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Message-ID: <55db-64ecb100-57-403f1500@96946290>
Date: Mon, 28 Aug 2023 15:37:12 +0100
From: "Helen Mae Koike Fornazier" <helen.koike@...labora.com>
To: "Dmitry Osipenko" <dmitry.osipenko@...labora.com>
Cc: "David Airlie" <airlied@...il.com>,
"Gerd Hoffmann" <kraxel@...hat.com>,
"Gurchetan Singh" <gurchetansingh@...omium.org>,
"Chia-I Wu" <olvaffe@...il.com>, "Daniel Vetter" <daniel@...ll.ch>,
"Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
"Maxime Ripard" <mripard@...nel.org>,
"Thomas Zimmermann" <tzimmermann@...e.de>,
Christian König <christian.koenig@....com>,
"Qiang Yu" <yuq825@...il.com>,
"Steven Price" <steven.price@....com>,
"Boris Brezillon" <boris.brezillon@...labora.com>,
"Emma Anholt" <emma@...olt.net>, "Melissa Wen" <mwen@...lia.com>,
"Will Deacon" <will@...nel.org>,
"Peter Zijlstra" <peterz@...radead.org>,
"Boqun Feng" <boqun.feng@...il.com>,
"Mark Rutland" <mark.rutland@....com>,
intel-gfx@...ts.freedesktop.org, kernel@...labora.com,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v15 00/23] Add generic memory shrinker to
VirtIO-GPU and Panfrost DRM drivers
On Sunday, August 27, 2023 14:54 -03, Dmitry Osipenko <dmitry.osipenko@...labora.com> wrote:
> This series:
>
> 1. Adds common drm-shmem memory shrinker
> 2. Enables shrinker for VirtIO-GPU driver
> 3. Switches Panfrost driver to the common shrinker
Hi Dmitry,
Would you mind testing with drm-ci? We virt-io tests there and it would be
really great to get your feedback of it.
https://cgit.freedesktop.org/drm/drm/log/?h=topic/drm-ci
You need to merge your changes with the above tree.
To configure it, you just need to have a tree on gitlab.freedesktop.org,
go to the settings and change the CI/CD configuration file from .gitlab-ci.yml
to drivers/gpu/drm/ci/gitlab-ci.yml, and you can start a pipeline
on your branch.
at the time of this writting, gitlab.freedesktop.org is under maintenance,
but it should be back soon.
Thank you!
Helen
>
> Changelog:
>
> v15:- Moved drm-shmem reference counters to use kref that allows to
> optimize unlocked functions, like was suggested by Boris Brezillon.
>
> - Changed drm/gem/shmem function names to use _locked postfix and
> dropped the _unlocked, making the naming scheme consistent across
> DRM code, like was suggested by Boris Brezillon.
>
> - Added patch that fixes UAF in drm-shmem for drivers that import
> dma-buf and then release buffer in the import error code path.
>
> - Added patch that makes drm-shmem use new flag for SGT's get_pages()
> refcounting, preventing unbalanced refcounting when GEM is freed.
>
> - Fixed guest blob pinning in virtio-gpu driver that was missed
> previously in the shrinker patch.
>
> - Moved VC4 and virtio-gpu drivers to use drm_gem_put() in
> GEM-creation error code paths, which is now required by drm-shmem
> and was missed in a previous patch versions.
>
> - Virtio-GPU now attaches shmem pages to host on first use and not
> when BO is created. In older patch versions there was a potential
> race condition in the BO creation code path where both
> get_sgt()+object_attach() should've been made under same resv lock,
> otherwise pages could be evicted before attachment is invoked.
>
> - Virtio-GPU and drm-shmem shrinker patches are split into smaller
> ones.
>
> v14:- All the prerequisite reservation locking patches landed upstream,
> previously were a part of this series in v13 and older.
>
> https://lore.kernel.org/dri-devel/20230529223935.2672495-1-dmitry.osipenko@collabora.com/
>
> - Added patches to improve locked/unlocked function names, like was
> suggested by Boris Brezillon for v13.
>
> - Made all exported drm-shmem symbols GPL, like was previously
> discussed with Thomas Zimmermann on this series.
>
> - Improved virtio-gpu shrinker patch. Now it won't detach purged BO
> when userspace closes GEM. Crosvm (and not qemu) checks res_id on
> CMD_CTX_DETACH_RESOURCE and prints noisy error message if ID is
> invalid, which wasn't noticed before.
>
> v13:- Updated virtio-gpu shrinker patch to use drm_gem_shmem_object_pin()
> directly instead of drm_gem_pin() and dropped patch that exported
> drm_gem_pin() functions, like was requested by Thomas Zimmermann in
> v12.
>
> v12:- Fixed the "no previous prototype for function" warning reported by
> kernel build bot for v11.
>
> - Fixed the missing reservation lock reported by Intel CI for VGEM
> driver. Other drivers using drm-shmem were affected similarly to
> VGEM. The problem was in the dma-buf attachment code path that led
> to drm-shmem pinning function which assumed the held reservation lock
> by drm_gem_pin(). In the past that code path was causing trouble for
> i915 driver and we've changed the locking scheme for the attachment
> code path in the dma-buf core to let exporters to handle the locking
> themselves. After a closer investigation, I realized that my assumption
> about testing of dma-buf export code path using Panfrost driver was
> incorrect. Now I created additional local test to exrecise the Panfrost
> export path. I also reproduced the issue reported by the Intel CI for
> v10. It's all fixed now by making the drm_gem_shmem_pin() to take the
> resv lock by itself.
