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https://github.com/edk2-porting/linux-next.git
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ee2d64f5cc
A major rewrite of interrupt handling for incoming mailbox processing, to split the timing critical steps from the the deferrable steps as the sending XPU on the CX23418 will time out and overwrite our incoming mailboxes rather quickly. Setup a pool of work "order forms" for the irq handler to send jobs to the new work handler routine which uses the kernel default work queue to do the deferrable work. Started optimizing some of the cx18-io calls as they are now the low hanging fruit for recoving microseconds back from the timeline. Future optimizations will get rid of mmio read retries, mmio stats logging, and combine smaller functions in the irq path into the larger ones to save ~2 us each. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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* cx18 buffer queues
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*
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* Derived from ivtv-queue.h
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#define CX18_DMA_UNMAPPED ((u32) -1)
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/* cx18_buffer utility functions */
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static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
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struct cx18_buffer *buf)
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{
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pci_dma_sync_single_for_cpu(s->cx->dev, buf->dma_handle,
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s->buf_size, s->dma);
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}
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static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
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struct cx18_buffer *buf)
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{
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pci_dma_sync_single_for_device(s->cx->dev, buf->dma_handle,
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s->buf_size, s->dma);
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}
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void cx18_buf_swap(struct cx18_buffer *buf);
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/* cx18_queue utility functions */
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void cx18_queue_init(struct cx18_queue *q);
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void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
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struct cx18_queue *q);
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struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
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struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id,
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u32 bytesused);
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void cx18_flush_queues(struct cx18_stream *s);
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/* cx18_stream utility functions */
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int cx18_stream_alloc(struct cx18_stream *s);
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void cx18_stream_free(struct cx18_stream *s);
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