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* chnl_sm.c
*
* DSP-BIOS Bridge driver support functions for TI OMAP processors.
*
* Implements upper edge functions for Bridge driver channel module.
*
* Copyright (C) 2005-2006 Texas Instruments, Inc.
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* The lower edge functions must be implemented by the Bridge driver
* writer, and are declared in chnl_sm.h.
*
* Care is taken in this code to prevent simulataneous access to channel
* queues from
* 1. Threads.
* 2. io_dpc(), scheduled from the io_isr() as an event.
*
* This is done primarily by:
* - Semaphores.
* - state flags in the channel object; and
* - ensuring the IO_Dispatch() routine, which is called from both
* CHNL_AddIOReq() and the DPC(if implemented), is not re-entered.
*
* Channel Invariant:
* There is an important invariant condition which must be maintained per
* channel outside of bridge_chnl_get_ioc() and IO_Dispatch(), violation of
* which may cause timeouts and/or failure offunction sync_wait_on_event.
* This invariant condition is:
*
* list_empty(&pchnl->io_completions) ==> pchnl->sync_event is reset
* and
* !list_empty(&pchnl->io_completions) ==> pchnl->sync_event is set.
*/
#include <linux/types.h>
/* ----------------------------------- OS */
#include <dspbridge/host_os.h>
/* ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/dbdefs.h>
/* ----------------------------------- Trace & Debug */
#include <dspbridge/dbc.h>
/* ----------------------------------- OS Adaptation Layer */
#include <dspbridge/sync.h>
/* ----------------------------------- Bridge Driver */
#include <dspbridge/dspdefs.h>
#include <dspbridge/dspchnl.h>
#include "_tiomap.h"
/* ----------------------------------- Platform Manager */
#include <dspbridge/dev.h>
/* ----------------------------------- Others */
#include <dspbridge/io_sm.h>
/* ----------------------------------- Define for This */
#define USERMODE_ADDR PAGE_OFFSET
#define MAILBOX_IRQ INT_MAIL_MPU_IRQ
/* ----------------------------------- Function Prototypes */
static int create_chirp_list(struct list_head *list, u32 chirps);
static void free_chirp_list(struct list_head *list);
static int search_free_channel(struct chnl_mgr *chnl_mgr_obj,
u32 *chnl);
/*
* ======== bridge_chnl_add_io_req ========
* Enqueue an I/O request for data transfer on a channel to the DSP.
* The direction (mode) is specified in the channel object. Note the DSP
* address is specified for channels opened in direct I/O mode.
*/
int bridge_chnl_add_io_req(struct chnl_object *chnl_obj, void *host_buf,
u32 byte_size, u32 buf_size,
u32 dw_dsp_addr, u32 dw_arg)
{
int status = 0;
struct chnl_object *pchnl = (struct chnl_object *)chnl_obj;
struct chnl_irp *chnl_packet_obj = NULL;
struct bridge_dev_context *dev_ctxt;
struct dev_object *dev_obj;
u8 dw_state;
bool is_eos;
struct chnl_mgr *chnl_mgr_obj = pchnl->chnl_mgr_obj;
u8 *host_sys_buf = NULL;
bool sched_dpc = false;
u16 mb_val = 0;
is_eos = (byte_size == 0);
/* Validate args */
if (!host_buf || !pchnl)
return -EFAULT;
if (is_eos && CHNL_IS_INPUT(pchnl->chnl_mode))
return -EPERM;
/*
* Check the channel state: only queue chirp if channel state
* allows it.
