linux_dsm_epyc7002/drivers/gpu/drm/i915
Marek Szyprowski b827e3ac41 drm: i915: fix common struct sg_table related issues
The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function
returns the number of the created entries in the DMA address space.
However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and
dma_unmap_sg must be called with the original number of the entries
passed to the dma_map_sg().

struct sg_table is a common structure used for describing a non-contiguous
memory buffer, used commonly in the DRM and graphics subsystems. It
consists of a scatterlist with memory pages and DMA addresses (sgl entry),
as well as the number of scatterlist entries: CPU pages (orig_nents entry)
and DMA mapped pages (nents entry).

It turned out that it was a common mistake to misuse nents and orig_nents
entries, calling DMA-mapping functions with a wrong number of entries or
ignoring the number of mapped entries returned by the dma_map_sg()
function.

This driver creatively uses sg_table->orig_nents to store the size of the
allocated scatterlist and ignores the number of the entries returned by
dma_map_sg function. The sg_table->orig_nents is (mis)used to properly
free the (over)allocated scatterlist.

This patch only introduces the common DMA-mapping wrappers operating
directly on the struct sg_table objects to the dmabuf related functions,
so the other drivers, which might share buffers with i915 could rely on
the properly set nents and orig_nents values.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
2020-09-10 08:18:35 +02:00
..
display pwm: Changes for v5.9-rc1 2020-08-14 16:00:09 -07:00
gem drm: i915: fix common struct sg_table related issues 2020-09-10 08:18:35 +02:00
gt drm next for 5.9-rc1 2020-08-05 19:50:06 -07:00
gvt Merge tag 'drm-intel-next-2020-07-15' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2020-07-31 14:42:37 +10:00
selftests IOMMU Updates for Linux v5.9 2020-08-11 14:13:24 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
i915_active_types.h
i915_active.c drm/i915: Allow asynchronous waits on the i915_active barriers 2020-04-06 19:48:06 +01:00
i915_active.h drm/i915: Allow asynchronous waits on the i915_active barriers 2020-04-06 19:48:06 +01:00
i915_buddy.c
i915_buddy.h
i915_cmd_parser.c drm/i915: Whitelist context-local timestamp in the gen9 cmdparser 2020-06-02 16:35:29 +03:00
i915_config.c drm/i915: Replace the hardcoded I915_FENCE_TIMEOUT 2020-05-09 12:57:57 +01:00
i915_debugfs_params.c drm/i915/params: switch to device specific parameters 2020-06-22 23:26:40 +03:00
i915_debugfs_params.h
i915_debugfs.c drm/i915/dg1: add support for the master unit interrupt 2020-07-14 02:47:19 -07:00
i915_debugfs.h drm/i915: have *_debugfs_init() functions return void. 2020-03-18 16:27:22 +01:00
i915_drv.c drm/i915: Introduce gt_init_mmio 2020-07-08 21:07:13 +01:00
i915_drv.h Linux 5.8-rc6 2020-07-24 08:48:05 +10:00
i915_fixed.h
i915_gem_evict.c drm/i915: Handle idling during i915_gem_evict_something busy loops 2020-05-13 14:39:41 -07:00
i915_gem_gtt.c drm/i915: Update dma-attributes for our sg DMA 2020-07-07 11:00:47 +01:00
i915_gem_gtt.h drm/i915: Remove PIN_UPDATE for i915_vma_pin 2020-05-21 17:33:51 +01:00
i915_gem.c drm/i915: Leave vma intact as they are discarded 2020-06-12 10:13:07 +01:00
i915_gem.h drm/i915: Print caller when tainting for CI 2020-07-06 19:21:07 +01:00
i915_getparam.c drm/i915/sseu: Move sseu_info under gt_info 2020-07-08 21:13:09 +01:00
i915_globals.c
i915_globals.h
i915_gpu_error.c drm/i915: Pull printing GT capabilities on error to err_print_gt 2020-07-10 22:06:35 +01:00
i915_gpu_error.h drm/i915: Move the engine mask to intel_gt_info 2020-07-08 21:07:11 +01:00
i915_ioc32.c i915 compat ioctl(): just use drm_ioctl_kernel() 2020-05-01 20:35:26 -04:00
i915_ioc32.h
i915_irq.c drm/i915/dg1: Remove SHPD_FILTER_CNT register programming 2020-07-14 02:47:20 -07:00
i915_irq.h
i915_memcpy.c drm/i915: remove always-defined CONFIG_AS_MOVNTDQA 2020-04-09 00:01:59 +09:00
i915_memcpy.h
i915_mm.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
i915_params.c drm/i915: fix a couple of spelling mistakes in kernel parameter help text 2020-06-30 11:30:02 +03:00
