Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 1 | /* |
| 2 | * AMD Secure Processor driver |
| 3 | * |
| 4 | * Copyright (C) 2017 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * Author: Tom Lendacky <thomas.lendacky@amd.com> |
| 7 | * Author: Gary R Hook <gary.hook@amd.com> |
| 8 | * Author: Brijesh Singh <brijesh.singh@amd.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/kthread.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/spinlock_types.h> |
| 22 | #include <linux/types.h> |
| 23 | #include <linux/ccp.h> |
| 24 | |
| 25 | #include "ccp-dev.h" |
| 26 | #include "sp-dev.h" |
| 27 | |
| 28 | MODULE_AUTHOR("Tom Lendacky <thomas.lendacky@amd.com>"); |
| 29 | MODULE_AUTHOR("Gary R Hook <gary.hook@amd.com>"); |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | MODULE_VERSION("1.1.0"); |
| 32 | MODULE_DESCRIPTION("AMD Secure Processor driver"); |
| 33 | |
| 34 | /* List of SPs, SP count, read-write access lock, and access functions |
| 35 | * |
| 36 | * Lock structure: get sp_unit_lock for reading whenever we need to |
| 37 | * examine the SP list. |
| 38 | */ |
| 39 | static DEFINE_RWLOCK(sp_unit_lock); |
| 40 | static LIST_HEAD(sp_units); |
| 41 | |
| 42 | /* Ever-increasing value to produce unique unit numbers */ |
| 43 | static atomic_t sp_ordinal; |
| 44 | |
| 45 | static void sp_add_device(struct sp_device *sp) |
| 46 | { |
| 47 | unsigned long flags; |
| 48 | |
| 49 | write_lock_irqsave(&sp_unit_lock, flags); |
| 50 | |
| 51 | list_add_tail(&sp->entry, &sp_units); |
| 52 | |
| 53 | write_unlock_irqrestore(&sp_unit_lock, flags); |
| 54 | } |
| 55 | |
| 56 | static void sp_del_device(struct sp_device *sp) |
| 57 | { |
| 58 | unsigned long flags; |
| 59 | |
| 60 | write_lock_irqsave(&sp_unit_lock, flags); |
| 61 | |
| 62 | list_del(&sp->entry); |
| 63 | |
| 64 | write_unlock_irqrestore(&sp_unit_lock, flags); |
| 65 | } |
| 66 | |
Brijesh Singh | f4d18d6 | 2017-07-06 09:59:15 -0500 | [diff] [blame] | 67 | static irqreturn_t sp_irq_handler(int irq, void *data) |
| 68 | { |
| 69 | struct sp_device *sp = data; |
| 70 | |
| 71 | if (sp->ccp_irq_handler) |
| 72 | sp->ccp_irq_handler(irq, sp->ccp_irq_data); |
| 73 | |
| 74 | if (sp->psp_irq_handler) |
| 75 | sp->psp_irq_handler(irq, sp->psp_irq_data); |
| 76 | |
| 77 | return IRQ_HANDLED; |
| 78 | } |
| 79 | |
| 80 | int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler, |
| 81 | const char *name, void *data) |
| 82 | { |
| 83 | int ret; |
| 84 | |
| 85 | if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) { |
| 86 | /* Need a common routine to manage all interrupts */ |
| 87 | sp->ccp_irq_data = data; |
| 88 | sp->ccp_irq_handler = handler; |
| 89 | |
| 90 | if (!sp->irq_registered) { |
| 91 | ret = request_irq(sp->ccp_irq, sp_irq_handler, 0, |
| 92 | sp->name, sp); |
| 93 | if (ret) |
| 94 | return ret; |
| 95 | |
| 96 | sp->irq_registered = true; |
| 97 | } |
| 98 | } else { |
| 99 | /* Each sub-device can manage it's own interrupt */ |
| 100 | ret = request_irq(sp->ccp_irq, handler, 0, name, data); |
| 101 | if (ret) |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler, |
| 109 | const char *name, void *data) |
| 110 | { |
| 111 | int ret; |
