drm/ttm: Add DMA map/unmap tracepoint (v3)

Also exports two functions that vendor drivers can call
to trace DMA mappings.  This is meant to help translate
IOMMU mappings of bus addresses back to physical pages.

Used by the umr amdgpu debugger for instance.

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

(v2): Use dev_name() to get PCI path instead.
(v3): Use correct types for dma/phys addresses

drivers/gpu/drm/ttm/Makefile

@@ -1,10 +1,11 @@
 #
 # Makefile for the drm device driver.  This driver provides support for the
 
+ccflags-y := -I$(src)/.
 ttm-y := ttm_memory.o ttm_tt.o ttm_bo.o \
 	ttm_bo_util.o ttm_bo_vm.o ttm_module.o \
 	ttm_object.o ttm_lock.o ttm_execbuf_util.o ttm_page_alloc.o \
-	ttm_bo_manager.o ttm_page_alloc_dma.o
+	ttm_bo_manager.o ttm_page_alloc_dma.o ttm_debug.o ttm_tracepoints.o
 ttm-$(CONFIG_AGP) += ttm_agp_backend.o
 
 obj-$(CONFIG_DRM_TTM) += ttm.o

drivers/gpu/drm/ttm/ttm_debug.c

@@ -0,0 +1,74 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2017 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Tom St Denis <tom.stdenis@amd.com>
+ */
+#include <linux/sched.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/shmem_fs.h>
+#include <linux/file.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <drm/drm_cache.h>
+#include <drm/ttm/ttm_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/ttm/ttm_page_alloc.h>
+#include "ttm_trace.h"
+
+void ttm_trace_dma_map(struct device *dev, struct ttm_dma_tt *tt)
+{
+	unsigned i;
+
+	if (unlikely(trace_ttm_dma_map_enabled())) {
+		for (i = 0; i < tt->ttm.num_pages; i++) {
+			trace_ttm_dma_map(
+				dev,
+				tt->ttm.pages[i],
+				tt->dma_address[i]);
+		}
+	}
+}
+EXPORT_SYMBOL(ttm_trace_dma_map);
+
+void ttm_trace_dma_unmap(struct device *dev, struct ttm_dma_tt *tt)
+{
+	unsigned i;
+
+	if (unlikely(trace_ttm_dma_unmap_enabled())) {
+		for (i = 0; i < tt->ttm.num_pages; i++) {
+			trace_ttm_dma_unmap(
+				dev,
+				tt->ttm.pages[i],
+				tt->dma_address[i]);
+		}
+	}
+}
+EXPORT_SYMBOL(ttm_trace_dma_unmap);
+

drivers/gpu/drm/ttm/ttm_trace.h

@@ -0,0 +1,87 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2017 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Tom St Denis <tom.stdenis@amd.com>
+ */
+#if !defined(_TTM_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TTM_TRACE_H_
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+#include <drm/drmP.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM ttm
+#define TRACE_INCLUDE_FILE ttm_trace
+
+TRACE_EVENT(ttm_dma_map,
+	    TP_PROTO(struct device *dev, struct page *page, dma_addr_t dma_address),
+	    TP_ARGS(dev, page, dma_address),
+	    TP_STRUCT__entry(
+				__string(device, dev_name(dev))
+				__field(dma_addr_t, dma)
+				__field(phys_addr_t, phys)
+			    ),
+	    TP_fast_assign(
+			   __assign_str(device, dev_name(dev));
+			   __entry->dma = dma_address;
+			   __entry->phys = page_to_phys(page);
+			   ),
+	    TP_printk("%s: %pad => %pa",
+		      __get_str(device),
+		      &__entry->dma,
+		      &__entry->phys)
+);
+
+TRACE_EVENT(ttm_dma_unmap,
+	    TP_PROTO(struct device *dev, struct page *page, dma_addr_t dma_address),
+	    TP_ARGS(dev, page, dma_address),
+	    TP_STRUCT__entry(
+				__string(device, dev_name(dev))
+				__field(dma_addr_t, dma)
+				__field(phys_addr_t, phys)
+			    ),
+	    TP_fast_assign(
+			   __assign_str(device, dev_name(dev));
+			   __entry->dma = dma_address;
+			   __entry->phys = page_to_phys(page);
+			   ),
+	    TP_printk("%s: %pad => %pa",
+		      __get_str(device),
+		      &__entry->dma,
+		      &__entry->phys)
+);
+
+#endif
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#include <trace/define_trace.h>
+

drivers/gpu/drm/ttm/ttm_tracepoints.c

@@ -0,0 +1,45 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2017 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Tom St Denis <tom.stdenis@amd.com>
+ */
+#include <linux/sched.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/shmem_fs.h>
+#include <linux/file.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <drm/drm_cache.h>
+#include <drm/ttm/ttm_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/ttm/ttm_page_alloc.h>
+
+#define CREATE_TRACE_POINTS
+#include "ttm_trace.h"

include/drm/ttm/ttm_debug.h

@@ -0,0 +1,31 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2017 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * Authors: Tom St Denis <tom.stdenis@amd.com>
+ */
+extern void ttm_trace_dma_map(struct device *dev, struct ttm_dma_tt *tt);
+extern void ttm_trace_dma_unmap(struct device *dev, struct ttm_dma_tt *tt);