mirror of
https://github.com/apache/nuttx.git
synced 2026-05-21 13:13:08 +08:00
Reimagine the USB MSC worker thread as a kernel thread (instead of a pthread)
This commit is contained in:
Gregory Nutt
@@ -7031,3 +7031,17 @@
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Kconfig; update naming to include SAM34_ (2014-3-24).
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* configs/sam4e-ek/include/board.h: Update HSMCI timing to use the
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CLKODD bit (2014-3-24).
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* drivers/include/mtd/Kconfig, sector512.c, and include/nuttx/mtd/mtd.h:
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Add a new MTD driver that can be used to contain another driver and
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force its apparent sector size to be 512 bytes (2014-3-24).
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* arch/arm/src/sam34/sam_lowputc.c sam_serial.c: Fix a mysterious
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multithreading bug that can log up the serial port (2014-3-14).
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* drivers/usbdev/Kconfig, usbmsc.c, usbmsc.h, and usbmsc_scsi.c:
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Redesign threading module used with the USB MSC driver. It was using
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pthreads before and these were changed to a kernel thread. The reason
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for this has to do with task grouping: A pthread is a memory of the
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group of the task that started it. A kernel thread is independent of
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the task that started in (other than knowing it as the parent). This
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allows me to remove so kludge logic to "deparent" the pthread on
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startup (2014-3-25).
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+16
-1
@@ -584,10 +584,25 @@ config USBMSC_VERSIONNO
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default "0x399"
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config USBMSC_REMOVABLE
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bool "Mass storage remove able"
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bool "Mass storage removable"
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default n
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---help---
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Select if the media is removable
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USB Composite Device Configuration
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config USBMSC_SCSI_PRIO
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int "USBMSC SCSI daemon priority"
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default 128
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---help---
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Priority of the SCSI kernel thread. This must be a relatively high
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priority so that the SCSI daemon can be response to USB block driver
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accesses.
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config USBMSC_SCSI_STACKSIZE
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int "USBMSC SCSI daemon stack size"
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default 2048
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---help---
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Stack size used with the SCSI kernel thread. The default value
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is not tuned.
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endif
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+76
-78
@@ -66,13 +66,13 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <string.h>
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#include <errno.h>
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#include <queue.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/kthread.h>
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#include <nuttx/arch.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/usb/usb.h>
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@@ -160,6 +160,10 @@ static struct usbdevclass_driverops_s g_driverops =
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NULL /* resume */
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};
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/* Used to hand-off the state structure when the SCSI worker thread is started */
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FAR struct usbmsc_dev_s *g_usbmsc_handoff;
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/****************************************************************************
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* Public Data
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****************************************************************************/
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@@ -642,7 +646,7 @@ static int usbmsc_setup(FAR struct usbdevclass_driver_s *driver,
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priv->theventset |= USBMSC_EVENT_CFGCHANGE;
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priv->thvalue = value;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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/* Return here... the response will be provided later by the
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* worker thread.
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@@ -681,7 +685,7 @@ static int usbmsc_setup(FAR struct usbdevclass_driver_s *driver,
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/* Signal to instantiate the interface change */
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priv->theventset |= USBMSC_EVENT_IFCHANGE;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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/* Return here... the response will be provided later by the
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* worker thread.
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@@ -748,7 +752,7 @@ static int usbmsc_setup(FAR struct usbdevclass_driver_s *driver,
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/* Signal to stop the current operation and reinitialize state */
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priv->theventset |= USBMSC_EVENT_RESET;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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/* Return here... the response will be provided later by the
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* worker thread.
