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Date: Mon, 10 Jun 2024 20:52:11 +0000
From: "Souza, Jose" <jose.souza@...el.com>
To: "Vivi, Rodrigo" <rodrigo.vivi@...el.com>, "Cavitt, Jonathan"
<jonathan.cavitt@...el.com>
CC: "intel-xe@...ts.freedesktop.org" <intel-xe@...ts.freedesktop.org>,
"quic_mojha@...cinc.com" <quic_mojha@...cinc.com>,
"johannes@...solutions.net" <johannes@...solutions.net>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] devcoredump: Add dev_coredumpm_timeout()
On Mon, 2024-06-10 at 20:42 +0000, Cavitt, Jonathan wrote:
> -----Original Message-----
> From: Vivi, Rodrigo <rodrigo.vivi@...el.com>
> Sent: Monday, June 10, 2024 1:16 PM
> To: Souza, Jose <jose.souza@...el.com>
> Cc: linux-kernel@...r.kernel.org; intel-xe@...ts.freedesktop.org; Mukesh Ojha <quic_mojha@...cinc.com>; Johannes Berg <johannes@...solutions.net>; Cavitt, Jonathan <jonathan.cavitt@...el.com>
> Subject: Re: [PATCH v5 1/2] devcoredump: Add dev_coredumpm_timeout()
> >
> > On Mon, Jun 10, 2024 at 09:11:32AM -0700, José Roberto de Souza wrote:
> > > Add function to set a custom coredump timeout.
> > >
> > > For Xe driver usage, current 5 minutes timeout may be too short for
> > > users to search and understand what needs to be done to capture
> > > coredump to report bugs.
> > >
> > > We have plans to automate(distribute a udev script) it but at the end
> > > will be up to distros and users to pack it so having a option to
> > > increase the timeout is a safer option.
> > >
> > > v2:
> > > - replace dev_coredump_timeout_set() by dev_coredumpm_timeout() (Mukesh)
> > >
> > > v3:
> > > - make dev_coredumpm() static inline (Johannes)
> > >
> > > v5:
> > > - rename DEVCOREDUMP_TIMEOUT -> DEVCD_TIMEOUT to avoid redefinition
> > > in include/net/bluetooth/coredump.h
> > >
> > > Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> >
> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
> >
> > > Cc: Mukesh Ojha <quic_mojha@...cinc.com>
> > > Cc: Johannes Berg <johannes@...solutions.net>
> > > Cc: Jonathan Cavitt <jonathan.cavitt@...el.com>
> > > Acked-by: Jonathan Cavitt <jonathan.cavitt@...el.com>
> >
> > Jonathan, also ack to merge this through drm-next flow?
>
> Ack clear for drm-next flow. Actually, you can upgrade that to a
> Reviewed-by: Jonathan Cavitt <jonathan.cavitt@...el.com>
> I provided the Ack back before I knew I was allowed to provide
> Reviewed-bys, or that they were different from Acks even in my
> case. I trust that my past-self who originally reviewed this meant
> for the Ack to be a stand-in as a non-committal RB.
Thanks you both but I think we need wait for an ack from Johannes or Mukesh to merge this devcoredump patch.
On my other devcoredump patch already merged we also ask from a Greg's ack to merge it through drm-next.
>
> -Jonathan Cavitt
>
> >
> > > Signed-off-by: José Roberto de Souza <jose.souza@...el.com>
> > > ---
> > > drivers/base/devcoredump.c | 23 ++++++++--------
> > > include/linux/devcoredump.h | 54 ++++++++++++++++++++++++++++---------
> > > 2 files changed, 54 insertions(+), 23 deletions(-)
> > >
> > > diff --git a/drivers/base/devcoredump.c b/drivers/base/devcoredump.c
> > > index 82aeb09b3d1b5..c795edad1b969 100644
> > > --- a/drivers/base/devcoredump.c
> > > +++ b/drivers/base/devcoredump.c
> > > @@ -18,9 +18,6 @@ static struct class devcd_class;
> > > /* global disable flag, for security purposes */
> > > static bool devcd_disabled;
> > >
> > > -/* if data isn't read by userspace after 5 minutes then delete it */
> > > -#define DEVCD_TIMEOUT (HZ * 60 * 5)
> > > -
> > > struct devcd_entry {
> > > struct device devcd_dev;
> > > void *data;
> > > @@ -328,7 +325,8 @@ void dev_coredump_put(struct device *dev)
> > > EXPORT_SYMBOL_GPL(dev_coredump_put);
> > >
> > > /**
> > > - * dev_coredumpm - create device coredump with read/free methods
> > > + * dev_coredumpm_timeout - create device coredump with read/free methods with a
> > > + * custom timeout.
> > > * @dev: the struct device for the crashed device
> > > * @owner: the module that contains the read/free functions, use %THIS_MODULE
> > > * @data: data cookie for the @read/@...e functions
> > > @@ -336,17 +334,20 @@ EXPORT_SYMBOL_GPL(dev_coredump_put);
> > > * @gfp: allocation flags
> > > * @read: function to read from the given buffer
> > > * @free: function to free the given buffer
> > > + * @timeout: time in jiffies to remove coredump
> > > *
> > > * Creates a new device coredump for the given device. If a previous one hasn't
> > > * been read yet, the new coredump is discarded. The data lifetime is determined
> > > * by the device coredump framework and when it is no longer needed the @free
> > > * function will be called to free the data.
