Commit 368bb1bc authored by Lijo Lazar's avatar Lijo Lazar Committed by Alex Deucher
Browse files

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: default avatarLijo Lazar <lijo.lazar@amd.com>
Reviewed-by: default avatarHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 6e018822

drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c

+23 −0
Original line number Diff line number Diff line
@@ -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;