[Intel-gfx] [PATCH 27/49] drm/i915: Use a separate slab for requests
Daniel Vetter
daniel at ffwll.ch
Fri Mar 27 07:20:08 PDT 2015
On Fri, Mar 27, 2015 at 11:01:59AM +0000, Chris Wilson wrote:
> requests are even more frequently allocated than objects and equally
> benefit from having a dedicated slab.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
vmas, while we're at it?
-Daniel
> ---
> drivers/gpu/drm/i915/i915_dma.c | 12 ++++++++----
> drivers/gpu/drm/i915/i915_drv.h | 5 ++++-
> drivers/gpu/drm/i915/i915_gem.c | 26 ++++++++++++++++++++++----
> drivers/gpu/drm/i915/intel_lrc.c | 11 +++++------
> drivers/gpu/drm/i915/intel_ringbuffer.c | 9 ++++-----
> 5 files changed, 43 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 8f5428b46a27..180b5d92b279 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1006,8 +1006,10 @@ out_regs:
> put_bridge:
> pci_dev_put(dev_priv->bridge_dev);
> free_priv:
> - if (dev_priv->slab)
> - kmem_cache_destroy(dev_priv->slab);
> + if (dev_priv->requests)
> + kmem_cache_destroy(dev_priv->requests);
> + if (dev_priv->objects)
> + kmem_cache_destroy(dev_priv->objects);
> kfree(dev_priv);
> return ret;
> }
> @@ -1090,8 +1092,10 @@ int i915_driver_unload(struct drm_device *dev)
> if (dev_priv->regs != NULL)
> pci_iounmap(dev->pdev, dev_priv->regs);
>
> - if (dev_priv->slab)
> - kmem_cache_destroy(dev_priv->slab);
> + if (dev_priv->requests)
> + kmem_cache_destroy(dev_priv->requests);
> + if (dev_priv->objects)
> + kmem_cache_destroy(dev_priv->objects);
>
> pci_dev_put(dev_priv->bridge_dev);
> kfree(dev_priv);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index ee51540e169a..b728250d6550 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1556,7 +1556,8 @@ struct i915_virtual_gpu {
>
> struct drm_i915_private {
> struct drm_device *dev;
> - struct kmem_cache *slab;
> + struct kmem_cache *objects;
> + struct kmem_cache *requests;
>
> const struct intel_device_info info;
>
> @@ -2052,6 +2053,7 @@ struct drm_i915_gem_request {
> struct kref ref;
>
> /** On Which ring this request was generated */
> + struct drm_i915_private *i915;
> struct intel_engine_cs *ring;
>
> /** GEM sequence number associated with this request. */
> @@ -2118,6 +2120,7 @@ struct drm_i915_gem_request {
> struct list_head execlist_link;
> };
>
> +struct drm_i915_gem_request *i915_gem_request_alloc(struct drm_i915_private *i915);
> void i915_gem_request_free(struct kref *req_ref);
>
> static inline uint32_t
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 5366162e4983..900cbe17c49a 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -381,13 +381,13 @@ out:
> void *i915_gem_object_alloc(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> - return kmem_cache_zalloc(dev_priv->slab, GFP_KERNEL);
> + return kmem_cache_zalloc(dev_priv->objects, GFP_KERNEL);
> }
>
> void i915_gem_object_free(struct drm_i915_gem_object *obj)
> {
> struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
> - kmem_cache_free(dev_priv->slab, obj);
> + kmem_cache_free(dev_priv->objects, obj);
> }
>
> static int
> @@ -2567,6 +2567,19 @@ static void i915_set_reset_status(struct drm_i915_private *dev_priv,
> }
> }
>
> +struct drm_i915_gem_request *i915_gem_request_alloc(struct drm_i915_private *i915)
> +{
> + struct drm_i915_gem_request *rq;
> +
> + rq = kmem_cache_zalloc(i915->requests, GFP_KERNEL);
> + if (rq == NULL)
> + return ERR_PTR(-ENOMEM);
> +
> + kref_init(&rq->ref);
> + rq->i915 = i915;
> + return rq;
> +}
> +
> void i915_gem_request_free(struct kref *req_ref)
> {
> struct drm_i915_gem_request *req = container_of(req_ref,
> @@ -2577,7 +2590,7 @@ void i915_gem_request_free(struct kref *req_ref)
> i915_gem_context_unreference(ctx);
> }
>
> - kfree(req);
> + kmem_cache_free(req->i915->requests, req);
> }
>
> struct drm_i915_gem_request *
> @@ -5110,11 +5123,16 @@ i915_gem_load(struct drm_device *dev)
> struct drm_i915_private *dev_priv = dev->dev_private;
> int i;
>
> - dev_priv->slab =
> + dev_priv->objects =
> kmem_cache_create("i915_gem_object",
> sizeof(struct drm_i915_gem_object), 0,
> SLAB_HWCACHE_ALIGN,
> NULL);
> + dev_priv->requests =
> + kmem_cache_create("i915_gem_request",
> + sizeof(struct drm_i915_gem_request), 0,
> + SLAB_HWCACHE_ALIGN,
> + NULL);
>
> INIT_LIST_HEAD(&dev_priv->vm_list);
> i915_init_vm(dev_priv, &dev_priv->gtt.base);
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index a013239f5e26..5e51ed5232e8 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -742,24 +742,23 @@ static int logical_ring_alloc_request(struct intel_engine_cs *ring,
> if (ring->outstanding_lazy_request)
> return 0;
>
> - request = kzalloc(sizeof(*request), GFP_KERNEL);
> - if (request == NULL)
> - return -ENOMEM;
> + request = i915_gem_request_alloc(dev_private);
> + if (IS_ERR(request))
> + return PTR_ERR(request);
>
> ret = intel_lr_context_pin(ring, ctx);
> if (ret) {
> - kfree(request);
> + i915_gem_request_free(&request->ref);
> return ret;
> }
>
> - kref_init(&request->ref);
> request->ring = ring;
> request->uniq = dev_private->request_uniq++;
>
> ret = i915_gem_get_seqno(ring->dev, &request->seqno);
> if (ret) {
> intel_lr_context_unpin(ring, ctx);
> - kfree(request);
> + i915_gem_request_free(&request->ref);
> return ret;
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 2e5c39123d24..f7097a80dea3 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -2179,18 +2179,17 @@ intel_ring_alloc_request(struct intel_engine_cs *ring)
> if (ring->outstanding_lazy_request)
> return 0;
>
> - request = kzalloc(sizeof(*request), GFP_KERNEL);
> - if (request == NULL)
> - return -ENOMEM;
> + request = i915_gem_request_alloc(dev_private);
> + if (IS_ERR(request))
> + return PTR_ERR(request);
>
> - kref_init(&request->ref);
> request->ring = ring;
> request->ringbuf = ring->buffer;
> request->uniq = dev_private->request_uniq++;
>
> ret = i915_gem_get_seqno(ring->dev, &request->seqno);
> if (ret) {
> - kfree(request);
> + i915_gem_request_free(&request->ref);
> return ret;
> }
>
> --
> 2.1.4
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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