1 /* 2 * AMD Secure Processor device driver 3 * 4 * Copyright (C) 2013,2016 Advanced Micro Devices, Inc. 5 * 6 * Author: Tom Lendacky <thomas.lendacky@amd.com> 7 * Author: Gary R Hook <gary.hook@amd.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/device.h> 17 #include <linux/pci.h> 18 #include <linux/pci_ids.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/kthread.h> 21 #include <linux/sched.h> 22 #include <linux/interrupt.h> 23 #include <linux/spinlock.h> 24 #include <linux/delay.h> 25 #include <linux/ccp.h> 26 27 #include "ccp-dev.h" 28 #include "psp-dev.h" 29 30 #define MSIX_VECTORS 2 31 32 struct sp_pci { 33 int msix_count; 34 struct msix_entry msix_entry[MSIX_VECTORS]; 35 }; 36 static struct sp_device *sp_dev_master; 37 38 static int sp_get_msix_irqs(struct sp_device *sp) 39 { 40 struct sp_pci *sp_pci = sp->dev_specific; 41 struct device *dev = sp->dev; 42 struct pci_dev *pdev = to_pci_dev(dev); 43 int v, ret; 44 45 for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++) 46 sp_pci->msix_entry[v].entry = v; 47 48 ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v); 49 if (ret < 0) 50 return ret; 51 52 sp_pci->msix_count = ret; 53 sp->use_tasklet = true; 54 55 sp->psp_irq = sp_pci->msix_entry[0].vector; 56 sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector 57 : sp_pci->msix_entry[0].vector; 58 return 0; 59 } 60 61 static int sp_get_msi_irq(struct sp_device *sp) 62 { 63 struct device *dev = sp->dev; 64 struct pci_dev *pdev = to_pci_dev(dev); 65 int ret; 66 67 ret = pci_enable_msi(pdev); 68 if (ret) 69 return ret; 70 71 sp->ccp_irq = pdev->irq; 72 sp->psp_irq = pdev->irq; 73 74 return 0; 75 } 76 77 static int sp_get_irqs(struct sp_device *sp) 78 { 79 struct device *dev = sp->dev; 80 int ret; 81 82 ret = sp_get_msix_irqs(sp); 83 if (!ret) 84 return 0; 85 86 /* Couldn't get MSI-X vectors, try MSI */ 87 dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret); 88 ret = sp_get_msi_irq(sp); 89 if (!ret) 90 return 0; 91 92 /* Couldn't get MSI interrupt */ 93 dev_notice(dev, "could not enable MSI (%d)\n", ret); 94 95 return ret; 96 } 97 98 static void sp_free_irqs(struct sp_device *sp) 99 { 100 struct sp_pci *sp_pci = sp->dev_specific; 101 struct device *dev = sp->dev; 102 struct pci_dev *pdev = to_pci_dev(dev); 103 104 if (sp_pci->msix_count) 105 pci_disable_msix(pdev); 106 else if (sp->psp_irq) 107 pci_disable_msi(pdev); 108 109 sp->ccp_irq = 0; 110 sp->psp_irq = 0; 111 } 112 113 static bool sp_pci_is_master(struct sp_device *sp) 114 { 115 struct device *dev_cur, *dev_new; 116 struct pci_dev *pdev_cur, *pdev_new; 117 118 dev_new = sp->dev; 119 dev_cur = sp_dev_master->dev; 120 121 pdev_new = to_pci_dev(dev_new); 122 pdev_cur = to_pci_dev(dev_cur); 123 124 if (pdev_new->bus->number < pdev_cur->bus->number) 125 return true; 126 127 if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn)) 128 return true; 129 130 if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn)) 131 return true; 132 133 return false; 134 } 135 136 static void psp_set_master(struct sp_device *sp) 137 { 138 if (!sp_dev_master) { 139 sp_dev_master = sp; 140 return; 141 } 142 143 if (sp_pci_is_master(sp)) 144 sp_dev_master = sp; 145 } 146 147 static struct sp_device *psp_get_master(void) 148 { 149 return sp_dev_master; 150 } 151 152 static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 153 { 154 struct sp_device *sp; 155 struct sp_pci *sp_pci; 156 struct device *dev = &pdev->dev; 157 void __iomem * const *iomap_table; 158 int bar_mask; 159 int ret; 160 161 ret = -ENOMEM; 162 sp = sp_alloc_struct(dev); 163 if (!sp) 164 goto e_err; 165 166 sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL); 167 if (!sp_pci) 168 goto e_err; 169 170 sp->dev_specific = sp_pci; 171 sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data; 172 if (!sp->dev_vdata) { 173 ret = -ENODEV; 174 dev_err(dev, "missing driver data\n"); 175 goto e_err; 176 } 177 178 ret = pcim_enable_device(pdev); 179 if (ret) { 180 dev_err(dev, "pcim_enable_device failed (%d)\n", ret); 181 goto e_err; 182 } 183 184 bar_mask = pci_select_bars(pdev, IORESOURCE_MEM); 185 ret = pcim_iomap_regions(pdev, bar_mask, "ccp"); 186 if (ret) { 187 dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret); 188 goto e_err; 189 } 190 191 iomap_table = pcim_iomap_table(pdev); 192 if (!iomap_table) { 193 dev_err(dev, "pcim_iomap_table failed\n"); 194 ret = -ENOMEM; 195 goto e_err; 196 } 197 198 sp->io_map = iomap_table[sp->dev_vdata->bar]; 199 if (!sp->io_map) { 200 dev_err(dev, "ioremap failed\n"); 201 ret = -ENOMEM; 202 goto e_err; 203 } 204 205 ret = sp_get_irqs(sp); 206 if (ret) 207 goto e_err; 208 209 pci_set_master(pdev); 210 sp->set_psp_master_device = psp_set_master; 211 sp->get_psp_master_device = psp_get_master; 212 213 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); 214 if (ret) { 215 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 216 if (ret) { 217 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", 218 ret); 219 goto e_err; 220 } 221 } 222 223 dev_set_drvdata(dev, sp); 224 225 ret = sp_init(sp); 226 if (ret) 227 goto e_err; 228 229 dev_notice(dev, "enabled\n"); 230 231 return 0; 232 233 e_err: 234 dev_notice(dev, "initialization failed\n"); 235 return ret; 236 } 237 238 static void sp_pci_remove(struct pci_dev *pdev) 239 { 240 struct device *dev = &pdev->dev; 241 struct sp_device *sp = dev_get_drvdata(dev); 242 243 if (!sp) 244 return; 245 246 sp_destroy(sp); 247 248 sp_free_irqs(sp); 249 250 dev_notice(dev, "disabled\n"); 251 } 252 253 #ifdef CONFIG_PM 254 static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state) 255 { 256 struct device *dev = &pdev->dev; 257 struct sp_device *sp = dev_get_drvdata(dev); 258 259 return sp_suspend(sp, state); 260 } 261 262 static int sp_pci_resume(struct pci_dev *pdev) 263 { 264 struct device *dev = &pdev->dev; 265 struct sp_device *sp = dev_get_drvdata(dev); 266 267 return sp_resume(sp); 268 } 269 #endif 270 271 #ifdef CONFIG_CRYPTO_DEV_SP_PSP 272 static const struct psp_vdata psp_entry = { 273 .offset = 0x10500, 274 }; 275 #endif 276 277 static const struct sp_dev_vdata dev_vdata[] = { 278 { 279 .bar = 2, 280 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 281 .ccp_vdata = &ccpv3, 282 #endif 283 }, 284 { 285 .bar = 2, 286 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 287 .ccp_vdata = &ccpv5a, 288 #endif 289 #ifdef CONFIG_CRYPTO_DEV_SP_PSP 290 .psp_vdata = &psp_entry 291 #endif 292 }, 293 { 294 .bar = 2, 295 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 296 .ccp_vdata = &ccpv5b, 297 #endif 298 }, 299 }; 300 static const struct pci_device_id sp_pci_table[] = { 301 { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] }, 302 { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] }, 303 { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] }, 304 /* Last entry must be zero */ 305 { 0, } 306 }; 307 MODULE_DEVICE_TABLE(pci, sp_pci_table); 308 309 static struct pci_driver sp_pci_driver = { 310 .name = "ccp", 311 .id_table = sp_pci_table, 312 .probe = sp_pci_probe, 313 .remove = sp_pci_remove, 314 #ifdef CONFIG_PM 315 .suspend = sp_pci_suspend, 316 .resume = sp_pci_resume, 317 #endif 318 }; 319 320 int sp_pci_init(void) 321 { 322 return pci_register_driver(&sp_pci_driver); 323 } 324 325 void sp_pci_exit(void) 326 { 327 pci_unregister_driver(&sp_pci_driver); 328 } 329