[PATCH v2 26/29] drm/xe: Add SVM debug
Matthew Brost
matthew.brost at intel.com
Wed Oct 16 03:25:15 UTC 2024
Add some useful SVM debug logging.
v2:
- Upadte logging with latest structure layout
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
drivers/gpu/drm/xe/xe_pt.c | 8 +++
drivers/gpu/drm/xe/xe_svm.c | 101 +++++++++++++++++++++++++++++++-----
drivers/gpu/drm/xe/xe_svm.h | 2 +
3 files changed, 99 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index 687abd1a5e74..75f548ebe2b3 100644
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -632,6 +632,7 @@ xe_pt_stage_bind(struct xe_tile *tile, struct xe_vma *vma,
/* Move this entire thing to xe_svm.c? */
xe_svm_notifier_lock(xe_vma_vm(vma));
if (!xe_svm_range_pages_valid(range)) {
+ xe_svm_range_debug(range, "BIND PREPARE - RETRY");
xe_svm_notifier_unlock(xe_vma_vm(vma));
return -EAGAIN;
}
@@ -640,6 +641,10 @@ xe_pt_stage_bind(struct xe_tile *tile, struct xe_vma *vma,
range->base.va.end - range->base.va.start,
&curs);
is_devmem = xe_res_is_vram(&curs);
+ if (is_devmem)
+ xe_svm_range_debug(range, "BIND PREPARE - DMA VRAM");
+ else
+ xe_svm_range_debug(range, "BIND PREPARE - DMA");
} else {
xe_assert(xe, false);
}
@@ -1397,10 +1402,13 @@ static int xe_pt_svm_pre_commit(struct xe_migrate_pt_update *pt_update)
if (op->subop == XE_VMA_SUBOP_UNMAP_RANGE)
continue;
+ xe_svm_range_debug(range, "PRE-COMMIT");
+
xe_assert(vm->xe, xe_vma_is_system_allocator(op->map_range.vma));
xe_assert(vm->xe, op->subop == XE_VMA_SUBOP_MAP_RANGE);
if (!xe_svm_range_pages_valid(range)) {
+ xe_svm_range_debug(range, "PRE-COMMIT - RETRY");
xe_svm_notifier_unlock(vm);
return -EAGAIN;
}
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 555bc71ae523..acf2a3750f38 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -14,6 +14,18 @@
#include "xe_vm.h"
#include "xe_vm_types.h"
+static bool xe_svm_range_in_vram(struct xe_svm_range *range)
+{
+ /* Not reliable without notifier lock */
+ return range->base.flags.has_devmem_pages;
+}
+
+static bool xe_svm_range_has_vram_binding(struct xe_svm_range *range)
+{
+ /* Not reliable without notifier lock */
+ return xe_svm_range_in_vram(range) && range->tile_present;
+}
+
static struct xe_vm *gpusvm_to_vm(struct drm_gpusvm *gpusvm)
{
return container_of(gpusvm, struct xe_vm, svm.gpusvm);
@@ -24,6 +36,23 @@ static struct xe_vm *range_to_vm(struct drm_gpusvm_range *r)
return gpusvm_to_vm(r->gpusvm);
}
+#define range_debug(r__, operaton__) \
+ vm_dbg(&range_to_vm(&(r__)->base)->xe->drm, \
+ "%s: asid=%u, gpusvm=0x%016llx, vram=%d,%d, seqno=%lu, " \
+ "start=0x%014llx, end=0x%014llx, size=%llu", \
+ (operaton__), range_to_vm(&(r__)->base)->usm.asid, \
+ (u64)(r__)->base.gpusvm, \
+ xe_svm_range_in_vram((r__)) ? 1 : 0, \
+ xe_svm_range_has_vram_binding((r__)) ? 1 : 0, \
+ (r__)->base.notifier_seq, \
+ (r__)->base.va.start, (r__)->base.va.end, \
+ (r__)->base.va.end - (r__)->base.va.start)
+
+void xe_svm_range_debug(struct xe_svm_range *range, const char *operation)
+{
+ range_debug(range, operation);
+}
+
static void *xe_svm_devm_owner(struct xe_device *xe)
{
return xe;
@@ -61,6 +90,8 @@ xe_svm_garbage_collector_add_range(struct xe_vm *vm, struct xe_svm_range *range,
{
