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linux/drivers/media/video/pvrusb2/pvrusb2-debug.h

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/*
*
* Copyright (C) 2005 Mike Isely <isely@pobox.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __PVRUSB2_DEBUG_H
#define __PVRUSB2_DEBUG_H
extern int pvrusb2_debug;
#define pvr2_trace(msk, fmt, arg...) do {if(msk & pvrusb2_debug) printk(KERN_INFO "pvrusb2: " fmt "\n", ##arg); } while (0)
/* These are listed in *rough* order of decreasing usefulness and
increasing noise level. */
#define PVR2_TRACE_INFO (1 << 0) /* Normal messages */
#define PVR2_TRACE_ERROR_LEGS (1 << 1) /* error messages */
#define PVR2_TRACE_TOLERANCE (1 << 2) /* track tolerance-affected errors */
#define PVR2_TRACE_TRAP (1 << 3) /* Trap & report app misbehavior */
#define PVR2_TRACE_STD (1 << 4) /* Log video standard stuff */
#define PVR2_TRACE_INIT (1 << 5) /* misc initialization steps */
#define PVR2_TRACE_START_STOP (1 << 6) /* Streaming start / stop */
#define PVR2_TRACE_CTL (1 << 7) /* commit of control changes */
#define PVR2_TRACE_STATE (1 << 8) /* Device state changes */
#define PVR2_TRACE_STBITS (1 << 9) /* Individual bit state changes */
#define PVR2_TRACE_EEPROM (1 << 10) /* eeprom parsing / report */
#define PVR2_TRACE_STRUCT (1 << 11) /* internal struct creation */
#define PVR2_TRACE_OPEN_CLOSE (1 << 12) /* application open / close */
V4L/DVB (7321): pvrusb2: Rework context handling and initialization This change significantly rearranges pvr2_context level initialization and operation: 1. A new kernel thread is set up for management of the context. 2. Destruction of the pvr2_context instance is moved into the kernel thread. No other context is able to remove the instance; doing this simplifies lock handling. 3. The callback into pvrusb2-main, which is used to trigger initialization of each interface, is now issued from this kernel thread. Previously it had been indirectly issued out of the work queue thread in pvr2_hdw, which led to deadlock issues if the interface needed to change a control setting (which in turn requires dispatch of another work queue entry). 4. Callbacks into the interfaces (via the pvr2_channel structure) are now issued strictly from this thread. The net result of this is that such callback functions can now also safely operate driver controls without deadlocking the work queue. (At the moment this is not actually a problem, but I'm anticipating issues with this in the future). 5. There is no longer any need for anyone to enter / exit the pvr2_context structure. Implementation of the kernel thread here allows this all to be internal now, simplifying other logic. 6. A very very longstanding issue involving a mutex deadlock between the pvrusb2 driver and v4l should now be solved. The deadlock involved the pvr2_context mutex and a globals-protecting mutex in v4l. During initialization the driver would take the pvr2_context mutex first then the v4l2 interface would register with v4l and implicitly take the v4l mutex. Later when v4l would call back into the driver, the two mutexes could possibly be taken in the opposite order, a situation that can lead to deadlock. In practice this really wasn't an issue unless a v4l app tried to start VERY early after the driver appeared. However it still needed to be solved, and with the use of the kernel thread relieving need for pvr2_context mutex, the problem should be finally solved. Signed-off-by: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-22 10:45:45 -07:00
#define PVR2_TRACE_CTXT (1 << 13) /* Main context tracking */
#define PVR2_TRACE_SYSFS (1 << 14) /* Sysfs driven I/O */
#define PVR2_TRACE_FIRMWARE (1 << 15) /* firmware upload actions */
#define PVR2_TRACE_CHIPS (1 << 16) /* chip broadcast operation */
#define PVR2_TRACE_I2C (1 << 17) /* I2C related stuff */
#define PVR2_TRACE_I2C_CMD (1 << 18) /* Software commands to I2C modules */
#define PVR2_TRACE_I2C_CORE (1 << 19) /* I2C core debugging */
#define PVR2_TRACE_I2C_TRAF (1 << 20) /* I2C traffic through the adapter */
#define PVR2_TRACE_V4LIOCTL (1 << 21) /* v4l ioctl details */
#define PVR2_TRACE_ENCODER (1 << 22) /* mpeg2 encoder operation */
#define PVR2_TRACE_BUF_POOL (1 << 23) /* Track buffer pool management */
#define PVR2_TRACE_BUF_FLOW (1 << 24) /* Track buffer flow in system */
#define PVR2_TRACE_DATA_FLOW (1 << 25) /* Track data flow */
#define PVR2_TRACE_DEBUGIFC (1 << 26) /* Debug interface actions */
#define PVR2_TRACE_GPIO (1 << 27) /* GPIO state bit changes */
#define PVR2_TRACE_DVB_FEED (1 << 28) /* DVB transport feed debug */
#endif /* __PVRUSB2_HDW_INTERNAL_H */
/*
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*/