Hi Am 03.10.21 um 00:13 schrieb Patrik Jakobsson:
On Tue, Sep 28, 2021 at 10:44 AM Thomas Zimmermann <tzimmermann@xxxxxxx> wrote:Allocation and pinning helpers for struct gtt_range are GEM functions, so move them to gem.c. No functional changes. Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> --- drivers/gpu/drm/gma500/framebuffer.c | 1 - drivers/gpu/drm/gma500/gem.c | 133 +++++++++++++-- drivers/gpu/drm/gma500/gem.h | 8 + drivers/gpu/drm/gma500/gma_display.c | 1 + drivers/gpu/drm/gma500/gtt.c | 190 +-------------------- drivers/gpu/drm/gma500/gtt.h | 11 +- drivers/gpu/drm/gma500/psb_intel_display.c | 1 + 7 files changed, 136 insertions(+), 209 deletions(-) diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c index 321e416489a9..ce92d11bd20f 100644 --- a/drivers/gpu/drm/gma500/framebuffer.c +++ b/drivers/gpu/drm/gma500/framebuffer.c @@ -25,7 +25,6 @@ #include "framebuffer.h" #include "gem.h" -#include "gtt.h" #include "psb_drv.h" #include "psb_intel_drv.h" #include "psb_intel_reg.h" diff --git a/drivers/gpu/drm/gma500/gem.c b/drivers/gpu/drm/gma500/gem.c index 5ae54c9d2819..734bcb7a80c8 100644 --- a/drivers/gpu/drm/gma500/gem.c +++ b/drivers/gpu/drm/gma500/gem.c @@ -19,6 +19,89 @@ #include "gem.h" #include "psb_drv.h" +static int psb_gtt_attach_pages(struct gtt_range *gt) +{ + struct page **pages; + + WARN_ON(gt->pages); + + pages = drm_gem_get_pages(>->gem); + if (IS_ERR(pages)) + return PTR_ERR(pages); + + gt->npage = gt->gem.size / PAGE_SIZE; + gt->pages = pages; + + return 0; +} + +static void psb_gtt_detach_pages(struct gtt_range *gt) +{ + drm_gem_put_pages(>->gem, gt->pages, true, false); + gt->pages = NULL; +} + +int psb_gtt_pin(struct gtt_range *gt) +{ + int ret = 0; + struct drm_device *dev = gt->gem.dev; + struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + u32 gpu_base = dev_priv->gtt.gatt_start; + + mutex_lock(&dev_priv->gtt_mutex); + + if (gt->in_gart == 0 && gt->stolen == 0) { + ret = psb_gtt_attach_pages(gt); + if (ret < 0) + goto out; + ret = psb_gtt_insert(dev, gt, 0); + if (ret < 0) { + psb_gtt_detach_pages(gt); + goto out; + } + psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu), + gt->pages, (gpu_base + gt->offset), + gt->npage, 0, 0, PSB_MMU_CACHED_MEMORY); + } + gt->in_gart++; +out: + mutex_unlock(&dev_priv->gtt_mutex); + return ret; +} + +void psb_gtt_unpin(struct gtt_range *gt) +{ + struct drm_device *dev = gt->gem.dev; + struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + u32 gpu_base = dev_priv->gtt.gatt_start; + + mutex_lock(&dev_priv->gtt_mutex); + + WARN_ON(!gt->in_gart); + + gt->in_gart--; + if (gt->in_gart == 0 && gt->stolen == 0) { + psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu), + (gpu_base + gt->offset), gt->npage, 0, 0); + psb_gtt_remove(dev, gt); + psb_gtt_detach_pages(gt); + } + + mutex_unlock(&dev_priv->gtt_mutex); +} + +void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt) +{ + /* Undo the mmap pin if we are destroying the object */ + if (gt->mmapping) { + psb_gtt_unpin(gt); + gt->mmapping = 0; + } + WARN_ON(gt->in_gart && !gt->stolen); + release_resource(>->resource); + kfree(gt); +} + static vm_fault_t psb_gem_fault(struct vm_fault *vmf); static void psb_gem_free_object(struct drm_gem_object *obj) @@ -44,19 +127,43 @@ const struct drm_gem_object_funcs psb_gem_object_funcs = { .vm_ops = &psb_gem_vm_ops, }; -/** - * psb_gem_create - create a mappable object - * @file: the DRM file of the client - * @dev: our device - * @size: the size requested - * @handlep: returned handle (opaque number) - * @stolen: unused - * @align: unused - * - * Create a GEM object, fill in the boilerplate and attach a handle to - * it so that userspace can speak about it. This does the core work - * for the various methods that do/will create GEM objects for things - */ +struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len, + const char *name, int backed, u32 align) +{ + struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + struct gtt_range *gt; + struct resource *r = dev_priv->gtt_mem; + int ret; + unsigned long start, end; + + if (backed) { + /* The start of the GTT is the stolen pages */ + start = r->start; + end = r->start + dev_priv->gtt.stolen_size - 1; + } else { + /* The rest we will use for GEM backed objects */ + start = r->start + dev_priv->gtt.stolen_size; + end = r->end; + } + + gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL); + if (gt == NULL) + return NULL; + gt->resource.name = name; + gt->stolen = backed; + gt->in_gart = backed; + /* Ensure this is set for non GEM objects */ + gt->gem.dev = dev; + ret = allocate_resource(dev_priv->gtt_mem, >->resource, + len, start, end, align, NULL, NULL);Not something for this patch but I think we're missing locking around resource alloc and release.
