Commit Graph

40 Commits

Author SHA1 Message Date
Thomas Hellstrom 7dfbbdcffe drm/ttm: Be consistent on ttm_bo_init() failures
Call destroy() on _all_ ttm_bo_init() failures, and make sure that
behavior is documented in the function description.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-11-10 11:52:19 +10:00
Thomas Hellstrom 3205bc242b drm/ttm: Documentation update
Remove an obsolete comment about mm nodes.
Document the new bo range manager interface.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-11-09 13:33:15 +10:00
Thomas Hellstrom 40d857bba2 drm/ttm: Avoid using the ttm_mem_type_manager::put_locked function
Release the lru spinlock early.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-21 11:53:24 +10:00
Dave Airlie c9220b0f7c drm/ttm: add unlocked variant of new manager put node.
We need the unlocked variant for the new codepath introduced to fix the
race condition in master recently.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-19 09:49:42 +10:00
Dave Airlie b7ae5056c9 Merge branch 'drm-fixes' of /home/airlied/kernel/linux-2.6 into drm-core-next
Conflicts:
	drivers/gpu/drm/i915/intel_fb.c
	drivers/gpu/drm/radeon/r600_blit_kms.c
	drivers/gpu/drm/ttm/ttm_bo.c
2010-10-19 09:48:34 +10:00
Thomas Hellstrom 1df6a2ebd7 drm/ttm: Fix two race conditions + fix busy codepaths
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 <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-06 09:04:43 +10:00
Ben Skeggs d961db75ce drm/ttm: restructure to allow driver to plug in alternate memory manager
Nouveau will need this on GeForce 8 and up to account for the GPU
reordering physical VRAM for some memory types.

Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Acked-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2010-10-05 10:01:20 +10:00
Ben Skeggs 42311ff90d drm/ttm: introduce utility function to free an allocated memory node
Existing core code/drivers call drm_mm_put_block on ttm_mem_reg.mm_node
directly.  Future patches will modify TTM behaviour in such a way that
ttm_mem_reg.mm_node doesn't necessarily belong to drm_mm.

Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Acked-by: Thomas Hellström <thellstrom@vmware.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2010-10-05 10:00:34 +10:00
Dave Airlie ba4420c224 drm: move ttm global code to core drm
I wrote this for the prime sharing work, but I also noticed other external
non-upstream drivers from a large company carrying a similiar patch, so I
may as well ship it in master.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-08-04 09:46:06 +10:00
Francisco Jerez 5870a4d97d drm/ttm: Allocate the page pool manager in the heap.
Repeated ttm_page_alloc_init/fini fails noisily because the pool
manager kobj isn't zeroed out between uses (we could do just that but
statically allocated kobjects are generally considered a bad thing).
Move it to kzalloc'ed memory.

Note that this patch drops the refcounting behavior of the pool
allocator init/fini functions: it would have led to a race condition
in its current form, and anyway it was never exploited.

This fixes a regression with reloading kms modules at runtime, since
page allocator was introduced.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-07 12:14:11 +10:00
Linus Torvalds 59534f7298 Merge branch 'drm-for-2.6.35' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-for-2.6.35' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (207 commits)
  drm/radeon/kms/pm/r600: select the mid clock mode for single head low profile
  drm/radeon: fix power supply kconfig interaction.
  drm/radeon/kms: record object that have been list reserved
  drm/radeon: AGP memory is only I/O if the aperture can be mapped by the CPU.
  drm/radeon/kms: don't default display priority to high on rs4xx
  drm/edid: fix typo in 1600x1200@75 mode
  drm/nouveau: fix i2c-related init table handlers
  drm/nouveau: support init table i2c device identifier 0x81
  drm/nouveau: ensure we've parsed i2c table entry for INIT_*I2C* handlers
  drm/nouveau: display error message for any failed init table opcode
  drm/nouveau: fix init table handlers to return proper error codes
  drm/nv50: support fractional feedback divider on newer chips
  drm/nv50: fix monitor detection on certain chipsets
  drm/nv50: store full dcb i2c entry from vbios
  drm/nv50: fix suspend/resume with DP outputs
  drm/nv50: output calculated crtc pll when debugging on
  drm/nouveau: dump pll limits entries when debugging is on
  drm/nouveau: bios parser fixes for eDP boards
  drm/nouveau: fix a nouveau_bo dereference after it's been destroyed
  drm/nv40: remove some completed ctxprog TODOs
  ...
2010-05-21 11:14:52 -07:00
Matthew Garrett 7c5ee5366f ttm: Provide an API for starting and stopping the delayed workqueue
We want to be able to prevent the delayed workqueue from changing state
while we're reclocking, so add an API to block and unblock it.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-05-18 18:21:20 +10:00
Thomas Hellstrom 8cfe92d683 drm/ttm: Remove the ttm_bo_block_reservation() function.
It's unused and buggy in its current form, since it can place a bo
in the reserved state without removing it from lru lists.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-05-07 09:21:28 +10:00
Dave Airlie 7547a917fa Merge branch 'drm-ttm-unmappable' into drm-core-next
* drm-ttm-unmappable:
  drm/radeon/kms: enable use of unmappable VRAM V2
  drm/ttm: remove io_ field from TTM V6
  drm/vmwgfx: add support for new TTM fault callback V5
  drm/nouveau/kms: add support for new TTM fault callback V5
  drm/radeon/kms: add support for new fault callback V7
  drm/ttm: ttm_fault callback to allow driver to handle bo placement V6
  drm/ttm: split no_wait argument in 2 GPU or reserve wait

