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host1x_emu: SyncpointIncre per-improvement

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1. Add mechanism(s) to trigger syncpoint fence scan when
syncpoint increment UMD called. Following methods are added.
 - METHOD-1: Check fence expire in user context when syncpoint
   increment  UMD API is  called.
 - METHOD-2: Add tasklet based mechanism that schedule tasklet to scan for
   syncpoint fence expiry. This also improve signaling latency.

   METHOD-1 is enabled by default, to enable METHOD-2 define MACRO
   "HOST1X_EMU_SYNC_INC_TASKLET".

2. Add interface "host1x_syncpt_fence_scan()" that can be called from
   client interrupt handler to initiate syncpoint fence scan.

Jira HOSTX-5527

Change-Id: I4d5a0ba9fd67042d824a1df2794b316831001dc4
Signed-off-by: amitabhd <amitabhd@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3267144
Reviewed-by: Raghavendra Vishnu Kumar <rvk@nvidia.com>
Reviewed-by: Sanif Veeras <sveeras@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Leslin Varghese <lvarghese@nvidia.com>
This commit is contained in:
amitabhd
2024-12-12 18:03:55 +00:00
committed by Jon Hunter
parent 676ada0f2b
commit a2dba7e53b
7 changed files with 88 additions and 48 deletions
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36
drivers/gpu/host1x-emu/syncpt.c
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@@ -1,17 +1,33 @@
/*
* SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: GPL-2.0-only
*/
// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-fence.h>
#include <linux/slab.h>
#include <linux/timekeeping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include "dev.h"
#include "syncpt.h"
#ifdef HOST1X_EMU_SYNC_INC_TASKLET
static void tasklet_fn(struct tasklet_struct *unused);
static DEFINE_PER_CPU(struct host1x_syncpt *, tasklet_sp);
DECLARE_TASKLET(syncpt_tasklet, tasklet_fn);
static void tasklet_fn(struct tasklet_struct *unused)
{
struct host1x_syncpt *sp = NULL;
sp = this_cpu_read(tasklet_sp);
if (sp != NULL)
host1x_poll_irq_check_syncpt_fence(sp);
}
#endif
static void syncpt_release(struct kref *ref)
{
struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);
@@ -241,7 +257,17 @@ HOST1X_EMU_EXPORT_SYMBOL(host1x_syncpt_read_max);
*/
HOST1X_EMU_EXPORT_DECL(int, host1x_syncpt_incr(struct host1x_syncpt *sp))
{
return host1x_hw_syncpt_cpu_incr(sp->host, sp);
int err;
err = host1x_hw_syncpt_cpu_incr(sp->host, sp);
#ifdef HOST1X_EMU_SYNC_INC_TASKLET
/*Improve Signaling performance*/
this_cpu_write(tasklet_sp, sp);
tasklet_schedule(&syncpt_tasklet);
#else
host1x_poll_irq_check_syncpt_fence(sp);
#endif
return err;
}
HOST1X_EMU_EXPORT_SYMBOL(host1x_syncpt_incr);