1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AMD Secure Processor device driver 4 * 5 * Copyright (C) 2013,2018 Advanced Micro Devices, Inc. 6 * 7 * Author: Tom Lendacky <thomas.lendacky@amd.com> 8 * Author: Gary R Hook <gary.hook@amd.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/device.h> 14 #include <linux/pci.h> 15 #include <linux/pci_ids.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/kthread.h> 18 #include <linux/sched.h> 19 #include <linux/interrupt.h> 20 #include <linux/spinlock.h> 21 #include <linux/delay.h> 22 #include <linux/ccp.h> 23 24 #include "ccp-dev.h" 25 #include "psp-dev.h" 26 27 #define MSIX_VECTORS 2 28 29 struct sp_pci { 30 int msix_count; 31 struct msix_entry msix_entry[MSIX_VECTORS]; 32 }; 33 static struct sp_device *sp_dev_master; 34 35 static int sp_get_msix_irqs(struct sp_device *sp) 36 { 37 struct sp_pci *sp_pci = sp->dev_specific; 38 struct device *dev = sp->dev; 39 struct pci_dev *pdev = to_pci_dev(dev); 40 int v, ret; 41 42 for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++) 43 sp_pci->msix_entry[v].entry = v; 44 45 ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v); 46 if (ret < 0) 47 return ret; 48 49 sp_pci->msix_count = ret; 50 sp->use_tasklet = true; 51 52 sp->psp_irq = sp_pci->msix_entry[0].vector; 53 sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector 54 : sp_pci->msix_entry[0].vector; 55 return 0; 56 } 57 58 static int sp_get_msi_irq(struct sp_device *sp) 59 { 60 struct device *dev = sp->dev; 61 struct pci_dev *pdev = to_pci_dev(dev); 62 int ret; 63 64 ret = pci_enable_msi(pdev); 65 if (ret) 66 return ret; 67 68 sp->ccp_irq = pdev->irq; 69 sp->psp_irq = pdev->irq; 70 71 return 0; 72 } 73 74 static int sp_get_irqs(struct sp_device *sp) 75 { 76 struct device *dev = sp->dev; 77 int ret; 78 79 ret = sp_get_msix_irqs(sp); 80 if (!ret) 81 return 0; 82 83 /* Couldn't get MSI-X vectors, try MSI */ 84 dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret); 85 ret = sp_get_msi_irq(sp); 86 if (!ret) 87 return 0; 88 89 /* Couldn't get MSI interrupt */ 90 dev_notice(dev, "could not enable MSI (%d)\n", ret); 91 92 return ret; 93 } 94 95 static void sp_free_irqs(struct sp_device *sp) 96 { 97 struct sp_pci *sp_pci = sp->dev_specific; 98 struct device *dev = sp->dev; 99 struct pci_dev *pdev = to_pci_dev(dev); 100 101 if (sp_pci->msix_count) 102 pci_disable_msix(pdev); 103 else if (sp->psp_irq) 104 pci_disable_msi(pdev); 105 106 sp->ccp_irq = 0; 107 sp->psp_irq = 0; 108 } 109 110 static bool sp_pci_is_master(struct sp_device *sp) 111 { 112 struct device *dev_cur, *dev_new; 113 struct pci_dev *pdev_cur, *pdev_new; 114 115 dev_new = sp->dev; 116 dev_cur = sp_dev_master->dev; 117 118 pdev_new = to_pci_dev(dev_new); 119 pdev_cur = to_pci_dev(dev_cur); 120 121 if (pdev_new->bus->number < pdev_cur->bus->number) 122 return true; 123 124 if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn)) 125 return true; 126 127 if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn)) 128 return true; 129 130 return false; 131 } 132 133 static void psp_set_master(struct sp_device *sp) 134 { 135 if (!sp_dev_master) { 136 sp_dev_master = sp; 137 return; 138 } 139 140 if (sp_pci_is_master(sp)) 141 sp_dev_master = sp; 142 } 143 144 static struct sp_device *psp_get_master(void) 145 { 146 return sp_dev_master; 147 } 148 149 static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 150 { 151 struct sp_device *sp; 152 struct sp_pci *sp_pci; 153 struct device *dev = &pdev->dev; 154 void __iomem * const *iomap_table; 155 int bar_mask; 156 int ret; 157 158 ret = -ENOMEM; 159 sp = sp_alloc_struct(dev); 160 if (!sp) 161 goto e_err; 162 163 sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL); 164 if (!sp_pci) 165 goto e_err; 166 167 sp->dev_specific = sp_pci; 168 sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data; 169 if (!sp->dev_vdata) { 170 ret = -ENODEV; 171 dev_err(dev, "missing driver data\n"); 172 goto e_err; 173 } 174 175 ret = pcim_enable_device(pdev); 176 