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path: root/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c (follow)
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2018-07-03drm/vmwgfx: Replace vmw_dma_buffer with vmw_buffer_objectThomas Hellstrom1-887/+0
Initially vmware buffer objects were only used as DMA buffers, so the name DMA buffer was a natural one. However, currently they are used also as dumb buffers and MOBs backing guest backed objects so renaming them to buffer objects is logical. Particularly since there is a dmabuf subsystem in the kernel where a dma buffer means something completely different. This also renames user-space api structures and IOCTL names correspondingly, but the old names remain defined for now and the ABI hasn't changed. There are a couple of minor style changes to make checkpatch happy. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Sinclair Yeh <syeh@vmware.com> Reviewed-by: Deepak Rawat <drawat@vmware.com>
2018-03-22drm/vmwgfx: Avoid pinning fbdev framebuffersThomas Hellstrom1-0/+1
fbdev framebuffers were previously pinned to be able to keep them mapped across updates. This commit introduces a mechanism that instead revalidates the map on each update, keeping the map cached across updates. The cached map is torn down if the underlying pages change. Typically on buffer object moves and swapouts. This should be nicer to the system when we have resource contention. Testing done: Basic fbdev functionality under Fedora 27. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Sinclair Yeh <syeh@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Deepak Rawat <drawat@vmware.com>
2018-03-22drm/vmwgfx: Use the cpu blit utility for framebuffer to screen target blitsThomas Hellstrom1-0/+23
This blit was previously performed using two large vmaps, one of which was teared down and remapped on each blit. Use the more resource- conserving TTM cpu blit instead. The blit is used in boundary-box computing mode which makes it possible to minimize the bounding box used in host operations. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com>
2018-03-14drm/ttm: add bo as parameter to the ttm_tt_create callbackChristian König1-5/+5
Instead of calculating the size in bytes just to recalculate the number of pages from it pass the BO directly to the function. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Roger He <Hongbo.He@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2018-02-26drm/ttm: drop ttm->dummy_read_pageChristian König1-6/+3
Only used by the AGP backend and there it can be easily accessed using ttm->bdev->glob. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-12-28drm/ttm: use an operation ctx for ttm_tt_populate in ttm_bo_driver (v2)Roger He1-8/+5
forward the operation context to ttm_tt_populate as well, and the ultimate goal is swapout enablement for reserved BOs. v2: squash in fix for vboxvideo Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Roger He <Hongbo.He@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-12-27drm/ttm: use an operation ctx for ttm_mem_global_allocRoger He1-3/+10
forward the operation context to ttm_mem_global_alloc as well, and the ultimate goal is swapout enablement for reserved BOs Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Roger He <Hongbo.He@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-12-27drm/vmwgfx: remove the default io_mem_pfn setTan Xiaojun1-1/+0
The default interface situation has been taken into the framework, so remove the default set of each module. Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-07-17drm/vmwgfx: dma-buf: Constify ttm_place structures.Arvind Yadav1-12/+12
ttm_place are not supposed to change at runtime. All functions working with ttm_place provided by <drm/ttm/ttm_placement.h> work with const ttm_place. So mark the non-const structs as const. File size before: text data bss dec hex filename 3172 796 16 3984 f90 drivers/gpu/drm/vmwgfx/vmwgfx_buffer.o File size After adding 'const': text data bss dec hex filename 3456 512 16 3984 f90 drivers/gpu/drm/vmwgfx/vmwgfx_buffer.o Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Reviewed-by: Sinclair Yeh <syeh@vmware.com>
2017-04-04drm/ttm: add io_mem_pfn callbackChristian König1-0/+1
This allows the driver to handle io_mem mappings on their own. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-02-01Merge branch 'drm-vmwgfx-next' of git://people.freedesktop.org/~syeh/repos_linux into drm-nextDave Airlie1-1/+1
