From: Rajesh Shah <rajesh.shah@intel.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: pci express switch driver
Date: Fri, 05 Nov 2004 21:57:34 +0000 [thread overview]
Message-ID: <20041105135733.A17788@unix-os.sc.intel.com> (raw)
In-Reply-To: <73943A6B3BEAA1468EE1A4A090129F436DABCD@corpbridge.corp.idt.com>
On Thu, Nov 04, 2004 at 03:40:54PM -0800, Sadik, Pallathu wrote:
>
> Let us say, I have put the second switch and the endpoints
> associated with it to low power mode (D3hot). Then I press
> the Attention button on a downstream port of the second
> switch. This should generate PM_PME event. This event
> should be handled by the ACPI, right? Hence the
> question.
>
I _think_ I understand your question better now - you are trying
to see if acpi based hotplug will work if you force an acpi
interrupt by putting the switch and devices in the low power
state before you hotplug, correct?
In the case you mentioned, just because an ACPI SCI is asserted
does not mean you will be able to use acpiphp based hotplug.
For ACPI based hotplug to work, your firmware has to create a
namespace object for the p2p bridge that you are trying to
hotadd so that acpiphp can install a notify handler on it. When
you hotplug the switch and cause the SCI, the corresponding Lxx
or Exx method for the GPE must issue an ACPI Notify on the
switch object. Then acpiphp would get a chance to run and add
the switch.
As I said before, acpiphp, shpc and pcie drivers do not
currently have all the code to deal with switch hotplug so even
if you hack up the ACPI namespace to do this, the current
hotplug code will not be able to deal with it anyway.
Rajesh
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prev parent reply other threads:[~2004-11-05 21:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-10 2:15 pci express switch driver Sadik, Pallathu
2004-10-30 4:37 ` Greg KH
2004-11-02 1:58 ` Rajesh Shah
2004-11-03 0:42 ` Sy, Dely L
2004-11-04 1:52 ` Sadik, Pallathu
2004-11-04 22:22 ` Rajesh Shah
2004-11-04 23:40 ` Sadik, Pallathu
2004-11-05 21:57 ` Rajesh Shah [this message]
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