summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/ccp/sp-pci.c
blob: f5f43c50698ac4e2fa3cea375d73bc000290f27d (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
/*
 * AMD Secure Processor device driver
 *
 * Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 * Author: Gary R Hook <gary.hook@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"
#include "psp-dev.h"

#define MSIX_VECTORS			2

struct sp_pci {
	int msix_count;
	struct msix_entry msix_entry[MSIX_VECTORS];
};
static struct sp_device *sp_dev_master;

static int sp_get_msix_irqs(struct sp_device *sp)
{
	struct sp_pci *sp_pci = sp->dev_specific;
	struct device *dev = sp->dev;
	struct pci_dev *pdev = to_pci_dev(dev);
	int v, ret;

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

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

	sp_pci->msix_count = ret;
	sp->use_tasklet = true;

	sp->psp_irq = sp_pci->msix_entry[0].vector;
	sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
					       : sp_pci->msix_entry[0].vector;
	return 0;
}

static int sp_get_msi_irq(struct sp_device *sp)
{
	struct device *dev = sp->dev;
	struct pci_dev *pdev = to_pci_dev(dev);
	int ret;

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

	sp->ccp_irq = pdev->irq;
	sp->psp_irq = pdev->irq;

	return 0;
}

static int sp_get_irqs(struct sp_device *sp)
{
	struct device *dev = sp->dev;
	int ret;

	ret = sp_get_msix_irqs(sp);
	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 = sp_get_msi_irq(sp);
	if (!ret)
		return 0;

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

	return ret;
}

static void sp_free_irqs(struct sp_device *sp)
{
	struct sp_pci *sp_pci = sp->dev_specific;
	struct device *dev = sp->dev;
	struct pci_dev *pdev = to_pci_dev(dev);

	if (sp_pci->msix_count)
		pci_disable_msix(pdev);
	else if (sp->psp_irq)
		pci_disable_msi(pdev);

	sp->ccp_irq = 0;
	sp->psp_irq = 0;
}

static bool sp_pci_is_master(struct sp_device *sp)
{
	struct device *dev_cur, *dev_new;
	struct pci_dev *pdev_cur, *pdev_new;

	dev_new = sp->dev;
	dev_cur = sp_dev_master->dev;

	pdev_new = to_pci_dev(dev_new);
	pdev_cur = to_pci_dev(dev_cur);

	if (pdev_new->bus->number < pdev_cur->bus->number)
		return true;

	if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
		return true;

	if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
		return true;

	return false;
}

static void psp_set_master(struct sp_device *sp)
{
	if (!sp_dev_master) {
		sp_dev_master = sp;
		return;
	}

	if (sp_pci_is_master(sp))
		sp_dev_master = sp;
}

static struct sp_device *psp_get_master(void)
{
	return sp_dev_master;
}

static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct sp_device *sp;
	struct sp_pci *sp_pci;
	struct device *dev = &pdev->dev;
	void __iomem * const *iomap_table;
	int bar_mask;
	int ret;

	ret = -ENOMEM;
	sp = sp_alloc_struct(dev);
	if (!sp)
		goto e_err;

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

	sp->dev_specific = sp_pci;
	sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
	if (!sp->dev_vdata) {
		ret = -ENODEV;
		dev_err(dev, "missing driver data\n");
		goto e_err;
	}

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

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

	iomap_table = pcim_iomap_table(pdev);
	if (!iomap_table) {
		dev_err(dev, "pcim_iomap_table failed\n");
		ret = -ENOMEM;
		goto e_err;
	}

	sp->io_map = iomap_table[sp->dev_vdata->bar];
	if (!sp->io_map) {
		dev_err(dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto e_err;
	}

	ret = sp_get_irqs(sp);
	if (ret)
		goto e_err;

	pci_set_master(pdev);
	sp->set_psp_master_device = psp_set_master;
	sp->get_psp_master_device = psp_get_master;

	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_err;
		}
	}

	dev_set_drvdata(dev, sp);

	ret = sp_init(sp);
	if (ret)
		goto e_err;

	dev_notice(dev, "enabled\n");

	return 0;

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

static void sp_pci_remove(struct pci_dev *pdev)
{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	if (!sp)
		return;

	sp_destroy(sp);

	sp_free_irqs(sp);

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

#ifdef CONFIG_PM
static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	return sp_suspend(sp, state);
}

static int sp_pci_resume(struct pci_dev *pdev)
{
	struct device *dev = &pdev->dev;
	struct sp_device *sp = dev_get_drvdata(dev);

	return sp_resume(sp);
}
#endif

#ifdef CONFIG_CRYPTO_DEV_SP_PSP
static const struct psp_vdata psp_entry = {
	.offset = 0x10500,
};
#endif

static const struct sp_dev_vdata dev_vdata[] = {
	{
		.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
		.ccp_vdata = &ccpv3,
#endif
	},
	{
		.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
		.ccp_vdata = &ccpv5a,
#endif
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
		.psp_vdata = &psp_entry
#endif
	},
	{
		.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
		.ccp_vdata = &ccpv5b,
#endif
	},
};
static const struct pci_device_id sp_pci_table[] = {
	{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
	{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
	{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
	/* Last entry must be zero */
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, sp_pci_table);

static struct pci_driver sp_pci_driver = {
	.name = "ccp",
	.id_table = sp_pci_table,
	.probe = sp_pci_probe,
	.remove = sp_pci_remove,
#ifdef CONFIG_PM
	.suspend = sp_pci_suspend,
	.resume = sp_pci_resume,
#endif
};

int sp_pci_init(void)
{
	return pci_register_driver(&sp_pci_driver);
}

void sp_pci_exit(void)
{
	pci_unregister_driver(&sp_pci_driver);
}