![Kirill Smelkov](/assets/img/avatar_default.png)
Using scripts/coccinelle/api/stream_open.cocci added in10dce8af34
("fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock"), search and convert to stream_open all in-kernel nonseekable_open users for which read and write actually do not depend on ppos and where there is no other methods in file_operations which assume @offset access. I've verified each generated change manually - that it is correct to convert - and each other nonseekable_open instance left - that it is either not correct to convert there, or that it is not converted due to current stream_open.cocci limitations. The script also does not convert files that should be valid to convert, but that currently have .llseek = noop_llseek or generic_file_llseek for unknown reason despite file being opened with nonseekable_open (e.g. drivers/input/mousedev.c) Among cases converted 14 were potentially vulnerable to read vs write deadlock (see details in10dce8af34
): drivers/char/pcmcia/cm4000_cs.c:1685:7-23: ERROR: cm4000_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/gnss/core.c:45:1-17: ERROR: gnss_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/hid/uhid.c:635:1-17: ERROR: uhid_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/infiniband/core/user_mad.c:988:1-17: ERROR: umad_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/input/evdev.c:527:1-17: ERROR: evdev_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/input/misc/uinput.c:401:1-17: ERROR: uinput_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/isdn/capi/capi.c:963:8-24: ERROR: capi_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/leds/uleds.c:77:1-17: ERROR: uleds_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/media/rc/lirc_dev.c:198:1-17: ERROR: lirc_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/s390/char/fs3270.c:488:1-17: ERROR: fs3270_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/usb/misc/ldusb.c:310:1-17: ERROR: ld_usb_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/xen/evtchn.c:667:8-24: ERROR: evtchn_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. net/batman-adv/icmp_socket.c:80:1-17: ERROR: batadv_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. net/rfkill/core.c:1146:8-24: ERROR: rfkill_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. and the rest were just safe to convert to stream_open because their read and write do not use ppos at all and corresponding file_operations do not have methods that assume @offset file access(*): arch/powerpc/platforms/52xx/mpc52xx_gpt.c:631:8-24: WARNING: mpc52xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_ibox_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_ibox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_mbox_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_mbox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_wbox_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_wbox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/um/drivers/harddog_kern.c:88:8-24: WARNING: harddog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/x86/kernel/cpu/microcode/core.c:430:33-49: WARNING: microcode_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/ds1620.c:215:8-24: WARNING: ds1620_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/dtlk.c:301:1-17: WARNING: dtlk_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/ipmi/ipmi_watchdog.c:840:9-25: WARNING: ipmi_wdog_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/pcmcia/scr24x_cs.c:95:8-24: WARNING: scr24x_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/tb0219.c:246:9-25: WARNING: tb0219_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/firewire/nosy.c:306:8-24: WARNING: nosy_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/hwmon/fschmd.c:840:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/hwmon/w83793.c:1344:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/ucma.c:1747:8-24: WARNING: ucma_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/ucm.c:1178:8-24: WARNING: ucm_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/uverbs_main.c:1086:8-24: WARNING: uverbs_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/input/joydev.c:282:1-17: WARNING: joydev_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/pci/switch/switchtec.c:393:1-17: WARNING: switchtec_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/platform/chrome/cros_ec_debugfs.c:135:8-24: WARNING: cros_ec_console_log_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/rtc/rtc-ds1374.c:470:9-25: WARNING: ds1374_wdt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/rtc/rtc-m41t80.c:805:9-25: WARNING: wdt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/char/tape_char.c:293:2-18: WARNING: tape_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/char/zcore.c:194:8-24: WARNING: zcore_reipl_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/crypto/zcrypt_api.c:528:8-24: WARNING: zcrypt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/spi/spidev.c:594:1-17: WARNING: spidev_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/staging/pi433/pi433_if.c:974:1-17: WARNING: pi433_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/acquirewdt.c:203:8-24: WARNING: acq_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/advantechwdt.c:202:8-24: WARNING: advwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/alim1535_wdt.c:252:8-24: WARNING: ali_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/alim7101_wdt.c:217:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ar7_wdt.c:166:8-24: WARNING: ar7_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/at91rm9200_wdt.c:113:8-24: WARNING: at91wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ath79_wdt.c:135:8-24: WARNING: ath79_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/bcm63xx_wdt.c:119:8-24: WARNING: bcm63xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/cpu5wdt.c:143:8-24: WARNING: cpu5wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/cpwd.c:397:8-24: WARNING: cpwd_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/eurotechwdt.c:319:8-24: WARNING: eurwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/f71808e_wdt.c:528:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/gef_wdt.c:232:8-24: WARNING: gef_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/geodewdt.c:95:8-24: WARNING: geodewdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ib700wdt.c:241:8-24: WARNING: ibwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ibmasr.c:326:8-24: WARNING: asr_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/indydog.c:80:8-24: WARNING: indydog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/intel_scu_watchdog.c:307:8-24: WARNING: intel_scu_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/iop_wdt.c:104:8-24: WARNING: iop_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/it8712f_wdt.c:330:8-24: WARNING: it8712f_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ixp4xx_wdt.c:68:8-24: WARNING: ixp4xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ks8695_wdt.c:145:8-24: WARNING: ks8695wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/m54xx_wdt.c:88:8-24: WARNING: m54xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/machzwd.c:336:8-24: WARNING: zf_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mixcomwd.c:153:8-24: WARNING: mixcomwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mtx-1_wdt.c:121:8-24: WARNING: mtx1_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mv64x60_wdt.c:136:8-24: WARNING: mv64x60_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/nuc900_wdt.c:134:8-24: WARNING: nuc900wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/nv_tco.c:164:8-24: WARNING: nv_tco_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pc87413_wdt.c:289:8-24: WARNING: pc87413_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd.c:698:8-24: WARNING: pcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd.c:737:8-24: WARNING: pcwd_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_pci.c:581:8-24: WARNING: pcipcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_pci.c:623:8-24: WARNING: pcipcwd_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_usb.c:488:8-24: WARNING: usb_pcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_usb.c:527:8-24: WARNING: usb_pcwd_temperature_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pika_wdt.c:121:8-24: WARNING: pikawdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pnx833x_wdt.c:119:8-24: WARNING: pnx833x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/rc32434_wdt.c:153:8-24: WARNING: rc32434_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/rdc321x_wdt.c:145:8-24: WARNING: rdc321x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/riowd.c:79:1-17: WARNING: riowd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sa1100_wdt.c:62:8-24: WARNING: sa1100dog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc60xxwdt.c:211:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc7240_wdt.c:139:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc8360.c:274:8-24: WARNING: sbc8360_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc_epx_c3.c:81:8-24: WARNING: epx_c3_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc_fitpc2_wdt.c:78:8-24: WARNING: fitpc2_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sb_wdog.c:108:1-17: