From: Mikko Perttunen <mperttunen@xxxxxxxxxx> Move from the old, complex intr handling code to a new implementation based on dma_fences. While there is a fair bit of churn to get there, the new implementation is much simpler and likely faster as well due to allowing signaling directly from interrupt context. Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx> --- drivers/gpu/host1x/debug.c | 7 +- drivers/gpu/host1x/dev.c | 4 +- drivers/gpu/host1x/dev.h | 10 +- drivers/gpu/host1x/fence.c | 96 ++++----- drivers/gpu/host1x/fence.h | 18 +- drivers/gpu/host1x/hw/intr_hw.c | 74 ++----- drivers/gpu/host1x/intr.c | 334 ++++++-------------------------- drivers/gpu/host1x/intr.h | 83 +------- drivers/gpu/host1x/syncpt.h | 3 +- 9 files changed, 149 insertions(+), 480 deletions(-) diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c index 6649b04b7131..a18cc8d8caf5 100644 --- a/drivers/gpu/host1x/debug.c +++ b/drivers/gpu/host1x/debug.c @@ -77,6 +77,7 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo) static void show_syncpts(struct host1x *m, struct output *o, bool show_all) { + unsigned long irqflags; struct list_head *pos; unsigned int i; int err; @@ -92,10 +93,10 @@ static void show_syncpts(struct host1x *m, struct output *o, bool show_all) u32 min = host1x_syncpt_load(m->syncpt + i); unsigned int waiters = 0; - spin_lock(&m->syncpt[i].intr.lock); - list_for_each(pos, &m->syncpt[i].intr.wait_head) + spin_lock_irqsave(&m->syncpt[i].fences.lock, irqflags); + list_for_each(pos, &m->syncpt[i].fences.list) waiters++; - spin_unlock(&m->syncpt[i].intr.lock); + spin_unlock_irqrestore(&m->syncpt[i].fences.lock, irqflags); if (!kref_read(&m->syncpt[i].ref)) continue; diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index f31039aca03c..4872d183d860 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -516,7 +516,7 @@ static int host1x_probe(struct platform_device *pdev) return PTR_ERR(host->regs); } - syncpt_irq = platform_get_irq(pdev, 0); + host->syncpt_irq = platform_get_irq(pdev, 0); if (syncpt_irq < 0) return syncpt_irq; @@ -578,7 +578,7 @@ static int host1x_probe(struct platform_device *pdev) goto free_contexts; } - err = host1x_intr_init(host, syncpt_irq); + err = host1x_intr_init(host); if (err) { dev_err(&pdev->dev, "failed to initialize interrupts\n"); goto deinit_syncpt; diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h index 920e5548cfbc..75de50fe03d0 100644 --- a/drivers/gpu/host1x/dev.h +++ b/drivers/gpu/host1x/dev.h @@ -74,8 +74,7 @@ struct host1x_syncpt_ops { }; struct host1x_intr_ops { - int (*init_host_sync)(struct host1x *host, u32 cpm, - void (*syncpt_thresh_work)(struct work_struct *work)); + int (*init_host_sync)(struct host1x *host, u32 cpm); void (*set_syncpt_threshold)( struct host1x *host, unsigned int id, u32 thresh); void (*enable_syncpt_intr)(struct host1x *host, unsigned int id); @@ -125,6 +124,7 @@ struct host1x { void __iomem *regs; void __iomem *hv_regs; /* hypervisor region */ void __iomem *common_regs; + int syncpt_irq; struct host1x_syncpt *syncpt; struct host1x_syncpt_base *bases; struct device *dev; @@ -138,7 +138,6 @@ struct host1x { dma_addr_t iova_end; struct mutex intr_mutex; - int intr_syncpt_irq; const struct host1x_syncpt_ops *syncpt_op; const struct host1x_intr_ops *intr_op; @@ -216,10 +215,9 @@ static inline void host1x_hw_syncpt_enable_protection(struct host1x *host) return host->syncpt_op->enable_protection(host); } -static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm, - void (*syncpt_thresh_work)(struct work_struct *)) +static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm) { - return host->intr_op->init_host_sync(host, cpm, syncpt_thresh_work); + return host->intr_op->init_host_sync(host, cpm); } static inline void host1x_hw_intr_set_syncpt_threshold(struct host1x *host, diff --git a/drivers/gpu/host1x/fence.c b/drivers/gpu/host1x/fence.c index df428bcbae69..df5b56692d2c 100644 --- a/drivers/gpu/host1x/fence.c +++ b/drivers/gpu/host1x/fence.c @@ -15,22 +15,6 @@ #include "intr.h" #include "syncpt.h" -static DEFINE_SPINLOCK(lock); - -struct host1x_syncpt_fence { - struct dma_fence base; - - atomic_t signaling; - - struct host1x_syncpt *sp; - u32 threshold; - - struct host1x_waitlist *waiter; - void *waiter_ref; - - struct delayed_work timeout_work; -}; - static const char *host1x_syncpt_fence_get_driver_name(struct dma_fence *f) { return "host1x"; @@ -49,11 +33,12 @@ static struct host1x_syncpt_fence *to_host1x_fence(struct dma_fence *f) static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f) { struct host1x_syncpt_fence *sf = to_host1x_fence(f); - int err; if (host1x_syncpt_is_expired(sf->sp, sf->threshold)) return false; + /* One reference for interrupt path, one for timeout path. */ + dma_fence_get(f); dma_fence_get(f); /* @@ -61,24 +46,13 @@ static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f) * reference to any fences for which 'enable_signaling' has been * called (and that have not been signalled). * - * We provide a userspace API to create arbitrary syncpoint fences, - * so we cannot normally guarantee that all fences get signalled. + * We cannot (for now) normally guarantee that all fences get signalled. * As such, setup a timeout, so that long-lasting fences will get * reaped eventually. */ schedule_delayed_work(&sf->timeout_work, msecs_to_jiffies(30000)); - err = host1x_intr_add_action(sf->sp->host, sf->sp, sf->threshold, - HOST1X_INTR_ACTION_SIGNAL_FENCE, f, - sf->waiter, &sf->waiter_ref); - if (err) { - cancel_delayed_work_sync(&sf->timeout_work); - dma_fence_put(f); - return false; - } - - /* intr framework takes ownership of waiter */ - sf->waiter = NULL; + host1x_intr_add_fence_locked(sf->sp->host, sf); /* * The fence may get signalled at any time after the above call, @@ -89,37 +63,32 @@ static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f) return true; } -static void host1x_syncpt_fence_release(struct dma_fence *f) -{ - struct host1x_syncpt_fence *sf = to_host1x_fence(f); - - if (sf->waiter) - kfree(sf->waiter); - - dma_fence_free(f); -} - static const struct dma_fence_ops host1x_syncpt_fence_ops = { .get_driver_name = host1x_syncpt_fence_get_driver_name, .get_timeline_name = host1x_syncpt_fence_get_timeline_name, .enable_signaling = host1x_syncpt_fence_enable_signaling, - .release = host1x_syncpt_fence_release, }; void host1x_fence_signal(struct host1x_syncpt_fence *f) { - if (atomic_xchg(&f->signaling, 1)) + if (atomic_xchg(&f->signaling, 1)) { + /* + * Already on timeout path, but we removed the fence before + * timeout path could, so drop interrupt path reference. + */ + dma_fence_put(&f->base); return; + } - /* - * Cancel pending timeout work - if it races, it will - * not get 'f->signaling' and return. - */ - cancel_delayed_work_sync(&f->timeout_work); - - host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, false); + if (cancel_delayed_work(&f->timeout_work)) { + /* + * We know that the timeout path will not be