[LUCID BUG# 507148] [PATCH 1/2] drm/radeon/bo: add some fallback placements for VRAM only objects.

[Stefan Bader]

Manoj Iyer wrote:
> Tested the following upstream patchs on Thinkpad T42, this patch seems fix 
> issues with drm/compiz on ATI Radeon Mobility 7500. Please review and pull 
> for lucid.
> 
> 
> The following changes since commit 
> 762ba435f6c1050068f3372bc61a1477b0066e33:
>    Dave Airlie (1):
>          drm/radeon/bo: add some fallback placements for VRAM only objects.
> 
> are available in the git repository at:
> 
>    git://kernel.ubuntu.com/manjo/ubuntu-lucid.git lp507148upstream
> 
> Dave Airlie (1):
>        drm/radeon/kms: don't print error on -ERESTARTSYS.
> 
>   drivers/gpu/drm/radeon/radeon_cs.c |    3 ++-
>   1 files changed, 2 insertions(+), 1 deletions(-)
> 
> From 762ba435f6c1050068f3372bc61a1477b0066e33 Mon Sep 17 00:00:00 2001
> From: Dave Airlie <airlied at redhat.com>
> Date: Fri, 19 Mar 2010 10:32:10 +1000
> Subject: [PATCH 1/2] drm/radeon/bo: add some fallback placements for VRAM only objects.
> 
> On constrained r100 systems compiz would fail to start due to a lack
> of memory, we can just fallback place the objects rather than completely
> failing it works a lot better.
> 
> Cc: stable at kernel.org
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> (cherry picked from commit 924788672f9c802a4c8e6bc8d88fbc2c9b2e3089)

You really should document _where_ you got that from. As far as I could see this
is not in Linus tree.

> 
> Signed-off-by: Manoj Iyer <manoj.iyer at canonical.com>
> 
> BUGLINK: http://launchpad.net/bugs/507148
> ---
>   drivers/gpu/drm/radeon/radeon.h        |    2 ++
>   drivers/gpu/drm/radeon/radeon_object.c |   10 +++++++---
>   2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index c0356bb..e1553f0 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -214,7 +214,9 @@ struct radeon_bo {
>   	struct list_head		list;
>   	/* Protected by tbo.reserved */
>   	u32				placements[3];
> +	u32				busy_placements[3];
>   	struct ttm_placement		placement;
> +	struct ttm_placement		busy_placement;
>   	struct ttm_buffer_object	tbo;
>   	struct ttm_bo_kmap_obj		kmap;
>   	unsigned			pin_count;
> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
> index f1da370..e781fa9 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.c
> +++ b/drivers/gpu/drm/radeon/radeon_object.c
> @@ -65,15 +65,19 @@ bool radeon_ttm_bo_is_radeon_bo(struct ttm_buffer_object *bo)
> 
>   void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
>   {
> -	u32 c = 0;
> +	u32 c = 0, b = 0;
> 
>   	rbo->placement.fpfn = 0;
>   	rbo->placement.lpfn = 0;
>   	rbo->placement.placement = rbo->placements;
> -	rbo->placement.busy_placement = rbo->placements;
> +	rbo->placement.busy_placement = rbo->busy_placements;
>   	if (domain & RADEON_GEM_DOMAIN_VRAM)
>   		rbo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
>   					TTM_PL_FLAG_VRAM;
> +	/* add busy placement to TTM if VRAM is only option */
> +	if (domain == RADEON_GEM_DOMAIN_VRAM) {
> +		rbo->busy_placements[b++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
> +	}
>   	if (domain & RADEON_GEM_DOMAIN_GTT)
>   		rbo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
>   	if (domain & RADEON_GEM_DOMAIN_CPU)
> @@ -81,7 +85,7 @@ void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
>   	if (!c)
>   		rbo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
>   	rbo->placement.num_placement = c;
> -	rbo->placement.num_busy_placement = c;
> +	rbo->placement.num_busy_placement = b;
>   }
> 
>   int radeon_bo_create(struct radeon_device *rdev, struct drm_gem_object *gobj,