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Groups > linux.kernel > #1519621 > unrolled thread

[PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations

Started byTvrtko Ursulin <tursulin@ursulin.net>
First post2016-11-11 10:00 +0100
Last post2016-11-14 11:00 +0100
Articles 5 — 2 participants

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Contents

  [PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations Tvrtko Ursulin <tursulin@ursulin.net> - 2016-11-11 10:00 +0100
    [PATCH v3 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations Tvrtko Ursulin <tursulin@ursulin.net> - 2016-11-11 10:00 +0100
    Re: [PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for  userptr allocations Chris Wilson <chris@chris-wilson.co.uk> - 2016-11-11 11:30 +0100
      [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations Tvrtko Ursulin <tursulin@ursulin.net> - 2016-11-11 13:40 +0100
        Re: [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for  userptr allocations Chris Wilson <chris@chris-wilson.co.uk> - 2016-11-14 11:00 +0100

#1519621 — [PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations

FromTvrtko Ursulin <tursulin@ursulin.net>
Date2016-11-11 10:00 +0100
Subject[PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations
Message-ID<sCfQJ-22L-13@gated-at.bofh.it>
From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

With the addition of __sg_alloc_table_from_pages we can control
the maximum coallescing size and eliminate a separate path for
allocating backing store here.

Similar to 871dfbd67d4e ("drm/i915: Allow compaction upto
SWIOTLB max segment size") this enables more compact sg lists to
be created and so has a beneficial effect on workloads with many
and/or large objects of this class.

v2:
 * Rename helper to i915_sg_segment_size and fix swiotlb override.
 * Commit message update.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h         |  9 +++++++++
 drivers/gpu/drm/i915/i915_gem.c         | 15 +--------------
 drivers/gpu/drm/i915/i915_gem_userptr.c | 28 ++++++----------------------
 3 files changed, 16 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 30777dee3f9c..319f8def0f86 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -4175,4 +4175,13 @@ int remap_io_mapping(struct vm_area_struct *vma,
 	__T;								\
 })
 
+static inline unsigned int i915_sg_segment_size(void)
+{
+#if IS_ENABLED(CONFIG_SWIOTLB)
+	return swiotlb_nr_tbl() << IO_TLB_SHIFT;
+#else
+	return UINT_MAX;
+#endif
+}
+
 #endif
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1c20edba7f2a..cb4c188a395c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2223,15 +2223,6 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
 	mutex_unlock(&obj->mm.lock);
 }
 
-static unsigned int swiotlb_max_size(void)
-{
-#if IS_ENABLED(CONFIG_SWIOTLB)
-	return rounddown(swiotlb_nr_tbl() << IO_TLB_SHIFT, PAGE_SIZE);
-#else
-	return 0;
-#endif
-}
-
 static void i915_sg_trim(struct sg_table *orig_st)
 {
 	struct sg_table new_st;
@@ -2267,7 +2258,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
 	struct sgt_iter sgt_iter;
 	struct page *page;
 	unsigned long last_pfn = 0;	/* suppress gcc warning */
-	unsigned int max_segment;
+	unsigned int max_segment = rounddown(i915_sg_segment_size(), PAGE_SIZE);
 	int ret;
 	gfp_t gfp;
 
@@ -2278,10 +2269,6 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
 	GEM_BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
 	GEM_BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
 
-	max_segment = swiotlb_max_size();
-	if (!max_segment)
-		max_segment = rounddown(UINT_MAX, PAGE_SIZE);
-
 	st = kmalloc(sizeof(*st), GFP_KERNEL);
 	if (st == NULL)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 64261639f547..b4461f1832a6 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -390,36 +390,20 @@ struct get_pages_work {
 	struct task_struct *task;
 };
 
-#if IS_ENABLED(CONFIG_SWIOTLB)
-#define swiotlb_active() swiotlb_nr_tbl()
-#else
-#define swiotlb_active() 0
-#endif
-
 static int
 st_set_pages(struct sg_table **st, struct page **pvec, int num_pages)
 {
-	struct scatterlist *sg;
-	int ret, n;
+	int ret;
 
