From: Thomas Zimmermann <tzimmermann@suse.de>
To: daniel@ffwll.ch, airlied@linux.ie,
maarten.lankhorst@linux.intel.com, mripard@kernel.org,
kraxel@redhat.com, hdegoede@redhat.com, sean@poorly.run,
sam@ravnborg.org, noralf@tronnes.org
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
dri-devel@lists.freedesktop.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH 0/6 RFC] drm: Move vmap out of commit tail for SHMEM drivers
Date: Wed, 3 Feb 2021 14:10:40 +0100 [thread overview]
Message-ID: <20210203131046.22371-1-tzimmermann@suse.de> (raw)
Several SHMEM-based drivers use the BO as shadow buffer for the real
framebuffer memory. Damage handling requires a vmap of the BO memory.
Vmap/vunmap can acquire the dma-buf reservation lock, which is not
allowed in commit tails.
This patchset introduces a set of helpers that implement vmap/vunmap
in the plane's prepare_fb and cleanup_fb; and provide the mapping's
address to commit-tail functions. Wrapper sfor simple KMS are provides,
as all of the involved drivers are built upon simple-KMS helpers.
Patch 1 adds the support for private plane state to the simple-KMS
helper library.
Patch 2 provides plane state for SHMEM-based shadow planes. It's a
DRM plane with BO mappings into kernel address space. The involved
helpers take care of the details.
Patches 3 to 6 convert each involved driver to the new shadow-plane
helpers. The vmap operations are being removed from commit-tail
functions. An additional benefit is that vmap errors are now detected
before the commit starts. The original commit-tail functions could not
handle failed vmap operations.
I smoke-tested the code by running fbdev, Xorg and weston with the
converted mgag200 driver.
Thomas Zimmermann (6):
drm/simple-kms: Add plane-state helpers
drm/shmem-helper: Add additional KMS helpers
drm/mgag200: Move vmap out of commit tail
drm/cirrus: Move vmap out of commit tail
drm/gm12u320: Move vmap out of commit tail
drm/udl: Move vmap out of commit tail
drivers/gpu/drm/Kconfig | 7 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_gem_shmem_kms_helper.c | 159 +++++++++++++++++++++
drivers/gpu/drm/drm_simple_kms_helper.c | 40 +++++-
drivers/gpu/drm/mgag200/Kconfig | 1 +
drivers/gpu/drm/mgag200/mgag200_mode.c | 25 ++--
drivers/gpu/drm/tiny/Kconfig | 6 +-
drivers/gpu/drm/tiny/cirrus.c | 45 +++---
drivers/gpu/drm/tiny/gm12u320.c | 30 ++--
drivers/gpu/drm/udl/Kconfig | 1 +
drivers/gpu/drm/udl/udl_modeset.c | 36 ++---
include/drm/drm_gem_shmem_kms_helper.h | 56 ++++++++
include/drm/drm_simple_kms_helper.h | 28 ++++
13 files changed, 353 insertions(+), 82 deletions(-)
create mode 100644 drivers/gpu/drm/drm_gem_shmem_kms_helper.c
create mode 100644 include/drm/drm_gem_shmem_kms_helper.h
base-commit: 1e37c3960fd3910f3f65cd6927a6ebab8e8efc26
--
2.30.0
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next reply other threads:[~2021-02-03 13:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-03 13:10 Thomas Zimmermann [this message]
2021-02-03 13:10 ` [PATCH 1/6] drm/simple-kms: Add plane-state helpers Thomas Zimmermann
2021-02-03 13:10 ` [PATCH 2/6] drm/shmem-helper: Add additional KMS helpers Thomas Zimmermann
2021-02-03 14:01 ` Daniel Vetter
2021-02-03 14:26 ` Thomas Zimmermann
2021-02-03 14:57 ` Daniel Vetter
2021-02-03 13:10 ` [PATCH 3/6] drm/mgag200: Move vmap out of commit tail Thomas Zimmermann
2021-02-03 13:10 ` [PATCH 4/6] drm/cirrus: " Thomas Zimmermann
2021-02-03 13:10 ` [PATCH 5/6] drm/gm12u320: " Thomas Zimmermann
2021-02-03 13:10 ` [PATCH 6/6] drm/udl: " Thomas Zimmermann
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