Hi
Am 18.02.20 um 18:13 schrieb Nirmoy:
>
> On 2/18/20 1:44 PM, Christian König wrote:
>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>> Hi
>>>
>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>> GPU address handling is device specific and should be handle by its
>>>> device
>>>> driver.
>>>>
>>>> Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>
>>>> ---
>>>> drivers/gpu/drm/ttm/ttm_bo.c | 7 -------
>>>> include/drm/ttm/ttm_bo_api.h | 2 --
>>>> include/drm/ttm/ttm_bo_driver.h | 1 -
>>>> 3 files changed, 10 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>> index 151edfd8de77..d5885cd609a3 100644
>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct
>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>> drm_printf(p, " has_type: %d\n", man->has_type);
>>>> drm_printf(p, " use_type: %d\n", man->use_type);
>>>> drm_printf(p, " flags: 0x%08X\n", man->flags);
>>>> - drm_printf(p, " gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>> drm_printf(p, " size: %llu\n", man->size);
>>>> drm_printf(p, " available_caching: 0x%08X\n",
>>>> man->available_caching);
>>>> drm_printf(p, " default_caching: 0x%08X\n",
>>>> man->default_caching);
>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct
>>>> ttm_buffer_object *bo,
>>>> moved:
>>>> bo->evicted = false;
>>>> - if (bo->mem.mm_node)
>>>> - bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>> - bdev->man[bo->mem.mem_type].gpu_offset;
>>>> - else
>>>> - bo->offset = 0;
>>>> -
>>> After moving this into users, the else branch has been lost. Is
>>> 'bo->mem.mm_node' always true?
>>
>> At least for the amdgpu and radeon use cases, yes.
>>
>> But that is a rather good question I mean for it is illegal to get the
>> GPU BO address if it is inaccessible (e.g. in the system domain).
>>
>> Could be that some driver relied on the behavior to get 0 for the
>> system domain here.
>
> I wonder how to verify that ?
>
> If I understand correctly:
>
> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in
> system domain.
>
> 2 unfortunately I can't say the same for bochs but it works with this
> patch series so I think bochs is fine as well.
>
> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so
> vmwgfx should be fine.
>
> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true
>
> I am not sure about nouveau as bo->offset is being used in many places.
>
> I could probably mirror the removed logic to nouveau as
I suggest to introduce a ttm helper that contains the original branching
and use it everywhere. Something like
s64 ttm_bo_offset(struct ttm_buffer_object *bo)
{
if (WARN_ON_ONCE(!bo->mem.mm_node))
return 0;
return bo->mem.start << PAGE_SHIFT;
}
Could be static inline. The warning should point to broken drivers. This
also gets rid of the ugly shift in the drivers.
Best regards
Thomas
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
> b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index f8015e0318d7..5a6a2af91318 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object
> *bo, bool evict,
> list_for_each_entry(vma, &nvbo->vma_list, head) {
> nouveau_vma_map(vma, mem);
> }
> + if (bo->mem.mm_node)
> + nvbo->offset = (new_reg->start << PAGE_SHIFT);
> + else
> + nvbo->offset = 0;
> } else {
> list_for_each_entry(vma, &nvbo->vma_list, head) {
> WARN_ON(ttm_bo_wait(bo, false, false));
>
> Regards,
>
> Nirmoy
>
>
>>
>> Regards,
>> Christian.
>>
>>>
>>> Best regards
>>> Thomas
>>>
>>>> ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>> return 0;
>>>> diff --git a/include/drm/ttm/ttm_bo_api.h
>>>> b/include/drm/ttm/ttm_bo_api.h
>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>> * either of these locks held.
>>>> */
>>>> - uint64_t offset; /* GPU address space is independent of CPU
>>>> word size */
>>>> -
>>>> struct sg_table *sg;
>>>> };
>>>> diff --git a/include/drm/ttm/ttm_bo_driver.h
>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>> bool has_type;
>>>> bool use_type;
>>>> uint32_t flags;
>>>> - uint64_t gpu_offset; /* GPU address space is independent of CPU
>>>> word size */
>>>> uint64_t size;
>>>> uint32_t available_caching;
>>>> uint32_t default_caching;
>>>>
>>
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
Attachment:
signature.asc
Description: OpenPGP digital signature
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
