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Dmitry Osipenko 96a5aee274 drm/msm/gem: Prevent blocking within shrinker loop 
[ Upstream commit 9630b585b6 ]

Consider this scenario:

1. APP1 continuously creates lots of small GEMs
2. APP2 triggers `drop_caches`
3. Shrinker starts to evict APP1 GEMs, while APP1 produces new purgeable
   GEMs
4. msm_gem_shrinker_scan() returns non-zero number of freed pages
   and causes shrinker to try shrink more
5. msm_gem_shrinker_scan() returns non-zero number of freed pages again,
   goto 4
6. The APP2 is blocked in `drop_caches` until APP1 stops producing
   purgeable GEMs

To prevent this blocking scenario, check number of remaining pages
that GPU shrinker couldn't release due to a GEM locking contention
or shrinking rejection. If there are no remaining pages left to shrink,
then there is no need to free up more pages and shrinker may break out
from the loop.

This problem was found during shrinker/madvise IOCTL testing of
virtio-gpu driver. The MSM driver is affected in the same way.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: b352ba54a8 ("drm/msm/gem: Convert to using drm_gem_lru")
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://lore.kernel.org/all/20230108210445.3948344-2-dmitry.osipenko@collabora.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-03-22 13:33:39 +01:00
..
bridge drm: bridge: dw_hdmi: Audio: Add General Parallel Audio (GPA) driver 2022-04-19 18:23:48 +02:00
display drm/display/dp_mst: Add drm_atomic_get_old_mst_topology_state() 2023-03-11 13:55:42 +01:00
i2c
…
ttm drm/ttm: fix undefined behavior in bit shift for TTM_TT_FLAG_PRIV_POPULATED 2022-12-31 13:32:06 +01:00
amd_asic_type.h drm/amdgpu: add new asic_type for IP discovery 2021-10-04 15:23:01 -04:00
drm_aperture.h drm/aperture: Pass DRM driver structure instead of driver name 2021-07-01 11:11:55 +02:00
drm_atomic.h drm/atomic: fix warning of unused variable 2022-06-09 16:09:46 +02:00
drm_atomic_helper.h drm: drm_atomic_helper: Add a new helper to deal with the writeback connector validation 2022-09-05 20:12:16 -01:00
drm_atomic_state_helper.h
…
drm_atomic_uapi.h drm: handle kernel fences in drm_gem_plane_helper_prepare_fb v2 2022-05-02 09:01:51 +02:00
drm_audio_component.h
…
drm_auth.h drm: clarify usage of drm leases 2021-07-29 09:12:01 +02:00
drm_blend.h
…
drm_bridge.h drm/vc4: Add explicit declaration of 'drmm_of_get_bridge' 2022-07-21 12:15:56 +02:00
drm_bridge_connector.h
…
drm_buddy.h drm/selftests: add drm buddy alloc range testcase 2022-02-23 10:44:43 +01:00
drm_cache.h LoongArch: Add writecombine support for drm 2022-06-03 20:09:27 +08:00
drm_client.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_color_mgmt.h
…
drm_connector.h drm/edid: add a quirk for two LG monitors to get them to work on 10bpc 2022-12-31 13:32:59 +01:00
drm_crtc.h drm/crtc: Introduce drmm_crtc_init_with_planes 2022-07-13 10:46:05 +02:00
drm_crtc_helper.h
…
drm_damage_helper.h drm/plane: Move drm_plane_enable_fb_damage_clips into core 2021-07-27 12:21:22 +02:00
drm_debugfs.h
…
drm_debugfs_crc.h
…
drm_device.h drm: Declare hashtable as legacy 2021-11-30 09:41:28 +01:00
drm_displayid.h drm/displayid: convert to drm_edid 2022-05-13 18:55:13 +03:00
drm_drv.h drm: Return error codes from struct drm_driver.gem_create_object 2021-12-02 11:12:39 +01:00
drm_edid.h drm/edid: Handle EDID 1.4 range descriptor h/vfreq offsets 2022-09-02 16:38:51 +03:00
drm_encoder.h drm/encoder: Introduce drmm_encoder_init 2022-07-13 10:46:05 +02:00
drm_encoder_slave.h drm: Remove linux/i2c.h from drm_crtc.h 2022-07-05 21:15:23 +03:00
drm_fb_dma_helper.h drm/gem: rename GEM CMA helpers to GEM DMA helpers 2022-08-03 18:31:49 +02:00
drm_fb_helper.h drm: Remove linux/fb.h from drm_crtc.h 2022-07-05 21:14:02 +03:00
drm_file.h drm: Remove the drm_get_unmapped_area() helper 2022-08-04 11:39:27 -04:00
drm_fixed.h
…
drm_flip_work.h
…
drm_format_helper.h drm/format-helper: Add drm_fb_build_fourcc_list() helper 2022-09-12 09:15:49 +02:00
drm_fourcc.h drm/fourcc: Add drm_format_info.is_color_indexed flag 2022-07-09 15:00:08 +02:00
drm_framebuffer.h drm/fb: Improve drm_framebuffer.offsets documentation 2022-07-09 15:58:52 +02:00
