drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  */
  28 #include <drm/drmP.h>
  29 #include "amdgpu.h"
  30 #include "atom.h"
  31
  32 #include <linux/slab.h>
  33 #include <linux/acpi.h>
  34 /*
  35  * BIOS.
  36  */
  37
  38 #define AMD_VBIOS_SIGNATURE " 761295520"
  39 #define AMD_VBIOS_SIGNATURE_OFFSET 0x30
  40 #define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)
  41 #define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)
  42 #define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
  43 #define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
  44
  45 /* If you boot an IGP board with a discrete card as the primary,
  46  * the IGP rom is not accessible via the rom bar as the IGP rom is
  47  * part of the system bios.  On boot, the system bios puts a
  48  * copy of the igp rom at the start of vram if a discrete card is
  49  * present.
  50  */
  51 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
  52 {
  53         uint8_t __iomem *bios;
  54         resource_size_t vram_base;
  55         resource_size_t size = 256 * 1024; /* ??? */
  56
  57         if (!(adev->flags & AMD_IS_APU))
  58                 if (!amdgpu_card_posted(adev))
  59                         return false;
  60
  61         adev->bios = NULL;
  62         vram_base = pci_resource_start(adev->pdev, 0);
  63         bios = ioremap(vram_base, size);
  64         if (!bios) {
  65                 return false;
  66         }
  67
  68         if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) {
  69                 iounmap(bios);
  70                 return false;
  71         }
  72         adev->bios = kmalloc(size, GFP_KERNEL);
  73         if (!adev->bios) {
  74                 iounmap(bios);
  75                 return false;
  76         }
  77         adev->bios_size = size;
  78         memcpy_fromio(adev->bios, bios, size);
  79         iounmap(bios);
  80         return true;
  81 }
  82
  83 bool amdgpu_read_bios(struct amdgpu_device *adev)
  84 {
  85         uint8_t __iomem *bios, val[2];
  86         size_t size;
  87
  88         adev->bios = NULL;
  89         /* XXX: some cards may return 0 for rom size? ddx has a workaround */
  90         bios = pci_map_rom(adev->pdev, &size);
  91         if (!bios) {
  92                 return false;
  93         }
  94
  95         val[0] = readb(&bios[0]);
  96         val[1] = readb(&bios[1]);
  97
  98         if (size == 0 || !AMD_IS_VALID_VBIOS(val)) {
  99                 pci_unmap_rom(adev->pdev, bios);
 100                 return false;
 101         }
 102         adev->bios = kzalloc(size, GFP_KERNEL);
 103         if (adev->bios == NULL) {
 104                 pci_unmap_rom(adev->pdev, bios);
 105                 return false;
 106         }
 107         adev->bios_size = size;
 108         memcpy_fromio(adev->bios, bios, size);
 109         pci_unmap_rom(adev->pdev, bios);
 110         return true;
 111 }
 112
 113 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
 114 {
 115         u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
 116         int len;
 117
 118         if (!adev->asic_funcs->read_bios_from_rom)
 119                 return false;
 120
 121         /* validate VBIOS signature */
 122         if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
 123                 return false;
 124         header[AMD_VBIOS_SIGNATURE_END] = 0;
 125
 126         if ((!AMD_IS_VALID_VBIOS(header)) ||
 127             0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
 128                         AMD_VBIOS_SIGNATURE,
 129                         strlen(AMD_VBIOS_SIGNATURE)))
 130                 return false;
 131
 132         /* valid vbios, go on */
 133         len = AMD_VBIOS_LENGTH(header);
 134         len = ALIGN(len, 4);
 135         adev->bios = kmalloc(len, GFP_KERNEL);
 136         if (!adev->bios) {
 137                 DRM_ERROR("no memory to allocate for BIOS\n");
 138                 return false;
 139         }
 140         adev->bios_size = len;
 141
 142         /* read complete BIOS */
 143         return amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
 144 }
 145
 146 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
 147 {
 148         uint8_t __iomem *bios;
 149         size_t size;
 150
 151         adev->bios = NULL;
 152
 153         bios = pci_platform_rom(adev->pdev, &size);
 154         if (!bios) {
 155                 return false;
 156         }
 157
 158         if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) {
 159                 return false;
 160         }
 161         adev->bios = kmemdup(bios, size, GFP_KERNEL);
 162         if (adev->bios == NULL) {
 163                 return false;
 164         }
 165         adev->bios_size = size;
 166
 167         return true;
 168 }
 169
 170 #ifdef CONFIG_ACPI
 171 /* ATRM is used to get the BIOS on the discrete cards in
 172  * dual-gpu systems.
