cd3681976c
The general direction at this time is to phase out pread/write ioctls and
not support them in future products. The ioctls have already been disabled
in i915 for future products. This means libdrm must handle the absence of
these ioctls. This patch does this by modifying drm_intel_gem_bo_subdata()
and drm_intel_gem_bo_get_subdata() to do the read/write using the
pread/pwrite ioctls first but when these ioctls are unavailable fall back
to doing the read/write using a combination of mmap and memcpy.
A similar solution was added to igt-gpu-tools in commit
ad5eb02eb3 ("lib/ioctl_wrappers: Keep IGT working without pread/pwrite
ioctls").
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
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|---|---|---|
| .gitlab-ci | ||
| amdgpu | ||
| android | ||
| data | ||
| etnaviv | ||
| exynos | ||
| freedreno | ||
| include/drm | ||
| intel | ||
| libkms | ||
| man | ||
| nouveau | ||
| omap | ||
| radeon | ||
| tegra | ||
| tests | ||
| vc4 | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| CONTRIBUTING.rst | ||
| CleanSpec.mk | ||
| Makefile.sources | ||
| README.rst | ||
| RELEASING | ||
| core-symbols.txt | ||
| libdrm.pc.in | ||
| libdrm_lists.h | ||
| libdrm_macros.h | ||
| libsync.h | ||
| meson.build | ||
| meson_options.txt | ||
| symbols-check.py | ||
| 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.rst
libdrm - userspace library for drm
----------------------------------
This is libdrm, a userspace library for accessing the DRM, direct rendering
manager, on Linux, BSD and other operating systems 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.
New functionality in the kernel DRM drivers typically requires a new libdrm,
but a new libdrm will always work with an older kernel.
libdrm is a low-level library, typically used by graphics drivers such as
the Mesa drivers, the X drivers, libva and similar projects.
Compiling
---------
To set up meson:
meson builddir/
By default this will install into /usr/local, you can change your prefix
with --prefix=/usr (or `meson configure builddir/ -Dprefix=/usr` after
the initial meson setup).
Then use ninja to build and install:
ninja -C builddir/ install
If you are installing into a system location you will need to run install
separately, and as root.