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 /* Check if current bios is an ATOM BIOS.
  46  * Return true if it is ATOM BIOS. Otherwise, return false.
  47  */
  48 static bool check_atom_bios(uint8_t *bios, size_t size)
  49 {
  50         uint16_t tmp, bios_header_start;
  51
  52         if (!bios || size < 0x49) {
  53                 DRM_INFO("vbios mem is null or mem size is wrong\n");
  54                 return false;
  55         }
  56
  57         if (!AMD_IS_VALID_VBIOS(bios)) {
  58                 DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]);
  59                 return false;
  60         }
  61
  62         bios_header_start = bios[0x48] | (bios[0x49] << 8);
  63         if (!bios_header_start) {
  64                 DRM_INFO("Can't locate bios header\n");
  65                 return false;
  66         }
  67
  68         tmp = bios_header_start + 4;
  69         if (size < tmp) {
  70                 DRM_INFO("BIOS header is broken\n");
  71                 return false;
  72         }
  73
  74         if (!memcmp(bios + tmp, "ATOM", 4) ||
  75             !memcmp(bios + tmp, "MOTA", 4)) {
  76                 DRM_DEBUG("ATOMBIOS detected\n");
  77                 return true;
  78         }
  79
  80         return false;
  81 }
  82
  83 /* If you boot an IGP board with a discrete card as the primary,
  84  * the IGP rom is not accessible via the rom bar as the IGP rom is
  85  * part of the system bios.  On boot, the system bios puts a
  86  * copy of the igp rom at the start of vram if a discrete card is
  87  * present.
  88  */
  89 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
  90 {
  91         uint8_t __iomem *bios;
  92         resource_size_t vram_base;
  93         resource_size_t size = 256 * 1024; /* ??? */
  94
  95         if (!(adev->flags & AMD_IS_APU))
  96                 if (amdgpu_device_need_post(adev))
  97                         return false;
  98
  99         adev->bios = NULL;
 100         vram_base = pci_resource_start(adev->pdev, 0);
 101         bios = ioremap_wc(vram_base, size);
 102         if (!bios) {
 103                 return false;
 104         }
 105
 106         adev->bios = kmalloc(size, GFP_KERNEL);
 107         if (!adev->bios) {
 108                 iounmap(bios);
 109                 return false;
 110         }
 111         adev->bios_size = size;
 112         memcpy_fromio(adev->bios, bios, size);
 113         iounmap(bios);
 114
 115         if (!check_atom_bios(adev->bios, size)) {
 116                 kfree(adev->bios);
 117                 return false;
 118         }
 119
 120         return true;
 121 }
 122
 123 bool amdgpu_read_bios(struct amdgpu_device *adev)
 124 {
 125         uint8_t __iomem *bios;
 126         size_t size;
 127
 128         adev->bios = NULL;
 129         /* XXX: some cards may return 0 for rom size? ddx has a workaround */
 130         bios = pci_map_rom(adev->pdev, &size);
 131         if (!bios) {
 132                 return false;
 133         }
 134
 135         adev->bios = kzalloc(size, GFP_KERNEL);
 136         if (adev->bios == NULL) {
 137                 pci_unmap_rom(adev->pdev, bios);
 138                 return false;
 139         }
 140         adev->bios_size = size;
 141         memcpy_fromio(adev->bios, bios, size);
 142         pci_unmap_rom(adev->pdev, bios);
 143
 144         if (!check_atom_bios(adev->bios, size)) {
 145                 kfree(adev->bios);
 146                 return false;
 147         }
 148
 149         return true;
 150 }
 151
 152 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
 153 {
 154         u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
 155         int len;
 156
 157         if (!adev->asic_funcs->read_bios_from_rom)
 158                 return false;
 159
 160         /* validate VBIOS signature */
 161         if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
 162                 return false;
 163         header[AMD_VBIOS_SIGNATURE_END] = 0;
 164
 165         if ((!AMD_IS_VALID_VBIOS(header)) ||
 166             0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
 167                         AMD_VBIOS_SIGNATURE,
 168                         strlen(AMD_VBIOS_SIGNATURE)))
 169                 return false;
 170
 171         /* valid vbios, go on */
 172         len = AMD_VBIOS_LENGTH(header);
 173         len = ALIGN(len, 4);
 174         adev->bios = kmalloc(len, GFP_KERNEL);
 175         if (!adev->bios) {
 176                 DRM_ERROR("no memory to allocate for BIOS\n");