 	*st = kmalloc(sizeof(**st), GFP_KERNEL);
 	if (*st == NULL)
 		return -ENOMEM;
 
-	if (swiotlb_active()) {
-		ret = sg_alloc_table(*st, num_pages, GFP_KERNEL);
-		if (ret)
-			goto err;
-
-		for_each_sg((*st)->sgl, sg, num_pages, n)
-			sg_set_page(sg, pvec[n], PAGE_SIZE, 0);
-	} else {
-		ret = sg_alloc_table_from_pages(*st, pvec, num_pages,
-						0, num_pages << PAGE_SHIFT,
-						GFP_KERNEL);
-		if (ret)
-			goto err;
-	}
+	ret = __sg_alloc_table_from_pages(*st, pvec, num_pages, 0,
+					  num_pages << PAGE_SHIFT,
+					  GFP_KERNEL, i915_sg_segment_size());
+	if (ret)
+		goto err;
 
 	return 0;
 
-- 
2.7.4

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#1519622 — [PATCH v3 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations

FromTvrtko Ursulin <tursulin@ursulin.net>
Date2016-11-11 10:00 +0100
Subject[PATCH v3 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations
Message-ID<sCfQJ-22L-17@gated-at.bofh.it>
In reply to#1519621
From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

With the addition of __sg_alloc_table_from_pages we can control
the maximum coallescing size and eliminate a separate path for
allocating backing store here.

Similar to 871dfbd67d4e ("drm/i915: Allow compaction upto
SWIOTLB max segment size") this enables more compact sg lists to
be created and so has a beneficial effect on workloads with many
and/or large objects of this class.

v2:
 * Rename helper to i915_sg_segment_size and fix swiotlb override.
 * Commit message update.

v3:
 * Actually include the swiotlb override fix.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h         | 11 +++++++++++
 drivers/gpu/drm/i915/i915_gem.c         | 15 +--------------
 drivers/gpu/drm/i915/i915_gem_userptr.c | 28 ++++++----------------------
 3 files changed, 18 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 30777dee3f9c..38a555c9c44b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -4175,4 +4175,15 @@ int remap_io_mapping(struct vm_area_struct *vma,
 	__T;								\
 })
 
+static inline unsigned int i915_sg_segment_size(void)
+{
+#if IS_ENABLED(CONFIG_SWIOTLB)
+	unsigned int nr_tbl = swiotlb_nr_tbl();
+
+	return nr_tbl > 0 ? nr_tbl << IO_TLB_SHIFT : UINT_MAX;
+#else
+	return UINT_MAX;
+#endif
+}
+
 #endif
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1c20edba7f2a..cb4c188a395c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2223,15 +2223,6 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
 	mutex_unlock(&obj->mm.lock);
 }
 
-static unsigned int swiotlb_max_size(void)
-{
-#if IS_ENABLED(CONFIG_SWIOTLB)
-	return rounddown(swiotlb_nr_tbl() << IO_TLB_SHIFT, PAGE_SIZE);
-#else
-	return 0;
-#endif
-}
-
 static void i915_sg_trim(struct sg_table *orig_st)
 {
 	struct sg_table new_st;
@@ -2267,7 +2258,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
 	struct sgt_iter sgt_iter;
 	struct page *page;
 	unsigned long last_pfn = 0;	/* suppress gcc warning */
-	unsigned int max_segment;
+	unsigned int max_segment = rounddown(i915_sg_segment_size(), PAGE_SIZE);
 	int ret;
 	gfp_t gfp;
 
@@ -2278,10 +2269,6 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
 	GEM_BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
 	GEM_BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
 
-	max_segment = swiotlb_max_size();
-	if (!max_segment)
-		max_segment = rounddown(UINT_MAX, PAGE_SIZE);
-
 	st = kmalloc(sizeof(*st), GFP_KERNEL);
 	if (st == NULL)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 64261639f547..b4461f1832a6 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -390,36 +390,20 @@ struct get_pages_work {
 	struct task_struct *task;
 };
 