There's a lock being taken within the function. [1]
+ if (ret == 0) { + gt->offset = gt->resource.start - r->start; + return gt; + } + kfree(gt); + return NULL; +} + int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size, u32 *handlep, int stolen, u32 align) { diff --git a/drivers/gpu/drm/gma500/gem.h b/drivers/gpu/drm/gma500/gem.h index bae6454ead29..275494aedd4c 100644 --- a/drivers/gpu/drm/gma500/gem.h +++ b/drivers/gpu/drm/gma500/gem.h @@ -8,6 +8,8 @@ #ifndef _GEM_H #define _GEM_H +#include <drm/drm_gem.h> + struct drm_device; extern const struct drm_gem_object_funcs psb_gem_object_funcs; @@ -15,4 +17,10 @@ extern const struct drm_gem_object_funcs psb_gem_object_funcs; extern int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size, u32 *handlep, int stolen, u32 align); +struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len, const char *name, + int backed, u32 align); +void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt); +int psb_gtt_pin(struct gtt_range *gt); +void psb_gtt_unpin(struct gtt_range *gt); + #endif diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c index cbcecbaa041b..ecf8153416ac 100644 --- a/drivers/gpu/drm/gma500/gma_display.c +++ b/drivers/gpu/drm/gma500/gma_display.c @@ -15,6 +15,7 @@ #include <drm/drm_vblank.h> #include "framebuffer.h" +#include "gem.h" #include "gma_display.h" #include "psb_drv.h" #include "psb_intel_drv.h" diff --git a/drivers/gpu/drm/gma500/gtt.c b/drivers/gpu/drm/gma500/gtt.c index 55a2a6919533..0aacf7122e32 100644 --- a/drivers/gpu/drm/gma500/gtt.c +++ b/drivers/gpu/drm/gma500/gtt.c @@ -71,8 +71,7 @@ static u32 __iomem *psb_gtt_entry(struct drm_device *dev, struct gtt_range *r) * the GTT. This is protected via the gtt mutex which the caller * must hold. */ -static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r, - int resume) +int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r, int resume) { u32 __iomem *gtt_slot; u32 pte; @@ -116,7 +115,7 @@ static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r, * page table entries with the dummy page. This is protected via the gtt * mutex which the caller must hold. */ -static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r) +void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); u32 __iomem *gtt_slot; @@ -135,191 +134,6 @@ static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r) set_pages_array_wb(r->pages, r->npage); } -/** - * psb_gtt_attach_pages - attach and pin GEM pages - * @gt: the gtt range - * - * Pin and build an in kernel list of the pages that back our GEM object. - * While we hold this the pages cannot be swapped out. This is protected - * via the gtt mutex which the caller must hold. - */The documentation about locking is still relevant. I'm not a big fan of documenting the obvious but locking is an exception.
Make sense. I'll reduce the kerneldoc comment to the notes on locking. Best regards Thomas [1] https://elixir.bootlin.com/linux/latest/source/kernel/resource.c#L745
-static int psb_gtt_attach_pages(struct gtt_range *gt) -{ - struct page **pages; - - WARN_ON(gt->pages); - - pages = drm_gem_get_pages(>->gem); - if (IS_ERR(pages)) - return PTR_ERR(pages); - - gt->npage = gt->gem.size / PAGE_SIZE; - gt->pages = pages; - - return 0; -} - -/** - * psb_gtt_detach_pages - attach and pin GEM pages - * @gt: the gtt range - * - * Undo the effect of psb_gtt_attach_pages. At this point the pages - * must have been removed from the GTT as they could now be paged out - * and move bus address. This is protected via the gtt mutex which the - * caller must hold. - */Same thing about locking here-static void psb_gtt_detach_pages(struct gtt_range *gt) -{ - drm_gem_put_pages(>->gem, gt->pages, true, false); - gt->pages = NULL; -} - -/** - * psb_gtt_pin - pin pages into the GTT - * @gt: range to pin - * - * Pin a set of pages into the GTT. The pins are refcounted so that - * multiple pins need multiple unpins to undo. - * - * Non GEM backed objects treat this as a no-op as they are always GTT - * backed objects. - */ -int psb_gtt_pin(struct gtt_range *gt) -{ - int ret = 0; - struct drm_device *dev = gt->gem.dev; - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - u32 gpu_base = dev_priv->gtt.gatt_start; - - mutex_lock(&dev_priv->gtt_mutex); - - if (gt->in_gart == 0 && gt->stolen == 0) { - ret = psb_gtt_attach_pages(gt); - if (ret < 0) - goto out; - ret = psb_gtt_insert(dev, gt, 0); - if (ret < 0) { - psb_gtt_detach_pages(gt); - goto out; - } - psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu), - gt->pages, (gpu_base + gt->offset), - gt->npage, 