gpu: host1x: Rewrite syncpoint interrupt handling
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@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen
Thierry Reding
Родитель
c24973ed79
Коммит
625d4ffb43
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@ -77,6 +77,7 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
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static void show_syncpts(struct host1x *m, struct output *o, bool show_all)
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{
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unsigned long irqflags;
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struct list_head *pos;
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unsigned int i;
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int err;
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@ -92,10 +93,10 @@ static void show_syncpts(struct host1x *m, struct output *o, bool show_all)
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u32 min = host1x_syncpt_load(m->syncpt + i);
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unsigned int waiters = 0;
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spin_lock(&m->syncpt[i].intr.lock);
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list_for_each(pos, &m->syncpt[i].intr.wait_head)
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spin_lock_irqsave(&m->syncpt[i].fences.lock, irqflags);
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list_for_each(pos, &m->syncpt[i].fences.list)
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waiters++;
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spin_unlock(&m->syncpt[i].intr.lock);
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spin_unlock_irqrestore(&m->syncpt[i].fences.lock, irqflags);
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if (!kref_read(&m->syncpt[i].ref))
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continue;
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@ -516,7 +516,7 @@ static int host1x_probe(struct platform_device *pdev)
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return PTR_ERR(host->regs);
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}
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syncpt_irq = platform_get_irq(pdev, 0);
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host->syncpt_irq = platform_get_irq(pdev, 0);
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if (syncpt_irq < 0)
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return syncpt_irq;
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@ -578,7 +578,7 @@ static int host1x_probe(struct platform_device *pdev)
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goto free_contexts;
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}
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err = host1x_intr_init(host, syncpt_irq);
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err = host1x_intr_init(host);
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if (err) {
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dev_err(&pdev->dev, "failed to initialize interrupts\n");
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goto deinit_syncpt;
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@ -74,8 +74,7 @@ struct host1x_syncpt_ops {
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};
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struct host1x_intr_ops {
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int (*init_host_sync)(struct host1x *host, u32 cpm,
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void (*syncpt_thresh_work)(struct work_struct *work));
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int (*init_host_sync)(struct host1x *host, u32 cpm);
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void (*set_syncpt_threshold)(
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struct host1x *host, unsigned int id, u32 thresh);
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void (*enable_syncpt_intr)(struct host1x *host, unsigned int id);
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@ -125,6 +124,7 @@ struct host1x {
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void __iomem *regs;
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void __iomem *hv_regs; /* hypervisor region */
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void __iomem *common_regs;
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int syncpt_irq;
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struct host1x_syncpt *syncpt;
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struct host1x_syncpt_base *bases;
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struct device *dev;
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@ -138,7 +138,6 @@ struct host1x {
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dma_addr_t iova_end;
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struct mutex intr_mutex;
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int intr_syncpt_irq;
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const struct host1x_syncpt_ops *syncpt_op;
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const struct host1x_intr_ops *intr_op;
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@ -216,10 +215,9 @@ static inline void host1x_hw_syncpt_enable_protection(struct host1x *host)
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return host->syncpt_op->enable_protection(host);
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}
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static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm,
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void (*syncpt_thresh_work)(struct work_struct *))
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static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm)
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{
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return host->intr_op->init_host_sync(host, cpm, syncpt_thresh_work);
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return host->intr_op->init_host_sync(host, cpm);
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}
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static inline void host1x_hw_intr_set_syncpt_threshold(struct host1x *host,
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@ -15,22 +15,6 @@
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#include "intr.h"
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#include "syncpt.h"
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static DEFINE_SPINLOCK(lock);
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struct host1x_syncpt_fence {
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struct dma_fence base;
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atomic_t signaling;
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struct host1x_syncpt *sp;
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u32 threshold;
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struct host1x_waitlist *waiter;
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void *waiter_ref;
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struct delayed_work timeout_work;
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};
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static const char *host1x_syncpt_fence_get_driver_name(struct dma_fence *f)
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{
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return "host1x";
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@ -49,11 +33,12 @@ static struct host1x_syncpt_fence *to_host1x_fence(struct dma_fence *f)
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static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
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{
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struct host1x_syncpt_fence *sf = to_host1x_fence(f);
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int err;
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if (host1x_syncpt_is_expired(sf->sp, sf->threshold))
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return false;
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/* One reference for interrupt path, one for timeout path. */
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dma_fence_get(f);
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dma_fence_get(f);
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/*
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@ -61,24 +46,13 @@ static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
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* reference to any fences for which 'enable_signaling' has been
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* called (and that have not been signalled).