struct xe_device *xe = vm->xe;
+ range_debug(range, "GARBAGE COLLECTOR ADD");
+
drm_gpusvm_range_set_unmapped(&range->base, mmu_range);
spin_lock(&vm->svm.garbage_collector.lock);
@@ -84,10 +115,14 @@ xe_svm_range_notifier_event_begin(struct xe_vm *vm, struct drm_gpusvm_range *r,
u8 tile_mask = 0;
u8 id;
+ range_debug(range, "NOTIFIER");
+
/* Skip if already unmapped or if no binding exist */
if (range->base.flags.unmapped || !range->tile_present)
return 0;
+ range_debug(range, "NOTIFIER - EXECUTE");
+
/* Adjust invalidation to range boundaries */
if (range->base.va.start < mmu_range->start)
*adj_start = range->base.va.start;
@@ -139,6 +174,11 @@ static void xe_svm_invalidate(struct drm_gpusvm *gpusvm,
if (xe_vm_is_closed(vm))
return;
+ vm_dbg(&gpusvm_to_vm(gpusvm)->xe->drm,
+ "INVALIDATE: asid=%u, gpusvm=0x%016llx, seqno=%lu, start=0x%016lx, end=0x%016lx, event=%d",
+ vm->usm.asid, (u64)gpusvm, notifier->notifier.invalidate_seq,
+ mmu_range->start, mmu_range->end, mmu_range->event);
+
/* Adjust invalidation to notifier boundaries */
if (adj_start < notifier->interval.start)
adj_start = notifier->interval.start;
@@ -218,8 +258,12 @@ static int __xe_svm_garbage_collector(struct xe_vm *vm,
{
struct dma_fence *fence;
- if (IS_DGFX(vm->xe) && range->base.flags.partial_unmap)
+ range_debug(range, "GARBAGE COLLECTOR");
+
+ if (IS_DGFX(vm->xe) && range->base.flags.partial_unmap) {
+ range_debug(range, "GARBAGE COLLECTOT - EVICT");
drm_gpusvm_range_evict(&vm->svm.gpusvm, &range->base);
+ }
xe_vm_lock(vm, false);
fence = xe_vm_range_unbind(vm, range);
@@ -350,16 +394,23 @@ static int xe_svm_copy(struct page **pages, dma_addr_t *dma_addr,
int incr = (match && last) ? 1 : 0;
if (vram_addr != VRAM_ADDR_INVALID) {
- if (sram)
+ if (sram) {
+ vm_dbg(&tile->xe->drm,
+ "COPY TO SRAM - 0x%016llx -> 0x%016llx, NPAGES=%ld",
+ vram_addr, dma_addr[pos], i - pos + incr);
__fence = xe_migrate_from_vram(tile->migrate,
i - pos + incr,
vram_addr,
dma_addr + pos);
- else
+ } else {
+ vm_dbg(&tile->xe->drm,
+ "COPY TO VRAM - 0x%016llx -> 0x%016llx, NPAGES=%ld",
+ dma_addr[pos], vram_addr, i - pos + incr);
__fence = xe_migrate_to_vram(tile->migrate,
i - pos + incr,
dma_addr + pos,
vram_addr);
+ }
if (IS_ERR(__fence)) {
err = PTR_ERR(__fence);
goto err_out;
@@ -377,14 +428,21 @@ static int xe_svm_copy(struct page **pages, dma_addr_t *dma_addr,
}
if (!match && last && dma_addr[i] && spage) {
- if (sram)
+ if (sram) {
+ vm_dbg(&tile->xe->drm,
+ "COPY TO SRAM - 0x%016llx -> 0x%016llx, NPAGES=%d",
+ vram_addr, dma_addr[pos], 1);
__fence = xe_migrate_from_vram(tile->migrate, 1,
vram_addr,
dma_addr + pos);
- else
+ } else {
+ vm_dbg(&tile->xe->drm,
+ "COPY TO VRAM - 0x%016llx -> 0x%016llx, NPAGES=%d",
+ dma_addr[pos], vram_addr, 1);
__fence = xe_migrate_to_vram(tile->migrate, 1,
dma_addr + pos,
vram_addr);
+ }
if (IS_ERR(__fence)) {
err = PTR_ERR(__fence);
goto err_out;
@@ -554,12 +612,14 @@ static struct xe_bo *xe_svm_alloc_vram(struct xe_vm *vm, struct xe_tile *tile,
const struct drm_gpusvm_ctx *ctx)
{
struct xe_mem_region *mr = tile_to_mr(tile);
+ struct drm_buddy *buddy = tile_to_buddy(tile);
struct drm_buddy_block *block;
struct list_head *blocks;
struct xe_bo *bo;
ktime_t end = 0;
