[PATCH] drm/amd/amdgpu: Add tracepoint for DMA page mapping

[tom.stdenis@xxxxxxx (Tom St Denis)]

This helps map DMA addresses back to physical addresses.

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h | 28 ++++++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c   |  8 ++++++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
index 509f7a63d40c..5b2bb28da504 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
@@ -14,6 +14,34 @@
 #define AMDGPU_JOB_GET_TIMELINE_NAME(job) \
 	 job->base.s_fence->finished.ops->get_timeline_name(&job->base.s_fence->finished)
 
+TRACE_EVENT(amdgpu_ttm_tt_populate,
+	    TP_PROTO(uint16_t domain, uint8_t bus, uint8_t slot, uint8_t func, uint64_t dma_address, uint64_t phys_address),
+	    TP_ARGS(domain, bus, slot, func, dma_address, phys_address),
+	    TP_STRUCT__entry(
+				__field(uint16_t, domain)
+				__field(uint8_t, bus)
+				__field(uint8_t, slot)
+				__field(uint8_t, func)
+				__field(uint64_t, dma)
+				__field(uint64_t, phys)
+			    ),
+	    TP_fast_assign(
+			   __entry->domain = domain;
+			   __entry->bus = bus;
+			   __entry->slot = slot;
+			   __entry->func = func;
+			   __entry->dma = dma_address;
+			   __entry->phys = phys_address;
+			   ),
+	    TP_printk("%04x:%02x:%02x.%x: 0x%llx => 0x%llx",
+		      (unsigned)__entry->domain,
+		      (unsigned)__entry->bus,
+		      (unsigned)__entry->slot,
+		      (unsigned)__entry->func,
+		      (unsigned long long)__entry->dma,
+		      (unsigned long long)__entry->phys)
+);
+
 TRACE_EVENT(amdgpu_mm_rreg,
 	    TP_PROTO(unsigned did, uint32_t reg, uint32_t value),
 	    TP_ARGS(did, reg, value),
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 8da59d212b3b..1cf274603476 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -43,6 +43,7 @@
 #include <linux/pagemap.h>
 #include <linux/debugfs.h>
 #include "amdgpu.h"
+#include "amdgpu_trace.h"
 #include "bif/bif_4_1_d.h"
 
 #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
@@ -944,6 +945,13 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
 			ttm_pool_unpopulate(ttm);
 			return -EFAULT;
 		}
+		trace_amdgpu_ttm_tt_populate(
+			pci_domain_nr(adev->pdev->bus),
+			adev->pdev->bus->number,
+			PCI_SLOT(adev->pdev->devfn),
+			PCI_FUNC(adev->pdev->devfn),
+			gtt->ttm.dma_address[i],
+			page_to_phys(ttm->pages[i]));
 	}
 	return 0;
 }
-- 
2.12.0