Am 16.01.2018 um 07:02 schrieb He, Roger:
-----Original Message-----
From: Andrey Grodzovsky [mailto:andrey.grodzov...@amd.com]
Sent: Saturday, January 13, 2018 6:29 AM
To: dri-devel@lists.freedesktop.org; amd-...@lists.freedesktop.org
Cc: Koenig, Christian <christian.koe...@amd.com>; He, Roger <hongbo...@amd.com>;
Grodzovsky, Andrey <andrey.grodzov...@amd.com>
Subject: [PATCH 1/2] drm/ttm: Allow page allocations w/o triggering OOM..
This to allow drivers to choose to avoid OOM invocation and handle page
allocation failures instead.
Signed-off-by: Andrey Grodzovsky <andrey.grodzov...@amd.com>
---
drivers/gpu/drm/ttm/ttm_bo.c | 3 +++
drivers/gpu/drm/ttm/ttm_page_alloc.c | 6 ++++++
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 3 +++
drivers/gpu/drm/ttm/ttm_tt.c | 13 +++++++++++--
include/drm/ttm/ttm_bo_api.h | 1 +
include/drm/ttm/ttm_bo_driver.h | 4 ++++
6 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index
2eb71ff..f32aab1 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -234,6 +234,9 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo,
bool zero_alloc)
if (bdev->need_dma32)
page_flags |= TTM_PAGE_FLAG_DMA32;
+ if (bdev->no_retry)
+ page_flags |= TTM_PAGE_FLAG_NO_RETRY;
+
switch (bo->type) {
case ttm_bo_type_device:
if (zero_alloc)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c
b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 0eab24e..f34c843 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -741,6 +741,9 @@ static int ttm_page_pool_get_pages(struct ttm_page_pool
*pool,
if (ttm_flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
+ if (ttm_flags & TTM_PAGE_FLAG_NO_RETRY)
+ gfp_flags |= __GFP_RETRY_MAYFAIL;
+
/* ttm_alloc_new_pages doesn't reference pool so we can run
* multiple requests in parallel.
**/
@@ -893,6 +896,9 @@ static int ttm_get_pages(struct page **pages, unsigned
npages, int flags,
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
+ if (flags & TTM_PAGE_FLAG_NO_RETRY)
+ gfp_flags |= __GFP_RETRY_MAYFAIL;
+
if (flags & TTM_PAGE_FLAG_DMA32)
gfp_flags |= GFP_DMA32;
else
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index c7f01a4..6949ef7 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -920,6 +920,9 @@ static gfp_t ttm_dma_pool_gfp_flags(struct ttm_dma_tt
*ttm_dma, bool huge)
gfp_flags &= ~__GFP_COMP;
}
+ if (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY)
+ gfp_flags |= __GFP_RETRY_MAYFAIL;
+
return gfp_flags;
}
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 5a046a3..9e4d43d 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -301,7 +301,11 @@ int ttm_tt_swapin(struct ttm_tt *ttm)
swap_space = swap_storage->f_mapping;
for (i = 0; i < ttm->num_pages; ++i) {
- from_page = shmem_read_mapping_page(swap_space, i);
+ gfp_t gfp_mask = mapping_gfp_mask(swap_space);
+
+ gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ?
__GFP_RETRY_MAYFAIL : 0);
+ from_page = shmem_read_mapping_page_gfp(swap_space, i,
gfp_mask);
+
if (IS_ERR(from_page)) {
ret = PTR_ERR(from_page);
goto out_err;
@@ -350,10 +354,15 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file
*persistent_swap_storage)
swap_space = swap_storage->f_mapping;
for (i = 0; i < ttm->num_pages; ++i) {
+ gfp_t gfp_mask = mapping_gfp_mask(swap_space);
+
+ gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ?
+__GFP_RETRY_MAYFAIL : 0);
+
from_page = ttm->pages[i];
if (unlikely(from_page == NULL))
continue;
- to_page = shmem_read_mapping_page(swap_space, i);
+
+ to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
if (IS_ERR(to_page)) {
ret = PTR_ERR(to_page);
goto out_err;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h index
2cd025c..099f24b 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -176,6 +176,7 @@ struct ttm_buffer_object {
unsigned long num_pages;
size_t acc_size;
+
Please remove this newline here.
Apart from that, this patch is Reviewed-by: Roger He <hongbo...@amd.com>
Jup agree, apart from the nit pick the patch is Reviewed-by: Christian
König <christian.koe...@amd.com> as well.
Christian.
Thanks
Roger(Hongbo.He)
/**
* Members not needing protection.
*/
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 94064b1..9b417eb 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -86,6 +86,7 @@ struct ttm_backend_func {
#define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6)
#define TTM_PAGE_FLAG_DMA32 (1 << 7)
#define TTM_PAGE_FLAG_SG (1 << 8)
+#define TTM_PAGE_FLAG_NO_RETRY (1 << 9)
enum ttm_caching_state {
tt_uncached,
@@ -556,6 +557,7 @@ struct ttm_bo_global {
* @dev_mapping: A pointer to the struct address_space representing the
* device address space.
* @wq: Work queue structure for the delayed delete workqueue.
+ * @no_retry: Don't retry allocation if it fails
*
*/
@@ -592,6 +594,8 @@ struct ttm_bo_device {
struct delayed_work wq;
bool need_dma32;
+
+ bool no_retry;
};
/**
--
2.7.4
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