linux-dev/drivers/gpu/drm/vmwgfx/ttm_object.c, branch linus/master

drm/vmwgfx: Implement DRIVER_GEM

2021-12-09T18:16:16Z

This is initial change adding support for DRIVER_GEM to vmwgfx. vmwgfx was written before GEM and has always used TTM. Over the years the TTM buffers started inherting from GEM objects but vmwgfx never implemented GEM making it quite awkward. We were directly setting variables in GEM objects to not make DRM crash. This change brings vmwgfx inline with other DRM drivers and allows us to use a lot of DRM helpers which have depended on drivers with GEM support. Due to historical reasons vmwgfx splits the idea of a buffer and surface which makes it a littly tricky since either one can be used in most of our ioctl's which take user space handles. For now our BO's are GEM objects and our surfaces are opaque objects which are backed by GEM objects. In the future I'd like to combine those into a single BO but we don't want to break any of our existing ioctl's so it will take time to do it in a non-destructive way. Signed-off-by: Zack Rusin Reviewed-by: Martin Krastev Link: https://patchwork.freedesktop.org/patch/msgid/20211206172620.3139754-5-zack@kde.org

drm/vmwgfx: Remove the dedicated memory accounting

2021-12-09T18:16:10Z

vmwgfx shared very elaborate memory accounting with ttm. It was moved from ttm to vmwgfx in change f07069da6b4c ("drm/ttm: move memory accounting into vmwgfx v4") but because of complexity it was hard to maintain. Some parts of the code weren't freeing memory correctly and some were missing accounting all together. While those would be fairly easy to fix the fundamental reason for memory accounting in the driver was the ability to invoke shrinker which is part of TTM code as well (with support for unified memory hopefully coming soon). That meant that vmwgfx had a lot of code that was either unused or duplicating code from TTM. Removing this code also prevents excessive calls to global swapout which were common during memory pressure because both vmwgfx and TTM would invoke the shrinker when memory usage reached half of RAM. Fixes: f07069da6b4c ("drm/ttm: move memory accounting into vmwgfx v4") Signed-off-by: Zack Rusin Reviewed-by: Martin Krastev Link: https://patchwork.freedesktop.org/patch/msgid/20211206172620.3139754-2-zack@kde.org

drm/vmwgfx: Copy DRM hash-table code into driver

2021-11-30T08:41:25Z

Besides some legacy code, vmwgfx is the only user of DRM's hash- table implementation. Copy the code into the driver, so that the core code can be retired. No functional changes. However, the real solution for vmwgfx is to use Linux' generic hash-table functions. v2: * add TODO item for updating vmwgfx (Sam) Signed-off-by: Thomas Zimmermann Acked-by: Daniel Vetter Acked-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20211129094841.22499-3-tzimmermann@suse.de

dma-buf: move dma-buf symbols into the DMA_BUF module namespace

2021-10-25T12:53:08Z

In order to better track where in the kernel the dma-buf code is used, put the symbols in the namespace DMA_BUF and modify all users of the symbols to properly import the namespace to not break the build at the same time. Now the output of modinfo shows the use of these symbols, making it easier to watch for users over time: $ modinfo drivers/misc/fastrpc.ko | grep import import_ns: DMA_BUF Cc: "Pan, Xinhui" Cc: David Airlie Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: Mauro Carvalho Chehab Cc: dri-devel@lists.freedesktop.org Acked-by: Daniel Vetter Acked-by: Christian König Acked-by: Arnd Bergmann Acked-by: Sumit Semwal Acked-by: Alex Deucher Link: https://lore.kernel.org/r/20211010124628.17691-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

drm/vmwgfx: replace idr_init() by idr_init_base()