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@@ -870,7 +874,7 @@ static void usbmsc_disconnect(FAR struct usbdevclass_driver_s *driver,
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/* Signal the worker thread */
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priv->theventset |= USBMSC_EVENT_DISCONNECT;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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irqrestore(flags);
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/* Perform the soft connect function so that we will we can be
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@@ -1109,7 +1113,7 @@ void usbmsc_wrcomplete(FAR struct usbdev_ep_s *ep, FAR struct usbdev_req_s *req)
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/* Inform the worker thread that a write request has been returned */
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priv->theventset |= USBMSC_EVENT_WRCOMPLETE;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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}
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/****************************************************************************
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@@ -1160,7 +1164,7 @@ void usbmsc_rdcomplete(FAR struct usbdev_ep_s *ep, FAR struct usbdev_req_s *req)
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/* Signal the worker thread that there is received data to be processed */
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priv->theventset |= USBMSC_EVENT_RDCOMPLETE;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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}
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break;
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@@ -1261,6 +1265,26 @@ void usbmsc_deferredresponse(FAR struct usbmsc_dev_s *priv, bool failed)
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}
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}
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/****************************************************************************
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* Name: usbmsc_sync_wait
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*
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* Description:
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* Wait for the worker thread to obtain the USB MSC state data
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*
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****************************************************************************/
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static inline void usbmsc_sync_wait(FAR struct usbmsc_dev_s *priv)
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{
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int ret;
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do
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{
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ret = sem_wait(&priv->thsynch);
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DEBUGASSERT(ret == OK || errno == EINTR);
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}
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while (ret < 0);
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}
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/****************************************************************************
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* User Interfaces
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****************************************************************************/
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@@ -1314,8 +1338,9 @@ int usbmsc_configure(unsigned int nluns, void **handle)
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priv = &alloc->dev;
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memset(priv, 0, sizeof(struct usbmsc_dev_s));
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pthread_mutex_init(&priv->mutex, NULL);
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pthread_cond_init(&priv->cond, NULL);
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sem_init(&priv->thsynch, 0, 0);
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sem_init(&priv->thlock, 0, 1);
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sem_init(&priv->thwaitsem, 0, 0);
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sq_init(&priv->wrreqlist);
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priv->nluns = nluns;
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@@ -1549,7 +1574,7 @@ int usbmsc_unbindlun(FAR void *handle, unsigned int lunno)
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#endif
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lun = &priv->luntab[lunno];
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pthread_mutex_lock(&priv->mutex);
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usbmsc_scsi_lock(priv);
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#ifdef CONFIG_DEBUG
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if (lun->inode == NULL)
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@@ -1566,7 +1591,7 @@ int usbmsc_unbindlun(FAR void *handle, unsigned int lunno)
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ret = OK;
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}
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pthread_mutex_unlock(&priv->mutex);
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usbmsc_scsi_unlock(priv);
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return ret;
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}
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@@ -1594,10 +1619,7 @@ int usbmsc_exportluns(FAR void *handle)
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FAR struct usbmsc_dev_s *priv;
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FAR struct usbmsc_driver_s *drvr;
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irqstate_t flags;
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#ifdef SDCC
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pthread_attr_t attr;
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#endif
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int ret;
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int ret = OK;
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#ifdef CONFIG_DEBUG
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if (!alloc)
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@@ -1610,35 +1632,35 @@ int usbmsc_exportluns(FAR void *handle)
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priv = &alloc->dev;
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drvr = &alloc->drvr;
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/* Start the worker thread */
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pthread_mutex_lock(&priv->mutex);
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priv->thstate = USBMSC_STATE_NOTSTARTED;
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priv->theventset = USBMSC_EVENT_NOEVENTS;
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#ifdef SDCC
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(void)pthread_attr_init(&attr);
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ret = pthread_create(&priv->thread, &attr, usbmsc_workerthread, (pthread_addr_t)priv);
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#else
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ret = pthread_create(&priv->thread, NULL, usbmsc_workerthread, (pthread_addr_t)priv);
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#endif
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if (ret != OK)
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{
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usbtrace(TRACE_CLSERROR(USBMSC_TRACEERR_THREADCREATE), (uint16_t)-ret);
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goto errout_with_mutex;
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}
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/* Detach the pthread so that we do not create a memory leak.
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/* Start the worker thread
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*
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* REVISIT: See related comments in usbmsc_uninitialize()
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* REVISIT: g_usbmsc_handoff is a global and, hence, really requires
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* some protection against re-entrant usage.
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*/
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ret = pthread_detach(priv->thread);
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if (ret != OK)
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usbmsc_scsi_lock(priv);
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priv->thstate = USBMSC_STATE_NOTSTARTED;
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priv->theventset = USBMSC_EVENT_NOEVENTS;
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g_usbmsc_handoff = priv;
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uvdbg("Starting SCSI worker thread\n");
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priv->thpid = KERNEL_THREAD("scsid", CONFIG_USBMSC_SCSI_PRIO,
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CONFIG_USBMSC_SCSI_STACKSIZE,
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usbmsc_scsi_main, NULL);
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if (priv->thpid <= 0)
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{
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usbtrace(TRACE_CLSERROR(USBMSC_TRACEERR_DETACH), (uint16_t)-ret);
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usbtrace(TRACE_CLSERROR(USBMSC_TRACEERR_THREADCREATE), (uint16_t)errno);
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goto errout_with_lock;
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}
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/* Wait for the worker thread to run and initialize */
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uvdbg("Waiting for the SCSI worker thread\n");
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usbmsc_sync_wait(priv);
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DEBUGASSERT(g_usbmsc_handoff == NULL);
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/* Register the USB storage class driver (unless we are part of a composite device) */
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#ifndef CONFIG_USBMSC_COMPOSITE
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@@ -1646,19 +1668,20 @@ int usbmsc_exportluns(FAR void *handle)
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if (ret != OK)
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{
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usbtrace(TRACE_CLSERROR(USBMSC_TRACEERR_DEVREGISTER), (uint16_t)-ret);
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goto errout_with_mutex;
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goto errout_with_lock;
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}
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#endif
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/* Signal to start the thread */
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uvdbg("Signalling for the SCSI worker thread\n");
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flags = irqsave();
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priv->theventset |= USBMSC_EVENT_READY;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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irqrestore(flags);
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errout_with_mutex:
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pthread_mutex_unlock(&priv->mutex);
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errout_with_lock:
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usbmsc_scsi_unlock(priv);
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return ret;
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}
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@@ -1742,7 +1765,7 @@ void usbmsc_uninitialize(FAR void *handle)
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* first pass uninitialization.
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*/
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if (priv->thread == 0)
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if (priv->thpid == 0)
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{
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/* In this second and final pass, all that remains to be done is to
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* free the memory resources.
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@@ -1759,54 +1782,28 @@ void usbmsc_uninitialize(FAR void *handle)
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{
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/* The thread was started.. Is it still running? */
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pthread_mutex_lock(&priv->mutex);
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usbmsc_scsi_lock(priv);
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if (priv->thstate != USBMSC_STATE_TERMINATED)
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{
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/* Yes.. Ask the thread to stop */
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flags = irqsave();
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priv->theventset |= USBMSC_EVENT_TERMINATEREQUEST;
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pthread_cond_signal(&priv->cond);
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usbmsc_scsi_signal(priv);
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irqrestore(flags);
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}
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pthread_mutex_unlock(&priv->mutex);
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usbmsc_scsi_unlock(priv);
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/* Wait for the thread to exit. This is necessary even if the
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* thread has already exitted in order to collect the join
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* garbage
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*/
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/* Wait for the thread to exit */
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#if 0
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/* REVISIT: pthread_join does not work in all contexts. In
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* particular, if usbmsc_uninitialize() executes in a different
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* task group than the group that includes the SCSI thread, then
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* pthread_join will fail.
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*
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* NOTE: If, for some reason, you wanted to restore this code,
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* there is now a matching pthread_detach() elsewhere to prevent
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* memory leaks.
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*/
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(void)pthread_join(priv->thread, &value);
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#else
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/* REVISIT: Calling pthread_mutex_lock and pthread_cond_wait
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* from outside of the task group is equally non-standard.
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* However, this actually works.
