drivers/crypto/ccp/sp-pci.c

   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 pspv1 = {
 273         .cmdresp_reg            = 0x10580,
 274         .cmdbuff_addr_lo_reg    = 0x105e0,
 275         .cmdbuff_addr_hi_reg    = 0x105e4,
 276         .feature_reg            = 0x105fc,
 277         .inten_reg              = 0x10610,
 278         .intsts_reg             = 0x10614,
 279 };
 280
 281 static const struct psp_vdata pspv2 = {
 282         .cmdresp_reg            = 0x10980,
 283         .cmdbuff_addr_lo_reg    = 0x109e0,
 284         .cmdbuff_addr_hi_reg    = 0x109e4,
 285         .feature_reg            = 0x109fc,
 286         .inten_reg              = 0x10690,
 287         .intsts_reg             = 0x10694,
 288 };
 289 #endif
 290
 291 static const struct sp_dev_vdata dev_vdata[] = {
 292         {       /* 0 */
 293                 .bar = 2,
 294 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 295                 .ccp_vdata = &ccpv3,
 296 #endif
 297         },
 298         {       /* 1 */
 299                 .bar = 2,
 300 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 301                 .ccp_vdata = &ccpv5a,
 302 #endif
 303 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 304                 .psp_vdata = &pspv1,
 305 #endif
 306         },
 307         {       /* 2 */
 308                 .bar = 2,
 309 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 310                 .ccp_vdata = &ccpv5b,
 311 #endif
 312         },
 313         {       /* 3 */
 314                 .bar = 2,
 315 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 316                 .ccp_vdata = &ccpv5a,
 317 #endif
 318 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 319                 .psp_vdata = &pspv2,
 320 #endif
 321         },
 322 };
 323 static const struct pci_device_id sp_pci_table[] = {
 324         { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
 325         { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
 326         { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
 327         { PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] },
 328         /* Last entry must be zero */
 329         { 0, }
 330 };
 331 MODULE_DEVICE_TABLE(pci, sp_pci_table);
 332
 333 static struct pci_driver sp_pci_driver = {
 334         .name = "ccp",
 335         .id_table = sp_pci_table,
 336         .probe = sp_pci_probe,
 337         .remove = sp_pci_remove,
 338 #ifdef CONFIG_PM
 339         .suspend = sp_pci_suspend,
 340         .resume = sp_pci_resume,
 341 #endif
 342 };
 343
 344 int sp_pci_init(void)
 345 {
 346         return pci_register_driver(&sp_pci_driver);
 347 }
 348
 349 void sp_pci_exit(void)
 350 {
 351         pci_unregister_driver(&sp_pci_driver);
 352 }