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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/module.h>#include <linux/device.h>#include <linux/dma-fence.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){ 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 ((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;}EXPORT_SYMBOL(host1x_syncpt_get_base);
/** * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base * @base: host1x syncpoint wait base */u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base){ return base->id;}EXPORT_SYMBOL(host1x_syncpt_base_id);
static void do_nothing(struct kref *ref){}
/** * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint * available for allocation * * @client: host1x bus client * @syncpt_id: syncpoint ID to make available * * Makes VBLANK<i> syncpoint available for allocatation if it was * reserved at initialization time. This should be called by the display * driver after it has ensured that any VBLANK increment programming configured * by the boot chain has been disabled. */void host1x_syncpt_release_vblank_reservation(struct host1x_client *client, u32 syncpt_id){ struct host1x *host = dev_get_drvdata(client->host->parent);
if (!host->info->reserve_vblank_syncpts) return;
kref_put(&host->syncpt[syncpt_id].ref, do_nothing);}EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);