*/
dw_state = pchnl->state;
if (dw_state != CHNL_STATEREADY) {
if (dw_state & CHNL_STATECANCEL)
return -ECANCELED;
if ((dw_state & CHNL_STATEEOS) &&
CHNL_IS_OUTPUT(pchnl->chnl_mode))
return -EPIPE;
/* No other possible states left */
DBC_ASSERT(0);
}
dev_obj = dev_get_first();
dev_get_bridge_context(dev_obj, &dev_ctxt);
if (!dev_ctxt)
return -EFAULT;
if (pchnl->chnl_type == CHNL_PCPY && pchnl->chnl_id > 1 && host_buf) {
if (!(host_buf < (void *)USERMODE_ADDR)) {
host_sys_buf = host_buf;
goto func_cont;
}
/* if addr in user mode, then copy to kernel space */
host_sys_buf = kmalloc(buf_size, GFP_KERNEL);
if (host_sys_buf == NULL)
return -ENOMEM;
if (CHNL_IS_OUTPUT(pchnl->chnl_mode)) {
status = copy_from_user(host_sys_buf, host_buf,
buf_size);
if (status) {
kfree(host_sys_buf);
host_sys_buf = NULL;
return -EFAULT;
}
}
}
func_cont:
/* Mailbox IRQ is disabled to avoid race condition with DMA/ZCPY
* channels. DPCCS is held to avoid race conditions with PCPY channels.
* If DPC is scheduled in process context (iosm_schedule) and any
* non-mailbox interrupt occurs, that DPC will run and break CS. Hence
* we disable ALL DPCs. We will try to disable ONLY IO DPC later. */
spin_lock_bh(&chnl_mgr_obj->chnl_mgr_lock);
omap_mbox_disable_irq(dev_ctxt->mbox, IRQ_RX);
if (pchnl->chnl_type == CHNL_PCPY) {
/* This is a processor-copy channel. */
if (CHNL_IS_OUTPUT(pchnl->chnl_mode)) {
/* Check buffer size on output channels for fit. */
if (byte_size > io_buf_size(
pchnl->chnl_mgr_obj->iomgr)) {
status = -EINVAL;
goto out;
}
}
}
/* Get a free chirp: */
if (list_empty(&pchnl->free_packets_list)) {
status = -EIO;
goto out;
}
chnl_packet_obj = list_first_entry(&pchnl->free_packets_list,
struct chnl_irp, link);
list_del(&chnl_packet_obj->link);
/* Enqueue the chirp on the chnl's IORequest queue: */
chnl_packet_obj->host_user_buf = chnl_packet_obj->host_sys_buf =
host_buf;
if (pchnl->chnl_type == CHNL_PCPY && pchnl->chnl_id > 1)
chnl_packet_obj->host_sys_buf = host_sys_buf;
/*
* Note: for dma chans dw_dsp_addr contains dsp address
* of SM buffer.
*/
DBC_ASSERT(chnl_mgr_obj->word_size != 0);
/* DSP address */
chnl_packet_obj->dsp_tx_addr = dw_dsp_addr / chnl_mgr_obj->word_size;
chnl_packet_obj->byte_size = byte_size;
chnl_packet_obj->buf_size = buf_size;
/* Only valid for output channel */
chnl_packet_obj->arg = dw_arg;
chnl_packet_obj->status = (is_eos ? CHNL_IOCSTATEOS :
CHNL_IOCSTATCOMPLETE);
list_add_tail(&chnl_packet_obj->link, &pchnl->io_requests);
pchnl->cio_reqs++;
DBC_ASSERT(pchnl->cio_reqs <= pchnl->chnl_packets);
/*
* If end of stream, update the channel state to prevent
* more IOR's.
*/
if (is_eos)
pchnl->state |= CHNL_STATEEOS;
/* Legacy DSM Processor-Copy */
DBC_ASSERT(pchnl->chnl_type == CHNL_PCPY);
/* Request IO from the DSP */
io_request_chnl(chnl_mgr_obj->iomgr, pchnl,
(CHNL_IS_INPUT(pchnl->chnl_mode) ? IO_INPUT :
IO_OUTPUT), &mb_val);
sched_dpc = true;
out:
omap_mbox_enable_irq(dev_ctxt->mbox, IRQ_RX);
spin_unlock_bh(&chnl_mgr_obj->chnl_mgr_lock);
if (mb_val != 0)
sm_interrupt_dsp(dev_ctxt, mb_val);
/* Schedule a DPC, to do the actual data transfer */
if (sched_dpc)
iosm_schedule(chnl_mgr_obj->iomgr);
return status;
}
/*
* ======== bridge_chnl_cancel_io ========
* Return all I/O requests to the client which have not yet been
* transferred. The channel's I/O completion object is
* signalled, and all the I/O requests are queued as IOC's, with the
* status field set to CHNL_IOCSTATCANCEL.