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*/
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pthread_mutex_lock(&priv->mutex);
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while ((priv->theventset & USBMSC_EVENT_TERMINATEREQUEST) != 0)
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{
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pthread_cond_wait(&priv->cond, &priv->mutex);
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usbmsc_sync_wait(priv);
|
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}
|
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|
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pthread_mutex_unlock(&priv->mutex);
|
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#endif
|
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}
|
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|
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priv->thread = 0;
|
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priv->thpid = 0;
|
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|
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/* Unregister the driver (unless we are a part of a composite device) */
|
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|
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@@ -1832,14 +1829,15 @@ void usbmsc_uninitialize(FAR void *handle)
|
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|
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/* Uninitialize and release the driver structure */
|
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|
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pthread_mutex_destroy(&priv->mutex);
|
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pthread_cond_destroy(&priv->cond);
|
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sem_destroy(&priv->thsynch);
|
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sem_destroy(&priv->thlock);
|
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sem_destroy(&priv->thwaitsem);
|
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|
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#ifndef CONFIG_USBMSC_COMPOSITE
|
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/* For the case of the composite driver, there is a two pass
|
||||
* uninitialization sequence. We cannot yet free the driver structure.
|
||||
* We will do that on the second pass (and we will know that it is the
|
||||
* second pass because of priv->thread == 0)
|
||||
* second pass because of priv->thpid == 0)
|
||||
*/
|
||||
|
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kfree(priv);
|
||||
|
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+72
-15
@@ -47,8 +47,8 @@
|
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#include <sys/types.h>
|
||||
#include <stdint.h>
|
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#include <stdbool.h>
|
||||
#include <pthread.h>
|
||||
#include <queue.h>
|
||||
#include <semaphore.h>
|
||||
|
||||
#include <nuttx/fs/fs.h>
|
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#include <nuttx/usb/storage.h>
|
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@@ -194,6 +194,16 @@
|
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#undef CONFIG_USBMSC_CONFIGSTR
|
||||
#define CONFIG_USBMSC_CONFIGSTR "Bulk"
|
||||
|
||||
/* SCSI daemon */
|
||||
|
||||
#ifndef CONFIG_USBMSC_SCSI_PRIO
|
||||
# define CONFIG_USBMSC_SCSI_PRIO 128
|
||||
#endif
|
||||
|
||||
#ifndef CONFIG_USBMSC_SCSI_STACKSIZE
|
||||
# define CONFIG_USBMSC_SCSI_STACKSIZE 2048
|
||||
#endif
|
||||
|
||||
/* Debug -- must be consistent with include/debug.h */
|
||||
|
||||
#ifdef CONFIG_CPP_HAVE_VARARGS
|
||||
@@ -443,17 +453,19 @@ struct usbmsc_lun_s
|
||||
size_t nsectors; /* Number of sectors in the partition */
|
||||
};
|
||||
|
||||
/* Describes the overall state of the driver */
|
||||
/* Describes the overall state of one instance of the driver */
|
||||
|
||||
struct usbmsc_dev_s
|
||||
{
|
||||
FAR struct usbdev_s *usbdev; /* usbdev driver pointer (Non-null if registered) */
|
||||
|
||||
/* Worker thread interface */
|
||||
/* SCSI worker kernel thread interface */
|
||||
|
||||
pthread_t thread; /* The worker thread */
|
||||
pthread_mutex_t mutex; /* Mutually exclusive access to resources*/
|
||||
pthread_cond_t cond; /* Used to signal worker thread */
|
||||
pid_t thpid; /* The worker thread task ID */
|
||||
sem_t thsynch; /* Used to synchronizer terminal events */
|
||||
sem_t thlock; /* Used to get exclusive access to the state data */
|
||||
sem_t thwaitsem; /* Used to signal worker thread */
|
||||
volatile bool thwaiting; /* True: worker thread is waiting for an event */
|
||||
volatile uint8_t thstate; /* State of the worker thread */
|
||||
volatile uint16_t theventset; /* Set of pending events signaled to worker thread */
|
||||
volatile uint8_t thvalue; /* Value passed with the event (must persist) */
|
||||
@@ -542,10 +554,55 @@ EXTERN const char g_compserialstr[];
|
||||
#define g_mscproductstr g_compproductstr
|
||||
#define g_mscserialstr g_compserialstr
|
||||
#endif
|
||||
|
||||
/* Used to hand-off the state structure when the SCSI worker thread is started */
|
||||
|
||||
EXTERN FAR struct usbmsc_dev_s *g_usbmsc_handoff;
|
||||
|
||||
/************************************************************************************
|
||||
* Public Function Prototypes
|
||||
************************************************************************************/
|
||||
|
||||
/************************************************************************************
|
||||
* Name: usbmsc_scsi_lock
|
||||
*
|
||||
* Description:
|
||||
* Get exclusive access to SCSI state data.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void usbmsc_scsi_lock(FAR struct usbmsc_dev_s *priv);
|
||||
|
||||
/************************************************************************************
|
||||
* Name: usbmsc_scsi_unlock
|
||||
*
|
||||
* Description:
|
||||
* Relinquish exclusive access to SCSI state data.