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*
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* We provide a userspace API to create arbitrary syncpoint fences,
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* so we cannot normally guarantee that all fences get signalled.
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* We cannot (for now) normally guarantee that all fences get signalled.
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* As such, setup a timeout, so that long-lasting fences will get
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* reaped eventually.
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*/
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schedule_delayed_work(&sf->timeout_work, msecs_to_jiffies(30000));
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err = host1x_intr_add_action(sf->sp->host, sf->sp, sf->threshold,
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HOST1X_INTR_ACTION_SIGNAL_FENCE, f,
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sf->waiter, &sf->waiter_ref);
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if (err) {
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cancel_delayed_work_sync(&sf->timeout_work);
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dma_fence_put(f);
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return false;
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}
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/* intr framework takes ownership of waiter */
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sf->waiter = NULL;
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host1x_intr_add_fence_locked(sf->sp->host, sf);
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/*
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* The fence may get signalled at any time after the above call,
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@ -89,37 +63,32 @@ static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
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return true;
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}
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static void host1x_syncpt_fence_release(struct dma_fence *f)
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{
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struct host1x_syncpt_fence *sf = to_host1x_fence(f);
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if (sf->waiter)
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kfree(sf->waiter);
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dma_fence_free(f);
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}
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static const struct dma_fence_ops host1x_syncpt_fence_ops = {
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.get_driver_name = host1x_syncpt_fence_get_driver_name,
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.get_timeline_name = host1x_syncpt_fence_get_timeline_name,
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.enable_signaling = host1x_syncpt_fence_enable_signaling,
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.release = host1x_syncpt_fence_release,
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};
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void host1x_fence_signal(struct host1x_syncpt_fence *f)
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{
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if (atomic_xchg(&f->signaling, 1))
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if (atomic_xchg(&f->signaling, 1)) {
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/*
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* Already on timeout path, but we removed the fence before
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* timeout path could, so drop interrupt path reference.
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*/
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dma_fence_put(&f->base);
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return;
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}
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/*
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* Cancel pending timeout work - if it races, it will
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* not get 'f->signaling' and return.
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*/
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cancel_delayed_work_sync(&f->timeout_work);
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if (cancel_delayed_work(&f->timeout_work)) {
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/*
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* We know that the timeout path will not be entered.
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* Safe to drop the timeout path's reference now.
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*/
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dma_fence_put(&f->base);
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}
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host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, false);
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dma_fence_signal(&f->base);
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dma_fence_signal_locked(&f->base);
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dma_fence_put(&f->base);
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}
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@ -129,17 +98,24 @@ static void do_fence_timeout(struct work_struct *work)
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struct host1x_syncpt_fence *f =
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container_of(dwork, struct host1x_syncpt_fence, timeout_work);
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if (atomic_xchg(&f->signaling, 1))
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if (atomic_xchg(&f->signaling, 1)) {
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/* Already on interrupt path, drop timeout path reference. */
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dma_fence_put(&f->base);
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return;
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}
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/*
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* Cancel pending timeout work - if it races, it will
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* not get 'f->signaling' and return.
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*/
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host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, true);
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if (host1x_intr_remove_fence(f->sp->host, f)) {
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/*
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* Managed to remove fence from queue, so it's safe to drop
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* the interrupt path's reference.
