linux.git/drivers/xen/mcelog.c, branch v6.9.4

xen/mcelog: add PPIN to record when available

2019-11-14T09:01:57+00:00

This is to augment commit 3f5a7896a5 ("x86/mce: Include the PPIN in MCE
records when available").

I'm also adding "synd" and "ipid" fields to struct xen_mce, in an
attempt to keep field offsets in sync with struct mce. These two fields
won't get populated for now, though.

Signed-off-by: Jan Beulich 
Reviewed-by: Boris Ostrovsky 
Signed-off-by: Juergen Gross

xen/mcelog: drop __MC_MSR_MCGCAP

2019-11-14T08:45:32+00:00

It has never been part of Xen's public interface, and there's therefore
no guarantee for MCG_CAP's value to always be present in array entry 0.

Signed-off-by: Jan Beulich 
Reviewed-by: Boris Ostrovsky 
Signed-off-by: Juergen Gross

xen/mcelog: eliminate redundant setting of interface version

2018-08-20T18:46:18+00:00

This already gets done in HYPERVISOR_mca().

Signed-off-by: Jan Beulich 
Reviewed-by: Juergen Gross 
Signed-off-by: Boris Ostrovsky

vfs: do bulk POLL* -> EPOLL* replacement

2018-02-11T22:34:03+00:00

This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:

    for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
        L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
        for f in $L; do sed -i "-es/^\([^\"]*\)\(\\)/\\1E\\2/" $f; done
    done

with de-mangling cleanups yet to come.

NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do.  But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.

The next patch from Al will sort out the final differences, and we
should be all done.

Scripted-by: Al Viro 
Signed-off-by: Linus Torvalds

the rest of drivers/*: annotate ->poll() instances

2017-11-28T16:06:58+00:00

Signed-off-by: Al Viro

x86/MCE, xen/mcelog: Make /dev/mcelog registration messages more precise

2017-06-20T21:25:19+00:00

When running under Xen as dom0, /dev/mcelog is being provided by Xen
instead of the normal mcelog character device of the MCE core. Convert
an error message being issued by the MCE core in this case to an
informative message that Xen has registered the device.

Signed-off-by: Juergen Gross 
Signed-off-by: Borislav Petkov 
Signed-off-by: Thomas Gleixner 
Cc: xen-devel@lists.xenproject.org
Cc: Tony Luck 
Cc: linux-edac 
Link: http://lkml.kernel.org/r/20170614084059.19294-1-jgross@suse.com

xen/mce: fix up xen_late_init_mcelog() error handling

2015-03-16T14:49:15+00:00

Static checkers complain about the missing call to misc_deregister() if
bind_virq_for_mce() fails.

Also I reversed the tests so that we do error handling instead of
success handling.  That way we just have a series of function calls
instead of the more complicated nested if statements in the original
code.  Let's preserve the error codes as well.

Signed-off-by: Dan Carpenter 
Reviewed-by: Konrad Rzeszutek Wilk 
Signed-off-by: David Vrabel

xen: Convert printks to pr_

2013-06-28T15:19:58+00:00

Convert printks to pr_ (excludes printk(KERN_DEBUG...)
to be more consistent throughout the xen subsystem.

Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME
Coalesce formats and add missing word spaces
Add missing newlines
Align arguments and reflow to 80 columns
Remove DRV_NAME from formats as pr_fmt adds the same content

This does change some of the prefixes of these messages
but it also does make them more consistent.

Signed-off-by: Joe Perches 
Signed-off-by: Konrad Rzeszutek Wilk

xen/mce: add .poll method for mcelog device driver

2012-07-19T19:51:41+00:00

If a driver leaves its poll method NULL, the device is assumed to
be both readable and writable without blocking.

This patch add .poll method to xen mcelog device driver, so that
when mcelog use system calls like ppoll or select, it would be
blocked when no data available, and avoid spinning at CPU.

Reported-by: Konrad Rzeszutek Wilk 
Signed-off-by: Liu, Jinsong 
Signed-off-by: Konrad Rzeszutek Wilk

xen/mce: schedule a workqueue to avoid sleep in atomic context

2012-07-19T19:51:40+00:00

copy_to_user might sleep and print a stack trace if it is executed
in an atomic spinlock context. Like this:

(XEN) CMCI: send CMCI to DOM0 through virq
BUG: sleeping function called from invalid context at /home/konradinux/kernel.h:199
in_atomic(): 1, irqs_disabled(): 0, pid: 4581, name: mcelog
Pid: 4581, comm: mcelog Tainted: G           O 3.5.0-rc1upstream-00003-g149000b-dirty #1
 [] __might_sleep+0xda/0x100
 [] xen_mce_chrdev_read+0xab/0x140
 [] vfs_read+0xc5/0x190
 [] sys_read+0x4c/0x90
 [] system_call_fastpath+0x16

This patch schedule a workqueue for IRQ handler to poll the data,
and use mutex instead of spinlock, so copy_to_user sleep in atomic
context would not occur.

Reported-by: Konrad Rzeszutek Wilk 
Suggested-by: Konrad Rzeszutek Wilk 
Signed-off-by: Liu, Jinsong 
Signed-off-by: Konrad Rzeszutek Wilk