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From: Daniel Vetter <daniel@ffwll.ch>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Daniel Vetter" <daniel.vetter@ffwll.ch>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org,
	"DRI Development" <dri-devel@lists.freedesktop.org>,
	"Intel Graphics Development" <intel-gfx@lists.freedesktop.org>,
	"Ralph Campbell" <rcampbell@nvidia.com>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Dan Carpenter" <dan.carpenter@oracle.com>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Balbir Singh" <bsingharora@gmail.com>,
	"Ira Weiny" <ira.weiny@intel.com>,
	"Souptick Joarder" <jrdr.linux@gmail.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Daniel Vetter" <daniel.vetter@intel.com>
Subject: Re: [PATCH 5/5] mm/hmm: WARN on illegal ->sync_cpu_device_pagetables errors
Date: Thu, 15 Aug 2019 09:14:15 +0200
Message-ID: <20190815071415.GD7444@phenom.ffwll.local> (raw)
In-Reply-To: <20190815001137.GE11200@ziepe.ca>

On Wed, Aug 14, 2019 at 09:11:37PM -0300, Jason Gunthorpe wrote:
> On Wed, Aug 14, 2019 at 10:20:27PM +0200, Daniel Vetter wrote:
> > Similar to the warning in the mmu notifer, warning if an hmm mirror
> > callback gets it's blocking vs. nonblocking handling wrong, or if it
> > fails with anything else than -EAGAIN.
> > 
> > Cc: Jason Gunthorpe <jgg@ziepe.ca>
> > Cc: Ralph Campbell <rcampbell@nvidia.com>
> > Cc: John Hubbard <jhubbard@nvidia.com>
> > Cc: Dan Williams <dan.j.williams@intel.com>
> > Cc: Dan Carpenter <dan.carpenter@oracle.com>
> > Cc: Matthew Wilcox <willy@infradead.org>
> > Cc: Arnd Bergmann <arnd@arndb.de>
> > Cc: Balbir Singh <bsingharora@gmail.com>
> > Cc: Ira Weiny <ira.weiny@intel.com>
> > Cc: Souptick Joarder <jrdr.linux@gmail.com>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: "Jérôme Glisse" <jglisse@redhat.com>
> > Cc: linux-mm@kvack.org
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> >  mm/hmm.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/mm/hmm.c b/mm/hmm.c
> > index 16b6731a34db..52ac59384268 100644
> > +++ b/mm/hmm.c
> > @@ -205,6 +205,9 @@ static int hmm_invalidate_range_start(struct mmu_notifier *mn,
> >  			ret = -EAGAIN;
> >  			break;
> >  		}
> > +		WARN(ret, "%pS callback failed with %d in %sblockable context\n",
> > +		     mirror->ops->sync_cpu_device_pagetables, ret,
> > +		     update.blockable ? "" : "non-");
> >  	}
> >  	up_read(&hmm->mirrors_sem);
> 
> Didn't I beat you to this?

Very much possible, I think I didn't rebase this to linux-next before
resending ... have an

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

in case you need.

Cheers, Daniel

> 
> 	list_for_each_entry(mirror, &hmm->mirrors, list) {
> 		int rc;
> 
> 		rc = mirror->ops->sync_cpu_device_pagetables(mirror, &update);
> 		if (rc) {
> 			if (WARN_ON(update.blockable || rc != -EAGAIN))
> 				continue;
> 			ret = -EAGAIN;
> 			break;
> 		}
> 	}
> 
> Thanks,
> Jason

