// SPDX-License-Identifier: GPL-2.0-only/* * Tegra host1x Syncpoints * * Copyright (c) 2010-2015, NVIDIA Corporation. */ #include <linux/module.h>#include <linux/device.h>#include <linux/dma-fence.h>#include <linux/overflow.h>#include <linux/slab.h> #include <trace/events/host1x.h> #include "syncpt.h"#include "dev.h"#include "intr.h"#include "debug.h" #define SYNCPT_CHECK_PERIOD (2 * HZ)#define MAX_STUCK_CHECK_COUNT 15 static struct host1x_syncpt_base *host1x_syncpt_base_request(struct host1x *host){	struct host1x_syncpt_base *bases = host->bases;	unsigned int i; 	for (i = 0; i < host->info->nb_bases; i++)		if (!bases[i].requested)			break; 	if (i >= host->info->nb_bases)		return NULL; 	bases[i].requested = true;	return &bases[i];} static void host1x_syncpt_base_free(struct host1x_syncpt_base *base){	if (base)		base->requested = false;} /** * host1x_syncpt_alloc() - allocate a syncpoint * @host: host1x device data * @flags: bitfield of HOST1X_SYNCPT_* flags * @name: name for the syncpoint for use in debug prints * * Allocates a hardware syncpoint for the caller's use. The caller then has * the sole authority to mutate the syncpoint's value until it is freed again. * * If no free syncpoints are available, or a NULL name was specified, returns * NULL. */struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,					  unsigned long flags,					  const char *name){	struct host1x_syncpt *sp = host->syncpt;	char *full_name;	unsigned int i; 	if (!name)		return NULL; 	mutex_lock(&host->syncpt_mutex); 	for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++)		; 	if (i >= host->info->nb_pts)		goto unlock; 	if (flags & HOST1X_SYNCPT_HAS_BASE) {		sp->base = host1x_syncpt_base_request(host);		if (!sp->base)			goto unlock;	} 	full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name);	if (!full_name)		goto free_base; 	sp->name = full_name; 	if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)		sp->client_managed = true;	else		sp->client_managed = false; 	kref_init(&sp->ref); 	mutex_unlock(&host->syncpt_mutex);	return sp; free_base:	host1x_syncpt_base_free(sp->base);	sp->base = NULL;unlock:	mutex_unlock(&host->syncpt_mutex);	return NULL;}EXPORT_SYMBOL(host1x_syncpt_alloc); /** * host1x_syncpt_id() - retrieve syncpoint ID * @sp: host1x syncpoint * * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is * often used as a value to program into registers that control how hardware * blocks interact with syncpoints. */u32 host1x_syncpt_id(struct host1x_syncpt *sp){	return sp->id;}EXPORT_SYMBOL(host1x_syncpt_id); /** * host1x_syncpt_incr_max() - update the value sent to hardware * @sp: host1x syncpoint * @incrs: number of increments */u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs){	/*	 * Syncpoint values are intended to be modulo 2^32, so overflow	 * here is intended.	 */	return (u32)atomic_add_return(incrs, &sp->max_val);}EXPORT_SYMBOL(host1x_syncpt_incr_max);  /* * Write cached syncpoint and waitbase values to hardware. */void host1x_syncpt_restore(struct host1x *host){	struct host1x_syncpt *sp_base = host->syncpt;	unsigned int i; 	for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {		/*		 * Unassign syncpt from channels for purposes of Tegra186		 * syncpoint protection. This prevents any channel from		 * accessing it until it is reassigned.		 */		host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);		host1x_hw_syncpt_restore(host, sp_base + i);	} 	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)		host1x_hw_syncpt_restore_wait_base(host, sp_base + i); 	host1x_hw_syncpt_enable_protection(host); 	wmb();} /* * Update the cached syncpoint and waitbase values by reading them * from the registers.  */void host1x_syncpt_save(struct host1x *host){	struct host1x_syncpt *sp_base = host->syncpt;	unsigned int i; 	for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {		if (host1x_syncpt_client_managed(sp_base + i))			host1x_hw_syncpt_load(host, sp_base + i);		else			WARN_ON(!host1x_syncpt_idle(sp_base + i));	} 	for (i = 0; i < host1x_syncpt_nb_bases(host); i++)		host1x_hw_syncpt_load_wait_base(host, sp_base + i);} /* * Updates the cached syncpoint value by reading a new value from the hardware * register */u32 host1x_syncpt_load(struct host1x_syncpt *sp){	u32 val; 	val = host1x_hw_syncpt_load(sp->host, sp);	trace_host1x_syncpt_load_min(sp->id, val); 	return val;} /* * Get the current syncpoint base */u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp){	host1x_hw_syncpt_load_wait_base(sp->host, sp); 	return sp->base_val;} /** * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache * @sp: host1x syncpoint */int host1x_syncpt_incr(struct host1x_syncpt *sp){	return host1x_hw_syncpt_cpu_incr(sp->host, sp);}EXPORT_SYMBOL(host1x_syncpt_incr); /** * host1x_syncpt_wait() - wait for a syncpoint to reach a given value * @sp: host1x syncpoint * @thresh: threshold * @timeout: maximum time to wait for the syncpoint to reach the given value * @value: return location for the syncpoint value */int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,		       u32 *value){	struct dma_fence *fence;	long wait_err;	u32 curr; 	curr = host1x_syncpt_load(sp); 	if (value)		*value = curr; 	if (host1x_syncpt_is_expired(sp, thresh))		return 0; 	if (timeout < 0)		timeout = LONG_MAX;	else if (timeout == 0)		return -EAGAIN; 	fence = host1x_fence_create(sp, thresh, false);	if (IS_ERR(fence))		return PTR_ERR(fence); 	wait_err = dma_fence_wait_timeout(fence, true, timeout);	if (wait_err == 0)		host1x_fence_cancel(fence);	dma_fence_put(fence); 	/*	 * Don't rely on dma_fence_wait_timeout return value,	 * since it returns zero both on timeout and if the	 * wait completed with 0 jiffies left.	 */	if (wait_err == 0 && !host1x_syncpt_is_expired(sp, thresh)) {		if (value)			*value = host1x_syncpt_load(sp); 		return -EAGAIN;	} else if (wait_err < 0) {		return wait_err;	} else {		/* Success, read the value cached by ISR */		if (value)			*value = host1x_syncpt_read_min(sp); 		return 0;	}}EXPORT_SYMBOL(host1x_syncpt_wait); /* * Returns true if syncpoint is expired, false if we may need to wait */bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh){	u32 current_val; 	smp_rmb(); 	current_val = (u32)atomic_read(&sp->min_val); 	return (wrapping_sub(u32, current_val, thresh) & 0x80000000U) == 0U;} int host1x_syncpt_init(struct host1x *host){	struct host1x_syncpt_base *bases;	struct host1x_syncpt *syncpt;	unsigned int i; 	syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),			      GFP_KERNEL);	if (!syncpt)		return -ENOMEM; 	bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),			     GFP_KERNEL);	if (!bases)		return -ENOMEM; 	for (i = 0; i < host->info->nb_pts; i++) {		syncpt[i].id = i;		syncpt[i].host = host;	} 	for (i = 0; i < host->info->nb_bases; i++)		bases[i].id = i; 	mutex_init(&host->syncpt_mutex);	host->syncpt = syncpt;	host->bases = bases; 	/* Allocate sync point to use for clearing waits for expired fences */	host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");	if (!host->nop_sp)		return -ENOMEM; 	if (host->info->reserve_vblank_syncpts) {		kref_init(&host->syncpt[26].ref);		kref_init(&host->syncpt[27].ref);	} 	return 0;} /** * host1x_syncpt_request() - request a syncpoint * @client: client requesting the syncpoint * @flags: flags * * host1x client drivers can use this function to allocate a syncpoint for * subsequent use. A