* This call is typically used in abort situations, and is a prelude to
* chnl_close();
*/
int bridge_chnl_cancel_io(struct chnl_object *chnl_obj)
{
struct chnl_object *pchnl = (struct chnl_object *)chnl_obj;
u32 chnl_id = -1;
s8 chnl_mode;
struct chnl_irp *chirp, *tmp;
struct chnl_mgr *chnl_mgr_obj = NULL;
/* Check args: */
if (!pchnl || !pchnl->chnl_mgr_obj)
return -EFAULT;
chnl_id = pchnl->chnl_id;
chnl_mode = pchnl->chnl_mode;
chnl_mgr_obj = pchnl->chnl_mgr_obj;
/* Mark this channel as cancelled, to prevent further IORequests or
* IORequests or dispatching. */
spin_lock_bh(&chnl_mgr_obj->chnl_mgr_lock);
pchnl->state |= CHNL_STATECANCEL;
if (list_empty(&pchnl->io_requests)) {
spin_unlock_bh(&chnl_mgr_obj->chnl_mgr_lock);
return 0;
}
if (pchnl->chnl_type == CHNL_PCPY) {
/* Indicate we have no more buffers available for transfer: */
if (CHNL_IS_INPUT(pchnl->chnl_mode)) {
io_cancel_chnl(chnl_mgr_obj->iomgr, chnl_id);
} else {
/* Record that we no longer have output buffers
* available: */
chnl_mgr_obj->output_mask &= ~(1 << chnl_id);
}
}
/* Move all IOR's to IOC queue: */
list_for_each_entry_safe(chirp, tmp, &pchnl->io_requests, link) {
list_del(&chirp->link);
chirp->byte_size = 0;
chirp->status |= CHNL_IOCSTATCANCEL;
list_add_tail(&chirp->link, &pchnl->io_completions);
pchnl->cio_cs++;
pchnl->cio_reqs--;
DBC_ASSERT(pchnl->cio_reqs >= 0);
}
spin_unlock_bh(&chnl_mgr_obj->chnl_mgr_lock);
return 0;
}
/*
* ======== bridge_chnl_close ========
* Purpose:
* Ensures all pending I/O on this channel is cancelled, discards all
* queued I/O completion notifications, then frees the resources allocated
* for this channel, and makes the corresponding logical channel id
* available for subsequent use.
*/
int bridge_chnl_close(struct chnl_object *chnl_obj)
{
int status;
struct chnl_object *pchnl = (struct chnl_object *)chnl_obj;
/* Check args: */
if (!pchnl)
return -EFAULT;
/* Cancel IO: this ensures no further IO requests or notifications */
status = bridge_chnl_cancel_io(chnl_obj);
if (status)
return status;
/* Assert I/O on this channel is now cancelled: Protects from io_dpc */
DBC_ASSERT((pchnl->state & CHNL_STATECANCEL));
/* Invalidate channel object: Protects from CHNL_GetIOCompletion() */
/* Free the slot in the channel manager: */
pchnl->chnl_mgr_obj->channels[pchnl->chnl_id] = NULL;
spin_lock_bh(&pchnl->chnl_mgr_obj->chnl_mgr_lock);
pchnl->chnl_mgr_obj->open_channels -= 1;
spin_unlock_bh(&pchnl->chnl_mgr_obj->chnl_mgr_lock);
if (pchnl->ntfy_obj) {
ntfy_delete(pchnl->ntfy_obj);
kfree(pchnl->ntfy_obj);
pchnl->ntfy_obj = NULL;
}
/* Reset channel event: (NOTE: user_event freed in user context) */
if (pchnl->sync_event) {
sync_reset_event(pchnl->sync_event);
kfree(pchnl->sync_event);
pchnl->sync_event = NULL;
}
/* Free I/O request and I/O completion queues: */
free_chirp_list(&pchnl->io_completions);
pchnl->cio_cs = 0;
free_chirp_list(&pchnl->io_requests);
pchnl->cio_reqs = 0;
free_chirp_list(&pchnl->free_packets_list);
/* Release channel object. */
kfree(pchnl);
return status;
}
/*
* ======== bridge_chnl_create ========
* Create a channel manager object, responsible for opening new channels
* and closing old ones for a given board.
