[PATCH V2] amdgpu/drm: Refine the way to check
Nils Wallménius
nils.wallmenius at gmail.com
Wed Dec 21 09:44:58 UTC 2016
Hi Ken, a comment below
Den 21 dec. 2016 08:19 skrev "Xue, Ken" <Ken.Xue at amd.com>:
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 at amd.com>
---
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))
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.
Best regards
Nils
+ 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
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