmap = NULL;
}

static int msi_table_alloc(struct pci_pbm_info *pbm)
{
	int size, i;

	size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
	pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
	if (!pbm->msiq_irq_cookies)
		return -ENOMEM;

	for (i = 0; i < pbm->msiq_num; i++) {
		struct sparc64_msiq_cookie *p;

		p = &pbm->msiq_irq_cookies[i];
		p->pbm = pbm;
		p->msiqid = pbm->msiq_first + i;
	}

	size = pbm->msi_num * sizeof(unsigned int);
	pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
	if (!pbm->msi_irq_table) {
		kfree(pbm->msiq_irq_cookies);
		pbm->msiq_irq_cookies = NULL;
		return -ENOMEM;
	}

	return 0;
}

static void msi_table_free(struct pci_pbm_info *pbm)
{
	kfree(pbm->msiq_irq_cookies);
	pbm->msiq_irq_cookies = NULL;

	kfree(pbm->msi_irq_table);
	pbm->msi_irq_table = NULL;
}

static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
				 const struct sparc64_msiq_ops *ops,
				 unsigned long msiqid,
				 unsigned long devino)
{
	int irq = ops->msiq_build_irq(pbm, msiqid, devino);
	int err, nid;

	if (irq < 0)
		return irq;

	nid = pbm->numa_node;
	if (nid != -1) {
		cpumask_t numa_mask = *cpumask_of_node(nid);

		irq_set_affinity(irq, &numa_mask);
	}
	err = request_irq(irq, sparc64_msiq_interrupt, 0,
			  "MSIQ",
			  &pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
	if (err)
		return err;

	return 0;
}

static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
				      const struct sparc64_msiq_ops *ops)
{
	int i;

	for (i = 0; i < pbm->msiq_num; i++) {
		unsigned long msiqid = i + pbm->msiq_first;
		unsigned long devino = i + pbm->msiq_first_devino;
		int err;

		err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
		if (err)
			return err;
	}

	return 0;
}

void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
			  const struct sparc64_msiq_ops *ops)
{
	const u32 *val;
	int len;

	val = of_get_property(pbm->op->dev.of_node, "#msi-eqs", &len);
	if (!val || len != 4)
		goto no_msi;
	pbm->msiq_num = *val;
	if (pbm->msiq_num) {
		const struct msiq_prop {
			u32 first_msiq;
			u32 num_msiq;
			u32 first_devino;
		} *mqp;
		const struct msi_range_prop {
			u32 first_msi;
			u32 num_msi;
		} *mrng;
		const struct addr_range_prop {
			u32 msi32_high;
			u32 msi32_low;
			u32 msi32_len;
			u32 msi64_high;
			u32 msi64_low;
			u32 msi64_len;
		} *arng;

		val = of_get_property(pbm->op->dev.of_node, "msi-eq-size", &len);
		if (!val || len != 4)
			goto no_msi;

		pbm->msiq_ent_count = *val;

		mqp = of_get_property(pbm->op->dev.of_node,
				      "msi-eq-to-devino", &len);
		if (!mqp)
			mqp = of_get_property(pbm->op->dev.of_node,
					      "msi-eq-devino", &len);
		if (!mqp || len != sizeof(struct msiq_prop))
			goto no_msi;

		pbm->msiq_first = mqp->first_msiq;
		pbm->msiq_first_devino = mqp->first_devino;

		val = of_get_property(pbm->op->dev.of_node, "#msi", &len);
		if (!val || len != 4)
			goto no_msi;
		pbm->msi_num = *val;

		mrng = of_get_property(pbm->op->dev.of_node, "msi-ranges", &len);
		if (!mrng || len != sizeof(struct msi_range_prop))
			goto no_msi;
		pbm->msi_first = mrng->first_msi;

		val = of_get_property(pbm->op->dev.of_node, "msi-data-mask", &len);
		if (!val || len != 4)
			goto no_msi;
		pbm->msi_data_mask = *val;

		val = of_get_property(pbm->op->dev.of_node, "msix-data-width", &len);
		if (!val || len != 4)
			goto no_msi;
		pbm->msix_data_width = *val;

		arng = of_get_property(pbm->op->dev.of_node, "msi-address-ranges",
				       &len);
		if (!arng || len != sizeof(struct addr_range_prop))
			goto no_msi;
		pbm->msi32_start = ((u64)arng->msi32_high << 32) |
			(u64) arng->msi32_low;
		pbm->msi64_start = ((u64)arng->msi64_high << 32) |
			(u64) arng->msi64_low;
		pbm->msi32_len = arng->msi32_len;
		pbm->msi64_len = arng->msi64_len;

		if (msi_bitmap_alloc(pbm))
			goto no_msi;

		if (msi_table_alloc(pbm)) {
			msi_bitmap_free(pbm);
			goto no_msi;
		}

		if (ops->msiq_alloc(pbm)) {
			msi_table_free(pbm);
			msi_bitmap_free(pbm);
			goto no_msi;
		}

		if (sparc64_bringup_msi_queues(pbm, ops)) {
			ops->msiq_free(pbm);
			msi_table_free(pbm);
			msi_bitmap_free(pbm);
			goto no_msi;
		}

		printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
		       "devino[0x%x]\n",
		       pbm->name,
		       pbm->msiq_first, pbm->msiq_num,
		       pbm->msiq_ent_count,
		       pbm->msiq_first_devino);
		printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
		       "width[%u]\n",
		       pbm->name,
		       pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
		       pbm->msix_data_width);
		printk(KERN_INFO "%s: MSI addr32[0x%llx:0x%x] "
		       "addr64[0x%llx:0x%x]\n",
		       pbm->name,
		       pbm->msi32_start, pbm->msi32_len,
		       pbm->msi64_start, pbm->msi64_len);
		printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
		       pbm->name,
		       __pa(pbm->msi_queues));

		pbm->msi_ops = ops;
		pbm->setup_msi_irq = sparc64_setup_msi_irq;
		pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
	}
	return;

no_msi:
	pbm->msiq_num = 0;
	printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
}
OpenPOWER on IntegriCloud