This helps map DMA addresses back to physical addresses.
Signed-off-by: Tom St Denis <tom.stde...@amd.com>
(v2): Added tracepoints for USERPTR, SG mappings, and
SWIOTBL mappings. Reformatted trace call perform
PCI decoding internal to the trace.
---
drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h | 28 +++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 35 ++++++++++++++++++++++++-------
2 files changed, 56 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
index 509f7a63d40c..3e0f1885a379 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(struct amdgpu_device *adev, uint64_t dma_address, uint64_t
phys_address),
+ TP_ARGS(adev, 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 = pci_domain_nr(adev->pdev->bus);
+ __entry->bus = adev->pdev->bus->number;
+ __entry->slot = PCI_SLOT(adev->pdev->devfn);
+ __entry->func = PCI_FUNC(adev->pdev->devfn);
+ __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..7857fc581342 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)
@@ -667,7 +668,7 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
struct amdgpu_ttm_tt *gtt = (void *)ttm;
- unsigned nents;
+ unsigned i, nents;
int r;
int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
@@ -688,6 +689,15 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
gtt->ttm.dma_address, ttm->num_pages);
+ if (unlikely(trace_amdgpu_ttm_tt_populate_enabled())) {
+ for (i = 0; i < ttm->num_pages; i++) {
+ trace_amdgpu_ttm_tt_populate(
+ adev,
+ gtt->ttm.dma_address[i],
+ page_to_phys(ttm->pages[i]));
+ }
+ }
+
return 0;
release_sg:
@@ -892,7 +902,7 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct
ttm_bo_device *bdev,
static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
{
- struct amdgpu_device *adev;
+ struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
struct amdgpu_ttm_tt *gtt = (void *)ttm;
unsigned i;
int r;
@@ -915,14 +925,14 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
gtt->ttm.dma_address,
ttm->num_pages);
ttm->state = tt_unbound;
- return 0;
+ r = 0;
+ goto trace_mappings;
}
- adev = amdgpu_ttm_adev(ttm->bdev);
-
#ifdef CONFIG_SWIOTLB
if (swiotlb_nr_tbl()) {
- return ttm_dma_populate(>t->ttm, adev->dev);
+ r = ttm_dma_populate(>t->ttm, adev->dev);
+ goto trace_mappings;
}
#endif
@@ -945,7 +955,18 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
return -EFAULT;
}
}
- return 0;
+
+ r = 0;
+trace_mappings:
+ if (!r && unlikely(trace_amdgpu_ttm_tt_populate_enabled())) {
+ for (i = 0; i < ttm->num_pages; i++) {
+ trace_amdgpu_ttm_tt_populate(
+ adev,
+ gtt->ttm.dma_address[i],
+ page_to_phys(ttm->pages[i]));
+ }
+ }
+ return r;
}
static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
--
2.12.0
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