Re: [PATCH 4/9] [v3] drm/i915: Make clear/insert vfuncs args absolute

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On Thu, 2014-02-20 at 11:50 -0800, Ben Widawsky wrote:
> This patch converts insert_entries and clear_range, both functions which
> are specific to the VM. These functions tend to encapsulate the gen
> specific PTE writes. Passing absolute addresses to the insert_entries,
> and clear_range will help make the logic clearer within the functions as
> to what's going on. Currently, all callers simply do the appropriate
> page shift, which IMO, ends up looking weird with an upcoming change for
> the gen8 page table allocations.
> 
> Up until now, the PPGTT was a funky 2 level page table. GEN8 changes
> this to look more like a 3 level page table, and to that extent we need
> a significant amount more memory simply for the page tables. To address
> this, the allocations will be split up in finer amounts.
> 
> v2: Replace size_t with uint64_t (Chris, Imre)
> 
> v3: Fix size in gen8_ppgtt_init (Ben)
> Fix Size in i915_gem_suspend_gtt_mappings/restore (Imre)
> 
> Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx> (v2)
> Signed-off-by: Ben Widawsky <ben@xxxxxxxxxxxx>

Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>

> ---
>  drivers/gpu/drm/i915/i915_drv.h     |  6 +--
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 90 +++++++++++++++++++++----------------
>  2 files changed, 54 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 57556fb..ab23bfd 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -652,12 +652,12 @@ struct i915_address_space {
>  				     enum i915_cache_level level,
>  				     bool valid); /* Create a valid PTE */
>  	void (*clear_range)(struct i915_address_space *vm,
> -			    unsigned int first_entry,
> -			    unsigned int num_entries,
> +			    uint64_t start,
> +			    uint64_t length,
>  			    bool use_scratch);
>  	void (*insert_entries)(struct i915_address_space *vm,
>  			       struct sg_table *st,
> -			       unsigned int first_entry,
> +			       uint64_t start,
>  			       enum i915_cache_level cache_level);
>  	void (*cleanup)(struct i915_address_space *vm);
>  };
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index beca571..03a3871 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -254,13 +254,15 @@ static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt,
>  }
>  
>  static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
> -				   unsigned first_entry,
> -				   unsigned num_entries,
> +				   uint64_t start,
> +				   uint64_t length,
>  				   bool use_scratch)
>  {
>  	struct i915_hw_ppgtt *ppgtt =
>  		container_of(vm, struct i915_hw_ppgtt, base);
>  	gen8_gtt_pte_t *pt_vaddr, scratch_pte;
> +	unsigned first_entry = start >> PAGE_SHIFT;
> +	unsigned num_entries = length >> PAGE_SHIFT;
>  	unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
>  	unsigned first_pte = first_entry % GEN8_PTES_PER_PAGE;
>  	unsigned last_pte, i;
> @@ -290,12 +292,13 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
>  
>  static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
>  				      struct sg_table *pages,
> -				      unsigned first_entry,
> +				      uint64_t start,
>  				      enum i915_cache_level cache_level)
>  {
>  	struct i915_hw_ppgtt *ppgtt =
>  		container_of(vm, struct i915_hw_ppgtt, base);
>  	gen8_gtt_pte_t *pt_vaddr;
> +	unsigned first_entry = start >> PAGE_SHIFT;
>  	unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
>  	unsigned act_pte = first_entry % GEN8_PTES_PER_PAGE;
>  	struct sg_page_iter sg_iter;
> @@ -539,7 +542,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
>  	ppgtt->base.total = ppgtt->num_pt_pages * GEN8_PTES_PER_PAGE * PAGE_SIZE;
>  
>  	ppgtt->base.clear_range(&ppgtt->base, 0,
> -				ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE,
> +				ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE * PAGE_SIZE,
>  				true);
>  
>  	DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
> @@ -854,13 +857,15 @@ static int gen6_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
>  
>  /* PPGTT support for Sandybdrige/Gen6 and later */
>  static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
> -				   unsigned first_entry,
> -				   unsigned num_entries,
> +				   uint64_t start,
> +				   uint64_t length,
>  				   bool use_scratch)
>  {
>  	struct i915_hw_ppgtt *ppgtt =
