205 lines
6.2 KiB
C
205 lines
6.2 KiB
C
/*
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*
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* (C) COPYRIGHT 2012-2017 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained
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* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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/**
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* @file mali_kbase_sync.h
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*
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* This file contains our internal "API" for explicit fences.
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* It hides the implementation details of the actual explicit fence mechanism
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* used (Android fences or sync file with DMA fences).
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*/
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#ifndef MALI_KBASE_SYNC_H
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#define MALI_KBASE_SYNC_H
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#include <linux/fdtable.h>
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#include <linux/syscalls.h>
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#ifdef CONFIG_SYNC
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#include <sync.h>
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#endif
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#ifdef CONFIG_SYNC_FILE
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#include "mali_kbase_fence_defs.h"
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#include <linux/sync_file.h>
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#endif
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#include "mali_kbase.h"
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/**
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* struct kbase_sync_fence_info - Information about a fence
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* @fence: Pointer to fence (type is void*, as underlaying struct can differ)
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* @name: The name given to this fence when it was created
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* @status: < 0 means error, 0 means active, 1 means signaled
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*
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* Use kbase_sync_fence_in_info_get() or kbase_sync_fence_out_info_get()
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* to get the information.
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*/
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struct kbase_sync_fence_info {
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void *fence;
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char name[32];
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int status;
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};
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/**
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* kbase_sync_fence_stream_create() - Create a stream object
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* @name: Name of stream (only used to ease debugging/visualization)
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* @out_fd: A file descriptor representing the created stream object
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*
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* Can map down to a timeline implementation in some implementations.
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* Exposed as a file descriptor.
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* Life-time controlled via the file descriptor:
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* - dup to add a ref
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* - close to remove a ref
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*
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* return: 0 on success, < 0 on error
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*/
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int kbase_sync_fence_stream_create(const char *name, int *const out_fd);
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/**
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* kbase_sync_fence_out_create Create an explicit output fence to specified atom
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* @katom: Atom to assign the new explicit fence to
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* @stream_fd: File descriptor for stream object to create fence on
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*
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* return: Valid file descriptor to fence or < 0 on error
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*/
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int kbase_sync_fence_out_create(struct kbase_jd_atom *katom, int stream_fd);
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/**
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* kbase_sync_fence_in_from_fd() Assigns an existing fence to specified atom
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* @katom: Atom to assign the existing explicit fence to
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* @fd: File descriptor to an existing fence
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*
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* Assigns an explicit input fence to atom.
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* This can later be waited for by calling @kbase_sync_fence_in_wait
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*
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* return: 0 on success, < 0 on error
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*/
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int kbase_sync_fence_in_from_fd(struct kbase_jd_atom *katom, int fd);
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/**
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* kbase_sync_fence_validate() - Validate a fd to be a valid fence
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* @fd: File descriptor to check
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*
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* This function is only usable to catch unintentional user errors early,
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* it does not stop malicious code changing the fd after this function returns.
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*
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* return 0: if fd is for a valid fence, < 0 if invalid
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*/
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int kbase_sync_fence_validate(int fd);
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/**
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* kbase_sync_fence_out_trigger - Signal explicit output fence attached on katom
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* @katom: Atom with an explicit fence to signal
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* @result: < 0 means signal with error, 0 >= indicates success
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*
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* Signal output fence attached on katom and remove the fence from the atom.
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*
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* return: The "next" event code for atom, typically JOB_CANCELLED or EVENT_DONE
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*/
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enum base_jd_event_code
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kbase_sync_fence_out_trigger(struct kbase_jd_atom *katom, int result);
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/**
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* kbase_sync_fence_in_wait() - Wait for explicit input fence to be signaled
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* @katom: Atom with explicit fence to wait for
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*
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* If the fence is already signaled, then 0 is returned, and the caller must
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* continue processing of the katom.
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*
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* If the fence isn't already signaled, then this kbase_sync framework will
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* take responsibility to continue the processing once the fence is signaled.
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*
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* return: 0 if already signaled, otherwise 1
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*/
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int kbase_sync_fence_in_wait(struct kbase_jd_atom *katom);
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/**
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* kbase_sync_fence_in_cancel_wait() - Cancel explicit input fence waits
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* @katom: Atom to cancel wait for
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*
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* This function is fully responsible for continuing processing of this atom
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* (remove_waiting_soft_job + finish_soft_job + jd_done + js_sched_all)
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*/
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void kbase_sync_fence_in_cancel_wait(struct kbase_jd_atom *katom);
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/**
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* kbase_sync_fence_in_remove() - Remove the input fence from the katom
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* @katom: Atom to remove explicit input fence for
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*
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* This will also release the corresponding reference.
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*/
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void kbase_sync_fence_in_remove(struct kbase_jd_atom *katom);
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/**
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* kbase_sync_fence_out_remove() - Remove the output fence from the katom
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* @katom: Atom to remove explicit output fence for
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*
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* This will also release the corresponding reference.
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*/
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void kbase_sync_fence_out_remove(struct kbase_jd_atom *katom);
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/**
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* kbase_sync_fence_close_fd() - Close a file descriptor representing a fence
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* @fd: File descriptor to close
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*/
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static inline void kbase_sync_fence_close_fd(int fd)
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{
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close_fd(fd);
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}
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/**
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* kbase_sync_fence_in_info_get() - Retrieves information about input fence
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* @katom: Atom to get fence information from
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* @info: Struct to be filled with fence information
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*
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* return: 0 on success, < 0 on error
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*/
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int kbase_sync_fence_in_info_get(struct kbase_jd_atom *katom,
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struct kbase_sync_fence_info *info);
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/**
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* kbase_sync_fence_out_info_get() - Retrieves information about output fence
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* @katom: Atom to get fence information from
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* @info: Struct to be filled with fence information
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*
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* return: 0 on success, < 0 on error
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*/
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int kbase_sync_fence_out_info_get(struct kbase_jd_atom *katom,
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struct kbase_sync_fence_info *info);
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/**
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* kbase_sync_status_string() - Get string matching @status
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* @status: Value of fence status.
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*
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* return: Pointer to string describing @status.
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*/
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const char *kbase_sync_status_string(int status);
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/*
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* Internal worker used to continue processing of atom.
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*/
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void kbase_sync_fence_wait_worker(struct work_struct *data);
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#ifdef CONFIG_MALI_FENCE_DEBUG
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/**
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* kbase_sync_fence_in_dump() Trigger a debug dump of atoms input fence state
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* @katom: Atom to trigger fence debug dump for
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*/
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void kbase_sync_fence_in_dump(struct kbase_jd_atom *katom);
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#endif
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#endif /* MALI_KBASE_SYNC_H */
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