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*/
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dma_fence_put(&f->base);
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}
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dma_fence_set_error(&f->base, -ETIMEDOUT);
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dma_fence_signal(&f->base);
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/* Drop timeout path reference. */
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dma_fence_put(&f->base);
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}
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@ -151,16 +127,10 @@ struct dma_fence *host1x_fence_create(struct host1x_syncpt *sp, u32 threshold)
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if (!fence)
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return ERR_PTR(-ENOMEM);
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fence->waiter = kzalloc(sizeof(*fence->waiter), GFP_KERNEL);
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if (!fence->waiter) {
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kfree(fence);
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return ERR_PTR(-ENOMEM);
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}
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fence->sp = sp;
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fence->threshold = threshold;
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dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &lock,
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dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &sp->fences.lock,
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dma_fence_context_alloc(1), 0);
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INIT_DELAYED_WORK(&fence->timeout_work, do_fence_timeout);
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@ -6,7 +6,23 @@
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#ifndef HOST1X_FENCE_H
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#define HOST1X_FENCE_H
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struct host1x_syncpt_fence;
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struct host1x_syncpt_fence {
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struct dma_fence base;
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atomic_t signaling;
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struct host1x_syncpt *sp;
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u32 threshold;
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struct delayed_work timeout_work;
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struct list_head list;
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};
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struct host1x_fence_list {
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spinlock_t lock;
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struct list_head list;
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};
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void host1x_fence_signal(struct host1x_syncpt_fence *fence);
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@ -13,23 +13,6 @@
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#include "../intr.h"
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#include "../dev.h"
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/*
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* Sync point threshold interrupt service function
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* Handles sync point threshold triggers, in interrupt context
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*/
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static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
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{
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unsigned int id = syncpt->id;
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struct host1x *host = syncpt->host;
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
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schedule_work(&syncpt->intr.work);
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}
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static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
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{
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struct host1x *host = dev_id;
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@ -39,17 +22,20 @@ static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
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for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
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reg = host1x_sync_readl(host,
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
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for_each_set_bit(id, ®, 32) {
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struct host1x_syncpt *syncpt =
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host->syncpt + (i * 32 + id);
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host1x_intr_syncpt_handle(syncpt);
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}
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host1x_sync_writel(host, reg,
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HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
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host1x_sync_writel(host, reg,
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
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for_each_set_bit(id, ®, 32)
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host1x_intr_handle_interrupt(host, i * 32 + id);
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}
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return IRQ_HANDLED;
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}
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static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
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static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
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{
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unsigned int i;
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@ -90,45 +76,38 @@ static void intr_hw_init(struct host1x *host, u32 cpm)
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}
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static int
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_host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
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void (*syncpt_thresh_work)(struct work_struct *))
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host1x_intr_init_host_sync(struct host1x *host, u32 cpm)
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{
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unsigned int i;
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int err;
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host1x_hw_intr_disable_all_syncpt_intrs(host);
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for (i = 0; i < host->info->nb_pts; i++)
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INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
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err = devm_request_irq(host->dev, host->intr_syncpt_irq,
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err = devm_request_irq(host->dev, host->syncpt_irq,
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syncpt_thresh_isr, IRQF_SHARED,
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"host1x_syncpt", host);
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if (err < 0) {
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WARN_ON(1);
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if (err < 0)
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return err;
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}
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intr_hw_init(host, cpm);
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return 0;
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}
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static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
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static void host1x_intr_set_syncpt_threshold(struct host1x *host,
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unsigned int id,
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u32 thresh)
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{
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host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
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}
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static void _host1x_intr_enable_syncpt_intr(struct host1x *host,
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static void host1x_intr_enable_syncpt_intr(struct host1x *host,
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unsigned int id)
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{
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host1x_sync_writel(host, BIT(id % 32),
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HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
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}
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static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
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static void host1x_intr_disable_syncpt_intr(struct host1x *host,
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unsigned int id)
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{
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host1x_sync_writel(host, BIT(id % 32),
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@ -137,23 +116,10 @@ static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
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HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
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}
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static int _host1x_free_syncpt_irq(struct host1x *host)
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{
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unsigned int i;
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devm_free_irq(host->dev, host->intr_syncpt_irq, host);
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for (i = 0; i < host->info->nb_pts; i++)
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cancel_work_sync(&host->syncpt[i].intr.work);
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return 0;
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}
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static const struct host1x_intr_ops host1x_intr_ops = {
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.init_host_sync = _host1x_intr_init_host_sync,
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.set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
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.enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
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.disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
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.disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
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.free_syncpt_irq = _host1x_free_syncpt_irq,
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.init_host_sync = host1x_intr_init_host_sync,
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.set_syncpt_threshold = host1x_intr_set_syncpt_threshold,
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.enable_syncpt_intr = host1x_intr_enable_syncpt_intr,
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.disable_syncpt_intr = host1x_intr_disable_syncpt_intr,
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.disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs,
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};
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@ -2,299 +2,113 @@
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/*
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* Tegra host1x Interrupt Management
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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* Copyright (c) 2010-2021, NVIDIA Corporation.
