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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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99f8284367
Up until recently sync_file were create to export a single dma-fence to userspace, and so we could canabalise a bit insie dma-fence to mark whether or not we had enable polling for the sync_file itself. However, with the advent of syncobj, we do allow userspace to create multiple sync_files for a single dma-fence. (Similarly, that the sw-sync validation framework also started returning multiple sync-files wrapping a single dma-fence for a syncpt also triggering the problem.) This patch reverts my suggestion in commite241655373("dma-buf/sync_file: only enable fence signalling on poll()") to use a single bit in the shared dma-fence and restores the sync_file->flags for tracking the bits individually. Reported-by: Gustavo Padovan <gustavo.padovan@collabora.com> Fixes:f1e8c67123("dma-buf/sw-sync: Use an rbtree to sort fences in the timeline") Fixes:e9083420bb("drm: introduce sync objects (v4)") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Sean Paul <seanpaul@chromium.org> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: dri-devel@lists.freedesktop.org Cc: <drm-intel-fixes@lists.freedesktop.org> # v4.13-rc1+ Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170728212951.7818-1-chris@chris-wilson.co.uk (cherry picked from commitdb1fc97ca0)
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* include/linux/sync_file.h
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*
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* Copyright (C) 2012 Google, Inc.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _LINUX_SYNC_FILE_H
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#define _LINUX_SYNC_FILE_H
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#include <linux/types.h>
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#include <linux/ktime.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/dma-fence.h>
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#include <linux/dma-fence-array.h>
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/**
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* struct sync_file - sync file to export to the userspace
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* @file: file representing this fence
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* @sync_file_list: membership in global file list
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* @wq: wait queue for fence signaling
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* @fence: fence with the fences in the sync_file
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* @cb: fence callback information
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*/
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struct sync_file {
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struct file *file;
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/**
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* @user_name:
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*
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* Name of the sync file provided by userspace, for merged fences.
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* Otherwise generated through driver callbacks (in which case the
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* entire array is 0).
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*/
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char user_name[32];
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#ifdef CONFIG_DEBUG_FS
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struct list_head sync_file_list;
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#endif
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wait_queue_head_t wq;
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unsigned long flags;
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struct dma_fence *fence;
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struct dma_fence_cb cb;
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};
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#define POLL_ENABLED 0
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struct sync_file *sync_file_create(struct dma_fence *fence);
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struct dma_fence *sync_file_get_fence(int fd);
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char *sync_file_get_name(struct sync_file *sync_file, char *buf, int len);
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#endif /* _LINUX_SYNC_H */
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