Conflicts:
	drivers/gpu/drm/nouveau/nouveau_bo.c
2010-04-20 14:15:09 +10:00
Jerome Glisse 0c321c7962 drm/ttm: remove io_ field from TTM V6
All TTM driver have been converted to new io_mem_reserve/free
interface which allow driver to choose and return proper io
base, offset to core TTM for ioremapping if necessary. This
patch remove what is now deadcode.

V2 adapt to match with change in first patch of the patchset
V3 update after io_mem_reserve/io_mem_free callback balancing
V4 adjust to minor cleanup
V5 remove the needs ioremap flag
V6 keep the ioremapping facility in TTM

[airlied- squashed driver removals in here also]

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-04-20 14:13:09 +10:00
Jerome Glisse 82c5da6bf8 drm/ttm: ttm_fault callback to allow driver to handle bo placement V6
On fault the driver is given the opportunity to perform any operation
it sees fit in order to place the buffer into a CPU visible area of
memory. This patch doesn't break TTM users, nouveau, vmwgfx and radeon
should keep working properly. Future patch will take advantage of this
infrastructure and remove the old path from TTM once driver are
converted.

V2 return VM_FAULT_NOPAGE if callback return -EBUSY or -ERESTARTSYS
V3 balance io_mem_reserve and io_mem_free call, fault_reserve_notify
   is responsible to perform any necessary task for mapping to succeed
V4 minor cleanup, atomic_t -> bool as member is protected by reserve
   mecanism from concurent access
V5 the callback is now responsible for iomapping the bo and providing
   a virtual address this simplify TTM and will allow to get rid of
   TTM_MEMTYPE_FLAG_NEEDS_IOREMAP
V6 use the bus addr data to decide to ioremap or this isn't needed
   but we don't necesarily need to ioremap in the callback but still
   allow driver to use static mapping

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-04-20 14:12:05 +10:00
Jerome Glisse 9d87fa2138 drm/ttm: split no_wait argument in 2 GPU or reserve wait
There is case where we want to be able to wait only for the
GPU while not waiting for other buffer to be unreserved. This
patch split the no_wait argument all the way down in the whole
ttm path so that upper level can decide on what to wait on or
not.

[airlied: squashed these 4 for bisectability reasons.]
drm/radeon/kms: update to TTM no_wait splitted argument
drm/nouveau: update to TTM no_wait splitted argument
drm/vmwgfx: update to TTM no_wait splitted argument
[vmwgfx patch: Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>]

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Acked-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-04-08 10:21:19 +10:00
Pauli Nieminen c96af79e34 drm/ttm: Add sysfs interface to control pool allocator.
Sysfs interface allows user to configure pool allocator functionality and
change limits for the size of pool.

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-04-06 11:36:18 +10:00
Pauli Nieminen 0745866165 drm/ttm: Add debugfs output entry to pool allocator.
ttm_page_alloc_debugfs can be registered to output the state
of pools.

Debugfs file will output number of pages freed from the pool,
number of pages in pool now and the lowes number of pages in
pool since previous shrink.

