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drm/amdgpu: Refine the way to get atom bios

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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 <Ken.Xue@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ken Xue 2016-12-21 18:35:28 +08:00 committed by Alex Deucher
parent 33503e9e5a
commit 919db4c199
1 changed files with 107 additions and 76 deletions
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183
drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
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@ -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;
}