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path: root/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
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2018-02-16drm: move read_domains and write_domain into i915Christian König1-2/+2
i915 is the only driver using those fields in the drm_gem_object structure, so they only waste memory for all other drivers. Move the fields into drm_i915_gem_object instead and patch the i915 code with the following sed commands: sed -i "s/obj->base.read_domains/obj->read_domains/g" drivers/gpu/drm/i915/*.c drivers/gpu/drm/i915/*/*.c sed -i "s/obj->base.write_domain/obj->write_domain/g" drivers/gpu/drm/i915/*.c drivers/gpu/drm/i915/*/*.c Change is only compile tested. v2: move fields around as suggested by Chris. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180216124338.9087-1-christian.koenig@amd.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2018-02-15drm/i915/selftests: fix inconsistent IS_ERR and PTR_ERRGustavo A. R. Silva1-1/+1
Fix inconsistent IS_ERR and PTR_ERR in shrink_boom. The proper pointer to use is _explode_ instead of _purge_. This issue was detected with the help of Coccinelle. Fixes: fe215c8bc426 ("drm/i915/selftests: add missing gtt shrinker test") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180214211234.GA22341@embeddedgus Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2018-02-01drm/i915/selftests: add missing gtt shrinker testMatthew Auld1-0/+84
Try to catch a bug we've seen in the wild where the shrinker purges the pd/pdp from under us while allocating our paging structures. References: https://bugs.freedesktop.org/show_bug.cgi?id=104773 Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180131191453.12676-1-matthew.auld@intel.com Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180131214440.7141-2-chris@chris-wilson.co.uk
2018-01-02drm/i915/selftests: Tweak igt_ggtt_page to speed it upChris Wilson1-16/+14
Reduce the number of GGTT PTE operations to speed the test up, but we reduce the likelihood of spotting a coherency error in those operations. However, Broxton is sporadically timing on this test, presumably because its GGTT operations are all uncached. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171223110407.21402-1-chris@chris-wilson.co.uk
2017-12-12drm/i915: make mappable struct resource centricMatthew Auld1-2/+2
Now that we are using struct resource to track the stolen region, it is more convenient if we track the mappable region in a resource as well. v2: prefer iomap and gmadr naming scheme prefer DEFINE_RES_MEM Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171211151822.20953-8-matthew.auld@intel.com
2017-11-17drm/i915/selftests: Report ENOMEM clearly for an allocation failureChris Wilson1-10/+26
If we can not run the drunk_hole test because we couldn't allocate the memory for the permutation array (even after we tried trimming the size), report a clear ENOMEM. Similary, if we are asked to operate on a hole too small for ourselves, make it skip quietly. v2: Avoid malloc(0) since that returns ZERO_SIZE_PTR not NULL. v3: Fixup similar construction for lowlevel_hole v4: Use u64 >> 1 to avoid 64b div. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171117101732.4335-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171117162945.16390-1-chris@chris-wilson.co.uk
2017-11-16drm/i915/selftests: exercise_ggtt may have nothing to doChris Wilson1-1/+1
When operating on the live_ggtt we have to find a usuable hole for our test. It is possible for there to be no hole we can use, so initialise the err to 0 for the early exit. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171115152558.31252-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
2017-11-14drm/i915/selftests: Always initialise errChris Wilson1-4/+4
smatch does not track initialised values as well as gcc, and this triggers many warnings by smatch not presented by gcc. Silence smatch by initialising the error values to -ENODEV, which we use to denote internal errors. (If we see a selftest fail with a silent -ENODEV, we know smatch was right!) v2: smatch was right about igt_create_vma(), it may unlikely fail on the first object allocation which we want to be loud about. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171114223346.25958-1-chris@chris-wilson.co.uk Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
2017-11-07drm/i915/selftests: Take rpm wakeref around GGTT lowlevel testsChris Wilson1-0/+4
The vma routines are responsible for acquiring the device rpm wakeref before they poke the HW. However, some of the selftests bypass the higher level vma routines in order to poke directly at the lowlevel GGTT functions; these are then responsible for managing rpm themselves. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171107114051.10583-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com>
2017-10-09drm/i915: s/sg_mask/sg_page_sizes/Matthew Auld1-4/+4
It's a little unclear what the sg_mask actually is, so prefer the more meaningful name of sg_page_sizes. Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171009110024.29114-1-matthew.auld@intel.com Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2017-10-07drm/i915: introduce page_size membersMatthew Auld1-1/+4
