410 lines
8.7 KiB
C
410 lines
8.7 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/syscalls.h>
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#include <linux/moduleloader.h>
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#include <linux/atomic.h>
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#include <linux/sched/signal.h>
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#include <asm/mipsmtregs.h>
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#include <asm/mips_mt.h>
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#include <asm/processor.h>
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#include <asm/rtlx.h>
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#include <asm/setup.h>
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#include <asm/vpe.h>
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static int sp_stopping;
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struct rtlx_info *rtlx;
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struct chan_waitqueues channel_wqs[RTLX_CHANNELS];
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struct vpe_notifications rtlx_notify;
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void (*aprp_hook)(void) = NULL;
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EXPORT_SYMBOL(aprp_hook);
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static void __used dump_rtlx(void)
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{
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int i;
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pr_info("id 0x%lx state %d\n", rtlx->id, rtlx->state);
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for (i = 0; i < RTLX_CHANNELS; i++) {
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struct rtlx_channel *chan = &rtlx->channel[i];
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pr_info(" rt_state %d lx_state %d buffer_size %d\n",
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chan->rt_state, chan->lx_state, chan->buffer_size);
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pr_info(" rt_read %d rt_write %d\n",
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chan->rt_read, chan->rt_write);
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pr_info(" lx_read %d lx_write %d\n",
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chan->lx_read, chan->lx_write);
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pr_info(" rt_buffer <%s>\n", chan->rt_buffer);
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pr_info(" lx_buffer <%s>\n", chan->lx_buffer);
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}
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}
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/* call when we have the address of the shared structure from the SP side. */
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static int rtlx_init(struct rtlx_info *rtlxi)
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{
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if (rtlxi->id != RTLX_ID) {
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pr_err("no valid RTLX id at 0x%p 0x%lx\n", rtlxi, rtlxi->id);
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return -ENOEXEC;
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}
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rtlx = rtlxi;
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return 0;
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}
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/* notifications */
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void rtlx_starting(int vpe)
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{
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int i;
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sp_stopping = 0;
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/* force a reload of rtlx */
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rtlx = NULL;
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/* wake up any sleeping rtlx_open's */
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for (i = 0; i < RTLX_CHANNELS; i++)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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}
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void rtlx_stopping(int vpe)
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{
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int i;
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sp_stopping = 1;
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for (i = 0; i < RTLX_CHANNELS; i++)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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}
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int rtlx_open(int index, int can_sleep)
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{
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struct rtlx_info **p;
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struct rtlx_channel *chan;
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enum rtlx_state state;
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int ret = 0;
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if (index >= RTLX_CHANNELS) {
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pr_debug("rtlx_open index out of range\n");
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return -ENOSYS;
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}
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if (atomic_inc_return(&channel_wqs[index].in_open) > 1) {
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pr_debug("rtlx_open channel %d already opened\n", index);
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ret = -EBUSY;
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goto out_fail;
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}
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if (rtlx == NULL) {
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p = vpe_get_shared(aprp_cpu_index());
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if (p == NULL) {
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if (can_sleep) {
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ret = __wait_event_interruptible(
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channel_wqs[index].lx_queue,
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(p = vpe_get_shared(aprp_cpu_index())));
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if (ret)
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goto out_fail;
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} else {
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pr_debug("No SP program loaded, and device opened with O_NONBLOCK\n");
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ret = -ENOSYS;
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goto out_fail;
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}
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}
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smp_rmb();
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if (*p == NULL) {
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if (can_sleep) {
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DEFINE_WAIT(wait);
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for (;;) {
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prepare_to_wait(
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&channel_wqs[index].lx_queue,
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&wait, TASK_INTERRUPTIBLE);
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smp_rmb();
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if (*p != NULL)
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break;
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if (!signal_pending(current)) {
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schedule();
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continue;
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}
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ret = -ERESTARTSYS;
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goto out_fail;
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}
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finish_wait(&channel_wqs[index].lx_queue,
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&wait);
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} else {
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pr_err(" *vpe_get_shared is NULL. Has an SP program been loaded?\n");
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ret = -ENOSYS;
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goto out_fail;
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}
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}
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if ((unsigned int)*p < KSEG0) {
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pr_warn("vpe_get_shared returned an invalid pointer maybe an error code %d\n",
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(int)*p);
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ret = -ENOSYS;
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goto out_fail;
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}
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ret = rtlx_init(*p);
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if (ret < 0)
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goto out_ret;
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}
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chan = &rtlx->channel[index];
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state = xchg(&chan->lx_state, RTLX_STATE_OPENED);
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if (state == RTLX_STATE_OPENED) {
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ret = -EBUSY;
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goto out_fail;
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}
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out_fail:
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smp_mb();
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atomic_dec(&channel_wqs[index].in_open);
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smp_mb();
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out_ret:
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return ret;
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}
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int rtlx_release(int index)
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{
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if (rtlx == NULL) {
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pr_err("rtlx_release() with null rtlx\n");
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return 0;
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}
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rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
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return 0;
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}
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unsigned int rtlx_read_poll(int index, int can_sleep)
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{
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struct rtlx_channel *chan;
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if (rtlx == NULL)
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return 0;
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chan = &rtlx->channel[index];
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/* data available to read? */
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if (chan->lx_read == chan->lx_write) {
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if (can_sleep) {
