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drm/amdgpu: Implement get_xgmi_info callback for mmhub_v4_2

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Query memory region assignment and address via mmhub

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Hawking Zhang 2026-01-17 20:25:36 +08:00 committed by Alex Deucher
parent 5aff5c6831
commit 20fe5d020f
2 changed files with 41 additions and 0 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu_mmhub.h
View File

@ -63,6 +63,7 @@ struct amdgpu_mmhub_funcs {
uint64_t page_table_base);
void (*update_power_gating)(struct amdgpu_device *adev,
bool enable);
int (*get_xgmi_info)(struct amdgpu_device *adev);
};
struct amdgpu_mmhub {

40
drivers/gpu/drm/amd/amdgpu/mmhub_v4_2_0.c
View File

@ -72,6 +72,45 @@ static const char *mmhub_client_ids_v4_2_0[][2] = {
[23][1] = "VCN1",
};
static int mmhub_v4_2_0_get_xgmi_info(struct amdgpu_device *adev)
{
u32 max_num_physical_nodes;
u32 max_physical_node_id;
u32 xgmi_lfb_cntl;
u32 max_region;
u64 seg_size;
/* limit this callback to A + A configuration only */
if (!adev->gmc.xgmi.connected_to_cpu)
return 0;
xgmi_lfb_cntl = RREG32_SOC15(MMHUB, GET_INST(MMHUB, 0),
regMMMC_VM_XGMI_LFB_CNTL);
seg_size = REG_GET_FIELD(
RREG32_SOC15(MMHUB, GET_INST(MMHUB, 0), regMMMC_VM_XGMI_LFB_SIZE),
MMMC_VM_XGMI_LFB_SIZE, PF_LFB_SIZE) << 24;
max_region =
REG_GET_FIELD(xgmi_lfb_cntl, MMMC_VM_XGMI_LFB_CNTL, PF_MAX_REGION);
max_num_physical_nodes = 4;
max_physical_node_id = 3;
adev->gmc.xgmi.num_physical_nodes = max_region + 1;
if (adev->gmc.xgmi.num_physical_nodes > max_num_physical_nodes)
return -EINVAL;
adev->gmc.xgmi.physical_node_id =
REG_GET_FIELD(xgmi_lfb_cntl, MMMC_VM_XGMI_LFB_CNTL, PF_LFB_REGION);
if (adev->gmc.xgmi.physical_node_id > max_physical_node_id)
return -EINVAL;
adev->gmc.xgmi.node_segment_size = seg_size;
return 0;
}
static u64 mmhub_v4_2_0_get_fb_location(struct amdgpu_device *adev)
{
u64 base;
@ -884,6 +923,7 @@ const struct amdgpu_mmhub_funcs mmhub_v4_2_0_funcs = {
.set_fault_enable_default = mmhub_v4_2_0_set_fault_enable_default,
.set_clockgating = mmhub_v4_2_0_set_clockgating,
.get_clockgating = mmhub_v4_2_0_get_clockgating,
.get_xgmi_info = mmhub_v4_2_0_get_xgmi_info,
};
static int mmhub_v4_2_0_xcp_resume(void *handle, uint32_t inst_mask)