* [PATCH v2 06/17] compat_ioctl: move rtc handling into rtc-dev.c [not found] ` <20180912151134.436719-1-arnd@arndb.de> @ 2018-09-12 15:08 ` Arnd Bergmann 2018-09-12 20:00 ` Alexandre Belloni 0 siblings, 1 reply; 2+ messages in thread From: Arnd Bergmann @ 2018-09-12 15:08 UTC (permalink / raw) To: viro Cc: linux-fsdevel, Arnd Bergmann, Alessandro Zummo, Alexandre Belloni, linux-rtc, linux-kernel We no longer need the rtc compat handling to be in common code, now that all drivers are either moved to the rtc-class framework, or (rarely) exist in drivers/char for architectures without compat mode (m68k, alpha and ia64, respectively). I checked the list of ioctl commands in drivers, and the ones that are not already handled are all compatible, again with the one exception of m68k driver, which implements RTC_PLL_GET and RTC_PLL_SET, but has no compat mode. Since the ioctl commands are either compatible or differ in both structure and command code between 32-bit and 64-bit, we can merge the compat handler into the native one and just implement the two common compat commands (RTC_IRQP_READ, RTC_IRQP_SET) there. The old conversion handler also deals with RTC_EPOCH_READ and RTC_EPOCH_SET, which are not handled in rtc-dev.c but only in a single device driver (rtc-vr41xx), so I'm adding the compat version in the same place. I don't expect other drivers to need those commands in the future. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- v2: merge compat handler into ioctl function to avoid the compat_alloc_user_space() roundtrip, based on feedback from Al Viro. --- drivers/rtc/rtc-dev.c | 13 +++++++++- drivers/rtc/rtc-vr41xx.c | 10 ++++++++ fs/compat_ioctl.c | 54 ---------------------------------------- 3 files changed, 22 insertions(+), 55 deletions(-) diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 43d962a9c210..ccd5b1795e20 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -13,6 +13,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/compat.h> #include <linux/module.h> #include <linux/rtc.h> #include <linux/sched/signal.h> @@ -364,10 +365,19 @@ static long rtc_dev_ioctl(struct file *file, mutex_unlock(&rtc->ops_lock); return rtc_update_irq_enable(rtc, 0); +#ifdef CONFIG_COMPAT +#define RTC_IRQP_SET32 _IOW('p', 0x0c, compat_ulong_t) +#define RTC_IRQP_READ32 _IOR('p', 0x0b, compat_ulong_t) + case RTC_IRQP_SET32: + err = rtc_irq_set_freq(rtc, arg); + break; + case RTC_IRQP_READ32: + err = put_user(rtc->irq_freq, (unsigned int __user *)uarg); + break; +#endif case RTC_IRQP_SET: err = rtc_irq_set_freq(rtc, arg); break; - case RTC_IRQP_READ: err = put_user(rtc->irq_freq, (unsigned long __user *)uarg); break; @@ -439,6 +449,7 @@ static const struct file_operations rtc_dev_fops = { .read = rtc_dev_read, .poll = rtc_dev_poll, .unlocked_ioctl = rtc_dev_ioctl, + .compat_ioctl = generic_compat_ioctl_ptrarg, .open = rtc_dev_open, .release = rtc_dev_release, .fasync = rtc_dev_fasync, diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c index 70f013e692b0..1d90bde59d21 100644 --- a/drivers/rtc/rtc-vr41xx.c +++ b/drivers/rtc/rtc-vr41xx.c @@ -17,6 +17,7 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/compat.h> #include <linux/err.h> #include <linux/fs.h> #include <linux/init.h> @@ -79,6 +80,10 @@ static void __iomem *rtc2_base; #define rtc2_read(offset) readw(rtc2_base + (offset)) #define rtc2_write(offset, value) writew((value), rtc2_base + (offset)) +/* 32-bit compat for ioctls that nobody else uses */ +#define RTC_EPOCH_READ32 _IOR('p', 0x0d, compat_ulong_t) +#define RTC_EPOCH_SET32 _IOW('p', 