f6b1b5b7c9
This will expose functionality supported by newer kernel interfaces. Current userspace uses the chipset to determine which classes are likely exposed, which generally works pretty well, but isn't as flexible as it could be. Unfortunately, the G98:GF100 video code in Mesa is still relying on the kernel exposing incorrect vdec classes on some chipsets. The ABI16 kernel interfaces have a workaround for this in place, but that will no longer be available once libdrm supports NVIF. To prevent a regression when NVIF support is added, if there's no kernel support for NVIF, libdrm will magic up a class list containing correct vdec classes anyway instead of failing with -ENODEV. v2. - add description of abi16/vdec workaround - add description of sclass/mclass - leave client-provided pointer unmodified on abi16_sclass() failure Signed-off-by: Ben Skeggs <bskeggs@redhat.com> Tested-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> |
||
---|---|---|
amdgpu | ||
exynos | ||
freedreno | ||
include/drm | ||
intel | ||
libkms | ||
m4 | ||
man | ||
nouveau | ||
omap | ||
radeon | ||
tegra | ||
tests | ||
.gitignore | ||
Android.mk | ||
CleanSpec.mk | ||
Makefile.am | ||
Makefile.sources | ||
README | ||
RELEASING | ||
autogen.sh | ||
configure.ac | ||
libdrm.pc.in | ||
libdrm_lists.h | ||
libdrm_macros.h | ||
util_double_list.h | ||
util_math.h | ||
xf86atomic.h | ||
xf86drm.c | ||
xf86drm.h | ||
xf86drmHash.c | ||
xf86drmHash.h | ||
xf86drmMode.c | ||
xf86drmMode.h | ||
xf86drmRandom.c | ||
xf86drmRandom.h | ||
xf86drmSL.c |
README
libdrm - userspace library for drm This is libdrm, a userspace library for accessing the DRM, direct rendering manager, on Linux, BSD and other operating systes that support the ioctl interface. The library provides wrapper functions for the ioctls to avoid exposing the kernel interface directly, and for chipsets with drm memory manager, support for tracking relocations and buffers. libdrm is a low-level library, typically used by graphics drivers such as the Mesa DRI drivers, the X drivers, libva and similar projects. New functionality in the kernel DRM drivers typically requires a new libdrm, but a new libdrm will always work with an older kernel. Compiling --------- libdrm is a standard autotools packages and follows the normal configure, build and install steps. The first step is to configure the package, which is done by running the configure shell script: ./configure By default, libdrm will install into the /usr/local/ prefix. If you want to install this DRM to replace your system copy, pass --prefix=/usr and --exec-prefix=/ to configure. If you are building libdrm from a git checkout, you first need to run the autogen.sh script. You can pass any options to autogen.sh that you would other wise pass to configure, or you can just re-run configure with the options you need once autogen.sh finishes. Next step is to build libdrm: make and once make finishes successfully, install the package using make install If you are install into a system location, you will need to be root to perform the install step.