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*/
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <trace/events/host1x.h>
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||||
#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)
|
||||
static void host1x_intr_add_fence_to_list(struct host1x_fence_list *list,
|
||||
struct host1x_syncpt_fence *fence)
|
||||
{
|
||||
kfree(container_of(kref, struct host1x_waitlist, refcount));
|
||||
struct host1x_syncpt_fence *fence_in_list;
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
/* Add as first in list */
|
||||
list_add(&fence->list, &list->list);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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)
|
||||
static void host1x_intr_update_hw_state(struct host1x *host, struct host1x_syncpt *sp)
|
||||
{
|
||||
struct host1x_waitlist *pos;
|
||||
u32 thresh = waiter->thresh;
|
||||
struct host1x_syncpt_fence *fence;
|
||||
|
||||
list_for_each_entry_reverse(pos, queue, list)
|
||||
if ((s32)(pos->thresh - thresh) <= 0) {
|
||||
list_add(&waiter->list, &pos->list);
|
||||
return false;
|
||||
}
|
||||
if (!list_empty(&sp->fences.list)) {
|
||||
fence = list_first_entry(&sp->fences.list, struct host1x_syncpt_fence, list);
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
|
||||
void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence)
|
||||
{
|
||||
struct host1x_fence_list *fence_list = &fence->sp->fences;
|
||||
|
||||
INIT_LIST_HEAD(&fence->list);
|
||||
|
||||
host1x_intr_add_fence_to_list(fence_list, fence);
|
||||
host1x_intr_update_hw_state(host, fence->sp);
|
||||
}
|
||||
|
||||
bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence)
|
||||
{
|
||||
struct host1x_fence_list *fence_list = &fence->sp->fences;
|
||||
unsigned long irqflags;
|
||||
|
||||
spin_lock_irqsave(&fence_list->lock, irqflags);
|
||||
|
||||
if (list_empty(&fence->list)) {
|
||||
spin_unlock_irqrestore(&fence_list->lock, irqflags);
|
||||
return false;
|
||||
}
|
||||
|
||||
list_del_init(&fence->list);
|
||||
host1x_intr_update_hw_state(host, fence->sp);
|
||||
|
||||
spin_unlock_irqrestore(&fence_list->lock, irqflags);
|
||||
|
||||
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])
|
||||
void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id)
|
||||
{
|
||||
struct list_head *dest;
|
||||
struct host1x_waitlist *waiter, *next, *prev;
|
||||
struct host1x_syncpt *sp = &host->syncpt[id];
|
||||
struct host1x_syncpt_fence *fence, *tmp;
|
||||
unsigned int value;
|
||||
|
||||
list_for_each_entry_safe(waiter, next, head, list) {
|
||||
if ((s32)(waiter->thresh - sync) > 0)
|
||||
value = host1x_syncpt_load(sp);
|
||||
|
||||
spin_lock(&sp->fences.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;
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
/* 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);
|
||||
}
|
||||
|
||||
static void action_signal_fence(struct host1x_waitlist *waiter)
|
||||
{
|
||||
struct host1x_syncpt_fence *f = waiter->data;
|
||||
|
||||
host1x_fence_signal(f);
|
||||
}
|
||||
|
||||
typedef void (*action_handler)(struct host1x_waitlist *waiter);
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
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;
|
||||
}
|
||||
|
||||
/*
|
||||
* Sync point threshold interrupt service thread function
|
||||
* Handles sync point threshold triggers, in thread context
|
||||
*/
|
||||
|
||||
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));
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
int queue_was_empty;
|
||||
|
||||
if (waiter == NULL) {
|
||||
pr_warn("%s: NULL waiter\n", __func__);
|
||||
return -EINVAL;
|
||||
list_del_init(&fence->list);
|
||||
host1x_fence_signal(fence);
|
||||
}
|
||||
|
||||
/* 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;
|
||||
/* Re-enable interrupt if necessary */
|
||||
host1x_intr_update_hw_state(host, sp);
|
||||
|
||||
spin_lock(&syncpt->intr.lock);
|
||||
|
||||
queue_was_empty = list_empty(&syncpt->intr.wait_head);
|
||||
|
||||
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 (ref)
|
||||
*ref = waiter;
|
||||
|
||||
spin_unlock(&syncpt->intr.lock);
|
||||
|
||||
return 0;
|
||||
spin_unlock(&sp->fences.lock);
|
||||
}
|
||||
|
||||
void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
|
||||
bool flush)
|
||||
{
|
||||
struct host1x_waitlist *waiter = ref;
|
||||
struct host1x_syncpt *syncpt;
|
||||
|
||||
atomic_cmpxchg(&waiter->state, WLS_PENDING, WLS_CANCELLED);
|
||||
|
||||
syncpt = host->syncpt + id;
|
||||
|
||||
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);
|
||||
|
||||
if (flush) {
|
||||
/* Wait until any concurrently executing handler has finished. */
|
||||
while (atomic_read(&waiter->state) != WLS_HANDLED)
|
||||
schedule();
|
||||
}
|
||||
|
||||
kref_put(&waiter->refcount, waiter_release);
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
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