summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/ccp/ccp-pci.c
blob: 6ade02f04f91cc7fdaafcdfa2c0b8bbe97e198f3 (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
/*
 * AMD Cryptographic Coprocessor (CCP) driver
 *
 * Copyright (C) 2013 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/dma-mapping.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/ccp.h>

#include "ccp-dev.h"

#define IO_BAR				2
#define IO_OFFSET			0x20000

#define MSIX_VECTORS			2

struct ccp_msix {
	u32 vector;
	char name[16];
};

struct ccp_pci {
	int msix_count;
	struct ccp_msix msix[MSIX_VECTORS];
};

static int ccp_get_msix_irqs(struct ccp_device *ccp)
{
	struct ccp_pci *ccp_pci = ccp->dev_specific;
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct msix_entry msix_entry[MSIX_VECTORS];
	unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
	int v, ret;

	for (v = 0; v < ARRAY_SIZE(msix_entry); v++)
		msix_entry[v].entry = v;

	ret = pci_enable_msix_range(pdev, msix_entry, 1, v);
	if (ret < 0)
		return ret;

	ccp_pci->msix_count = ret;
	for (v = 0; v < ccp_pci->msix_count; v++) {
		/* Set the interrupt names and request the irqs */
		snprintf(ccp_pci->msix[v].name, name_len, "ccp-%u", v);
		ccp_pci->msix[v].vector = msix_entry[v].vector;
		ret = request_irq(ccp_pci->msix[v].vector, ccp_irq_handler,
				  0, ccp_pci->msix[v].name, dev);
		if (ret) {
			dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
				   ret);
			goto e_irq;
		}
	}

	return 0;

e_irq:
	while (v--)
		free_irq(ccp_pci->msix[v].vector, dev);

	pci_disable_msix(pdev);

	ccp_pci->msix_count = 0;

	return ret;
}

static int ccp_get_msi_irq(struct ccp_device *ccp)
{
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	int ret;

	ret = pci_enable_msi(pdev);
	if (ret)
		return ret;

	ccp->irq = pdev->irq;
	ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
	if (ret) {
		dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
		goto e_msi;
	}

	return 0;

e_msi:
	pci_disable_msi(pdev);

	return ret;
}

static int ccp_get_irqs(struct ccp_device *ccp)
{
	struct device *dev = ccp->dev;
	int ret;

	ret = ccp_get_msix_irqs(ccp);
	if (!ret)
		return 0;

	/* Couldn't get MSI-X vectors, try MSI */
	dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
	ret = ccp_get_msi_irq(ccp);
	if (!ret)
		return 0;

	/* Couldn't get MSI interrupt */
	dev_notice(dev, "could not enable MSI (%d)\n", ret);

	return ret;
}

static void ccp_free_irqs(struct ccp_device *ccp)
{
	struct ccp_pci *ccp_pci = ccp->dev_specific;
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);

	if (ccp_pci->msix_count) {
		while (ccp_pci->msix_count--)
			free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
				 dev);
		pci_disable_msix(pdev);
	} else {
		free_irq(ccp->irq, dev);
		pci_disable_msi(pdev);
	}
}

static int ccp_find_mmio_area(struct ccp_device *ccp)
{
	struct device *dev = ccp->dev;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	resource_size_t io_len;
	unsigned long io_flags;

	io_flags = pci_resource_flags(pdev, IO_BAR);
	io_len = pci_resource_len(pdev, IO_BAR);
	if ((io_flags & IORESOURCE_MEM) && (io_len >= (IO_OFFSET + 0x800)))
		return IO_BAR;

	return -EIO;
}

static int ccp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct ccp_device *ccp;
	struct ccp_pci *ccp_pci;
	struct device *dev = &pdev->dev;
	unsigned int bar;
	int ret;

	ret = -ENOMEM;
	ccp = ccp_alloc_struct(dev);
	if (!ccp)
		goto e_err;

	ccp_pci = devm_kzalloc(dev, sizeof(*ccp_pci), GFP_KERNEL);
	if (!ccp_pci)
		goto e_err;

	ccp->dev_specific = ccp_pci;
	ccp->get_irq = ccp_get_irqs;
	ccp->free_irq = ccp_free_irqs;

	ret = pci_request_regions(pdev, "ccp");
	if (ret) {
		dev_err(dev, "pci_request_regions failed (%d)\n", ret);
		goto e_err;
	}