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch


      reply index

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14 20:20 [PATCH 0/5] hmm & mmu_notifier debug/lockdep annotations Daniel Vetter
2019-08-14 20:20 ` [PATCH 1/5] mm: Check if mmu notifier callbacks are allowed to fail Daniel Vetter
2019-08-14 22:14   ` Andrew Morton
2019-08-14 23:22     ` Jason Gunthorpe
2019-08-14 23:34     ` Ralph Campbell
2019-08-16 17:19   ` Jason Gunthorpe
2019-08-14 20:20 ` [PATCH 2/5] kernel.h: Add non_block_start/end() Daniel Vetter
2019-08-14 20:45   ` Andrew Morton
2019-08-15  6:52     ` Daniel Vetter
2019-08-15  8:44     ` Michal Hocko
2019-08-15 13:04       ` Jason Gunthorpe
2019-08-15 13:12         ` Daniel Vetter
2019-08-15 14:37           ` Jason Gunthorpe
2019-08-15 14:43             ` Daniel Vetter
2019-08-15 15:10               ` Jason Gunthorpe
2019-08-15 16:25                 ` Daniel Vetter
2019-08-15 17:35                   ` Jason Gunthorpe
2019-08-15 17:39                     ` Jerome Glisse
2019-08-15 18:01                       ` Jason Gunthorpe
2019-08-15 18:27                         ` Jerome Glisse
2019-08-15 18:57                           ` Jason Gunthorpe
2019-08-15 16:32                 ` Jerome Glisse
2019-08-15 17:16                   ` Jason Gunthorpe
2019-08-15 17:21                     ` Daniel Vetter
2019-08-15 17:35                       ` Jerome Glisse
2019-08-15 13:24         ` Michal Hocko
2019-08-15 22:15       ` Andrew Morton
2019-08-16  8:24         ` Michal Hocko
2019-08-14 23:58   ` Jason Gunthorpe
2019-08-15  6:58     ` Daniel Vetter
2019-08-15 12:23       ` Jason Gunthorpe
2019-08-15 13:21         ` Michal Hocko
2019-08-15 14:12           ` Jason Gunthorpe
2019-08-15 16:00             ` Michal Hocko
2019-08-15 16:56               ` Jason Gunthorpe
2019-08-15 17:11                 ` Jerome Glisse
2019-08-15 17:17                   ` Jason Gunthorpe
2019-08-15 17:42                 ` Michal Hocko
2019-08-15 17:57                   ` Jerome Glisse
2019-08-15 18:24                   ` Jason Gunthorpe
2019-08-15 19:05                     ` Michal Hocko
2019-08-15 19:18                       ` Jason Gunthorpe
2019-08-15 19:35                         ` Michal Hocko
2019-08-15 20:13                           ` Jason Gunthorpe
2019-08-16  8:10                             ` Michal Hocko
2019-08-16 12:19                               ` Jason Gunthorpe
2019-08-16 12:26                                 ` Michal Hocko
2019-08-15 20:16                           ` [Intel-gfx] " Daniel Vetter
2019-08-15 20:27                             ` Jason Gunthorpe
2019-08-15 20:49                               ` Daniel Vetter
2019-08-16  1:00                                 ` Jason Gunthorpe
2019-08-16  6:20                                   ` Daniel Vetter
2019-08-16 12:12                                     ` Jason Gunthorpe
2019-08-16 14:11                                       ` Daniel Vetter
2019-08-16 14:38                                         ` Jason Gunthorpe
2019-08-16 16:36                                           ` Daniel Vetter
2019-08-16 16:54                                             ` Jason Gunthorpe
2019-08-16  8:27                             ` Michal Hocko
2019-08-14 20:20 ` [PATCH 3/5] mm, notifier: Catch sleeping/blocking for !blockable Daniel Vetter
2019-08-15  0:00   ` Jason Gunthorpe
2019-08-15  7:02     ` Daniel Vetter
     [not found]       ` <20190815123556.GB21596@ziepe.ca>
2019-08-17 16:09         ` Daniel Vetter
2019-08-14 20:20 ` [PATCH 4/5] mm, notifier: Add a lockdep map for invalidate_range_start Daniel Vetter
2019-08-15  0:09   ` Jason Gunthorpe
2019-08-15  7:10     ` Daniel Vetter
2019-08-15 12:53       ` Jason Gunthorpe
2019-08-14 20:20 ` [PATCH 5/5] mm/hmm: WARN on illegal ->sync_cpu_device_pagetables errors Daniel Vetter
2019-08-15  0:11   ` Jason Gunthorpe
2019-08-15  7:14     ` Daniel Vetter [this message]

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