[PATCH 4/4] drm/amdgpu: get hash bit for CH4 in umc channel index

[Tao Zhou]

On ALDEBARAN, the umc channel bits are not original values, they
are hashed.

Signed-off-by: Tao Zhou <tao.zhou1 at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/umc_v6_7.c |  8 ++++++++
 drivers/gpu/drm/amd/amdgpu/umc_v6_7.h | 15 +++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/umc_v6_7.c b/drivers/gpu/drm/amd/amdgpu/umc_v6_7.c
index 1ecba7b5df1c..47452b61b615 100644
--- a/drivers/gpu/drm/amd/amdgpu/umc_v6_7.c
+++ b/drivers/gpu/drm/amd/amdgpu/umc_v6_7.c
@@ -148,6 +148,10 @@ static void umc_v6_7_ecc_info_query_error_address(struct amdgpu_device *adev,
 		soc_pa = ADDR_OF_8KB_BLOCK(err_addr) |
 				ADDR_OF_256B_BLOCK(channel_index) |
 				OFFSET_IN_256B_BLOCK(err_addr);
+
+		/* The umc channel bits are not original values, they are hashed */
+		SET_CHANNEL_HASH(channel_index, soc_pa);
+
 		/* clear [C4 C3 C2] in soc physical address */
 		soc_pa &= ~(0x7ULL << UMC_V6_7_PA_C2_BIT);
 
@@ -379,6 +383,10 @@ static void umc_v6_7_query_error_address(struct amdgpu_device *adev,
 		soc_pa = ADDR_OF_8KB_BLOCK(err_addr) |
 				ADDR_OF_256B_BLOCK(channel_index) |
 				OFFSET_IN_256B_BLOCK(err_addr);
+
+		/* The umc channel bits are not original values, they are hashed */
+		SET_CHANNEL_HASH(channel_index, soc_pa);
+
 		/* clear [C4 C3 C2] in soc physical address */
 		soc_pa &= ~(0x7ULL << UMC_V6_7_PA_C2_BIT);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/umc_v6_7.h b/drivers/gpu/drm/amd/amdgpu/umc_v6_7.h
index b67677867b45..e50f7692bd03 100644
--- a/drivers/gpu/drm/amd/amdgpu/umc_v6_7.h
+++ b/drivers/gpu/drm/amd/amdgpu/umc_v6_7.h
@@ -45,12 +45,27 @@
 #define UMC_V6_7_NA_MAP_PA_NUM	8
 /* R14 bit shift should be considered, double the number */
 #define UMC_V6_7_BAD_PAGE_NUM_PER_CHANNEL	(UMC_V6_7_NA_MAP_PA_NUM * 2)
+/* The CH4 bit in SOC physical address */
+#define UMC_V6_7_PA_CH4_BIT	12
 /* The C2 bit in SOC physical address */
 #define UMC_V6_7_PA_C2_BIT	17
 /* The R14 bit in SOC physical address */
 #define UMC_V6_7_PA_R14_BIT	34
 /* UMC regiser per channel offset */
 #define UMC_V6_7_PER_CHANNEL_OFFSET		0x400
+
+/* XOR bit 20, 25, 34 of PA into CH4 bit (bit 12 of PA),
+ * hash bit is only effective when related setting is eanbled
+ */
+#define CHANNEL_HASH(channel_idx, pa) (((channel_idx) >> 4) ^ \
+			(((pa)  >> 20) & 0x1ULL & adev->df.hash_status.hash_64k) ^ \
+			(((pa)  >> 25) & 0x1ULL & adev->df.hash_status.hash_2m) ^ \
+			(((pa)  >> 34) & 0x1ULL & adev->df.hash_status.hash_1g))
+#define SET_CHANNEL_HASH(channel_idx, pa) do { \
+		(pa) &= ~(0x1ULL << UMC_V6_7_PA_CH4_BIT); \
+		(pa) |= (CHANNEL_HASH(channel_idx, pa) << UMC_V6_7_PA_CH4_BIT); \
+	} while (0)
+
 extern struct amdgpu_umc_ras umc_v6_7_ras;
 extern const uint32_t
 	umc_v6_7_channel_idx_tbl_second[UMC_V6_7_UMC_INSTANCE_NUM][UMC_V6_7_CHANNEL_INSTANCE_NUM];
-- 
2.17.1