i915_params.h drm/i915: Add psr_safest_params 2020-06-04 19:36:48 -07:00
i915_pci.c drm/i915/dg1: add initial DG-1 definitions 2020-07-14 02:47:17 -07:00
i915_perf_types.h drm/i915/perf: Schedule oa_config after modifying the contexts 2020-03-30 18:20:34 +01:00
i915_perf.c drm/i915/perf: Use GTT when saving/restoring engine GPR 2020-07-14 20:31:05 +03:00
i915_perf.h
i915_pmu.c drm/i915/gt: Always report the sample time for busy-stats 2020-06-18 09:26:54 +01:00
i915_pmu.h
i915_priolist_types.h drm/i915/gt: Prevent timeslicing into unpreemptable requests 2020-06-16 11:34:23 +03:00
i915_pvinfo.h
i915_query.c drm/i915/sseu: Move sseu_info under gt_info 2020-07-08 21:13:09 +01:00
i915_query.h
i915_reg.h drm/i915/dg1: add support for the master unit interrupt 2020-07-14 02:47:19 -07:00
i915_request.c drm/i915: Skip signaling a signaled request 2020-07-13 17:57:54 +01:00
i915_request.h drm/i915: Mark up inline getters as taking a const i915_request 2020-06-16 21:13:58 +01:00
i915_scatterlist.c
i915_scatterlist.h
i915_scheduler_types.h drm/i915: Drop no-semaphore boosting 2020-05-14 06:14:33 +01:00
i915_scheduler.c drm/i915: Don't set queue-priority hint when supressing the reschedule 2020-05-25 15:40:26 +03:00
i915_scheduler.h drm/i915: Mark concurrent submissions with a weak-dependency 2020-05-11 10:54:04 -07:00
i915_selftest.h drm/i915/gem: Implement legacy MI_STORE_DATA_IMM 2020-05-04 15:15:04 +01:00
i915_suspend.c
i915_suspend.h
i915_sw_fence_work.c drm/i915: Immediately execute the fenced work 2020-03-25 13:05:04 +00:00
i915_sw_fence_work.h drm/i915: Immediately execute the fenced work 2020-03-25 13:05:04 +00:00
i915_sw_fence.c drm/i915: Tidy awaiting on dma-fences 2020-05-11 12:56:45 +01:00
i915_sw_fence.h
i915_switcheroo.c drm/i915/switcheroo: use struct drm_device based logging 2020-04-08 13:49:35 +03:00
i915_switcheroo.h
i915_syncmap.c
i915_syncmap.h
i915_sysfs.c
i915_sysfs.h
i915_trace_points.c
i915_trace.h drm/i915: Drop i915_request.i915 backpointer 2020-06-03 13:53:39 +01:00
i915_user_extensions.c
i915_user_extensions.h
i915_utils.c drm/i915: Don't taint when using fault injection 2020-07-06 19:21:07 +01:00
i915_utils.h drm/i915: Remove unused inline function drain_delayed_work() 2020-07-15 10:16:44 +01:00
i915_vgpu.c
i915_vgpu.h
i915_vma_types.h drm/i915: Export ppgtt_bind_vma 2020-07-03 15:14:35 +01:00
i915_vma.c Linux 5.8-rc6 2020-07-24 08:48:05 +10:00
i915_vma.h drm/i915/gt: Remove local entries from GGTT on suspend 2020-05-28 16:55:15 +01:00
intel_device_info.c drm/i915/dg1: add initial DG-1 definitions 2020-07-14 02:47:17 -07:00
intel_device_info.h drm/i915/dg1: add initial DG-1 definitions 2020-07-14 02:47:17 -07:00
intel_dram.c drm/i915/dram: prefer struct drm_device based logging 2020-04-08 13:49:35 +03:00
intel_dram.h
intel_gvt.c drm/i915/params: switch to device specific parameters 2020-06-22 23:26:40 +03:00
intel_gvt.h
intel_memory_region.c
intel_memory_region.h
intel_pch.c drm/i915/dg1: Add fake PCH 2020-07-14 02:47:21 -07:00
intel_pch.h drm/i915/dg1: Add fake PCH 2020-07-14 02:47:21 -07:00
intel_pm.c drm/i915: Document FBC related w/as more thoroughly 2020-07-09 16:50:53 +03:00
intel_pm.h drm/i915: Fix includes and local vars order 2020-05-22 14:40:35 +01:00
intel_region_lmem.c drm/i915/params: switch to device specific parameters 2020-06-22 23:26:40 +03:00
intel_region_lmem.h
intel_runtime_pm.c Merge drm/drm-next into drm-intel-next-queued 2020-06-25 18:05:03 +03:00
intel_runtime_pm.h
intel_sideband.c drm/i915: Added required new PCode commands 2020-05-05 13:59:55 +03:00
intel_sideband.h
intel_uncore.c drm next for 5.9-rc1 2020-08-05 19:50:06 -07:00
intel_uncore.h drm/i915: Use the gt in HAS_ENGINE 2020-07-08 21:07:09 +01:00
intel_wakeref.c drm/i915: Extend intel_wakeref to support delayed puts 2020-03-23 12:51:05 +00:00
intel_wakeref.h drm/i915: Extend intel_wakeref to support delayed puts 2020-03-23 12:51:05 +00:00
intel_wopcm.c drm/i915: Remove cnl pre-prod workarounds 2020-05-04 18:44:52 +03:00
intel_wopcm.h
Kconfig
Kconfig.debug
Kconfig.profile drm/i915: Replace the hardcoded I915_FENCE_TIMEOUT 2020-05-09 12:57:57 +01:00
Kconfig.unstable
Makefile drm/i915: Move sseu debugfs under gt/ 2020-07-08 21:40:15 +01:00
vlv_suspend.c
vlv_suspend.h