Date: Mon, 8 Nov 2010 14:26:43 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-x11@freebsd.org, freebsd-current@freebsd.org Subject: Re: radeon_cp_texture: page fault with non-sleepable locks held Message-ID: <20101108122643.GE2392@deviant.kiev.zoral.com.ua> In-Reply-To: <4CD7E80F.4090100@freebsd.org> References: <4CD3B1D2.30003@icyb.net.ua> <4CD7E401.1010206@freebsd.org> <20101108120403.GC2392@deviant.kiev.zoral.com.ua> <4CD7E80F.4090100@freebsd.org>
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--iTK5zgLp6gXhzOi1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Nov 08, 2010 at 02:07:43PM +0200, Andriy Gapon wrote: > on 08/11/2010 14:04 Kostik Belousov said the following: > > On Mon, Nov 08, 2010 at 01:50:25PM +0200, Andriy Gapon wrote: > >> on 05/11/2010 09:27 Andriy Gapon said the following: > >>> > >>> I use FreeSBD head and KDE 4 with all the bells and whistles enabled. > >>> Apparently recent KDE update has enabled even more of them, because I= started to > >>> have panics with a kernel that has INVARIANTS and WITNESS enabled. > >> > >> I tried to solve the problem by changing drmdev from mutex to sx: > >> http://people.freebsd.org/~avg/drm-sx.diff > > I remember that drm lock can be acquired from the interrupt thread, if > > the card supports interrupts. Changing it to sx cannot work then, becau= se > > interrupt threads cannot sleep. Most likely, you are getting around it > > since r600 not yet used interrupts on FreeBSD. > >=20 > > I think the solution is to drop drm lock around copyin. >=20 > Kostik, >=20 > thanks a lot for the help! > Are familiar enough with the code to tell if drmdev is always held at that > place? Or should I first check if it's actually owned and drop/reacquire= it > accordingly? I think you can assume that the lock is always owned. --iTK5zgLp6gXhzOi1 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEARECAAYFAkzX7IIACgkQC3+MBN1Mb4jB1wCgyV//8jHNz1bQucRshL/u/oh+ c0YAoLWMqVoUJYj4O4p/Xwxirsbwbd7O =MrAg -----END PGP SIGNATURE----- --iTK5zgLp6gXhzOi1--
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