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c5bf68fe0c
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>
422 lines
9.4 KiB
C
422 lines
9.4 KiB
C
/*
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* IBM Automatic Server Restart driver.
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*
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* Copyright (c) 2005 Andrey Panin <pazke@donpac.ru>
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*
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* Based on driver written by Pete Reynolds.
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* Copyright (c) IBM Corporation, 1998-2004.
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*
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* This software may be used and distributed according to the terms
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* of the GNU Public License, incorporated herein by reference.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/timer.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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enum {
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ASMTYPE_UNKNOWN,
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ASMTYPE_TOPAZ,
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ASMTYPE_JASPER,
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ASMTYPE_PEARL,
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ASMTYPE_JUNIPER,
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ASMTYPE_SPRUCE,
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};
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#define TOPAZ_ASR_REG_OFFSET 4
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#define TOPAZ_ASR_TOGGLE 0x40
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#define TOPAZ_ASR_DISABLE 0x80
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/* PEARL ASR S/W REGISTER SUPERIO PORT ADDRESSES */
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#define PEARL_BASE 0xe04
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#define PEARL_WRITE 0xe06
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#define PEARL_READ 0xe07
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#define PEARL_ASR_DISABLE_MASK 0x80 /* bit 7: disable = 1, enable = 0 */
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#define PEARL_ASR_TOGGLE_MASK 0x40 /* bit 6: 0, then 1, then 0 */
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/* JASPER OFFSET FROM SIO BASE ADDR TO ASR S/W REGISTERS. */
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#define JASPER_ASR_REG_OFFSET 0x38
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#define JASPER_ASR_DISABLE_MASK 0x01 /* bit 0: disable = 1, enable = 0 */
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#define JASPER_ASR_TOGGLE_MASK 0x02 /* bit 1: 0, then 1, then 0 */
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#define JUNIPER_BASE_ADDRESS 0x54b /* Base address of Juniper ASR */
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#define JUNIPER_ASR_DISABLE_MASK 0x01 /* bit 0: disable = 1 enable = 0 */
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#define JUNIPER_ASR_TOGGLE_MASK 0x02 /* bit 1: 0, then 1, then 0 */
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#define SPRUCE_BASE_ADDRESS 0x118e /* Base address of Spruce ASR */
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#define SPRUCE_ASR_DISABLE_MASK 0x01 /* bit 1: disable = 1 enable = 0 */
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#define SPRUCE_ASR_TOGGLE_MASK 0x02 /* bit 0: 0, then 1, then 0 */
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static bool nowayout = WATCHDOG_NOWAYOUT;
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static unsigned long asr_is_open;
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static char asr_expect_close;
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static unsigned int asr_type, asr_base, asr_length;
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static unsigned int asr_read_addr, asr_write_addr;
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static unsigned char asr_toggle_mask, asr_disable_mask;
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static DEFINE_SPINLOCK(asr_lock);
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static void __asr_toggle(void)
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{
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unsigned char reg;
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reg = inb(asr_read_addr);
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outb(reg & ~asr_toggle_mask, asr_write_addr);
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reg = inb(asr_read_addr);
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outb(reg | asr_toggle_mask, asr_write_addr);
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reg = inb(asr_read_addr);
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outb(reg & ~asr_toggle_mask, asr_write_addr);
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reg = inb(asr_read_addr);
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}
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static void asr_toggle(void)
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{
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spin_lock(&asr_lock);
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__asr_toggle();
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spin_unlock(&asr_lock);
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}
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static void asr_enable(void)
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{
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unsigned char reg;
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spin_lock(&asr_lock);
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if (asr_type == ASMTYPE_TOPAZ) {
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/* asr_write_addr == asr_read_addr */
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reg = inb(asr_read_addr);
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outb(reg & ~(TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE),
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asr_read_addr);
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} else {
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/*
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* First make sure the hardware timer is reset by toggling
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* ASR hardware timer line.