*/
int bridge_chnl_create(struct chnl_mgr **channel_mgr,
struct dev_object *hdev_obj,
const struct chnl_mgrattrs *mgr_attrts)
{
int status = 0;
struct chnl_mgr *chnl_mgr_obj = NULL;
u8 max_channels;
/* Check DBC requirements: */
DBC_REQUIRE(channel_mgr != NULL);
DBC_REQUIRE(mgr_attrts != NULL);
DBC_REQUIRE(mgr_attrts->max_channels > 0);
DBC_REQUIRE(mgr_attrts->max_channels <= CHNL_MAXCHANNELS);
DBC_REQUIRE(mgr_attrts->word_size != 0);
/* Allocate channel manager object */
chnl_mgr_obj = kzalloc(sizeof(struct chnl_mgr), GFP_KERNEL);
if (chnl_mgr_obj) {
/*
* The max_channels attr must equal the # of supported chnls for
* each transport(# chnls for PCPY = DDMA = ZCPY): i.e.
* mgr_attrts->max_channels = CHNL_MAXCHANNELS =
* DDMA_MAXDDMACHNLS = DDMA_MAXZCPYCHNLS.
*/
DBC_ASSERT(mgr_attrts->max_channels == CHNL_MAXCHANNELS);
max_channels = CHNL_MAXCHANNELS + CHNL_MAXCHANNELS * CHNL_PCPY;
/* Create array of channels */
chnl_mgr_obj->channels = kzalloc(sizeof(struct chnl_object *)
* max_channels, GFP_KERNEL);
if (chnl_mgr_obj->channels) {
/* Initialize chnl_mgr object */
chnl_mgr_obj->type = CHNL_TYPESM;
chnl_mgr_obj->word_size = mgr_attrts->word_size;
/* Total # chnls supported */
chnl_mgr_obj->max_channels = max_channels;
chnl_mgr_obj->open_channels = 0;
chnl_mgr_obj->output_mask = 0;
chnl_mgr_obj->last_output = 0;
chnl_mgr_obj->dev_obj = hdev_obj;
spin_lock_init(&chnl_mgr_obj->chnl_mgr_lock);
} else {
status = -ENOMEM;
}
} else {
status = -ENOMEM;
}
if (status) {
bridge_chnl_destroy(chnl_mgr_obj);
*channel_mgr = NULL;
} else {
/* Return channel manager object to caller... */
*channel_mgr = chnl_mgr_obj;
}
return status;
}
/*
* ======== bridge_chnl_destroy ========
* Purpose:
* Close all open channels, and destroy the channel manager.
*/
int bridge_chnl_destroy(struct chnl_mgr *hchnl_mgr)
{
int status = 0;
struct chnl_mgr *chnl_mgr_obj = hchnl_mgr;
u32 chnl_id;
if (hchnl_mgr) {
/* Close all open channels: */
for (chnl_id = 0; chnl_id < chnl_mgr_obj->max_channels;
chnl_id++) {
status =
bridge_chnl_close(chnl_mgr_obj->channels
[chnl_id]);
if (status)
dev_dbg(bridge, "%s: Error status 0x%x\n",
__func__, status);
}
/* Free channel manager object: */
kfree(chnl_mgr_obj->channels);
/* Set hchnl_mgr to NULL in device object. */
dev_set_chnl_mgr(chnl_mgr_obj->dev_obj, NULL);
/* Free this Chnl Mgr object: */
kfree(hchnl_mgr);
} else {
status = -EFAULT;
}
return status;
}
/*
* ======== bridge_chnl_flush_io ========
* purpose:
* Flushes all the outstanding data requests on a channel.