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
#define usbmsc_scsi_unlock(priv) sem_post(&priv->thlock)
|
||||
|
||||
/************************************************************************************
|
||||
* Name: usbmsc_scsi_signal
|
||||
*
|
||||
* Description:
|
||||
* Signal the SCSI worker thread that SCSI events need service.
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
void usbmsc_scsi_signal(FAR struct usbmsc_dev_s *priv);
|
||||
|
||||
/************************************************************************************
|
||||
* Name: usbmsc_synch_signal
|
||||
*
|
||||
* Description:
|
||||
* ACK controlling tasks request for synchronization.
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
#define usbmsc_synch_signal(priv) sem_post(&priv->thsynch)
|
||||
|
||||
/************************************************************************************
|
||||
* Name: usbmsc_mkstrdesc
|
||||
*
|
||||
@@ -607,7 +664,7 @@ FAR const struct usb_qualdesc_s *usbmsc_getqualdesc(void);
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: usbmsc_workerthread
|
||||
* Name: usbmsc_scsi_main
|
||||
*
|
||||
* Description:
|
||||
* This is the main function of the USB storage worker thread. It loops
|
||||
@@ -615,7 +672,7 @@ FAR const struct usb_qualdesc_s *usbmsc_getqualdesc(void);
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN void *usbmsc_workerthread(void *arg);
|
||||
int usbmsc_scsi_main(int argc, char *argv[]);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: usbmsc_setconfig
|
||||
@@ -626,7 +683,7 @@ EXTERN void *usbmsc_workerthread(void *arg);
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN int usbmsc_setconfig(FAR struct usbmsc_dev_s *priv, uint8_t config);
|
||||
int usbmsc_setconfig(FAR struct usbmsc_dev_s *priv, uint8_t config);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: usbmsc_resetconfig
|
||||
@@ -636,7 +693,7 @@ EXTERN int usbmsc_setconfig(FAR struct usbmsc_dev_s *priv, uint8_t config);
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN void usbmsc_resetconfig(FAR struct usbmsc_dev_s *priv);
|
||||
void usbmsc_resetconfig(FAR struct usbmsc_dev_s *priv);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: usbmsc_wrcomplete
|
||||
@@ -647,8 +704,8 @@ EXTERN void usbmsc_resetconfig(FAR struct usbmsc_dev_s *priv);
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN void usbmsc_wrcomplete(FAR struct usbdev_ep_s *ep,
|
||||
FAR struct usbdev_req_s *req);
|
||||
void usbmsc_wrcomplete(FAR struct usbdev_ep_s *ep,
|
||||
FAR struct usbdev_req_s *req);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: usbmsc_rdcomplete
|
||||
@@ -659,8 +716,8 @@ EXTERN void usbmsc_wrcomplete(FAR struct usbdev_ep_s *ep,
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN void usbmsc_rdcomplete(FAR struct usbdev_ep_s *ep,
|
||||
FAR struct usbdev_req_s *req);
|
||||
void usbmsc_rdcomplete(FAR struct usbdev_ep_s *ep,
|
||||
FAR struct usbdev_req_s *req);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: usbmsc_deferredresponse
|
||||
@@ -684,7 +741,7 @@ EXTERN void usbmsc_rdcomplete(FAR struct usbdev_ep_s *ep,
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN void usbmsc_deferredresponse(FAR struct usbmsc_dev_s *priv, bool failed);
|
||||
void usbmsc_deferredresponse(FAR struct usbmsc_dev_s *priv, bool failed);
|
||||
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
|
||||
+189
-46
File diff suppressed because it is too large
Load Diff
Reference in New Issue
Block a user