 173  */
 174 /* retrieve the ROM in 4k blocks */
 175 #define ATRM_BIOS_PAGE 4096
 176 /**
 177  * amdgpu_atrm_call - fetch a chunk of the vbios
 178  *
 179  * @atrm_handle: acpi ATRM handle
 180  * @bios: vbios image pointer
 181  * @offset: offset of vbios image data to fetch
 182  * @len: length of vbios image data to fetch
 183  *
 184  * Executes ATRM to fetch a chunk of the discrete
 185  * vbios image on PX systems (all asics).
 186  * Returns the length of the buffer fetched.
 187  */
 188 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
 189                             int offset, int len)
 190 {
 191         acpi_status status;
 192         union acpi_object atrm_arg_elements[2], *obj;
 193         struct acpi_object_list atrm_arg;
 194         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 195
 196         atrm_arg.count = 2;
 197         atrm_arg.pointer = &atrm_arg_elements[0];
 198
 199         atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
 200         atrm_arg_elements[0].integer.value = offset;
 201
 202         atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
 203         atrm_arg_elements[1].integer.value = len;
 204
 205         status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
 206         if (ACPI_FAILURE(status)) {
 207                 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
 208                 return -ENODEV;
 209         }
 210
 211         obj = (union acpi_object *)buffer.pointer;
 212         memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
 213         len = obj->buffer.length;
 214         kfree(buffer.pointer);
 215         return len;
 216 }
 217
 218 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
 219 {
 220         int ret;
 221         int size = 256 * 1024;
 222         int i;
 223         struct pci_dev *pdev = NULL;
 224         acpi_handle dhandle, atrm_handle;
 225         acpi_status status;
 226         bool found = false;
 227
 228         /* ATRM is for the discrete card only */
 229         if (adev->flags & AMD_IS_APU)
 230                 return false;
 231
 232         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 233                 dhandle = ACPI_HANDLE(&pdev->dev);
 234                 if (!dhandle)
 235                         continue;
 236
 237                 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
 238                 if (!ACPI_FAILURE(status)) {
 239                         found = true;
 240                         break;
 241                 }
 242         }
 243
 244         if (!found) {
 245                 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
 246                         dhandle = ACPI_HANDLE(&pdev->dev);
 247                         if (!dhandle)
 248                                 continue;
 249
 250                         status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
 251                         if (!ACPI_FAILURE(status)) {
 252                                 found = true;
 253                                 break;
 254                         }
 255                 }
 256         }
 257
 258         if (!found)
 259                 return false;
 260
 261         adev->bios = kmalloc(size, GFP_KERNEL);
 262         if (!adev->bios) {
 263                 DRM_ERROR("Unable to allocate bios\n");
 264                 return false;
 265         }
 266
 267         for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
 268                 ret = amdgpu_atrm_call(atrm_handle,
 269                                        adev->bios,
 270                                        (i * ATRM_BIOS_PAGE),
 271                                        ATRM_BIOS_PAGE);
 272                 if (ret < ATRM_BIOS_PAGE)
 273                         break;
 274         }
 275
 276         if (i == 0 || !AMD_IS_VALID_VBIOS(adev->bios)) {
 277                 kfree(adev->bios);
 278                 return false;
 279         }
 280         adev->bios_size = size;
 281         return true;
 282 }
 283 #else
 284 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
 285 {
 286         return false;
 287 }
 288 #endif
 289
 290 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
 291 {
 292         if (adev->flags & AMD_IS_APU)
 293                 return igp_read_bios_from_vram(adev);