-#if IS_ENABLED(CONFIG_SWIOTLB)
-#define swiotlb_active() swiotlb_nr_tbl()
-#else
-#define swiotlb_active() 0
-#endif
-
 static int
 st_set_pages(struct sg_table **st, struct page **pvec, int num_pages)
 {
-	struct scatterlist *sg;
-	int ret, n;
+	int ret;
 
 	*st = kmalloc(sizeof(**st), GFP_KERNEL);
 	if (*st == NULL)
 		return -ENOMEM;
 
-	if (swiotlb_active()) {
-		ret = sg_alloc_table(*st, num_pages, GFP_KERNEL);
-		if (ret)
-			goto err;
-
-		for_each_sg((*st)->sgl, sg, num_pages, n)
-			sg_set_page(sg, pvec[n], PAGE_SIZE, 0);
-	} else {
-		ret = sg_alloc_table_from_pages(*st, pvec, num_pages,
-						0, num_pages << PAGE_SHIFT,
-						GFP_KERNEL);
-		if (ret)
-			goto err;
-	}
+	ret = __sg_alloc_table_from_pages(*st, pvec, num_pages, 0,
+					  num_pages << PAGE_SHIFT,
+					  GFP_KERNEL, i915_sg_segment_size());
+	if (ret)
+		goto err;
 
 	return 0;
 
-- 
2.7.4

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#1519673 — Re: [PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations

FromChris Wilson <chris@chris-wilson.co.uk>
Date2016-11-11 11:30 +0100
SubjectRe: [PATCH 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations
Message-ID<sChfQ-35W-37@gated-at.bofh.it>
In reply to#1519621
On Fri, Nov 11, 2016 at 08:50:20AM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> With the addition of __sg_alloc_table_from_pages we can control
> the maximum coallescing size and eliminate a separate path for
> allocating backing store here.
> 
> Similar to 871dfbd67d4e ("drm/i915: Allow compaction upto
> SWIOTLB max segment size") this enables more compact sg lists to
> be created and so has a beneficial effect on workloads with many
> and/or large objects of this class.
> 
> v2:
>  * Rename helper to i915_sg_segment_size and fix swiotlb override.
>  * Commit message update.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/i915_drv.h         |  9 +++++++++
>  drivers/gpu/drm/i915/i915_gem.c         | 15 +--------------
>  drivers/gpu/drm/i915/i915_gem_userptr.c | 28 ++++++----------------------
>  3 files changed, 16 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 30777dee3f9c..319f8def0f86 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -4175,4 +4175,13 @@ int remap_io_mapping(struct vm_area_struct *vma,
>  	__T;								\
>  })
>  
> +static inline unsigned int i915_sg_segment_size(void)
> +{
> +#if IS_ENABLED(CONFIG_SWIOTLB)
> +	return swiotlb_nr_tbl() << IO_TLB_SHIFT;
> +#else
> +	return UINT_MAX;
> +#endif
> +}
> +
>  #endif
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 1c20edba7f2a..cb4c188a395c 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -2223,15 +2223,6 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
>  	mutex_unlock(&obj->mm.lock);
>  }
>  
> -static unsigned int swiotlb_max_size(void)
> -{
> -#if IS_ENABLED(CONFIG_SWIOTLB)
> -	return rounddown(swiotlb_nr_tbl() << IO_TLB_SHIFT, PAGE_SIZE);
> -#else
> -	return 0;
> -#endif
> -}
> -
>  static void i915_sg_trim(struct sg_table *orig_st)
>  {
>  	struct sg_table new_st;
> @@ -2267,7 +2258,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
>  	struct sgt_iter sgt_iter;
>  	struct page *page;
>  	unsigned long last_pfn = 0;	/* suppress gcc warning */
> -	unsigned int max_segment;
> +	unsigned int max_segment = rounddown(i915_sg_segment_size(), PAGE_SIZE);
>  	int ret;
>  	gfp_t gfp;
>  
> @@ -2278,10 +2269,6 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
>  	GEM_BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
>  	GEM_BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
>  
> -	max_segment = swiotlb_max_size();
> -	if (!max_segment)
> -		max_segment = rounddown(UINT_MAX, PAGE_SIZE);
> -
>  	st = kmalloc(sizeof(*st), GFP_KERNEL);
>  	if (st == NULL)
>  		return ERR_PTR(-ENOMEM);
> diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
> index 64261639f547..b4461f1832a6 100644
> --- a/drivers/gpu/drm/i915/i915_gem_userptr.c
> +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
> @@ -390,36 +390,20 @@ struct get_pages_work {
>  	struct task_struct *task;
>  };
>  
> -#if IS_ENABLED(CONFIG_SWIOTLB)
> -#define swiotlb_active() swiotlb_nr_tbl()
> -#else
> -#define swiotlb_active() 0
> -#endif
> -
>  static int
>  st_set_pages(struct sg_table **st, struct page **pvec, int num_pages)
>  {
> -	struct scatterlist *sg;
> -	int ret, n;
> +	int ret;
>  
>  	*st = kmalloc(sizeof(**st), GFP_KERNEL);
>  	if (*st == NULL)
>  		return -ENOMEM;
>  
> -	if (swiotlb_active()) {
> -		ret = sg_alloc_table(*st, num_pages, GFP_KERNEL);
> -		if (ret)
> -			goto err;
> -
> -		for_each_sg((*st)->sgl, sg, num_pages, n)
> -			sg_set_page(sg, pvec[n], PAGE_SIZE, 0);
> -	} else {
> -		ret = sg_alloc_table_from_pages(*st, pvec, num_pages,
> -						0, num_pages << PAGE_SHIFT,
> -						GFP_KERNEL);
> -		if (ret)
> -			goto err;
> -	}
> +	ret = __sg_alloc_table_from_pages(*st, pvec, num_pages, 0,
> +					  num_pages << PAGE_SHIFT,

