93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
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/*
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* Copyright (C) 2016 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#ifndef GOLDFISH_PIPE_H
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#define GOLDFISH_PIPE_H
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/goldfish.h>
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#include <linux/dma-mapping.h>
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#include <linux/mm.h>
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#include <linux/acpi.h>
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/* Initialize the legacy version of the pipe device driver */
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int goldfish_pipe_device_init_v1(struct platform_device *pdev);
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/* Deinitialize the legacy version of the pipe device driver */
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void goldfish_pipe_device_deinit_v1(struct platform_device *pdev);
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/* Forward declarations for the device struct */
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struct goldfish_pipe;
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struct goldfish_pipe_device_buffers;
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/* The global driver data. Holds a reference to the i/o page used to
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* communicate with the emulator, and a wake queue for blocked tasks
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* waiting to be awoken.
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*/
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struct goldfish_pipe_dev {
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/*
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* Global device spinlock. Protects the following members:
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* - pipes, pipes_capacity
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* - [*pipes, *pipes + pipes_capacity) - array data
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* - first_signalled_pipe,
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* goldfish_pipe::prev_signalled,
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* goldfish_pipe::next_signalled,
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* goldfish_pipe::signalled_flags - all singnalled-related fields,
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* in all allocated pipes
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* - open_command_params - PIPE_CMD_OPEN-related buffers
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*
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* It looks like a lot of different fields, but the trick is that the only
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* operation that happens often is the signalled pipes array manipulation.
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* That's why it's OK for now to keep the rest of the fields under the same
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* lock. If we notice too much contention because of PIPE_CMD_OPEN,
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* then we should add a separate lock there.
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*/
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spinlock_t lock;
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/*
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* Array of the pipes of |pipes_capacity| elements,
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* indexed by goldfish_pipe::id
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*/
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struct goldfish_pipe **pipes;
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u32 pipes_capacity;
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/* Pointers to the buffers host uses for interaction with this driver */
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struct goldfish_pipe_dev_buffers *buffers;
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/* Head of a doubly linked list of signalled pipes */
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struct goldfish_pipe *first_signalled_pipe;
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/* Some device-specific data */
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int irq;
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int version;
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unsigned char __iomem *base;
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/* v1-specific access parameters */
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struct access_params *aps;
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};
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extern struct goldfish_pipe_dev pipe_dev[1];
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#endif /* GOLDFISH_PIPE_H */
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