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![Dave Airlie](/assets/img/avatar_default.png)
UAPI Changes: - drm/vc4: Expose performance counters to userspace (Boris) Cross-subsystem Changes: - MAINTAINERS: Linus to maintain panel-arm-versatile in -misc (Linus) Core Changes: - Only use swiotlb when necessary (Chunming) Driver Changes: - drm/panel: Add support for ARM Versatile panels (Linus) - pl111: Improvements around versatile panel support (Linus) ---------------------------------------- Tagged on 2018-02-06: drm-misc-next for 4.17: UAPI Changes: - Validate mode flags + type (Ville) - Deprecate unused mode flags PIXMUX, BCAST (Ville) - Deprecate unused mode types BUILTIN, CRTC_C, CLOCK_C, DEFAULT (Ville) Cross-subsystem Changes: - MAINTAINERS: s/Daniel/Maarten/ for drm-misc (Daniel) Core Changes: - gem: Export gem functions for drivers to use (Samuel) - bridge: Introduce bridge timings in drm_bridge (Linus) - dma-buf: Allow exclusive fence to be bundled in fence array when calling reservation_object_get_fences_rcu (Christian) - dp: Add training pattern 4 and HBR3 support to dp helpers (Manasi) - fourcc: Add alpha bit to formats to avoid driver format LUTs (Maxime) - mode: Various cleanups + add new device-wide .mode_valid hook (Ville) - atomic: Fix state leak when non-blocking commits fail (Leo) NOTE: IIRC, this was cross-picked to -fixes so it might fall out - crc: Allow polling on the data fd (Maarten) Driver Changes: - bridge/vga-dac: Add THS8134* support (Linus) - tinydrm: Various MIPI DBI improvements/cleanups (Noralf) - bridge/dw-mipi-dsi: Cleanups + use create_packet helper (Brian) - drm/sun4i: Add Display Engine frontend support (Maxime) - drm/sun4i: Add zpos support + increase num planes from 2 to 4 (Maxime) - various: Use drm_mode_get_hv_timing() to fill plane clip rectangle (Ville) - stm: Add 8-bit clut support, add dsi phy v1.31 support, +fixes (Phillipe) Cc: Boris Brezillon <boris.brezillon@free-electrons.com> Cc: Chunming Zhou <david1.zhou@amd.com> Cc: Samuel Li <Samuel.Li@amd.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Noralf Trønnes <noralf@tronnes.org> Cc: Brian Norris <briannorris@chromium.org> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Christian König <christian.koenig@amd.com> Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Philippe Cornu <philippe.cornu@st.com> Cc: Leo (Sunpeng) Li <sunpeng.li@amd.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEfxcpfMSgdnQMs+QqlvcN/ahKBwoFAlqDUjcACgkQlvcN/ahK Bwp83Af8D805yWeS/rJ9pLaiaWmfuymMtZVl/IOEssElxFO4d+ya/S4HrcWJQwX6 KinIQiaytKKe3+TXhVRVVwg7nLBFXzaPey6SvFPCgSEa+Bm+b3v0Uk1ll59UfOzs /IhwIYIvUSCqTVAccpoT8X/85JUQ3iP41RbdfbBwUtpvL+XLl/y29Pw1dtV71ZCH I3/5zAk3odLd9LuPkyhtg+V1e8pluKlPVGZ0ElOiZ7HlKzc3ekOLNNj563LBHq8y b2txi2+h/bfBx7PU5JfP6aOKGGameE79/3UExwW0dJJAHqU728KKs/7OaDu7w0vr UlH0cY/Zc461ejPldXXx8hoKIxJ3bw== =5EUv -----END PGP SIGNATURE----- Merge tag 'drm-misc-next-2018-02-13' of git://anongit.freedesktop.org/drm/drm-misc into drm-next drm-misc-next for 4.17: UAPI Changes: - drm/vc4: Expose performance counters to userspace (Boris) Cross-subsystem Changes: - MAINTAINERS: Linus to maintain panel-arm-versatile in -misc (Linus) Core Changes: - Only use swiotlb when necessary (Chunming) Driver Changes: - drm/panel: Add support for ARM Versatile panels (Linus) - pl111: Improvements around versatile panel support (Linus) ---------------------------------------- Tagged on 2018-02-06: drm-misc-next for 4.17: UAPI Changes: - Validate mode flags + type (Ville) - Deprecate unused mode flags PIXMUX, BCAST (Ville) - Deprecate unused mode types BUILTIN, CRTC_C, CLOCK_C, DEFAULT (Ville) Cross-subsystem Changes: - MAINTAINERS: s/Daniel/Maarten/ for drm-misc (Daniel) Core Changes: - gem: Export gem functions for drivers to use (Samuel) - bridge: Introduce bridge timings in drm_bridge (Linus) - dma-buf: Allow exclusive fence to be bundled in fence array when calling reservation_object_get_fences_rcu (Christian) - dp: Add training pattern 4 and HBR3 support to dp helpers (Manasi) - fourcc: Add alpha bit to formats to avoid driver format LUTs (Maxime) - mode: Various cleanups + add new device-wide .mode_valid hook (Ville) - atomic: Fix state leak when non-blocking commits fail (Leo) NOTE: IIRC, this was cross-picked to -fixes so it might fall out - crc: Allow polling on the data fd (Maarten) Driver Changes: - bridge/vga-dac: Add THS8134* support (Linus) - tinydrm: Various MIPI DBI improvements/cleanups (Noralf) - bridge/dw-mipi-dsi: Cleanups + use create_packet helper (Brian) - drm/sun4i: Add Display Engine frontend support (Maxime) - drm/sun4i: Add zpos support + increase num planes from 2 to 4 (Maxime) - various: Use drm_mode_get_hv_timing() to fill plane clip rectangle (Ville) - stm: Add 8-bit clut support, add dsi phy v1.31 support, +fixes (Phillipe) Cc: Boris Brezillon <boris.brezillon@free-electrons.com> Cc: Chunming Zhou <david1.zhou@amd.com> Cc: Samuel Li <Samuel.Li@amd.