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drm/amdgpu: Read discovery info from system memory

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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 <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Lijo Lazar
2023-01-30 09:38:09 +05:30
committed by Alex Deucher
parent 6e01882267
commit 368bb1bcfb
1 changed files with 23 additions and 0 deletions
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23
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
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@@ -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;