From: Paulo Zanoni Date: Thu, 2 Jul 2015 22:25:09 +0000 (-0300) Subject: drm/i915: add dev_priv->mm.stolen_lock X-Git-Tag: firefly_0821_release~176^2~721^2~33^2~301 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=92e97d2f47616b144feb86db489e134935b021b8;p=firefly-linux-kernel-4.4.55.git drm/i915: add dev_priv->mm.stolen_lock Which should protect dev_priv->mm.stolen usage. This will allow us to simplify the relationship between stolen memory, FBC and struct_mutex. v2: - Rebase after the stolen_remove_node() dev_priv patch move. - I realized that after we fixed a few things related to the FBC CFB size checks, we're not reallocating the CFB anymore with FBC enabled, so we can just move all the locking to i915_gem_stolen.c and stop worrying about freezing all the stolen alocations while freeing/rellocating the CFB. This allows us to fix the "Too coarse" observation from Chris. Suggested-by: Chris Wilson Signed-off-by: Paulo Zanoni Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 2b78686e23d9..eb10c1624006 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1245,6 +1245,10 @@ struct intel_l3_parity { struct i915_gem_mm { /** Memory allocator for GTT stolen memory */ struct drm_mm stolen; + /** Protects the usage of the GTT stolen memory allocator. This is + * always the inner lock when overlapping with struct_mutex. */ + struct mutex stolen_lock; + /** List of all objects in gtt_space. Used to restore gtt * mappings on resume */ struct list_head bound_list; diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index d2d556c69175..de76d886cd1d 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -46,17 +46,25 @@ int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv, struct drm_mm_node *node, u64 size, unsigned alignment) { + int ret; + if (!drm_mm_initialized(&dev_priv->mm.stolen)) return -ENODEV; - return drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment, - DRM_MM_SEARCH_DEFAULT); + mutex_lock(&dev_priv->mm.stolen_lock); + ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment, + DRM_MM_SEARCH_DEFAULT); + mutex_unlock(&dev_priv->mm.stolen_lock); + + return ret; } void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv, struct drm_mm_node *node) { + mutex_lock(&dev_priv->mm.stolen_lock); drm_mm_remove_node(node); + mutex_unlock(&dev_priv->mm.stolen_lock); } static unsigned long i915_stolen_to_physical(struct drm_device *dev) @@ -184,6 +192,8 @@ int i915_gem_init_stolen(struct drm_device *dev) u32 tmp; int bios_reserved = 0; + mutex_init(&dev_priv->mm.stolen_lock); + #ifdef CONFIG_INTEL_IOMMU if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) { DRM_INFO("DMAR active, disabling use of stolen memory\n"); @@ -384,7 +394,9 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, stolen->start = stolen_offset; stolen->size = size; + mutex_lock(&dev_priv->mm.stolen_lock); ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); + mutex_unlock(&dev_priv->mm.stolen_lock); if (ret) { DRM_DEBUG_KMS("failed to allocate stolen space\n"); kfree(stolen);