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Noralf Trønnes <noralf@tronnes.org> Cc: Brian Norris <briannorris@chromium.org> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Christian König <christian.koenig@amd.com> Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Philippe Cornu <philippe.cornu@st.com> Cc: Leo (Sunpeng) Li <sunpeng.li@amd.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> * tag 'drm-misc-next-2018-02-13' of git://anongit.freedesktop.org/drm/drm-misc: (115 commits) drm/radeon: only enable swiotlb path when need v2 drm/amdgpu: only enable swiotlb alloc when need v2 drm: add func to get max iomem address v2 drm/vc4: Expose performance counters to userspace drm: Print the pid when debug logging an ioctl error. drm/stm: ltdc: remove non-alpha color formats on layer 2 for older hw drm/stm: ltdc: add non-alpha color formats drm/bridge/synopsys: dsi: Add 1.31 version support drm/bridge/synopsys: dsi: Add read feature drm/pl111: Support multiple endpoints on the CLCD drm/pl111: Support variants with broken VBLANK drm/pl111: Support variants with broken clock divider drm/pl111: Handle the Versatile RGB/BGR565 mode drm/pl111: Properly detect the ARM PL110 variants drm/panel: Add support for ARM Versatile panels drm/panel: Device tree bindings for ARM Versatile panels drm/bridge: Rename argument from crtc to bridge drm/crc: Add support for polling on the data fd. drm/sun4i: Use drm_mode_get_hv_timing() to populate plane clip rectangle drm/rcar-du: Use drm_mode_get_hv_timing() to populate plane clip rectangle ...
638 lines
16 KiB
C
638 lines
16 KiB
C
/*
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* Copyright (C) 2012-2014 Canonical Ltd (Maarten Lankhorst)
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*
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* Based on bo.c which bears the following copyright notice,
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* but is dual licensed:
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#include <linux/reservation.h>
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#include <linux/export.h>
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/**
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* DOC: Reservation Object Overview
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*
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* The reservation object provides a mechanism to manage shared and
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* exclusive fences associated with a buffer. A reservation object
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* can have attached one exclusive fence (normally associated with
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* write operations) or N shared fences (read operations). The RCU
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* mechanism is used to protect read access to fences from locked
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* write-side updates.
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*/
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DEFINE_WW_CLASS(reservation_ww_class);
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EXPORT_SYMBOL(reservation_ww_class);
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struct lock_class_key reservation_seqcount_class;
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EXPORT_SYMBOL(reservation_seqcount_class);
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const char reservation_seqcount_string[] = "reservation_seqcount";
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EXPORT_SYMBOL(reservation_seqcount_string);
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/**
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* reservation_object_reserve_shared - Reserve space to add a shared
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* fence to a reservation_object.
