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Wed, 11 Sep 2019 23:38:23 +0000 From: Dexuan Cui To: KY Srinivasan , Haiyang Zhang , Stephen Hemminger , "sashal@kernel.org" , "lorenzo.pieralisi@arm.com" , "bhelgaas@google.com" , "linux-hyperv@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Michael Kelley CC: Dexuan Cui Subject: [PATCH 4/4] PCI: hv: Change pci_protocol_version to per-hbus Thread-Topic: [PATCH 4/4] PCI: hv: Change pci_protocol_version to per-hbus Thread-Index: AQHVaPoAFdEKC5iwakqGSO4n9CfPoQ== Date: Wed, 11 Sep 2019 23:38:23 +0000 Message-ID: <1568245086-70601-5-git-send-email-decui@microsoft.com> References: <1568245086-70601-1-git-send-email-decui@microsoft.com> In-Reply-To: <1568245086-70601-1-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: MWHPR19CA0072.namprd19.prod.outlook.com (2603:10b6:300:94::34) To SN6PR2101MB0942.namprd21.prod.outlook.com (2603:10b6:805:4::19) authentication-results: spf=none (sender IP is ) smtp.mailfrom=decui@microsoft.com; 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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: 1fxsbW9tHbAaMqi9QoRcz9jN++hBndQxKAC379aU9Jsv3wDqqnBmy/436IRhpJYgMQE9Z5PpwyL7CX+VkoO6RltNvsw6I6MjjiOI7XzNNz/KyLasfDjr6Eb54z40qej/QuKTI9oHxCQqVebma0VpqY/4yZyVHpB58LKYjDhSzKAr9LnRg1RPqVsvtg/OBSM12tltO9xVYcRq+TPnVLEtwtOTd7GrAeLtIn2LFrbYtw0JW8rUIQt12hbbPdJNK5uKXq7JDpyop5QmkW4bIuy7y+boGSxeC4vF8A6g8EIM4QsIbBwte6XXCe15pQKlbOc5ugIpb8BqWuZkq93fhdkt0pVsAn3GkhjrwnNA7D+TOo2gz2f6KqMcsArxxgAzPmWLlUbrC3MKNHplK8Q+mMOUcx+hr9w76/qJmfdyzW7BYqM= 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: 641a4b42-a458-4149-49b3-08d73711229b X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2019 23:38:23.3376 (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: GbAnGWRftTKDca6wOOC0joVMLEU9fHHAs/gRbhEH8SpFt1fOsOQyJ/40lu7JvaYLIfWboujut2BtsXnX6/nz3Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1087 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A VM can have multiple hbus. It looks incorrect for the second hbus's hv_pci_protocol_negotiation() to set the global variable 'pci_protocol_version' (which was set by the first hbus), even if the same value is written. Signed-off-by: Dexuan Cui --- drivers/pci/controller/pci-hyperv.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/p= ci-hyperv.c index 2655df2..55730c5 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -76,11 +76,6 @@ enum pci_protocol_version_t { PCI_PROTOCOL_VERSION_1_1, }; =20 -/* - * Protocol version negotiated by hv_pci_protocol_negotiation(). - */ -static enum pci_protocol_version_t pci_protocol_version; - #define PCI_CONFIG_MMIO_LENGTH 0x2000 #define CFG_PAGE_OFFSET 0x1000 #define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET) @@ -429,6 +424,8 @@ enum hv_pcibus_state { =20 struct hv_pcibus_device { struct pci_sysdata sysdata; + /* Protocol version negotiated with the host */ + enum pci_protocol_version_t protocol_version; enum hv_pcibus_state state; refcount_t remove_lock; struct hv_device *hdev; @@ -942,7 +939,7 @@ static void hv_irq_unmask(struct irq_data *data) * negative effect (yet?). */ =20 - if (pci_protocol_version >=3D PCI_PROTOCOL_VERSION_1_2) { + if (hbus->protocol_version >=3D PCI_PROTOCOL_VERSION_1_2) { /* * PCI_PROTOCOL_VERSION_1_2 supports the VP_SET version of the * HVCALL_RETARGET_INTERRUPT hypercall, which also coincides @@ -1112,7 +1109,7 @@ static void hv_compose_msi_msg(struct irq_data *data,= struct msi_msg *msg) ctxt.pci_pkt.completion_func =3D hv_pci_compose_compl; ctxt.pci_pkt.compl_ctxt =3D ∁ =20 - switch (pci_protocol_version) { + switch (hbus->protocol_version) { case PCI_PROTOCOL_VERSION_1_1: size =3D hv_compose_msi_req_v1(&ctxt.int_pkts.v1, dest, @@ -2116,6 +2113,7 @@ static int hv_pci_protocol_negotiation(struct hv_devi= ce *hdev, enum pci_protocol_version_t version[], int num_version) { + struct hv_pcibus_device *hbus =3D hv_get_drvdata(hdev); struct pci_version_request *version_req; struct hv_pci_compl comp_pkt; struct pci_packet *pkt; @@ -2155,10 +2153,10 @@ static int hv_pci_protocol_negotiation(struct hv_de= vice *hdev, } =20 if (comp_pkt.completion_status >=3D 0) { - pci_protocol_version =3D version[i]; + hbus->protocol_version =3D version[i]; dev_info(&hdev->device, "PCI VMBus probing: Using version %#x\n", - pci_protocol_version); + hbus->protocol_version); goto exit; } =20 @@ -2442,7 +2440,7 @@ static int hv_send_resources_allocated(struct hv_devi= ce *hdev) u32 wslot; int ret; =20 - size_res =3D (pci_protocol_version < PCI_PROTOCOL_VERSION_1_2) + size_res =3D (hbus->protocol_version < PCI_PROTOCOL_VERSION_1_2) ? sizeof(*res_assigned) : sizeof(*res_assigned2); =20 pkt =3D kmalloc(sizeof(*pkt) + size_res, GFP_KERNEL); @@ -2461,7 +2459,7 @@ static int hv_send_resources_allocated(struct hv_devi= ce *hdev) pkt->completion_func =3D hv_pci_generic_compl; pkt->compl_ctxt =3D &comp_pkt; =20 - if (pci_protocol_version < PCI_PROTOCOL_VERSION_1_2) { + if (hbus->protocol_version < PCI_PROTOCOL_VERSION_1_2) { res_assigned =3D (struct pci_resources_assigned *)&pkt->message; res_assigned->message_type.type =3D @@ -2812,7 +2810,7 @@ static int hv_pci_resume(struct hv_device *hdev) return ret; =20 /* Only use the version that was in use before hibernation. */ - version[0] =3D pci_protocol_version; + version[0] =3D hbus->protocol_version; ret =3D hv_pci_protocol_negotiation(hdev, version, 1); if (ret) goto out; --=20 1.8.3.1