if (ret) { 177 dev_err(dev, "pcim_enable_device failed (%d)\n", ret); 178 goto e_err; 179 } 180 181 bar_mask = pci_select_bars(pdev, IORESOURCE_MEM); 182 ret = pcim_iomap_regions(pdev, bar_mask, "ccp"); 183 if (ret) { 184 dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret); 185 goto e_err; 186 } 187 188 iomap_table = pcim_iomap_table(pdev); 189 if (!iomap_table) { 190 dev_err(dev, "pcim_iomap_table failed\n"); 191 ret = -ENOMEM; 192 goto e_err; 193 } 194 195 sp->io_map = iomap_table[sp->dev_vdata->bar]; 196 if (!sp->io_map) { 197 dev_err(dev, "ioremap failed\n"); 198 ret = -ENOMEM; 199 goto e_err; 200 } 201 202 ret = sp_get_irqs(sp); 203 if (ret) 204 goto e_err; 205 206 pci_set_master(pdev); 207 sp->set_psp_master_device = psp_set_master; 208 sp->get_psp_master_device = psp_get_master; 209 210 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); 211 if (ret) { 212 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 213 if (ret) { 214 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", 215 ret); 216 goto e_err; 217 } 218 } 219 220 dev_set_drvdata(dev, sp); 221 222 ret = sp_init(sp); 223 if (ret) 224 goto e_err; 225 226 return 0; 227 228 e_err: 229 dev_notice(dev, "initialization failed\n"); 230 return ret; 231 } 232 233 static void sp_pci_remove(struct pci_dev *pdev) 234 { 235 struct device *dev = &pdev->dev; 236 struct sp_device *sp = dev_get_drvdata(dev); 237 238 if (!sp) 239 return; 240 241 sp_destroy(sp); 242 243 sp_free_irqs(sp); 244 } 245 246 #ifdef CONFIG_PM 247 static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state) 248 { 249 struct device *dev = &pdev->dev; 250 struct sp_device *sp = dev_get_drvdata(dev); 251 252 return sp_suspend(sp, state); 253 } 254 255 static int sp_pci_resume(struct pci_dev *pdev) 256 { 257 struct device *dev = &pdev->dev; 258 struct sp_device *sp = dev_get_drvdata(dev); 259 260 return sp_resume(sp); 261 } 262 #endif 263 264 #ifdef CONFIG_CRYPTO_DEV_SP_PSP 265 static const struct psp_vdata pspv1 = { 266 .cmdresp_reg = 0x10580, 267 .cmdbuff_addr_lo_reg = 0x105e0, 268 .cmdbuff_addr_hi_reg = 0x105e4, 269 .feature_reg = 0x105fc, 270 .inten_reg = 0x10610, 271 .intsts_reg = 0x10614, 272 }; 273 274 static const struct psp_vdata pspv2 = { 275 .cmdresp_reg = 0x10980, 276 .cmdbuff_addr_lo_reg = 0x109e0, 277 .cmdbuff_addr_hi_reg = 0x109e4, 278 .feature_reg = 0x109fc, 279 .inten_reg = 0x10690, 280 .intsts_reg = 0x10694, 281 }; 282 #endif 283 284 static const struct sp_dev_vdata dev_vdata[] = { 285 { /* 0 */ 286 .bar = 2, 287 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 288 .ccp_vdata = &ccpv3, 289 #endif 290 }, 291 { /* 1 */ 292 .bar = 2, 293 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 294 .ccp_vdata = &ccpv5a, 295 #endif 296 #ifdef CONFIG_CRYPTO_DEV_SP_PSP 297 .psp_vdata = &pspv1, 298 #endif 299 }, 300 { /* 2 */ 301 .bar = 2, 302 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 303 .ccp_vdata = &ccpv5b, 304 #endif 305 }, 306 { /* 3 */ 307 .bar = 2, 308 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 309 .ccp_vdata = &ccpv5a, 310 #endif 311 #ifdef CONFIG_CRYPTO_DEV_SP_PSP 312 .psp_vdata = &pspv2, 313 #endif 314 }, 315 }; 316 static const struct pci_device_id sp_pci_table[] = { 317 { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] }, 318 { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] }, 319 { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] }, 320 { PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] }, 321 /* Last entry must be zero */ 322 { 0, } 323 }; 324 MODULE_DEVICE_TABLE(pci, sp_pci_table); 325 326 static struct pci_driver sp_pci_driver = { 327 .name = "ccp", 328 .id_table = sp_pci_table, 329 .probe = sp_pci_probe, 330 .remove = sp_pci_remove, 331 #ifdef CONFIG_PM 332 .suspend = sp_pci_suspend, 333 .resume = sp_pci_resume, 334 #endif 335 }; 336 337 int sp_pci_init(void) 338 { 339 return pci_register_driver(&sp_pci_driver); 340 } 341 342 void sp_pci_exit(void) 343 { 344 pci_unregister_driver(&sp_pci_driver); 345 } 346