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Date:	Sat, 15 Sep 2012 15:22:44 +0200
From:	Christian König <deathsimple@...afone.de>
To:	Dmitry Cherkasov <dcherkassov@...il.com>
CC:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Alex Deucher <alexander.deucher@....com>,
	Dmitry Cherkassov <Dmitrii.Cherkasov@....com>
Subject: Re: [PATCH 1/2] drm/radeon: refactor set_page chipset interface v2

Looks good in general, some minor comments below:

On 14.09.2012 19:49, Dmitry Cherkasov wrote:
> From: Christian König <deathsimple@...afone.de>
>
> Cleanup the interface in preparation for hierarchical page tables.
> v2: * add incr parameter to set_page for simple scattered PTs uptates
>      * added PDE-specific flags to r600_flags and radeon_drm.h
>      * removed superflous value masking with 0xffffffff
>
> Signed-off-by: Christian König <deathsimple@...afone.de>
> Signed-off-by: Dmitry Cherkassov <Dmitrii.Cherkasov@....com>
> ---
>   drivers/gpu/drm/radeon/ni.c          |   47 ++++++++++++++++++++-----------
>   drivers/gpu/drm/radeon/radeon.h      |   14 +++++-----
>   drivers/gpu/drm/radeon/radeon_asic.h |    6 ++--
>   drivers/gpu/drm/radeon/radeon_gart.c |   51 +++++++++++++---------------------
>   include/drm/radeon_drm.h             |    1 +
>   5 files changed, 62 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
> index b238216..0355c8d 100644
> --- a/drivers/gpu/drm/radeon/ni.c
> +++ b/drivers/gpu/drm/radeon/ni.c
> @@ -1497,6 +1497,7 @@ void cayman_vm_fini(struct radeon_device *rdev)
>   {
>   }
>   
> +#define R600_PDE_VALID     (1 << 0)
>   #define R600_PTE_VALID     (1 << 0)
Why the distinction between R600_PDE_VALID and R600_PTE_VALID?
Just renaming the R600_PTE_* flags sound more sane to me.

>   #define R600_PTE_SYSTEM    (1 << 1)
>   #define R600_PTE_SNOOPED   (1 << 2)
> @@ -1507,6 +1508,7 @@ uint32_t cayman_vm_page_flags(struct radeon_device *rdev, uint32_t flags)
>   {
>   	uint32_t r600_flags = 0;
>   
> +	r600_flags |= (flags & RADEON_VM_PDE_VALID) ? R600_PDE_VALID : 0;
>   	r600_flags |= (flags & RADEON_VM_PAGE_VALID) ? R600_PTE_VALID : 0;
>   	r600_flags |= (flags & RADEON_VM_PAGE_READABLE) ? R600_PTE_READABLE : 0;
>   	r600_flags |= (flags & RADEON_VM_PAGE_WRITEABLE) ? R600_PTE_WRITEABLE : 0;
> @@ -1521,30 +1523,43 @@ uint32_t cayman_vm_page_flags(struct radeon_device *rdev, uint32_t flags)
>    * cayman_vm_set_page - update the page tables using the CP
>    *
>    * @rdev: radeon_device pointer
> + * @pe: addr of the page entry
> + * @addr: dst addr to write into pe
> + * @count: number of page entries to update
> + * @flags: access flags
>    *
>    * Update the page tables using the CP (cayman-si).
>    */
> -void cayman_vm_set_page(struct radeon_device *rdev, struct radeon_vm *vm,
> -			unsigned pfn, struct ttm_mem_reg *mem,
> -			unsigned npages, uint32_t flags)
> +void cayman_vm_set_page(struct radeon_device *rdev, uint64_t pe,
> +			uint64_t addr, unsigned count,
> +			uint32_t flags, uint32_t incr)
>   {
>   	struct radeon_ring *ring = &rdev->ring[rdev->asic->vm.pt_ring_index];
> -	uint64_t addr, pt = vm->pt_gpu_addr + pfn * 8;
> +	uint32_t r600_flags = cayman_vm_page_flags(rdev, flags);
>   	int i;
>   
> -	addr = flags = cayman_vm_page_flags(rdev, flags);
> -
> -	radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, 1 + npages * 2));
> -	radeon_ring_write(ring, pt & 0xffffffff);
> -	radeon_ring_write(ring, (pt >> 32) & 0xff);
> -	for (i = 0; i < npages; ++i) {
> -		if (mem) {
> -			addr = radeon_vm_get_addr(rdev, mem, i);
> -			addr = addr & 0xFFFFFFFFFFFFF000ULL;
> -			addr |= flags;
> +	radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, 1 + count * 2));
> +	radeon_ring_write(ring, pe & 0xffffffff);
> +	radeon_ring_write(ring, (pe >> 32) & 0xff);
> +	for (i = 0; i < count; ++i) {
> +		uint64_t value = 0;
> +		if (flags & RADEON_VM_PAGE_SYSTEM) {
> +			value = radeon_vm_map_gart(rdev, addr);
> +			value &= 0xFFFFFFFFFFFFF000ULL;
> +			addr += RADEON_GPU_PAGE_SIZE;
> +
> +		} else if (flags & RADEON_VM_PAGE_VALID) {
> +			value = addr;
> +			addr += RADEON_GPU_PAGE_SIZE;
> +
> +		} else if (flags & RADEON_VM_PDE_VALID) {
> +			value = addr;
> +			addr += incr;
>   		}
Same here, why the distinction between RADEON_VM_PDE_VALID and 
RADEON_VM_PAGE_VALID?
Additional to that I would also prefer to always use "incr" for both the 
RADEON_VM_PAGE_SYSTEMand the RADEON_VM_PAGE_VALID case.

