linux_dsm_epyc7002/drivers/gpu/drm/i915/selftests/mock_engine.c
Chris Wilson 32eb6bcfdd drm/i915: Make request allocation caches global
As kmem_caches share the same properties (size, allocation/free behaviour)
for all potential devices, we can use global caches. While this
potential has worse fragmentation behaviour (one can argue that
different devices would have different activity lifetimes, but you can
also argue that activity is temporal across the system) it is the
default behaviour of the system at large to amalgamate matching caches.

The benefit for us is much reduced pointer dancing along the frequent
allocation paths.

v2: Defer shrinking until after a global grace period for futureproofing
multiple consumers of the slab caches, similar to the current strategy
for avoiding shrinking too early.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190228102035.5857-1-chris@chris-wilson.co.uk
2019-02-28 11:07:56 +00:00

298 lines
7.2 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.
*
*/
#include "mock_engine.h"
#include "mock_request.h"
struct mock_ring {
struct intel_ring base;
struct i915_timeline timeline;
};
static void mock_timeline_pin(struct i915_timeline *tl)
{
tl->pin_count++;
}
static void mock_timeline_unpin(struct i915_timeline *tl)
{
GEM_BUG_ON(!tl->pin_count);
tl->pin_count--;
}
static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
{
const unsigned long sz = PAGE_SIZE / 2;
struct mock_ring *ring;
ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);
if (!ring)
return NULL;
if (i915_timeline_init(engine->i915,
&ring->timeline, engine->name,
NULL)) {
kfree(ring);
return NULL;
}
ring->base.size = sz;
ring->base.effective_size = sz;
ring->base.vaddr = (void *)(ring + 1);
ring->base.timeline = &ring->timeline;
INIT_LIST_HEAD(&ring->base.request_list);
intel_ring_update_space(&ring->base);
return &ring->base;
}
static void mock_ring_free(struct intel_ring *base)
{
struct mock_ring *ring = container_of(base, typeof(*ring), base);
i915_timeline_fini(&ring->timeline);
kfree(ring);
}
static struct i915_request *first_request(struct mock_engine *engine)
{
return list_first_entry_or_null(&engine->hw_queue,
struct i915_request,
mock.link);
}
static void advance(struct i915_request *request)
{
list_del_init(&request->mock.link);
i915_request_mark_complete(request);
GEM_BUG_ON(!i915_request_completed(request));
intel_engine_queue_breadcrumbs(request->engine);
}
static void hw_delay_complete(struct timer_list *t)
{
struct mock_engine *engine = from_timer(engine, t, hw_delay);
struct i915_request *request;
unsigned long flags;
spin_lock_irqsave(&engine->hw_lock, flags);
/* Timer fired, first request is complete */
request = first_request(engine);
if (request)
advance(request);
/*
* Also immediately signal any subsequent 0-delay requests, but
* requeue the timer for the next delayed request.
*/
while ((request = first_request(engine))) {
if (request->mock.delay) {
mod_timer(&engine->hw_delay,
jiffies + request->mock.delay);
break;
}
advance(request);
}
spin_unlock_irqrestore(&engine->hw_lock, flags);
}
static void mock_context_unpin(struct intel_context *ce)
{
mock_timeline_unpin(ce->ring->timeline);
i915_gem_context_put(ce->gem_context);
}
static void mock_context_destroy(struct intel_context *ce)
{
GEM_BUG_ON(ce->pin_count);
if (ce->ring)
mock_ring_free(ce->ring);
}
static const struct intel_context_ops mock_context_ops = {
.unpin = mock_context_unpin,
.destroy = mock_context_destroy,
};
static struct intel_context *
mock_context_pin(struct intel_engine_cs *engine,
struct i915_gem_context *ctx)
{
struct intel_context *ce = to_intel_context(ctx, engine);
int err = -ENOMEM;
if (ce->pin_count++)
return ce;
if (!ce->ring) {
ce->ring = mock_ring(engine);
if (!ce->ring)
goto err;
}
mock_timeline_pin(ce->ring->timeline);
ce->ops = &mock_context_ops;
i915_gem_context_get(ctx);
return ce;
err:
ce->pin_count = 0;
return ERR_PTR(err);
}
static int mock_request_alloc(struct i915_request *request)
{
INIT_LIST_HEAD(&request->mock.link);
request->mock.delay = 0;
return 0;
}
static int mock_emit_flush(struct i915_request *request,
unsigned int flags)
{
return 0;
}
static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs)
{
return cs;
}
static void mock_submit_request(struct i915_request *request)
{
struct mock_engine *engine =
container_of(request->engine, typeof(*engine), base);
unsigned long flags;
i915_request_submit(request);
spin_lock_irqsave(&engine->hw_lock, flags);
list_add_tail(&request->mock.link, &engine->hw_queue);
if (list_is_first(&request->mock.link, &engine->hw_queue)) {
if (request->mock.delay)
mod_timer(&engine->hw_delay,
jiffies + request->mock.delay);
else
advance(request);
}
spin_unlock_irqrestore(&engine->hw_lock, flags);
}
struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
const char *name,
int id)
{
struct mock_engine *engine;
GEM_BUG_ON(id >= I915_NUM_ENGINES);
engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
if (!engine)
return NULL;
/* minimal engine setup for requests */
engine->base.i915 = i915;
snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);
engine->base.id = id;
engine->base.status_page.addr = (void *)(engine + 1);
engine->base.context_pin = mock_context_pin;
engine->base.request_alloc = mock_request_alloc;
engine->base.emit_flush = mock_emit_flush;
engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb;
engine->base.submit_request = mock_submit_request;
if (i915_timeline_init(i915,
&engine->base.timeline,
engine->base.name,
NULL))
goto err_free;
i915_timeline_set_subclass(&engine->base.timeline, TIMELINE_ENGINE);
intel_engine_init_breadcrumbs(&engine->base);
/* fake hw queue */
spin_lock_init(&engine->hw_lock);
timer_setup(&engine->hw_delay, hw_delay_complete, 0);
INIT_LIST_HEAD(&engine->hw_queue);
if (IS_ERR(intel_context_pin(i915->kernel_context, &engine->base)))
goto err_breadcrumbs;
return &engine->base;
err_breadcrumbs:
intel_engine_fini_breadcrumbs(&engine->base);
i915_timeline_fini(&engine->base.timeline);
err_free:
kfree(engine);
return NULL;
}
void mock_engine_flush(struct intel_engine_cs *engine)
{
struct mock_engine *mock =
container_of(engine, typeof(*mock), base);
struct i915_request *request, *rn;
del_timer_sync(&mock->hw_delay);
spin_lock_irq(&mock->hw_lock);
list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link)
advance(request);
spin_unlock_irq(&mock->hw_lock);
}
void mock_engine_reset(struct intel_engine_cs *engine)
{
}
void mock_engine_free(struct intel_engine_cs *engine)
{
struct mock_engine *mock =
container_of(engine, typeof(*mock), base);
struct intel_context *ce;
GEM_BUG_ON(timer_pending(&mock->hw_delay));
ce = fetch_and_zero(&engine->last_retired_context);
if (ce)
intel_context_unpin(ce);
__intel_context_unpin(engine->i915->kernel_context, engine);
intel_engine_fini_breadcrumbs(engine);
i915_timeline_fini(&engine->timeline);
kfree(engine);
}