dri-devel May 2013

dri-devel@lists.freedesktop.org

116 participants
705 discussions

Re: [Linaro-mm-sig] RFC: Unified DMA allocation algorithms
by Daniel Vetter 01 May '13

01 May '13

On Wed, Apr 24, 2013 at 11:35 PM, Laura Abbott <lauraa(a)codeaurora.org> wrote: > Hi all, > > I've been looking at a better way to do custom dma allocation algorithms in > a similar style to Ion heaps. Most drivers/clients have come up with a > series of semi-standard ways to get memory (CMA, memblock_reserve, > discontiguous pages etc.) . As these allocation schemes get more and more > complex, there needs to be a since place where all clients (Ion based driver > … [View More]vs. DRM driver vs. ???) can independently take advantage of any > optimizations and call a single API for the backing allocations. > > The dma_map_ops take care of almost everything needed for abstraction > but the question is where should new allocation algorithms be located? > Most of the work has been added to either arm/mm/dma-mapping.c or > dma-contiguous.c . My current thought: > > 1) split out the dma_map_ops currently in dma-mapping.c into separate files > (dma-mapping-common.c, dma-mapping-iommu.c) > 2) Extend dma-contiguous.c to support memblock_reserve memory > 3) Place additional algorithms in either arch/arm/mm or > drivers/base/dma-alloc/ as appropriate to the code. This is the part where > I'm most unsure about the direction. > > I don't have anything written yet but I plan to draft some patches assuming > the proposed approach sounds reasonable and no one else has started on > something similar already. > > Thoughts? Opinions? >From my (oblivious to all the arm madness) pov the big thing is getting dma allocations working for more than one struct device. This way we could get rid of to "where do I need to allocate buffers" duplication between the kernel and userspace (which needs to know that to pick the right ion heap), which is my main gripe with ion ;-) Rob Clark sent out a quick rfc for that a while back: http://lists.linaro.org/pipermail/linaro-mm-sig/2012-July/002250.html But that's by far not good enough for arm, especially now that cma gets tightly bound to individual devices with the dt bindings. Also, no one really followed up on Rob's patches, and personally I don't really care that much since x86 is a bit saner ... But it should be good enough for contiguous allocations, which leaves only really crazy stuff unsolved. So I think when you want to rework the various algorithms for allocating dma mem and consolidate them it should also solve this little multi-dev issue. Adding tons more people/lists who might be interested. Cheers, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch [View Less]

1 0

[PATCH 1/7] drm: add unpin function to prime helpers
by Maarten Lankhorst 01 May '13

01 May '13

Prevents buffers from being pinned forever. Signed-off-by: Maarten Lankhorst <maarten.lankhorst(a)canonical.com> Reviewed-by: Daniel Vetter <daniel.vetter(a)ffwll.ch> --- drivers/gpu/drm/drm_prime.c | 13 +++++++++++-- include/drm/drmP.h | 1 + 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 366910d..85bbc52 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -91,10 +… [View More]

1 6

linux-next: manual merge of the drm-intel tree with the drm tree
by Stephen Rothwell 01 May '13

01 May '13

Hi all, Today's linux-next merge of the drm-intel tree got a conflict in drivers/gpu/drm/i915/i915_reg.h between commit a65851af5938 ("drm/i915: Make data/link N value power of two") from the drm tree and commit 72419203cab9 ("drm/i915: hw state readout support for fdi m/n") from the drm-intel tree. I fixed it up (see below) and can carry the fix as necessary (no action is required). -- Cheers, Stephen Rothwell sfr(a)canb.auug.org.au diff --cc drivers/gpu/drm/i915/… [View More]

2 1

[Bug 64091] piglit glean/readPixSanity testcase fails on ppc64 with Radeon adapter
by bugzilla-daemon＠freedesktop.org 01 May '13

01 May '13

https://bugs.freedesktop.org/show_bug.cgi?id=64091 Michel Dänzer <michel(a)daenzer.net> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|mesa-dev(a)lists.freedesktop. |dri-devel(a)lists.freedesktop |org |.org Component|Mesa core |Drivers/Gallium/r600 --- Comment #8 from Michel Dänzer <michel(a)daenzer.… [View More]

1 0

[PATCH] drm/i915: fix dmabuf vmap support
by Dave Airlie 01 May '13

01 May '13

From: Dave Airlie <airlied(a)redhat.com> Sometimes that extra semicolon can really be hard to spot. Cc: Imre Deak <imre.deak(a)intel.com> Signed-off-by: Dave Airlie <airlied(a)redhat.com> --- drivers/gpu/drm/i915/i915_gem_dmabuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 30485e9..dc53a52 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/… [View More]

1 0

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

dri-devel May 2013