>  		container_of(vm, struct i915_hw_ppgtt, base);
>  	gen6_gtt_pte_t *pt_vaddr, scratch_pte;
> +	unsigned first_entry = start >> PAGE_SHIFT;
> +	unsigned num_entries = length >> PAGE_SHIFT;
>  	unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
>  	unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
>  	unsigned last_pte, i;
> @@ -887,12 +892,13 @@ static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
>  
>  static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
>  				      struct sg_table *pages,
> -				      unsigned first_entry,
> +				      uint64_t start,
>  				      enum i915_cache_level cache_level)
>  {
>  	struct i915_hw_ppgtt *ppgtt =
>  		container_of(vm, struct i915_hw_ppgtt, base);
>  	gen6_gtt_pte_t *pt_vaddr;
> +	unsigned first_entry = start >> PAGE_SHIFT;
>  	unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
>  	unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
>  	struct sg_page_iter sg_iter;
> @@ -1024,8 +1030,7 @@ alloc:
>  		ppgtt->pt_dma_addr[i] = pt_addr;
>  	}
>  
> -	ppgtt->base.clear_range(&ppgtt->base, 0,
> -				ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES, true);
> +	ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
>  	ppgtt->debug_dump = gen6_dump_ppgtt;
>  
>  	DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n",
> @@ -1089,20 +1094,17 @@ ppgtt_bind_vma(struct i915_vma *vma,
>  	       enum i915_cache_level cache_level,
>  	       u32 flags)
>  {
> -	const unsigned long entry = vma->node.start >> PAGE_SHIFT;
> -
>  	WARN_ON(flags);
>  
> -	vma->vm->insert_entries(vma->vm, vma->obj->pages, entry, cache_level);
> +	vma->vm->insert_entries(vma->vm, vma->obj->pages, vma->node.start,
> +				cache_level);
>  }
>  
>  static void ppgtt_unbind_vma(struct i915_vma *vma)
>  {
> -	const unsigned long entry = vma->node.start >> PAGE_SHIFT;
> -
>  	vma->vm->clear_range(vma->vm,
> -			     entry,
> -			     vma->obj->base.size >> PAGE_SHIFT,
> +			     vma->node.start,
> +			     vma->obj->base.size,
>  			     true);
>  }
>  
> @@ -1186,8 +1188,8 @@ void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
>  	i915_check_and_clear_faults(dev);
>  
>  	dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
> -				       dev_priv->gtt.base.start / PAGE_SIZE,
> -				       dev_priv->gtt.base.total / PAGE_SIZE,
> +				       dev_priv->gtt.base.start,
> +				       dev_priv->gtt.base.total,
>  				       false);
>  }
>  
> @@ -1201,8 +1203,8 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
>  
>  	/* First fill our portion of the GTT with scratch pages */
>  	dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
> -				       dev_priv->gtt.base.start / PAGE_SIZE,
> -				       dev_priv->gtt.base.total / PAGE_SIZE,
> +				       dev_priv->gtt.base.start,
> +				       dev_priv->gtt.base.total,
>  				       true);
>  
>  	list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
> @@ -1263,10 +1265,11 @@ static inline void gen8_set_pte(void __iomem *addr, gen8_gtt_pte_t pte)
>  
>  static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
>  				     struct sg_table *st,
> -				     unsigned int first_entry,
> +				     uint64_t start,
>  				     enum i915_cache_level level)
>  {
>  	struct drm_i915_private *dev_priv = vm->dev->dev_private;
> +	unsigned first_entry = start >> PAGE_SHIFT;
>  	gen8_gtt_pte_t __iomem *gtt_entries =
>  		(gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
>  	int i = 0;
> @@ -1308,10 +1311,11 @@ static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
>   */
>  static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
>  				     struct sg_table *st,
> -				     unsigned int first_entry,
> +				     uint64_t start,
>  				     enum i915_cache_level level)
>  {
>  	struct drm_i915_private *dev_priv = vm->dev->dev_private;
> +	unsigned first_entry = start >> PAGE_SHIFT;
>  	gen6_gtt_pte_t __iomem *gtt_entries =
>  		(gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
>  	int i = 0;
> @@ -1343,11 +1347,13 @@ static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
>  }
>  
>  static void gen8_ggtt_clear_range(struct i915_address_space *vm,
> -				  unsigned int first_entry,
> -				  unsigned int num_entries,
> +				  uint64_t start,
> +				  uint64_t length,
>  				  bool use_scratch)
>  {
>  	struct drm_i915_private *dev_priv = vm->dev->dev_private;
> +	unsigned first_entry = start >> PAGE_SHIFT;