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* @obj: reservation object
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*
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* Should be called before reservation_object_add_shared_fence(). Must
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* be called with obj->lock held.
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*
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* RETURNS
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* Zero for success, or -errno
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*/
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int reservation_object_reserve_shared(struct reservation_object *obj)
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{
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struct reservation_object_list *fobj, *old;
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u32 max;
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old = reservation_object_get_list(obj);
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if (old && old->shared_max) {
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if (old->shared_count < old->shared_max) {
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/* perform an in-place update */
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kfree(obj->staged);
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obj->staged = NULL;
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return 0;
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} else
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max = old->shared_max * 2;
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} else
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max = 4;
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/*
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* resize obj->staged or allocate if it doesn't exist,
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* noop if already correct size
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*/
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fobj = krealloc(obj->staged, offsetof(typeof(*fobj), shared[max]),
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GFP_KERNEL);
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if (!fobj)
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return -ENOMEM;
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obj->staged = fobj;
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fobj->shared_max = max;
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return 0;
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}
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EXPORT_SYMBOL(reservation_object_reserve_shared);
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static void
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reservation_object_add_shared_inplace(struct reservation_object *obj,
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struct reservation_object_list *fobj,
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struct dma_fence *fence)
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{
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struct dma_fence *signaled = NULL;
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u32 i, signaled_idx;
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dma_fence_get(fence);
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preempt_disable();
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write_seqcount_begin(&obj->seq);
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for (i = 0; i < fobj->shared_count; ++i) {
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struct dma_fence *old_fence;
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old_fence = rcu_dereference_protected(fobj->shared[i],
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reservation_object_held(obj));
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if (old_fence->context == fence->context) {
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/* memory barrier is added by write_seqcount_begin */
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RCU_INIT_POINTER(fobj->shared[i], fence);
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write_seqcount_end(&obj->seq);
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preempt_enable();
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dma_fence_put(old_fence);
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return;
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}
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if (!signaled && dma_fence_is_signaled(old_fence)) {
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signaled = old_fence;
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signaled_idx = i;
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}
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}
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/*
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* memory barrier is added by write_seqcount_begin,
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* fobj->shared_count is protected by this lock too
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*/
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if (signaled) {
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RCU_INIT_POINTER(fobj->shared[signaled_idx], fence);
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} else {
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RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
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fobj->shared_count++;
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}
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write_seqcount_end(&obj->seq);
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preempt_enable();
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dma_fence_put(signaled);
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}
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static void
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reservation_object_add_shared_replace(struct reservation_object *obj,
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struct reservation_object_list *old,
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struct reservation_object_list *fobj,
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struct dma_fence *fence)
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{
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unsigned i, j, k;
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dma_fence_get(fence);
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if (!old) {
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RCU_INIT_POINTER(fobj->shared[0], fence);
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fobj->shared_count = 1;
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goto done;
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}
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/*
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* no need to bump fence refcounts, rcu_read access
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* requires the use of kref_get_unless_zero, and the
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* references from the old struct are carried over to
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* the new.
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*/
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for (i = 0, j = 0, k = fobj->shared_max; i < old->shared_count; ++i) {
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struct dma_fence *check;
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check = rcu_dereference_protected(old->shared[i],
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reservation_object_held(obj));
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if (check->context == fence->context ||
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dma_fence_is_signaled(check))
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RCU_INIT_POINTER(fobj->shared[--k], check);
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else
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RCU_INIT_POINTER(fobj->shared[j++], check);
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}
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fobj->shared_count = j;
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RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
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fobj->shared_count++;
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done:
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preempt_disable();
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write_seqcount_begin(&obj->seq);
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/*
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* RCU_INIT_POINTER can be used here,
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* seqcount provides the necessary barriers
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*/
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RCU_INIT_POINTER(obj->fence, fobj);
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write_seqcount_end(&obj->seq);
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preempt_enable();
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if (!old)
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return;
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/* Drop the references to the signaled fences */
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for (i = k; i < fobj->shared_max; ++i) {
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struct dma_fence *f;
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f = rcu_dereference_protected(fobj->shared[i],
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reservation_object_held(obj));
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dma_fence_put(f);
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}
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kfree_rcu(old, rcu);
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}
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/**
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* reservation_object_add_shared_fence - Add a fence to a shared slot
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* @obj: the reservation object
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* @fence: the shared fence to add
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*
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* Add a fence to a shared slot, obj->lock must be held, and
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* reservation_object_reserve_shared() has been called.
