mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 17:01:14 +00:00
79ffac8599
In the current scheme, on submitting a request we take a single global GEM wakeref, which trickles down to wake up all GT power domains. This is undesirable as we would like to be able to localise our power management to the available power domains and to remove the global GEM operations from the heart of the driver. (The intent there is to push global GEM decisions to the boundary as used by the GEM user interface.) Now during request construction, each request is responsible via its logical context to acquire a wakeref on each power domain it intends to utilize. Currently, each request takes a wakeref on the engine(s) and the engines themselves take a chipset wakeref. This gives us a transition on each engine which we can extend if we want to insert more powermangement control (such as soft rc6). The global GEM operations that currently require a struct_mutex are reduced to listening to pm events from the chipset GT wakeref. As we reduce the struct_mutex requirement, these listeners should evaporate. Perhaps the biggest immediate change is that this removes the struct_mutex requirement around GT power management, allowing us greater flexibility in request construction. Another important knock-on effect, is that by tracking engine usage, we can insert a switch back to the kernel context on that engine immediately, avoiding any extra delay or inserting global synchronisation barriers. This makes tracking when an engine and its associated contexts are idle much easier -- important for when we forgo our assumed execution ordering and need idle barriers to unpin used contexts. In the process, it means we remove a large chunk of code whose only purpose was to switch back to the kernel context. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190424200717.1686-5-chris@chris-wilson.co.uk
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*
|
|
* Copyright © 2016 Intel Corporation
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#ifndef __I915_GEM_H__
|
|
#define __I915_GEM_H__
|
|
|
|
#include <linux/bug.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
struct drm_i915_private;
|
|
|
|
#ifdef CONFIG_DRM_I915_DEBUG_GEM
|
|
|
|
#define GEM_SHOW_DEBUG() (drm_debug & DRM_UT_DRIVER)
|
|
|
|
#define GEM_BUG_ON(condition) do { if (unlikely((condition))) { \
|
|
pr_err("%s:%d GEM_BUG_ON(%s)\n", \
|
|
__func__, __LINE__, __stringify(condition)); \
|
|
GEM_TRACE("%s:%d GEM_BUG_ON(%s)\n", \
|
|
__func__, __LINE__, __stringify(condition)); \
|
|
BUG(); \
|
|
} \
|
|
} while(0)
|
|
#define GEM_WARN_ON(expr) WARN_ON(expr)
|
|
|
|
#define GEM_DEBUG_DECL(var) var
|
|
#define GEM_DEBUG_EXEC(expr) expr
|
|
#define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
|
|
#define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
|
|
|
|
#else
|
|
|
|
#define GEM_SHOW_DEBUG() (0)
|
|
|
|
#define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
|
|
#define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
|
|
|
|
#define GEM_DEBUG_DECL(var)
|
|
#define GEM_DEBUG_EXEC(expr) do { } while (0)
|
|
#define GEM_DEBUG_BUG_ON(expr)
|
|
#define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
|
|
#define GEM_TRACE(...) trace_printk(__VA_ARGS__)
|
|
#define GEM_TRACE_DUMP() ftrace_dump(DUMP_ALL)
|
|
#define GEM_TRACE_DUMP_ON(expr) \
|
|
do { if (expr) ftrace_dump(DUMP_ALL); } while (0)
|
|
#else
|
|
#define GEM_TRACE(...) do { } while (0)
|
|
#define GEM_TRACE_DUMP() do { } while (0)
|
|
#define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
|
|
#endif
|
|
|
|
#define I915_GEM_IDLE_TIMEOUT (HZ / 5)
|
|
|
|
static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
|
|
{
|
|
if (!atomic_fetch_inc(&t->count))
|
|
tasklet_unlock_wait(t);
|
|
}
|
|
|
|
static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
|
|
{
|
|
return !atomic_read(&t->count);
|
|
}
|
|
|
|
static inline bool __tasklet_enable(struct tasklet_struct *t)
|
|
{
|
|
return atomic_dec_and_test(&t->count);
|
|
}
|
|
|
|
#endif /* __I915_GEM_H__ */
|