From: "Michel Dänzer" <michel@daenzer.net>
To: christian.koenig@amd.com, Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v3 05/12] drm/ttm: Expose ttm_tt_unpopulate for driver use
Date: Wed, 25 Nov 2020 17:56:41 +0100 [thread overview]
Message-ID: <6669f4ca-bfca-e54e-6d24-ee1bff0c17db@daenzer.net> (raw)
In-Reply-To: <71683ae7-f443-c15a-7003-6ba4ad3d4b15@gmail.com>
On 2020-11-25 1:57 p.m., Christian König wrote:
>
> Well thinking more about this, it seems to be a another really good
> argument why mapping pages from DMA-bufs into application address space
> directly is a very bad idea :)
Apologies for going off on a tangent here...
Since allowing userspace mmap with dma-buf fds seems to be a trap in
general[0], I wonder if there's any way we could stop supporting that?
[0] E.g. mutter had to disable handing out dma-bufs for screen capture
by default with non-i915 for now, because in particular with discrete
GPUs, direct CPU reads can be unusably slow (think single-digit frames
per second), and of course there's other userspace which goes "ooh,
dma-buf, let's map and read!".
--
Earthling Michel Dänzer | https://redhat.com
Libre software enthusiast | Mesa and X developer
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next prev parent reply other threads:[~2020-11-25 16:56 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-21 5:21 [PATCH v3 00/12] RFC Support hot device unplug in amdgpu Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 01/12] drm: Add dummy page per device or GEM object Andrey Grodzovsky
2020-11-21 14:15 ` Christian König
2020-11-23 4:54 ` Andrey Grodzovsky
2020-11-23 8:01 ` Christian König
2021-01-05 21:04 ` Andrey Grodzovsky
2021-01-07 16:21 ` Daniel Vetter
2021-01-07 16:26 ` Andrey Grodzovsky
2021-01-07 16:28 ` Andrey Grodzovsky
2021-01-07 16:30 ` Daniel Vetter
2021-01-07 16:37 ` Andrey Grodzovsky
2021-01-08 14:26 ` Andrey Grodzovsky
2021-01-08 14:33 ` Christian König
2021-01-08 14:46 ` Andrey Grodzovsky
2021-01-08 14:52 ` Christian König
2021-01-08 16:49 ` Grodzovsky, Andrey
2021-01-11 16:13 ` Daniel Vetter
2021-01-11 16:15 ` Daniel Vetter
2021-01-11 17:41 ` Andrey Grodzovsky
2021-01-11 20:45 ` Andrey Grodzovsky
2021-01-12 9:10 ` Daniel Vetter
2021-01-12 12:32 ` Christian König
2021-01-12 15:59 ` Andrey Grodzovsky
2021-01-13 9:14 ` Christian König
2021-01-13 14:40 ` Andrey Grodzovsky
2021-01-12 15:54 ` Andrey Grodzovsky
2021-01-12 8:12 ` Christian König
2021-01-12 9:13 ` Daniel Vetter
2020-11-21 5:21 ` [PATCH v3 02/12] drm: Unamp the entire device address space on device unplug Andrey Grodzovsky
2020-11-21 14:16 ` Christian König
2020-11-24 14:44 ` Daniel Vetter
2020-11-21 5:21 ` [PATCH v3 03/12] drm/ttm: Remap all page faults to per process dummy page Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 04/12] drm/ttm: Set dma addr to null after freee Andrey Grodzovsky
2020-11-21 14:13 ` Christian König
2020-11-23 5:15 ` Andrey Grodzovsky
2020-11-23 8:04 ` Christian König
2020-11-21 5:21 ` [PATCH v3 05/12] drm/ttm: Expose ttm_tt_unpopulate for driver use Andrey Grodzovsky
