From: Lijo Lazar <lijo.lazar@xxxxxxx>
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@xxxxxxx>
Reviewed-by: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
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;
--
2.40.1
