cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
#include <drm/drmP.h>
#include "amdgpu.h"
#include "atom.h"

#include <linux/slab.h>
#include <linux/acpi.h>
/*
 * BIOS.
 */


#define AMD_VBIOS_SIGNATURE " 761295520"

#define AMD_VBIOS_SIGNATURE_OFFSET 0x30

#define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)

#define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)

#define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)

#define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)

/* Check if current bios is an ATOM BIOS.
 * Return true if it is ATOM BIOS. Otherwise, return false.
 */

static bool check_atom_bios(uint8_t *bios, size_t size) { uint16_t tmp, bios_header_start; if (!bios || size < 0x49) { DRM_INFO("vbios mem is null or mem size is wrong\n"); return false; } if (!AMD_IS_VALID_VBIOS(bios)) { DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]); return false; } tmp = bios[0x18] | (bios[0x19] << 8); if (bios[tmp + 0x14] != 0x0) { DRM_INFO("Not an x86 BIOS ROM\n"); return false; } bios_header_start = bios[0x48] | (bios[0x49] << 8); if (!bios_header_start) { DRM_INFO("Can't locate bios header\n"); return false; } tmp = bios_header_start + 4; if (size < tmp) { DRM_INFO("BIOS header is broken\n"); return false; } if (!memcmp(bios + tmp, "ATOM", 4) || !memcmp(bios + tmp, "MOTA", 4)) { DRM_DEBUG("ATOMBIOS detected\n"); return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Ken Xue194100.00%1100.00%
Total194100.00%1100.00%

/* If you boot an IGP board with a discrete card as the primary, * the IGP rom is not accessible via the rom bar as the IGP rom is * part of the system bios. On boot, the system bios puts a * copy of the igp rom at the start of vram if a discrete card is * present. */
static bool igp_read_bios_from_vram(struct amdgpu_device *adev) { uint8_t __iomem *bios; resource_size_t vram_base; resource_size_t size = 256 * 1024; /* ??? */ if (!(adev->flags & AMD_IS_APU)) if (amdgpu_need_post(adev)) return false; adev->bios = NULL; vram_base = pci_resource_start(adev->pdev, 0); bios = ioremap(vram_base, size); if (!bios) { return false; } adev->bios = kmalloc(size, GFP_KERNEL); if (!adev->bios) { iounmap(bios); return false; } adev->bios_size = size; memcpy_fromio(adev->bios, bios, size); iounmap(bios); if (!check_atom_bios(adev->bios, size)) { kfree(adev->bios); return false; } return true; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher12879.50%116.67%
Ken Xue2414.91%116.67%
Evan Quan63.73%116.67%
Jammy Zhou10.62%116.67%
Ravikant B Sharma10.62%116.67%
jimqu10.62%116.67%
Total161100.00%6100.00%


bool amdgpu_read_bios(struct amdgpu_device *adev) { uint8_t __iomem *bios; size_t size; adev->bios = NULL; /* XXX: some cards may return 0 for rom size? ddx has a workaround */ bios = pci_map_rom(adev->pdev, &size); if (!bios) { return false; } adev->bios = kzalloc(size, GFP_KERNEL); if (adev->bios == NULL) { pci_unmap_rom(adev->pdev, bios); return false; } adev->bios_size = size; memcpy_fromio(adev->bios, bios, size); pci_unmap_rom(adev->pdev, bios); if (!check_atom_bios(adev->bios, size)) { kfree(adev->bios); return false; } return true; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher10377.44%250.00%
Ken Xue2418.05%125.00%
Evan Quan64.51%125.00%
Total133100.00%4100.00%


static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev) { u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0}; int len; if (!adev->asic_funcs->read_bios_from_rom) return false; /* validate VBIOS signature */ if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false) return false; header[AMD_VBIOS_SIGNATURE_END] = 0; if ((!AMD_IS_VALID_VBIOS(header)) || 0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET], AMD_VBIOS_SIGNATURE, strlen(AMD_VBIOS_SIGNATURE))) return false; /* valid vbios, go on */ len = AMD_VBIOS_LENGTH(header); len = ALIGN(len, 4); adev->bios = kmalloc(len, GFP_KERNEL); if (!adev->bios) { DRM_ERROR("no memory to allocate for BIOS\n"); return false; } adev->bios_size = len; /* read complete BIOS */ amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); if (!check_atom_bios(adev->bios, len)) { kfree(adev->bios); return false; } return true; }

Contributors

PersonTokensPropCommitsCommitProp
Monk Liu16182.99%133.33%
Ken Xue2713.92%133.33%
Evan Quan63.09%133.33%
Total194100.00%3100.00%


static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) { uint8_t __iomem *bios; size_t size; adev->bios = NULL; bios = pci_platform_rom(adev->pdev, &size); if (!bios) { return false; } adev->bios = kzalloc(size, GFP_KERNEL); if (adev->bios == NULL) return false; memcpy_fromio(adev->bios, bios, size); if (!check_atom_bios(adev->bios, size)) { kfree(adev->bios); return false; } adev->bios_size = size; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher7667.26%133.33%
Ken Xue3127.43%133.33%
Evan Quan65.31%133.33%
Total113100.00%3100.00%