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*/
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void reservation_object_add_shared_fence(struct reservation_object *obj,
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struct dma_fence *fence)
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{
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struct reservation_object_list *old, *fobj = obj->staged;
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old = reservation_object_get_list(obj);
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obj->staged = NULL;
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if (!fobj) {
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BUG_ON(old->shared_count >= old->shared_max);
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reservation_object_add_shared_inplace(obj, old, fence);
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} else
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reservation_object_add_shared_replace(obj, old, fobj, fence);
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}
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EXPORT_SYMBOL(reservation_object_add_shared_fence);
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/**
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* reservation_object_add_excl_fence - Add an exclusive fence.
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* @obj: the reservation object
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* @fence: the shared fence to add
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*
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* Add a fence to the exclusive slot. The obj->lock must be held.
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*/
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void reservation_object_add_excl_fence(struct reservation_object *obj,
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struct dma_fence *fence)
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{
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struct dma_fence *old_fence = reservation_object_get_excl(obj);
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struct reservation_object_list *old;
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u32 i = 0;
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old = reservation_object_get_list(obj);
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if (old)
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i = old->shared_count;
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if (fence)
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dma_fence_get(fence);
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preempt_disable();
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write_seqcount_begin(&obj->seq);
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/* write_seqcount_begin provides the necessary memory barrier */
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RCU_INIT_POINTER(obj->fence_excl, fence);
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if (old)
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old->shared_count = 0;
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write_seqcount_end(&obj->seq);
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preempt_enable();
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/* inplace update, no shared fences */
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while (i--)
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dma_fence_put(rcu_dereference_protected(old->shared[i],
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reservation_object_held(obj)));
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dma_fence_put(old_fence);
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}
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EXPORT_SYMBOL(reservation_object_add_excl_fence);
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/**
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* reservation_object_copy_fences - Copy all fences from src to dst.
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* @dst: the destination reservation object
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* @src: the source reservation object
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*
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* Copy all fences from src to dst. dst-lock must be held.
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*/
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int reservation_object_copy_fences(struct reservation_object *dst,
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struct reservation_object *src)
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{
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struct reservation_object_list *src_list, *dst_list;
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struct dma_fence *old, *new;
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size_t size;
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unsigned i;
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rcu_read_lock();
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src_list = rcu_dereference(src->fence);
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retry:
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if (src_list) {
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unsigned shared_count = src_list->shared_count;
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size = offsetof(typeof(*src_list), shared[shared_count]);
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rcu_read_unlock();
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dst_list = kmalloc(size, GFP_KERNEL);
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if (!dst_list)
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return -ENOMEM;
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rcu_read_lock();
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src_list = rcu_dereference(src->fence);
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if (!src_list || src_list->shared_count > shared_count) {
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kfree(dst_list);
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goto retry;
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}
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dst_list->shared_count = 0;
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dst_list->shared_max = shared_count;
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for (i = 0; i < src_list->shared_count; ++i) {
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struct dma_fence *fence;
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fence = rcu_dereference(src_list->shared[i]);
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
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&fence->flags))
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continue;
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if (!dma_fence_get_rcu(fence)) {
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kfree(dst_list);
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src_list = rcu_dereference(src->fence);
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goto retry;
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}
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if (dma_fence_is_signaled(fence)) {
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dma_fence_put(fence);
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continue;
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}
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rcu_assign_pointer(dst_list->shared[dst_list->shared_count++], fence);
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}
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} else {
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dst_list = NULL;
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}
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new = dma_fence_get_rcu_safe(&src->fence_excl);
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rcu_read_unlock();
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kfree(dst->staged);
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dst->staged = NULL;
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src_list = reservation_object_get_list(dst);
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old = reservation_object_get_excl(dst);
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preempt_disable();
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write_seqcount_begin(&dst->seq);
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/* write_seqcount_begin provides the necessary memory barrier */
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RCU_INIT_POINTER(dst->fence_excl, new);
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RCU_INIT_POINTER(dst->fence, dst_list);
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write_seqcount_end(&dst->seq);
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preempt_enable();
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if (src_list)
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kfree_rcu(src_list, rcu);
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dma_fence_put(old);
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return 0;
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}
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EXPORT_SYMBOL(reservation_object_copy_fences);
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/**
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* reservation_object_get_fences_rcu - Get an object's shared and exclusive
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* fences without update side lock held
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* @obj: the reservation object
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* @pfence_excl: the returned exclusive fence (or NULL)
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* @pshared_count: the number of shared fences returned
|
|
* @pshared: the array of shared fence ptrs returned (array is krealloc'd to
|
|
* the required size, and must be freed by caller)
|
|
*
|
|
* Retrieve all fences from the reservation object. If the pointer for the
|
|
* exclusive fence is not specified the fence is put into the array of the
|
|
* shared fences as well. Returns either zero or -ENOMEM.
