linux-kernel - Re: [PATCH] drm/ttm: remove cpu_address member from ttm_tt

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Date:   Fri, 16 Sep 2016 15:36:46 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian König <deathsimple@...afone.de>
Cc:     Alexandre Courbot <acourbot@...dia.com>,
        David Airlie <airlied@...ux.ie>, gnurou@...il.com,
        LKML <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/ttm: remove cpu_address member from ttm_tt

On Fri, Sep 16, 2016 at 5:43 AM, Christian König
<deathsimple@...afone.de> wrote:
> Am 16.09.2016 um 11:32 schrieb Alexandre Courbot:
>>
>> Patch 3d50d4dcb0 exposed the CPU address of DMA-allocated pages as
>> returned by dma_alloc_coherent because Nouveau on Tegra needed it.
>>
>> This is not required anymore - as there were no other users for it,
>> remove it and save some memory for everyone.
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>
>
> Reviewed-by: Christian König <christian.koenig@....com>.
>
>

Applied.  thanks!

Alex

>> ---
>>   drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 2 --
>>   drivers/gpu/drm/ttm/ttm_tt.c             | 7 ++-----
>>   include/drm/ttm/ttm_bo_driver.h          | 2 --
>>   3 files changed, 2 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
>> b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
>> index bef9f6feb635..cec4b4baa179 100644
>> --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
>> +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
>> @@ -858,7 +858,6 @@ static int ttm_dma_pool_get_pages(struct dma_pool
>> *pool,
>>         if (count) {
>>                 d_page = list_first_entry(&pool->free_list, struct
>> dma_page, page_list);
>>                 ttm->pages[index] = d_page->p;
>> -               ttm_dma->cpu_address[index] = d_page->vaddr;
>>                 ttm_dma->dma_address[index] = d_page->dma;
>>                 list_move_tail(&d_page->page_list, &ttm_dma->pages_list);
>>                 r = 0;
>> @@ -989,7 +988,6 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma,
>> struct device *dev)
>>         INIT_LIST_HEAD(&ttm_dma->pages_list);
>>         for (i = 0; i < ttm->num_pages; i++) {
>>                 ttm->pages[i] = NULL;
>> -               ttm_dma->cpu_address[i] = 0;
>>                 ttm_dma->dma_address[i] = 0;
>>         }
>>   diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
>> index bc5aa573f466..aee3c00f836e 100644
>> --- a/drivers/gpu/drm/ttm/ttm_tt.c
>> +++ b/drivers/gpu/drm/ttm/ttm_tt.c
>> @@ -57,10 +57,8 @@ static void ttm_dma_tt_alloc_page_directory(struct
>> ttm_dma_tt *ttm)
>>   {
>>         ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages,
>>                                           sizeof(*ttm->ttm.pages) +
>> -                                         sizeof(*ttm->dma_address) +
>> -                                         sizeof(*ttm->cpu_address));
>> -       ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
>> -       ttm->dma_address = (void *) (ttm->cpu_address +
>> ttm->ttm.num_pages);
>> +                                         sizeof(*ttm->dma_address));
>> +       ttm->dma_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
>>   }
>>     #ifdef CONFIG_X86
>> @@ -244,7 +242,6 @@ void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
>>         drm_free_large(ttm->pages);
>>         ttm->pages = NULL;
>> -       ttm_dma->cpu_address = NULL;
>>         ttm_dma->dma_address = NULL;
>>   }
>>   EXPORT_SYMBOL(ttm_dma_tt_fini);
>> diff --git a/include/drm/ttm/ttm_bo_driver.h
>> b/include/drm/ttm/ttm_bo_driver.h
>> index c986fa7effd2..4f0a92185995 100644
>> --- a/include/drm/ttm/ttm_bo_driver.h
>> +++ b/include/drm/ttm/ttm_bo_driver.h
>> @@ -133,7 +133,6 @@ struct ttm_tt {
>>    * struct ttm_dma_tt
>>    *
>>    * @ttm: Base ttm_tt struct.
>> - * @cpu_address: The CPU address of the pages
>>    * @dma_address: The DMA (bus) addresses of the pages
>>    * @pages_list: used by some page allocation backend
>>    *
>> @@ -143,7 +142,6 @@ struct ttm_tt {
>>    */
>>   struct ttm_dma_tt {
>>         struct ttm_tt ttm;
>> -       void **cpu_address;
>>         dma_addr_t *dma_address;
>>         struct list_head pages_list;
>>   };
>
>
>
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> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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