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*/
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__asr_toggle();
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reg = inb(asr_read_addr);
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outb(reg & ~asr_disable_mask, asr_write_addr);
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}
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reg = inb(asr_read_addr);
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spin_unlock(&asr_lock);
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}
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static void asr_disable(void)
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{
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unsigned char reg;
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spin_lock(&asr_lock);
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reg = inb(asr_read_addr);
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if (asr_type == ASMTYPE_TOPAZ)
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/* asr_write_addr == asr_read_addr */
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outb(reg | TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE,
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asr_read_addr);
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else {
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outb(reg | asr_toggle_mask, asr_write_addr);
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reg = inb(asr_read_addr);
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outb(reg | asr_disable_mask, asr_write_addr);
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}
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reg = inb(asr_read_addr);
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spin_unlock(&asr_lock);
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}
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static int __init asr_get_base_address(void)
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{
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unsigned char low, high;
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const char *type = "";
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asr_length = 1;
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switch (asr_type) {
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case ASMTYPE_TOPAZ:
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/* SELECT SuperIO CHIP FOR QUERYING
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(WRITE 0x07 TO BOTH 0x2E and 0x2F) */
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outb(0x07, 0x2e);
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outb(0x07, 0x2f);
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/* SELECT AND READ THE HIGH-NIBBLE OF THE GPIO BASE ADDRESS */
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outb(0x60, 0x2e);
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high = inb(0x2f);
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/* SELECT AND READ THE LOW-NIBBLE OF THE GPIO BASE ADDRESS */
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outb(0x61, 0x2e);
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low = inb(0x2f);
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asr_base = (high << 16) | low;
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asr_read_addr = asr_write_addr =
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asr_base + TOPAZ_ASR_REG_OFFSET;
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asr_length = 5;
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break;
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case ASMTYPE_JASPER:
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type = "Jaspers ";
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#if 0
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u32 r;
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/* Suggested fix */
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pdev = pci_get_bus_and_slot(0, DEVFN(0x1f, 0));
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if (pdev == NULL)
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return -ENODEV;
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pci_read_config_dword(pdev, 0x58, &r);
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asr_base = r & 0xFFFE;
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pci_dev_put(pdev);
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#else
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/* FIXME: need to use pci_config_lock here,
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but it's not exported */
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/* spin_lock_irqsave(&pci_config_lock, flags);*/
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/* Select the SuperIO chip in the PCI I/O port register */
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outl(0x8000f858, 0xcf8);
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/* BUS 0, Slot 1F, fnc 0, offset 58 */
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/*
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* Read the base address for the SuperIO chip.
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* Only the lower 16 bits are valid, but the address is word
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* aligned so the last bit must be masked off.
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*/
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asr_base = inl(0xcfc) & 0xfffe;
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/* spin_unlock_irqrestore(&pci_config_lock, flags);*/
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#endif
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asr_read_addr = asr_write_addr =
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asr_base + JASPER_ASR_REG_OFFSET;
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asr_toggle_mask = JASPER_ASR_TOGGLE_MASK;
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asr_disable_mask = JASPER_ASR_DISABLE_MASK;
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asr_length = JASPER_ASR_REG_OFFSET + 1;
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break;
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case ASMTYPE_PEARL:
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type = "Pearls ";
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asr_base = PEARL_BASE;
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asr_read_addr = PEARL_READ;
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asr_write_addr = PEARL_WRITE;
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asr_toggle_mask = PEARL_ASR_TOGGLE_MASK;
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asr_disable_mask = PEARL_ASR_DISABLE_MASK;
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asr_length = 4;
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break;
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case ASMTYPE_JUNIPER:
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type = "Junipers ";
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asr_base = JUNIPER_BASE_ADDRESS;
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asr_read_addr = asr_write_addr = asr_base;
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asr_toggle_mask = JUNIPER_ASR_TOGGLE_MASK;
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asr_disable_mask = JUNIPER_ASR_DISABLE_MASK;
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break;
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case ASMTYPE_SPRUCE:
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type = "Spruce's ";
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asr_base = SPRUCE_BASE_ADDRESS;
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asr_read_addr = asr_write_addr = asr_base;
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asr_toggle_mask = SPRUCE_ASR_TOGGLE_MASK;
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asr_disable_mask = SPRUCE_ASR_DISABLE_MASK;
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break;
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}
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if (!request_region(asr_base, asr_length, "ibmasr")) {
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pr_err("address %#x already in use\n", asr_base);
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return -EBUSY;
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}
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pr_info("found %sASR @ addr %#x\n", type, asr_base);
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return 0;
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}