*/
int bridge_chnl_flush_io(struct chnl_object *chnl_obj, u32 timeout)
{
int status = 0;
struct chnl_object *pchnl = (struct chnl_object *)chnl_obj;
s8 chnl_mode = -1;
struct chnl_mgr *chnl_mgr_obj;
struct chnl_ioc chnl_ioc_obj;
/* Check args: */
if (pchnl) {
if ((timeout == CHNL_IOCNOWAIT)
&& CHNL_IS_OUTPUT(pchnl->chnl_mode)) {
status = -EINVAL;
} else {
chnl_mode = pchnl->chnl_mode;
chnl_mgr_obj = pchnl->chnl_mgr_obj;
}
} else {
status = -EFAULT;
}
if (!status) {
/* Note: Currently, if another thread continues to add IO
* requests to this channel, this function will continue to
* flush all such queued IO requests. */
if (CHNL_IS_OUTPUT(chnl_mode)
&& (pchnl->chnl_type == CHNL_PCPY)) {
/* Wait for IO completions, up to the specified
* timeout: */
while (!list_empty(&pchnl->io_requests) && !status) {
status = bridge_chnl_get_ioc(chnl_obj,
timeout, &chnl_ioc_obj);
if (status)
continue;
if (chnl_ioc_obj.status & CHNL_IOCSTATTIMEOUT)
status = -ETIMEDOUT;
}
} else {
status = bridge_chnl_cancel_io(chnl_obj);
/* Now, leave the channel in the ready state: */
pchnl->state &= ~CHNL_STATECANCEL;
}
}
DBC_ENSURE(status || list_empty(&pchnl->io_requests));
return status;
}
/*
* ======== bridge_chnl_get_info ========
* Purpose:
* Retrieve information related to a channel.
*/
int bridge_chnl_get_info(struct chnl_object *chnl_obj,
struct chnl_info *channel_info)
{
int status = 0;
struct chnl_object *pchnl = (struct chnl_object *)chnl_obj;
if (channel_info != NULL) {
if (pchnl) {
/* Return the requested information: */
channel_info->chnl_mgr = pchnl->chnl_mgr_obj;
channel_info->event_obj = pchnl->user_event;
channel_info->cnhl_id = pchnl->chnl_id;
channel_info->mode = pchnl->chnl_mode;
channel_info->bytes_tx = pchnl->bytes_moved;
channel_info->process = pchnl->process;
channel_info->sync_event = pchnl->sync_event;
channel_info->cio_cs = pchnl->cio_cs;
channel_info->cio_reqs = pchnl->cio_reqs;
channel_info->state = pchnl->state;
} else {
status = -EFAULT;
}
} else {
status = -EFAULT;
}
return status;
}
/*
* ======== bridge_chnl_get_ioc ========
* Optionally wait for I/O completion on a channel. Dequeue an I/O
* completion record, which contains information about the completed
* I/O request.
* Note: Ensures Channel Invariant (see notes above).