This is to address what we've discussed, moving some of the minor changes into a drm-next request. * 'drm-vmwgfx-next' of git://people.freedesktop.org/~syeh/repos_linux: drm/vmwgfx: Use kmemdup instead of kmalloc and memcpy drm/vmwgfx: Fix depth input into drm_mode_legacy_fb_format drm/vmwgfx: Fix a potential integer overflow drm/vmwgfx: Clear an uninitialized struct member drm/vmwgfx: Annotate ignored return values drm/vmwgfx: Clear uninitialized fields of a parameter
2017-01-27drm/ttm: revert "implement LRU add callbacks v2"Christian König1-2/+0
The additional housekeeping had too much CPU overhead, let's use the BO priorities instead. agd: also revert hibmc changes Reviewed-by: Sinclair Yeh <syeh@vmware.com> Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-and-Tested-by: Roger.He <Hongbo.He@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-01-27drm/ttm: add evict parameter to ttm_bo_driver::move_notifyNicolai Hähnle1-0/+1
Ensure that the driver can listen to evictions even when they don't take the path through ttm_bo_driver::move. This is crucial for amdgpu, which relies on an eviction counter to skip re-binding page tables when possible. Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com> Reviewed-by: Chunming Zhou <david1.zhou@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-01-26drm/vmwgfx: Annotate ignored return valuesThomas Hellstrom1-1/+1
Cast return values to void since they, based on input arguments, are known to be zero. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Sinclair Yeh <syeh@vmware.com> Reviewed-by: Charmaine Lee <charmainel@vmware.com>
2016-10-25drm/ttm: make eviction decision a driver callback v2Christian König1-0/+1
This way the driver can decide if it is valuable to evict a BO or not. The current implementation is added as default to all existing drivers. v2: fix some typos found during internal testing Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2016-05-04drm/ttm: implement LRU add callbacks v2Christian König1-0/+2
This allows fine grained control for the driver where to add a BO into the LRU. v2: fix typo in comment Reviewed-by: Sinclair Yeh <syeh@vmware.com> Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2016-05-04drm/ttm: remove lazy parameter from ttm_bo_waitChristian König1-1/+1
Not used any more. Reviewed-by: Sinclair Yeh <syeh@vmware.com> Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2015-08-12drm/vmwgfx: Fix copyright headersSinclair Yeh1-1/+1
Updating and fixing copyright headers. Bump version minor to signal vgpu10 support. Signed-off-by: Sinclair Yeh <syeh@vmware.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com>
2015-08-12drm/vmwgfx: Add DX query support. Various fixes.Sinclair Yeh1-4/+5
Add support for vgpu10 queries. Functional- and formatting fixes. Signed-off-by: Sinclair Yeh <syeh@vmware.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
2015-08-05drm/vmwgfx: Add command buffer support v3Thomas Hellstrom1-0/+13
Add command buffer support. Currently we don't implement preemption or fancy error handling. Tested with a couple of mesa-demos, compiz/unity and viewperf maya-03. v2: - Synchronize with pending work at command buffer manager takedown. - Add an interface to flush the current command buffer for latency-critical command batches and apply it to framebuffer dirtying. v3: - Minor fixes of definitions and typos to address reviews. - Removed new or moved branch predictor hints. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Sinclair Yeh <syeh@vmware.com>
2014-09-02drm/ttm: flip the switch, and convert to dma_fenceMaarten Lankhorst1-40/+0
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
2014-09-02drm/vmwgfx: get rid of different types of fence_flags entirelyMaarten Lankhorst1-4/+1
Only one type was ever used. This is needed to simplify the fence support in the next commit. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
2014-09-01drm/ttm: kill fence_lockMaarten Lankhorst1-4/+0
No users are left, kill it off! :D Conversion to the reservation api is next on the list, after that the functionality can be restored with rcu. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
2014-08-27drm/ttm: move fpfn and lpfn into each placement v2Christian König1-51/+85
This allows us to more fine grained specify where to place the buffer object. v2: rebased on drm-next, add bochs changes as well Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
2014-01-17drm/vmwgfx: Use the linux DMA api also for MOBsThomas Hellstrom1-1/+60
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
2014-01-17drm/vmwgfx: Hook up MOBs to TTM as a separate memory typeThomas Hellstrom1-7/+95
To bind a buffer object as a MOB, just validate it as a MOB memory type. We are reusing the GMRID manager, although we create a new instance of it to manage MOB ids and tomake sure we don't exceed the maximum amount of MOB pages. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com>
