c1aaee9438
dma_fence_wait_timeout (along with a host of other jiffies-based timeouting functions) returns zero both in case of timeout and when the wait completes during the last jiffy before timeout. As such, we can't rely on it to distinguish between success and timeout. To prevent confusing callers by returning -EAGAIN before the timeout period has elapsed, check if the fence got signaled again after the wait. Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
533 lines
12 KiB
C
533 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Tegra host1x Syncpoints
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*
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* Copyright (c) 2010-2015, NVIDIA Corporation.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/dma-fence.h>
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#include <linux/slab.h>
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#include <trace/events/host1x.h>
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#include "syncpt.h"
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#include "dev.h"
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#include "intr.h"
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#include "debug.h"
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#define SYNCPT_CHECK_PERIOD (2 * HZ)
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#define MAX_STUCK_CHECK_COUNT 15
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static struct host1x_syncpt_base *
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host1x_syncpt_base_request(struct host1x *host)
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{
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struct host1x_syncpt_base *bases = host->bases;
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unsigned int i;
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for (i = 0; i < host->info->nb_bases; i++)
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if (!bases[i].requested)
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break;
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if (i >= host->info->nb_bases)
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return NULL;
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bases[i].requested = true;
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return &bases[i];
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}
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static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)
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{
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if (base)
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base->requested = false;
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}
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/**
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* host1x_syncpt_alloc() - allocate a syncpoint
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* @host: host1x device data
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* @flags: bitfield of HOST1X_SYNCPT_* flags
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* @name: name for the syncpoint for use in debug prints
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*
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* Allocates a hardware syncpoint for the caller's use. The caller then has
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* the sole authority to mutate the syncpoint's value until it is freed again.
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*
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* If no free syncpoints are available, or a NULL name was specified, returns
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* NULL.
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*/
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struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,
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unsigned long flags,
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const char *name)
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{
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struct host1x_syncpt *sp = host->syncpt;
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char *full_name;
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unsigned int i;
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if (!name)
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return NULL;
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mutex_lock(&host->syncpt_mutex);
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for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++)
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;
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if (i >= host->info->nb_pts)
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goto unlock;
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if (flags & HOST1X_SYNCPT_HAS_BASE) {
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sp->base = host1x_syncpt_base_request(host);
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if (!sp->base)
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goto unlock;
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}
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full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name);
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if (!full_name)
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goto free_base;
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sp->name = full_name;
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if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)
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sp->client_managed = true;
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else
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sp->client_managed = false;
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kref_init(&sp->ref);
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mutex_unlock(&host->syncpt_mutex);
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return sp;
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free_base:
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host1x_syncpt_base_free(sp->base);
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sp->base = NULL;
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unlock:
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mutex_unlock(&host->syncpt_mutex);
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return NULL;
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}
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EXPORT_SYMBOL(host1x_syncpt_alloc);
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/**
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* host1x_syncpt_id() - retrieve syncpoint ID
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* @sp: host1x syncpoint
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*
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* Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is
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* often used as a value to program into registers that control how hardware
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* blocks interact with syncpoints.
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*/
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u32 host1x_syncpt_id(struct host1x_syncpt *sp)
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{
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return sp->id;
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}
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EXPORT_SYMBOL(host1x_syncpt_id);
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/**
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* host1x_syncpt_incr_max() - update the value sent to hardware
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* @sp: host1x syncpoint
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* @incrs: number of increments
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*/
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u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)
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{
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return (u32)atomic_add_return(incrs, &sp->max_val);
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}
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EXPORT_SYMBOL(host1x_syncpt_incr_max);
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/*
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* Write cached syncpoint and waitbase values to hardware.
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*/
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void host1x_syncpt_restore(struct host1x *host)
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{
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struct host1x_syncpt *sp_base = host->syncpt;
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unsigned int i;
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for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
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/*
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* Unassign syncpt from channels for purposes of Tegra186
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* syncpoint protection. This prevents any channel from
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* accessing it until it is reassigned.
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*/
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host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);
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host1x_hw_syncpt_restore(host, sp_base + i);
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}
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for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
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host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
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host1x_hw_syncpt_enable_protection(host);
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wmb();
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}
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/*
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* Update the cached syncpoint and waitbase values by reading them
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* from the registers.
