Re: [PATCH 0/4] drm: Generic dumb_map_offset for TTM-based drivers

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Apr 08, 2021 at 01:34:03PM +0200, Thomas Zimmermann wrote:
> Hi
> 
> Am 08.04.21 um 13:16 schrieb Daniel Vetter:
> > On Tue, Apr 06, 2021 at 10:29:38AM +0200, Thomas Zimmermann wrote:
> > > The implementation of drm_driver.dumb_map_offset is the same for several
> > > TTM-based drivers. Provide a common function in GEM-TTM helpers.
> > 
> > Out of curiosity, why does this not fit for radeon/amdgpu?
> 
> These drivers perform additional permission checks in their implementations.
> 
> But those checks are also part of the actual mmap code. I want to propose a
> patch to use the generic drm_gem_ttm_map_offset in amdgpu/radeon, and then
> rely on mmap to fail if necessary. It might result in a longer discussion,
> so that's for another patchset.

Ah cool, makes sense.
-Daniel

> 
> Best regards
> Thomas
> 
> > -Daniel
> > 
> > > 
> > > Thomas Zimmermann (4):
> > >    drm/gem-ttm-helper: Provide helper for struct
> > >      drm_driver.dumb_map_offset
> > >    drm/vram-helper: Use drm_gem_ttm_dumb_map_offset()
> > >    drm/nouveau: Use drm_gem_ttm_dumb_map_offset()
> > >    drm/qxl: Use drm_gem_ttm_dumb_map_offset()
> > > 
> > >   drivers/gpu/drm/drm_gem_ttm_helper.c      | 33 ++++++++++++++++
> > >   drivers/gpu/drm/drm_gem_vram_helper.c     | 48 -----------------------
> > >   drivers/gpu/drm/nouveau/nouveau_display.c | 18 ---------
> > >   drivers/gpu/drm/nouveau/nouveau_display.h |  2 -
> > >   drivers/gpu/drm/nouveau/nouveau_drm.c     |  3 +-
> > >   drivers/gpu/drm/qxl/qxl_drv.c             |  3 +-
> > >   drivers/gpu/drm/qxl/qxl_drv.h             |  3 --
> > >   drivers/gpu/drm/qxl/qxl_dumb.c            | 17 --------
> > >   drivers/gpu/drm/qxl/qxl_ioctl.c           |  4 +-
> > >   drivers/gpu/drm/qxl/qxl_object.h          |  5 ---
> > >   include/drm/drm_gem_ttm_helper.h          |  5 ++-
> > >   include/drm/drm_gem_vram_helper.h         |  7 +---
> > >   12 files changed, 45 insertions(+), 103 deletions(-)
> > > 
> > > --
> > > 2.30.2
> > > 
> > 
> 
> -- 
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Geschäftsführer: Felix Imendörffer
> 




-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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