0x0e, compat_ulong_t) + static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */ static DEFINE_SPINLOCK(rtc_lock); @@ -195,6 +200,11 @@ static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long switch (cmd) { case RTC_EPOCH_READ: return put_user(epoch, (unsigned long __user *)arg); +#ifdef CONFIG_COMPAT + case RTC_EPOCH_READ32: + return put_user(epoch, (unsigned int __user *)arg); + case RTC_EPOCH_SET32: +#endif case RTC_EPOCH_SET: /* Doesn't support before 1900 */ if (arg < 1900) diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index 2d7c7e149083..312b52b4e974 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -46,7 +46,6 @@ #include <linux/raw.h> #include <linux/blkdev.h> #include <linux/elevator.h> -#include <linux/rtc.h> #include <linux/pci.h> #include <linux/serial.h> #include <linux/if_tun.h> @@ -633,37 +632,6 @@ static int serial_struct_ioctl(struct file *file, return err; } -#define RTC_IRQP_READ32 _IOR('p', 0x0b, compat_ulong_t) -#define RTC_IRQP_SET32 _IOW('p', 0x0c, compat_ulong_t) -#define RTC_EPOCH_READ32 _IOR('p', 0x0d, compat_ulong_t) -#define RTC_EPOCH_SET32 _IOW('p', 0x0e, compat_ulong_t) - -static int rtc_ioctl(struct file *file, - unsigned cmd, void __user *argp) -{ - unsigned long __user *valp = compat_alloc_user_space(sizeof(*valp)); - int ret; - - if (valp == NULL) - return -EFAULT; - switch (cmd) { - case RTC_IRQP_READ32: - case RTC_EPOCH_READ32: - ret = do_ioctl(file, (cmd == RTC_IRQP_READ32) ? - RTC_IRQP_READ : RTC_EPOCH_READ, - (unsigned long)valp); - if (ret) - return ret; - return convert_in_user(valp, (unsigned int __user *)argp); - case RTC_IRQP_SET32: - return do_ioctl(file, RTC_IRQP_SET, (unsigned long)argp); - case RTC_EPOCH_SET32: - return do_ioctl(file, RTC_EPOCH_SET, (unsigned long)argp); - } - - return -ENOIOCTLCMD; -} - /* on ia32 l_start is on a 32-bit boundary */ #if defined(CONFIG_IA64) || defined(CONFIG_X86_64) struct space_resv_32 { @@ -816,21 +784,6 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI) /* Big V (don't complain on serial console) */ IGNORE_IOCTL(VT_OPENQRY) IGNORE_IOCTL(VT_GETMODE) -/* Little p (/dev/rtc, /dev/envctrl, etc.) */ -COMPATIBLE_IOCTL(RTC_AIE_ON) -COMPATIBLE_IOCTL(RTC_AIE_OFF) -COMPATIBLE_IOCTL(RTC_UIE_ON) -COMPATIBLE_IOCTL(RTC_UIE_OFF) -COMPATIBLE_IOCTL(RTC_PIE_ON) -COMPATIBLE_IOCTL(RTC_PIE_OFF) -COMPATIBLE_IOCTL(RTC_WIE_ON) -COMPATIBLE_IOCTL(RTC_WIE_OFF) -COMPATIBLE_IOCTL(RTC_ALM_SET) -COMPATIBLE_IOCTL(RTC_ALM_READ) -COMPATIBLE_IOCTL(RTC_RD_TIME) -COMPATIBLE_IOCTL(RTC_SET_TIME) -COMPATIBLE_IOCTL(RTC_WKALM_SET) -COMPATIBLE_IOCTL(RTC_WKALM_RD) /* * These two are only for the sbus rtc driver, but * hwclock tries them on every rtc device first when @@ -1307,13 +1260,6 @@ static long do_ioctl_trans(unsigned int cmd, case TIOCGSERIAL: case TIOCSSERIAL: return serial_struct_ioctl(file, cmd, argp); - /* Not implemented in the native kernel */ - case RTC_IRQP_READ32: - case RTC_IRQP_SET32: - case RTC_EPOCH_READ32: - case RTC_EPOCH_SET32: - return rtc_ioctl(file, cmd, argp); - /* dvb */ case VIDEO_GET_EVENT: return do_video_get_event(file, cmd, argp); -- 2.18.0 ^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2 06/17] compat_ioctl: move rtc handling into rtc-dev.c 2018-09-12 15:08 ` [PATCH v2 06/17] compat_ioctl: move rtc handling into rtc-dev.c Arnd Bergmann @ 2018-09-12 20:00 ` Alexandre Belloni 0 siblings, 0 replies; 2+ messages in thread From: Alexandre Belloni @ 2018-09-12 20:00 UTC (permalink / raw) To: Arnd Bergmann Cc: viro, linux-fsdevel, Alessandro Zummo, linux-rtc, linux-kernel On 12/09/2018 17:08:53+0200, Arnd Bergmann