drm_gem.h drm/msm/gem: Prevent blocking within shrinker loop 2023-03-22 13:33:39 +01:00
drm_gem_atomic_helper.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_gem_dma_helper.h drm/gem: rename struct drm_gem_dma_object.{paddr => dma_addr} 2022-08-03 18:32:27 +02:00
drm_gem_framebuffer_helper.h drm/gem: Ignore color planes that are unused by framebuffer format 2022-05-19 19:25:02 +02:00
drm_gem_shmem_helper.h drm: correct comments 2022-07-21 12:16:10 +02:00
drm_gem_ttm_helper.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_gem_vram_helper.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_ioctl.h drm: unexport drm_ioctl_permit 2021-08-13 17:50:48 +02:00
drm_lease.h
…
drm_legacy.h drm: Declare hashtable as legacy 2021-11-30 09:41:28 +01:00
drm_managed.h drm: Add DRM-managed mutex_init() 2022-05-05 09:04:10 +02:00
drm_mipi_dbi.h drm/probe-helper: Add drm_crtc_helper_mode_valid_fixed() 2022-09-12 09:14:26 +02:00
drm_mipi_dsi.h drm/mipi-dsi: Fix byte order of 16-bit DCS set/get brightness 2023-03-10 09:33:14 +01:00
drm_mm.h drm: Replace kernel.h with the necessary inclusions 2021-12-09 13:46:13 +01:00
drm_mode_config.h drm: remove allow_fb_modifiers 2022-01-31 21:45:24 +01:00
drm_mode_object.h drm/object: Add drm_object_property_get_default_value() function 2022-02-25 17:55:42 +01:00
drm_modes.h drm/modes: Add initializer macro DRM_MODE_INIT() 2022-09-12 09:14:59 +02:00
drm_modeset_helper.h
…
drm_modeset_helper_vtables.h drm/drm_modeset_helper_vtables.h: fix a typo 2022-04-06 15:23:08 +02:00
drm_modeset_lock.h drm/locking: fix drm_modeset_acquire_ctx kernel-doc 2022-01-20 14:41:25 +02:00
drm_module.h drm: Provide platform module-init macro 2022-01-19 18:40:18 +01:00
drm_of.h drm: of: Mark empty drm_of_get_data_lanes_count and drm_of_get_data_lanes_ep static 2022-06-12 16:07:05 +02:00
drm_panel.h drm/panel: drop DSC pps pointer 2022-09-18 09:38:06 -07:00
drm_pciids.h
…
drm_plane.h drm/plane: Allocate planes with drm_universal_plane_alloc() 2022-09-20 09:41:06 +02:00
drm_plane_helper.h drm/plane-helper: Add the missing declaration of drm_atomic_state 2023-01-12 12:02:52 +01:00
drm_prime.h dma-buf-map: Rename to iosys-map 2022-02-07 16:35:35 -08:00
drm_print.h drm/drm_print: correct format problem 2023-03-10 09:33:57 +01:00
drm_privacy_screen_consumer.h drm/privacy-screen: Add notifier support (v2) 2021-10-14 13:12:25 +02:00
drm_privacy_screen_driver.h drm/privacy_screen: Add drvdata in drm_privacy_screen 2022-01-10 12:17:37 +01:00
drm_privacy_screen_machine.h drm/privacy-screen: Add X86 specific arch init code 2021-10-14 13:12:24 +02:00
drm_probe_helper.h drm/probe-helper: Add drm_crtc_helper_mode_valid_fixed() 2022-09-12 09:14:26 +02:00
drm_property.h drm: document drm_property_enum.value for bitfields 2021-07-26 10:08:22 +02:00
drm_rect.h drm/rect: Add DRM_RECT_INIT() macro 2022-06-27 13:45:48 +02:00
drm_self_refresh_helper.h
…
drm_simple_kms_helper.h drm/simple-kms: Support custom CRTC state 2021-08-08 20:14:08 +02:00
drm_syncobj.h
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drm_sysfs.h drm/sysfs: introduce drm_sysfs_connector_hotplug_event 2021-11-02 14:27:06 +01:00
drm_util.h
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drm_utils.h
…
drm_vblank.h
…
drm_vblank_work.h
…
drm_vma_manager.h drm/drm_vma_manager: Add drm_vma_node_allow_once() 2023-02-01 08:34:42 +01:00
drm_writeback.h drm: introduce drm_writeback_connector_init_with_encoder() API 2022-05-02 02:12:59 +03:00
gma_drm.h
…
gpu_scheduler.h Merge drm/drm-fixes into drm-misc-fixes 2022-10-20 09:09:00 +02:00
gud.h drm/gud: Add GUD_PIXEL_FORMAT_RGB888 2021-10-04 12:06:14 +02:00
i915_component.h drm/i915/pxp: Define PXP component interface 2021-10-04 13:09:53 -04:00
i915_drm.h drm/i915: include uapi/drm/i915_drm.h directly where needed 2022-03-17 20:06:04 +02:00
i915_mei_hdcp_interface.h drm/display: Move HDCP helpers into display-helper module 2022-04-25 11:19:36 +02:00
i915_pciids.h drm/i915: Add new ADL-S pci id 2022-08-26 05:46:23 -07:00
i915_pxp_tee_interface.h drm/i915/pxp: Define PXP component interface 2021-10-04 13:09:53 -04:00
intel-gtt.h agp/intel: Rename intel-gtt symbols 2022-06-22 15:52:55 -07:00
intel_lpe_audio.h
…
spsc_queue.h
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task_barrier.h
…