/* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* vi: set ts=8 sw=8 sts=8: */
/*************************************************************************/ /*!
@File
@Title          PowerVR Linux fence interface
@Codingstyle    LinuxKernel
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@License        MIT

The contents of this file are subject to the MIT license as set out below.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

This License is also included in this distribution in the file called
"MIT-COPYING".

EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/ /**************************************************************************/

#if !defined(__PVR_FENCE_H__)
#define __PVR_FENCE_H__

#include <linux/version.h>

#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0))
static inline void pvr_fence_cleanup(void)
{
}
#else
#include "pvr_linux_fence.h"
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/completion.h>

struct _SYNC_CHECKPOINT_CONTEXT;
struct _SYNC_CHECKPOINT;

/**
 * pvr_fence_context - PVR fence context used to create and manage PVR fences
 * @lock: protects the context and fences created on the context
 * @name: fence context name (used for debugging)
 * @dbg_request_handle: handle for callback used to dump debug data
 * @sync_checkpoint_context: context used to create services sync checkpoints
 * @fence_context: fence context with which to associate fences
 * @fence_seqno: sequence number to use for the next fence
 * @fence_wq: work queue for signalled fence work
 * @check_status_work: work item used to inform services when a foreign fence
 * has signalled
 * @cmd_complete_handle: handle for callback used to signal fences when fence
 * syncs are met
 * @list_lock: protects the active and active foreign lists
 * @signal_list: list of fences waiting to be signalled
 * @fence_list: list of fences (used for debugging)
 * @deferred_free_list: list of fences that we will free when we are no longer
 * holding spinlocks.  The frees get implemented when an update fence is
 * signalled or the context is freed.
 */
struct pvr_fence_context {
	spinlock_t lock;
	char name[32];
	void *dbg_request_handle;

	struct _SYNC_CHECKPOINT_CONTEXT *sync_checkpoint_context;
	u64 fence_context;
	atomic_t fence_seqno;

	struct workqueue_struct *fence_wq;
	struct work_struct check_status_work;

	void *cmd_complete_handle;

	spinlock_t list_lock;
	struct list_head signal_list;
	struct list_head fence_list;
	struct list_head deferred_free_list;

	struct kref kref;
	struct delayed_work destroy_work;
	unsigned int destroy_retries_left;
	unsigned int destroy_delay_ms;
	struct completion *global_complete;
};

/**
 * pvr_fence - PVR fence that represents both native and foreign fences
 * @base: fence structure
 * @fctx: fence context on which this fence was created
 * @name: fence name (used for debugging)
 * @fence: pointer to base fence structure or foreign fence
 * @sync_checkpoint: services sync checkpoint used by hardware
 * @fence_head: entry on the context fence and deferred free list
 * @signal_head: entry on the context signal list
 * @cb: foreign fence callback to set the sync to signalled
 */
struct pvr_fence {
	struct dma_fence base;
	struct pvr_fence_context *fctx;
	char name[32];

	struct dma_fence *fence;
	struct _SYNC_CHECKPOINT *sync_checkpoint;

	struct list_head fence_head;
	struct list_head signal_head;
	struct dma_fence_cb cb;
};

extern const struct dma_fence_ops pvr_fence_ops;
extern const struct dma_fence_ops pvr_fence_foreign_ops;

static inline bool is_our_fence(struct pvr_fence_context *fctx,
				struct dma_fence *fence)
{
	return (fence->context == fctx->fence_context);
}

static inline bool is_pvr_fence(struct dma_fence *fence)
{
	return ((fence->ops == &pvr_fence_ops) ||
		(fence->ops == &pvr_fence_foreign_ops));
}

static inline struct pvr_fence *to_pvr_fence(struct dma_fence *fence)
{
	if (is_pvr_fence(fence))
		return container_of(fence, struct pvr_fence, base);

	return NULL;
}

struct pvr_fence_context *pvr_fence_context_create(void *dev_cookie,
						   struct workqueue_struct *fence_status_wq,
						   const char *name);
struct pvr_fence_context *pvr_global_fence_context_create(void *dev_cookie,
							  struct workqueue_struct *fence_status_wq,
							  const char *name);
void pvr_fence_context_destroy(struct pvr_fence_context *fctx);
void pvr_context_value_str(struct pvr_fence_context *fctx, char *str, int size);

struct pvr_fence *pvr_fence_create(struct pvr_fence_context *fctx,
				   int timeline_fd, const char *name);
struct pvr_fence *pvr_fence_create_from_fence(struct pvr_fence_context *fctx,
					      struct dma_fence *fence,
					      const char *name);
void pvr_fence_destroy(struct pvr_fence *pvr_fence);
int pvr_fence_sw_signal(struct pvr_fence *pvr_fence);
int pvr_fence_sw_error(struct pvr_fence *pvr_fence);

int pvr_fence_get_checkpoints(struct pvr_fence **pvr_fences, u32 nr_fences,
			      struct _SYNC_CHECKPOINT **fence_checkpoints);
struct _SYNC_CHECKPOINT *pvr_fence_get_checkpoint(struct pvr_fence *update_fence);

void pvr_fence_context_signal_fences_nohw(void *data);

u32 pvr_fence_dump_info_on_stalled_ufos(struct pvr_fence_context *fctx,
                                        u32 nr_ufos,
                                        u32 *vaddrs);

static inline void pvr_fence_cleanup(void)
{
	/*
	 * Ensure any outstanding work needed to destroy PVR fence
	 * contexts has completed, by flushing the global workqueue.
	 */
	flush_scheduled_work();
}

#if defined(PVR_FENCE_DEBUG)
#define PVR_FENCE_CTX_TRACE(c, fmt, ...)                                   \
	do {                                                               \
		struct pvr_fence_context *__fctx = (c);                    \
		pr_err("c %llu: (PVR) " fmt, (u64) __fctx->fence_context,  \
		       ## __VA_ARGS__);                                    \
	} while (0)
#else
#define PVR_FENCE_CTX_TRACE(c, fmt, ...)
#endif

#define PVR_FENCE_CTX_WARN(c, fmt, ...)                                    \
	do {                                                               \
		struct pvr_fence_context *__fctx = (c);                    \
		pr_warn("c %llu: (PVR) " fmt, (u64) __fctx->fence_context, \
			## __VA_ARGS__);                                   \
	} while (0)

#define PVR_FENCE_CTX_ERR(c, fmt, ...)                                     \
	do {                                                               \
		struct pvr_fence_context *__fctx = (c);                    \
		pr_err("c %llu: (PVR) " fmt, (u64) __fctx->fence_context,  \
		       ## __VA_ARGS__);                                    \
	} while (0)

#if defined(PVR_FENCE_DEBUG)
#define PVR_FENCE_TRACE(f, fmt, ...)                                       \
	DMA_FENCE_ERR(f, "(PVR) " fmt, ## __VA_ARGS__)
#else
#define PVR_FENCE_TRACE(f, fmt, ...)
#endif

#define PVR_FENCE_WARN(f, fmt, ...)                                        \
	DMA_FENCE_WARN(f, "(PVR) " fmt, ## __VA_ARGS__)

#define PVR_FENCE_ERR(f, fmt, ...)                                         \
	DMA_FENCE_ERR(f, "(PVR) " fmt, ## __VA_ARGS__)

#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)) */
#endif /* !defined(__PVR_FENCE_H__) */