2014-01-17drm/vmwgfx: Add MOB managementThomas Hellstrom1-0/+13
Implement MOB setup, binding and unbinding, but don't hook up to TTM yet. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Zack Rusin <zackr@vmware.com>
2014-01-08drivers: gpu: Mark functions as static in vmwgfx_buffer.cRashika Kheria1-4/+4
Mark functions as static because they are not used outside the file drm/vmwgfx/vmwgfx_buffer.c. This eliminates the following warnings in drm/vmwgfx/vmwgfx_buffer.c: drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c:520:16: warning: no previous prototype for ‘vmw_ttm_tt_create’ [-Wmissing-prototypes] drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c:549:5: warning: no previous prototype for ‘vmw_invalidate_caches’ [-Wmissing-prototypes] drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c:554:5: warning: no previous prototype for ‘vmw_init_mem_type’ [-Wmissing-prototypes] drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c:592:6: warning: no previous prototype for ‘vmw_evict_flags’ [-Wmissing-prototypes] Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
2013-12-04drm/vmwgfx: Fix dma buffer memory size accountingThomas Hellstrom1-0/+2
Also request kernel ttm_buffer objects for buffer objects that obviously aren't visible to user-space, and save some device address space. The accounting was broken in a couple of ways: 1) We did not differentiate between user dma buffers and kernel dma buffers. 2) The ttm_bo_acc_size function is broken in that it a) Doesn't take into account the size of the optional dma address array, b) Doesn't take into account the fact that drivers typically embed the ttm_tt structure. This needs to be fixed in ttm, but meanwhile provide a vmwgfx-specific function to do the job. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
2013-11-06drm/vmwgfx: Use the linux DMA api to get valid device addresses of pagesThomas Hellstrom1-17/+362
The code handles three different cases: 1) physical page addresses. The ttm page array is used. 2) DMA subsystem addresses. A scatter-gather list is used. 3) Coherent pages. The ttm dma pool is used, together with the dma_ttm array os dma_addr_t Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
2012-11-28drm/vmwgfx: Tighten the security around buffer mapsThomas Hellstrom1-5/+4
Make sure that other DRM clients can't map the contents of non-shareable buffer objects. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-11-20drm/ttm: remove sync_arg from driver functionsMaarten Lankhorst1-4/+3
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-11-20drm/vmwgfx: remove use of fence_obj_argsMaarten Lankhorst1-5/+2
It's always hardcoded to the same value. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-10-02UAPI: (Scripted) Convert #include "..." to #include <path/...> in drivers/gpu/David Howells1-3/+3
Convert #include "..." to #include <path/...> in drivers/gpu/. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Dave Airlie <airlied@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2011-12-06drm/ttm: isolate dma data from ttm_tt V4Jerome Glisse1-0/+2
Move dma data to a superset ttm_dma_tt structure which herit from ttm_tt. This allow driver that don't use dma functionalities to not have to waste memory for it. V2 Rebase on top of no memory account changes (where/when is my delorean when i need it ?) V3 Make sure page list is initialized empty V4 typo/syntax fixes Signed-off-by: Jerome Glisse <jglisse@redhat.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
2011-12-06drm/ttm: introduce callback for ttm_tt populate & unpopulate V4Jerome Glisse1-0/+3
Move the page allocation and freeing to driver callback and provide ttm code helper function for those. Most intrusive change, is the fact that we now only fully populate an object this simplify some of code designed around the page fault design. V2 Rebase on top of memory accounting overhaul V3 New rebase on top of more memory accouting changes V4 Rebase on top of no memory account changes (where/when is my delorean when i need it ?) Signed-off-by: Jerome Glisse <jglisse@redhat.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
2011-12-06drm/ttm: merge ttm_backend and ttm_tt V5Jerome Glisse1-45/+21
ttm_backend will only exist with a ttm_tt, and ttm_tt will only be of interest when bound to a backend. Merge them to avoid code and data duplication. V2 Rebase on top of memory accounting overhaul V3 Rebase on top of more memory accounting changes V4 Rebase on top of no memory account changes (where/when is my delorean when i need it ?) V5 make sure ttm is unbound before destroying, change commit message on suggestion from Tormod Volden Signed-off-by: Jerome Glisse <jglisse@redhat.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
