linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-kernel@vger.kernel.org,
	Brijesh Singh <brijesh.singh@amd.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	"Kalra, Ashish" <ashish.kalra@amd.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org
Subject: Re: [PATCH v3 3/8] x86/psp: Register PSP platform device when ASP table is present
Date: Tue, 21 Mar 2023 15:15:40 +0100	[thread overview]
Message-ID: <8ab5804c-86b9-fe7a-3879-df231531a7a2@linux.microsoft.com> (raw)
In-Reply-To: <20230320210302.GEZBjKBj+5CLCm1+Tl@fat_crate.local>

On 20/03/2023 22:03, Borislav Petkov wrote:
> On Mon, Mar 20, 2023 at 09:18:19PM +0100, Jeremi Piotrowski wrote:
>> I agree with you here. The irq config of this thing requires specifying
>> passing a CPU vector, this follows the hardware spec which I linked in the
>> first 2 commits, pages 13-15 here:
> 
> You mean the interrupt vector in table 19?
> 

Yes - this thing wants to receive an interrupt vector and APIC id which it will
then use to target its interrupt at.

>> https://www.amd.com/system/files/TechDocs/58028_1.00-PUB.pdf
>>
>> The only way I found to get this to work was going through x86_vector_domain
>> or statically defining a system vector (the latter felt worse).
> 
> Hmm. Why is that thing special and can't use devm_request_irq() like the
> rest of the drivers out there?
> 

Because the device is not exposed through AML (with ACPI managed irq routing)
and needs to be discovered manually and the interrupt programmed by hand.
I don't know the reasoning behind it being specified this way.

But essentially I am doing all this nasty stuff so that I get a simple irq number.
This is then passed to the actual driver that binds to the platform_device
(drivers/crypto/ccp/sp-platform.c) which uses it with devm_request_irq.


  reply	other threads:[~2023-03-21 14:16 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-20 19:19 [PATCH v3 0/8] Support ACPI PSP on Hyper-V Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 1/8] include/acpi: add definition of ASPT table Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 2/8] ACPI: ASPT: Add helper to parse table Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 3/8] x86/psp: Register PSP platform device when ASP table is present Jeremi Piotrowski
2023-03-20 19:25   ` Borislav Petkov
2023-03-20 19:37     ` Jeremi Piotrowski
2023-03-20 20:03       ` Borislav Petkov
2023-03-20 20:18         ` Jeremi Piotrowski
2023-03-20 21:03           ` Borislav Petkov
2023-03-21 14:15             ` Jeremi Piotrowski [this message]
2023-03-20 19:19 ` [PATCH v3 4/8] x86/psp: Add IRQ support Jeremi Piotrowski
2023-03-21 10:31   ` Thomas Gleixner
2023-03-21 19:16     ` Jeremi Piotrowski
2023-03-22 10:07       ` Thomas Gleixner
2023-03-28 18:29         ` Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 5/8] crypto: cpp - Bind to psp platform device on x86 Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 6/8] crypto: ccp - Add vdata for platform device Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 7/8] crypto: ccp - Skip DMA coherency check for platform psp Jeremi Piotrowski
2023-03-20 19:19 ` [PATCH v3 8/8] crypto: ccp - Allow platform device to be psp master device Jeremi Piotrowski
2023-03-22 15:46 ` [PATCH v3 0/8] Support ACPI PSP on Hyper-V Borislav Petkov
2023-03-22 17:33   ` Jeremi Piotrowski
2023-03-22 18:15     ` Borislav Petkov
2023-03-23 14:46       ` Jeremi Piotrowski
2023-03-23 15:23         ` Borislav Petkov
2023-03-23 16:11           ` Jeremi Piotrowski
2023-03-23 16:34             ` Borislav Petkov
2023-03-24 17:10               ` Jeremi Piotrowski
2023-04-02 15:44                 ` Borislav Petkov
2023-04-03  6:20                   ` Thomas Gleixner
2023-04-05  7:56                     ` Jeremi Piotrowski
2023-04-11 15:10                       ` Jeremi Piotrowski
2023-04-13 21:53                       ` Thomas Gleixner
2023-04-05  8:10                     ` Jeremi Piotrowski
2023-04-05  8:50                   ` Jeremi Piotrowski

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=8ab5804c-86b9-fe7a-3879-df231531a7a2@linux.microsoft.com \
    --to=jpiotrowski@linux.microsoft.com \
    --cc=ashish.kalra@amd.com \
    --cc=bp@alien8.de \
    --cc=brijesh.singh@amd.com \
    --cc=dave.hansen@linux.intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=thomas.lendacky@amd.com \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).