drivers/crypto/ccp/ccp-pci.c

   1 /*
   2  * AMD Cryptographic Coprocessor (CCP) 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
  29 #define MSIX_VECTORS                    2
  30
  31 struct ccp_msix {
  32         u32 vector;
  33         char name[16];
  34 };
  35
  36 struct ccp_pci {
  37         int msix_count;
  38         struct ccp_msix msix[MSIX_VECTORS];
  39 };
  40
  41 static int ccp_get_msix_irqs(struct ccp_device *ccp)
  42 {
  43         struct ccp_pci *ccp_pci = ccp->dev_specific;
  44         struct device *dev = ccp->dev;
  45         struct pci_dev *pdev = to_pci_dev(dev);
  46         struct msix_entry msix_entry[MSIX_VECTORS];
  47         unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
  48         int v, ret;
  49
  50         for (v = 0; v < ARRAY_SIZE(msix_entry); v++)
  51                 msix_entry[v].entry = v;
  52
  53         ret = pci_enable_msix_range(pdev, msix_entry, 1, v);
  54         if (ret < 0)
  55                 return ret;
  56
  57         ccp_pci->msix_count = ret;
  58         for (v = 0; v < ccp_pci->msix_count; v++) {
  59                 /* Set the interrupt names and request the irqs */
  60                 snprintf(ccp_pci->msix[v].name, name_len, "%s-%u",
  61                          ccp->name, v);
  62                 ccp_pci->msix[v].vector = msix_entry[v].vector;
  63                 ret = request_irq(ccp_pci->msix[v].vector,
  64                                   ccp->vdata->perform->irqhandler,
  65                                   0, ccp_pci->msix[v].name, dev);
  66                 if (ret) {
  67                         dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
  68                                    ret);
  69                         goto e_irq;
  70                 }
  71         }
  72
  73         return 0;
  74
  75 e_irq:
  76         while (v--)
  77                 free_irq(ccp_pci->msix[v].vector, dev);
  78
  79         pci_disable_msix(pdev);
  80
  81         ccp_pci->msix_count = 0;
  82
  83         return ret;
  84 }
  85
  86 static int ccp_get_msi_irq(struct ccp_device *ccp)
  87 {
  88         struct device *dev = ccp->dev;
  89         struct pci_dev *pdev = to_pci_dev(dev);
  90         int ret;
  91
  92         ret = pci_enable_msi(pdev);
  93         if (ret)
  94                 return ret;
  95
  96         ccp->irq = pdev->irq;
  97         ret = request_irq(ccp->irq, ccp->vdata->perform->irqhandler, 0,
  98                           ccp->name, dev);
  99         if (ret) {
 100                 dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
 101                 goto e_msi;
 102         }
 103
 104         return 0;
 105
 106 e_msi:
 107         pci_disable_msi(pdev);
 108
 109         return ret;
 110 }
 111
 112 static int ccp_get_irqs(struct ccp_device *ccp)
 113 {
 114         struct device *dev = ccp->dev;
 115         int ret;
 116
 117         ret = ccp_get_msix_irqs(ccp);
 118         if (!ret)
 119                 return 0;
 120
 121         /* Couldn't get MSI-X vectors, try MSI */
 122         dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
 123         ret = ccp_get_msi_irq(ccp);
 124         if (!ret)
 125                 return 0;
 126
 127         /* Couldn't get MSI interrupt */
 128         dev_notice(dev, "could not enable MSI (%d)\n", ret);
 129
 130         return ret;
 131 }
 132
 133 static void ccp_free_irqs(struct ccp_device *ccp)
 134 {
 135         struct ccp_pci *ccp_pci = ccp->dev_specific;
 136         struct device *dev = ccp->dev;
 137         struct pci_dev *pdev = to_pci_dev(dev);
 138
 139         if (ccp_pci->msix_count) {
 140                 while (ccp_pci->msix_count--)
 141                         free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
 142                                  dev);
 143                 pci_disable_msix(pdev);
 144         } else if (ccp->irq) {
 145                 free_irq(ccp->irq, dev);
 146                 pci_disable_msi(pdev);
 147         }
 148         ccp->irq = 0;
 149 }
 150
 151 static int ccp_find_mmio_area(struct ccp_device *ccp)
 152 {
 153         struct device *dev = ccp->dev;
 154         struct pci_dev *pdev = to_pci_dev(dev);
 155         resource_size_t io_len;
 156         unsigned long io_flags;
 157
 158         io_flags = pci_resource_flags(pdev, ccp->vdata->bar);
 159         io_len = pci_resource_len(pdev, ccp->vdata->bar);
 160         if ((io_flags & IORESOURCE_MEM) &&
 161             (io_len >= (ccp->vdata->offset + 0x800)))
 162                 return ccp->vdata->bar;
 163
 164         return -EIO;
 165 }
 166
 167 static int ccp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 168 {
 169         struct ccp_device *ccp;
 170         struct ccp_pci *ccp_pci;
 171         struct device *dev = &pdev->dev;
 172         unsigned int bar;
 173         int ret;
 174
 175         ret = -ENOMEM;
 176         ccp = ccp_alloc_struct(dev);
 177         if (!ccp)
 178                 goto e_err;
 179
 180         ccp_pci = devm_kzalloc(dev, sizeof(*ccp_pci), GFP_KERNEL);
 181         if (!ccp_pci)
 182                 goto e_err;
 183
 184         ccp->dev_specific = ccp_pci;