Petty:

ret = __sg_alloc_table_from_pages(*st, pvec, num_pages,

pvec + num_pages are paired

				  0, num_pages << PAGE_SHIFT,
offset + size are paired

				  i915_sg_segment_size()),
				  GFP_KERNEL);

And for some reason I always like to see gfp_t last.

Otherwise looks good,
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

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#1519765 — [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations

FromTvrtko Ursulin <tursulin@ursulin.net>
Date2016-11-11 13:40 +0100
Subject[PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations
Message-ID<sCjhE-4ky-3@gated-at.bofh.it>
In reply to#1519673
From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

With the addition of __sg_alloc_table_from_pages we can control
the maximum coallescing size and eliminate a separate path for
allocating backing store here.

Similar to 871dfbd67d4e ("drm/i915: Allow compaction upto
SWIOTLB max segment size") this enables more compact sg lists to
be created and so has a beneficial effect on workloads with many
and/or large objects of this class.

v2:
 * Rename helper to i915_sg_segment_size and fix swiotlb override.
 * Commit message update.

v3:
 * Actually include the swiotlb override fix.

v4:
 * Regroup parameters a bit. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
---
 drivers/gpu/drm/i915/i915_drv.h         | 11 +++++++++++
 drivers/gpu/drm/i915/i915_gem.c         | 15 +--------------
 drivers/gpu/drm/i915/i915_gem_userptr.c | 29 +++++++----------------------
 3 files changed, 19 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 30777dee3f9c..38a555c9c44b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -4175,4 +4175,15 @@ int remap_io_mapping(struct vm_area_struct *vma,
 	__T;								\
 })
 
+static inline unsigned int i915_sg_segment_size(void)
+{
+#if IS_ENABLED(CONFIG_SWIOTLB)
+	unsigned int nr_tbl = swiotlb_nr_tbl();
+
+	return nr_tbl > 0 ? nr_tbl << IO_TLB_SHIFT : UINT_MAX;
+#else
+	return UINT_MAX;
+#endif
+}
+
 #endif
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1c20edba7f2a..cb4c188a395c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2223,15 +2223,6 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
 	mutex_unlock(&obj->mm.lock);
 }
 