In preparation for supporting huge gtt pages for the ppgtt, we introduce page size members for gem objects. We fill in the page sizes by scanning the sg table. v2: pass the sg_mask to set_pages v3: calculate the sg_mask inline with populating the sg_table where possible, and pass to set_pages along with the pages. v4: bunch of improvements from Joonas v5: fix num_pages blunder introduce i915_sg_page_sizes helper v6: prefer GEM_BUG_ON(sizes == 0) Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel@ffwll.ch> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-7-matthew.auld@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-6-chris@chris-wilson.co.uk
2017-10-07drm/i915: push set_pages down to the callersMatthew Auld1-5/+7
Each backend is now responsible for calling __i915_gem_object_set_pages upon successfully gathering its backing storage. This eliminates the inconsistency between the async and sync paths, which stands out even more when we start throwing around an sg_mask in a later patch. Suggested-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-6-matthew.auld@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-5-chris@chris-wilson.co.uk
2017-06-22drm/i915: pass the vma to insert_entriesMatthew Auld1-2/+8
The vma already contains most of the information we need for insertion. But also in preparation for supporting huge gtt pages, it would be useful to know the details of the vma, such that we can we can easily determine the page sizes we are allowed to use when inserting into the 48b PPGTT. This is especially true for 64K where we can't just arbitrarily use it, since we require aligning/padding the vm space to 2M, which sometimes we can't enforce in the upper levels. Suggested-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170622095836.6800-1-matthew.auld@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2017-03-13drm/i915/selftests: Fix error path for ggtt walk_hole()Chris Wilson1-6/+7
The patch 6e32ab3d4777: "drm/i915: Fill different pages of the GTT" from Feb 13, 2017, leads to the following static checker warning: drivers/gpu/drm/i915/selftests/i915_gem_gtt.c:583 walk_hole() error: 'vma' dereferencing possible ERR_PTR() Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Fixes: 6e32ab3d4777 ("drm/i915: Fill different pages of the GTT" Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: <drm-intel-fixes@lists.freedesktop.org> Link: http://patchwork.freedesktop.org/patch/msgid/20170313100750.2685-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com>
2017-03-09drm/i915/selftests: don't leak the gem objectMatthew Auld1-2/+7
For our fake dma objects we can leak the underlying gem object if we fail to pin our "backing storage". [ 39.952618] ============================================================================= [ 39.952625] BUG mock_object (Tainted: G U ): Objects remaining in mock_object on __kmem_cache_shutdown() [ 39.952629] ----------------------------------------------------------------------------- [ 39.952633] Disabling lock debugging due to kernel taint [ 39.952635] INFO: Slab 0xffffea00086c6a00 objects=21 used=1 fp=0xffff88021b1abc00 flags=0x5fff8000008100 [ 39.952640] CPU: 1 PID: 1258 Comm: drv_selftest Tainted: G BU 4.10.0+ #46 [ 39.952641] Hardware name: Apple Inc. MacBookPro11,1/Mac-189A3D4F975D5FFC, BIOS MBP111.88Z.0138.B17.1602221718 02/22/2016 [ 39.952642] Call Trace: [ 39.952648] dump_stack+0x4d/0x6f [ 39.952651] slab_err+0x9d/0xb0 [ 39.952654] ? ksm_migrate_page+0xe0/0xe0 [ 39.952657] ? on_each_cpu_cond+0x9a/0xc0 [ 39.952658] ? __kmalloc+0x1af/0x1c0 [ 39.952660] ? __kmem_cache_shutdown+0x173/0x3e0 [ 39.952661] __kmem_cache_shutdown+0x196/0x3e0 [ 39.952664] kmem_cache_destroy+0xa0/0x150 [ 39.952708] mock_device_release+0x113/0x140 [i915] [ 39.952726] drm_dev_release+0x20/0x40 [drm] [ 39.952735] drm_dev_unref+0x23/0x30 [drm] [ 39.952768] i915_gem_gtt_mock_selftests+0x55/0x70 [i915] [ 39.952803] __run_selftests+0x169/0x1c0 [i915] [ 39.952805] ? 0xffffffffa0151000 [ 39.952840] i915_mock_selftests+0x30/0x60 [i915] [ 39.952869] i915_init+0xc/0x78 [i915] [ 39.952870] ? 0xffffffffa0151000 [ 39.952872] do_one_initcall+0x43/0x170 [ 39.952874] ? __vunmap+0x81/0xd0 [ 39.952875] ? kmem_cache_alloc_trace+0x37/0x170 [ 39.952877] ? do_init_module+0x27/0x1f8 [ 39.952879] do_init_module+0x5f/0x1f8 [ 39.952881] load_module+0x2423/0x29b0 [ 39.952882] ? __symbol_put+0x40/0x40 [ 39.952885] ? kernel_read_file+0x1a3/0x1c0 [ 39.952887] SYSC_finit_module+0xbc/0xf0 [ 39.952889] SyS_finit_module+0xe/0x10 [ 39.952892] entry_SYSCALL_64_fastpath+0x13/0x94 v2: use onion teardown and favour i915_gem_object_put Fixes: 8d28ba4568f4 ("drm/i915: Exercise filling the top/bottom portions of the ppgtt") Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170306235414.23407-2-matthew.auld@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2017-02-25drm/i915: Assert all sg are initialised in fake_dma_object for selftestsChris Wilson1-0/+2
Double check that we allocated the right amount of scatterlist elements for our obj->size. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.william.auld@gmail.com> Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170225181122.4788-1-chris@chris-wilson.co.uk
2017-02-24drm/i915: Timeout lowlevel_hole GTT selftest earlyChris Wilson1-6/+7
Check for a timeout in the lowlevel_hole GTT before we allocate state for that pass, as our cleanup phase stops on the iteration before the timeout. References: https://bugs.freedesktop.org/show_bug.cgi?id=99947 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.william.auld@gmail.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170224193315.21072-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
