From: Jike Song <jike.song@intel.com>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: "daniel.vetter@ffwll.ch" <daniel.vetter@ffwll.ch>,
"intel-gfx@lists.freedesktop.org"
<intel-gfx@lists.freedesktop.org>
Subject: Re: [RFC PATCH 7/8] drm/i915: vgt irq mediation - via a tasklet based mechanism
Date: Wed, 22 Oct 2014 15:34:59 +0800 [thread overview]
Message-ID: <54475E23.9070903@intel.com> (raw)
In-Reply-To: <AADFC41AFE54684AB9EE6CBC0274A5D12609AD99@SHSMSX101.ccr.corp.intel.com>
On 10/01/2014 12:26 AM, Tian, Kevin wrote:
> From virtualization p.o.v, the ideal case is to run host i915 irq handler in the
> interrupt context, which meets all the assumption from original code. Using
> tasklet or other manner still has some restriction. This is a major open we'd
> like to hear more from you guys. Is it possible to have i915 driver to request
> two irq numbers: irq1 for real device and irq2 is purely faked one. vgt handler
> registers on irq1 and i915 hanlder registers on irq2, and then we can use self
> IPI to trigger irq2 when injection is required. But I'm not sure whether this is
> an existing feature in kernel, or need some core enhancement in irq sub-system...
Hi Kevin, Daniel,
I'm so excited to know that, there is an existing feature in kernel: irq_work.
Basicly it allows us to run the host i915 ISR in hardirq context prefectly, what's
needed is to select CONFIG_IRQ_WORK in Kconfig :)
I'll use that in the v2 patches.
>
> Thanks
> Kevin
>
--
Thanks,
Jike
next prev parent reply other threads:[~2014-10-22 7:37 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-30 10:05 [RFC PATCH 0/8] Add host i915 support for vGPU Jike Song
2014-09-30 10:05 ` [RFC PATCH 1/8] drm/i915: introduce a new modparam: enable_vgt Jike Song
2014-09-30 10:05 ` [RFC PATCH 2/8] drm/i915: introduce the skeleton of vgt Jike Song
2014-09-30 10:05 ` [RFC PATCH 3/8] drm/i915: add the vgt implementation of MMIO/GTT mediations Jike Song
2014-09-30 16:34 ` Tian, Kevin
2014-10-01 10:58 ` Jike Song
2014-09-30 10:05 ` [RFC PATCH 4/8] drm/i915: redirect MMIO accesses to vgt if enabled Jike Song
2014-09-30 10:05 ` [RFC PATCH 5/8] drm/i915: GTT access abstraction Jike Song
2014-09-30 10:05 ` [RFC PATCH 6/8] drm/i915: redirect GTT accesses to vgt if enabled Jike Song
2014-09-30 10:05 ` [RFC PATCH 7/8] drm/i915: vgt irq mediation - via a tasklet based mechanism Jike Song
2014-09-30 10:30 ` Daniel Vetter
2014-09-30 16:26 ` Tian, Kevin
2014-10-22 7:34 ` Jike Song [this message]
2014-10-28 6:59 ` Tian, Kevin
2014-09-30 10:05 ` [RFC PATCH 8/8] drm/i915: enable vgt if specified by module param Jike Song
2014-10-22 9:48 ` [RFC PATCH 0/8] Add host i915 support for vGPU Daniel Vetter
2014-10-23 3:13 ` Jike Song
2014-10-23 8:56 ` Daniel Vetter
2014-10-23 11:01 ` Gerd Hoffmann
2014-10-23 12:10 ` Daniel Vetter
2014-10-23 12:32 ` Gerd Hoffmann
2014-10-28 8:45 ` Tian, Kevin
2014-10-28 8:25 ` Tian, Kevin
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