WARNING: sbwdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sc1200wdt.c:181:8-24: WARNING: sc1200wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sc520_wdt.c:261:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sch311x_wdt.c:319:8-24: WARNING: sch311x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/scx200_wdt.c:105:8-24: WARNING: scx200_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/smsc37b787_wdt.c:369:8-24: WARNING: wb_smsc_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/w83877f_wdt.c:227:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/w83977f_wdt.c:301:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wafer5823wdt.c:200:8-24: WARNING: wafwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/watchdog_dev.c:828:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdrtas.c:379:8-24: WARNING: wdrtas_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdrtas.c:445:8-24: WARNING: wdrtas_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt285.c:104:1-17: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt977.c:276:8-24: WARNING: wdt977_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt.c:424:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt.c:484:8-24: WARNING: wdt_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt_pci.c:464:8-24: WARNING: wdtpci_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt_pci.c:527:8-24: WARNING: wdtpci_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. net/batman-adv/log.c:105:1-17: WARNING: batadv_log_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. sound/core/control.c:57:7-23: WARNING: snd_ctl_f_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. sound/core/rawmidi.c:385:7-23: WARNING: snd_rawmidi_f_ops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. sound/core/seq/seq_clientmgr.c:310:7-23: WARNING: snd_seq_f_ops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. sound/core/timer.c:1428:7-23: WARNING: snd_timer_f_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. One can also recheck/review the patch via generating it with explanation comments included via $ make coccicheck MODE=patch COCCI=scripts/coccinelle/api/stream_open.cocci SPFLAGS="-D explain" (*) This second group also contains cases with read/write deadlocks that stream_open.cocci don't yet detect, but which are still valid to convert to stream_open since ppos is not used. For example drivers/pci/switch/switchtec.c calls wait_for_completion_interruptible() in its .read, but stream_open.cocci currently detects only "wait_event*" as blocking. Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yongzhi Pan <panyongzhi@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Juergen Gross <jgross@suse.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Tejun Heo <tj@kernel.org> Cc: Kirill Tkhai <ktkhai@virtuozzo.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Nikolaus Rath <Nikolaus@rath.org> Cc: Han-Wen Nienhuys <hanwen@google.com> Cc: Anatolij Gustschin <agust@denx.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James R. Van Zandt" <jrv@vanzandt.mv.com> Cc: Corey Minyard <minyard@acm.org> Cc: Harald Welte <laforge@gnumonks.org> Acked-by: Lubomir Rintel <lkundrak@v3.sk> [scr24x_cs] Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Johan Hovold <johan@kernel.org> Cc: David Herrmann <dh.herrmann@googlemail.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Jean Delvare <jdelvare@suse.com> Acked-by: Guenter Roeck <linux@roeck-us.net> [watchdog/* hwmon/*] Cc: Rudolf Marek <r.marek@assembler.cz> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com> Acked-by: Logan Gunthorpe <logang@deltatee.com> [drivers/pci/switch/switchtec] Acked-by: Bjorn Helgaas <bhelgaas@google.com> [drivers/pci/switch/switchtec] Cc: Benson Leung <bleung@chromium.org> Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> [platform/chrome] Cc: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> [rtc/*] Cc: Mark Brown <broonie@kernel.org> Cc: Wim Van Sebroeck <wim@linux-watchdog.org> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Zwane Mwaikambo <zwanem@gmail.com> Cc: Marek Lindner <mareklindner@neomailbox.ch> Cc: Simon Wunderlich <sw@simonwunderlich.de> Cc: Antonio Quartulli <a@unstable.cc> Cc: "David S. Miller" <davem@davemloft.net> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Signed-off-by: Kirill Smelkov <kirr@nexedi.com>
455 lines
10 KiB
C
455 lines
10 KiB
C
/*
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* IT8712F "Smart Guardian" Watchdog support
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*
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* Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <jorge@dti2.net>