entered. + * Safe to drop the timeout path's reference now. + */ + dma_fence_put(&f->base); + } - dma_fence_signal(&f->base); + dma_fence_signal_locked(&f->base); dma_fence_put(&f->base); } @@ -129,17 +98,24 @@ static void do_fence_timeout(struct work_struct *work) struct host1x_syncpt_fence *f = container_of(dwork, struct host1x_syncpt_fence, timeout_work); - if (atomic_xchg(&f->signaling, 1)) + if (atomic_xchg(&f->signaling, 1)) { + /* Already on interrupt path, drop timeout path reference. */ + dma_fence_put(&f->base); return; + } - /* - * Cancel pending timeout work - if it races, it will - * not get 'f->signaling' and return. - */ - host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, true); + if (host1x_intr_remove_fence(f->sp->host, f)) { + /* + * Managed to remove fence from queue, so it's safe to drop + * the interrupt path's reference. + */ + dma_fence_put(&f->base); + } dma_fence_set_error(&f->base, -ETIMEDOUT); dma_fence_signal(&f->base); + + /* Drop timeout path reference. */ dma_fence_put(&f->base); } @@ -151,16 +127,10 @@ struct dma_fence *host1x_fence_create(struct host1x_syncpt *sp, u32 threshold) if (!fence) return ERR_PTR(-ENOMEM); - fence->waiter = kzalloc(sizeof(*fence->waiter), GFP_KERNEL); - if (!fence->waiter) { - kfree(fence); - return ERR_PTR(-ENOMEM); - } - fence->sp = sp; fence->threshold = threshold; - dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &lock, + dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &sp->fences.lock, dma_fence_context_alloc(1), 0); INIT_DELAYED_WORK(&fence->timeout_work, do_fence_timeout); diff --git a/drivers/gpu/host1x/fence.h b/drivers/gpu/host1x/fence.h index 70c91de82f14..4352d046f92c 100644 --- a/drivers/gpu/host1x/fence.h +++ b/drivers/gpu/host1x/fence.h @@ -6,7 +6,23 @@ #ifndef HOST1X_FENCE_H #define HOST1X_FENCE_H -struct host1x_syncpt_fence; +struct host1x_syncpt_fence { + struct dma_fence base; + + atomic_t signaling; + + struct host1x_syncpt *sp; + u32 threshold; + + struct delayed_work timeout_work; + + struct list_head list; +}; + +struct host1x_fence_list { + spinlock_t lock; + struct list_head list; +}; void host1x_fence_signal(struct host1x_syncpt_fence *fence); diff --git a/drivers/gpu/host1x/hw/intr_hw.c b/drivers/gpu/host1x/hw/intr_hw.c index 9acccdb139e6..b915ef7d0348 100644 --- a/drivers/gpu/host1x/hw/intr_hw.c +++ b/drivers/gpu/host1x/hw/intr_hw.c @@ -13,23 +13,6 @@ #include "../intr.h" #include "../dev.h" -/* - * Sync point threshold interrupt service function - * Handles sync point threshold triggers, in interrupt context - */ -static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt) -{ - unsigned int id = syncpt->id; - struct host1x *host = syncpt->host; - - host1x_sync_writel(host, BIT(id % 32), - HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32)); - host1x_sync_writel(host, BIT(id % 32), - HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32)); - - schedule_work(&syncpt->intr.work); -} - static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id) { struct host1x *host = dev_id; @@ -39,17 +22,20 @@ static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id) for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) { reg = host1x_sync_readl(host, HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); - for_each_set_bit(id, ®, 32) { - struct host1x_syncpt *syncpt = - host->syncpt + (i * 32 + id); - host1x_intr_syncpt_handle(syncpt); - } + + host1x_sync_writel(host, reg, + HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i)); + host1x_sync_writel(host, reg, + HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); + + for_each_set_bit(id, ®, 32) + host1x_intr_handle_interrupt(host, i * 32 + id); } return IRQ_HANDLED; } -static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host) +static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host) { unsigned int i; @@ -90,45 +76,38 @@ static void intr_hw_init(struct host1x *host, u32 cpm) } static int -_host1x_intr_init_host_sync(struct host1x *host, u32 cpm, - void (*syncpt_thresh_work)(struct work_struct *)) +host1x_intr_init_host_sync(struct host1x *host, u32 cpm) { - unsigned int i; int err; host1x_hw_intr_disable_all_syncpt_intrs(host); - for (i = 0; i < host->info->nb_pts; i++) - INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work); - - err = devm_request_irq(host->dev, host->intr_syncpt_irq, + err = devm_request_irq(host->dev, host->syncpt_irq, syncpt_thresh_isr, IRQF_SHARED, "host1x_syncpt", host); - if (err < 0) { - WARN_ON(1); + if (err < 0) return err; - } intr_hw_init(host, cpm); return 0; } -static void _host1x_intr_set_syncpt_threshold(struct host1x *host, +static void host1x_intr_set_syncpt_threshold(struct host1x *host, unsigned int id, u32 thresh) { host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id)); } -static void _host1x_intr_enable_syncpt_intr(struct host1x *host, +static void host1x_intr_enable_syncpt_intr(struct host1x *host, unsigned int id) { host1x_sync_writel(host, BIT(id % 32), HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32)); } -static void _host1x_intr_disable_syncpt_intr(struct host1x *host, +static void host1x_intr_disable_syncpt_intr(struct host1x *host, unsigned int id) { host1x_sync_writel(host, BIT(id % 32), @@ -137,23 +116,10 @@ static void _host1x_intr_disable_syncpt_intr(struct host1x *host, HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32)); } -static int _host1x_free_syncpt_irq(struct host1x *host) -{ - unsigned int i; - - devm_free_irq(host->dev, host->intr_syncpt_irq, host); - - for (i = 0; i < host->info->nb_pts; i++) - cancel_work_sync(&host->syncpt[i].intr.work); - - return 0; -} - static const struct host1x_intr_ops host1x_intr_ops = { - .init_host_sync = _host1x_intr_init_host_sync, - .set_syncpt_threshold = _host1x_intr_set_syncpt_threshold, - .enable_syncpt_intr = _host1x_intr_enable_syncpt_intr, - .disable_syncpt_intr = _host1x_intr_disable_syncpt_intr, - .disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs, - .free_syncpt_irq = _host1x_free_syncpt_irq, + .init_host_sync = host1x_intr_init_host_sync, + .set_syncpt_threshold = host1x_intr_set_syncpt_threshold, + .enable_syncpt_intr = host1x_intr_enable_syncpt_intr, + .disable_syncpt_intr = host1x_intr_disable_syncpt_intr, + .disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs, }; diff --git a/drivers/gpu/host1x/intr.c b/drivers/gpu/host1x/intr.c index 965ba21818b1..995bfa980837 100644 --- a/drivers/gpu/host1x/intr.c +++ b/drivers/gpu/host1x/intr.c @@ -2,299 +2,113 @@ /* * Tegra host1x Interrupt Management * - * Copyright (c) 2010-2013, NVIDIA Corporation. + * Copyright (c) 2010-2021, NVIDIA Corporation. */ #include <linux/clk.h> -#include <linux/interrupt.h> -#include <linux/slab.h> -#include <linux/irq.h> -#include <trace/events/host1x.h> -#include "channel.h" #include "dev.h" #include "fence.h" #include "intr.h" -/* Wait list management */ - -enum waitlist_state { - WLS_PENDING, - WLS_REMOVED, - WLS_CANCELLED, - WLS_HANDLED -}; - -static void waiter_release(struct kref *kref) -{ - kfree(container_of(kref, struct host1x_waitlist, refcount)); -} - -/* - * add a waiter to a waiter queue, sorted by threshold - * returns true if it was added at the head of the queue - */ -static bool add_waiter_to_queue(struct host1x_waitlist *waiter, - struct list_head *queue) -{ - struct host1x_waitlist *pos; - u32 thresh = waiter->thresh; - - list_for_each_entry_reverse(pos, queue, list) - if ((s32)(pos->thresh - thresh) <= 0) { - list_add(&waiter->list, &pos->list); - return false; - } - - list_add(&waiter->list, queue); - return true; -} - -/* - * run through a waiter queue for a single sync point ID - * and gather all completed waiters into lists by actions - */ -static void remove_completed_waiters(struct list_head *head, u32 sync, - struct list_head completed[HOST1X_INTR_ACTION_COUNT]) +static void host1x_intr_add_fence_to_list(struct host1x_fence_list *list, + struct host1x_syncpt_fence *fence) { - struct list_head *dest; - struct host1x_waitlist *waiter, *next, *prev; - - list_for_each_entry_safe(waiter, next, head, list) { - if ((s32)(waiter->thresh - sync) > 0) - break; + struct host1x_syncpt_fence *fence_in_list; - dest = completed + waiter->action; - - /* consolidate submit cleanups */ - if (waiter->action == HOST1X_INTR_ACTION_SUBMIT_COMPLETE && - !list_empty(dest)) { - prev = list_entry(dest->prev, - struct host1x_waitlist, list); - if (prev->data == waiter->data) { - prev->count++; - dest = NULL; - } + list_for_each_entry_reverse(fence_in_list, &list->list, list) { + if ((s32)(fence_in_list->threshold - fence->threshold) <= 0) { + /* Fence in list is before us, we can insert here */ + list_add(&fence->list, &fence_in_list->list); + return; } - - /* PENDING->REMOVED or CANCELLED->HANDLED */ - if (atomic_inc_return(&waiter->state) == WLS_HANDLED || !dest) { - list_del(&waiter->list); - kref_put(&waiter->refcount, waiter_release); - } else - list_move_tail(&waiter->list, dest); } -} - -static void reset_threshold_interrupt(struct host1x *host, - struct list_head *head, - unsigned int id) -{ - u32 thresh = - list_first_entry(head, struct host1x_waitlist, list)->thresh; - - host1x_hw_intr_set_syncpt_threshold(host, id, thresh); - host1x_hw_intr_enable_syncpt_intr(host, id); -} - -static void action_submit_complete(struct host1x_waitlist *waiter) -{ - struct host1x_channel *channel = waiter->data; - - host1x_cdma_update(&channel->cdma); - - /* Add nr_completed to trace */ - trace_host1x_channel_submit_complete(dev_name(channel->dev), - waiter->count, waiter->thresh); -} -static void action_wakeup(struct host1x_waitlist *waiter) -{ - wait_queue_head_t *wq = waiter->data; - - wake_up(wq); -} - -static void action_wakeup_interruptible(struct host1x_waitlist *waiter) -{ - wait_queue_head_t *wq = waiter->data; - - wake_up_interruptible(wq); + /* Add as first in list */ + list_add(&fence->list, &list->list); } -static void action_signal_fence(struct host1x_waitlist *waiter) +static void host1x_intr_update_hw_state(struct host1x *host, struct host1x_syncpt *sp) { - struct host1x_syncpt_fence *f = waiter->data; - - host1x_fence_signal(f); -} + struct host1x_syncpt_fence *fence; -typedef void (*action_handler)(struct host1x_waitlist *waiter); + if (!list_empty(&sp->fences.list)) { + fence = list_first_entry(&sp->fences.list, struct host1x_syncpt_fence, list); -static const action_handler