2021-04-29T18:54:54Z

idr_init() uses base 0 which is an invalid identifier for this driver. The idr_alloc for this driver uses 1 as start value for ID range. The new function idr_init_base allows IDR to set the ID lookup from base 1. This avoids all lookups that otherwise starts from 0 since 0 is always unused / available. References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient") Signed-off-by: Deepak R Varma Signed-off-by: Zack Rusin Link: https://patchwork.freedesktop.org/patch/msgid/20201105190718.GA89863@localhost

drm/vmwgfx/ttm_object: Reorder header to immediately precede its struct

2021-01-19T19:19:12Z

Also add missing description for 'refcount' Fixes the following W=1 kernel build warning(s): drivers/gpu/drm/vmwgfx/ttm_object.c:60: error: Cannot parse struct or union! Cc: VMware Graphics Cc: Roland Scheidegger Cc: Zack Rusin Cc: David Airlie Cc: Daniel Vetter Cc: Sumit Semwal Cc: "Christian König" Cc: Dave Airlie Cc: Rob Clark Cc: dri-devel@lists.freedesktop.org Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Signed-off-by: Lee Jones Signed-off-by: Zack Rusin Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-30-lee.jones@linaro.org

drm/vmwgfx/ttm_object: Demote half-assed headers and fix-up another

2021-01-19T19:19:11Z

Fixes the following W=1 kernel build warning(s): drivers/gpu/drm/vmwgfx/ttm_object.c:60: error: Cannot parse struct or union! drivers/gpu/drm/vmwgfx/ttm_object.c:97: warning: Function parameter or member 'mem_glob' not described in 'ttm_object_device' drivers/gpu/drm/vmwgfx/ttm_object.c:97: warning: Function parameter or member 'ops' not described in 'ttm_object_device' drivers/gpu/drm/vmwgfx/ttm_object.c:97: warning: Function parameter or member 'dmabuf_release' not described in 'ttm_object_device' drivers/gpu/drm/vmwgfx/ttm_object.c:97: warning: Function parameter or member 'dma_buf_size' not described in 'ttm_object_device' drivers/gpu/drm/vmwgfx/ttm_object.c:97: warning: Function parameter or member 'idr' not described in 'ttm_object_device' drivers/gpu/drm/vmwgfx/ttm_object.c:128: warning: Function parameter or member 'rcu_head' not described in 'ttm_ref_object' drivers/gpu/drm/vmwgfx/ttm_object.c:128: warning: Function parameter or member 'tfile' not described in 'ttm_ref_object' drivers/gpu/drm/vmwgfx/ttm_object.c:582: warning: Function parameter or member 'dmabuf' not described in 'get_dma_buf_unless_doomed' drivers/gpu/drm/vmwgfx/ttm_object.c:582: warning: Excess function parameter 'dma_buf' description in 'get_dma_buf_unless_doomed' Cc: VMware Graphics Cc: Roland Scheidegger Cc: Zack Rusin Cc: David Airlie Cc: Daniel Vetter Cc: Sumit Semwal Cc: "Christian König" Cc: Dave Airlie Cc: Rob Clark Cc: dri-devel@lists.freedesktop.org Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Signed-off-by: Lee Jones Signed-off-by: Zack Rusin Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-10-lee.jones@linaro.org

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

2020-12-01T16:43:46Z

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/

drm/vmwgfx: Fix user space handle equal to zero

2019-05-21T08:23:09Z

User-space handles equal to zero are interpreted as uninitialized or illegal by some drm systems (most notably kms). This means that a dumb buffer or surface with a zero user-space handle can never be used as a kms frame-buffer. Cc: Fixes: c7eae62666ad ("drm/vmwgfx: Make the object handles idr-generated") Signed-off-by: Thomas Hellstrom Reviewed-by: Deepak Rawat

drm/vmwgfx: Look up objects without taking a reference

2018-09-27T14:14:48Z

Typically when we look up objects under the rcu lock, we take a reference to make sure the returned object pointer is valid. Now provide a function to look up an object and instead of taking a reference to it, keep the rcu lock held when returning the object pointer. This means that the object pointer is valid as long as the rcu lock is held, but the object may be doomed (its refcount may be zero). Any persistent usage of the object pointer outside of the rcu lock requires a reference to be taken using kref_get_unless_zero(). Signed-off-by: Thomas Hellstrom Reviewed-by: Sinclair Yeh