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*
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* Based on info and code taken from:
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*
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* drivers/char/watchdog/scx200_wdt.c
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* drivers/hwmon/it87.c
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* IT8712F EC-LPC I/O Preliminary Specification 0.8.2
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* IT8712F EC-LPC I/O Preliminary Specification 0.9.3
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* The author(s) of this software shall not be held liable for damages
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* of any nature resulting due to the use of this software. This
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* software is provided AS-IS with no warranties.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#define DEBUG
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#define NAME "it8712f_wdt"
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MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
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MODULE_DESCRIPTION("IT8712F Watchdog Driver");
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MODULE_LICENSE("GPL");
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static int max_units = 255;
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static int margin = 60; /* in seconds */
|
|
module_param(margin, int, 0);
|
|
MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
|
|
|
|
static unsigned long wdt_open;
|
|
static unsigned expect_close;
|
|
static unsigned char revision;
|
|
|
|
/* Dog Food address - We use the game port address */
|
|
static unsigned short address;
|
|
|
|
#define REG 0x2e /* The register to read/write */
|
|
#define VAL 0x2f /* The value to read/write */
|
|
|
|
#define LDN 0x07 /* Register: Logical device select */
|
|
#define DEVID 0x20 /* Register: Device ID */
|
|
#define DEVREV 0x22 /* Register: Device Revision */
|
|
#define ACT_REG 0x30 /* LDN Register: Activation */
|
|
#define BASE_REG 0x60 /* LDN Register: Base address */
|
|
|
|
#define IT8712F_DEVID 0x8712
|
|
|
|
#define LDN_GPIO 0x07 /* GPIO and Watch Dog Timer */
|
|
#define LDN_GAME 0x09 /* Game Port */
|
|
|
|
#define WDT_CONTROL 0x71 /* WDT Register: Control */
|
|
#define WDT_CONFIG 0x72 /* WDT Register: Configuration */
|
|
#define WDT_TIMEOUT 0x73 /* WDT Register: Timeout Value */
|
|
|
|
#define WDT_RESET_GAME 0x10 /* Reset timer on read or write to game port */
|
|
#define WDT_RESET_KBD 0x20 /* Reset timer on keyboard interrupt */
|
|
#define WDT_RESET_MOUSE 0x40 /* Reset timer on mouse interrupt */
|
|
#define WDT_RESET_CIR 0x80 /* Reset timer on consumer IR interrupt */
|
|
|
|
#define WDT_UNIT_SEC 0x80 /* If 0 in MINUTES */
|
|
|
|
#define WDT_OUT_PWROK 0x10 /* Pulse PWROK on timeout */
|
|
#define WDT_OUT_KRST 0x40 /* Pulse reset on timeout */
|
|
|
|
static int wdt_control_reg = WDT_RESET_GAME;
|
|
module_param(wdt_control_reg, int, 0);
|
|
MODULE_PARM_DESC(wdt_control_reg, "Value to write to watchdog control "
|
|
"register. The default WDT_RESET_GAME resets the timer on "
|
|
"game port reads that this driver generates. You can also "
|
|
"use KBD, MOUSE or CIR if you have some external way to "
|
|
"generate those interrupts.");
|
|
|
|
static int superio_inb(int reg)
|
|
{
|
|
outb(reg, REG);
|
|
return inb(VAL);
|
|
}
|
|
|
|
static void superio_outb(int val, int reg)
|
|
{
|
|
outb(reg, REG);
|
|
outb(val, VAL);
|
|
}
|
|
|
|
static int superio_inw(int reg)
|
|
{
|
|
int val;
|
|
outb(reg++, REG);
|
|
val = inb(VAL) << 8;
|
|
outb(reg, REG);
|
|
val |= inb(VAL);
|
|
return val;
|
|
}
|
|
|
|
static inline void superio_select(int ldn)
|
|
{
|
|
outb(LDN, REG);
|
|
outb(ldn, VAL);
|
|
}
|
|
|
|
static inline int superio_enter(void)
|
|
{
|
|
/*
|
|
* Try to reserve REG and REG + 1 for exclusive access.
|
|
*/
|
|
if (!request_muxed_region(REG, 2, NAME))
|
|
return -EBUSY;
|
|
|
|
outb(0x87, REG);
|
|
outb(0x01, REG);
|
|
outb(0x55, REG);
|
|
outb(0x55, REG);
|
|
return 0;
|
|
}
|
|
|
|
static inline void superio_exit(void)
|
|
{
|
|
outb(0x02, REG);
|
|
outb(0x02, VAL);
|
|
release_region(REG, 2);
|
|
}
|
|
|
|
static inline void it8712f_wdt_ping(void)
|
|
{
|
|
if (wdt_control_reg & WDT_RESET_GAME)
|
|
inb(address);
|
|
}
|
|
|
|
static void it8712f_wdt_update_margin(void)
|
|
{
|
|
int config = WDT_OUT_KRST | WDT_OUT_PWROK;
|
|
int units = margin;
|
|
|
|
/* Switch to minutes precision if the configured margin
|
|
* value does not fit within the register width.