2017-02-15drm/i915: Convert clflushed pagetables over to WC mapsChris Wilson1-4/+4
We flush the entire page every time we update a few bytes, making the update of a page table many, many times slower than is required. If we create a WC map of the page for our updates, we can avoid the clflush but incur additional cost for creating the pagetable. We amoritize that cost by reusing page vmappings, and only changing the page protection in batches. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
2017-02-14drm/i915: Silence compiler for GTT selftestsChris Wilson1-1/+1
gcc-4.7 spotted that In file included from drivers/gpu/drm/i915/i915_gem_gtt.c:3791:0: drivers/gpu/drm/i915/selftests/i915_gem_gtt.c: In function ‘pot_hole’: drivers/gpu/drm/i915/selftests/i915_gem_gtt.c:594:6: error: ‘err’ may be used uninitialized in this function [-Werror=maybe-uninitialized] So set it to 0 should we ever skip over a hole smaller than a few pages. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170214113756.27834-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com>
2017-02-14drm/i915: Avoid overflow in computing pot_hole loop terminationChris Wilson1-1/+1
When using the mock_ppgtt selftest, the GTT is large enough to cause an overflow in pot_hole() when adding 2 pages to the address. Avoid the overflow by computing the final valid address and iterating up to that address. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170214092344.12330-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com>
2017-02-13drm/i915: Exercise crossing pot boundaries in the GTTChris Wilson1-0/+94
As the page-table trees within the GTT are naturally aligned to power-of-two boundaries, by inserting an object that crosses a power-of-two (and the power-of-two intervals) we can quickly check the code for errors in switching between levels in the tree. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-46-chris@chris-wilson.co.uk
2017-02-13drm/i915: Exercise manipulate of single pages in the GGTTChris Wilson1-0/+91
Move a single page of an object around within the GGTT and check coherency of writes and reads. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-45-chris@chris-wilson.co.uk
2017-02-13drm/i915: Add mock tests for GTT/VMA handlingChris Wilson1-0/+43
Use the live tests against the mock ppgtt for quick testing on all platforms of the VMA layer. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-44-chris@chris-wilson.co.uk
2017-02-13drm/i915: Add mock exercise for i915_gem_gtt_insertChris Wilson1-0/+208
i915_gem_gtt_insert should allocate from the available free space in the GTT, evicting as necessary to create space. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-43-chris@chris-wilson.co.uk
2017-02-13drm/i915: Add mock exercise for i915_gem_gtt_reserveChris Wilson1-0/+195
i915_gem_gtt_reserve should put the node exactly as requested in the GTT, evicting as required. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-42-chris@chris-wilson.co.uk
2017-02-13drm/i915: Use fault-injection to force the shrinker to run in live GTT testsChris Wilson1-0/+98
It is possible whilst allocating the page-directory tree for a ppgtt bind that the shrinker may run and reap unused parts of the tree. If the shrinker happens to remove a chunk of the tree that the allocate_va_range has already processed, we may then try to insert into the dangling tree. This test uses the fault-injection framework to force the shrinker to be invoked before we allocate new pages, i.e. new chunks of the PD tree. References: https://bugs.freedesktop.org/show_bug.cgi?id=99295 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com>
2017-02-13drm/i915: Live testing of lowlevel GTT operationsChris Wilson1-0/+98
Directly test allocating the va range and clearing it, this bypasses the use of i915_vma_bind() and inserting the pages to focus on testing of the pagetables. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-32-chris@chris-wilson.co.uk
2017-02-13drm/i915: Exercise filling and removing random ranges from the live GTTChris Wilson1-0/+113
Test the low-level i915_address_space interfaces to sanity check the live insertion/removal of address ranges. v2: Split out the low-level operations to a new test Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-31-chris@chris-wilson.co.uk
2017-02-13drm/i915: Fill different pages of the GTTChris Wilson1-0/+93
Exercise filling different pages of the GTT v2: Walk all holes until we timeout Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-30-chris@chris-wilson.co.uk
2017-02-13drm/i915: Exercise filling the top/bottom portions of the global GTTChris Wilson1-1/+60
Same test as previously for the per-process GTT instead applied to the global GTT. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-29-chris@chris-wilson.co.uk
2017-02-13drm/i915: Exercise filling the top/bottom portions of the ppgttChris Wilson1-0/+362
Allocate objects with varying number of pages (which should hopefully consist of a mixture of contiguous page chunks and so coalesced sg lists) and check that the sg walkers in insert_pages cope. v2: Check both small <-> large Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-28-chris@chris-wilson.co.uk
2017-02-13drm/i915: Add initial selftests for i915_gem_gttChris Wilson1-0/+99
Simple starting point for adding selftests for i915_gem_gtt, first try creating a ppGTT and filling it. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-27-chris@chris-wilson.co.uk
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