Re: [PATCH v2 01/10] drm/gma500: Move helpers for struct gtt_range from gtt.c to gem.c

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On Tue, Oct 5, 2021 at 10:11 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.
>
> v2:
>         * keep docs for psb_gtt_{attach,detach}_pages() (Patrik)
>

Bonus point for getting rid of psb_gtt_kref_put();

Acked-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>


> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> ---
>  drivers/gpu/drm/gma500/framebuffer.c       |   1 -
>  drivers/gpu/drm/gma500/gem.c               | 144 ++++++++++++++--
>  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, 147 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..a41990dbcc0e 100644
> --- a/drivers/gpu/drm/gma500/gem.c
> +++ b/drivers/gpu/drm/gma500/gem.c
> @@ -19,6 +19,100 @@
>  #include "gem.h"
>  #include "psb_drv.h"
>
> +/*
> + * 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.
> + */
> +static int psb_gtt_attach_pages(struct gtt_range *gt)
> +{
> +       struct page **pages;
> +
> +       WARN_ON(gt->pages);
> +
> +       pages = drm_gem_get_pages(&gt->gem);
> +       if (IS_ERR(pages))
> +               return PTR_ERR(pages);
> +
> +       gt->npage = gt->gem.size / PAGE_SIZE;
> +       gt->pages = pages;
> +
> +       return 0;
> +}
> +
> +/*
> + * 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.
> + */
> +static void psb_gtt_detach_pages(struct gtt_range *gt)
> +{
> +       drm_gem_put_pages(&gt->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(&gt->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 +138,43 @@ 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, &gt->resource,
> +                               len, start, end, align, NULL, NULL);
> +       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.
> - */
> -static int psb_gtt_attach_pages(struct gtt_range *gt)
> -{
> -       struct page **pages;
> -
> -       WARN_ON(gt->pages);
> -
> -       pages = drm_gem_get_pages(&gt->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.
> - */
> -static void psb_gtt_detach_pages(struct gtt_range *gt)
> -{
> -       drm_gem_put_pages(&gt->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, &gt->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(&gt->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
>



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