From: Maarten Lankhorst <maarten.lankhorst@canonical.com>
To: Jerome Glisse <j.glisse@gmail.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>,
Alex Deucher <alexander.deucher@amd.com>,
Peter Zijlstra <peterz@infradead.org>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
intel-gfx <intel-gfx@lists.freedesktop.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [RFC PATCH] drm/radeon: fixup locking inversion between mmap_sem and reservations
Date: Tue, 08 Oct 2013 16:45:41 +0200 [thread overview]
Message-ID: <52541A95.4040107@canonical.com> (raw)
In-Reply-To: <20131008143354.GA2355@gmail.com>
op 08-10-13 16:33, Jerome Glisse schreef:
> On Tue, Oct 08, 2013 at 04:14:40PM +0200, Maarten Lankhorst wrote:
>> Allocate and copy all kernel memory before doing reservations. This prevents a locking
>> inversion between mmap_sem and reservation_class, and allows us to drop the trylocking
>> in ttm_bo_vm_fault without upsetting lockdep.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
> I would say NAK. Current code only allocate temporary page in AGP case.
> So AGP case is userspace -> temp page -> cs checker -> radeon ib.
>
> Non AGP is directly memcpy to radeon IB.
>
> Your patch allocate memory memcpy userspace to it and it will then be
> memcpy to IB. Which means you introduce an extra memcpy in the process
> not something we want.
>
Can we move up the call to radeon_ib_get then to be done before calling radeon_cs_parser_relocs?
~Maarten
next prev parent reply other threads:[~2013-10-08 14:45 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-12 15:06 [BUG] completely bonkers use of set_need_resched + VM_FAULT_NOPAGE Peter Zijlstra
2013-09-12 15:11 ` Maarten Lankhorst
2013-09-12 15:14 ` Peter Zijlstra
2013-09-12 15:36 ` Daniel Vetter
2013-09-12 15:43 ` Peter Zijlstra
2013-09-12 15:58 ` Daniel Vetter
2013-09-12 16:22 ` Peter Zijlstra
2013-09-12 16:35 ` Chris Wilson
2013-09-12 20:30 ` Peter Zijlstra
2013-09-12 20:37 ` Thomas Gleixner
2013-09-12 19:52 ` Daniel Vetter
2013-09-12 19:58 ` Thomas Gleixner
2013-09-12 20:04 ` Daniel Vetter
2013-09-12 20:20 ` Thomas Gleixner
2013-09-12 20:23 ` Daniel Vetter
2013-09-12 20:39 ` Thomas Gleixner
2013-09-12 20:48 ` Thomas Hellstrom
2013-09-12 16:33 ` Thomas Hellstrom
2013-09-12 15:45 ` Maarten Lankhorst
2013-09-12 16:44 ` Thomas Hellstrom
2013-09-12 19:48 ` Daniel Vetter
2013-09-12 21:50 ` Maarten Lankhorst
2013-09-13 5:33 ` Thomas Hellstrom
2013-09-13 8:26 ` Daniel Vetter
2013-10-08 14:14 ` [RFC PATCH] drm/radeon: fixup locking inversion between mmap_sem and reservations Maarten Lankhorst
2013-10-08 14:33 ` Jerome Glisse
2013-10-08 14:45 ` Christian König
2013-10-08 14:55 ` Jerome Glisse
2013-10-08 16:29 ` Thomas Hellstrom
2013-10-08 16:47 ` Jerome Glisse
2013-10-08 16:58 ` Thomas Hellstrom
2013-10-09 12:36 ` [RFC PATCH v2] drm/radeon: fixup locking inversion between, " Maarten Lankhorst
2013-10-09 10:58 ` [RFC PATCH] drm/radeon: fixup locking inversion between " Maarten Lankhorst
2013-10-08 14:45 ` Maarten Lankhorst [this message]
2013-10-08 14:57 ` Jerome Glisse
2013-09-13 6:44 ` [BUG] completely bonkers use of set_need_resched + VM_FAULT_NOPAGE Thomas Hellstrom
2013-09-13 7:16 ` Maarten Lankhorst
2013-09-13 7:46 ` Thomas Hellstrom
2013-09-13 7:51 ` Maarten Lankhorst
2013-09-13 8:23 ` Thomas Hellstrom
2013-09-13 8:32 ` Daniel Vetter
2013-09-13 8:39 ` Thomas Hellstrom
2013-09-13 8:58 ` Maarten Lankhorst
2013-09-13 9:21 ` Thomas Hellstrom
2013-09-13 8:29 ` Peter Zijlstra
2013-09-13 8:41 ` Daniel Vetter
2013-09-13 9:00 ` Peter Zijlstra
2013-09-23 15:33 ` [RFC PATCH] drm/nouveau: fix nested locking in mmap handler Maarten Lankhorst
2013-09-24 7:22 ` Thomas Hellstrom
2013-09-24 7:34 ` Maarten Lankhorst
2013-09-24 8:20 ` Ingo Molnar
2013-09-24 9:03 ` Thomas Hellstrom
2013-09-24 9:36 ` Daniel Vetter
2013-09-24 10:11 ` Maarten Lankhorst
2013-09-24 10:33 ` Thomas Hellstrom
2013-09-24 11:32 ` Maarten Lankhorst
2013-09-24 17:04 ` Thomas Hellstrom
2013-09-24 9:43 ` Maarten Lankhorst
2013-09-24 17:53 ` Thomas Hellstrom
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