Hi Joonas/Chris, do you have any comments?
I've asked OCL team for this patch, they also agree to use available aperture size
for max allocation buffer definition, code confirmation ongoing.
> -----Original Message-----
> From: Li, Weinan Z
> Sent: Wednesday, May 3, 2017 8:51 AM
> To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx
> Cc: Li, Weinan Z <weinan.z.li@xxxxxxxxx>
> Subject: [PATCH v3] drm/i915/gvt: return the actual aperture size under gvt
> environment
>
> I915_GEM_GET_APERTURE ioctl is used to probe aperture size from userspace.
> In gvt environment, each vm only use the ballooned part of aperture, so we
> should return the actual available aperture size exclude the reserved part by
> balloon.
>
> v2: add 'reserved' in struct i915_address_space to record the reserved size in
> ggtt by balloon.
>
> v3: remain aper_size as total, adjust aper_available_size exclude reserved and
> pinned. UMD driver need to adjust the max allocation size according to the
> available aperture size but not total size.
>
> Signed-off-by: Weinan Li <weinan.z.li@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 7 +++----
> drivers/gpu/drm/i915/i915_gem_gtt.h | 3 ++-
> drivers/gpu/drm/i915/i915_vgpu.c | 5 ++++-
> 3 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c
> b/drivers/gpu/drm/i915/i915_gem.c index 84ea249..e84576c 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -145,9 +145,8 @@ int i915_mutex_lock_interruptible(struct drm_device
> *dev)
> struct i915_ggtt *ggtt = &dev_priv->ggtt;
> struct drm_i915_gem_get_aperture *args = data;
> struct i915_vma *vma;
> - size_t pinned;
> + size_t pinned = 0;
>
> - pinned = 0;
> mutex_lock(&dev->struct_mutex);
> list_for_each_entry(vma, &ggtt->base.active_list, vm_link)
> if (i915_vma_is_pinned(vma))
> @@ -158,8 +157,8 @@ int i915_mutex_lock_interruptible(struct drm_device
> *dev)
> mutex_unlock(&dev->struct_mutex);
>
> args->aper_size = ggtt->base.total;
> - args->aper_available_size = args->aper_size - pinned;
> -
> + args->aper_available_size = args->aper_size
> + - ggtt->base.reserved - pinned;
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h
> b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index fb15684..bdf832d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -255,7 +255,8 @@ struct i915_address_space {
> struct drm_i915_file_private *file;
> struct list_head global_link;
> u64 total; /* size addr space maps (ex. 2GB for ggtt) */
> -
> + /* size addr space reserved by GVT balloon, only used for ggtt */
> + u64 reserved;
> bool closed;
>
> struct i915_page_dma scratch_page;
> diff --git a/drivers/gpu/drm/i915/i915_vgpu.c
> b/drivers/gpu/drm/i915/i915_vgpu.c
> index 4ab8a97..58055a9 100644
> --- a/drivers/gpu/drm/i915/i915_vgpu.c
> +++ b/drivers/gpu/drm/i915/i915_vgpu.c
> @@ -183,7 +183,7 @@ int intel_vgt_balloon(struct drm_i915_private
> *dev_priv)
>
> unsigned long mappable_base, mappable_size, mappable_end;
> unsigned long unmappable_base, unmappable_size, unmappable_end;
> - int ret;
> + int ret, i;
>
> if (!intel_vgpu_active(dev_priv))
> return 0;
> @@ -242,6 +242,9 @@ int intel_vgt_balloon(struct drm_i915_private
> *dev_priv)
> goto err;
> }
>
> + for (i = 0; i < ARRAY_SIZE(bl_info.space); i++)
> + ggtt->base.reserved += bl_info.space[i].size;
> +
> DRM_INFO("VGT balloon successfully\n");
> return 0;
>
> --
> 1.9.1
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