2011-10-05vmwgfx: Handle device surface memory limitThomas Hellstrom1-0/+14
Make surfaces swappable. Make sure we honor the maximum amount of surface memory the device accepts. This is done by potentially reading back surface contents not used by the current command submission and storing it locally in buffer objects. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-10-05vmwgfx: Add dmabuf helper functions for pinningJakob Bornecrantz1-0/+33
Signed-off-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-09-06vmwgfx: Implement fence objectsThomas Hellstrom1-13/+13
Will be needed for queries and drm event-driven throttling. As a benefit, they help avoid stale user-space fence handles. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-09-06vmwgfx: Fix confusion caused by using "fence" in various placesThomas Hellstrom1-4/+4
This is needed before we introduce the fence objects. Otherwise this will be even more confusing. The plan is to use the following: seqno: A 32-bit sequence number that may be passed in the fifo. marker: Objects, carrying a seqno, that track fifo submission time. They are used for fifo lag based throttling. fence objects: Kernel space objects, possibly accessible from user-space and carrying a 32-bit seqno together with signaled status. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-01-27ttm: Expand (*populate) to support an array of DMA addresses.Konrad Rzeszutek Wilk1-1/+2
We pass in the array of ttm pages to be populated in the GART/MM of the card (or AGP). Patch titled: "ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32 set." uses the DMA API to make those pages have a proper DMA addresses (in the situation where page_to_phys or virt_to_phys do not give use the DMA (bus) address). Since we are using the DMA API on those pages, we should pass in the DMA address to this function so it can save it in its proper fields (later patches use it). [v2: Added reviewed-by tag] Reviewed-by: Thomas Hellstrom <thellstrom@shipmail.org> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Tested-by: Ian Campbell <ian.campbell@citrix.com>
2010-10-27vmwgfx: Implement a proper GMR eviction mechanismThomas Hellstrom1-19/+62
Use Ben's new range manager hooks to implement a manager for GMRs that manages ids rather than ranges. This means we can use the standard TTM code for binding, unbinding and eviction. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-10-05drm/ttm: restructure to allow driver to plug in alternate memory managerBen Skeggs1-1/+2
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>
2010-04-20drm/ttm: remove io_ field from TTM V6Jerome Glisse1-6/+0
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>
2010-04-20drm/vmwgfx: add support for new TTM fault callback V5Jerome Glisse1-3/+41
This add the support for the new fault callback, does change anything from driver point of view. Improvement: store the aperture base in a variable so that we don't call a function to get it on each fault. Patch hasn't been tested. V2 don't derefence bo->mem.mm_node as it's not NULL only for VRAM or GTT V3 update after io_mem_reserve/io_mem_free callback balancing V4 callback has to ioremap V5 ioremap is done by TTM Signed-off-by: Jerome Glisse <jglisse@redhat.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-01-25drm/vmwgfx: Optimize memory footprint for DMA buffers.Thomas Hellstrom1-0/+9
Use VRAM whenever there is free space for DMA buffers, but use system GMR memory if using VRAM would cause an eviction. This significantly reduces the guest system memory usage for VMs with a large amount of VRAM allocated. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-01-14drm/vmwgfx: Implement a swap_notify callback.Thomas Hellstrom1-1/+7
Unbind GMR bindings on the buffer about to be swapped out. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-01-14drm/vmwgfx: Use bo_driver::move_notify to unbind GMRs.Thomas Hellstrom1-1/+9
This was previously done explicitly for overlay- and fb buffers. Now it's done for any buffer leaving the SYSTEM memory region. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-12-15drm/vmwgfx: Add DRM driver for VMware Virtual GPUJakob Bornecrantz1-0/+229
This commit adds the vmwgfx driver for the VWware Virtual GPU aka SVGA. The driver is under staging the same as Nouveau and Radeon KMS. Hopefully the 2D ioctls are bug free and don't need changing, so that part of the API should be stable. But there there is a pretty big chance that the 3D API will change in the future. Signed-off-by: Thomas Hellström <thellstrom@vmware.com> Signed-off-by: Jakob Bornecrantz <jakob@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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