> +	unsigned num_entries = length >> PAGE_SHIFT;
>  	gen8_gtt_pte_t scratch_pte, __iomem *gtt_base =
>  		(gen8_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
>  	const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
> @@ -1367,11 +1373,13 @@ static void gen8_ggtt_clear_range(struct i915_address_space *vm,
>  }
>  
>  static void gen6_ggtt_clear_range(struct i915_address_space *vm,
> -				  unsigned int first_entry,
> -				  unsigned int num_entries,
> +				  uint64_t start,
> +				  uint64_t length,
>  				  bool use_scratch)
>  {
>  	struct drm_i915_private *dev_priv = vm->dev->dev_private;
> +	unsigned first_entry = start >> PAGE_SHIFT;
> +	unsigned num_entries = length >> PAGE_SHIFT;
>  	gen6_gtt_pte_t scratch_pte, __iomem *gtt_base =
>  		(gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
>  	const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
> @@ -1404,10 +1412,12 @@ static void i915_ggtt_bind_vma(struct i915_vma *vma,
>  }
>  
>  static void i915_ggtt_clear_range(struct i915_address_space *vm,
> -				  unsigned int first_entry,
> -				  unsigned int num_entries,
> +				  uint64_t start,
> +				  uint64_t length,
>  				  bool unused)
>  {
> +	unsigned first_entry = start >> PAGE_SHIFT;
> +	unsigned num_entries = length >> PAGE_SHIFT;
>  	intel_gtt_clear_range(first_entry, num_entries);
>  }
>  
> @@ -1428,7 +1438,6 @@ static void ggtt_bind_vma(struct i915_vma *vma,
>  	struct drm_device *dev = vma->vm->dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct drm_i915_gem_object *obj = vma->obj;
> -	const unsigned long entry = vma->node.start >> PAGE_SHIFT;
>  
>  	/* If there is no aliasing PPGTT, or the caller needs a global mapping,
>  	 * or we have a global mapping already but the cacheability flags have
> @@ -1444,7 +1453,8 @@ static void ggtt_bind_vma(struct i915_vma *vma,
>  	if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) {
>  		if (!obj->has_global_gtt_mapping ||
>  		    (cache_level != obj->cache_level)) {
> -			vma->vm->insert_entries(vma->vm, obj->pages, entry,
> +			vma->vm->insert_entries(vma->vm, obj->pages,
> +						vma->node.start,
>  						cache_level);
>  			obj->has_global_gtt_mapping = 1;
>  		}
> @@ -1455,7 +1465,9 @@ static void ggtt_bind_vma(struct i915_vma *vma,
>  	     (cache_level != obj->cache_level))) {
>  		struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
>  		appgtt->base.insert_entries(&appgtt->base,
> -					    vma->obj->pages, entry, cache_level);
> +					    vma->obj->pages,
> +					    vma->node.start,
> +					    cache_level);
>  		vma->obj->has_aliasing_ppgtt_mapping = 1;
>  	}
>  }
> @@ -1465,11 +1477,11 @@ static void ggtt_unbind_vma(struct i915_vma *vma)
>  	struct drm_device *dev = vma->vm->dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct drm_i915_gem_object *obj = vma->obj;
> -	const unsigned long entry = vma->node.start >> PAGE_SHIFT;
>  
>  	if (obj->has_global_gtt_mapping) {
> -		vma->vm->clear_range(vma->vm, entry,
> -				     vma->obj->base.size >> PAGE_SHIFT,
> +		vma->vm->clear_range(vma->vm,
> +				     vma->node.start,
> +				     obj->base.size,
>  				     true);
>  		obj->has_global_gtt_mapping = 0;
>  	}
> @@ -1477,8 +1489,8 @@ static void ggtt_unbind_vma(struct i915_vma *vma)
>  	if (obj->has_aliasing_ppgtt_mapping) {
>  		struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
>  		appgtt->base.clear_range(&appgtt->base,
> -					 entry,
> -					 obj->base.size >> PAGE_SHIFT,
> +					 vma->node.start,
> +					 obj->base.size,
>  					 true);
>  		obj->has_aliasing_ppgtt_mapping = 0;
>  	}
> @@ -1563,14 +1575,14 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
>  
>  	/* Clear any non-preallocated blocks */
>  	drm_mm_for_each_hole(entry, &ggtt_vm->mm, hole_start, hole_end) {
> -		const unsigned long count = (hole_end - hole_start) / PAGE_SIZE;
>  		DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n",
>  			      hole_start, hole_end);
> -		ggtt_vm->clear_range(ggtt_vm, hole_start / PAGE_SIZE, count, true);
> +		ggtt_vm->clear_range(ggtt_vm, hole_start,
> +				     hole_end - hole_start, true);
>  	}
>  
>  	/* And finally clear the reserved guard page */
> -	ggtt_vm->clear_range(ggtt_vm, end / PAGE_SIZE - 1, 1, true);
> +	ggtt_vm->clear_range(ggtt_vm, end - PAGE_SIZE, PAGE_SIZE, true);
>  }
>  
>  void i915_gem_init_global_gtt(struct drm_device *dev)

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