drm/amdkfd: ratelimited svm debug messages

No function change, use pr_debug_ratelimited to avoid per page debug
message overflowing dmesg buf and console log.

use dev_err to show error message from unexpected situation, to provide
clue to help debug without enabling dynamic debug log. Define dev_fmt to
output function name in error message.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

@@ -20,7 +20,6 @@
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  */
-
 #include <linux/types.h>
 #include <linux/hmm.h>
 #include <linux/dma-direction.h>
@@ -34,6 +33,11 @@
 #include "kfd_svm.h"
 #include "kfd_migrate.h"
 
+#ifdef dev_fmt
+#undef dev_fmt
+#endif
+#define dev_fmt(fmt) "kfd_migrate: %s: " fmt, __func__
+
 static uint64_t
 svm_migrate_direct_mapping_addr(struct amdgpu_device *adev, uint64_t addr)
 {
@@ -151,14 +155,14 @@ svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys,
 			gart_d = svm_migrate_direct_mapping_addr(adev, *vram);
 		}
 		if (r) {
-			pr_debug("failed %d to create gart mapping\n", r);
+			dev_err(adev->dev, "fail %d create gart mapping\n", r);
 			goto out_unlock;
 		}
 
 		r = amdgpu_copy_buffer(ring, gart_s, gart_d, size * PAGE_SIZE,
 				       NULL, &next, false, true, false);
 		if (r) {
-			pr_debug("failed %d to copy memory\n", r);
+			dev_err(adev->dev, "fail %d to copy memory\n", r);
 			goto out_unlock;
 		}
 
@@ -285,7 +289,7 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 
 	r = svm_range_vram_node_new(adev, prange, true);
 	if (r) {
-		pr_debug("failed %d get 0x%llx pages from vram\n", r, npages);
+		dev_err(adev->dev, "fail %d to alloc vram\n", r);
 		goto out;
 	}
 
@@ -305,7 +309,7 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 					      DMA_TO_DEVICE);
 			r = dma_mapping_error(dev, src[i]);
 			if (r) {
-				pr_debug("failed %d dma_map_page\n", r);
+				dev_err(adev->dev, "fail %d dma_map_page\n", r);
 				goto out_free_vram_pages;
 			}
 		} else {
@@ -325,7 +329,7 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 			continue;
 		}
 
-		pr_debug("dma mapping src to 0x%llx, page_to_pfn 0x%lx\n",
+		pr_debug_ratelimited("dma mapping src to 0x%llx, pfn 0x%lx\n",
 				     src[i] >> PAGE_SHIFT, page_to_pfn(spage));
 
 		if (j >= (cursor.size >> PAGE_SHIFT) - 1 && i < npages - 1) {
@@ -405,8 +409,8 @@ svm_migrate_vma_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
 
 	r = migrate_vma_setup(&migrate);
 	if (r) {
-		pr_debug("failed %d prepare migrate svms 0x%p [0x%lx 0x%lx]\n",
-			 r, prange->svms, prange->start, prange->last);
+		dev_err(adev->dev, "vma setup fail %d range [0x%lx 0x%lx]\n", r,
+			prange->start, prange->last);
 		goto out_free;
 	}
 	if (migrate.cpages != npages) {
@@ -506,7 +510,7 @@ static void svm_migrate_page_free(struct page *page)
 	struct svm_range_bo *svm_bo = page->zone_device_data;
 
 	if (svm_bo) {
-		pr_debug("svm_bo ref left: %d\n", kref_read(&svm_bo->kref));
+		pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref));
 		svm_range_bo_unref(svm_bo);
 	}
 }
@@ -572,11 +576,11 @@ svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange,
 		dst[i] = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_FROM_DEVICE);
 		r = dma_mapping_error(dev, dst[i]);
 		if (r) {
-			pr_debug("failed %d dma_map_page\n", r);
+			dev_err(adev->dev, "fail %d dma_map_page\n", r);
 			goto out_oom;
 		}
 
-		pr_debug("dma mapping dst to 0x%llx, page_to_pfn 0x%lx\n",
+		pr_debug_ratelimited("dma mapping dst to 0x%llx, pfn 0x%lx\n",
 				     dst[i] >> PAGE_SHIFT, page_to_pfn(dpage));
 
 		migrate->dst[i] = migrate_pfn(page_to_pfn(dpage));
@@ -631,8 +635,8 @@ svm_migrate_vma_to_ram(struct amdgpu_device *adev, struct svm_range *prange,
 
 	r = migrate_vma_setup(&migrate);
 	if (r) {
-		pr_debug("failed %d prepare migrate svms 0x%p [0x%lx 0x%lx]\n",
-			 r, prange->svms, prange->start, prange->last);
+		dev_err(adev->dev, "vma setup fail %d range [0x%lx 0x%lx]\n", r,
+			prange->start, prange->last);
 		goto out_free;
 	}
 

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -33,6 +33,11 @@
 #include "kfd_svm.h"
 #include "kfd_migrate.h"
 
+#ifdef dev_fmt
+#undef dev_fmt
+#endif
+#define dev_fmt(fmt) "kfd_svm: %s: " fmt, __func__
+
 #define AMDGPU_SVM_RANGE_RESTORE_DELAY_MS 1
 
 /* Long enough to ensure no retry fault comes after svm range is restored and
@@ -158,16 +163,16 @@ svm_range_dma_map_dev(struct amdgpu_device *adev, struct svm_range *prange,
 				   bo_adev->vm_manager.vram_base_offset -
 				   bo_adev->kfd.dev->pgmap.range.start;
 			addr[i] |= SVM_RANGE_VRAM_DOMAIN;
-			pr_debug("vram address detected: 0x%llx\n", addr[i]);
+			pr_debug_ratelimited("vram address: 0x%llx\n", addr[i]);
 			continue;
 		}
 		addr[i] = dma_map_page(dev, page, 0, PAGE_SIZE, dir);
 		r = dma_mapping_error(dev, addr[i]);
 		if (r) {
-			pr_debug("failed %d dma_map_page\n", r);
+			dev_err(dev, "failed %d dma_map_page\n", r);
 			return r;
 		}
-		pr_debug("dma mapping 0x%llx for page addr 0x%lx\n",
+		pr_debug_ratelimited("dma mapping 0x%llx for page addr 0x%lx\n",
 				     addr[i] >> PAGE_SHIFT, page_to_pfn(page));
 	}
 	return 0;
@@ -217,7 +222,7 @@ void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr,
 	for (i = offset; i < offset + npages; i++) {
 		if (!svm_is_valid_dma_mapping_addr(dev, dma_addr[i]))
 			continue;
-		pr_debug("dma unmapping 0x%llx\n", dma_addr[i] >> PAGE_SHIFT);
+		pr_debug_ratelimited("unmap 0x%llx\n", dma_addr[i] >> PAGE_SHIFT);
 		dma_unmap_page(dev, dma_addr[i], PAGE_SIZE, dir);
 		dma_addr[i] = 0;
 	}
@@ -1454,7 +1459,7 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
 		/* This should never happen. actual_loc gets set by
 		 * svm_migrate_ram_to_vram after allocating a BO.
 		 */
-		WARN(1, "VRAM BO missing during validation\n");
+		WARN_ONCE(1, "VRAM BO missing during validation\n");
 		return -EINVAL;
 	}