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Wed, 11 Sep 2019 23:35:16 +0000 From: Dexuan Cui To: KY Srinivasan , Haiyang Zhang , Stephen Hemminger , "sashal@kernel.org" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "linux-hyperv@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Michael Kelley CC: Dexuan Cui Subject: [PATCH] scsi: storvsc: Add the support of hibernation Thread-Topic: [PATCH] scsi: storvsc: Add the support of hibernation Thread-Index: AQHVaPmQQ30E4hrjgUuSDngi9Du3cA== Date: Wed, 11 Sep 2019 23:35:16 +0000 Message-ID: <1568244905-66625-1-git-send-email-decui@microsoft.com> Reply-To: Dexuan Cui Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR1201CA0005.namprd12.prod.outlook.com (2603:10b6:301:4a::15) To SN6PR2101MB0942.namprd21.prod.outlook.com (2603:10b6:805:4::19) authentication-results: spf=none (sender IP is ) smtp.mailfrom=decui@microsoft.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 1.8.3.1 x-originating-ip: [13.77.154.182] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 59cbefb5-c9dd-4a4b-91d4-08d73710b31c x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020);SRVR:SN6PR2101MB0909; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: s9rujWZM/0rorl9a2CyfBGdzOF+58q0urFMvYQp5Ruf9pA1vY2+KmFgmwx0n230OvF8SJyyfigeZK5PK+BvqR7dPZ6kYjWZLbj8Fq8+7Hezb509N0KAgFFGcXKNq1yCCX4K8E22cP1ghAPDrg4IdsCp9fZJdTcDxNIPEsWu9gTMbHa6A9XTXc59SKdTBP96EpMkJ/JwYjvrqgZ82TWRFO4DRbdUP+b+04pR5f2DQ33xeG5zNGad/lGNfAiaTqyc7swFGa6WdkgGp1EOBKEHGpu0uxvYoLXXK/jvoddUjEBmyalP5nxQoekWzTJ0miaqgKb3Iz21WKwGNP1zlR6VjT/O3XUdD9eraE1jpJ7mGRyW6s5bCcLannS2nbFiWrucWdpMyMfv9fUImDzpMetFLb2lraclLWSZzNi6TKfDc0DA= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 59cbefb5-c9dd-4a4b-91d4-08d73710b31c X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2019 23:35:16.2681 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 64LNPdQUhPL7oR6hbsEs/pI8cH/+CiI9sycVPdtUDTFBC400RvYvy9PHUHDWU0U25kN1zOiPQL3H/kbIpSV5ag== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB0909 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org When we're in storvsc_suspend(), we're sure the SCSI layer has quiesced the scsi device by scsi_bus_suspend() -> ... -> scsi_device_quiesce(), so the low level SCSI adapter driver only needs to suspend/resume its own state. Signed-off-by: Dexuan Cui --- This patch is basically a pure Hyper-V specific change and it has a build dependency on the commit 271b2224d42f ("Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation"), which is on Sasha Levin's Hyper-V tree's hyperv-next branch: https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/log/?h=3Dh= yperv-next I request this patch should go through Sasha's tree rather than the SCSI tree. drivers/scsi/storvsc_drv.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index ed8b9ac..9fbf604 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1727,6 +1727,13 @@ enum { =20 MODULE_DEVICE_TABLE(vmbus, id_table); =20 +static const struct { guid_t guid; } fc_guid =3D { HV_SYNTHFC_GUID }; + +static bool hv_dev_is_fc(struct hv_device *hv_dev) +{ + return guid_equal(&fc_guid.guid, &hv_dev->dev_type); +} + static int storvsc_probe(struct hv_device *device, const struct hv_vmbus_device_id *dev_id) { @@ -1935,11 +1942,45 @@ static int storvsc_remove(struct hv_device *dev) return 0; } =20 +static int storvsc_suspend(struct hv_device *hv_dev) +{ + struct storvsc_device *stor_device =3D hv_get_drvdata(hv_dev); + struct Scsi_Host *host =3D stor_device->host; + struct hv_host_device *host_dev =3D shost_priv(host); + + storvsc_wait_to_drain(stor_device); + + drain_workqueue(host_dev->handle_error_wq); + + vmbus_close(hv_dev->channel); + + memset(stor_device->stor_chns, 0, + num_possible_cpus() * sizeof(void *)); + + kfree(stor_device->stor_chns); + stor_device->stor_chns =3D NULL; + + cpumask_clear(&stor_device->alloced_cpus); + + return 0; +} + +static int storvsc_resume(struct hv_device *hv_dev) +{ + int ret; + + ret =3D storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, + hv_dev_is_fc(hv_dev)); + return ret; +} + static struct hv_driver storvsc_drv =3D { .name =3D KBUILD_MODNAME, .id_table =3D id_table, .probe =3D storvsc_probe, .remove =3D storvsc_remove, + .suspend =3D storvsc_suspend, + .resume =3D storvsc_resume, .driver =3D { .probe_type =3D PROBE_PREFER_ASYNCHRONOUS, }, --=20 1.8.3.1