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/*
* Copyright © 2014 Broadcom
*
* 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.
*/
/** @file vc4_fence.c
*
* Seqno-based fence management.
*
* We have two mechanisms for waiting in our kernel API: You can wait on a BO
* to have all rendering to from any process to be completed, or wait on a
* seqno for that particular seqno to be passed. The fence API we're
* implementing is based on waiting for all rendering in the context to have
* completed (with no reference to what other processes might be doing with
* the same BOs), so we can just use the seqno of the last rendering we'd
* fired off as our fence marker.
*/
#include <libsync.h>
#include <fcntl.h>
#include "util/u_inlines.h"
#include "vc4_screen.h"
#include "vc4_context.h"
#include "vc4_bufmgr.h"
struct vc4_fence {
struct pipe_reference reference;
uint64_t seqno;
int fd;
};
static inline struct vc4_fence *
vc4_fence(struct pipe_fence_handle *pfence)
{
return (struct vc4_fence *)pfence;
}
static void
vc4_fence_reference(struct pipe_screen *pscreen,
struct pipe_fence_handle **pp,
struct pipe_fence_handle *pf)
{
struct vc4_fence **p = (struct vc4_fence **)pp;
struct vc4_fence *f = vc4_fence(pf);
struct vc4_fence *old = *p;
if (pipe_reference(&(*p)->reference, &f->reference)) {
if (old->fd >= 0)
close(old->fd);
free(old);
}
*p = f;
}
static boolean
vc4_fence_finish(struct pipe_screen *pscreen,
struct pipe_context *ctx,
struct pipe_fence_handle *pf,
uint64_t timeout_ns)
{
struct vc4_screen *screen = vc4_screen(pscreen);
struct vc4_fence *f = vc4_fence(pf);
if (f->fd >= 0)
return sync_wait(f->fd, timeout_ns / 1000000) == 0;
return vc4_wait_seqno(screen, f->seqno, timeout_ns, "fence wait");
}
struct vc4_fence *
vc4_fence_create(struct vc4_screen *screen, uint64_t seqno, int fd)
{
struct vc4_fence *f = calloc(1, sizeof(*f));
if (!f)
return NULL;
pipe_reference_init(&f->reference, 1);
f->seqno = seqno;
f->fd = fd;
return f;
}
static void
vc4_fence_create_fd(struct pipe_context *pctx, struct pipe_fence_handle **pf,
int fd, enum pipe_fd_type type)
{
struct vc4_context *vc4 = vc4_context(pctx);
struct vc4_fence **fence = (struct vc4_fence **)pf;
assert(type == PIPE_FD_TYPE_NATIVE_SYNC);
*fence = vc4_fence_create(vc4->screen, vc4->last_emit_seqno,
fcntl(fd, F_DUPFD_CLOEXEC, 3));
}
static void
vc4_fence_server_sync(struct pipe_context *pctx,
struct pipe_fence_handle *pfence)
{
struct vc4_context *vc4 = vc4_context(pctx);
struct vc4_fence *fence = vc4_fence(pfence);
sync_accumulate("vc4", &vc4->in_fence_fd, fence->fd);
}
static int
vc4_fence_get_fd(struct pipe_screen *screen, struct pipe_fence_handle *pfence)
{
struct vc4_fence *fence = vc4_fence(pfence);
return fcntl(fence->fd, F_DUPFD_CLOEXEC, 3);
}
int
vc4_fence_context_init(struct vc4_context *vc4)
{
vc4->base.create_fence_fd = vc4_fence_create_fd;
vc4->base.fence_server_sync = vc4_fence_server_sync;
vc4->in_fence_fd = -1;
/* Since we initialize the in_fence_fd to -1 (no wait necessary),
* we also need to initialize our in_syncobj as signaled.
*/
return drmSyncobjCreate(vc4->fd, DRM_SYNCOBJ_CREATE_SIGNALED,
&vc4->in_syncobj);
}
void
vc4_fence_screen_init(struct vc4_screen *screen)
{
screen->base.fence_reference = vc4_fence_reference;
screen->base.fence_finish = vc4_fence_finish;
screen->base.fence_get_fd = vc4_fence_get_fd;
}
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