| 112 | |
| 113 | if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) { |
| 114 | /* Need a common routine to manage all interrupts */ |
| 115 | sp->psp_irq_data = data; |
| 116 | sp->psp_irq_handler = handler; |
| 117 | |
| 118 | if (!sp->irq_registered) { |
| 119 | ret = request_irq(sp->psp_irq, sp_irq_handler, 0, |
| 120 | sp->name, sp); |
| 121 | if (ret) |
| 122 | return ret; |
| 123 | |
| 124 | sp->irq_registered = true; |
| 125 | } |
| 126 | } else { |
| 127 | /* Each sub-device can manage it's own interrupt */ |
| 128 | ret = request_irq(sp->psp_irq, handler, 0, name, data); |
| 129 | if (ret) |
| 130 | return ret; |
| 131 | } |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | void sp_free_ccp_irq(struct sp_device *sp, void *data) |
| 137 | { |
| 138 | if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) { |
| 139 | /* Using common routine to manage all interrupts */ |
| 140 | if (!sp->psp_irq_handler) { |
| 141 | /* Nothing else using it, so free it */ |
| 142 | free_irq(sp->ccp_irq, sp); |
| 143 | |
| 144 | sp->irq_registered = false; |
| 145 | } |
| 146 | |
| 147 | sp->ccp_irq_handler = NULL; |
| 148 | sp->ccp_irq_data = NULL; |
| 149 | } else { |
| 150 | /* Each sub-device can manage it's own interrupt */ |
| 151 | free_irq(sp->ccp_irq, data); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | void sp_free_psp_irq(struct sp_device *sp, void *data) |
| 156 | { |
| 157 | if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) { |
| 158 | /* Using common routine to manage all interrupts */ |
| 159 | if (!sp->ccp_irq_handler) { |
| 160 | /* Nothing else using it, so free it */ |
| 161 | free_irq(sp->psp_irq, sp); |
| 162 | |
| 163 | sp->irq_registered = false; |
| 164 | } |
| 165 | |
| 166 | sp->psp_irq_handler = NULL; |
| 167 | sp->psp_irq_data = NULL; |
| 168 | } else { |
| 169 | /* Each sub-device can manage it's own interrupt */ |
| 170 | free_irq(sp->psp_irq, data); |
| 171 | } |
| 172 | } |
| 173 | |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 174 | /** |
| 175 | * sp_alloc_struct - allocate and initialize the sp_device struct |
| 176 | * |
| 177 | * @dev: device struct of the SP |
| 178 | */ |
| 179 | struct sp_device *sp_alloc_struct(struct device *dev) |
| 180 | { |
| 181 | struct sp_device *sp; |
| 182 | |
| 183 | sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL); |
| 184 | if (!sp) |
| 185 | return NULL; |
| 186 | |
| 187 | sp->dev = dev; |
| 188 | sp->ord = atomic_inc_return(&sp_ordinal); |
| 189 | snprintf(sp->name, SP_MAX_NAME_LEN, "sp-%u", sp->ord); |
| 190 | |
| 191 | return sp; |
| 192 | } |
| 193 | |
| 194 | int sp_init(struct sp_device *sp) |
| 195 | { |
| 196 | sp_add_device(sp); |
| 197 | |
| 198 | if (sp->dev_vdata->ccp_vdata) |
| 199 | ccp_dev_init(sp); |
| 200 | |
Brijesh Singh | 2a6170d | 2017-12-04 10:57:28 -0600 | [diff] [blame] | 201 | if (sp->dev_vdata->psp_vdata) |
| 202 | psp_dev_init(sp); |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | void sp_destroy(struct sp_device *sp) |
| 207 | { |
| 208 | if (sp->dev_vdata->ccp_vdata) |
| 209 | ccp_dev_destroy(sp); |
| 210 | |
Brijesh Singh | 2a6170d | 2017-12-04 10:57:28 -0600 | [diff] [blame] | 211 | if (sp->dev_vdata->psp_vdata) |