|
|
*/
|
|
if (units <= max_units) {
|
|
config |= WDT_UNIT_SEC; /* else UNIT is MINUTES */
|
|
pr_info("timer margin %d seconds\n", units);
|
|
} else {
|
|
units /= 60;
|
|
pr_info("timer margin %d minutes\n", units);
|
|
}
|
|
superio_outb(config, WDT_CONFIG);
|
|
|
|
if (revision >= 0x08)
|
|
superio_outb(units >> 8, WDT_TIMEOUT + 1);
|
|
superio_outb(units, WDT_TIMEOUT);
|
|
}
|
|
|
|
static int it8712f_wdt_get_status(void)
|
|
{
|
|
if (superio_inb(WDT_CONTROL) & 0x01)
|
|
return WDIOF_CARDRESET;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int it8712f_wdt_enable(void)
|
|
{
|
|
int ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
|
|
pr_debug("enabling watchdog timer\n");
|
|
superio_select(LDN_GPIO);
|
|
|
|
superio_outb(wdt_control_reg, WDT_CONTROL);
|
|
|
|
it8712f_wdt_update_margin();
|
|
|
|
superio_exit();
|
|
|
|
it8712f_wdt_ping();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int it8712f_wdt_disable(void)
|
|
{
|
|
int ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
|
|
pr_debug("disabling watchdog timer\n");
|
|
superio_select(LDN_GPIO);
|
|
|
|
superio_outb(0, WDT_CONFIG);
|
|
superio_outb(0, WDT_CONTROL);
|
|
if (revision >= 0x08)
|
|
superio_outb(0, WDT_TIMEOUT + 1);
|
|
superio_outb(0, WDT_TIMEOUT);
|
|
|
|
superio_exit();
|
|
return 0;
|
|
}
|
|
|
|
static int it8712f_wdt_notify(struct notifier_block *this,
|
|
unsigned long code, void *unused)
|
|
{
|
|
if (code == SYS_HALT || code == SYS_POWER_OFF)
|
|
if (!nowayout)
|
|
it8712f_wdt_disable();
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block it8712f_wdt_notifier = {
|
|
.notifier_call = it8712f_wdt_notify,
|
|
};
|
|
|
|
static ssize_t it8712f_wdt_write(struct file *file, const char __user *data,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
/* check for a magic close character */
|
|
if (len) {
|
|
size_t i;
|
|
|
|
it8712f_wdt_ping();
|
|
|
|
expect_close = 0;
|
|
for (i = 0; i < len; ++i) {
|
|
char c;
|
|
if (get_user(c, data + i))
|
|
return -EFAULT;
|
|
if (c == 'V')
|
|
expect_close = 42;
|
|
}
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static long it8712f_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
int __user *p = argp;
|
|
static const struct watchdog_info ident = {
|
|
.identity = "IT8712F Watchdog",
|
|
.firmware_version = 1,
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
|
|
WDIOF_MAGICCLOSE,
|
|
};
|
|
int value;
|
|
int ret;
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
if (copy_to_user(argp, &ident, sizeof(ident)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case WDIOC_GETSTATUS:
|
|
ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
superio_select(LDN_GPIO);
|
|
|
|
value = it8712f_wdt_get_status();
|
|
|
|
superio_exit();
|
|
|
|
return put_user(value, p);
|
|
case WDIOC_GETBOOTSTATUS:
|
|
return put_user(0, p);
|
|
case WDIOC_KEEPALIVE:
|
|
it8712f_wdt_ping();
|
|
return 0;
|
|
case WDIOC_SETTIMEOUT:
|
|
if (get_user(value, p))
|
|
return -EFAULT;
|
|
if (value < 1)
|
|
return -EINVAL;
|
|
if (value > (max_units * 60))
|
|
return -EINVAL;
|
|
margin = value;
|
|
ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
superio_select(LDN_GPIO);
|
|
|
|
it8712f_wdt_update_margin();
|
|
|
|
superio_exit();
|
|
it8712f_wdt_ping();
|
|
/* Fall through */
|
|
