<div dir="auto">Hi Ken, a comment below<div> <div class="gmail_extra"> <div class="gmail_quote">Den 21 dec. 2016 08:19 skrev "Xue, Ken" <<a href="mailto:Ken.Xue@amd.com">Ken.Xue@amd.com</a>>: <blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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 <<a href="mailto:Ken.Xue@amd.com">Ken.Xue@amd.com</a>> --- drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c | 174 ++++++++++++++++------------- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 +- 2 files changed, 102 insertions(+), 80 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c index 4f973a9..a6fa91f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c @@ -42,6 +42,44 @@ #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 (!memcmp(bios + tmp, "ATOM", 4) || + !memcmp(bios + tmp, "MOTA", 4) || + (size < tmp)) </blockquote></div></div></div><div dir="auto"> </div><div dir="auto">Is the last condition here correct? Can you have valid atombios without the signature? Maybe add a comment if that's true. Also the extra parents aren't necessary.</div><div dir="auto"> </div><div dir="auto">Best regards</div><div dir="auto">Nils</div><div dir="auto"> </div><div dir="auto"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> + 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 +103,6 @@ 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 +111,18 @@ 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 +132,6 @@ 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 +140,12 @@ 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 +179,14 @@ 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 +201,17 @@ static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) return false; } - if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) { + adev->bios = kzalloc(size, GFP_KERNEL); + if (adev->bios == NULL) return false; - } - adev->bios = kmemdup(bios, size, GFP_KERNEL); - if (adev->bios == NULL) { + + 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 +323,7 @@ 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 +348,6 @@ 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; @@ -309,13 +358,13 @@ static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) return false; 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); @@ -330,20 +379,25 @@ 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 = 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; - ret = !!adev->bios; -out_unmap: - return ret; + return true; } #else static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) @@ -354,57 +408,27 @@ 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; - } - tmp = bios_header_start + 4; - if (!memcmp(adev->bios + tmp, "ATOM", 4) || - !memcmp(adev->bios + tmp, "MOTA", 4)) { - adev->is_atom_bios = true; - } else { - adev->is_atom_bios = false; - } + if (amdgpu_read_bios(adev)) + return true; - DRM_DEBUG("%sBIOS detected\n", adev->is_atom_bios ? "ATOM" : "COM"); - return true; -free_bios: - kfree(adev->bios); - adev->bios = NULL; + 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; } diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index b7f17c2..e23acbe 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -1753,15 +1753,13 @@ int amdgpu_device_init(struct amdgpu_device *adev, /* Read BIOS */ if (!amdgpu_get_bios(adev)) { + /* Must be an ATOMBIOS */ r = -EINVAL; - goto failed; - } - /* Must be an ATOMBIOS */ - if (!adev->is_atom_bios) { dev_err(adev->dev, "Expecting atombios for GPU\n"); - r = -EINVAL; goto failed; } + adev->is_atom_bios = true; + r = amdgpu_atombios_init(adev); if (r) { dev_err(adev->dev, "amdgpu_atombios_init failed\n"); -- 2.7.4 _______________________________________________ amd-gfx mailing list <a href="mailto:amd-gfx@lists.freedesktop.org">amd-gfx@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/amd-gfx" rel="noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/amd-gfx</a> </blockquote></div> </div></div></div>