Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Wed, 16 Nov 2022 15:40:53 -0400
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Marc Zyngier <maz@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Dave Jiang <dave.jiang@intel.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Kevin Tian <kevin.tian@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Ashok Raj <ashok.raj@intel.com>, Jon Mason <jdmason@kudzu.us>,
        Allen Hubbe <allenbh@gmail.com>,
        "Ahmed S. Darwish" <darwi@linutronix.de>,
        Reinette Chatre <reinette.chatre@intel.com>
Subject: Re: [patch 24/33] PCI/MSI: Provide prepare_desc() MSI domain op
Message-ID: <Y3U8xT+tF1IR7OF8@nvidia.com>
References: <20221111133158.196269823@linutronix.de>
 <20221111135206.632756918@linutronix.de>
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20221111135206.632756918@linutronix.de>
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?UQ8YRYGJAGiEEnETUC3QXSR1XGrugGRK9BSor9qbooFhDYz3C6F/xoAUTlYZ?=
 =?us-ascii?Q?l5WJk/R8DIVMcahMd+hvkTC7c21EHkdG6gAFpEMYMWygJg/NOx4+7S+10WhV?=
 =?us-ascii?Q?EzHj2FLdP2rCFTwhVt9UyZXyTfqUDvkK/K3AmllJ6XLXf7IlG1Mx6/BfwlTf?=
 =?us-ascii?Q?F7a0laYgUJ0X5xWkdw6YVCav2afuWsKvWeJGp0MBrpheo9ZxXp/6pXsXiKvF?=
 =?us-ascii?Q?q92JQojOoESthSh7xpdJzDCXQPEC6y7i1yVV2zbZN1MqtYEOO3cgwUku23qk?=
 =?us-ascii?Q?/F+076xxILwcXnz+0srDyDKpF+xLBNTIO8qTQqaORnM2r1vcrZGPBYDQs7mF?=
 =?us-ascii?Q?RTPTvx7fWVxQ1oaFeQuWtWiFH90RdV7fkKjLeL6ha009uxNX+voM0KI08AvW?=
 =?us-ascii?Q?kbAxED9XyQnUJ02h8rLAWI5pwjeX2DdVVUQtznYlx3njxaG8N4dpYtnB+ZVa?=
 =?us-ascii?Q?/eLQZ3eWf8EFc0gVxT7slmlrG29r//2rHit9y7NLcJ4CdCbeO43FJcT/Mq4R?=
 =?us-ascii?Q?6GF3nKCKpf6vorX+oR0GVU3a0Xs1G2sbnLMu1f0Pdh4l/H+iwV39QuG/KP3w?=
 =?us-ascii?Q?/8WVdit2hqN1i7erfa8AKjQNpF4KWdO27loh3dWCllikNWwI+zEGAB9eQOLC?=
 =?us-ascii?Q?QBAgRMBkQEPefuR4H/j74kxLZjHvFroXnlqESgvOSNCPUTUzPKkhrLE9BL3F?=
 =?us-ascii?Q?3hepZcwuHGyeQFQHbxWDEsNzf4wZwMc/LPUNTbIPYk8WL/1QWI6A0boQ8UvX?=
 =?us-ascii?Q?sbRuMcCicNZ0E7UIGOd2frMMW38wy0gfp5YtlKgl5rtdlu4LJ/ZVL+aKXNpI?=
 =?us-ascii?Q?fPPY5iF2J6UJnlbhRkTpvhsRN+pQhbt3sdUD6ZMiUteYybda3vjA0CC+KYZj?=
 =?us-ascii?Q?RPh9okxnl9/2rZgwugqRzcZupZxoifehcv66QcUFHRJmd5dlNWM1qhV+bZ16?=
 =?us-ascii?Q?gtFL/spBqEDZrQjuuP0BSRTKP8DyxI1sOhkoux10yJUos8lvNZMlgAjccFzF?=
 =?us-ascii?Q?Zo1TEuOO9hmpCIWwM7KS3Y7eoCbhzHe3qyRxahDFlGy5jEEnw8B9JpCoTAsn?=
 =?us-ascii?Q?YpvYWgBsCxkzj5axIgAj88/bOa3hhAV/dP+fDPGLuhJHWGL+5KHYHZHG+7af?=
 =?us-ascii?Q?IX+XxNbmSjUs1+eiGBXcgoPY+fVsnWEWugMYN9OYJ9EmDkYhOL9e9Im46QjM?=
 =?us-ascii?Q?rwoIszo4U/4Nw/TTiiaTXdfAGPzk4+djGlAgFgiJ0vGvUaq1gnVnbFoyQWny?=
 =?us-ascii?Q?ODC8RMrUYypq5mIdRJAHNe28zaQTawX9trMsWDg6DetjUVU3iJmulC06D73z?=
 =?us-ascii?Q?e9fZGeqY+D72oCCQTI7grRvIdFbnNNyJorkYECnm+rufN8booa/+4x8fx3GB?=
 =?us-ascii?Q?Dj4BGhyiAVaUooNjABwVj9vawokddaqK+whujJVhmnCeFpTcfpCMvw0EVm1I?=
 =?us-ascii?Q?HRyjK462sJRKVO4C0kGN1hYvKIiLRCpdQk5AZPhTAk3k+OGF+fCm8Hop301w?=
 =?us-ascii?Q?tE1qtcS8SZAGMOu76C/bo1qhnNdtJnvTWd8wbDhTj6vc8dYEPoEZOG/G94Z8?=
 =?us-ascii?Q?SCZhGcpYnkcIovY1bQpHsedfqKEZd0KwMrH5OiiP?=
X-OriginatorOrg: Nvidia.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 1ea7a309-9ddc-4419-e663-08dac80a799b
X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Nov 2022 19:40:54.3397
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: 82H2wGUMfvT6Uocr1DcStbFVyclCOK2s64+qij8T2jFS95cMj6aqKK9iVfzyVG2I
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR12MB5236
X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
        DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,
        RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE
        autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Nov 11, 2022 at 02:58:49PM +0100, Thomas Gleixner wrote:
> Dynamic MSI-X vector allocation post MSI-X allows to allocate vectors at a
> given index or at any free index in the available table range. The latter
> requires that the core code selects the index at descriptor allocation time.
> 
> This requires that the PCI/MSI-X specific setup of the MSI-X descriptor,
> which is partially depending on the chosen index happens after allocation.
> 
> Implement the prepare_desc() op in the PCI/MSI-X specific msi_domain_ops
> which is invoked before the core interrupt descriptor and the associated
> Linux interrupt number is allocated. That callback is also provided for the
> upcoming PCI/IMS implementations so the implementation specific interrupt
> domain can do their domain specific initialization of the MSI descriptors.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
>  drivers/pci/msi/irqdomain.c |    9 +++++++++
>  1 file changed, 9 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason