#ifndef _UVC_QUEUE_H_ #define _UVC_QUEUE_H_ #ifdef __KERNEL__ #include #include #include #include /* Maximum frame size in bytes, for sanity checking. */ #define UVC_MAX_FRAME_SIZE (16*1024*1024) /* Maximum number of video buffers. */ #define UVC_MAX_VIDEO_BUFFERS 32 /* ------------------------------------------------------------------------ * Structures. */ enum uvc_buffer_state { UVC_BUF_STATE_IDLE = 0, UVC_BUF_STATE_QUEUED = 1, UVC_BUF_STATE_ACTIVE = 2, UVC_BUF_STATE_DONE = 3, UVC_BUF_STATE_ERROR = 4, }; struct uvc_buffer { struct vb2_v4l2_buffer buf; struct list_head queue; enum uvc_buffer_state state; void *mem; unsigned int length; unsigned int bytesused; }; #define UVC_QUEUE_DISCONNECTED (1 << 0) #define UVC_QUEUE_DROP_INCOMPLETE (1 << 1) #define UVC_QUEUE_PAUSED (1 << 2) struct uvc_video_queue { struct vb2_queue queue; unsigned int flags; __u32 sequence; unsigned int buf_used; spinlock_t irqlock; /* Protects flags and irqqueue */ struct list_head irqqueue; }; static inline int uvc_queue_streaming(struct uvc_video_queue *queue) { return vb2_is_streaming(&queue->queue); } int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, struct mutex *lock); void uvcg_free_buffers(struct uvc_video_queue *queue); int uvcg_alloc_buffers(struct uvc_video_queue *queue, struct v4l2_requestbuffers *rb); int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf); int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf); int uvcg_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf, int nonblocking); unsigned int uvcg_queue_poll(struct uvc_video_queue *queue, struct file *file, poll_table *wait); int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma); #ifndef CONFIG_MMU unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue, unsigned long pgoff); #endif /* CONFIG_MMU */ void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect); int uvcg_queue_enable(struct uvc_video_queue *queue, int enable); struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue, struct uvc_buffer *buf); struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue); #endif /* __KERNEL__ */ #endif /* _UVC_QUEUE_H_ */ type='hidden' name='h' value='nds-private-remove'/>
path: root/kernel/Kconfig.preempt
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authorThomas Gleixner <tglx@linutronix.de>2017-01-10 14:01:05 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-16 13:20:05 +0100
commit4205e4786d0b9fc3b4fec7b1910cf645a0468307 (patch)
tree685ccb486409197b936c785eb9d173c3edff45a1 /kernel/Kconfig.preempt
parent7e164ce4e8ecd7e9a58a83750bd3ee03125df154 (diff)
cpu/hotplug: Provide dynamic range for prepare stage
Mathieu reported that the LTTNG modules are broken as of 4.10-rc1 due to the removal of the cpu hotplug notifiers. Usually I don't care much about out of tree modules, but LTTNG is widely used in distros. There are two ways to solve that: 1) Reserve a hotplug state for LTTNG 2) Add a dynamic range for the prepare states. While #1 is the simplest solution, #2 is the proper one as we can convert in tree users, which do not care about ordering, to the dynamic range as well. Add a dynamic range which allows LTTNG to request states in the prepare stage. Reported-and-tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Sewior <bigeasy@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701101353010.3401@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/Kconfig.preempt')