drm/amdgpu/soc15: return cached values for some registers (v2)

Required for SR-IOV and saves MMIO transactions.

v2: drop cached RB harvest registers

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index 06664ee..c839994 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -322,6 +322,22 @@ static uint32_t soc15_read_indexed_register(struct amdgpu_device *adev, u32 se_n
        return val;
 }
 
+static uint32_t soc15_get_register_value(struct amdgpu_device *adev,
+                                        bool indexed, u32 se_num,
+                                        u32 sh_num, u32 reg_offset)
+{
+       if (indexed) {
+               return soc15_read_indexed_register(adev, se_num, sh_num, reg_offset);
+       } else {
+               switch (reg_offset) {
+               case SOC15_REG_OFFSET(GC, 0, mmGB_ADDR_CONFIG):
+                       return adev->gfx.config.gb_addr_config;
+               default:
+                       return RREG32(reg_offset);
+               }
+       }
+}
+
 static int soc15_read_register(struct amdgpu_device *adev, u32 se_num,
                            u32 sh_num, u32 reg_offset, u32 *value)
 {
@@ -345,10 +361,9 @@ static int soc15_read_register(struct amdgpu_device *adev, u32 se_num,
                        if (reg_offset != asic_register_entry->reg_offset)
                                continue;
                        if (!asic_register_entry->untouched)
-                               *value = asic_register_entry->grbm_indexed ?
-                                       soc15_read_indexed_register(adev, se_num,
-                                                                sh_num, reg_offset) :
-                                       RREG32(reg_offset);
+                               *value = soc15_get_register_value(adev,
+                                                                 asic_register_entry->grbm_indexed,
+                                                                 se_num, sh_num, reg_offset);
                        return 0;
                }
        }
@@ -358,10 +373,9 @@ static int soc15_read_register(struct amdgpu_device *adev, u32 se_num,
                        continue;
 
                if (!soc15_allowed_read_registers[i].untouched)
-                       *value = soc15_allowed_read_registers[i].grbm_indexed ?
-                               soc15_read_indexed_register(adev, se_num,
-                                                        sh_num, reg_offset) :
-                               RREG32(reg_offset);
+                       *value = soc15_get_register_value(adev,
+                                                         soc15_allowed_read_registers[i].grbm_indexed,
+                                                         se_num, sh_num, reg_offset);
                return 0;
        }
        return -EINVAL;