[PATCH 1/7] drm/amdgpu: Add option to refresh NPS data

[Lijo Lazar <lijo.lazar@xxxxxxx>]

In certain use cases, NPS data needs to be refreshed again from
discovery table. Add API parameter to refresh NPS data from discovery
table.

Signed-off-by: Lijo Lazar <lijo.lazar@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 68 +++++++++++++++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.h |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c       |  2 +-
 3 files changed, 55 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index 4bd61c169ca8..9f9a1867da72 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -1723,37 +1723,75 @@ union nps_info {
 	struct nps_info_v1_0 v1;
 };
 
+static int amdgpu_discovery_refresh_nps_info(struct amdgpu_device *adev,
+					     union nps_info *nps_data)
+{
+	uint64_t vram_size, pos, offset;
+	struct nps_info_header *nhdr;
+	struct binary_header bhdr;
+	uint16_t checksum;
+
+	vram_size = (uint64_t)RREG32(mmRCC_CONFIG_MEMSIZE) << 20;
+	pos = vram_size - DISCOVERY_TMR_OFFSET;
+	amdgpu_device_vram_access(adev, pos, &bhdr, sizeof(bhdr), false);
+
+	offset = le16_to_cpu(bhdr.table_list[NPS_INFO].offset);
+	checksum = le16_to_cpu(bhdr.table_list[NPS_INFO].checksum);
+
+	amdgpu_device_vram_access(adev, (pos + offset), nps_data,
+				  sizeof(*nps_data), false);
+
+	nhdr = (struct nps_info_header *)(nps_data);
+	if (!amdgpu_discovery_verify_checksum((uint8_t *)nps_data,
+					      le32_to_cpu(nhdr->size_bytes),
+					      checksum)) {
+		dev_err(adev->dev, "nps data refresh, checksum mismatch\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 int amdgpu_discovery_get_nps_info(struct amdgpu_device *adev,
 				  uint32_t *nps_type,
 				  struct amdgpu_gmc_memrange **ranges,
-				  int *range_cnt)
+				  int *range_cnt, bool refresh)
 {
 	struct amdgpu_gmc_memrange *mem_ranges;
 	struct binary_header *bhdr;
 	union nps_info *nps_info;
+	union nps_info nps_data;
 	u16 offset;
-	int i;
+	int i, r;
 
 	if (!nps_type || !range_cnt || !ranges)
 		return -EINVAL;
 
-	if (!adev->mman.discovery_bin) {
-		dev_err(adev->dev,
-			"fetch mem range failed, ip discovery uninitialized\n");
-		return -EINVAL;
-	}
+	if (refresh) {
+		r = amdgpu_discovery_refresh_nps_info(adev, &nps_data);
+		if (r)
+			return r;
+		nps_info = &nps_data;
+	} else {
+		if (!adev->mman.discovery_bin) {
+			dev_err(adev->dev,
+				"fetch mem range failed, ip discovery uninitialized\n");
+			return -EINVAL;
+		}
 
-	bhdr = (struct binary_header *)adev->mman.discovery_bin;
-	offset = le16_to_cpu(bhdr->table_list[NPS_INFO].offset);
+		bhdr = (struct binary_header *)adev->mman.discovery_bin;
+		offset = le16_to_cpu(bhdr->table_list[NPS_INFO].offset);
 
-	if (!offset)
-		return -ENOENT;
+		if (!offset)
+			return -ENOENT;
 
-	/* If verification fails, return as if NPS table doesn't exist */
-	if (amdgpu_discovery_verify_npsinfo(adev, bhdr))
-		return -ENOENT;
+		/* If verification fails, return as if NPS table doesn't exist */
+		if (amdgpu_discovery_verify_npsinfo(adev, bhdr))
+			return -ENOENT;
 
-	nps_info = (union nps_info *)(adev->mman.discovery_bin + offset);
+		nps_info =
+			(union nps_info *)(adev->mman.discovery_bin + offset);
+	}
 
 	switch (le16_to_cpu(nps_info->v1.header.version_major)) {
 	case 1:
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.h
index f5d36525ec3e..b44d56465c5b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.h
@@ -33,6 +33,6 @@ int amdgpu_discovery_set_ip_blocks(struct amdgpu_device *adev);
 int amdgpu_discovery_get_nps_info(struct amdgpu_device *adev,
 				  uint32_t *nps_type,
 				  struct amdgpu_gmc_memrange **ranges,
-				  int *range_cnt);
+				  int *range_cnt, bool refresh);
 
 #endif /* __AMDGPU_DISCOVERY__ */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 17a19d49d30a..4f088a5368d8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -1184,7 +1184,7 @@ int amdgpu_gmc_get_nps_memranges(struct amdgpu_device *adev,
 		return -EINVAL;
 
 	ret = amdgpu_discovery_get_nps_info(adev, &nps_type, &ranges,
-					    &range_cnt);
+					    &range_cnt, false);
 
 	if (ret)
 		return ret;
-- 
2.25.1