|
|
*/
|
|
int reservation_object_get_fences_rcu(struct reservation_object *obj,
|
|
struct dma_fence **pfence_excl,
|
|
unsigned *pshared_count,
|
|
struct dma_fence ***pshared)
|
|
{
|
|
struct dma_fence **shared = NULL;
|
|
struct dma_fence *fence_excl;
|
|
unsigned int shared_count;
|
|
int ret = 1;
|
|
|
|
do {
|
|
struct reservation_object_list *fobj;
|
|
unsigned int i, seq;
|
|
size_t sz = 0;
|
|
|
|
shared_count = i = 0;
|
|
|
|
rcu_read_lock();
|
|
seq = read_seqcount_begin(&obj->seq);
|
|
|
|
fence_excl = rcu_dereference(obj->fence_excl);
|
|
if (fence_excl && !dma_fence_get_rcu(fence_excl))
|
|
goto unlock;
|
|
|
|
fobj = rcu_dereference(obj->fence);
|
|
if (fobj)
|
|
sz += sizeof(*shared) * fobj->shared_max;
|
|
|
|
if (!pfence_excl && fence_excl)
|
|
sz += sizeof(*shared);
|
|
|
|
if (sz) {
|
|
struct dma_fence **nshared;
|
|
|
|
nshared = krealloc(shared, sz,
|
|
GFP_NOWAIT | __GFP_NOWARN);
|
|
if (!nshared) {
|
|
rcu_read_unlock();
|
|
nshared = krealloc(shared, sz, GFP_KERNEL);
|
|
if (nshared) {
|
|
shared = nshared;
|
|
continue;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
shared = nshared;
|
|
shared_count = fobj ? fobj->shared_count : 0;
|
|
for (i = 0; i < shared_count; ++i) {
|
|
shared[i] = rcu_dereference(fobj->shared[i]);
|
|
if (!dma_fence_get_rcu(shared[i]))
|
|
break;
|
|
}
|
|
|
|
if (!pfence_excl && fence_excl) {
|
|
shared[i] = fence_excl;
|
|
fence_excl = NULL;
|
|
++i;
|
|
++shared_count;
|
|
}
|
|
}
|
|
|
|
if (i != shared_count || read_seqcount_retry(&obj->seq, seq)) {
|
|
while (i--)
|
|
dma_fence_put(shared[i]);
|
|
dma_fence_put(fence_excl);
|
|
goto unlock;
|
|
}
|
|
|
|
ret = 0;
|
|
unlock:
|
|
rcu_read_unlock();
|
|
} while (ret);
|
|
|
|
if (!shared_count) {
|
|
kfree(shared);
|
|
shared = NULL;
|
|
}
|
|
|
|
*pshared_count = shared_count;
|
|
*pshared = shared;
|
|
if (pfence_excl)
|
|
*pfence_excl = fence_excl;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(reservation_object_get_fences_rcu);
|
|
|
|
/**
|
|
* reservation_object_wait_timeout_rcu - Wait on reservation's objects
|
|
* shared and/or exclusive fences.
|
|
* @obj: the reservation object
|
|
* @wait_all: if true, wait on all fences, else wait on just exclusive fence
|
|
* @intr: if true, do interruptible wait
|
|
* @timeout: timeout value in jiffies or zero to return immediately
|
|
*
|
|
* RETURNS
|
|
* Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
|
|
* greater than zer on success.