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*/
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void host1x_syncpt_save(struct host1x *host)
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{
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struct host1x_syncpt *sp_base = host->syncpt;
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unsigned int i;
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for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
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if (host1x_syncpt_client_managed(sp_base + i))
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host1x_hw_syncpt_load(host, sp_base + i);
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else
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WARN_ON(!host1x_syncpt_idle(sp_base + i));
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}
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for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
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host1x_hw_syncpt_load_wait_base(host, sp_base + i);
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}
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/*
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* Updates the cached syncpoint value by reading a new value from the hardware
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* register
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*/
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u32 host1x_syncpt_load(struct host1x_syncpt *sp)
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{
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u32 val;
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val = host1x_hw_syncpt_load(sp->host, sp);
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trace_host1x_syncpt_load_min(sp->id, val);
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return val;
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}
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/*
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* Get the current syncpoint base
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*/
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u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)
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{
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host1x_hw_syncpt_load_wait_base(sp->host, sp);
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return sp->base_val;
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}
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/**
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* host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache
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* @sp: host1x syncpoint
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*/
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int host1x_syncpt_incr(struct host1x_syncpt *sp)
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{
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return host1x_hw_syncpt_cpu_incr(sp->host, sp);
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}
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EXPORT_SYMBOL(host1x_syncpt_incr);
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/**
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* host1x_syncpt_wait() - wait for a syncpoint to reach a given value
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* @sp: host1x syncpoint
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* @thresh: threshold
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* @timeout: maximum time to wait for the syncpoint to reach the given value
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* @value: return location for the syncpoint value
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*/
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int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
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u32 *value)
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{
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struct dma_fence *fence;
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long wait_err;
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host1x_hw_syncpt_load(sp->host, sp);
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if (value)
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*value = host1x_syncpt_load(sp);
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if (host1x_syncpt_is_expired(sp, thresh))
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return 0;
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if (timeout < 0)
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timeout = LONG_MAX;
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else if (timeout == 0)
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return -EAGAIN;
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fence = host1x_fence_create(sp, thresh, false);
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if (IS_ERR(fence))
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return PTR_ERR(fence);
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wait_err = dma_fence_wait_timeout(fence, true, timeout);
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if (wait_err == 0)
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host1x_fence_cancel(fence);
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dma_fence_put(fence);
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if (value)
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*value = host1x_syncpt_load(sp);
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/*
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* Don't rely on dma_fence_wait_timeout return value,
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* since it returns zero both on timeout and if the
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* wait completed with 0 jiffies left.
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*/
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host1x_hw_syncpt_load(sp->host, sp);
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if (wait_err == 0 && !host1x_syncpt_is_expired(sp, thresh))
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return -EAGAIN;
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else if (wait_err < 0)
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return wait_err;
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else
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return 0;
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}
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EXPORT_SYMBOL(host1x_syncpt_wait);
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/*
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* Returns true if syncpoint is expired, false if we may need to wait
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*/
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bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)
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{
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u32 current_val;
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smp_rmb();
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current_val = (u32)atomic_read(&sp->min_val);
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return ((current_val - thresh) & 0x80000000U) == 0U;
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}
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int host1x_syncpt_init(struct host1x *host)
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{
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struct host1x_syncpt_base *bases;
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struct host1x_syncpt *syncpt;
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unsigned int i;
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syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),
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GFP_KERNEL);
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if (!syncpt)
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return -ENOMEM;
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bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),
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GFP_KERNEL);
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if (!bases)
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return -ENOMEM;
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for (i = 0; i < host->info->nb_pts; i++) {
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syncpt[i].id = i;
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syncpt[i].host = host;
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}
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for (i = 0; i < host->info->nb_bases; i++)
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bases[i].id = i;
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mutex_init(&host->syncpt_mutex);
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host->syncpt = syncpt;
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host->bases = bases;
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/* Allocate sync point to use for clearing waits for expired fences */
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host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");
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if (!host->nop_sp)
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return -ENOMEM;
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if (host->info->reserve_vblank_syncpts) {
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kref_init(&host->syncpt[26].ref);
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kref_init(&host->syncpt[27].ref);
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}
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return 0;
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}
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/**
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* host1x_syncpt_request() - request a syncpoint
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* @client: client requesting the syncpoint
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* @flags: flags
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*
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* host1x client drivers can use this function to allocate a syncpoint for
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* subsequent use. A syncpoint returned by this function will be reserved for
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* use by the client exclusively. When no longer using a syncpoint, a host1x
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* client driver needs to release it using host1x_syncpt_put().
