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;
From:   Frank Li <Frank.Li@nxp.com>
To:     tglx@linutronix.de
Cc:     aisheng.dong@nxp.com, bhelgaas@google.com,
        devicetree@vger.kernel.org, festevam@gmail.com, frank.li@nxp.com,
        imx@lists.linux.dev, jdmason@kudzu.us, kernel@pengutronix.de,
        kishon@ti.com, krzysztof.kozlowski+dt@linaro.org, kw@linux.com,
        linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com,
        linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
        lorenzo.pieralisi@arm.com, lpieralisi@kernel.org,
        manivannan.sadhasivam@linaro.org, maz@kernel.org,
        ntb@lists.linux.dev, peng.fan@nxp.com, robh+dt@kernel.org,
        s.hauer@pengutronix.de, shawnguo@kernel.org
Subject: [PATCH 0/3] Add RC-to-EP doorbell with platform MSI controller
Date:   Wed, 26 Apr 2023 16:34:33 -0400
Message-Id: <20230426203436.1277307-1-Frank.Li@nxp.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?d2orQkMxSUhaMDZLaDY4ZDJFZ0NsRlhWbm5DZzhKcHJTSEV1bW9ULzBhL3U1?=
 =?utf-8?B?K0paK1dINlpJcDBEN0dwR0x5aUtSeTJNWkRUUTIwZTRGd3JFQjU4cDV1V3ZQ?=
 =?utf-8?B?YlZXYWpSVVV1VUpqa1RpcmlRTEdXQUJIVTdMRXE3UHErcXpwRmNNaG5QbjNB?=
 =?utf-8?B?dU5CU1RYZmxNSmwybU1LVTNwNElocHJIYmd6MFIxUGxsMlNUTWdEcFF5L2V0?=
 =?utf-8?B?eERwTi9XbHFXRlUzTXQrNjUwQU9lMWhXMkFnY3BRNTNUYWY1UGxDcVp4UlB3?=
 =?utf-8?B?S2t1VWgwZ004aXJGNlA0LzhjQnRTa25uYWNwdW8rUFl3c0ZhUlYrSzY3a1gr?=
 =?utf-8?B?ZGdHc0lxcjhlcTNvY3dycWxCck1yT25nYjNsaEM2RXM3MjZsL2w1T3JGSDZG?=
 =?utf-8?B?T0gzTUxrcHRTWWZnUFJpNWpoQThmVWdOTEc0OTZyaElGVURLcFJETU1TL3lj?=
 =?utf-8?B?WmFTdTZHK2Y4OG1WYStlQjFCNnNFNWxVdkszOG93TjFmUzlmd2xhTnhjdXZU?=
 =?utf-8?B?dFYxc2hidk5uL0VtRDdxWnczUjg0eVhiNkNSVnBmVnV5ZHRkMFg4aFBjQTRK?=
 =?utf-8?B?M1ZYcnlqZ0FRUFh5OVdsV24yMW1vbW9XZWtiellCQWNMRWZpdld1eUIvbEt1?=
 =?utf-8?B?U3E2eWQwd1RTM1F2NFV1NkxlOEhoWEg1dkxld3F0U2ZTRVdVclAwMFpZWEJI?=
 =?utf-8?B?TTJURFYxVnpnOVFsVXVETjZULy9GVVlxUzg1U2k0UzBaMDdudndoWDJKdWZI?=
 =?utf-8?B?Y1ZyejdmVTU1bVhVTWFTNzhOcjhmNmI4T0dTRDVHdHR6TVU5K29PZUN2L2Ni?=
 =?utf-8?B?Q2Y3TzJObUw3MHhqY1dCMldZZU5UNDdlK1ZjV2JMMTFRRnFGR1YwYWJjOGlY?=
 =?utf-8?B?WWVJWVF4N1Fac1k3NmlRd3RsaFFZbHNoT2h1cGRoQXJxZiszNUZHckN1QmYz?=
 =?utf-8?B?NE1kMC92SkUzTWRuTUx5RDZmU2ZmRENGaWNrL1N5ZVJOUS9XTWJ4U1B4dnBl?=
 =?utf-8?B?dmJYblVoaFBwQkc5cHVVNlZaSVROSmRpZytIR3hZR2dza0NMWlM5UEk0ak1m?=
 =?utf-8?B?S2J0a2lwcVlOTnRWZ1lSaU5UajdBVzJJcjllM0RWVy9ISUhCRTM2T3B4alRJ?=
 =?utf-8?B?a2tUTEEyOS8vanQ0QVo3L1dWcUJwVGo1N1RmRmtwWVVTTXZoZXFqdlcwb3NE?=
 =?utf-8?B?MFlGQVF2cm5MUW01eG5EZEc0b1p5V0VNMmNLNVREYnNUOGdBZEErY1gwcDlI?=
 =?utf-8?B?RXlPdDBLaVBCN0JjbE1aQXZuTWdZbmlqdWh2TUd3SzVmdTVKQW9aYmlJYlI1?=
 =?utf-8?B?RUdlWjMzMmJxQ2pTbXJXeXh0aU1paUJjTXg4TVJpcVd3cEhKZHRVM3ZsaHhr?=
 =?utf-8?B?VS96VVlEY1BETHRQWUJOb1RwUG9YdDdscllBS3ZhQnpzdUlmSzZHUXFXSUo0?=
 =?utf-8?B?clRKNnZxTHNNUmtOTFBnYk9lNG5xT3k2MFNVNTVEbEVuYkVHVmZpcGVQNlVD?=
 =?utf-8?B?K0xtZ0xJTVdnQXJTRnVMcVpBa2x6S0JFRzFWSTc4dUk0VmpVb0JLcVl6bWJC?=
 =?utf-8?B?QW1aY3lUNHo3VDBySzlPSkFaRklRWldvLzZXcWtYVnQvQkd3QmZpZ3BLK1JH?=
 =?utf-8?B?ZGFaalBYQTFad3IvVHpKWkdIU0g4UTJDVVgxUUpkTnZwVTdCbXozYzU1c21y?=
 =?utf-8?B?dVUvQTdZQ0NyTGEyT2xxS3F5TkIxRVR3NkpoUzJKY0l5Y2tRaXVWemtaKzk4?=
 =?utf-8?B?alhOcHk5OFBkUERZWFpkbHNGcE1RY2Eyd25tSmRzVS9BRGlJOGQrYlFrMmVZ?=
 =?utf-8?B?bm0yUTU2a1lUbGNNcHUyOVhrcnhIcmIxVGV2N3ZpbG5mV1lsblpCR1lrNnhJ?=
 =?utf-8?B?OWQwZVBQRGpnbGlqelJLUTBSVm1XM1BVcDg5bGtaYitIMVZISmZDTEhLZnVJ?=
 =?utf-8?B?WDJYcWM1c1o4czZaTkxJWGJTNEhudXo0c0M2ZVE1ZGdNUUJhSFZPL2ZBU3ZG?=
 =?utf-8?B?R04vYWFKMHN6bmdlS2NCQ2dCeEx2S0xZTEs1TzdGMkN1aEZadFBlZlFsc1pD?=
 =?utf-8?B?MzlVcnNST2dkREtCWUhJczN4TVBJQ1NrUWVtaFRlRk1lbFFhOG5UVW9XTENu?=
 =?utf-8?Q?QcxVjsqCwxOg0VLbD5dz8J+Ca?=
X-OriginatorOrg: nxp.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 5c934bd1-919e-4bc0-4c0c-08db4695b29b
X-MS-Exchange-CrossTenant-AuthSource: AM6PR04MB4838.eurprd04.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Apr 2023 20:34:56.6011
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: vtWzb46rXu0SPBsQjyeW2LPZwFLZbqqe19cpqUdO9mSlqUwMyLXR2dJQeCTHGpu2I2h24aCaCVth4alsDFvglg==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6867
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,
        URIBL_BLOCKED autolearn=ham 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


