drm/amdgpu/gmc9: Adjust GART and AGP location with xgmi offset (v2)

On hives with xgmi enabled, the fb_location aperture is a size
which defines the total framebuffer size of all nodes in the
hive.  Each GPU in the hive has the same view via the fb_location
aperture.  GPU0 starts at offset (0 * segment size),
GPU1 starts at offset (1 * segment size), etc.

For access to local vram on each GPU, we need to take this offset into
account. This including on setting up GPUVM page table and GART table

v2: squash in "drm/amdgpu: Init correct fb region for none XGMI configuration"

Acked-by: Huang Rui <ray.huang@amd.com>
Acked-by: Slava Abramov <slava.abramov@amd.com>
Signed-off-by: Shaoyun Liu <Shaoyun.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>

5 files changed, 39 insertions, 10 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 6acdeebabfc0..ae4467113240 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -121,6 +121,11 @@ void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
         mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
         if (limit && limit < mc->real_vram_size)
                 mc->real_vram_size = limit;
+
+        if (mc->xgmi.num_physical_nodes == 0) {
+                mc->fb_start = mc->vram_start;
+                mc->fb_end = mc->vram_end;
+        }
         dev_info(adev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
                         mc->mc_vram_size >> 20, mc->vram_start,
                         mc->vram_end, mc->real_vram_size >> 20);
@@ -147,8 +152,8 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
         /* VCE doesn't like it when BOs cross a 4GB segment, so align
          * the GART base on a 4GB boundary as well.
          */
-        size_bf = mc->vram_start;
-        size_af = adev->gmc.mc_mask + 1 - ALIGN(mc->vram_end + 1, four_gb);
+        size_bf = mc->fb_start;
+        size_af = adev->gmc.mc_mask + 1 - ALIGN(mc->fb_end + 1, four_gb);
 
         if (mc->gart_size > max(size_bf, size_af)) {
                 dev_warn(adev->dev, "limiting GART\n");
@@ -184,23 +189,23 @@ void amdgpu_gmc_agp_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
         const uint64_t sixteen_gb_mask = ~(sixteen_gb - 1);
         u64 size_af, size_bf;
 
-        if (mc->vram_start > mc->gart_start) {
-                size_bf = (mc->vram_start & sixteen_gb_mask) -
+        if (mc->fb_start > mc->gart_start) {
+                size_bf = (mc->fb_start & sixteen_gb_mask) -
                         ALIGN(mc->gart_end + 1, sixteen_gb);
-                size_af = mc->mc_mask + 1 - ALIGN(mc->vram_end + 1, sixteen_gb);
+                size_af = mc->mc_mask + 1 - ALIGN(mc->fb_end + 1, sixteen_gb);
         } else {
-                size_bf = mc->vram_start & sixteen_gb_mask;
+                size_bf = mc->fb_start & sixteen_gb_mask;
                 size_af = (mc->gart_start & sixteen_gb_mask) -
-                        ALIGN(mc->vram_end + 1, sixteen_gb);
+                        ALIGN(mc->fb_end + 1, sixteen_gb);
         }
 
         if (size_bf > size_af) {
-                mc->agp_start = mc->vram_start > mc->gart_start ?
+                mc->agp_start = mc->fb_start > mc->gart_start ?
                         mc->gart_end + 1 : 0;
                 mc->agp_size = size_bf;
         } else {
-                mc->agp_start = (mc->vram_start > mc->gart_start ?
-                        mc->vram_end : mc->gart_end) + 1,
+                mc->agp_start = (mc->fb_start > mc->gart_start ?
+                        mc->fb_end : mc->gart_end) + 1,
                 mc->agp_size = size_af;
         }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index a929a55b30c2..b00b5165969b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -114,6 +114,14 @@ struct amdgpu_gmc {
         u64                     gart_end;
         u64                     vram_start;
         u64                     vram_end;
+        /* FB region , it's same as local vram region in single GPU, in XGMI
+         * configuration, this region covers all GPUs in the same hive ,
+         * each GPU in the hive has the same view of this FB region .
+         * GPU0's vram starts at offset (0 * segment size) ,
+         * GPU1 starts at offset (1 * segment size), etc.
+         */
+        u64                     fb_start;
+        u64                     fb_end;
         unsigned                vram_width;
         u64                     real_vram_size;
         int                     vram_mtrr;
diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_1.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_1.c
index d4170cb41055..5e9ab8eb214a 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_1.c
@@ -44,6 +44,9 @@ int gfxhub_v1_1_get_xgmi_info(struct amdgpu_device *adev)
                         REG_GET_FIELD(xgmi_lfb_cntl, MC_VM_XGMI_LFB_CNTL, PF_LFB_REGION);
                 if (adev->gmc.xgmi.physical_node_id > 3)
                         return -EINVAL;
+                adev->gmc.xgmi.node_segment_size = REG_GET_FIELD(
+                        RREG32_SOC15(GC, 0, mmMC_VM_XGMI_LFB_SIZE),
+                        MC_VM_XGMI_LFB_SIZE, PF_LFB_SIZE) << 24;
         }
 
         return 0;
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index e9b5a1300657..b1c848937e42 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -771,12 +771,18 @@ static void gmc_v9_0_vram_gtt_location(struct amdgpu_device *adev,
         u64 base = 0;
         if (!amdgpu_sriov_vf(adev))
                 base = mmhub_v1_0_get_fb_location(adev);
+        /* add the xgmi offset of the physical node */
+        base += adev->gmc.xgmi.physical_node_id * adev->gmc.xgmi.node_segment_size;
         amdgpu_gmc_vram_location(adev, &adev->gmc, base);
         amdgpu_gmc_gart_location(adev, mc);
         if (!amdgpu_sriov_vf(adev))
                 amdgpu_gmc_agp_location(adev, mc);
         /* base offset of vram pages */
         adev->vm_manager.vram_base_offset = gfxhub_v1_0_get_mc_fb_offset(adev);
+
+        /* XXX: add the xgmi offset of the physical node? */
+        adev->vm_manager.vram_base_offset +=
+                adev->gmc.xgmi.physical_node_id * adev->gmc.xgmi.node_segment_size;
 }
 
 /**
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
index 73d7c075dd33..0e09549d1db8 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
@@ -38,10 +38,17 @@
 u64 mmhub_v1_0_get_fb_location(struct amdgpu_device *adev)
 {
         u64 base = RREG32_SOC15(MMHUB, 0, mmMC_VM_FB_LOCATION_BASE);
+        u64 top = RREG32_SOC15(MMHUB, 0, mmMC_VM_FB_LOCATION_TOP);
 
         base &= MC_VM_FB_LOCATION_BASE__FB_BASE_MASK;
         base <<= 24;
 
+        top &= MC_VM_FB_LOCATION_TOP__FB_TOP_MASK;
+        top <<= 24;
+
+        adev->gmc.fb_start = base;
+        adev->gmc.fb_end = top;
+
         return base;
 }