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*/
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struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
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unsigned long flags)
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{
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struct host1x *host = dev_get_drvdata(client->host->parent);
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return host1x_syncpt_alloc(host, flags, dev_name(client->dev));
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}
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EXPORT_SYMBOL(host1x_syncpt_request);
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static void syncpt_release(struct kref *ref)
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{
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struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);
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atomic_set(&sp->max_val, host1x_syncpt_read(sp));
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sp->locked = false;
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mutex_lock(&sp->host->syncpt_mutex);
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host1x_syncpt_base_free(sp->base);
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kfree(sp->name);
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sp->base = NULL;
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sp->name = NULL;
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sp->client_managed = false;
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mutex_unlock(&sp->host->syncpt_mutex);
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}
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/**
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* host1x_syncpt_put() - free a requested syncpoint
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* @sp: host1x syncpoint
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*
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* Release a syncpoint previously allocated using host1x_syncpt_request(). A
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* host1x client driver should call this when the syncpoint is no longer in
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* use.
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*/
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void host1x_syncpt_put(struct host1x_syncpt *sp)
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{
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if (!sp)
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return;
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kref_put(&sp->ref, syncpt_release);
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}
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EXPORT_SYMBOL(host1x_syncpt_put);
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void host1x_syncpt_deinit(struct host1x *host)
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{
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struct host1x_syncpt *sp = host->syncpt;
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unsigned int i;
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for (i = 0; i < host->info->nb_pts; i++, sp++)
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kfree(sp->name);
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}
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/**
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* host1x_syncpt_read_max() - read maximum syncpoint value
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* @sp: host1x syncpoint
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*
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* The maximum syncpoint value indicates how many operations there are in
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* queue, either in channel or in a software thread.
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*/
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u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
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{
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smp_rmb();
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return (u32)atomic_read(&sp->max_val);
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}
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EXPORT_SYMBOL(host1x_syncpt_read_max);
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/**
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* host1x_syncpt_read_min() - read minimum syncpoint value
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* @sp: host1x syncpoint
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*
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* The minimum syncpoint value is a shadow of the current sync point value in
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* hardware.
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*/
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u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
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{
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smp_rmb();
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return (u32)atomic_read(&sp->min_val);
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}
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EXPORT_SYMBOL(host1x_syncpt_read_min);
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/**
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* host1x_syncpt_read() - read the current syncpoint value
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* @sp: host1x syncpoint
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*/
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u32 host1x_syncpt_read(struct host1x_syncpt *sp)
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{
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return host1x_syncpt_load(sp);
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}
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EXPORT_SYMBOL(host1x_syncpt_read);
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unsigned int host1x_syncpt_nb_pts(struct host1x *host)
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{
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return host->info->nb_pts;
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}
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unsigned int host1x_syncpt_nb_bases(struct host1x *host)
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{
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return host->info->nb_bases;
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}
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unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
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{
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return host->info->nb_mlocks;
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}
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/**
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* host1x_syncpt_get_by_id() - obtain a syncpoint by ID
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* @host: host1x controller
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* @id: syncpoint ID
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*/
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struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,
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unsigned int id)
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{
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if (id >= host->info->nb_pts)
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return NULL;
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if (kref_get_unless_zero(&host->syncpt[id].ref))
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return &host->syncpt[id];
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else
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return NULL;
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}
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EXPORT_SYMBOL(host1x_syncpt_get_by_id);
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/**
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* host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't
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* increase the refcount.
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* @host: host1x controller
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* @id: syncpoint ID
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*/
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struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,
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unsigned int id)
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{
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if (id >= host->info->nb_pts)
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return NULL;
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return &host->syncpt[id];
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}
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EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref);
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/**
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* host1x_syncpt_get() - increment syncpoint refcount
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* @sp: syncpoint
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*/
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struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp)
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{
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kref_get(&sp->ref);
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return sp;
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}
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EXPORT_SYMBOL(host1x_syncpt_get);
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/**
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* host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint
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* @sp: host1x syncpoint
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*/
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struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)
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{
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return sp ? sp->base : NULL;
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}
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EXPORT_SYMBOL(host1x_syncpt_get_base);
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/**
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* host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base
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* @base: host1x syncpoint wait base
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*/
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u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)
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{
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return base->id;
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}
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EXPORT_SYMBOL(host1x_syncpt_base_id);
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static void do_nothing(struct kref *ref)
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{
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}
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/**
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* host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint
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* available for allocation
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*
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* @client: host1x bus client
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* @syncpt_id: syncpoint ID to make available
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*
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* Makes VBLANK<i> syncpoint available for allocatation if it was
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* reserved at initialization time. This should be called by the display
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* driver after it has ensured that any VBLANK increment programming configured
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* by the boot chain has been disabled.
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*/
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void host1x_syncpt_release_vblank_reservation(struct host1x_client *client,
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u32 syncpt_id)
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{
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struct host1x *host = dev_get_drvdata(client->host->parent);
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if (!host->info->reserve_vblank_syncpts)
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return;
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kref_put(&host->syncpt[syncpt_id].ref, do_nothing);
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}
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EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);
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