 177                 return false;
 178         }
 179         adev->bios_size = len;
 180
 181         /* read complete BIOS */
 182         amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
 183
 184         if (!check_atom_bios(adev->bios, len)) {
 185                 kfree(adev->bios);
 186                 return false;
 187         }
 188
 189         return true;
 190 }
 191
 192 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
 193 {
 194         uint8_t __iomem *bios;
 195         size_t size;
 196
 197         adev->bios = NULL;
 198
 199         bios = pci_platform_rom(adev->pdev, &size);
 200         if (!bios) {
 201                 return false;
 202         }
 203
 204         adev->bios = kzalloc(size, GFP_KERNEL);
 205         if (adev->bios == NULL)
 206                 return false;
 207
 208         memcpy_fromio(adev->bios, bios, size);
 209
 210         if (!check_atom_bios(adev->bios, size)) {
 211                 kfree(adev->bios);
 212                 return false;
 213         }
 214
 215         adev->bios_size = size;
 216
 217         return true;
 218 }
 219
 220 #ifdef CONFIG_ACPI
 221 /* ATRM is used to get the BIOS on the discrete cards in
 222  * dual-gpu systems.
 223  */
 224 /* retrieve the ROM in 4k blocks */
 225 #define ATRM_BIOS_PAGE 4096
 226 /**
 227  * amdgpu_atrm_call - fetch a chunk of the vbios
 228  *
 229  * @atrm_handle: acpi ATRM handle
 230  * @bios: vbios image pointer
 231  * @offset: offset of vbios image data to fetch
 232  * @len: length of vbios image data to fetch
 233  *
 234  * Executes ATRM to fetch a chunk of the discrete
 235  * vbios image on PX systems (all asics).
 236  * Returns the length of the buffer fetched.
 237  */
 238 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
 239                             int offset, int len)
 240 {
 241         acpi_status status;
 242         union acpi_object atrm_arg_elements[2], *obj;
 243         struct acpi_object_list atrm_arg;
 244         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 245
 246         atrm_arg.count = 2;
 247         atrm_arg.pointer = &atrm_arg_elements[0];
 248
 249         atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
 250         atrm_arg_elements[0].integer.value = offset;
 251
 252         atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
 253         atrm_arg_elements[1].integer.value = len;
 254
 255         status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
 256         if (ACPI_FAILURE(status)) {
 257                 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
 258                 return -ENODEV;
 259         }
 260
 261         obj = (union acpi_object *)buffer.pointer;
 262         memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
 263         len = obj->buffer.length;
 264         kfree(buffer.pointer);
 265         return len;
 266 }
 267
 268 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
 269 {
 270         int ret;
 271         int size = 256 * 1024;
 272         int i;
 273         struct pci_dev *pdev = NULL;
 274         acpi_handle dhandle, atrm_handle;
 275         acpi_status status;
 276         bool found = false;
 277
 278         /* ATRM is for the discrete card only */
 279         if (adev->flags & AMD_IS_APU)
 280                 return false;
 281
 282         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 283                 dhandle = ACPI_HANDLE(&pdev->dev);
 284                 if (!dhandle)
 285                         continue;
 286
 287                 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
 288                 if (!ACPI_FAILURE(status)) {
 289                         found = true;
 290                         break;
 291                 }
 292         }
 293
 294         if (!found) {
 295                 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
 296                         dhandle = ACPI_HANDLE(&pdev->dev);
 297                         if (!dhandle)
 298                                 continue;
 299
 300                         status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
 301                         if (!ACPI_FAILURE(status)) {
 302                                 found = true;
 303                                 break;
 304                         }
 305                 }
 306         }
 307
 308         if (!found)
 309                 return false;
 310
 311         adev->bios = kmalloc(size, GFP_KERNEL);
 312         if (!adev->bios) {
 313                 DRM_ERROR("Unable to allocate bios\n");
