linux_dsm_epyc7002/drivers/gpu/drm
Arun Siluvery 22a916aaa1 drm/i915: Emit even number of dwords when emitting LRIs
The number of DWords should be even when doing ring emits as
command sequences require QWord alignment.

There was some discussion about the maximum length of the MI_LRI
command. Quoting Mika

"I did some test with bdw:

"The maximum is 128 writes, resulting the 8 bit length
field of the command being 0xff, thus following the spec.
The 128'th write went through.

"Perhaps the max command length is then less in older gens?

"Perhaps WARN_ON(x > 128) in MI_LOAD_REGISTER_IMM would be in place
but one needs minor tweak to command parser a bit also then.

	#define I915_MAX_WA_REGS 16

keeps us safe for now atleast."

Ville commented that on pre-gen6 the length field seems to be
restricted to 0x3f though. So for all cases we should be ok.

v2: user LRI variant that can write multiple regs in one go (Damien).
We can simply insert one NOP at the end instead of one per register write.

Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
[danvet: Add a summary of the MI_LRI length discussion.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2014-10-24 16:34:15 +02:00
..
armada drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
ast drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
bochs drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
bridge
cirrus drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
exynos drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
gma500 drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
i2c
i810 drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
i915 drm/i915: Emit even number of dwords when emitting LRIs 2014-10-24 16:34:15 +02:00
mga drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
mgag200 drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
msm drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
nouveau drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
omapdrm drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
panel drm/panel/simple: add optronics B101XTN01.0 (v3) 2014-09-10 11:19:07 -04:00
qxl drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
r128 drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
radeon drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
rcar-du drm/rcar-du: Add OF support 2014-09-15 11:55:47 +03:00
savage drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
shmobile drm/shmob: Update copyright notice 2014-09-15 11:34:07 +03:00
sis drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
sti Linux 3.17-rc5 2014-09-16 11:38:04 +10:00
tdfx drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
tegra drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
tilcdc drm/tilcdc: panel: Add support for enable GPIO 2014-09-17 10:55:27 +10:00
ttm drm/ttm: Clean usage of ttm_io_prot() with TTM_PL_FLAG_CACHED 2014-09-23 15:00:26 +10:00
udl drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
via drm: move drm_mmap to <drm/drm_legacy.h> 2014-09-24 11:43:07 +10:00
vmwgfx Linux 3.17-rc5 2014-09-16 11:38:04 +10:00
ati_pcigart.c drm: split ati_pcigart.h out of drmP.h 2014-09-12 14:11:14 +10:00
drm_agpsupport.c drm: move AGP definitions harder 2014-09-10 17:40:11 +10:00
drm_auth.c drm: Move piles of functions from drmP.h to drm_internal.h 2014-09-12 11:16:29 +02:00
drm_bufs.c drm: Move __drm_pci_free to drm_legacy.h 2014-09-12 11:08:56 +02:00
drm_cache.c
drm_context.c drm: mark drm_context support as legacy 2014-08-05 19:38:12 +02:00
drm_crtc_helper.c
drm_crtc_internal.h
drm_crtc.c Linux 3.17-rc5 2014-09-16 11:38:04 +10:00
drm_debugfs.c drm: Move piles of functions from drmP.h to drm_internal.h 2014-09-12 11:16:29 +02:00
drm_dma.c drm: Move legacy buffer structures to <drm/drm_legacy.h> 2014-09-12 15:28:12 +02:00
drm_dp_helper.c
drm_dp_mst_topology.c drm: Don't return 0 for a value used as a denominator 2014-08-14 21:24:29 +02:00
