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From a9fc51a1216c1137c5089925edf6632fc4ef2643 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Sat, 2 Sep 2017 13:21:31 +0200
Subject: [PATCH 0911/4131] drm/amdgpu: fix userptr put_page handling
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Move calling put_page into the unpopulate callback. Otherwise we mess up the pages
reference count when it is unbound multiple times.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 6 ++----
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 14 +++++++++++++-
3 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index fa17a10..3700ad6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1854,6 +1854,7 @@ void amdgpu_cs_report_moved_bytes(struct amdgpu_device *adev, u64 num_bytes,
void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *abo, u32 domain);
bool amdgpu_ttm_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages);
+void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages);
int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
uint32_t flags);
bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 8bb55ed..0a1222b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -478,10 +478,8 @@ static int amdgpu_cs_list_validate(struct amdgpu_cs_parser *p,
/* Check if we have user pages and nobody bound the BO already */
if (lobj->user_pages && bo->tbo.ttm->state != tt_bound) {
- size_t size = sizeof(struct page *);
-
- size *= bo->tbo.ttm->num_pages;
- memcpy(bo->tbo.ttm->pages, lobj->user_pages, size);
+ amdgpu_ttm_tt_set_user_pages(bo->tbo.ttm,
+ lobj->user_pages);
binding_userptr = true;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index bbe7d2b..4274da4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -721,6 +721,18 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
return r;
}
+void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
+{
+ unsigned i;
+
+ for (i = 0; i < ttm->num_pages; ++i) {
+ if (ttm->pages[i])
+ put_page(ttm->pages[i]);
+
+ ttm->pages[i] = pages ? pages[i] : NULL;
+ }
+}
+
static void amdgpu_trace_dma_map(struct ttm_tt *ttm)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
@@ -795,7 +807,6 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
set_page_dirty(page);
mark_page_accessed(page);
- put_page(page);
}
amdgpu_trace_dma_unmap(ttm);
@@ -1021,6 +1032,7 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
if (gtt && gtt->userptr) {
+ amdgpu_ttm_tt_set_user_pages(ttm, NULL);
kfree(ttm->sg);
ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
return;
--
2.7.4
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