*/
int bridge_chnl_get_ioc(struct chnl_object *chnl_obj, u32 timeout,
struct chnl_ioc *chan_ioc)
{
int status = 0;
struct chnl_object *pchnl = (struct chnl_object *)chnl_obj;
struct chnl_irp *chnl_packet_obj;
int stat_sync;
bool dequeue_ioc = true;
struct chnl_ioc ioc = { NULL, 0, 0, 0, 0 };
u8 *host_sys_buf = NULL;
struct bridge_dev_context *dev_ctxt;
struct dev_object *dev_obj;
/* Check args: */
if (!chan_ioc || !pchnl) {
status = -EFAULT;
} else if (timeout == CHNL_IOCNOWAIT) {
if (list_empty(&pchnl->io_completions))
status = -EREMOTEIO;
}
dev_obj = dev_get_first();
dev_get_bridge_context(dev_obj, &dev_ctxt);
if (!dev_ctxt)
status = -EFAULT;
if (status)
goto func_end;
ioc.status = CHNL_IOCSTATCOMPLETE;
if (timeout !=
CHNL_IOCNOWAIT && list_empty(&pchnl->io_completions)) {
if (timeout == CHNL_IOCINFINITE)
timeout = SYNC_INFINITE;
stat_sync = sync_wait_on_event(pchnl->sync_event, timeout);
if (stat_sync == -ETIME) {
/* No response from DSP */
ioc.status |= CHNL_IOCSTATTIMEOUT;
dequeue_ioc = false;
} else if (stat_sync == -EPERM) {
/* This can occur when the user mode thread is
* aborted (^C), or when _VWIN32_WaitSingleObject()
* fails due to unknown causes. */
/* Even though Wait failed, there may be something in
* the Q: */
if (list_empty(&pchnl->io_completions)) {
ioc.status |= CHNL_IOCSTATCANCEL;
dequeue_ioc = false;
}
}
}
/* See comment in AddIOReq */
spin_lock_bh(&pchnl->chnl_mgr_obj->chnl_mgr_lock);
omap_mbox_disable_irq(dev_ctxt->mbox, IRQ_RX);
if (dequeue_ioc) {
/* Dequeue IOC and set chan_ioc; */
DBC_ASSERT(!list_empty(&pchnl->io_completions));
chnl_packet_obj = list_first_entry(&pchnl->io_completions,
struct chnl_irp, link);
list_del(&chnl_packet_obj->link);
/* Update chan_ioc from channel state and chirp: */
pchnl->cio_cs--;
/*
* If this is a zero-copy channel, then set IOC's pbuf
* to the DSP's address. This DSP address will get
* translated to user's virtual addr later.
*/
host_sys_buf = chnl_packet_obj->host_sys_buf;
ioc.buf = chnl_packet_obj->host_user_buf;
ioc.byte_size = chnl_packet_obj->byte_size;
ioc.buf_size = chnl_packet_obj->buf_size;
ioc.arg = chnl_packet_obj->arg;
ioc.status |= chnl_packet_obj->status;
/* Place the used chirp on the free list: */
list_add_tail(&chnl_packet_obj->link,
&pchnl->free_packets_list);
} else {
ioc.buf = NULL;
ioc.byte_size = 0;
ioc.arg = 0;
ioc.buf_size = 0;
}
/* Ensure invariant: If any IOC's are queued for this channel... */
if (!list_empty(&pchnl->io_completions)) {
/* Since DSPStream_Reclaim() does not take a timeout
* parameter, we pass the stream's timeout value to
* bridge_chnl_get_ioc. We cannot determine whether or not
* we have waited in User mode. Since the stream's timeout
* value may be non-zero, we still have to set the event.
* Therefore, this optimization is taken out.
*
* if (timeout == CHNL_IOCNOWAIT) {
* ... ensure event is set..
* sync_set_event(pchnl->sync_event);
* } */
sync_set_event(pchnl->sync_event);
} else {
/* else, if list is empty, ensure event is reset. */
sync_reset_event(pchnl->sync_event);
}
omap_mbox_enable_irq(dev_ctxt->mbox, IRQ_RX);
spin_unlock_bh(&pchnl->chnl_mgr_obj->chnl_mgr_lock);
if (dequeue_ioc
&& (pchnl->chnl_type == CHNL_PCPY && pchnl->chnl_id > 1)) {
if (!(ioc.buf < (void *)USERMODE_ADDR))
goto func_cont;
/* If the addr is in user mode, then copy it */
if (!host_sys_buf || !ioc.buf) {
status = -EFAULT;
goto func_cont;
}
if (!CHNL_IS_INPUT(pchnl->chnl_mode))
goto func_cont1;
/*host_user_buf */
status = copy_to_user(ioc.buf, host_sys_buf, ioc.byte_size);
if (status) {
if (current->flags & PF_EXITING)
status = 0;
}
if (status)
status = -EFAULT;
func_cont1:
kfree(host_sys_buf);
}
func_cont:
/* Update User's IOC block: */
*chan_ioc = ioc;
func_end:
return status;
}
/*
* ======== bridge_chnl_get_mgr_info ========
* Retrieve information related to the channel manager.
