linux-stable.git/include/drm/ttm, branch linux-2.6.33.y

drm/ttm: Fix two race conditions + fix busy codepaths

2011-03-21T19:45:30+00:00

commit 1df6a2ebd75067aefbdf07482bf8e3d0584e04ee upstream.

This fixes a race pointed out by Dave Airlie where we don't take a buffer
object about to be destroyed off the LRU lists properly. It also fixes a rare
case where a buffer object could be destroyed in the middle of an
accelerated eviction.

The patch also adds a utility function that can be used to prematurely
release GPU memory space usage of an object waiting to be destroyed.
For example during eviction or swapout.

The above mentioned commit didn't queue the buffer on the delayed destroy
list under some rare circumstances. It also didn't completely honor the
remove_all parameter.

Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=615505
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=591061

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Dave Airlie 
[ Backported to 2.6.33 -maks ]
Cc: maximilian attems 
Signed-off-by: Greg Kroah-Hartman

drm/ttm: Add a swap_notify callback.

2010-01-14T02:18:54+00:00

This is needed for a bugfix in the vmwgfx driver.
Drivers may have GPU bindings on buffers that core TTM is not aware of,
and TTM may view those buffers as ordinary system memory buffers.
Add a notifier to such drivers when TTM is about to move the buffer
contents out to swappable memory. The driver must then release any
private GPU bindings on those buffers.

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Dave Airlie

drm/ttm: Add more driver type enums

2009-12-14T22:38:18+00:00

Signed-off-by: Jakob Bornecrantz 
Signed-off-by: Dave Airlie

drm/ttm: Convert ttm_buffer_object_init to use ttm_placement

2009-12-11T04:09:05+00:00

Convert ttm_buffer_object_init to use struct ttm_placement and
rename to ttm_bo_init for consistency with function naming. This
allow to give more complex placement at buffer creation. For
instance you ask to allocate bo into vram first but if there is
not enough vram you can give system as a second possible
placement. It also allow to create buffer in a specific range.

Also rename ttm_buffer_object_validate to ttm_bo_validate.

Signed-off-by: Jerome Glisse 
Signed-off-by: Dave Airlie

drm/ttm: Have the TTM code return -ERESTARTSYS instead of -ERESTART.

2009-12-10T05:09:03+00:00

Return -ERESTARTSYS instead of -ERESTART when interrupted by a signal.
The -ERESTARTSYS is converted to an -EINTR by the kernel signal layer
before returned to user-space.

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Jerome Glisse 
Signed-off-by: Dave Airlie

drm/ttm: Rework validation & memory space allocation (V3)

2009-12-10T05:09:02+00:00

This change allow driver to pass sorted memory placement,
from most prefered placement to least prefered placement.
In order to avoid long function prototype a structure is
used to gather memory placement informations such as range
restriction (if you need a buffer to be in given range).
Range restriction is determined by fpfn & lpfn which are
the first page and last page number btw which allocation
can happen. If those fields are set to 0 ttm will assume
buffer can be put anywhere in the address space (thus it
avoids putting a burden on the driver to always properly
set those fields).

This patch also factor few functions like evicting first
entry of lru list or getting a memory space. This avoid
code duplication.

V2: Change API to use placement flags and array instead
    of packing placement order into a quadword.
V3: Make sure we set the appropriate mem.placement flag
    when validating or allocation memory space.

[Pending Thomas Hellstrom further review but okay
from preliminary review so far].

Signed-off-by: Jerome Glisse 
Signed-off-by: Dave Airlie

drm/ttm: Export symbols needed for the vmwgfx driver.

2009-12-07T05:22:07+00:00

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Dave Airlie

drm/ttm: Add TTM execbuf utilities.

2009-12-07T05:22:05+00:00

Utilities to reserve, unreserve and fence a list of TTM
buffer objects in a deadlock-safe manner.

Used by the vmwgfx driver.

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Dave Airlie

drm/ttm: Add ttm lock functionality.

2009-12-07T05:22:03+00:00

This is intended to be used by ttm-aware drivers to
1) Block clients to inactive masters when
they try to validate buffers for GPU use.
2) Optionally block clients to the current master when
there is thrashing due to GPU memory shortage.

Used by the vmwgfx driver.

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Dave Airlie

drm/ttm: Add user-space objects.

2009-12-07T05:22:01+00:00

Add objects needed for user-space to maintain reference counts on ttm objects.
This is used by the vmwgfx driver which allows user-space to maintain
map-counts on dma buffers, lock-counts on the ttm lock and ref-counts on
gpu surfaces, gpu contexts and dma buffer.

Signed-off-by: Thomas Hellstrom 
Signed-off-by: Dave Airlie