-static unsigned int swiotlb_max_size(void)
-{
-#if IS_ENABLED(CONFIG_SWIOTLB)
-	return rounddown(swiotlb_nr_tbl() << IO_TLB_SHIFT, PAGE_SIZE);
-#else
-	return 0;
-#endif
-}
-
 static void i915_sg_trim(struct sg_table *orig_st)
 {
 	struct sg_table new_st;
@@ -2267,7 +2258,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
 	struct sgt_iter sgt_iter;
 	struct page *page;
 	unsigned long last_pfn = 0;	/* suppress gcc warning */
-	unsigned int max_segment;
+	unsigned int max_segment = rounddown(i915_sg_segment_size(), PAGE_SIZE);
 	int ret;
 	gfp_t gfp;
 
@@ -2278,10 +2269,6 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
 	GEM_BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
 	GEM_BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
 
-	max_segment = swiotlb_max_size();
-	if (!max_segment)
-		max_segment = rounddown(UINT_MAX, PAGE_SIZE);
-
 	st = kmalloc(sizeof(*st), GFP_KERNEL);
 	if (st == NULL)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 64261639f547..f3fcb2d1bde9 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -390,36 +390,21 @@ struct get_pages_work {
 	struct task_struct *task;
 };
 
-#if IS_ENABLED(CONFIG_SWIOTLB)
-#define swiotlb_active() swiotlb_nr_tbl()
-#else
-#define swiotlb_active() 0
-#endif
-
 static int
 st_set_pages(struct sg_table **st, struct page **pvec, int num_pages)
 {
-	struct scatterlist *sg;
-	int ret, n;
+	int ret;
 
 	*st = kmalloc(sizeof(**st), GFP_KERNEL);
 	if (*st == NULL)
 		return -ENOMEM;
 
-	if (swiotlb_active()) {
-		ret = sg_alloc_table(*st, num_pages, GFP_KERNEL);
-		if (ret)
-			goto err;
-
-		for_each_sg((*st)->sgl, sg, num_pages, n)
-			sg_set_page(sg, pvec[n], PAGE_SIZE, 0);
-	} else {
-		ret = sg_alloc_table_from_pages(*st, pvec, num_pages,
-						0, num_pages << PAGE_SHIFT,
-						GFP_KERNEL);
-		if (ret)
-			goto err;
-	}
+	ret = __sg_alloc_table_from_pages(*st, pvec, num_pages,
+					  0, num_pages << PAGE_SHIFT,
+					  i915_sg_segment_size(),
+					  GFP_KERNEL);
+	if (ret)
+		goto err;
 
 	return 0;
 
-- 
2.7.4

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#1521466 — Re: [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations

FromChris Wilson <chris@chris-wilson.co.uk>
Date2016-11-14 11:00 +0100
SubjectRe: [PATCH v4 4/4] drm/i915: Use __sg_alloc_table_from_pages for userptr allocations
Message-ID<sDmdr-5fH-9@gated-at.bofh.it>
In reply to#1519765
On Fri, Nov 11, 2016 at 12:36:13PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> With the addition of __sg_alloc_table_from_pages we can control
> the maximum coallescing size and eliminate a separate path for
> allocating backing store here.
> 
> Similar to 871dfbd67d4e ("drm/i915: Allow compaction upto
> SWIOTLB max segment size") this enables more compact sg lists to
> be created and so has a beneficial effect on workloads with many
> and/or large objects of this class.
> 
> v2:
>  * Rename helper to i915_sg_segment_size and fix swiotlb override.
>  * Commit message update.
> 
> v3:
>  * Actually include the swiotlb override fix.
> 
> v4:
>  * Regroup parameters a bit. (Chris Wilson)
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
(bump)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

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