|
|
*/
|
|
long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
|
|
bool wait_all, bool intr,
|
|
unsigned long timeout)
|
|
{
|
|
struct dma_fence *fence;
|
|
unsigned seq, shared_count;
|
|
long ret = timeout ? timeout : 1;
|
|
int i;
|
|
|
|
retry:
|
|
shared_count = 0;
|
|
seq = read_seqcount_begin(&obj->seq);
|
|
rcu_read_lock();
|
|
i = -1;
|
|
|
|
fence = rcu_dereference(obj->fence_excl);
|
|
if (fence && !test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
|
|
if (!dma_fence_get_rcu(fence))
|
|
goto unlock_retry;
|
|
|
|
if (dma_fence_is_signaled(fence)) {
|
|
dma_fence_put(fence);
|
|
fence = NULL;
|
|
}
|
|
|
|
} else {
|
|
fence = NULL;
|
|
}
|
|
|
|
if (wait_all) {
|
|
struct reservation_object_list *fobj =
|
|
rcu_dereference(obj->fence);
|
|
|
|
if (fobj)
|
|
shared_count = fobj->shared_count;
|
|
|
|
for (i = 0; !fence && i < shared_count; ++i) {
|
|
struct dma_fence *lfence = rcu_dereference(fobj->shared[i]);
|
|
|
|
if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
|
|
&lfence->flags))
|
|
continue;
|
|
|
|
if (!dma_fence_get_rcu(lfence))
|
|
goto unlock_retry;
|
|
|
|
if (dma_fence_is_signaled(lfence)) {
|
|
dma_fence_put(lfence);
|
|
continue;
|
|
}
|
|
|
|
fence = lfence;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
if (fence) {
|
|
if (read_seqcount_retry(&obj->seq, seq)) {
|
|
dma_fence_put(fence);
|
|
goto retry;
|
|
}
|
|
|
|
ret = dma_fence_wait_timeout(fence, intr, ret);
|
|
dma_fence_put(fence);
|
|
if (ret > 0 && wait_all && (i + 1 < shared_count))
|
|
goto retry;
|
|
}
|
|
return ret;
|
|
|
|
unlock_retry:
|
|
rcu_read_unlock();
|
|
goto retry;
|
|
}
|
|
EXPORT_SYMBOL_GPL(reservation_object_wait_timeout_rcu);
|
|
|
|
|
|
static inline int
|
|
reservation_object_test_signaled_single(struct dma_fence *passed_fence)
|
|
{
|
|
struct dma_fence *fence, *lfence = passed_fence;
|
|
int ret = 1;
|
|
|
|
if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &lfence->flags)) {
|
|
fence = dma_fence_get_rcu(lfence);
|
|
if (!fence)
|
|
return -1;
|
|
|
|
ret = !!dma_fence_is_signaled(fence);
|
|
dma_fence_put(fence);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* reservation_object_test_signaled_rcu - Test if a reservation object's
|
|
* fences have been signaled.
|
|
* @obj: the reservation object
|
|
* @test_all: if true, test all fences, otherwise only test the exclusive
|
|
* fence
|
|
*
|
|
* RETURNS
|
|
* true if all fences signaled, else false
|
|
*/
|
|
bool reservation_object_test_signaled_rcu(struct reservation_object *obj,
|
|
bool test_all)
|
|
{
|
|
unsigned seq, shared_count;
|
|
int ret;
|
|
|
|
rcu_read_lock();
|
|
retry:
|
|
ret = true;
|
|
shared_count = 0;
|
|
seq = read_seqcount_begin(&obj->seq);
|
|
|
|
if (test_all) {
|
|
unsigned i;
|
|
|
|
struct reservation_object_list *fobj =
|
|
rcu_dereference(obj->fence);
|
|
|
|
if (fobj)
|
|
shared_count = fobj->shared_count;
|
|
|
|
for (i = 0; i < shared_count; ++i) {
|
|
struct dma_fence *fence = rcu_dereference(fobj->shared[i]);
|
|
|
|
ret = reservation_object_test_signaled_single(fence);
|
|
if (ret < 0)
|
|
goto retry;
|
|
else if (!ret)
|
|
break;
|
|
}
|
|
|
|
if (read_seqcount_retry(&obj->seq, seq))
|
|
goto retry;
|
|
}
|
|
|
|
if (!shared_count) {
|
|
struct dma_fence *fence_excl = rcu_dereference(obj->fence_excl);
|
|
|
|
if (fence_excl) {
|
|
ret = reservation_object_test_signaled_single(
|
|
fence_excl);
|
|
if (ret < 0)
|
|
goto retry;
|
|
|
|
if (read_seqcount_retry(&obj->seq, seq))
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(reservation_object_test_signaled_rcu);
|