*/
int bridge_chnl_get_mgr_info(struct chnl_mgr *hchnl_mgr, u32 ch_id,
struct chnl_mgrinfo *mgr_info)
{
struct chnl_mgr *chnl_mgr_obj = (struct chnl_mgr *)hchnl_mgr;
if (!mgr_info || !hchnl_mgr)
return -EFAULT;
if (ch_id > CHNL_MAXCHANNELS)
return -ECHRNG;
/* Return the requested information: */
mgr_info->chnl_obj = chnl_mgr_obj->channels[ch_id];
mgr_info->open_channels = chnl_mgr_obj->open_channels;
mgr_info->type = chnl_mgr_obj->type;
/* total # of chnls */
mgr_info->max_channels = chnl_mgr_obj->max_channels;
return 0;
}
/*
* ======== bridge_chnl_idle ========
* Idles a particular channel.
*/
int bridge_chnl_idle(struct chnl_object *chnl_obj, u32 timeout,
bool flush_data)
{
s8 chnl_mode;
struct chnl_mgr *chnl_mgr_obj;
int status = 0;
DBC_REQUIRE(chnl_obj);
chnl_mode = chnl_obj->chnl_mode;
chnl_mgr_obj = chnl_obj->chnl_mgr_obj;
if (CHNL_IS_OUTPUT(chnl_mode) && !flush_data) {
/* Wait for IO completions, up to the specified timeout: */
status = bridge_chnl_flush_io(chnl_obj, timeout);
} else {
status = bridge_chnl_cancel_io(chnl_obj);
/* Reset the byte count and put channel back in ready state. */
chnl_obj->bytes_moved = 0;
chnl_obj->state &= ~CHNL_STATECANCEL;
}
return status;
}
/*
* ======== bridge_chnl_open ========
* Open a new half-duplex channel to the DSP board.
*/
int bridge_chnl_open(struct chnl_object **chnl,
struct chnl_mgr *hchnl_mgr, s8 chnl_mode,
u32 ch_id, const struct chnl_attr *pattrs)
{
int status = 0;
struct chnl_mgr *chnl_mgr_obj = hchnl_mgr;
struct chnl_object *pchnl = NULL;
struct sync_object *sync_event = NULL;
/* Ensure DBC requirements: */
DBC_REQUIRE(chnl != NULL);
DBC_REQUIRE(pattrs != NULL);
DBC_REQUIRE(hchnl_mgr != NULL);
*chnl = NULL;
/* Validate Args: */
if (!pattrs->uio_reqs)
return -EINVAL;
if (!hchnl_mgr)
return -EFAULT;
if (ch_id != CHNL_PICKFREE) {
if (ch_id >= chnl_mgr_obj->max_channels)
return -ECHRNG;
if (chnl_mgr_obj->channels[ch_id] != NULL)
return -EALREADY;
} else {
/* Check for free channel */
status = search_free_channel(chnl_mgr_obj, &ch_id);
if (status)
return status;
}
DBC_ASSERT(ch_id < chnl_mgr_obj->max_channels);
/* Create channel object: */
pchnl = kzalloc(sizeof(struct chnl_object), GFP_KERNEL);
if (!pchnl)
return -ENOMEM;
/* Protect queues from io_dpc: */
pchnl->state = CHNL_STATECANCEL;
/* Allocate initial IOR and IOC queues: */
status = create_chirp_list(&pchnl->free_packets_list,
pattrs->uio_reqs);
if (status)
goto out_err;
INIT_LIST_HEAD(&pchnl->io_requests);
INIT_LIST_HEAD(&pchnl->io_completions);
pchnl->chnl_packets = pattrs->uio_reqs;
pchnl->cio_cs = 0;
pchnl->cio_reqs = 0;
sync_event = kzalloc(sizeof(struct sync_object), GFP_KERNEL);
if (!sync_event) {
status = -ENOMEM;
goto out_err;
}
sync_init_event(sync_event);
pchnl->ntfy_obj = kmalloc(sizeof(struct ntfy_object), GFP_KERNEL);
if (!pchnl->ntfy_obj) {
status = -ENOMEM;
goto out_err;
}
ntfy_init(pchnl->ntfy_obj);
/* Initialize CHNL object fields: */