> > > */
> > > -void dev_coredumpm(struct device *dev, struct module *owner,
> > > - void *data, size_t datalen, gfp_t gfp,
> > > - ssize_t (*read)(char *buffer, loff_t offset, size_t count,
> > > - void *data, size_t datalen),
> > > - void (*free)(void *data))
> > > +void dev_coredumpm_timeout(struct device *dev, struct module *owner,
> > > + void *data, size_t datalen, gfp_t gfp,
> > > + ssize_t (*read)(char *buffer, loff_t offset,
> > > + size_t count, void *data,
> > > + size_t datalen),
> > > + void (*free)(void *data),
> > > + unsigned long timeout)
> > > {
> > > static atomic_t devcd_count = ATOMIC_INIT(0);
> > > struct devcd_entry *devcd;
> > > @@ -403,7 +404,7 @@ void dev_coredumpm(struct device *dev, struct module *owner,
> > > dev_set_uevent_suppress(&devcd->devcd_dev, false);
> > > kobject_uevent(&devcd->devcd_dev.kobj, KOBJ_ADD);
> > > INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
> > > - schedule_delayed_work(&devcd->del_wk, DEVCD_TIMEOUT);
> > > + schedule_delayed_work(&devcd->del_wk, timeout);
> > > mutex_unlock(&devcd->mutex);
> > > return;
> > > put_device:
> > > @@ -414,7 +415,7 @@ void dev_coredumpm(struct device *dev, struct module *owner,
> > > free:
> > > free(data);
> > > }
> > > -EXPORT_SYMBOL_GPL(dev_coredumpm);
> > > +EXPORT_SYMBOL_GPL(dev_coredumpm_timeout);
> > >
> > > /**
> > > * dev_coredumpsg - create device coredump that uses scatterlist as data
> > > diff --git a/include/linux/devcoredump.h b/include/linux/devcoredump.h
> > > index c8f7eb6cc1915..e3de1e545a4a5 100644
> > > --- a/include/linux/devcoredump.h
> > > +++ b/include/linux/devcoredump.h
> > > @@ -12,6 +12,9 @@
> > > #include <linux/scatterlist.h>
> > > #include <linux/slab.h>
> > >
> > > +/* if data isn't read by userspace after 5 minutes then delete it */
> > > +#define DEVCD_TIMEOUT (HZ * 60 * 5)
> > > +
> > > /*
> > > * _devcd_free_sgtable - free all the memory of the given scatterlist table
> > > * (i.e. both pages and scatterlist instances)
> > > @@ -50,16 +53,17 @@ static inline void _devcd_free_sgtable(struct scatterlist *table)
> > > kfree(delete_iter);
> > > }
> > >
> > > -
> > > #ifdef CONFIG_DEV_COREDUMP
> > > void dev_coredumpv(struct device *dev, void *data, size_t datalen,
> > > gfp_t gfp);
> > >
> > > -void dev_coredumpm(struct device *dev, struct module *owner,
> > > - void *data, size_t datalen, gfp_t gfp,
> > > - ssize_t (*read)(char *buffer, loff_t offset, size_t count,
> > > - void *data, size_t datalen),
> > > - void (*free)(void *data));
> > > +void dev_coredumpm_timeout(struct device *dev, struct module *owner,
> > > + void *data, size_t datalen, gfp_t gfp,
> > > + ssize_t (*read)(char *buffer, loff_t offset,
> > > + size_t count, void *data,
> > > + size_t datalen),
> > > + void (*free)(void *data),
> > > + unsigned long timeout);
> > >
> > > void dev_coredumpsg(struct device *dev, struct scatterlist *table,
> > > size_t datalen, gfp_t gfp);
> > > @@ -72,12 +76,13 @@ static inline void dev_coredumpv(struct device *dev, void *data,
> > > vfree(data);
> > > }
> > >
> > > -static inline void
> > > -dev_coredumpm(struct device *dev, struct module *owner,
> > > - void *data, size_t datalen, gfp_t gfp,
> > > - ssize_t (*read)(char *buffer, loff_t offset, size_t count,
> > > - void *data, size_t datalen),
> > > - void (*free)(void *data))
> > > +void dev_coredumpm_timeout(struct device *dev, struct module *owner,
> > > + void *data, size_t datalen, gfp_t gfp,
> > > + ssize_t (*read)(char *buffer, loff_t offset,
> > > + size_t count, void *data,
> > > + size_t datalen),
> > > + void (*free)(void *data),
> > > + unsigned long timeout)
> > > {
> > > free(data);
> > > }
> > > @@ -92,4 +97,29 @@ static inline void dev_coredump_put(struct device *dev)
> > > }
> > > #endif /* CONFIG_DEV_COREDUMP */
> > >
> > > +/**
> > > + * dev_coredumpm - create device coredump with read/free methods
> > > + * @dev: the struct device for the crashed device
> > > + * @owner: the module that contains the read/free functions, use %THIS_MODULE
> > > + * @data: data cookie for the @read/@...e functions
> > > + * @datalen: length of the data
> > > + * @gfp: allocation flags
> > > + * @read: function to read from the given buffer
> > > + * @free: function to free the given buffer
> > > + *
> > > + * Creates a new device coredump for the given device. If a previous one hasn't
> > > + * been read yet, the new coredump is discarded. The data lifetime is determined
> > > + * by the device coredump framework and when it is no longer needed the @free
> > > + * function will be called to free the data.
> > > + */
> > > +static inline void dev_coredumpm(struct device *dev, struct module *owner,
> > > + void *data, size_t datalen, gfp_t gfp,
> > > + ssize_t (*read)(char *buffer, loff_t offset, size_t count,
> > > + void *data, size_t datalen),
> > > + void (*free)(void *data))
> > > +{
> > > + dev_coredumpm_timeout(dev, owner, data, datalen, gfp, read, free,
> > > + DEVCD_TIMEOUT);
> > > +}
> > > +
> > > #endif /* __DEVCOREDUMP_H */
> > > --
> > > 2.45.2
> > >
> >
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