| 212 | psp_dev_destroy(sp); |
| 213 | |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 214 | sp_del_device(sp); |
| 215 | } |
| 216 | |
| 217 | #ifdef CONFIG_PM |
| 218 | int sp_suspend(struct sp_device *sp, pm_message_t state) |
| 219 | { |
| 220 | int ret; |
| 221 | |
| 222 | if (sp->dev_vdata->ccp_vdata) { |
| 223 | ret = ccp_dev_suspend(sp, state); |
| 224 | if (ret) |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | int sp_resume(struct sp_device *sp) |
| 232 | { |
| 233 | int ret; |
| 234 | |
| 235 | if (sp->dev_vdata->ccp_vdata) { |
| 236 | ret = ccp_dev_resume(sp); |
| 237 | if (ret) |
| 238 | return ret; |
| 239 | } |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | #endif |
| 244 | |
Brijesh Singh | 2a6170d | 2017-12-04 10:57:28 -0600 | [diff] [blame] | 245 | struct sp_device *sp_get_psp_master_device(void) |
| 246 | { |
| 247 | struct sp_device *i, *ret = NULL; |
| 248 | unsigned long flags; |
| 249 | |
| 250 | write_lock_irqsave(&sp_unit_lock, flags); |
| 251 | if (list_empty(&sp_units)) |
| 252 | goto unlock; |
| 253 | |
| 254 | list_for_each_entry(i, &sp_units, entry) { |
| 255 | if (i->psp_data) |
| 256 | break; |
| 257 | } |
| 258 | |
| 259 | if (i->get_psp_master_device) |
| 260 | ret = i->get_psp_master_device(); |
| 261 | unlock: |
| 262 | write_unlock_irqrestore(&sp_unit_lock, flags); |
| 263 | return ret; |
| 264 | } |
| 265 | |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 266 | static int __init sp_mod_init(void) |
| 267 | { |
| 268 | #ifdef CONFIG_X86 |
| 269 | int ret; |
| 270 | |
Brijesh Singh | d0ebbc0 | 2017-07-06 09:59:16 -0500 | [diff] [blame] | 271 | ret = sp_pci_init(); |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 272 | if (ret) |
| 273 | return ret; |
| 274 | |
Brijesh Singh | 200664d | 2017-12-04 10:57:28 -0600 | [diff] [blame^] | 275 | #ifdef CONFIG_CRYPTO_DEV_SP_PSP |
| 276 | psp_pci_init(); |
| 277 | #endif |
| 278 | |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 279 | return 0; |
| 280 | #endif |
| 281 | |
| 282 | #ifdef CONFIG_ARM64 |
| 283 | int ret; |
| 284 | |
Brijesh Singh | d0ebbc0 | 2017-07-06 09:59:16 -0500 | [diff] [blame] | 285 | ret = sp_platform_init(); |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 286 | if (ret) |
| 287 | return ret; |
| 288 | |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 289 | return 0; |
| 290 | #endif |
| 291 | |
| 292 | return -ENODEV; |
| 293 | } |
| 294 | |
| 295 | static void __exit sp_mod_exit(void) |
| 296 | { |
| 297 | #ifdef CONFIG_X86 |
Brijesh Singh | 200664d | 2017-12-04 10:57:28 -0600 | [diff] [blame^] | 298 | |
| 299 | #ifdef CONFIG_CRYPTO_DEV_SP_PSP |
| 300 | psp_pci_exit(); |
| 301 | #endif |
| 302 | |
Brijesh Singh | d0ebbc0 | 2017-07-06 09:59:16 -0500 | [diff] [blame] | 303 | sp_pci_exit(); |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 304 | #endif |
| 305 | |
| 306 | #ifdef CONFIG_ARM64 |
Brijesh Singh | d0ebbc0 | 2017-07-06 09:59:16 -0500 | [diff] [blame] | 307 | sp_platform_exit(); |
Brijesh Singh | 720419f | 2017-07-06 09:59:14 -0500 | [diff] [blame] | 308 | #endif |
| 309 | } |
| 310 | |
| 311 | module_init(sp_mod_init); |
| 312 | module_exit(sp_mod_exit); |