On Tue, Sep 11, 2018 at 04:14:39PM +0100, Chris Wilson wrote:
> Whilst reviewing another new user of stolen memory, Ville made the
> observation that we should try to ensure that all permanent allocations
> within stolen memory are clustered together at either end of the stolen
> region, in order to reduce fragmentation. In the depths of
> i915_gem_stolen.c it is not always clear what manner of allocation we
> need, so expose the drm_mm search parameter and push the decision to our
> callers.
>
> Suggested-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 15 +++++++++------
> drivers/gpu/drm/i915/i915_gem_stolen.c | 19 ++++++++++++-------
> drivers/gpu/drm/i915/intel_engine_cs.c | 3 ++-
> drivers/gpu/drm/i915/intel_fbc.c | 13 ++++++++-----
> drivers/gpu/drm/i915/intel_fbdev.c | 3 ++-
> drivers/gpu/drm/i915/intel_overlay.c | 3 ++-
> drivers/gpu/drm/i915/intel_pm.c | 3 ++-
> drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +-
> 8 files changed, 38 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 7ea442033a57..e68102141067 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3302,19 +3302,22 @@ static inline void i915_gem_chipset_flush(struct
> drm_i915_private *dev_priv)
>
> /* i915_gem_stolen.c */
> int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
> - struct drm_mm_node *node, u64 size,
> - unsigned alignment);
> + struct drm_mm_node *node,
> + u64 size, unsigned int alignment,
> + unsigned int search);
> int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
> - struct drm_mm_node *node, u64 size,
> - unsigned alignment, u64 start,
> - u64 end);
> + struct drm_mm_node *node,
> + u64 size, unsigned int alignment,
> + u64 start, u64 end,
> + unsigned int search);
> void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
> struct drm_mm_node *node);
> int i915_gem_init_stolen(struct drm_i915_private *dev_priv);
> void i915_gem_cleanup_stolen(struct drm_device *dev);
> struct drm_i915_gem_object *
> i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
> - resource_size_t size);
> + resource_size_t size,
> + unsigned int search);
> struct drm_i915_gem_object *
> i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private
> *dev_priv,
> resource_size_t stolen_offset,
> diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c
> b/drivers/gpu/drm/i915/i915_gem_stolen.c
> index 53440bf87650..ed440e280dd0 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -43,8 +43,10 @@
> */
>
> int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
> - struct drm_mm_node *node, u64 size,
> - unsigned alignment, u64 start, u64 end)
> + struct drm_mm_node *node,
> + u64 size, unsigned int alignment,
> + u64 start, u64 end,
> + unsigned int search)
> {
> int ret;
>
> @@ -58,7 +60,7 @@ int i915_gem_stolen_insert_node_in_range(struct
> drm_i915_private *dev_priv,
> mutex_lock(&dev_priv->mm.stolen_lock);
> ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
> size, alignment, 0,
> - start, end, DRM_MM_INSERT_BEST);
> + start, end, search);
> mutex_unlock(&dev_priv->mm.stolen_lock);
>
> return ret;
> @@ -66,10 +68,12 @@ int i915_gem_stolen_insert_node_in_range(struct
> drm_i915_private *dev_priv,
>
> int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
> struct drm_mm_node *node, u64 size,
> - unsigned alignment)
> + unsigned int alignment,
> + unsigned int search)
> {
> return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
> - alignment, 0, U64_MAX);
> + alignment, 0, U64_MAX,
> + search);
> }
>
> void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
> @@ -591,7 +595,8 @@ _i915_gem_object_create_stolen(struct drm_i915_private
> *dev_priv,
>
> struct drm_i915_gem_object *
> i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
> - resource_size_t size)
> + resource_size_t size,
> + unsigned int search)
> {
> struct drm_i915_gem_object *obj;
> struct drm_mm_node *stolen;
> @@ -607,7 +612,7 @@ i915_gem_object_create_stolen(struct drm_i915_private
> *dev_priv,
> if (!stolen)
> return NULL;
>
> - ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
> + ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096, search);
> if (ret) {
> kfree(stolen);
> return NULL;
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
> b/drivers/gpu/drm/i915/intel_engine_cs.c
> index 10cd051ba29e..c945a9fb54ae 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -499,7 +499,8 @@ int intel_engine_create_scratch(struct intel_engine_cs
