diff options
| author | Lijo Lazar <[email protected]> | 2023-01-30 09:38:09 +0530 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2023-06-09 09:55:42 -0400 |
| commit | 368bb1bcfb3a3bc70793cd347abe0bc60c01d94b (patch) | |
| tree | 521b6904f1b9152bbba175ec4972b5bf3a1c1df6 | |
| parent | 6e01882267a696b022cfe3473a0d3e5ccbe54010 (diff) | |
drm/amdgpu: Read discovery info from system memory
On certain ASICs, discovery info is available at reserved region in system
memory. The location is available through ACPI interface. Add API to read
discovery info from there.
Signed-off-by: Lijo Lazar <[email protected]>
Reviewed-by: Hawking Zhang <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c index 6701f17a4db6..246070938c41 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c @@ -203,6 +203,29 @@ static int hw_id_map[MAX_HWIP] = { [PCIE_HWIP] = PCIE_HWID, }; +static int amdgpu_discovery_read_binary_from_sysmem(struct amdgpu_device *adev, uint8_t *binary) +{ + u64 tmr_offset, tmr_size, pos; + void *discv_regn; + int ret; + + ret = amdgpu_acpi_get_tmr_info(adev, &tmr_offset, &tmr_size); + if (ret) + return ret; + + pos = tmr_offset + tmr_size - DISCOVERY_TMR_OFFSET; + + /* This region is read-only and reserved from system use */ + discv_regn = memremap(pos, adev->mman.discovery_tmr_size, MEMREMAP_WC); + if (discv_regn) { + memcpy(binary, discv_regn, adev->mman.discovery_tmr_size); + memunmap(discv_regn); + return 0; + } + + return -ENOENT; +} + static void amdgpu_discovery_read_binary_from_vram(struct amdgpu_device *adev, uint8_t *binary) { uint64_t vram_size = (uint64_t)RREG32(mmRCC_CONFIG_MEMSIZE) << 20; |