1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * AMD Secure Processor driver
  4 *
  5 * Copyright (C) 2017-2018 Advanced Micro Devices, Inc.
  6 *
  7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
  8 * Author: Gary R Hook <gary.hook@amd.com>
  9 * Author: Brijesh Singh <brijesh.singh@amd.com>
 10 */
 11
 12#include <linux/module.h>
 13#include <linux/kernel.h>
 14#include <linux/kthread.h>
 15#include <linux/sched.h>
 16#include <linux/interrupt.h>
 17#include <linux/spinlock.h>
 18#include <linux/spinlock_types.h>
 19#include <linux/types.h>
 20#include <linux/ccp.h>
 21
 22#include "ccp-dev.h"
 23#include "sp-dev.h"
 24
 25MODULE_AUTHOR("Tom Lendacky <thomas.lendacky@amd.com>");
 26MODULE_AUTHOR("Gary R Hook <gary.hook@amd.com>");
 27MODULE_LICENSE("GPL");
 28MODULE_VERSION("1.1.0");
 29MODULE_DESCRIPTION("AMD Secure Processor driver");
 30
 31/* List of SPs, SP count, read-write access lock, and access functions
 32 *
 33 * Lock structure: get sp_unit_lock for reading whenever we need to
 34 * examine the SP list.
 35 */
 36static DEFINE_RWLOCK(sp_unit_lock);
 37static LIST_HEAD(sp_units);
 38
 39/* Ever-increasing value to produce unique unit numbers */
 40static atomic_t sp_ordinal;
 41
 42static void sp_add_device(struct sp_device *sp)
 43{
 44	unsigned long flags;
 45
 46	write_lock_irqsave(&sp_unit_lock, flags);
 47
 48	list_add_tail(&sp->entry, &sp_units);
 49
 50	write_unlock_irqrestore(&sp_unit_lock, flags);
 51}
 52
 53static void sp_del_device(struct sp_device *sp)
 54{
 55	unsigned long flags;
 56
 57	write_lock_irqsave(&sp_unit_lock, flags);
 58
 59	list_del(&sp->entry);
 60
 61	write_unlock_irqrestore(&sp_unit_lock, flags);
 62}
 63
 64static irqreturn_t sp_irq_handler(int irq, void *data)
 65{
 66	struct sp_device *sp = data;
 67
 68	if (sp->ccp_irq_handler)
 69		sp->ccp_irq_handler(irq, sp->ccp_irq_data);
 70
 71	if (sp->psp_irq_handler)
 72		sp->psp_irq_handler(irq, sp->psp_irq_data);
 73
 74	return IRQ_HANDLED;
 75}
 76
 77int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler,
 78		       const char *name, void *data)
 79{
 80	int ret;
 81
 82	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) {
 83		/* Need a common routine to manage all interrupts */
 84		sp->ccp_irq_data = data;
 85		sp->ccp_irq_handler = handler;
 86
 87		if (!sp->irq_registered) {
 88			ret = request_irq(sp->ccp_irq, sp_irq_handler, 0,
 89					  sp->name, sp);
 90			if (ret)
 91				return ret;
 92
 93			sp->irq_registered = true;
 94		}
 95	} else {
 96		/* Each sub-device can manage it's own interrupt */
 97		ret = request_irq(sp->ccp_irq, handler, 0, name, data);
 98		if (ret)
 99			return ret;
100	}
101
102	return 0;
103}
104
105int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler,
106		       const char *name, void *data)
107{
108	int ret;
109
110	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) {
111		/* Need a common routine to manage all interrupts */
112		sp->psp_irq_data = data;
113		sp->psp_irq_handler = handler;
114
115		if (!sp->irq_registered) {
116			ret = request_irq(sp->psp_irq, sp_irq_handler, 0,
117					  sp->name, sp);
118			if (ret)
119				return ret;
120
121			sp->irq_registered = true;
122		}
123	} else {
124		/* Each sub-device can manage it's own interrupt */
125		ret = request_irq(sp->psp_irq, handler, 0, name, data);
126		if (ret)
127			return ret;
128	}
129
130	return 0;
131}
132
133void sp_free_ccp_irq(struct sp_device *sp, void *data)