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static ssize_t asr_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if (count) {
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if (!nowayout) {
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size_t i;
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/* In case it was set long ago */
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asr_expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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asr_expect_close = 42;
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}
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}
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asr_toggle();
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}
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return count;
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}
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static long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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static const struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.identity = "IBM ASR",
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};
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int heartbeat;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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{
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int new_options, retval = -EINVAL;
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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asr_disable();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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asr_enable();
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asr_toggle();
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retval = 0;
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}
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return retval;
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}
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case WDIOC_KEEPALIVE:
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asr_toggle();
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return 0;
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/*
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* The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
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* and WDIOC_GETTIMEOUT always returns 256.
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*/
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case WDIOC_GETTIMEOUT:
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heartbeat = 256;
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return put_user(heartbeat, p);
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default:
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return -ENOTTY;
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}
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}
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static int asr_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &asr_is_open))
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return -EBUSY;
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asr_toggle();
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asr_enable();
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return stream_open(inode, file);
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}
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static int asr_release(struct inode *inode, struct file *file)
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{
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if (asr_expect_close == 42)
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asr_disable();
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else {
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pr_crit("unexpected close, not stopping watchdog!\n");
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asr_toggle();
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}
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clear_bit(0, &asr_is_open);
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asr_expect_close = 0;
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return 0;
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}
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static const struct file_operations asr_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = asr_write,
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.unlocked_ioctl = asr_ioctl,
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.open = asr_open,
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.release = asr_release,
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};
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static struct miscdevice asr_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &asr_fops,
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};
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struct ibmasr_id {
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const char *desc;
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int type;
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};
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static struct ibmasr_id ibmasr_id_table[] __initdata = {
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{ "IBM Automatic Server Restart - eserver xSeries 220", ASMTYPE_TOPAZ },
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{ "IBM Automatic Server Restart - Machine Type 8673", ASMTYPE_PEARL },
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{ "IBM Automatic Server Restart - Machine Type 8480", ASMTYPE_JASPER },
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{ "IBM Automatic Server Restart - Machine Type 8482", ASMTYPE_JUNIPER },
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{ "IBM Automatic Server Restart - Machine Type 8648", ASMTYPE_SPRUCE },
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{ NULL }
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};
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static int __init ibmasr_init(void)
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{
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struct ibmasr_id *id;
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int rc;
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for (id = ibmasr_id_table; id->desc; id++) {
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if (dmi_find_device(DMI_DEV_TYPE_OTHER, id->desc, NULL)) {
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asr_type = id->type;
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break;
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}
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}
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if (!asr_type)
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return -ENODEV;
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rc = asr_get_base_address();
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if (rc)
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return rc;
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rc = misc_register(&asr_miscdev);
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if (rc < 0) {
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release_region(asr_base, asr_length);
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pr_err("failed to register misc device\n");
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return rc;
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}
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return 0;
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}
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static void __exit ibmasr_exit(void)
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{
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if (!nowayout)
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asr_disable();
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misc_deregister(&asr_miscdev);
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release_region(asr_base, asr_length);
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}
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module_init(ibmasr_init);
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module_exit(ibmasr_exit);
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
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MODULE_AUTHOR("Andrey Panin");
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MODULE_LICENSE("GPL");
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