[PATCH 2/4] drm/ttm: add page order support in ttm_pages_put

[He, Roger]

From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.org] On Behalf Of Chunming Zhou
Sent: Wednesday, November 22, 2017 2:02 PM
To: dri-devel at lists.freedesktop.org
Subject: Re: [PATCH 2/4] drm/ttm: add page order support in ttm_pages_put




On 2017年11月22日 13:36, Roger He wrote:

Change-Id: Ia55b206d95812c5afcfd6cec29f580758d1f50f0

Signed-off-by: Roger He <Hongbo.He at amd.com><mailto:Hongbo.He at amd.com>

---

 drivers/gpu/drm/ttm/ttm_page_alloc.c | 42 +++++++++++++++++++++++++++++-------

 1 file changed, 34 insertions(+), 8 deletions(-)



diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c

index 0a0c653..de64209 100644

--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c

+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c

@@ -285,13 +285,39 @@ static struct ttm_page_pool *ttm_get_pool(int flags, bool huge,

 }



 /* set memory back to wb and free the pages. */

-static void ttm_pages_put(struct page *pages[], unsigned npages)

+static void ttm_pages_put(struct page *pages[], unsigned npages,

+        unsigned int order)

 {

- unsigned i;

- if (set_pages_array_wb(pages, npages))

-        pr_err("Failed to set %d pages to wb!\n", npages);

- for (i = 0; i < npages; ++i)

-        __free_page(pages[i]);

+ struct page **pages_to_free = NULL;

+ struct page **pages_array;

+ struct page *p;

+ unsigned int i, j, pages_nr = (1 << order);

+

+ if (order > 0) {

+        pages_to_free = kmalloc_array(pages_nr, sizeof(struct page *),

+                               GFP_KERNEL);

+        if (!pages_to_free) {

+                pr_err("Failed to allocate memory for ttm pages put operation\n");

+                return;

+        }

+ }

+

+ for (i = 0; i < npages; ++i) {

+        if (order > 0) {

+                p = pages[i];

+                for (j = 0; j < pages_nr; ++j)

+                        pages_to_free[j] = p++;

+

+                pages_array = pages_to_free;

+        } else

+                pages_array = pages;

+

+        if (set_pages_array_wb(pages_array, pages_nr))
you can use set_pages_wb(pages[i], 1 << order) to instead of creating page array marked red, this way, you will not need to kmalloc and patch#3.

and more, if you select set_pages_wb, you also need to clone it in TTM like set_pages_array_wb for non-x86 case.

good idea, going to refine code.

Thanks
Roger(Hongbo.He)


Regards,
David Zhou




+                pr_err("Failed to set %d pages to wb!\n", pages_nr);

+        __free_pages(pages[i], order);

+ }

+

+ kfree(pages_to_free);

 }



 static void ttm_pool_update_free_locked(struct ttm_page_pool *pool,

@@ -354,7 +380,7 @@ static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free,

                  */

                 spin_unlock_irqrestore(&pool->lock, irq_flags);



-                ttm_pages_put(pages_to_free, freed_pages);

+                ttm_pages_put(pages_to_free, freed_pages, pool->order);

                 if (likely(nr_free != FREE_ALL_PAGES))

                         nr_free -= freed_pages;



@@ -389,7 +415,7 @@ static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free,

  spin_unlock_irqrestore(&pool->lock, irq_flags);



  if (freed_pages)

-        ttm_pages_put(pages_to_free, freed_pages);

+        ttm_pages_put(pages_to_free, freed_pages, pool->order);

 out:

  if (pages_to_free != static_buf)

         kfree(pages_to_free);

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