0, 0, PSB_MMU_CACHED_MEMORY); - } - gt->in_gart++; -out: - mutex_unlock(&dev_priv->gtt_mutex); - return ret; -} - -/** - * psb_gtt_unpin - Drop a GTT pin requirement - * @gt: range to pin - * - * Undoes the effect of psb_gtt_pin. On the last drop the GEM object - * will be removed from the GTT which will also drop the page references - * and allow the VM to clean up or page stuff. - * - * Non GEM backed objects treat this as a no-op as they are always GTT - * backed objects. - */ -void psb_gtt_unpin(struct gtt_range *gt) -{ - struct drm_device *dev = gt->gem.dev; - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - u32 gpu_base = dev_priv->gtt.gatt_start; - - mutex_lock(&dev_priv->gtt_mutex); - - WARN_ON(!gt->in_gart); - - gt->in_gart--; - if (gt->in_gart == 0 && gt->stolen == 0) { - psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu), - (gpu_base + gt->offset), gt->npage, 0, 0); - psb_gtt_remove(dev, gt); - psb_gtt_detach_pages(gt); - } - - mutex_unlock(&dev_priv->gtt_mutex); -} - -/* - * GTT resource allocator - allocate and manage GTT address space - */ - -/** - * psb_gtt_alloc_range - allocate GTT address space - * @dev: Our DRM device - * @len: length (bytes) of address space required - * @name: resource name - * @backed: resource should be backed by stolen pages - * @align: requested alignment - * - * Ask the kernel core to find us a suitable range of addresses - * to use for a GTT mapping. - * - * Returns a gtt_range structure describing the object, or NULL on - * error. On successful return the resource is both allocated and marked - * as in use. - */ -struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len, - const char *name, int backed, u32 align) -{ - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - struct gtt_range *gt; - struct resource *r = dev_priv->gtt_mem; - int ret; - unsigned long start, end; - - if (backed) { - /* The start of the GTT is the stolen pages */ - start = r->start; - end = r->start + dev_priv->gtt.stolen_size - 1; - } else { - /* The rest we will use for GEM backed objects */ - start = r->start + dev_priv->gtt.stolen_size; - end = r->end; - } - - gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL); - if (gt == NULL) - return NULL; - gt->resource.name = name; - gt->stolen = backed; - gt->in_gart = backed; - /* Ensure this is set for non GEM objects */ - gt->gem.dev = dev; - ret = allocate_resource(dev_priv->gtt_mem, >->resource, - len, start, end, align, NULL, NULL); - if (ret == 0) { - gt->offset = gt->resource.start - r->start; - return gt; - } - kfree(gt); - return NULL; -} - -/** - * psb_gtt_free_range - release GTT address space - * @dev: our DRM device - * @gt: a mapping created with psb_gtt_alloc_range - * - * Release a resource that was allocated with psb_gtt_alloc_range. If the - * object has been pinned by mmap users we clean this up here currently. - */ -void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt) -{ - /* Undo the mmap pin if we are destroying the object */ - if (gt->mmapping) { - psb_gtt_unpin(gt); - gt->mmapping = 0; - } - WARN_ON(gt->in_gart && !gt->stolen); - release_resource(>->resource); - kfree(gt); -} - static void psb_gtt_alloc(struct drm_device *dev) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); diff --git a/drivers/gpu/drm/gma500/gtt.h b/drivers/gpu/drm/gma500/gtt.h index 2bf165849ebe..36162b545570 100644 --- a/drivers/gpu/drm/gma500/gtt.h +++ b/drivers/gpu/drm/gma500/gtt.h @@ -41,12 +41,9 @@ struct gtt_range { #define to_gtt_range(x) container_of(x, struct gtt_range, gem) -extern struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len, - const char *name, int backed, - u32 align); -extern void psb_gtt_kref_put(struct gtt_range *gt); -extern void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt); -extern int psb_gtt_pin(struct gtt_range *gt); -extern void psb_gtt_unpin(struct gtt_range *gt); extern int psb_gtt_restore(struct drm_device *dev); + +int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r, int resume); +void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r); + #endif diff --git a/drivers/gpu/drm/gma500/psb_intel_display.c b/drivers/gpu/drm/gma500/psb_intel_display.c index f5f259fde88e..18d5f7e5889e 100644 --- a/drivers/gpu/drm/gma500/psb_intel_display.c +++ b/drivers/gpu/drm/gma500/psb_intel_display.c @@ -12,6 +12,7 @@ #include <drm/drm_plane_helper.h> #include "framebuffer.h" +#include "gem.h" #include "gma_display.h" #include "power.h" #include "psb_drv.h" -- 2.33.0
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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