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-04-06 11:35:45 +10:00
Pauli Nieminen 1403b1a38e drm/ttm: add pool wc/uc page allocator V3
On AGP system we might allocate/free routinely uncached or wc memory,
changing page from cached (wb) to uc or wc is very expensive and involves
a lot of flushing. To improve performance this allocator use a pool
of uc,wc pages.

Pools are protected with spinlocks to allow multiple threads to allocate pages
simultanously. Expensive operations are done outside of spinlock to maximize
concurrency.

Pools are linked lists of pages that were recently freed. mm shrink callback
allows kernel to claim back pages when they are required for something else.

Fixes:
* set_pages_array_wb handles highmem pages so we don't have to remove them
  from pool.
* Add count parameter to ttm_put_pages to avoid looping in free code.
* Change looping from _safe to normal in pool fill error path.
* Initialize sum variable and make the loop prettier in get_num_unused_pages.

* Moved pages_freed reseting inside the loop in ttm_page_pool_free.
* Add warning comment about spinlock context in ttm_page_pool_free.

Based on Jerome Glisse's and Dave Airlie's pool allocator.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-04-06 11:35:26 +10:00
Dave Airlie 72e942dd84 drm/ttm: use drm calloc large and free large
Now that the drm core can do this, lets just use it, split the code out
so TTM doesn't have to drag all of drmP.h in.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-03-15 10:31:43 +10:00
Randy Dunlap a55e8d452e drm/ttm: fix function prototype to match implementation
Fix function prototype to match its actual usage and implementation.

drivers/gpu/drm/ttm/ttm_bo_util.c:341:10: error: symbol 'ttm_io_prot' redeclared with different type (originally declared at include/drm/ttm/ttm_bo_driver.h:911) - incompatible argument 1 (different signedness)

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc:	David Airlie <airlied@linux.ie>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-03-01 16:03:26 +10:00
Thomas Hellstrom 3f09ea4ecd drm/ttm: Add a swap_notify callback.
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 <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-01-14 12:18:54 +10:00
Jakob Bornecrantz be1cb8689c drm/ttm: Add more driver type enums
Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-15 08:38:18 +10:00
Jerome Glisse 09855acb1c drm/ttm: Convert ttm_buffer_object_init to use ttm_placement
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 <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-11 14:09:05 +10:00
Thomas Hellstrom 98ffc4158e drm/ttm: Have the TTM code return -ERESTARTSYS instead of -ERESTART.
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 <thellstrom@vmware.com>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-10 15:09:03 +10:00
Jerome Glisse ca262a9998 drm/ttm: Rework validation & memory space allocation (V3)
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 <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-10 15:09:02 +10:00
Thomas Hellstrom 4bfd75cb08 drm/ttm: Export symbols needed for the vmwgfx driver.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-07 15:22:07 +10:00
Thomas Hellstrom c078aa2fc4 drm/ttm: Add TTM execbuf utilities.
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 <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-07 15:22:05 +10:00
Thomas Hellstrom 4aff1013f5 drm/ttm: Add ttm lock functionality.
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 <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-07 15:22:03 +10:00
Thomas Hellstrom 88071539a3 drm/ttm: Add user-space objects.
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 <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-07 15:22:01 +10:00
Martin Michlmayr c3a73ba13b drm/ttm: Fix build failure due to missing struct page
drm/ttm fails to build on MIPS because "struct page" is not known:
| In file included from drivers/gpu/drm/ttm/ttm_memory.c:28:
| include/drm/ttm/ttm_memory.h:154: warning: 'struct page' declared inside parameter list
| include/drm/ttm/ttm_memory.h:154: warning: its scope is only this definition or declaration, which is probably not what you want
| include/drm/ttm/ttm_memory.h:156: warning: 'struct page' declared inside parameter list
| drivers/gpu/drm/ttm/ttm_memory.c:540: error: conflicting types for 'ttm_mem_global_alloc_page'
| include/drm/ttm/ttm_memory.h:154: error: previous declaration of 'ttm_mem_global_alloc_page' was here
| drivers/gpu/drm/ttm/ttm_memory.c:561: error: conflicting types for 'ttm_mem_global_free_page'
| include/drm/ttm/ttm_memory.h:156: error: previous declaration of 'ttm_mem_global_free_page' was here

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Cc: stable@kernel.org
Acked-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-04 09:11:16 +10:00
Dave Airlie 51c8b4071d Merge Linus master to drm-next
linux-next conflict reported needed resolution.

