From: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx> This patch series adds support for creating/using Stolen memory backed objects. Despite being a unified memory architecture (UMA) some bits of memory are more equal than others. In particular we have the thorny issue of stolen memory, memory stolen from the system by the BIOS and reserved for igfx use. Stolen memory is required for some functions of the GPU and display engine, but in general it goes wasted. Whilst we cannot return it back to the system, we need to find some other method for utilising it. As we do not support direct access to the physical address in the stolen region, it behaves like a different class of memory, closer in kin to local GPU memory. This strongly suggests that we need a placement model like TTM if we are to fully utilize these discrete chunks of differing memory. To add support for creating Stolen memory backed objects, we extend the drm_i915_gem_create structure, by adding a new flag through which user can specify the preference to allocate the object from stolen memory, which if set, an attempt will be made to allocate the object from stolen memory subject to the availability of free space in the stolen region. This patch series adds support for clearing buffer objects via CPU/GTT. This is particularly useful for clearing out the memory from stolen region, but can also be used for other shmem allocated objects. Currently being used for buffers allocated in the stolen region. Also adding support for stealing purgable stolen pages, if we run out of stolen memory when trying to allocate an object. v2: Added support for read/write from/to objects not backed by shmem using the pread/pwrite interface. Also extended the current get_aperture ioctl to retrieve the total and available size of the stolen region. v3: Removed the extended get_aperture ioctl patch 5 (to be submitted as part of other patch series), addressed comments by Chris about pread/pwrite for non shmem backed objects. v4: Rebased to the latest drm-intel-nightly. v5: Addressed comments, replaced patch 1/4 "Clearing buffers via blitter engine" by "Clearing buffers via CPU/GTT". v6: Rebased to the latest drm-intel-nightly, Addressed comments, updated stolen memory purging logic by maintaining a list for purgable stolen memory objects, enabled pread/pwrite for all non-shmem backed objects without tiling restrictions. v7: Addressed comments, compiler optimization, new patch added for correct error code propagation to the userspace. v8: Added a new patch to the series to Migrate stolen objects before hibernation, as stolen memory is not preserved across hibernation. Added correct error propagation for shmem as well non-shmem backed object allocation. v9: Addressed comments, use of insert_page helper function to map object page by page which can be helpful in low aperture space availability. v10: Addressed comments, use insert_page for clearing out the stolen memory v11: Addressed comments, 3 new patches added to support allocation from Stolen memory 1. Allow use of i915_gem_object_get_dma_address for stolen backed objects 2. Use insert_page for pwrite_fast 3. Fail the execbuff using stolen objects as batchbuffers v12: Addressed comments, Removed patch "Fail the execbuff using stolen objects as batchbuffers" v13: Addressed comments, Added 2 patches to detect Intel RST and disable stolen for persistent data if RST device found 1. acpi: Export acpi_bus_type 2. drm/i915: Disable use of stolen area by User when Intel RST is present v14: Addressed comments, Added 2 base patches to the series 1. drm/i915: Add support for mapping an object page by page 2. drm/i915: Introduce i915_gem_object_get_dma_address() v15: Addressed comments, Disabled stolen memory by default v16: Addressed comments, Added low level rpm assertions, Enabled stolen memory v17: Addressed comments v18: Rebased and fixed issue v19: Added changes to resolve CI test failures This can be verified using IGT tests: igt/gem_stolen, igt/gem_create, igt/gem_pread, igt/gem_pwrite Ankitprasad Sharma (6): drm/i915: Use insert_page for pwrite_fast drm/i915: Clearing buffer objects via CPU/GTT drm/i915: Support for creating Stolen memory backed objects drm/i915: Propagating correct error codes to the userspace drm/i915: Support for pread/pwrite from/to non shmem backed objects drm/i915: Disable use of stolen area by User when Intel RST is present Chris Wilson (4): drm/i915: Add support for mapping an object page by page drm/i915: Introduce i915_gem_object_get_dma_address() drm/i915: Add support for stealing purgable stolen pages drm/i915: Migrate stolen objects before hibernation drivers/char/agp/intel-gtt.c | 9 + drivers/gpu/drm/i915/i915_debugfs.c | 6 +- drivers/gpu/drm/i915/i915_dma.c | 6 + drivers/gpu/drm/i915/i915_drv.c | 17 +- drivers/gpu/drm/i915/i915_drv.h | 58 ++- drivers/gpu/drm/i915/i915_gem.c | 635 ++++++++++++++++++++++++--- drivers/gpu/drm/i915/i915_gem_batch_pool.c | 4 +- drivers/gpu/drm/i915/i915_gem_context.c | 4 +- drivers/gpu/drm/i915/i915_gem_gtt.c | 67 +++ drivers/gpu/drm/i915/i915_gem_gtt.h | 5 + drivers/gpu/drm/i915/i915_gem_render_state.c | 7 +- drivers/gpu/drm/i915/i915_gem_stolen.c | 279 ++++++++++-- drivers/gpu/drm/i915/i915_guc_submission.c | 52 ++- drivers/gpu/drm/i915/intel_acpi.c | 7 + drivers/gpu/drm/i915/intel_display.c | 5 +- drivers/gpu/drm/i915/intel_fbdev.c | 12 +- drivers/gpu/drm/i915/intel_lrc.c | 10 +- drivers/gpu/drm/i915/intel_overlay.c | 4 +- drivers/gpu/drm/i915/intel_pm.c | 13 +- drivers/gpu/drm/i915/intel_ringbuffer.c | 27 +- include/drm/intel-gtt.h | 3 + include/uapi/drm/i915_drm.h | 41 ++ 22 files changed, 1105 insertions(+), 166 deletions(-) -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