 185         ccp->vdata = (struct ccp_vdata *)id->driver_data;
 186         if (!ccp->vdata || !ccp->vdata->version) {
 187                 ret = -ENODEV;
 188                 dev_err(dev, "missing driver data\n");
 189                 goto e_err;
 190         }
 191         ccp->get_irq = ccp_get_irqs;
 192         ccp->free_irq = ccp_free_irqs;
 193
 194         ret = pci_request_regions(pdev, "ccp");
 195         if (ret) {
 196                 dev_err(dev, "pci_request_regions failed (%d)\n", ret);
 197                 goto e_err;
 198         }
 199
 200         ret = pci_enable_device(pdev);
 201         if (ret) {
 202                 dev_err(dev, "pci_enable_device failed (%d)\n", ret);
 203                 goto e_regions;
 204         }
 205
 206         pci_set_master(pdev);
 207
 208         ret = ccp_find_mmio_area(ccp);
 209         if (ret < 0)
 210                 goto e_device;
 211         bar = ret;
 212
 213         ret = -EIO;
 214         ccp->io_map = pci_iomap(pdev, bar, 0);
 215         if (!ccp->io_map) {
 216                 dev_err(dev, "pci_iomap failed\n");
 217                 goto e_device;
 218         }
 219         ccp->io_regs = ccp->io_map + ccp->vdata->offset;
 220
 221         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 222         if (ret) {
 223                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 224                 if (ret) {
 225                         dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
 226                                 ret);
 227                         goto e_iomap;
 228                 }
 229         }
 230
 231         dev_set_drvdata(dev, ccp);
 232
 233         if (ccp->vdata->setup)
 234                 ccp->vdata->setup(ccp);
 235
 236         ret = ccp->vdata->perform->init(ccp);
 237         if (ret)
 238                 goto e_iomap;
 239
 240         dev_notice(dev, "enabled\n");
 241
 242         return 0;
 243
 244 e_iomap:
 245         pci_iounmap(pdev, ccp->io_map);
 246
 247 e_device:
 248         pci_disable_device(pdev);
 249
 250 e_regions:
 251         pci_release_regions(pdev);
 252
 253 e_err:
 254         dev_notice(dev, "initialization failed\n");
 255         return ret;
 256 }
 257
 258 static void ccp_pci_remove(struct pci_dev *pdev)
 259 {
 260         struct device *dev = &pdev->dev;
 261         struct ccp_device *ccp = dev_get_drvdata(dev);
 262
 263         if (!ccp)
 264                 return;
 265
 266         ccp->vdata->perform->destroy(ccp);
 267
 268         pci_iounmap(pdev, ccp->io_map);
 269
 270         pci_disable_device(pdev);
 271
 272         pci_release_regions(pdev);
 273
 274         dev_notice(dev, "disabled\n");
 275 }
 276
 277 #ifdef CONFIG_PM
 278 static int ccp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 279 {
 280         struct device *dev = &pdev->dev;
 281         struct ccp_device *ccp = dev_get_drvdata(dev);
 282         unsigned long flags;
 283         unsigned int i;
 284
 285         spin_lock_irqsave(&ccp->cmd_lock, flags);
 286
 287         ccp->suspending = 1;
 288
 289         /* Wake all the queue kthreads to prepare for suspend */
 290         for (i = 0; i < ccp->cmd_q_count; i++)
 291                 wake_up_process(ccp->cmd_q[i].kthread);
 292
 293         spin_unlock_irqrestore(&ccp->cmd_lock, flags);
 294
 295         /* Wait for all queue kthreads to say they're done */
 296         while (!ccp_queues_suspended(ccp))
 297                 wait_event_interruptible(ccp->suspend_queue,
 298                                          ccp_queues_suspended(ccp));
 299
 300         return 0;
 301 }
 302
 303 static int ccp_pci_resume(struct pci_dev *pdev)
 304 {
 305         struct device *dev = &pdev->dev;
 306         struct ccp_device *ccp = dev_get_drvdata(dev);
 307         unsigned long flags;
 308         unsigned int i;
 309
 310         spin_lock_irqsave(&ccp->cmd_lock, flags);
 311
 312         ccp->suspending = 0;
 313
 314         /* Wake up all the kthreads */
 315         for (i = 0; i < ccp->cmd_q_count; i++) {
 316                 ccp->cmd_q[i].suspended = 0;
 317                 wake_up_process(ccp->cmd_q[i].kthread);
 318         }
 319
 320         spin_unlock_irqrestore(&ccp->cmd_lock, flags);
 321
 322         return 0;
 323 }
 324 #endif
 325
 326 static const struct pci_device_id ccp_pci_table[] = {
 327         { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&ccpv3 },
 328         { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&ccpv5a },
 329         { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&ccpv5b },
 330         /* Last entry must be zero */
 331         { 0, }
 332 };
 333 MODULE_DEVICE_TABLE(pci, ccp_pci_table);
 334
 335 static struct pci_driver ccp_pci_driver = {
 336         .name = "ccp",
 337         .id_table = ccp_pci_table,
 338         .probe = ccp_pci_probe,
 339         .remove = ccp_pci_remove,
 340 #ifdef CONFIG_PM
 341         .suspend = ccp_pci_suspend,
 342         .resume = ccp_pci_resume,
 343 #endif
 344 };
 345
 346 int ccp_pci_init(void)
 347 {
 348         return pci_register_driver(&ccp_pci_driver);
 349 }
 350
 351 void ccp_pci_exit(void)
 352 {
 353         pci_unregister_driver(&ccp_pci_driver);
 354 }