134{
135	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) {
136		/* Using common routine to manage all interrupts */
137		if (!sp->psp_irq_handler) {
138			/* Nothing else using it, so free it */
139			free_irq(sp->ccp_irq, sp);
140
141			sp->irq_registered = false;
142		}
143
144		sp->ccp_irq_handler = NULL;
145		sp->ccp_irq_data = NULL;
146	} else {
147		/* Each sub-device can manage it's own interrupt */
148		free_irq(sp->ccp_irq, data);
149	}
150}
151
152void sp_free_psp_irq(struct sp_device *sp, void *data)
153{
154	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) {
155		/* Using common routine to manage all interrupts */
156		if (!sp->ccp_irq_handler) {
157			/* Nothing else using it, so free it */
158			free_irq(sp->psp_irq, sp);
159
160			sp->irq_registered = false;
161		}
162
163		sp->psp_irq_handler = NULL;
164		sp->psp_irq_data = NULL;
165	} else {
166		/* Each sub-device can manage it's own interrupt */
167		free_irq(sp->psp_irq, data);
168	}
169}
170
171/**
172 * sp_alloc_struct - allocate and initialize the sp_device struct
173 *
174 * @dev: device struct of the SP
175 */
176struct sp_device *sp_alloc_struct(struct device *dev)
177{
178	struct sp_device *sp;
179
180	sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL);
181	if (!sp)
182		return NULL;
183
184	sp->dev = dev;
185	sp->ord = atomic_inc_return(&sp_ordinal);
186	snprintf(sp->name, SP_MAX_NAME_LEN, "sp-%u", sp->ord);
187
188	return sp;
189}
190
191int sp_init(struct sp_device *sp)
192{
193	sp_add_device(sp);
194
195	if (sp->dev_vdata->ccp_vdata)
196		ccp_dev_init(sp);
197
198	if (sp->dev_vdata->psp_vdata)
199		psp_dev_init(sp);
200	return 0;
201}
202
203void sp_destroy(struct sp_device *sp)
204{
205	if (sp->dev_vdata->ccp_vdata)
206		ccp_dev_destroy(sp);
207
208	if (sp->dev_vdata->psp_vdata)
209		psp_dev_destroy(sp);
210
211	sp_del_device(sp);
212}
213
214int sp_suspend(struct sp_device *sp)
215{
216	int ret;
217
218	if (sp->dev_vdata->ccp_vdata) {
219		ret = ccp_dev_suspend(sp);
220		if (ret)
221			return ret;
222	}
223
224	return 0;
225}
226
227int sp_resume(struct sp_device *sp)
228{
229	int ret;
230
231	if (sp->dev_vdata->ccp_vdata) {
232		ret = ccp_dev_resume(sp);
233		if (ret)
234			return ret;
235	}
236
237	return 0;
238}
239
240struct sp_device *sp_get_psp_master_device(void)
241{
242	struct sp_device *i, *ret = NULL;
243	unsigned long flags;
244
245	write_lock_irqsave(&sp_unit_lock, flags);
246	if (list_empty(&sp_units))
247		goto unlock;
248
249	list_for_each_entry(i, &sp_units, entry) {
250		if (i->psp_data && i->get_psp_master_device) {
251			ret = i->get_psp_master_device();
252			break;
253		}
254	}
255
256unlock:
257	write_unlock_irqrestore(&sp_unit_lock, flags);
258	return ret;
259}
260
261static int __init sp_mod_init(void)
262{
263#ifdef CONFIG_X86
264	int ret;
265
266	ret = sp_pci_init();
267	if (ret)
268		return ret;
269
270#ifdef CONFIG_CRYPTO_DEV_SP_PSP
271	psp_pci_init();
272#endif
273
274	return 0;
275#endif
276
277#ifdef CONFIG_ARM64
278	int ret;
279
280	ret = sp_platform_init();
281	if (ret)
282		return ret;
283
284	return 0;
285#endif
286
287	return -ENODEV;
288}
289
290static void __exit sp_mod_exit(void)
291{
292#ifdef CONFIG_X86
293
294#ifdef CONFIG_CRYPTO_DEV_SP_PSP
295	psp_pci_exit();
296#endif
297
298	sp_pci_exit();
299#endif
300
301#ifdef CONFIG_ARM64
302	sp_platform_exit();
303#endif
304}
305
306module_init(sp_mod_init);
307module_exit(sp_mod_exit);