| Bug ID | 100712 |
|---|---|
| Summary | ring 0 stalled after bytes_moved_threshold reached - Cap Verde - HD 7770 |
| Product | DRI |
| Version | DRI git |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/Radeon |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | julien.isorce@gmail.com |
Kernel 4.9 from https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-4.9 and latest mesa. (same result with drm-next-4.12 branch) Same result with kernel 4.8 and mesa 12.0.6. In kernel radeon_object.c::radeon_bo_list_validate, once "bytes_moved > bytes_moved_threshold" is reached (this is the case for 850 bo in the same list_for_each_entry loop), I can see that radeon_ib_schedule emits a fence that it takes more than the radeon.lockup_timeout to be signaled. In radeon_fence_activity, I checked that the "last_emitted" is the seq number for this last emited fence. And last_seq is equal to last_emitted-1. Then the next call to ttm_wait_bo blocks (15 * HZ > radeon.lockup_timeout) until gpu lockup which leads to a gpu reset. Also it seems the fence is signaled by swapper after more than 10 seconds but it is too late. I requires to reduce the "15" param above to 4 to see that. Is it normal that radeon_bo_list_validate still tries to move the bo if bytes_moved_threshold is reached ? Indeed ttm_bo_validate is always called (it blits from vram to vram). Is it also normal that ttm_bo_validate is called with evict flag as true once bytes_moved_threshold is reached ?
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