int err;
+ range_debug(range, "ALLOCATE VRAM");
retry:
xe_vm_lock(vm, false);
bo = xe_bo_create(tile_to_xe(tile), tile, vm, range->base.va.end -
@@ -582,8 +642,13 @@ static struct xe_bo *xe_svm_alloc_vram(struct xe_vm *vm, struct xe_tile *tile,
range->base.va.start);
blocks = &to_xe_ttm_vram_mgr_resource(bo->ttm.resource)->blocks;
- list_for_each_entry(block, blocks, link)
+ list_for_each_entry(block, blocks, link) {
+ vm_dbg(&vm->xe->drm, "ALLOC VRAM: asid=%u, gpusvm=0x%016llx, pfn=%llu, npages=%llu",
+ vm->usm.asid, (u64)&vm->svm.gpusvm,
+ block_offset_to_pfn(mr, drm_buddy_block_offset(block)),
+ drm_buddy_block_size(buddy, block) >> PAGE_SHIFT);
block->private = mr;
+ }
/*
* Take ref because as soon as drm_gpusvm_migrate_to_devmem succeeds the
@@ -637,6 +702,8 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
if (xe_svm_range_is_valid(range, tile))
return 0;
+ range_debug(range, "PAGE FAULT");
+
/* XXX: Add migration policy, for now migrate range once */
if (IS_DGFX(vm->xe) && !range->migrated &&
range->base.flags.migrate_devmem &&
@@ -646,25 +713,33 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
bo = xe_svm_alloc_vram(vm, tile, range, &ctx);
if (IS_ERR(bo)) {
drm_info(&vm->xe->drm,
- "VRAM allocation failed, falling back to retrying, asid=%u, errno %ld\n",
- vm->usm.asid, PTR_ERR(bo));
+ "VRAM allocation failed, falling back to retrying, asid=%u, gpusvm=0x%016llx, errno %ld\n",
+ vm->usm.asid, (u64)&vm->svm.gpusvm,
+ PTR_ERR(bo));
bo = NULL;
goto retry;
}
}
+ range_debug(range, "GET PAGES");
err = drm_gpusvm_range_get_pages(&vm->svm.gpusvm, r, &ctx);
- if (err == -EFAULT || err == -EPERM) /* Corner where CPU mappings have change */
if (err == -EOPNOTSUPP || err == -EFAULT || err == -EPERM) { /* Corner where CPU mappings have change */
- if (err == -EOPNOTSUPP)
+ if (err == -EOPNOTSUPP) {
+ range_debug(range, "PAGE FAULT - EVICT PAGES");
drm_gpusvm_range_evict(&vm->svm.gpusvm, &range->base);
+ }
drm_info(&vm->xe->drm,
"Get pages failed, falling back to retrying, asid=%u, gpusvm=0x%016llx, errno %d\n",
vm->usm.asid, (u64)&vm->svm.gpusvm, err);
+ range_debug(range, "PAGE FAULT - RETRY PAGES");
goto retry;
}
- if (err)
+ if (err) {
+ range_debug(range, "PAGE FAULT - FAIL PAGE COLLECT");
goto err_out;
+ }
+
+ range_debug(range, "PAGE FAULT - BIND");
retry_bind:
drm_exec_init(&exec, 0, 0);
@@ -680,8 +755,10 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
if (IS_ERR(fence)) {
drm_exec_fini(&exec);
err = PTR_ERR(fence);
- if (err == -EAGAIN)
+ if (err == -EAGAIN) {
+ range_debug(range, "PAGE FAULT - RETRY BIND");
goto retry;
+ }
if (xe_vm_validate_should_retry(&exec, err, &end))
goto retry_bind;
goto err_out;
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 5b9d5ac9ef72..139acee41b42 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -36,6 +36,8 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
bool atomic);
bool xe_svm_has_mapping(struct xe_vm *vm, u64 start, u64 end);
+void xe_svm_range_debug(struct xe_svm_range *range, const char *operation);
+
int xe_svm_bo_evict(struct xe_bo *bo);
static inline bool xe_svm_range_pages_valid(struct xe_svm_range *range)
--
2.34.1
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