2020-11-25 10:42 ` Christian König
2020-11-23 20:05 ` Andrey Grodzovsky
2020-11-23 20:20 ` Christian König
2020-11-23 20:38 ` Andrey Grodzovsky
2020-11-23 20:41 ` Christian König
2020-11-23 21:08 ` Andrey Grodzovsky
2020-11-24 7:41 ` Christian König
2020-11-24 16:22 ` Andrey Grodzovsky
2020-11-24 16:44 ` Christian König
2020-11-25 10:40 ` Daniel Vetter
2020-11-25 12:57 ` Christian König
2020-11-25 16:36 ` Daniel Vetter
2020-11-25 19:34 ` Andrey Grodzovsky
2020-11-27 13:10 ` Grodzovsky, Andrey
2020-11-27 14:59 ` Daniel Vetter
2020-11-27 16:04 ` Andrey Grodzovsky
2020-11-30 14:15 ` Daniel Vetter
2020-11-25 16:56 ` Michel Dänzer [this message]
2020-11-25 17:02 ` Daniel Vetter
2020-12-15 20:18 ` Andrey Grodzovsky
2020-12-16 8:04 ` Christian König
2020-12-16 14:21 ` Daniel Vetter
2020-12-16 16:13 ` Andrey Grodzovsky
2020-12-16 16:18 ` Christian König
2020-12-16 17:12 ` Daniel Vetter
2020-12-16 17:20 ` Daniel Vetter
2020-12-16 18:26 ` Andrey Grodzovsky
2020-12-16 23:15 ` Daniel Vetter
2020-12-17 0:20 ` Andrey Grodzovsky
2020-12-17 12:01 ` Daniel Vetter
2020-12-17 19:19 ` Andrey Grodzovsky
2020-12-17 20:10 ` Christian König
2020-12-17 20:38 ` Andrey Grodzovsky
2020-12-17 20:48 ` Daniel Vetter
2020-12-17 21:06 ` Andrey Grodzovsky
2020-12-18 14:30 ` Daniel Vetter
2020-12-17 20:42 ` Daniel Vetter
2020-12-17 21:13 ` Andrey Grodzovsky
2021-01-04 16:33 ` Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 06/12] drm/sched: Cancel and flush all oustatdning jobs before finish Andrey Grodzovsky
2020-11-22 11:56 ` Christian König
2020-11-21 5:21 ` [PATCH v3 07/12] drm/sched: Prevent any job recoveries after device is unplugged Andrey Grodzovsky
2020-11-22 11:57 ` Christian König
2020-11-23 5:37 ` Andrey Grodzovsky
2020-11-23 8:06 ` Christian König
2020-11-24 1:12 ` Luben Tuikov
2020-11-24 7:50 ` Christian König
2020-11-24 17:11 ` Luben Tuikov
2020-11-24 17:17 ` Andrey Grodzovsky
2020-11-24 17:41 ` Luben Tuikov
2020-11-24 17:40 ` Christian König
2020-11-24 17:44 ` Luben Tuikov
2020-11-21 5:21 ` [PATCH v3 08/12] drm/amdgpu: Split amdgpu_device_fini into early and late Andrey Grodzovsky
2020-11-24 14:53 ` Daniel Vetter
2020-11-24 15:51 ` Andrey Grodzovsky
2020-11-25 10:41 ` Daniel Vetter
2020-11-25 17:41 ` Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 09/12] drm/amdgpu: Add early fini callback Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 10/12] drm/amdgpu: Avoid sysfs dirs removal post device unplug Andrey Grodzovsky
2020-11-24 14:49 ` Daniel Vetter
2020-11-24 22:27 ` Andrey Grodzovsky
2020-11-25 9:04 ` Daniel Vetter
2020-11-25 17:39 ` Andrey Grodzovsky
2020-11-27 13:12 ` Grodzovsky, Andrey
2020-11-27 15:04 ` Daniel Vetter
2020-11-27 15:34 ` Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 11/12] drm/amdgpu: Register IOMMU topology notifier per device Andrey Grodzovsky
2020-11-21 5:21 ` [PATCH v3 12/12] drm/amdgpu: Fix a bunch of sdma code crash post device unplug Andrey Grodzovsky
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