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Revert "drm/i915/gt: Wait for new requests in intel_gt_retire_requests()"

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From inside an active timeline in the execbuf ioctl, we may try to
reclaim some space in the GGTT. We need GGTT space for all objects on
!full-ppgtt platforms, and for context images everywhere. However, to
free up space in the GGTT we may need to remove some pinned objects
(e.g. context images) that require flushing the idle barriers to remove.
For this we use the big hammer of intel_gt_wait_for_idle()

However, commit 7936a22dd4 ("drm/i915/gt: Wait for new requests in
intel_gt_retire_requests()") will continue spinning on the wait if a
timeline is active but lacks requests, as is the case during execbuf
reservation. Spinning forever is quite time consuming, so revert that
commit and start again.

In practice, the effect commit 7936a22dd4 was trying to achieve is
accomplished by commit 1683d24c14 ("drm/i915/gt: Move new timelines
to the end of active_list"), so there is no immediate rush to replace
the looping.

Testcase: igt/gem_exec_reloc/basic-range
Fixes: 7936a22dd4 ("drm/i915/gt: Wait for new requests in intel_gt_retire_requests()")
References: 1683d24c14 ("drm/i915/gt: Move new timelines to the end of active_list")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191121071044.97798-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-11-21 07:10:40 +00:00
parent e18417b48b
commit 689122dcc3
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/i915/gt/intel_gt_requests.c
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@ -33,6 +33,7 @@ long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
{
struct intel_gt_timelines *timelines = &gt->timelines;
struct intel_timeline *tl, *tn;
unsigned long active_count = 0;
bool interruptible;
LIST_HEAD(free);
@ -44,8 +45,10 @@ long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
spin_lock(&timelines->lock);
list_for_each_entry_safe(tl, tn, &timelines->active_list, link) {
if (!mutex_trylock(&tl->mutex))
if (!mutex_trylock(&tl->mutex)) {
active_count++; /* report busy to caller, try again? */
continue;
}
intel_timeline_get(tl);
GEM_BUG_ON(!atomic_read(&tl->active_count));
@ -72,6 +75,8 @@ long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
list_safe_reset_next(tl, tn, link);
if (atomic_dec_and_test(&tl->active_count))
list_del(&tl->link);
else
active_count += !!rcu_access_pointer(tl->last_request.fence);
mutex_unlock(&tl->mutex);
@ -86,7 +91,7 @@ long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
list_for_each_entry_safe(tl, tn, &free, link)
__intel_timeline_free(&tl->kref);
return list_empty(&timelines->active_list) ? 0 : timeout;
return active_count ? timeout : 0;
}
int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout)