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409 lines
8.7 KiB
409 lines
8.7 KiB
/* |
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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 ([email protected]) |
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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 = { |
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.owner = THIS_MODULE, |
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.open = file_open, |
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.release = file_release, |
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.write = file_write, |
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.read = file_read, |
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.poll = file_poll, |
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.llseek = noop_llseek, |
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}; |
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module_init(rtlx_module_init); |
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module_exit(rtlx_module_exit); |
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MODULE_DESCRIPTION("MIPS RTLX"); |
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MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); |
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MODULE_LICENSE("GPL");
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