action_handlers[HOST1X_INTR_ACTION_COUNT] = { - action_submit_complete, - action_wakeup, - action_wakeup_interruptible, - action_signal_fence, -}; - -static void run_handlers(struct list_head completed[HOST1X_INTR_ACTION_COUNT]) -{ - struct list_head *head = completed; - unsigned int i; - - for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i, ++head) { - action_handler handler = action_handlers[i]; - struct host1x_waitlist *waiter, *next; - - list_for_each_entry_safe(waiter, next, head, list) { - list_del(&waiter->list); - handler(waiter); - WARN_ON(atomic_xchg(&waiter->state, WLS_HANDLED) != - WLS_REMOVED); - kref_put(&waiter->refcount, waiter_release); - } + host1x_hw_intr_set_syncpt_threshold(host, sp->id, fence->threshold); + host1x_hw_intr_enable_syncpt_intr(host, sp->id); + } else { + host1x_hw_intr_disable_syncpt_intr(host, sp->id); } } -/* - * Remove & handle all waiters that have completed for the given syncpt - */ -static int process_wait_list(struct host1x *host, - struct host1x_syncpt *syncpt, - u32 threshold) +void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence) { - struct list_head completed[HOST1X_INTR_ACTION_COUNT]; - unsigned int i; - int empty; - - for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i) - INIT_LIST_HEAD(completed + i); - - spin_lock(&syncpt->intr.lock); - - remove_completed_waiters(&syncpt->intr.wait_head, threshold, - completed); - - empty = list_empty(&syncpt->intr.wait_head); - if (empty) - host1x_hw_intr_disable_syncpt_intr(host, syncpt->id); - else - reset_threshold_interrupt(host, &syncpt->intr.wait_head, - syncpt->id); - - spin_unlock(&syncpt->intr.lock); - - run_handlers(completed); - - return empty; -} + struct host1x_fence_list *fence_list = &fence->sp->fences; -/* - * Sync point threshold interrupt service thread function - * Handles sync point threshold triggers, in thread context - */ + INIT_LIST_HEAD(&fence->list); -static void syncpt_thresh_work(struct work_struct *work) -{ - struct host1x_syncpt_intr *syncpt_intr = - container_of(work, struct host1x_syncpt_intr, work); - struct host1x_syncpt *syncpt = - container_of(syncpt_intr, struct host1x_syncpt, intr); - unsigned int id = syncpt->id; - struct host1x *host = syncpt->host; - - (void)process_wait_list(host, syncpt, - host1x_syncpt_load(host->syncpt + id)); + host1x_intr_add_fence_to_list(fence_list, fence); + host1x_intr_update_hw_state(host, fence->sp); } -int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt, - u32 thresh, enum host1x_intr_action action, - void *data, struct host1x_waitlist *waiter, - void **ref) +bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence) { - int queue_was_empty; - - if (waiter == NULL) { - pr_warn("%s: NULL waiter\n", __func__); - return -EINVAL; - } - - /* initialize a new waiter */ - INIT_LIST_HEAD(&waiter->list); - kref_init(&waiter->refcount); - if (ref) - kref_get(&waiter->refcount); - waiter->thresh = thresh; - waiter->action = action; - atomic_set(&waiter->state, WLS_PENDING); - waiter->data = data; - waiter->count = 1; - - spin_lock(&syncpt->intr.lock); + struct host1x_fence_list *fence_list = &fence->sp->fences; + unsigned long irqflags; - queue_was_empty = list_empty(&syncpt->intr.wait_head); + spin_lock_irqsave(&fence_list->lock, irqflags); - if (add_waiter_to_queue(waiter, &syncpt->intr.wait_head)) { - /* added at head of list - new threshold value */ - host1x_hw_intr_set_syncpt_threshold(host, syncpt->id, thresh); - - /* added as first waiter - enable interrupt */ - if (queue_was_empty) - host1x_hw_intr_enable_syncpt_intr(host, syncpt->id); + if (list_empty(&fence->list)) { + spin_unlock_irqrestore(&fence_list->lock, irqflags); + return false; } - if (ref) - *ref = waiter; + list_del_init(&fence->list); + host1x_intr_update_hw_state(host, fence->sp); - spin_unlock(&syncpt->intr.lock); + spin_unlock_irqrestore(&fence_list->lock, irqflags); - return 0; + return true; } -void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref, - bool flush) +void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id) { - struct host1x_waitlist *waiter = ref; - struct host1x_syncpt *syncpt; + struct host1x_syncpt *sp = &host->syncpt[id]; + struct host1x_syncpt_fence *fence, *tmp; + unsigned int value; - atomic_cmpxchg(&waiter->state, WLS_PENDING, WLS_CANCELLED); + value = host1x_syncpt_load(sp); - syncpt = host->syncpt + id; + spin_lock(&sp->fences.lock); - spin_lock(&syncpt->intr.lock); - if (atomic_cmpxchg(&waiter->state, WLS_CANCELLED, WLS_HANDLED) == - WLS_CANCELLED) { - list_del(&waiter->list); - kref_put(&waiter->refcount, waiter_release); - } - spin_unlock(&syncpt->intr.lock); + list_for_each_entry_safe(fence, tmp, &sp->fences.list, list) { + if (((value - fence->threshold) & 0x80000000U) != 0U) { + /* Fence is not yet expired, we are done */ + break; + } - if (flush) { - /* Wait until any concurrently executing handler has finished. */ - while (atomic_read(&waiter->state) != WLS_HANDLED) - schedule(); + list_del_init(&fence->list); + host1x_fence_signal(fence); } - kref_put(&waiter->refcount, waiter_release); + /* Re-enable interrupt if necessary */ + host1x_intr_update_hw_state(host, sp); + + spin_unlock(&sp->fences.lock); } -int host1x_intr_init(struct host1x *host, unsigned int irq_sync) +int host1x_intr_init(struct host1x *host) { unsigned int id; - u32 nb_pts = host1x_syncpt_nb_pts(host); mutex_init(&host->intr_mutex); - host->intr_syncpt_irq = irq_sync; - for (id = 0; id < nb_pts; ++id) { - struct host1x_syncpt *syncpt = host->syncpt + id; + for (id = 0; id < host1x_syncpt_nb_pts(host); ++id) { + struct host1x_syncpt *syncpt = &host->syncpt[id]; - spin_lock_init(&syncpt->intr.lock); - INIT_LIST_HEAD(&syncpt->intr.wait_head); - snprintf(syncpt->intr.thresh_irq_name, - sizeof(syncpt->intr.thresh_irq_name), - "host1x_sp_%02u", id); + spin_lock_init(&syncpt->fences.lock); + INIT_LIST_HEAD(&syncpt->fences.list); } return 0; @@ -310,8 +124,7 @@ void host1x_intr_start(struct host1x *host) int err; mutex_lock(&host->intr_mutex); - err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000), - syncpt_thresh_work); + err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000)); if (err) { mutex_unlock(&host->intr_mutex); return; @@ -321,36 +134,5 @@ void host1x_intr_start(struct host1x *host) void host1x_intr_stop(struct host1x *host) { - unsigned int id; - struct host1x_syncpt *syncpt = host->syncpt; - u32 nb_pts = host1x_syncpt_nb_pts(host); - - mutex_lock(&host->intr_mutex); - host1x_hw_intr_disable_all_syncpt_intrs(host); - - for (id = 0; id < nb_pts; ++id) { - struct host1x_waitlist *waiter, *next; - - list_for_each_entry_safe(waiter, next, - &syncpt[id].intr.wait_head, list) { - if (atomic_cmpxchg(&waiter->state, - WLS_CANCELLED, WLS_HANDLED) == WLS_CANCELLED) { - list_del(&waiter->list); - kref_put(&waiter->refcount, waiter_release); - } - } - - if (!list_empty(&syncpt[id].intr.wait_head)) { - /* output diagnostics */ - mutex_unlock(&host->intr_mutex); - pr_warn("%s cannot stop syncpt intr