#ifdef CONFIG_ACPI /* ATRM is used to get the BIOS on the discrete cards in * dual-gpu systems. */ /* retrieve the ROM in 4k blocks */ #define ATRM_BIOS_PAGE 4096 /** * amdgpu_atrm_call - fetch a chunk of the vbios * * @atrm_handle: acpi ATRM handle * @bios: vbios image pointer * @offset: offset of vbios image data to fetch * @len: length of vbios image data to fetch * * Executes ATRM to fetch a chunk of the discrete * vbios image on PX systems (all asics). * Returns the length of the buffer fetched. */
static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios, int offset, int len) { acpi_status status; union acpi_object atrm_arg_elements[2], *obj; struct acpi_object_list atrm_arg; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; atrm_arg.count = 2; atrm_arg.pointer = &atrm_arg_elements[0]; atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; atrm_arg_elements[0].integer.value = offset; atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; atrm_arg_elements[1].integer.value = len; status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); if (ACPI_FAILURE(status)) { printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); return -ENODEV; } obj = (union acpi_object *)buffer.pointer; memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length); len = obj->buffer.length; kfree(buffer.pointer); return len; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher188100.00%1100.00%
Total188100.00%1100.00%


static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) { int ret; int size = 256 * 1024; int i; struct pci_dev *pdev = NULL; acpi_handle dhandle, atrm_handle; acpi_status status; bool found = false; /* ATRM is for the discrete card only */ if (adev->flags & AMD_IS_APU) return false; while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { dhandle = ACPI_HANDLE(&pdev->dev); if (!dhandle) continue; status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); if (!ACPI_FAILURE(status)) { found = true; break; } } if (!found) { while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { dhandle = ACPI_HANDLE(&pdev->dev); if (!dhandle) continue; status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); if (!ACPI_FAILURE(status)) { found = true; break; } } } if (!found) return false; adev->bios = kmalloc(size, GFP_KERNEL); if (!adev->bios) { DRM_ERROR("Unable to allocate bios\n"); return false; } for (i = 0; i < size / ATRM_BIOS_PAGE; i++) { ret = amdgpu_atrm_call(atrm_handle, adev->bios, (i * ATRM_BIOS_PAGE), ATRM_BIOS_PAGE); if (ret < ATRM_BIOS_PAGE) break; } if (!check_atom_bios(adev->bios, size)) { kfree(adev->bios); return false; } adev->bios_size = size; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher28695.65%120.00%
Evan Quan62.01%120.00%
Ken Xue31.00%120.00%
Monk Liu31.00%120.00%
Jammy Zhou10.33%120.00%
Total299100.00%5100.00%

#else
static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher15100.00%1100.00%
Total15100.00%1100.00%

#endif
static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev) { if (adev->flags & AMD_IS_APU) return igp_read_bios_from_vram(adev); else return amdgpu_asic_read_disabled_bios(adev); }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher3196.88%150.00%
Jammy Zhou13.12%150.00%
Total32100.00%2100.00%

#ifdef CONFIG_ACPI
static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) { struct acpi_table_header *hdr; acpi_size tbl_size; UEFI_ACPI_VFCT *vfct; unsigned offset; if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr))) return false; tbl_size = hdr->length; if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); return false; } vfct = (UEFI_ACPI_VFCT *)hdr; offset = vfct->VBIOSImageOffset; while (offset < tbl_size) { GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset); VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader; offset += sizeof(VFCT_IMAGE_HEADER); if (offset > tbl_size) { DRM_ERROR("ACPI VFCT image header truncated\n"); return false; } offset += vhdr->ImageLength; if (offset > tbl_size) { DRM_ERROR("ACPI VFCT image truncated\n"); return false; } if (vhdr->ImageLength && vhdr->PCIBus == adev->pdev->bus->number && vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) && vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) && vhdr->VendorID == adev->pdev->vendor && vhdr->DeviceID == adev->pdev->device) { adev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL); if (!check_atom_bios(adev->bios, vhdr->ImageLength)) { kfree(adev->bios); return false; } adev->bios_size = vhdr->ImageLength; return true; } } DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher25286.01%240.00%
Ken Xue299.90%120.00%
Lv Zheng72.39%120.00%
Evan Quan51.71%120.00%
Total293100.00%5100.00%

#else
static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher15100.00%1100.00%
Total15100.00%1100.00%

#endif
bool amdgpu_get_bios(struct amdgpu_device *adev) { if (amdgpu_atrm_get_bios(adev)) return true; if (amdgpu_acpi_vfct_bios(adev)) return true; if (igp_read_bios_from_vram(adev)) return true; if (amdgpu_read_bios(adev)) return true; if (amdgpu_read_bios_from_rom(adev)) return true; if (amdgpu_read_disabled_bios(adev)) return true; if (amdgpu_read_platform_bios(adev)) return true; DRM_ERROR("Unable to locate a BIOS ROM\n"); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher5865.91%133.33%
Ken Xue2629.55%133.33%
Monk Liu44.55%133.33%
Total88100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Alex Deucher119166.35%330.00%
Ken Xue35920.00%110.00%
Monk Liu19811.03%110.00%
Evan Quan351.95%110.00%
Lv Zheng70.39%110.00%
Jammy Zhou30.17%110.00%
Ravikant B Sharma10.06%110.00%
jimqu10.06%110.00%
Total1795100.00%10100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.