kernel/linux.git/drivers/gpu/drm/ttm/ttm_module.c, branch v6.19.11

drm/ttm: add pgprot handling for RISC-V

2025-10-28T08:19:46+00:00

The RISC-V Svpbmt privileged extension provides support for overriding page memory coherency attributes, and, along with vendor extensions like Xtheadmae, supports pgprot_{writecombine,noncached} on RISC-V. Adapt the codepath that maps ttm_write_combined to pgprot_writecombine and ttm_noncached to pgprot_noncached to RISC-V, to allow proper page access attributes. Signed-off-by: Icenowy Zheng Tested-by: Han Gao Acked-by: Christian König Signed-off-by: Christian König Link: https://lore.kernel.org/r/20251020053523.731353-1-uwu@icenowy.me

LoongArch: Add writecombine support for drm

2022-06-03T12:09:27+00:00

LoongArch maintains cache coherency in hardware, but its WUC attribute (Weak-ordered UnCached, which is similar to WC) is out of the scope of cache coherency machanism. This means WUC can only used for write-only memory regions. Cc: Daniel Vetter Cc: dri-devel@lists.freedesktop.org Reviewed-by: WANG Xuerui Reviewed-by: Jiaxun Yang Signed-off-by: Huacai Chen

drm/ttm: fix compilation on ARCH=um

2022-01-14T12:30:56+00:00

Even if it's probably not really useful, it can get selected by e.g. randconfig builds, and then failing to compile is an annoyance. Unfortunately, it's hard to fix in Kconfig, since DRM_TTM is selected by many things that don't really depend on any specific architecture, and just depend on PCI (which is indeed now available in ARCH=um via simulation/emulation). Fix this in the code instead by just ifdef'ing the relevant two lines that depend on "real X86". Reported-by: Geert Uytterhoeven Signed-off-by: Johannes Berg Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20211220111519.a4c8c6eff702.Ie4cf4e68698f6a9f546b83379bc52c266504424f@changeid

Merge drm/drm-next into drm-misc-next

2021-09-14T07:25:30+00:00

Kickstart new drm-misc-next cycle. Signed-off-by: Maxime Ripard

drm/ttm: add some general module kerneldoc

2021-09-09T11:25:45+00:00

For now just a brief description of what TTM is all about. Signed-off-by: Christian König Reviewed-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20210908132933.3269-3-christian.koenig@amd.com

drm/ttm: Initialize debugfs from ttm_global_init()

2021-07-22T10:09:12+00:00

We create a bunch of debugfs entries as a side-effect of ttm_global_init() and then never clean them up. This isn't usually a problem because we free the whole debugfs directory on module unload. However, if the global reference count ever goes to zero and then ttm_global_init() is called again, we'll re-create those debugfs entries and debugfs will complain in dmesg that we're creating entries that already exist. This patch fixes this problem by changing the lifetime of the whole TTM debugfs directory to match that of the TTM global state. Signed-off-by: Jason Ekstrand Reviewed-by: Daniel Vetter Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20210721152358.2893314-6-jason@jlekstrand.net

drm/ttm: Add a generic TTM memcpy move for page-based iomem

2021-06-07T14:07:08+00:00

The internal ttm_bo_util memcpy uses ioremap functionality, and while it probably might be possible to use it for copying in- and out of sglist represented io memory, using io_mem_reserve() / io_mem_free() callbacks, that would cause problems with fault(). Instead, implement a method mapping page-by-page using kmap_local() semantics. As an additional benefit we then avoid the occasional global TLB flushes of ioremap() and consuming ioremap space, elimination of a critical point of failure and with a slight change of semantics we could also push the memcpy out async for testing and async driver development purposes. A special linear iomem iterator is introduced internally to mimic the old ioremap behaviour for code-paths that can't immediately be ported over. This adds to the code size and should be considered a temporary solution. Looking at the code we have a lot of checks for iomap tagged pointers. Ideally we should extend the core memremap functions to also accept uncached memory and kmap_local functionality. Then we could strip a lot of code. Cc: Christian König Signed-off-by: Thomas Hellström Reviewed-by: Christian König Link: https://lore.kernel.org/r/20210602083818.241793-4-thomas.hellstrom@linux.intel.com

drm/ttm: drop sysfs directory

2021-02-09T16:28:01+00:00

Not used any more. Signed-off-by: Christian König Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20210208133226.36955-3-christian.koenig@amd.com

drm/ttm: add debugfs directory v2

2021-01-20T11:56:45+00:00

As far as I can tell the buffer_count was never used by an userspace application. The number of BOs in the system is far better suited in debugfs than sysfs and we now should be able to add other information here as well. v2: add that additionally to sysfs Signed-off-by: Christian König Acked-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/414954/

drm/ttm/drivers: remove unecessary ttm_module.h include v2

2020-12-01T16:43:46+00:00

ttm_module.h deals with internals of TTM and should never be include outside of it. v2: also move the file around Signed-off-by: Christian König Acked-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/404885/