>
> - Patches are based on top of drm-tip, CC'd intel-gfx CI for testing.
>
> v11:- Rebased on a recent linux-next. Added new patch as a result:
>
> drm/shmem-helper: Export drm_gem_shmem_get_pages_sgt_locked()
>
> It's needed by the virtio-gpu driver to swap-in/unevict shmem
> object, previously get_pages_sgt() didn't use locking.
>
> - Separated the "Add memory shrinker" patch into smaller parts to ease
> the reviewing, as was requested by Thomas Zimmermann:
>
> drm/shmem-helper: Factor out pages alloc/release from
> drm_gem_shmem_get/put_pages()
> drm/shmem-helper: Add pages_pin_count field
> drm/shmem-helper: Switch drm_gem_shmem_vmap/vunmap to use pin/unpin
> drm/shmem-helper: Factor out unpinning part from drm_gem_shmem_purge()
>
> - Addessed the v10 review comments from Thomas Zimmermann: return errno
> instead of bool, sort code alphabetically, rename function and etc
> minor changes.
>
> - Added new patch to remove the "map->is_iomem" from drm-shmem, as
> was suggested by Thomas Zimmermann.
>
> - Added acks and r-b's that were given to v10.
>
> v10:- Was partially applied to misc-fixes/next.
>
> https://lore.kernel.org/dri-devel/6c16f303-81df-7ebe-85e9-51bb40a8b301@collabora.com/T/
>
> Dmitry Osipenko (23):
> drm/shmem-helper: Fix UAF in error path when freeing SGT of imported
> GEM
> drm/shmem-helper: Use flag for tracking page count bumped by
> get_pages_sgt()
> drm/gem: Change locked/unlocked postfix of drm_gem_v/unmap() function
> names
> drm/gem: Add _locked postfix to functions that have unlocked
> counterpart
> drm/v3d: Replace open-coded drm_gem_shmem_free() with
> drm_gem_object_put()
> drm/virtio: Replace drm_gem_shmem_free() with drm_gem_object_put()
> drm/shmem-helper: Make all exported symbols GPL
> drm/shmem-helper: Refactor locked/unlocked functions
> drm/shmem-helper: Remove obsoleted is_iomem test
> locking/refcount, kref: Add kref_put_ww_mutex()
> dma-resv: Add kref_put_dma_resv()
> drm/shmem-helper: Add and use pages_pin_count
> drm/shmem-helper: Use kref for pages_use_count
> drm/shmem-helper: Add and use lockless drm_gem_shmem_get_pages()
> drm/shmem-helper: Switch drm_gem_shmem_vmap/vunmap to use pin/unpin
> drm/shmem-helper: Use kref for vmap_use_count
> drm/shmem-helper: Add and use drm_gem_shmem_resv_assert_held() helper
> drm/shmem-helper: Add memory shrinker
> drm/shmem-helper: Export drm_gem_shmem_get_pages_sgt_locked()
> drm/virtio: Pin display framebuffer BO
> drm/virtio: Attach shmem BOs dynamically
> drm/virtio: Support memory shrinking
> drm/panfrost: Switch to generic memory shrinker
>
> drivers/gpu/drm/drm_client.c | 6 +-
> drivers/gpu/drm/drm_gem.c | 26 +-
> drivers/gpu/drm/drm_gem_framebuffer_helper.c | 6 +-
> drivers/gpu/drm/drm_gem_shmem_helper.c | 616 +++++++++++++++---
> drivers/gpu/drm/drm_internal.h | 4 +-
> drivers/gpu/drm/drm_prime.c | 4 +-
> drivers/gpu/drm/lima/lima_gem.c | 11 +-
> drivers/gpu/drm/lima/lima_sched.c | 4 +-
> drivers/gpu/drm/panfrost/Makefile | 1 -
> drivers/gpu/drm/panfrost/panfrost_device.h | 4 -
> drivers/gpu/drm/panfrost/panfrost_drv.c | 29 +-
> drivers/gpu/drm/panfrost/panfrost_dump.c | 4 +-
> drivers/gpu/drm/panfrost/panfrost_gem.c | 36 +-
> drivers/gpu/drm/panfrost/panfrost_gem.h | 9 -
> .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 122 ----
> drivers/gpu/drm/panfrost/panfrost_job.c | 18 +-
> drivers/gpu/drm/panfrost/panfrost_mmu.c | 4 +-
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 6 +-
> drivers/gpu/drm/v3d/v3d_bo.c | 26 +-
> drivers/gpu/drm/virtio/virtgpu_drv.h | 22 +-
> drivers/gpu/drm/virtio/virtgpu_gem.c | 80 +++
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 57 +-
> drivers/gpu/drm/virtio/virtgpu_kms.c | 8 +
> drivers/gpu/drm/virtio/virtgpu_object.c | 147 ++++-
> drivers/gpu/drm/virtio/virtgpu_plane.c | 17 +-
> drivers/gpu/drm/virtio/virtgpu_submit.c | 15 +-
> drivers/gpu/drm/virtio/virtgpu_vq.c | 40 ++
> include/drm/drm_device.h | 10 +-
> include/drm/drm_gem.h | 6 +-
> include/drm/drm_gem_shmem_helper.h | 141 +++-
> include/linux/dma-resv.h | 9 +
> include/linux/kref.h | 12 +
> include/linux/refcount.h | 5 +
> include/uapi/drm/virtgpu_drm.h | 14 +
> lib/refcount.c | 34 +
> 35 files changed, 1167 insertions(+), 386 deletions(-)
> delete mode 100644 drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
>
> --
> 2.41.0
>
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