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int ret = __wait_event_interruptible(
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channel_wqs[index].lx_queue,
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(chan->lx_read != chan->lx_write) ||
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sp_stopping);
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if (ret)
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return ret;
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if (sp_stopping)
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return 0;
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} else
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return 0;
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}
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return (chan->lx_write + chan->buffer_size - chan->lx_read)
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% chan->buffer_size;
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}
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static inline int write_spacefree(int read, int write, int size)
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{
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if (read == write) {
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/*
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* Never fill the buffer completely, so indexes are always
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* equal if empty and only empty, or !equal if data available
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*/
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return size - 1;
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}
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return ((read + size - write) % size) - 1;
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}
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unsigned int rtlx_write_poll(int index)
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{
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struct rtlx_channel *chan = &rtlx->channel[index];
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return write_spacefree(chan->rt_read, chan->rt_write,
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chan->buffer_size);
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}
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ssize_t rtlx_read(int index, void __user *buff, size_t count)
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{
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size_t lx_write, fl = 0L;
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struct rtlx_channel *lx;
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unsigned long failed;
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if (rtlx == NULL)
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return -ENOSYS;
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lx = &rtlx->channel[index];
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mutex_lock(&channel_wqs[index].mutex);
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smp_rmb();
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lx_write = lx->lx_write;
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/* find out how much in total */
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count = min(count,
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(size_t)(lx_write + lx->buffer_size - lx->lx_read)
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% lx->buffer_size);
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/* then how much from the read pointer onwards */
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fl = min(count, (size_t)lx->buffer_size - lx->lx_read);
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failed = copy_to_user(buff, lx->lx_buffer + lx->lx_read, fl);
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if (failed)
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goto out;
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/* and if there is anything left at the beginning of the buffer */
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if (count - fl)
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failed = copy_to_user(buff + fl, lx->lx_buffer, count - fl);
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out:
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count -= failed;
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smp_wmb();
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lx->lx_read = (lx->lx_read + count) % lx->buffer_size;
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smp_wmb();
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mutex_unlock(&channel_wqs[index].mutex);
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return count;
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}
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ssize_t rtlx_write(int index, const void __user *buffer, size_t count)
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{
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struct rtlx_channel *rt;
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unsigned long failed;
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size_t rt_read;
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size_t fl;
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if (rtlx == NULL)
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return -ENOSYS;
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rt = &rtlx->channel[index];
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mutex_lock(&channel_wqs[index].mutex);
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smp_rmb();
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rt_read = rt->rt_read;
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/* total number of bytes to copy */
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count = min_t(size_t, count, write_spacefree(rt_read, rt->rt_write,
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rt->buffer_size));
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/* first bit from write pointer to the end of the buffer, or count */
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fl = min(count, (size_t) rt->buffer_size - rt->rt_write);
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failed = copy_from_user(rt->rt_buffer + rt->rt_write, buffer, fl);
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if (failed)
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goto out;
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/* if there's any left copy to the beginning of the buffer */
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if (count - fl)
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failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
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out:
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count -= failed;
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smp_wmb();
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rt->rt_write = (rt->rt_write + count) % rt->buffer_size;
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smp_wmb();
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mutex_unlock(&channel_wqs[index].mutex);
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_interrupt_sp();
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return count;
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}
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static int file_open(struct inode *inode, struct file *filp)
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{
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return rtlx_open(iminor(inode), (filp->f_flags & O_NONBLOCK) ? 0 : 1);
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}
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static int file_release(struct inode *inode, struct file *filp)
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{
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return rtlx_release(iminor(inode));
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}
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static __poll_t file_poll(struct file *file, poll_table *wait)
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{
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int minor = iminor(file_inode(file));
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__poll_t mask = 0;
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poll_wait(file, &channel_wqs[minor].rt_queue, wait);
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poll_wait(file, &channel_wqs[minor].lx_queue, wait);
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if (rtlx == NULL)
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return 0;
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/* data available to read? */
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if (rtlx_read_poll(minor, 0))
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mask |= EPOLLIN | EPOLLRDNORM;
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/* space to write */
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if (rtlx_write_poll(minor))
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mask |= EPOLLOUT | EPOLLWRNORM;
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return mask;
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}
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static ssize_t file_read(struct file *file, char __user *buffer, size_t count,
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loff_t *ppos)
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{
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int minor = iminor(file_inode(file));
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/* data available? */
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if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1))
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return 0; /* -EAGAIN makes 'cat' whine */
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return rtlx_read(minor, buffer, count);
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}
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static ssize_t file_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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int minor = iminor(file_inode(file));
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/* any space left... */
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if (!rtlx_write_poll(minor)) {
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int ret;
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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ret = __wait_event_interruptible(channel_wqs[minor].rt_queue,
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rtlx_write_poll(minor));
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if (ret)
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return ret;
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}
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return rtlx_write(minor, buffer, count);
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}
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const struct file_operations rtlx_fops = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.open = file_open,
|
||
|
|
.release = file_release,
|
||
|
|
.write = file_write,
|
||
|
|
.read = file_read,
|
||
|
|
.poll = file_poll,
|
||
|
|
.llseek = noop_llseek,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_init(rtlx_module_init);
|
||
|
|
module_exit(rtlx_module_exit);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("MIPS RTLX");
|
||
|
|
MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
|
||
|
|
MODULE_LICENSE("GPL");
|