> *engine,
>
> WARN_ON(engine->scratch);
>
> - obj = i915_gem_object_create_stolen(engine->i915, size);
> + obj = i915_gem_object_create_stolen(engine->i915,
> + size, DRM_MM_INSERT_LOW);
> if (!obj)
> obj = i915_gem_object_create_internal(engine->i915, size);
> if (IS_ERR(obj)) {
> diff --git a/drivers/gpu/drm/i915/intel_fbc.c
> b/drivers/gpu/drm/i915/intel_fbc.c
> index 01d1d2088f04..bf62d3d08e82 100644
> --- a/drivers/gpu/drm/i915/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/intel_fbc.c
> @@ -457,8 +457,9 @@ static int find_compression_threshold(struct
> drm_i915_private *dev_priv,
> */
>
> /* Try to over-allocate to reduce reallocations and fragmentation. */
> - ret = i915_gem_stolen_insert_node_in_range(dev_priv, node, size <<= 1,
> - 4096, 0, end);
> + ret = i915_gem_stolen_insert_node_in_range(dev_priv, node,
> + size <<= 1, 4096,
> + 0, end, DRM_MM_INSERT_BEST);
> if (ret == 0)
> return compression_threshold;
>
> @@ -468,8 +469,9 @@ static int find_compression_threshold(struct
> drm_i915_private *dev_priv,
> (fb_cpp == 2 && compression_threshold == 2))
> return 0;
>
> - ret = i915_gem_stolen_insert_node_in_range(dev_priv, node, size >>= 1,
> - 4096, 0, end);
> + ret = i915_gem_stolen_insert_node_in_range(dev_priv, node,
> + size >>= 1, 4096,
> + 0, end, DRM_MM_INSERT_BEST);
> if (ret && INTEL_GEN(dev_priv) <= 4) {
> return 0;
> } else if (ret) {
> @@ -513,7 +515,8 @@ static int intel_fbc_alloc_cfb(struct intel_crtc *crtc)
> goto err_fb;
>
> ret = i915_gem_stolen_insert_node(dev_priv, compressed_llb,
> - 4096, 4096);
> + 4096, 4096,
> + DRM_MM_INSERT_LOW);
We seem to alloc/free the line length buffer alongside the cfb.
So should this use best instead?
> if (ret)
> goto err_fb;
>
> diff --git a/drivers/gpu/drm/i915/intel_fbdev.c
> b/drivers/gpu/drm/i915/intel_fbdev.c
> index fb2f9fce34cd..0e1ddbf1c5a0 100644
> --- a/drivers/gpu/drm/i915/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> @@ -140,7 +140,8 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
> * features. */
> obj = NULL;
> if (size * 2 < dev_priv->stolen_usable_size)
> - obj = i915_gem_object_create_stolen(dev_priv, size);
> + obj = i915_gem_object_create_stolen(dev_priv,
> + size, DRM_MM_INSERT_LOW);
> if (obj == NULL)
> obj = i915_gem_object_create(dev_priv, size);
> if (IS_ERR(obj)) {
> diff --git a/drivers/gpu/drm/i915/intel_overlay.c
> b/drivers/gpu/drm/i915/intel_overlay.c
> index 72eb7e48e8bc..b134b9cabf93 100644
> --- a/drivers/gpu/drm/i915/intel_overlay.c
> +++ b/drivers/gpu/drm/i915/intel_overlay.c
> @@ -1306,7 +1306,8 @@ static int get_registers(struct intel_overlay *overlay,
> bool use_phys)
> struct i915_vma *vma;
> int err;
>
> - obj = i915_gem_object_create_stolen(overlay->i915, PAGE_SIZE);
> + obj = i915_gem_object_create_stolen(overlay->i915,
> + PAGE_SIZE, DRM_MM_INSERT_LOW);
> if (obj == NULL)
> obj = i915_gem_object_create_internal(overlay->i915, PAGE_SIZE);
> if (IS_ERR(obj))
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d99e5fabe93c..5d18301ba079 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -7382,7 +7382,8 @@ static void valleyview_setup_pctx(struct
> drm_i915_private *dev_priv)
> * overlap with other ranges, such as the frame buffer, protected
> * memory, or any other relevant ranges.
> */
> - pctx = i915_gem_object_create_stolen(dev_priv, pctx_size);
> + pctx = i915_gem_object_create_stolen(dev_priv,
> + pctx_size, DRM_MM_INSERT_LOW);
I guess there was no special requirement for the placement of this.
AFAIK the BIOS always allocates it just below the wopcm, but I suppose
it doesn't matter if we take a different approach.
> if (!pctx) {
> DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
> goto out;
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
> b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 472939f5c18f..e6a23a241cf3 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -1104,7 +1104,7 @@ intel_ring_create_vma(struct drm_i915_private
> *dev_priv, int size)
> struct drm_i915_gem_object *obj;
> struct i915_vma *vma;
>
> - obj = i915_gem_object_create_stolen(dev_priv, size);
> + obj = i915_gem_object_create_stolen(dev_priv, size, DRM_MM_INSERT_BEST);
Should these go low? We never reallocate them, right?
> if (!obj)
> obj = i915_gem_object_create_internal(dev_priv, size);
> if (IS_ERR(obj))
> --
> 2.19.0.rc2
--
Ville Syrjälä
Intel
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