pchnl->chnl_mgr_obj = chnl_mgr_obj;
pchnl->chnl_id = ch_id;
pchnl->chnl_mode = chnl_mode;
pchnl->user_event = sync_event;
pchnl->sync_event = sync_event;
/* Get the process handle */
pchnl->process = current->tgid;
pchnl->cb_arg = 0;
pchnl->bytes_moved = 0;
/* Default to proc-copy */
pchnl->chnl_type = CHNL_PCPY;
/* Insert channel object in channel manager: */
chnl_mgr_obj->channels[pchnl->chnl_id] = pchnl;
spin_lock_bh(&chnl_mgr_obj->chnl_mgr_lock);
chnl_mgr_obj->open_channels++;
spin_unlock_bh(&chnl_mgr_obj->chnl_mgr_lock);
/* Return result... */
pchnl->state = CHNL_STATEREADY;
*chnl = pchnl;
return status;
out_err:
/* Free memory */
free_chirp_list(&pchnl->io_completions);
free_chirp_list(&pchnl->io_requests);
free_chirp_list(&pchnl->free_packets_list);
kfree(sync_event);
if (pchnl->ntfy_obj) {
ntfy_delete(pchnl->ntfy_obj);
kfree(pchnl->ntfy_obj);
pchnl->ntfy_obj = NULL;
}
kfree(pchnl);
return status;
}
/*
* ======== bridge_chnl_register_notify ========
* Registers for events on a particular channel.
*/
int bridge_chnl_register_notify(struct chnl_object *chnl_obj,
u32 event_mask, u32 notify_type,
struct dsp_notification *hnotification)
{
int status = 0;
DBC_ASSERT(!(event_mask & ~(DSP_STREAMDONE | DSP_STREAMIOCOMPLETION)));
if (event_mask)
status = ntfy_register(chnl_obj->ntfy_obj, hnotification,
event_mask, notify_type);
else
status = ntfy_unregister(chnl_obj->ntfy_obj, hnotification);
return status;
}
/*
* ======== create_chirp_list ========
* Purpose:
* Initialize a queue of channel I/O Request/Completion packets.
* Parameters:
* list: Pointer to a list_head
* chirps: Number of Chirps to allocate.
* Returns:
* 0 if successful, error code otherwise.
* Requires:
* Ensures:
*/
static int create_chirp_list(struct list_head *list, u32 chirps)
{
struct chnl_irp *chirp;
u32 i;
INIT_LIST_HEAD(list);
/* Make N chirps and place on queue. */
for (i = 0; i < chirps; i++) {
chirp = kzalloc(sizeof(struct chnl_irp), GFP_KERNEL);
if (!chirp)
break;
list_add_tail(&chirp->link, list);
}
/* If we couldn't allocate all chirps, free those allocated: */
if (i != chirps) {
free_chirp_list(list);
return -ENOMEM;
}
return 0;
}
/*
* ======== free_chirp_list ========
* Purpose:
* Free the queue of Chirps.
*/
static void free_chirp_list(struct list_head *chirp_list)
{
struct chnl_irp *chirp, *tmp;
DBC_REQUIRE(chirp_list != NULL);
list_for_each_entry_safe(chirp, tmp, chirp_list, link) {
list_del(&chirp->link);
kfree(chirp);
}
}
/*
* ======== search_free_channel ========
* Search for a free channel slot in the array of channel pointers.
*/
static int search_free_channel(struct chnl_mgr *chnl_mgr_obj,
u32 *chnl)
{
int status = -ENOSR;
u32 i;
DBC_REQUIRE(chnl_mgr_obj);
for (i = 0; i < chnl_mgr_obj->max_channels; i++) {
if (chnl_mgr_obj->channels[i] == NULL) {
status = 0;
*chnl = i;
break;
}
}
return status;
}
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