	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(dev, "pci_enable_device failed (%d)\n", ret);
		goto e_regions;
	}

	pci_set_master(pdev);

	ret = ccp_find_mmio_area(ccp);
	if (ret < 0)
		goto e_device;
	bar = ret;

	ret = -EIO;
	ccp->io_map = pci_iomap(pdev, bar, 0);
	if (!ccp->io_map) {
		dev_err(dev, "pci_iomap failed\n");
		goto e_device;
	}
	ccp->io_regs = ccp->io_map + IO_OFFSET;

	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
	if (ret) {
		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
		if (ret) {
			dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
				ret);
			goto e_iomap;
		}
	}

	dev_set_drvdata(dev, ccp);

	ret = ccp_init(ccp);
	if (ret)
		goto e_iomap;

	dev_notice(dev, "enabled\n");

	return 0;

e_iomap:
	pci_iounmap(pdev, ccp->io_map);

e_device:
	pci_disable_device(pdev);

e_regions:
	pci_release_regions(pdev);

e_err:
	dev_notice(dev, "initialization failed\n");
	return ret;
}

static void ccp_pci_remove(struct pci_dev *pdev)
{
	struct device *dev = &pdev->dev;
	struct ccp_device *ccp = dev_get_drvdata(dev);

	if (!ccp)
		return;

	ccp_destroy(ccp);

	pci_iounmap(pdev, ccp->io_map);

	pci_disable_device(pdev);

	pci_release_regions(pdev);

	dev_notice(dev, "disabled\n");
}

#ifdef CONFIG_PM
static int ccp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct device *dev = &pdev->dev;
	struct ccp_device *ccp = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&ccp->cmd_lock, flags);

	ccp->suspending = 1;

	/* Wake all the queue kthreads to prepare for suspend */
	for (i = 0; i < ccp->cmd_q_count; i++)
		wake_up_process(ccp->cmd_q[i].kthread);

	spin_unlock_irqrestore(&ccp->cmd_lock, flags);

	/* Wait for all queue kthreads to say they're done */
	while (!ccp_queues_suspended(ccp))
		wait_event_interruptible(ccp->suspend_queue,
					 ccp_queues_suspended(ccp));

	return 0;
}

static int ccp_pci_resume(struct pci_dev *pdev)
{
	struct device *dev = &pdev->dev;
	struct ccp_device *ccp = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&ccp->cmd_lock, flags);

	ccp->suspending = 0;

	/* Wake up all the kthreads */
	for (i = 0; i < ccp->cmd_q_count; i++) {
		ccp->cmd_q[i].suspended = 0;
		wake_up_process(ccp->cmd_q[i].kthread);
	}

	spin_unlock_irqrestore(&ccp->cmd_lock, flags);

	return 0;
}
#endif

static const struct pci_device_id ccp_pci_table[] = {
	{ PCI_VDEVICE(AMD, 0x1537), },
	/* Last entry must be zero */
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, ccp_pci_table);

static struct pci_driver ccp_pci_driver = {
	.name = "ccp",
	.id_table = ccp_pci_table,
	.probe = ccp_pci_probe,
	.remove = ccp_pci_remove,
#ifdef CONFIG_PM
	.suspend = ccp_pci_suspend,
	.resume = ccp_pci_resume,
#endif
};

int ccp_pci_init(void)
{
	return pci_register_driver(&ccp_pci_driver);
}

void ccp_pci_exit(void)
{
	pci_unregister_driver(&ccp_pci_driver);
}
OpenPOWER on IntegriCloud