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If the preempted context takes too long to relinquish control, e.g. it is stuck inside a shader with arbitration disabled, evict that context with an engine reset. This ensures that preemptions are reasonably responsive, providing a tighter QoS for the more important context at the cost of flagging unresponsive contexts more frequently (i.e. instead of using an ~10s hangcheck, we now evict at ~100ms). The challenge of lies in picking a timeout that can be reasonably serviced by HW for typical workloads, balancing the existing clients against the needs for responsiveness. Note that coupled with timeslicing, this will lead to rapid GPU "hang" detection with multiple active contexts vying for GPU time. The forced preemption mechanism can be compiled out with ./scripts/config --set-val DRM_I915_PREEMPT_TIMEOUT 0 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191023133108.21401-2-chris@chris-wilson.co.uk
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* Copyright © 2016 Intel Corporation
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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 "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* 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 NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef __I915_GEM_H__
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#define __I915_GEM_H__
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#include <linux/bug.h>
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#include <linux/interrupt.h>
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#include <drm/drm_drv.h>
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struct drm_i915_private;
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#ifdef CONFIG_DRM_I915_DEBUG_GEM
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#define GEM_SHOW_DEBUG() (drm_debug & DRM_UT_DRIVER)
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#define GEM_BUG_ON(condition) do { if (unlikely((condition))) { \
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GEM_TRACE_ERR("%s:%d GEM_BUG_ON(%s)\n", \
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__func__, __LINE__, __stringify(condition)); \
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BUG(); \
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} \
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} while(0)
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#define GEM_WARN_ON(expr) WARN_ON(expr)
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#define GEM_DEBUG_DECL(var) var
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#define GEM_DEBUG_EXEC(expr) expr
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#define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
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#define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
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#else
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#define GEM_SHOW_DEBUG() (0)
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#define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
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#define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
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#define GEM_DEBUG_DECL(var)
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#define GEM_DEBUG_EXEC(expr) do { } while (0)
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#define GEM_DEBUG_BUG_ON(expr)
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#define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
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#endif
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#if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
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#define GEM_TRACE(...) trace_printk(__VA_ARGS__)
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#define GEM_TRACE_ERR(...) do { \
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pr_err(__VA_ARGS__); \
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trace_printk(__VA_ARGS__); \
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} while (0)
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#define GEM_TRACE_DUMP() ftrace_dump(DUMP_ALL)
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#define GEM_TRACE_DUMP_ON(expr) \
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do { if (expr) ftrace_dump(DUMP_ALL); } while (0)
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#else
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#define GEM_TRACE(...) do { } while (0)
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#define GEM_TRACE_ERR(...) do { } while (0)
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#define GEM_TRACE_DUMP() do { } while (0)
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#define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
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#endif
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#define I915_GEM_IDLE_TIMEOUT (HZ / 5)
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static inline void tasklet_lock(struct tasklet_struct *t)
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{
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while (!tasklet_trylock(t))
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cpu_relax();
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}
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static inline bool tasklet_is_locked(const struct tasklet_struct *t)
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{
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return test_bit(TASKLET_STATE_RUN, &t->state);
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}
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static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
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{
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if (!atomic_fetch_inc(&t->count))
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tasklet_unlock_wait(t);
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}
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static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
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{
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return !atomic_read(&t->count);
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}
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static inline bool __tasklet_enable(struct tasklet_struct *t)
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{
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return atomic_dec_and_test(&t->count);
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}
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static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
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{
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return test_bit(TASKLET_STATE_SCHED, &t->state);
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}
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#endif /* __I915_GEM_H__ */
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