Re: [PATCH 06/16] drm/amdgpu: accommodate DOMAIN/PL_DOORBELL

[Shashank Sharma <shashank.sharma@xxxxxxx>]

On 30/03/2023 16:12, Luben Tuikov wrote:
> On 2023-03-30 09:48, Shashank Sharma wrote:
> > On 30/03/2023 15:45, Luben Tuikov wrote:
> > > On 2023-03-30 09:43, Shashank Sharma wrote:
> > > > On 30/03/2023 15:33, Luben Tuikov wrote:
> > > > > On 2023-03-30 07:14, Christian König wrote:
> > > > > > Am 29.03.23 um 17:47 schrieb Shashank Sharma:
> > > > > > > From: Alex Deucher <alexander.deucher@xxxxxxx>
> > > > > > >
> > > > > > > This patch adds changes:
> > > > > > > - to accommodate the new GEM domain DOORBELL
> > > > > > > - to accommodate the new TTM PL DOORBELL
> > > > > > >
> > > > > > > in order to manage doorbell pages as GEM object.
> > > > > > >
> > > > > > > V2: Addressed reviwe comments from Christian
> > > > > > >         - drop the doorbell changes for pinning/unpinning
> > > > > > >         - drop the doorbell changes for dma-buf map
> > > > > > >         - drop the doorbell changes for sgt
> > > > > > >         - no need to handle TTM_PL_FLAG_CONTIGUOUS for doorbell
> > > > > > >         - add caching type for doorbell
> > > > > > >
> > > > > > > Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> > > > > > > Cc: Christian Koenig <christian.koenig@xxxxxxx>
> > > > > > >
> > > > > > > Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> > > > > > > Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
> > > > > Generally there are no empty lines in the tag list. Perhaps remove it?
> > > > I would prefer to keep it, to highlight the CC parts.
> > > I've never seen a commit with them separated. Perhaps follow Linux custom?
> > IIRC This is not against Linux patch formatting/message body guidelines.
> The tag list forms a block, a paragraph, which is easy to scan and separate out
> of the description of the patch, which in itself can have many paragraphs separated
> by white lines: subject line, paragraph 1, paragraph 2, ..., paragraph of tags.
> Furthermore these tags are added/appended by automated scripts/tools which wouldn't
> add an empty line.
>
> Check out the following resources:
> https://www.kernel.org/doc/html/v4.12/process/5.Posting.html#patch-formatting-and-changelogs
> https://www.kernel.org/doc/html/v4.12/process/submitting-patches.html#the-canonical-patch-format
>
> "git log -- drivers/gpu/drm/." is also a very helpful reference to see some good patch formatting.
>
> Please remove the empty line between the Cc and Sob lines, so it forms a tag paragraph.

Certainly makes sense, agreed.

