forked from mirrors/linux
625d4ffb43
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>
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Tegra host1x Syncpoints
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*/
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#ifndef __HOST1X_SYNCPT_H
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#define __HOST1X_SYNCPT_H
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#include <linux/atomic.h>
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#include <linux/host1x.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/sched.h>
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#include "fence.h"
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#include "intr.h"
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struct host1x;
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/* Reserved for replacing an expired wait with a NOP */
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#define HOST1X_SYNCPT_RESERVED 0
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struct host1x_syncpt_base {
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unsigned int id;
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bool requested;
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};
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struct host1x_syncpt {
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struct kref ref;
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unsigned int id;
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atomic_t min_val;
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atomic_t max_val;
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u32 base_val;
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const char *name;
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bool client_managed;
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struct host1x *host;
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struct host1x_syncpt_base *base;
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/* interrupt data */
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struct host1x_fence_list fences;
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/*
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* If a submission incrementing this syncpoint fails, lock it so that
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* further submission cannot be made until application has handled the
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* failure.
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*/
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bool locked;
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};
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/* Initialize sync point array */
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int host1x_syncpt_init(struct host1x *host);
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/* Free sync point array */
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void host1x_syncpt_deinit(struct host1x *host);
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/* Return number of sync point supported. */
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unsigned int host1x_syncpt_nb_pts(struct host1x *host);
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/* Return number of wait bases supported. */
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unsigned int host1x_syncpt_nb_bases(struct host1x *host);
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/* Return number of mlocks supported. */
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unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
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/*
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* Check sync point sanity. If max is larger than min, there have too many
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* sync point increments.
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*
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* Client managed sync point are not tracked.
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* */
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static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
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{
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u32 max;
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if (sp->client_managed)
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return true;
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max = host1x_syncpt_read_max(sp);
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return (s32)(max - real) >= 0;
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}
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/* Return true if sync point is client managed. */
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static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
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{
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return sp->client_managed;
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}
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/*
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* Returns true if syncpoint min == max, which means that there are no
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* outstanding operations.
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*/
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static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
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{
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int min, max;
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smp_rmb();
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min = atomic_read(&sp->min_val);
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max = atomic_read(&sp->max_val);
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return (min == max);
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}
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/* Load current value from hardware to the shadow register. */
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u32 host1x_syncpt_load(struct host1x_syncpt *sp);
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/* Check if the given syncpoint value has already passed */
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bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
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/* Save host1x sync point state into shadow registers. */
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void host1x_syncpt_save(struct host1x *host);
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/* Reset host1x sync point state from shadow registers. */
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void host1x_syncpt_restore(struct host1x *host);
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/* Read current wait base value into shadow register and return it. */
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u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
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/* Indicate future operations by incrementing the sync point max. */
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u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
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/* Check if sync point id is valid. */
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static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
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{
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return sp->id < host1x_syncpt_nb_pts(sp->host);
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}
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static inline void host1x_syncpt_set_locked(struct host1x_syncpt *sp)
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{
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sp->locked = true;
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}
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#endif
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