From 919db4c199127781cef99b7ea0b74e3a9572ea32 Mon Sep 17 00:00:00 2001 From: Ken Xue Date: Wed, 21 Dec 2016 18:35:28 +0800 Subject: [PATCH] drm/amdgpu: Refine the way to get atom bios There are several ways to check out a ATOMBIOS. In previous codes, try a new way to fetch out vbios/rom, until current vbios/rom is started with 0x55aa, then check if this vbios is ATOMBIOS. Now, try a new way to fetch out vbios until all flags of ATOMBIOS are verified. Signed-off-by: Ken Xue Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c | 183 +++++++++++++---------- 1 file changed, 107 insertions(+), 76 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c index f573a953b4c3..2602ea12971e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c @@ -42,6 +42,51 @@ #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; +} + + /* 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 @@ -65,10 +110,6 @@ static bool igp_read_bios_from_vram(struct amdgpu_device *adev) return false; } - if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) { - iounmap(bios); - return false; - } adev->bios = kmalloc(size, GFP_KERNEL); if (!adev->bios) { iounmap(bios); @@ -77,12 +118,18 @@ static bool igp_read_bios_from_vram(struct amdgpu_device *adev) 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; } bool amdgpu_read_bios(struct amdgpu_device *adev) { - uint8_t __iomem *bios, val[2]; + uint8_t __iomem *bios; size_t size; adev->bios = NULL; @@ -92,13 +139,6 @@ bool amdgpu_read_bios(struct amdgpu_device *adev) return false; } - val[0] = readb(&bios[0]); - val[1] = readb(&bios[1]); - - if (size == 0 || !AMD_IS_VALID_VBIOS(val)) { - pci_unmap_rom(adev->pdev, bios); - return false; - } adev->bios = kzalloc(size, GFP_KERNEL); if (adev->bios == NULL) { pci_unmap_rom(adev->pdev, bios); @@ -107,6 +147,12 @@ bool amdgpu_read_bios(struct amdgpu_device *adev) 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; } @@ -140,7 +186,14 @@ static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev) adev->bios_size = len; /* read complete BIOS */ - return amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); + amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); + + if (!check_atom_bios(adev->bios, len)) { + kfree(adev->bios); + return false; + } + + return true; } static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) @@ -155,13 +208,17 @@ static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) return false; } - if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) { - return false; - } - adev->bios = kmemdup(bios, size, GFP_KERNEL); - if (adev->bios == NULL) { + 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; @@ -273,7 +330,7 @@ static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) break; } - if (i == 0 || !AMD_IS_VALID_VBIOS(adev->bios)) { + if (!check_atom_bios(adev->bios, size)) { kfree(adev->bios); return false; } @@ -298,7 +355,6 @@ static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev) #ifdef CONFIG_ACPI static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) { - bool ret = false; struct acpi_table_header *hdr; acpi_size tbl_size; UEFI_ACPI_VFCT *vfct; @@ -310,13 +366,13 @@ static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) tbl_size = hdr->length; if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); - goto out_unmap; + return false; } vfct = (UEFI_ACPI_VFCT *)hdr; if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) { DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); - goto out_unmap; + return false; } vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset); @@ -331,20 +387,25 @@ static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) vhdr->VendorID != adev->pdev->vendor || vhdr->DeviceID != adev->pdev->device) { DRM_INFO("ACPI VFCT table is not for this card\n"); - goto out_unmap; + return false; } if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) { DRM_ERROR("ACPI VFCT image truncated\n"); - goto out_unmap; + return false; } - adev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL); - adev->bios_size = vhdr->ImageLength; - ret = !!adev->bios; + adev->bios = kmemdup(&vbios->VbiosContent, + vhdr->ImageLength, + GFP_KERNEL); -out_unmap: - return ret; + if (!check_atom_bios(adev->bios, vhdr->ImageLength)) { + kfree(adev->bios); + return false; + } + adev->bios_size = vhdr->ImageLength; + + return true; } #else static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) @@ -355,57 +416,27 @@ static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) bool amdgpu_get_bios(struct amdgpu_device *adev) { - bool r; - uint16_t tmp, bios_header_start; + if (amdgpu_atrm_get_bios(adev)) + return true; - r = amdgpu_atrm_get_bios(adev); - if (!r) - r = amdgpu_acpi_vfct_bios(adev); - if (!r) - r = igp_read_bios_from_vram(adev); - if (!r) - r = amdgpu_read_bios(adev); - if (!r) { - r = amdgpu_read_bios_from_rom(adev); - } - if (!r) { - r = amdgpu_read_disabled_bios(adev); - } - if (!r) { - r = amdgpu_read_platform_bios(adev); - } - if (!r || adev->bios == NULL) { - DRM_ERROR("Unable to locate a BIOS ROM\n"); - adev->bios = NULL; - return false; - } - if (!AMD_IS_VALID_VBIOS(adev->bios)) { - printk("BIOS signature incorrect %x %x\n", adev->bios[0], adev->bios[1]); - goto free_bios; - } + if (amdgpu_acpi_vfct_bios(adev)) + return true; - tmp = RBIOS16(0x18); - if (RBIOS8(tmp + 0x14) != 0x0) { - DRM_INFO("Not an x86 BIOS ROM, not using.\n"); - goto free_bios; - } + if (igp_read_bios_from_vram(adev)) + return true; - bios_header_start = RBIOS16(0x48); - if (!bios_header_start) { - goto free_bios; - } + if (amdgpu_read_bios(adev)) + return true; - /* Must be an ATOMBIOS */ - tmp = bios_header_start + 4; - if (memcmp(adev->bios + tmp, "ATOM", 4) && - memcmp(adev->bios + tmp, "MOTA", 4)) { - goto free_bios; - } + if (amdgpu_read_bios_from_rom(adev)) + return true; - DRM_DEBUG("ATOMBIOS detected\n"); - return true; -free_bios: - kfree(adev->bios); - adev->bios = NULL; + 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; }