- Shashank

> Regards,
> Luben
>
>
> > - Shashank
> >
> > > Regards,
> > > Luben
> > >
> > > > - Shashank
> > > >
> > > > > Regards,
> > > > > Luben
> > > > >
> > > > > > > ---
> > > > > > >      drivers/gpu/drm/amd/amdgpu/amdgpu_object.c     | 11 ++++++++++-
> > > > > > >      drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h |  2 ++
> > > > > > >      drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c        | 16 +++++++++++++++-
> > > > > > >      drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h        |  1 +
> > > > > > >      4 files changed, 28 insertions(+), 2 deletions(-)
> > > > > > >
> > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> > > > > > > index 4e684c2afc70..0ec080e240ad 100644
> > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> > > > > > > @@ -147,6 +147,14 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
> > > > > > >      		c++;
> > > > > > >      	}
> > > > > > >      
> > > > > > > +	if (domain & AMDGPU_GEM_DOMAIN_DOORBELL) {
> > > > > > > +		places[c].fpfn = 0;
> > > > > > > +		places[c].lpfn = 0;
> > > > > > > +		places[c].mem_type = AMDGPU_PL_DOORBELL;
> > > > > > > +		places[c].flags = 0;
> > > > > > > +		c++;
> > > > > > > +	}
> > > > > > > +
> > > > > > >      	if (domain & AMDGPU_GEM_DOMAIN_GTT) {
> > > > > > >      		places[c].fpfn = 0;
> > > > > > >      		places[c].lpfn = 0;
> > > > > > > @@ -466,7 +474,7 @@ static bool amdgpu_bo_validate_size(struct amdgpu_device *adev,
> > > > > > >      		goto fail;
> > > > > > >      	}
> > > > > > >      
> > > > > > > -	/* TODO add more domains checks, such as AMDGPU_GEM_DOMAIN_CPU */
> > > > > > > +	/* TODO add more domains checks, such as AMDGPU_GEM_DOMAIN_CPU,  AMDGPU_GEM_DOMAIN_DOORBELL */
> > > > > > >      	return true;
> > > > > > >      
> > > > > > >      fail:
> > > > > > > @@ -1013,6 +1021,7 @@ void amdgpu_bo_unpin(struct amdgpu_bo *bo)
> > > > > > >      	} else if (bo->tbo.resource->mem_type == TTM_PL_TT) {
> > > > > > >      		atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
> > > > > > >      	}
> > > > > > > +
> > > > > > Unrelated newline, probably just a leftover.
> > > > > >
> > > > > > Apart from that the patch is Reviewed-by: Christian König
> > > > > > <christian.koenig@xxxxxxx>
> > > > > >
> > > > > > Regards,
> > > > > > Christian.
> > > > > >
> > > > > > >      }
> > > > > > >      
> > > > > > >      static const char *amdgpu_vram_names[] = {
> > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> > > > > > > index 5c4f93ee0c57..3c988cc406e4 100644
> > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> > > > > > > @@ -90,6 +90,7 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
> > > > > > >      		cur->node = block;
> > > > > > >      		break;
> > > > > > >      	case TTM_PL_TT:
> > > > > > > +	case AMDGPU_PL_DOORBELL:
> > > > > > >      		node = to_ttm_range_mgr_node(res)->mm_nodes;
> > > > > > >      		while (start >= node->size << PAGE_SHIFT)
> > > > > > >      			start -= node++->size << PAGE_SHIFT;
> > > > > > > @@ -152,6 +153,7 @@ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size)
> > > > > > >      		cur->size = min(amdgpu_vram_mgr_block_size(block), cur->remaining);
> > > > > > >      		break;
> > > > > > >      	case TTM_PL_TT:
> > > > > > > +	case AMDGPU_PL_DOORBELL:
> > > > > > >      		node = cur->node;
> > > > > > >      
> > > > > > >      		cur->node = ++node;
> > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > > > > > > index 55e0284b2bdd..6f61491ef3dd 100644
> > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > > > > > > @@ -128,6 +128,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
> > > > > > >      	case AMDGPU_PL_GDS:
> > > > > > >      	case AMDGPU_PL_GWS:
> > > > > > >      	case AMDGPU_PL_OA:
> > > > > > > +	case AMDGPU_PL_DOORBELL:
> > > > > > >      		placement->num_placement = 0;
> > > > > > >      		placement->num_busy_placement = 0;
> > > > > > >      		return;
> > > > > > > @@ -500,9 +501,11 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> > > > > > >      	if (old_mem->mem_type == AMDGPU_PL_GDS ||
> > > > > > >      	    old_mem->mem_type == AMDGPU_PL_GWS ||
> > > > > > >      	    old_mem->mem_type == AMDGPU_PL_OA ||
> > > > > > > +	    old_mem->mem_type == AMDGPU_PL_DOORBELL ||
> > > > > > >      	    new_mem->mem_type == AMDGPU_PL_GDS ||
> > > > > > >      	    new_mem->mem_type == AMDGPU_PL_GWS ||
> > > > > > > -	    new_mem->mem_type == AMDGPU_PL_OA) {
> > > > > > > +	    new_mem->mem_type == AMDGPU_PL_OA ||
> > > > > > > +	    new_mem->mem_type == AMDGPU_PL_DOORBELL) {
> > > > > > >      		/* Nothing to save here */
> > > > > > >      		ttm_bo_move_null(bo, new_mem);
> > > > > > >      		goto out;
> > > > > > > @@ -586,6 +589,12 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_device *bdev,
> > > > > > >      		mem->bus.offset += adev->gmc.aper_base;
> > > > > > >      		mem->bus.is_iomem = true;
> > > > > > >      		break;
> > > > > > > +	case AMDGPU_PL_DOORBELL:
> > > > > > > +		mem->bus.offset = mem->start << PAGE_SHIFT;
> > > > > > > +		mem->bus.offset += adev->doorbell.base;
> > > > > > > +		mem->bus.is_iomem = true;
> > > > > > > +		mem->bus.caching = ttm_uncached;
> > > > > > > +		break;
> > > > > > >      	default:
> > > > > > >      		return -EINVAL;
> > > > > > >      	}
> > > > > > > @@ -600,6 +609,10 @@ static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
> > > > > > >      
> > > > > > >      	amdgpu_res_first(bo->resource, (u64)page_offset << PAGE_SHIFT, 0,
> > > > > > >      			 &cursor);
> > > > > > > +
> > > > > > > +	if (bo->resource->mem_type == AMDGPU_PL_DOORBELL)
> > > > > > > +		return ((uint64_t)(adev->doorbell.base + cursor.start)) >> PAGE_SHIFT;
> > > > > > > +
> > > > > > >      	return (adev->gmc.aper_base + cursor.start) >> PAGE_SHIFT;
> > > > > > >      }
> > > > > > >      
> > > > > > > @@ -1267,6 +1280,7 @@ uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_resource *mem)
> > > > > > >      		flags |= AMDGPU_PTE_VALID;
> > > > > > >      
> > > > > > >      	if (mem && (mem->mem_type == TTM_PL_TT ||
> > > > > > > +		    mem->mem_type == AMDGPU_PL_DOORBELL ||
> > > > > > >      		    mem->mem_type == AMDGPU_PL_PREEMPT)) {
> > > > > > >      		flags |= AMDGPU_PTE_SYSTEM;
> > > > > > >      
> > > > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> > > > > > > index e2cd5894afc9..761cd6b2b942 100644
> > > > > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> > > > > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> > > > > > > @@ -33,6 +33,7 @@
> > > > > > >      #define AMDGPU_PL_GWS		(TTM_PL_PRIV + 1)
> > > > > > >      #define AMDGPU_PL_OA		(TTM_PL_PRIV + 2)
> > > > > > >      #define AMDGPU_PL_PREEMPT	(TTM_PL_PRIV + 3)
> > > > > > > +#define AMDGPU_PL_DOORBELL	(TTM_PL_PRIV + 4)
> > > > > > >      
> > > > > > >      #define AMDGPU_GTT_MAX_TRANSFER_SIZE	512
> > > > > > >      #define AMDGPU_GTT_NUM_TRANSFER_WINDOWS	2