syncpoint returned by this function will be reserved for * use by the client exclusively. When no longer using a syncpoint, a host1x * client driver needs to release it using host1x_syncpt_put(). */struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,					    unsigned long flags){	struct host1x *host = dev_get_drvdata(client->host->parent); 	return host1x_syncpt_alloc(host, flags, dev_name(client->dev));}EXPORT_SYMBOL(host1x_syncpt_request); static void syncpt_release(struct kref *ref){	struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref); 	atomic_set(&sp->max_val, host1x_syncpt_read(sp)); 	sp->locked = false; 	host1x_syncpt_base_free(sp->base);	kfree(sp->name);	sp->base = NULL;	sp->name = NULL;	sp->client_managed = false; 	mutex_unlock(&sp->host->syncpt_mutex);} /** * host1x_syncpt_put() - free a requested syncpoint * @sp: host1x syncpoint * * Release a syncpoint previously allocated using host1x_syncpt_request(). A * host1x client driver should call this when the syncpoint is no longer in * use. */void host1x_syncpt_put(struct host1x_syncpt *sp){	if (!sp)		return; 	kref_put_mutex(&sp->ref, syncpt_release, &sp->host->syncpt_mutex);}EXPORT_SYMBOL(host1x_syncpt_put); void host1x_syncpt_deinit(struct host1x *host){	struct host1x_syncpt *sp = host->syncpt;	unsigned int i; 	for (i = 0; i < host->info->nb_pts; i++, sp++)		kfree(sp->name);} /** * host1x_syncpt_read_max() - read maximum syncpoint value * @sp: host1x syncpoint * * The maximum syncpoint value indicates how many operations there are in * queue, either in channel or in a software thread. */u32 host1x_syncpt_read_max(struct host1x_syncpt *sp){	smp_rmb(); 	return (u32)atomic_read(&sp->max_val);}EXPORT_SYMBOL(host1x_syncpt_read_max); /** * host1x_syncpt_read_min() - read minimum syncpoint value * @sp: host1x syncpoint * * The minimum syncpoint value is a shadow of the current sync point value in * hardware. */u32 host1x_syncpt_read_min(struct host1x_syncpt *sp){	smp_rmb(); 	return (u32)atomic_read(&sp->min_val);}EXPORT_SYMBOL(host1x_syncpt_read_min); /** * host1x_syncpt_read() - read the current syncpoint value * @sp: host1x syncpoint */u32 host1x_syncpt_read(struct host1x_syncpt *sp){	return host1x_syncpt_load(sp);}EXPORT_SYMBOL(host1x_syncpt_read); unsigned int host1x_syncpt_nb_pts(struct host1x *host){	return host->info->nb_pts;} unsigned int host1x_syncpt_nb_bases(struct host1x *host){	return host->info->nb_bases;} unsigned int host1x_syncpt_nb_mlocks(struct host1x *host){	return host->info->nb_mlocks;} /** * host1x_syncpt_get_by_id() - obtain a syncpoint by ID * @host: host1x controller * @id: syncpoint ID */struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,					      unsigned int id){	if (id >= host->info->nb_pts)		return NULL; 	if (kref_get_unless_zero(&host->syncpt[id].ref))		return &host->syncpt[id];	else		return NULL;}EXPORT_SYMBOL(host1x_syncpt_get_by_id); /** * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't * 	increase the refcount. * @host: host1x controller * @id: syncpoint ID */struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,						    unsigned int id){	if (id >= host->info->nb_pts)		return NULL; 	return &host->syncpt[id];}EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref); /** * host1x_syncpt_get() - increment syncpoint refcount * @sp: syncpoint */struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp){	kref_get(&sp->ref); 	return sp;}EXPORT_SYMBOL(host1x_syncpt_get); /** * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint * @sp: host1x syncpoint */struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp){	return sp ? sp->base : NULL;

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