┌────────────┐   ┌───────────────────────────────────┐   ┌────────────────┐
│            │   │                                   │   │                │
│            │   │ PCI Endpoint                      │   │ PCI Host       │
│            │   │                                   │   │                │
│            │◄──┤ 1.platform_msi_domain_alloc_irqs()│   │                │
│            │   │                                   │   │                │
│ MSI        ├──►│ 2.write_msi_msg()                 ├──►├─BAR<n>         │
│ Controller │   │   update doorbell register address│   │                │
│            │   │   for BAR                         │   │                │
│            │   │                                   │   │ 3. Write BAR<n>│
│            │◄──┼───────────────────────────────────┼───┤                │
│            │   │                                   │   │                │
│            ├──►│ 4.Irq Handle                      │   │                │
│            │   │                                   │   │                │
│            │   │                                   │   │                │
└────────────┘   └───────────────────────────────────┘   └────────────────┘

This patches based on old https://lore.kernel.org/imx/20221124055036.1630573-1-Frank.Li@nxp.com/

Original patch only target to vntb driver. But actually it is common
method. 

This patches add new API to pci-epf-core, so any EP driver can use it. 

The key point is comments from Thomas Gleixner, who suggest use new
PCI/IMS. But arm platform change still not be merged yet.

git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git devmsi-v2-arm

So I still use existed method implement RC to EP doorbell.

If Thomas Gleixner want to continue work on devmsi-v2-arm, I can help test
and update this patch.

Frank Li (3):
  PCI: endpoint: Add RC-to-EP doorbell support using platform MSI
    controller
  misc: pci_endpoint_test: Add doorbell test case
  tools: PCI: Add 'B' option for test doorbell

 drivers/misc/pci_endpoint_test.c    |  41 +++++++++++
 drivers/pci/endpoint/pci-epf-core.c | 109 ++++++++++++++++++++++++++++
 include/linux/pci-epf.h             |  16 ++++
 include/uapi/linux/pcitest.h        |   1 +
 tools/pci/pcitest.c                 |  16 +++-
 5 files changed, 182 insertions(+), 1 deletion(-)

-- 
2.34.1