lkml.org 
[lkml]   [2016]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFT v2] iommu/amd: use subsys_initcall() on amdv2 iommu
On Tue, Apr 19, 2016 at 10:02:52AM +0800, Wan Zongshun wrote:
>
> You have to take carefully to arrange the calling sequence for
> iommuv1, iommuv2, kfd module, and drm like the following sequence :
> v1 ->v2->kfd, drm.
>
> iommuv1 -- rootfs_initcall(fn)
> IOMMUV2 -- device_initcall(fn)
> kfd module -- late_initcall(fn)
> drm -- late_initcall(fn)

Thanks, it turns out this is not exactly enough, given as
Joerg notes:

--
AMD-KFD on the other hand needs to be loaded before the
radeon driver (but this it not enforced by symbols), because otherwise
the radeon driver will not initialize the AMD-KFD driver.
---

We have a theoretical race still possible between the kfd module
and the drm driver. I'll reply to Joerg's e-mail with more feedback.

Luis

\
 
 \ /
  Last update: 2016-05-27 02:21    [W:0.117 / U:1.540 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site