 314                 return false;
 315         }
 316
 317         for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
 318                 ret = amdgpu_atrm_call(atrm_handle,
 319                                        adev->bios,
 320                                        (i * ATRM_BIOS_PAGE),
 321                                        ATRM_BIOS_PAGE);
 322                 if (ret < ATRM_BIOS_PAGE)
 323                         break;
 324         }
 325
 326         if (!check_atom_bios(adev->bios, size)) {
 327                 kfree(adev->bios);
 328                 return false;
 329         }
 330         adev->bios_size = size;
 331         return true;
 332 }
 333 #else
 334 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
 335 {
 336         return false;
 337 }
 338 #endif
 339
 340 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
 341 {
 342         if (adev->flags & AMD_IS_APU)
 343                 return igp_read_bios_from_vram(adev);
 344         else
 345                 return amdgpu_asic_read_disabled_bios(adev);
 346 }
 347
 348 #ifdef CONFIG_ACPI
 349 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
 350 {
 351         struct acpi_table_header *hdr;
 352         acpi_size tbl_size;
 353         UEFI_ACPI_VFCT *vfct;
 354         unsigned offset;
 355
 356         if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
 357                 return false;
 358         tbl_size = hdr->length;
 359         if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
 360                 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
 361                 return false;
 362         }
 363
 364         vfct = (UEFI_ACPI_VFCT *)hdr;
 365         offset = vfct->VBIOSImageOffset;
 366
 367         while (offset < tbl_size) {
 368                 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
 369                 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
 370
 371                 offset += sizeof(VFCT_IMAGE_HEADER);
 372                 if (offset > tbl_size) {
 373                         DRM_ERROR("ACPI VFCT image header truncated\n");
 374                         return false;
 375                 }
 376
 377                 offset += vhdr->ImageLength;
 378                 if (offset > tbl_size) {
 379                         DRM_ERROR("ACPI VFCT image truncated\n");
 380                         return false;
 381                 }
 382
 383                 if (vhdr->ImageLength &&
 384                     vhdr->PCIBus == adev->pdev->bus->number &&
 385                     vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
 386                     vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
 387                     vhdr->VendorID == adev->pdev->vendor &&
 388                     vhdr->DeviceID == adev->pdev->device) {
 389                         adev->bios = kmemdup(&vbios->VbiosContent,
 390                                              vhdr->ImageLength,
 391                                              GFP_KERNEL);
 392
 393                         if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
 394                                 kfree(adev->bios);
 395                                 return false;
 396                         }
 397                         adev->bios_size = vhdr->ImageLength;
 398                         return true;
 399                 }
 400         }
 401
 402         DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
 403         return false;
 404 }
 405 #else
 406 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
 407 {
 408         return false;
 409 }
 410 #endif
 411
 412 bool amdgpu_get_bios(struct amdgpu_device *adev)
 413 {
 414         if (amdgpu_atrm_get_bios(adev))
 415                 goto success;
 416
 417         if (amdgpu_acpi_vfct_bios(adev))
 418                 goto success;
 419
 420         if (igp_read_bios_from_vram(adev))
 421                 goto success;
 422
 423         if (amdgpu_read_bios(adev))
 424                 goto success;
 425
 426         if (amdgpu_read_bios_from_rom(adev))
 427                 goto success;
 428
 429         if (amdgpu_read_disabled_bios(adev))
 430                 goto success;
 431
 432         if (amdgpu_read_platform_bios(adev))
 433                 goto success;
 434
 435         DRM_ERROR("Unable to locate a BIOS ROM\n");
 436         return false;
 437
 438 success:
 439         adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false;
 440         return true;
 441 }