> -		radeon_ring_write(ring, addr & 0xffffffff);
> -		radeon_ring_write(ring, (addr >> 32) & 0xffffffff);
> +
> +		value |= r600_flags;
> +		radeon_ring_write(ring, value);
> +		radeon_ring_write(ring, (value >> 32));
>   	}
>   }
>   
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index 4d67f0f..f02ea8e 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -1141,9 +1141,9 @@ struct radeon_asic {
>   		void (*fini)(struct radeon_device *rdev);
>   
>   		u32 pt_ring_index;
> -		void (*set_page)(struct radeon_device *rdev, struct radeon_vm *vm,
> -				 unsigned pfn, struct ttm_mem_reg *mem,
> -				 unsigned npages, uint32_t flags);
> +		void (*set_page)
> +		(struct radeon_device *rdev, uint64_t pe,
> +		 uint64_t addr, unsigned count, uint32_t flags, uint32_t incr);
Please don't break the coding style here. Or was it me who did that? 
Anyway keep the indention as it was before.

Additional to that at least I would put the arguments in that order: pe, 
addr then count, incr and last flags.

>   	} vm;
>   	/* ring specific callbacks */
>   	struct {
> @@ -1755,7 +1755,9 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
>   #define radeon_gart_set_page(rdev, i, p) (rdev)->asic->gart.set_page((rdev), (i), (p))
>   #define radeon_asic_vm_init(rdev) (rdev)->asic->vm.init((rdev))
>   #define radeon_asic_vm_fini(rdev) (rdev)->asic->vm.fini((rdev))
> -#define radeon_asic_vm_set_page(rdev, v, pfn, mem, npages, flags) (rdev)->asic->vm.set_page((rdev), (v), (pfn), (mem), (npages), (flags))
> +#define radeon_asic_vm_set_page(rdev, pe, addr, count, flags, incr) \
> +	((rdev)->asic->vm.set_page((rdev), (pe), (addr), \
> +				 (count), (flags), (incr)))
Same here, no idea why we have those macros all on one line. But please 
make it look like the rest of the code.