case WDIOC_GETTIMEOUT:
|
|
if (put_user(margin, p))
|
|
return -EFAULT;
|
|
return 0;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
static int it8712f_wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret;
|
|
/* only allow one at a time */
|
|
if (test_and_set_bit(0, &wdt_open))
|
|
return -EBUSY;
|
|
|
|
ret = it8712f_wdt_enable();
|
|
if (ret)
|
|
return ret;
|
|
return stream_open(inode, file);
|
|
}
|
|
|
|
static int it8712f_wdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
if (expect_close != 42) {
|
|
pr_warn("watchdog device closed unexpectedly, will not disable the watchdog timer\n");
|
|
} else if (!nowayout) {
|
|
if (it8712f_wdt_disable())
|
|
pr_warn("Watchdog disable failed\n");
|
|
}
|
|
expect_close = 0;
|
|
clear_bit(0, &wdt_open);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations it8712f_wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = it8712f_wdt_write,
|
|
.unlocked_ioctl = it8712f_wdt_ioctl,
|
|
.open = it8712f_wdt_open,
|
|
.release = it8712f_wdt_release,
|
|
};
|
|
|
|
static struct miscdevice it8712f_wdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &it8712f_wdt_fops,
|
|
};
|
|
|
|
static int __init it8712f_wdt_find(unsigned short *address)
|
|
{
|
|
int err = -ENODEV;
|
|
int chip_type;
|
|
int ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
|
|
chip_type = superio_inw(DEVID);
|
|
if (chip_type != IT8712F_DEVID)
|
|
goto exit;
|
|
|
|
superio_select(LDN_GAME);
|
|
superio_outb(1, ACT_REG);
|
|
if (!(superio_inb(ACT_REG) & 0x01)) {
|
|
pr_err("Device not activated, skipping\n");
|
|
goto exit;
|
|
}
|
|
|
|
*address = superio_inw(BASE_REG);
|
|
if (*address == 0) {
|
|
pr_err("Base address not set, skipping\n");
|
|
goto exit;
|
|
}
|
|
|
|
err = 0;
|
|
revision = superio_inb(DEVREV) & 0x0f;
|
|
|
|
/* Later revisions have 16-bit values per datasheet 0.9.1 */
|
|
if (revision >= 0x08)
|
|
max_units = 65535;
|
|
|
|
if (margin > (max_units * 60))
|
|
margin = (max_units * 60);
|
|
|
|
pr_info("Found IT%04xF chip revision %d - using DogFood address 0x%x\n",
|
|
chip_type, revision, *address);
|
|
|
|
exit:
|
|
superio_exit();
|
|
return err;
|
|
}
|
|
|
|
static int __init it8712f_wdt_init(void)
|
|
{
|
|
int err = 0;
|
|
|
|
if (it8712f_wdt_find(&address))
|
|
return -ENODEV;
|
|
|
|
if (!request_region(address, 1, "IT8712F Watchdog")) {
|
|
pr_warn("watchdog I/O region busy\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
err = it8712f_wdt_disable();
|
|
if (err) {
|
|
pr_err("unable to disable watchdog timer\n");
|
|
goto out;
|
|
}
|
|
|
|
err = register_reboot_notifier(&it8712f_wdt_notifier);
|
|
if (err) {
|
|
pr_err("unable to register reboot notifier\n");
|
|
goto out;
|
|
}
|
|
|
|
err = misc_register(&it8712f_wdt_miscdev);
|
|
if (err) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, err);
|
|
goto reboot_out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
reboot_out:
|
|
unregister_reboot_notifier(&it8712f_wdt_notifier);
|
|
out:
|
|
release_region(address, 1);
|
|
return err;
|
|
}
|
|
|
|
static void __exit it8712f_wdt_exit(void)
|
|
{
|
|
misc_deregister(&it8712f_wdt_miscdev);
|
|
unregister_reboot_notifier(&it8712f_wdt_notifier);
|
|
release_region(address, 1);
|
|
}
|
|
|
|
module_init(it8712f_wdt_init);
|
|
module_exit(it8712f_wdt_exit);
|