drm_drv.c drm: change drm_err return type to void 2014-09-24 11:42:36 +10:00
drm_edid_load.c
drm_edid.c drm/edid: Reduce horizontal timings for pixel replicated modes 2014-09-15 08:56:29 +02:00
drm_encoder_slave.c
drm_fb_cma_helper.c
drm_fb_helper.c Merge tag 'drm-intel-next-2014-09-01' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-09-03 08:30:48 +10:00
drm_flip_work.c
drm_fops.c drm: unexport drm_global_mutex 2014-09-12 11:19:47 +02:00
drm_gem_cma_helper.c
drm_gem.c drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
drm_global.c
drm_hashtab.c list: fix order of arguments for hlist_add_after(_rcu) 2014-08-06 18:01:24 -07:00
drm_info.c drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
drm_internal.h drm: Move internal debugfs functions to drm_internal.h 2014-09-24 11:43:35 +10:00
drm_ioc32.c
drm_ioctl.c drm: Purge ioctl forward declarations from drmP.h 2014-09-12 15:27:47 +02:00
drm_irq.c drm: Move vblank related module options into drm_irq.c 2014-09-12 11:14:56 +02:00
drm_legacy.h drm: Create drm legacy driver header 2014-09-12 11:08:55 +02:00
drm_lock.c drm: unexport drm_global_mutex 2014-09-12 11:19:47 +02:00
drm_memory.c drm: Move drm_memory.c map support declarations to <drm/drm_legacy.h> 2014-09-12 15:28:12 +02:00
drm_mipi_dsi.c drm/mipi-dsi: consider low power transmission 2014-09-20 00:56:08 +09:00
drm_mm.c
drm_modes.c drm: Perform cmdline mode parsing during connector initialisation 2014-08-06 14:50:12 +02:00
drm_modeset_lock.c drm: Docbook fixes 2014-08-14 21:24:17 +02:00
drm_of.c
drm_panel.c
drm_pci.c drm: Move legacy buffer structures to <drm/drm_legacy.h> 2014-09-12 15:28:12 +02:00
drm_plane_helper.c
drm_platform.c drm: Goody bye, drm_bus! 2014-09-10 17:43:10 +10:00
drm_prime.c drm: Extract <drm/drm_gem.h> 2014-09-24 11:43:41 +10:00
drm_probe_helper.c drm: Perform cmdline mode parsing during connector initialisation 2014-08-06 14:50:12 +02:00
drm_rect.c
drm_scatter.c drm: Move sg functions into drm_legacy.h 2014-09-12 11:08:54 +02:00
drm_sysfs.c drm: Move piles of functions from drmP.h to drm_internal.h 2014-09-12 11:16:29 +02:00
drm_trace_points.c
drm_trace.h
drm_vm.c drm: Move drm_vm_open_locked into drm_internal.h 2014-09-24 11:43:20 +10:00
drm_vma_manager.c
Kconfig drm: merge drm_usb into udl 2014-09-10 17:43:27 +10:00
Makefile drm: merge drm_usb into udl 2014-09-10 17:43:27 +10:00
README.drm

************************************************************
* For the very latest on DRI development, please see:      *
*     http://dri.freedesktop.org/                          *
************************************************************

The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).

The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:

    1. The DRM provides synchronized access to the graphics hardware via
       the use of an optimized two-tiered lock.

    2. The DRM enforces the DRI security policy for access to the graphics
       hardware by only allowing authenticated X11 clients access to
       restricted regions of memory.

    3. The DRM provides a generic DMA engine, complete with multiple
       queues and the ability to detect the need for an OpenGL context
       switch.

    4. The DRM is extensible via the use of small device-specific modules
       that rely extensively on the API exported by the DRM module.


Documentation on the DRI is available from:
    http://dri.freedesktop.org/wiki/Documentation
    http://sourceforge.net/project/showfiles.php?group_id=387
    http://dri.sourceforge.net/doc/

For specific information about kernel-level support, see:

    The Direct Rendering Manager, Kernel Support for the Direct Rendering
    Infrastructure
    http://dri.sourceforge.net/doc/drm_low_level.html

    Hardware Locking for the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/hardware_locking_low_level.html

    A Security Analysis of the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/security_low_level.html