>   #define radeon_ring_start(rdev, r, cp) (rdev)->asic->ring[(r)].ring_start((rdev), (cp))
>   #define radeon_ring_test(rdev, r, cp) (rdev)->asic->ring[(r)].ring_test((rdev), (cp))
>   #define radeon_ib_test(rdev, r, cp) (rdev)->asic->ring[(r)].ib_test((rdev), (cp))
> @@ -1840,9 +1842,7 @@ struct radeon_fence *radeon_vm_grab_id(struct radeon_device *rdev,
>   void radeon_vm_fence(struct radeon_device *rdev,
>   		     struct radeon_vm *vm,
>   		     struct radeon_fence *fence);
> -u64 radeon_vm_get_addr(struct radeon_device *rdev,
> -                       struct ttm_mem_reg *mem,
> -                       unsigned pfn);
> +uint64_t radeon_vm_map_gart(struct radeon_device *rdev, uint64_t addr);
>   int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>   			    struct radeon_vm *vm,
>   			    struct radeon_bo *bo,
> diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
> index 29b3d05..7166d5f 100644
> --- a/drivers/gpu/drm/radeon/radeon_asic.h
> +++ b/drivers/gpu/drm/radeon/radeon_asic.h
> @@ -442,9 +442,9 @@ int cayman_vm_init(struct radeon_device *rdev);
>   void cayman_vm_fini(struct radeon_device *rdev);
>   void cayman_vm_flush(struct radeon_device *rdev, struct radeon_ib *ib);
>   uint32_t cayman_vm_page_flags(struct radeon_device *rdev, uint32_t flags);
> -void cayman_vm_set_page(struct radeon_device *rdev, struct radeon_vm *vm,
> -			unsigned pfn, struct ttm_mem_reg *mem,
> -			unsigned npages, uint32_t flags);
> +void cayman_vm_set_page(struct radeon_device *rdev, uint64_t pe,
> +			uint64_t addr, unsigned count,
> +			uint32_t flags, uint32_t incr);
>   int evergreen_ib_parse(struct radeon_device *rdev, struct radeon_ib *ib);
>   
>   /* DCE6 - SI */
> diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
> index 2f28ff3..badc835 100644
> --- a/drivers/gpu/drm/radeon/radeon_gart.c
> +++ b/drivers/gpu/drm/radeon/radeon_gart.c
> @@ -822,42 +822,26 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>   }
>   
>   /**
> - * radeon_vm_get_addr - get the physical address of the page
> + * radeon_vm_map_gart - get the physical address of a gart page
>    *
>    * @rdev: radeon_device pointer
> - * @mem: ttm mem
> - * @pfn: pfn
> + * @addr: the unmapped addr
>    *
>    * Look up the physical address of the page that the pte resolves
>    * to (cayman+).
>    * Returns the physical address of the page.
>    */
> -u64 radeon_vm_get_addr(struct radeon_device *rdev,
> -		       struct ttm_mem_reg *mem,
> -		       unsigned pfn)
> +uint64_t radeon_vm_map_gart(struct radeon_device *rdev, uint64_t addr)
>   {
> -	u64 addr = 0;
> -
> -	switch (mem->mem_type) {
> -	case TTM_PL_VRAM:
> -		addr = (mem->start << PAGE_SHIFT);
> -		addr += pfn * RADEON_GPU_PAGE_SIZE;
> -		addr += rdev->vm_manager.vram_base_offset;
> -		break;
> -	case TTM_PL_TT:
> -		/* offset inside page table */
> -		addr = mem->start << PAGE_SHIFT;
> -		addr += pfn * RADEON_GPU_PAGE_SIZE;
> -		addr = addr >> PAGE_SHIFT;
> -		/* page table offset */
> -		addr = rdev->gart.pages_addr[addr];
> -		/* in case cpu page size != gpu page size*/
> -		addr += (pfn * RADEON_GPU_PAGE_SIZE) & (~PAGE_MASK);
> -		break;
> -	default:
> -		break;
> -	}
> -	return addr;
> +	uint64_t result;
> +
> +	/* page table offset */
> +	result = rdev->gart.pages_addr[addr >> PAGE_SHIFT];
> +
> +	/* in case cpu page size != gpu page size*/
> +	result |= addr & (~PAGE_MASK);
> +
> +	return result;
>   }
>   
>   /**
> @@ -883,7 +867,7 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>   	struct radeon_semaphore *sem = NULL;
>   	struct radeon_bo_va *bo_va;
>   	unsigned ngpu_pages, ndw;
> -	uint64_t pfn;
> +	uint64_t pfn, addr;
>   	int r;
>   
>   	/* nothing to do if vm isn't bound */
> @@ -908,21 +892,25 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>   	ngpu_pages = radeon_bo_ngpu_pages(bo);
>   	bo_va->flags &= ~RADEON_VM_PAGE_VALID;
>   	bo_va->flags &= ~RADEON_VM_PAGE_SYSTEM;
> +	pfn = bo_va->soffset / RADEON_GPU_PAGE_SIZE;
>   	if (mem) {
> +		addr = mem->start << PAGE_SHIFT;
>   		if (mem->mem_type != TTM_PL_SYSTEM) {
>   			bo_va->flags |= RADEON_VM_PAGE_VALID;
>   			bo_va->valid = true;
>   		}
>   		if (mem->mem_type == TTM_PL_TT) {
>   			bo_va->flags |= RADEON_VM_PAGE_SYSTEM;
> +		} else {
> +			addr += rdev->vm_manager.vram_base_offset;
>   		}

>   		if (!bo_va->valid) {
>   			mem = NULL;
>   		}
That check and setting mem = NULL is now superfluous, since we don't use 
mem anymore.
Missed that while hacking the initial patch, please just remove.

>   	} else {
> +		addr = 0;
>   		bo_va->valid = false;
>   	}
> -	pfn = bo_va->soffset / RADEON_GPU_PAGE_SIZE;
>   
>   	if (vm->fence && radeon_fence_signaled(vm->fence)) {
>   		radeon_fence_unref(&vm->fence);
> @@ -950,7 +938,8 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>   		radeon_fence_note_sync(vm->fence, ridx);
>   	}
>   
> -	radeon_asic_vm_set_page(rdev, vm, pfn, mem, ngpu_pages, bo_va->flags);
> +	radeon_asic_vm_set_page(rdev, vm->pt_gpu_addr + pfn * 8, addr,
> +				ngpu_pages, bo_va->flags, 0);
>   
>   	radeon_fence_unref(&vm->fence);
>   	r = radeon_fence_emit(rdev, &vm->fence, ridx);
> diff --git a/include/drm/radeon_drm.h b/include/drm/radeon_drm.h
> index dc3a8cd..f36ebe5 100644
> --- a/include/drm/radeon_drm.h
> +++ b/include/drm/radeon_drm.h
> @@ -896,6 +896,7 @@ struct drm_radeon_gem_pwrite {
>   #define RADEON_VM_PAGE_WRITEABLE	(1 << 2)
>   #define RADEON_VM_PAGE_SYSTEM		(1 << 3)
>   #define RADEON_VM_PAGE_SNOOPED		(1 << 4)
> +#define RADEON_VM_PDE_VALID		(1 << 5)
>   
>   struct drm_radeon_gem_va {
>   	uint32_t		handle;

Cheers,
Christian.
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