 294         else
 295                 return amdgpu_asic_read_disabled_bios(adev);
 296 }
 297
 298 #ifdef CONFIG_ACPI
 299 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
 300 {
 301         bool ret = false;
 302         struct acpi_table_header *hdr;
 303         acpi_size tbl_size;
 304         UEFI_ACPI_VFCT *vfct;
 305         GOP_VBIOS_CONTENT *vbios;
 306         VFCT_IMAGE_HEADER *vhdr;
 307
 308         if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
 309                 return false;
 310         tbl_size = hdr->length;
 311         if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
 312                 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
 313                 goto out_unmap;
 314         }
 315
 316         vfct = (UEFI_ACPI_VFCT *)hdr;
 317         if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) {
 318                 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
 319                 goto out_unmap;
 320         }
 321
 322         vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset);
 323         vhdr = &vbios->VbiosHeader;
 324         DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n",
 325                         vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction,
 326                         vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength);
 327
 328         if (vhdr->PCIBus != adev->pdev->bus->number ||
 329             vhdr->PCIDevice != PCI_SLOT(adev->pdev->devfn) ||
 330             vhdr->PCIFunction != PCI_FUNC(adev->pdev->devfn) ||
 331             vhdr->VendorID != adev->pdev->vendor ||
 332             vhdr->DeviceID != adev->pdev->device) {
 333                 DRM_INFO("ACPI VFCT table is not for this card\n");
 334                 goto out_unmap;
 335         }
 336
 337         if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) {
 338                 DRM_ERROR("ACPI VFCT image truncated\n");
 339                 goto out_unmap;
 340         }
 341
 342         adev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL);
 343         adev->bios_size = vhdr->ImageLength;
 344         ret = !!adev->bios;
 345
 346 out_unmap:
 347         return ret;
 348 }
 349 #else
 350 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
 351 {
 352         return false;
 353 }
 354 #endif
 355
 356 bool amdgpu_get_bios(struct amdgpu_device *adev)
 357 {
 358         bool r;
 359         uint16_t tmp, bios_header_start;
 360
 361         r = amdgpu_atrm_get_bios(adev);
 362         if (!r)
 363                 r = amdgpu_acpi_vfct_bios(adev);
 364         if (!r)
 365                 r = igp_read_bios_from_vram(adev);
 366         if (!r)
 367                 r = amdgpu_read_bios(adev);
 368         if (!r) {
 369                 r = amdgpu_read_bios_from_rom(adev);
 370         }
 371         if (!r) {
 372                 r = amdgpu_read_disabled_bios(adev);
 373         }
 374         if (!r) {
 375                 r = amdgpu_read_platform_bios(adev);
 376         }
 377         if (!r || adev->bios == NULL) {
 378                 DRM_ERROR("Unable to locate a BIOS ROM\n");
 379                 adev->bios = NULL;
 380                 return false;
 381         }
 382         if (!AMD_IS_VALID_VBIOS(adev->bios)) {
 383                 printk("BIOS signature incorrect %x %x\n", adev->bios[0], adev->bios[1]);
 384                 goto free_bios;
 385         }
 386
 387         tmp = RBIOS16(0x18);
 388         if (RBIOS8(tmp + 0x14) != 0x0) {
 389                 DRM_INFO("Not an x86 BIOS ROM, not using.\n");
 390                 goto free_bios;
 391         }
 392
 393         bios_header_start = RBIOS16(0x48);
 394         if (!bios_header_start) {
 395                 goto free_bios;
 396         }
 397         tmp = bios_header_start + 4;
 398         if (!memcmp(adev->bios + tmp, "ATOM", 4) ||
 399             !memcmp(adev->bios + tmp, "MOTA", 4)) {
 400                 adev->is_atom_bios = true;
 401         } else {
 402                 adev->is_atom_bios = false;
 403         }
 404
 405         DRM_DEBUG("%sBIOS detected\n", adev->is_atom_bios ? "ATOM" : "COM");
 406         return true;
 407 free_bios:
 408         kfree(adev->bios);
 409         adev->bios = NULL;
 410         return false;
 411 }