wrote: > We no longer need the rtc compat handling to be in common code, now that > all drivers are either moved to the rtc-class framework, or (rarely) > exist in drivers/char for architectures without compat mode (m68k, > alpha and ia64, respectively). > > I checked the list of ioctl commands in drivers, and the ones that are > not already handled are all compatible, again with the one exception of > m68k driver, which implements RTC_PLL_GET and RTC_PLL_SET, but has no > compat mode. > > Since the ioctl commands are either compatible or differ in both structure > and command code between 32-bit and 64-bit, we can merge the compat > handler into the native one and just implement the two common compat > commands (RTC_IRQP_READ, RTC_IRQP_SET) there. > > The old conversion handler also deals with RTC_EPOCH_READ and > RTC_EPOCH_SET, which are not handled in rtc-dev.c but only in > a single device driver (rtc-vr41xx), so I'm adding the compat > version in the same place. I don't expect other drivers to need > those commands in the future. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> > --- > v2: merge compat handler into ioctl function to avoid the > compat_alloc_user_space() roundtrip, based on feedback > from Al Viro. > --- > drivers/rtc/rtc-dev.c | 13 +++++++++- > drivers/rtc/rtc-vr41xx.c | 10 ++++++++ > fs/compat_ioctl.c | 54 ---------------------------------------- > 3 files changed, 22 insertions(+), 55 deletions(-) > > diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c > index 43d962a9c210..ccd5b1795e20 100644 > --- a/drivers/rtc/rtc-dev.c > +++ b/drivers/rtc/rtc-dev.c > @@ -13,6 +13,7 @@ > > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > > +#include <linux/compat.h> > #include <linux/module.h> > #include <linux/rtc.h> > #include <linux/sched/signal.h> > @@ -364,10 +365,19 @@ static long rtc_dev_ioctl(struct file *file, > mutex_unlock(&rtc->ops_lock); > return rtc_update_irq_enable(rtc, 0); > > +#ifdef CONFIG_COMPAT > +#define RTC_IRQP_SET32 _IOW('p', 0x0c, compat_ulong_t) > +#define RTC_IRQP_READ32 _IOR('p', 0x0b, compat_ulong_t) > + case RTC_IRQP_SET32: > + err = rtc_irq_set_freq(rtc, arg); > + break; > + case RTC_IRQP_READ32: > + err = put_user(rtc->irq_freq, (unsigned int __user *)uarg); > + break; > +#endif > case RTC_IRQP_SET: > err = rtc_irq_set_freq(rtc, arg); > break; > - > case RTC_IRQP_READ: > err = put_user(rtc->irq_freq, (unsigned long __user *)uarg); > break; > @@ -439,6 +449,7 @@ static const struct file_operations rtc_dev_fops = { > .read = rtc_dev_read, > .poll = rtc_dev_poll, > .unlocked_ioctl = rtc_dev_ioctl, > + .compat_ioctl = generic_compat_ioctl_ptrarg, > .open = rtc_dev_open, > .release = rtc_dev_release, > .fasync = rtc_dev_fasync, > diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c > index 70f013e692b0..1d90bde59d21 100644 > --- a/drivers/rtc/rtc-vr41xx.c > +++ b/drivers/rtc/rtc-vr41xx.c > @@ -17,6 +17,7 @@ > * along with this program; if not, write to the Free Software > * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA > */ > +#include <linux/compat.h> > #include <linux/err.h> > #include <linux/fs.h> > #include <linux/init.h> > @@ -79,6 +80,10 @@ static void __iomem *rtc2_base; > #define rtc2_read(offset) readw(rtc2_base + (offset)) > #define rtc2_write(offset, value) writew((value), rtc2_base + (offset)) > > +/* 32-bit compat for ioctls that nobody else uses */ > +#define RTC_EPOCH_READ32 _IOR('p', 0x0d, compat_ulong_t) > +#define RTC_EPOCH_SET32 _IOW('p', 0x0e, compat_ulong_t) > + > static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */ > > static DEFINE_SPINLOCK(rtc_lock); > @@ -195,6 +200,11 @@ static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long > switch (cmd) { > case RTC_EPOCH_READ: > return put_user(epoch, (unsigned long __user *)arg); > +#ifdef CONFIG_COMPAT > + case RTC_EPOCH_READ32: > + return put_user(epoch, (unsigned int __user *)arg); > + case RTC_EPOCH_SET32: > +#endif > case RTC_EPOCH_SET: > /* Doesn't support before 1900 */ > if (arg < 1900) > diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c > index 2d7c7e149083..312b52b4e974 100644 > --- a/fs/compat_ioctl.c > +++ b/fs/compat_ioctl.c > @@ -46,7 +46,6 @@ > #include <linux/raw.h> > #include <linux/blkdev.h> > #include <linux/elevator.h> > -#include <linux/rtc.h> > #include <linux/pci.h> > #include <linux/serial.h> > #include <linux/if_tun.h> > @@ -633,37 +632,6 @@ static int serial_struct_ioctl(struct file *file, > return err; > } > > -#define RTC_IRQP_READ32 _IOR('p', 0x0b, compat_ulong_t) > -#define RTC_IRQP_SET32 _IOW('p', 0x0c, compat_ulong_t) > -#define RTC_EPOCH_READ32 _IOR('p', 0x0d, compat_ulong_t) > -#define RTC_EPOCH_SET32 _IOW('p', 0x0e, compat_ulong_t) > - > -static int rtc_ioctl(struct file *file, > - unsigned cmd, void __user *argp) > -{ > - unsigned long __user *valp = compat_alloc_user_space(sizeof(*valp)); > - int ret; > - > - if (valp == NULL) > - return -EFAULT; > - switch (cmd) { > - case RTC_IRQP_READ32: > - case RTC_EPOCH_READ32: > - ret = do_ioctl(file, (cmd == RTC_IRQP_READ32) ? > - RTC_IRQP_READ : RTC_EPOCH_READ, > - (unsigned long)valp); > - if (ret) > - return ret; > - return convert_in_user(valp, (unsigned int __user *)argp); > - case RTC_IRQP_SET32: > - return do_ioctl(file, RTC_IRQP_SET, (unsigned long)argp); > - case RTC_EPOCH_SET32: > - return do_ioctl(file, RTC_EPOCH_SET, (unsigned long)argp); > - } > - > - return -ENOIOCTLCMD; > -} > - > /* on ia32 l_start is on a 32-bit boundary */ > #if defined(CONFIG_IA64) || defined(CONFIG_X86_64) > struct space_resv_32 { > @@ -816,21 +784,6 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI) > /* Big V (don't complain on serial console) */ > IGNORE_IOCTL(VT_OPENQRY) > IGNORE_IOCTL(VT_GETMODE) > -/* Little p (/dev/rtc, /dev/envctrl, etc.) */ > -COMPATIBLE_IOCTL(RTC_AIE_ON) > -COMPATIBLE_IOCTL(RTC_AIE_OFF) > -COMPATIBLE_IOCTL(RTC_UIE_ON) > -COMPATIBLE_IOCTL(RTC_UIE_OFF) > -COMPATIBLE_IOCTL(RTC_PIE_ON) > -COMPATIBLE_IOCTL(RTC_PIE_OFF) > -COMPATIBLE_IOCTL(RTC_WIE_ON) > -COMPATIBLE_IOCTL(RTC_WIE_OFF) > -COMPATIBLE_IOCTL(RTC_ALM_SET) > -COMPATIBLE_IOCTL(RTC_ALM_READ) > -COMPATIBLE_IOCTL(RTC_RD_TIME) > -COMPATIBLE_IOCTL(RTC_SET_TIME) > -COMPATIBLE_IOCTL(RTC_WKALM_SET) > -COMPATIBLE_IOCTL(RTC_WKALM_RD) > /* > * These two are only for the sbus rtc driver, but > * hwclock tries them on every rtc device first when > @@ -1307,13 +1260,6 @@ static long do_ioctl_trans(unsigned int cmd, > case TIOCGSERIAL: > case TIOCSSERIAL: > return serial_struct_ioctl(file, cmd, argp); > - /* Not implemented in the native kernel */ > - case RTC_IRQP_READ32: > - case RTC_IRQP_SET32: > - case RTC_EPOCH_READ32: > - case RTC_EPOCH_SET32: > - return rtc_ioctl(file, cmd, argp); > - > /* dvb */ > case VIDEO_GET_EVENT: > return do_video_get_event(file, cmd, argp); > -- > 2.18.0 > -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com ^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] ` <20180912151134.436719-1-arnd@arndb.de>
2018-09-12 15:08 ` [PATCH v2 06/17] compat_ioctl: move rtc handling into rtc-dev.c Arnd Bergmann
2018-09-12 20:00 ` Alexandre Belloni
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