id=%u\n", - __func__, id); - return; - } - } - - host1x_hw_intr_free_syncpt_irq(host); - - mutex_unlock(&host->intr_mutex); } diff --git a/drivers/gpu/host1x/intr.h b/drivers/gpu/host1x/intr.h index e4c346099273..3b5610b525e5 100644 --- a/drivers/gpu/host1x/intr.h +++ b/drivers/gpu/host1x/intr.h @@ -2,87 +2,17 @@ /* * Tegra host1x Interrupt Management * - * Copyright (c) 2010-2013, NVIDIA Corporation. + * Copyright (c) 2010-2021, NVIDIA Corporation. */ #ifndef __HOST1X_INTR_H #define __HOST1X_INTR_H -#include <linux/interrupt.h> -#include <linux/workqueue.h> - -struct host1x_syncpt; struct host1x; - -enum host1x_intr_action { - /* - * Perform cleanup after a submit has completed. - * 'data' points to a channel - */ - HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0, - - /* - * Wake up a task. - * 'data' points to a wait_queue_head_t - */ - HOST1X_INTR_ACTION_WAKEUP, - - /* - * Wake up a interruptible task. - * 'data' points to a wait_queue_head_t - */ - HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE, - - HOST1X_INTR_ACTION_SIGNAL_FENCE, - - HOST1X_INTR_ACTION_COUNT -}; - -struct host1x_syncpt_intr { - spinlock_t lock; - struct list_head wait_head; - char thresh_irq_name[12]; - struct work_struct work; -}; - -struct host1x_waitlist { - struct list_head list; - struct kref refcount; - u32 thresh; - enum host1x_intr_action action; - atomic_t state; - void *data; - int count; -}; - -/* - * Schedule an action to be taken when a sync point reaches the given threshold. - * - * @id the sync point - * @thresh the threshold - * @action the action to take - * @data a pointer to extra data depending on action, see above - * @waiter waiter structure - assumes ownership - * @ref must be passed if cancellation is possible, else NULL - * - * This is a non-blocking api. - */ -int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt, - u32 thresh, enum host1x_intr_action action, - void *data, struct host1x_waitlist *waiter, - void **ref); - -/* - * Unreference an action submitted to host1x_intr_add_action(). - * You must call this if you passed non-NULL as ref. - * @ref the ref returned from host1x_intr_add_action() - * @flush wait until any pending handlers have completed before returning. - */ -void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref, - bool flush); +struct host1x_syncpt_fence; /* Initialize host1x sync point interrupt */ -int host1x_intr_init(struct host1x *host, unsigned int irq_sync); +int host1x_intr_init(struct host1x *host); /* Deinitialize host1x sync point interrupt */ void host1x_intr_deinit(struct host1x *host); @@ -93,5 +23,10 @@ void host1x_intr_start(struct host1x *host); /* Disable host1x sync point interrupt */ void host1x_intr_stop(struct host1x *host); -irqreturn_t host1x_syncpt_thresh_fn(void *dev_id); +void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id); + +void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence); + +bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence); + #endif diff --git a/drivers/gpu/host1x/syncpt.h b/drivers/gpu/host1x/syncpt.h index 95cd29b79d6d..4c3f3b2f0e9c 100644 --- a/drivers/gpu/host1x/syncpt.h +++ b/drivers/gpu/host1x/syncpt.h @@ -14,6 +14,7 @@ #include <linux/kref.h> #include <linux/sched.h> +#include "fence.h" #include "intr.h" struct host1x; @@ -39,7 +40,7 @@ struct host1x_syncpt { struct host1x_syncpt_base *base; /* interrupt data */ - struct host1x_syncpt_intr intr; + struct host1x_fence_list fences; /* * If a submission incrementing this syncpoint fails, lock it so that -- 2.39.0