Conflicts:
	drivers/gpu/drm/drm_crtc.c
	drivers/gpu/drm/drm_edid.c
	drivers/gpu/drm/i915/intel_sdvo.c
	drivers/gpu/drm/radeon/radeon_ttm.c
	drivers/gpu/drm/ttm/ttm_bo.c
2009-08-20 13:38:04 +10:00
Thomas Hellstrom a987fcaa80 ttm: Make parts of a struct ttm_bo_device global.
Common resources, like memory accounting and swap lists should be
global and not per device. Introduce a struct ttm_bo_global to
accomodate this, and register it with sysfs. Add a small sysfs interface
to return the number of active buffer objects.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
2009-08-19 16:10:34 +10:00
Thomas Hellstrom 5fd9cbad3a drm/ttm: Memory accounting rework.
Use inclusive zones to simplify accounting and its sysfs representation.
Use DMA32 accounting where applicable.

Add a sysfs interface to make the heuristically determined limits
readable and configurable.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
2009-08-19 16:09:53 +10:00
Pekka Paalanen a0724fcf82 drm/ttm: optimize bo_kmap_type values
A micro-optimization on the function ttm_kmap_obj_virtual().

By defining the values of enum ttm_bo_kmap_obj::bo_kmap_type to have a
bit indicating iomem, size of the function ttm_kmap_obj_virtual() will be
reduced by 16 bytes on x86_64 (gcc 4.1.2).

ttm_kmap_obj_virtual() may be heavily used, when buffer objects are
accessed via wrappers, that work for both kinds of memory addresses:
iomem cookies and kernel virtual.

Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-08-19 16:07:00 +10:00
Dave Airlie e024e11070 drm/radeon/kms: add initial colortiling support.
This adds new set/get tiling interfaces where the pitch
and macro/micro tiling enables can be set. Along with
a flag to decide if this object should have a surface when mapped.

The only thing we need to allocate with a mapped surface should be
the frontbuffer. Note rotate scanout shouldn't require one, and
back/depth shouldn't either, though mesa needs some fixes.

It fixes the TTM interfaces along Thomas's suggestions, and I've tested
the surface stealing code with two X servers and not seen any lockdep issues.

I've stopped tiling the fbcon frontbuffer, as I don't see there being
any advantage other than testing, I've left the testing commands in there,
just flip the fb_tiled to true in radeon_fb.c

Open: Can we integrate endian swapping in with this?

Future features:
texture tiling - need to relocate texture registers TXOFFSET* with tiling info.

This also merges Michel's cleanup surfaces regs at init time patch
even though it makes sense on its own, this patch really relies on it.

Some PowerMac firmwares set up a tiling surface at the beginning of VRAM
which messes us up otherwise.
that patch is:
Signed-off-by: Michel Dänzer <daenzer@vmware.com>

Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-07-29 15:42:18 +10:00
Dave Airlie ad49f50186 drm/ttm/radeon: add dma32 support.
This add support for using dma32 memory on gpus that really need it.

Currently IGPs are left without DMA32 but we might need to change
that unless we can fix rs690.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-07-15 17:13:18 +10:00
Thomas Hellstrom d1724078d6 ttm: Make messages more readable.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-07-15 17:13:09 +10:00
Thomas Hellstrom ba4e7d973d drm: Add the TTM GPU memory manager subsystem.
TTM is a GPU memory manager subsystem designed for use with GPU
devices with various memory types (On-card VRAM, AGP,
PCI apertures etc.). It's essentially a helper library that assists
the DRM driver in creating and managing persistent buffer objects.

TTM manages placement of data and CPU map setup and teardown on
data movement. It can also optionally manage synchronization of
data on a per-buffer-object level.

TTM takes care to provide an always valid virtual user-space address
to a buffer object which makes user-space sub-allocation of
big buffer objects feasible.

TTM uses a fine-grained per buffer-object locking scheme, taking
care to release all relevant locks when waiting for the GPU.
Although this implies some locking overhead, it's probably a big
win for devices with multiple command submission mechanisms, since
the lock contention will be minimal.

TTM can be used with whatever user-space interface the driver
chooses, including GEM. It's used by the upcoming Radeon KMS DRM driver
and is also the GPU memory management core of various new experimental
DRM drivers.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-06-15 09:37:57 +10:00