drm/amdgpu: add disable_cu parameter

This parameter will allow disabling individual CUs on module load, e.g.
amdgpu.disable_cu=2.0.3,2.0.4 to disable CUs 3 and 4 of SE2.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index 9f95da4f0536..a074edd95c70 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -70,3 +70,47 @@ void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg)
                 }
         }
 }
+
+/**
+ * amdgpu_gfx_parse_disable_cu - Parse the disable_cu module parameter
+ *
+ * @mask: array in which the per-shader array disable masks will be stored
+ * @max_se: number of SEs
+ * @max_sh: number of SHs
+ *
+ * The bitmask of CUs to be disabled in the shader array determined by se and
+ * sh is stored in mask[se * max_sh + sh].
+ */
+void amdgpu_gfx_parse_disable_cu(unsigned *mask, unsigned max_se, unsigned max_sh)
+{
+        unsigned se, sh, cu;
+        const char *p;
+
+        memset(mask, 0, sizeof(*mask) * max_se * max_sh);
+
+        if (!amdgpu_disable_cu || !*amdgpu_disable_cu)
+                return;
+
+        p = amdgpu_disable_cu;
+        for (;;) {
+                char *next;
+                int ret = sscanf(p, "%u.%u.%u", &se, &sh, &cu);
+                if (ret < 3) {
+                        DRM_ERROR("amdgpu: could not parse disable_cu\n");
+                        return;
+                }
+
+                if (se < max_se && sh < max_sh && cu < 16) {
+                        DRM_INFO("amdgpu: disabling CU %u.%u.%u\n", se, sh, cu);
+                        mask[se * max_sh + sh] |= 1u << cu;
+                } else {
+                        DRM_ERROR("amdgpu: disable_cu %u.%u.%u is out of range\n",
+                                  se, sh, cu);
+                }
+
+                next = strchr(p, ',');
+                if (!next)
+                        break;
+                p = next + 1;
+        }
+}