drm/amdgpu: add gpu harvest support for yellow carp (v2)

Register callback in gfxhub functions to program the bypass groups in
gc_utcl2 corresponding to harvested SA.

v2: update comments (Alex)
Signed-off-by: Xiaomeng Hou <Xiaomeng.Hou@amd.com>
Signed-off-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gfxhub.h

@@ -34,6 +34,7 @@ struct amdgpu_gfxhub_funcs {
 	void (*set_fault_enable_default)(struct amdgpu_device *adev, bool value);
 	void (*init)(struct amdgpu_device *adev);
 	int (*get_xgmi_info)(struct amdgpu_device *adev);
+	void (*utcl2_harvest)(struct amdgpu_device *adev);
 };
 
 struct amdgpu_gfxhub {

drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c

@@ -31,6 +31,9 @@
 
 #include "soc15_common.h"
 
+#define mmGCUTCL2_HARVEST_BYPASS_GROUPS_YELLOW_CARP				0x16f8
+#define mmGCUTCL2_HARVEST_BYPASS_GROUPS_YELLOW_CARP_BASE_IDX	0
+
 static const char *gfxhub_client_ids[] = {
 	"CB/DB",
 	"Reserved",
@@ -531,6 +534,42 @@ static int gfxhub_v2_1_get_xgmi_info(struct amdgpu_device *adev)
 	return 0;
 }
 
+static void gfxhub_v2_1_utcl2_harvest(struct amdgpu_device *adev)
+{
+	int i;
+	u32 tmp = 0, disabled_sa = 0;
+	u32 efuse_setting, vbios_setting;
+
+	u32 max_sa_mask = amdgpu_gfx_create_bitmask(
+		adev->gfx.config.max_sh_per_se *
+		adev->gfx.config.max_shader_engines);
+
+	if (adev->asic_type == CHIP_YELLOW_CARP) {
+		/* Get SA disabled bitmap from eFuse setting */
+		efuse_setting = RREG32_SOC15(GC, 0, mmCC_GC_SA_UNIT_DISABLE);
+		efuse_setting &= CC_GC_SA_UNIT_DISABLE__SA_DISABLE_MASK;
+		efuse_setting >>= CC_GC_SA_UNIT_DISABLE__SA_DISABLE__SHIFT;
+
+		/* Get SA disabled bitmap from VBIOS setting */
+		vbios_setting = RREG32_SOC15(GC, 0, mmGC_USER_SA_UNIT_DISABLE);
+		vbios_setting &= GC_USER_SA_UNIT_DISABLE__SA_DISABLE_MASK;
+		vbios_setting >>= GC_USER_SA_UNIT_DISABLE__SA_DISABLE__SHIFT;
+
+		disabled_sa |= efuse_setting | vbios_setting;
+		/* Make sure not to report harvested SAs beyond the max SA count */
+		disabled_sa &= max_sa_mask;
+
+		for (i = 0; disabled_sa > 0; i++) {
+			if (disabled_sa & 1)
+				tmp |= 0x3 << (i * 2);
+			disabled_sa >>= 1;
+		}
+		disabled_sa = tmp;
+
+		WREG32_SOC15(GC, 0, mmGCUTCL2_HARVEST_BYPASS_GROUPS_YELLOW_CARP, disabled_sa);
+	}
+}
+
 const struct amdgpu_gfxhub_funcs gfxhub_v2_1_funcs = {
 	.get_fb_location = gfxhub_v2_1_get_fb_location,
 	.get_mc_fb_offset = gfxhub_v2_1_get_mc_fb_offset,
@@ -540,4 +579,5 @@ const struct amdgpu_gfxhub_funcs gfxhub_v2_1_funcs = {
 	.set_fault_enable_default = gfxhub_v2_1_set_fault_enable_default,
 	.init = gfxhub_v2_1_init,
 	.get_xgmi_info = gfxhub_v2_1_get_xgmi_info,
+	.utcl2_harvest = gfxhub_v2_1_utcl2_harvest,
 };

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -1059,6 +1059,13 @@ static int gmc_v10_0_hw_init(void *handle)
 	/* The sequence of these two function calls matters.*/
 	gmc_v10_0_init_golden_registers(adev);
 
+	/*
+	 * harvestable groups in gc_utcl2 need to be programmed before any GFX block
+	 * register setup within GMC, or else system hang when harvesting SA.
+	 */
+	if (adev->gfxhub.funcs && adev->gfxhub.funcs->utcl2_harvest)
+		adev->gfxhub.funcs->utcl2_harvest(adev);
+
 	r = gmc_v10_0_gart_enable(adev);
 	if (r)
 		return r;