From: Ajay Kaher <akaher@vmware.com>
To: <kys@microsoft.com>, <haiyangz@microsoft.com>
Cc: <devel@linuxdriverproject.org>, <linux-pci@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, Ajay Kaher <akaher@vmware.com>,
Jork Loeser <jloeser@microsoft.com>,
Bjorn Helgaas <bhelgaas@google.com>
Subject: [PATCH 2/3] PCI: hv: Add vPCI version protocol negotiation
Date: Fri, 18 Jan 2019 02:17:17 +0530 [thread overview]
Message-ID: <1547758038-5255-3-git-send-email-akaher@vmware.com> (raw)
In-Reply-To: <1547758038-5255-1-git-send-email-akaher@vmware.com>
Hyper-V vPCI offers different protocol versions. Add the infra for
negotiating the one to use.
Signed-off-by: Jork Loeser <jloeser@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Ajay Kaher <akaher@vmware.com>
---
drivers/pci/host/pci-hyperv.c | 72 +++++++++++++++++++++++++++++++------------
1 file changed, 53 insertions(+), 19 deletions(-)
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
index 9e44adf..6eed85b 100644
--- a/drivers/pci/host/pci-hyperv.c
+++ b/drivers/pci/host/pci-hyperv.c
@@ -65,22 +65,37 @@
* major version.
*/
-#define PCI_MAKE_VERSION(major, minor) ((u32)(((major) << 16) | (major)))
+#define PCI_MAKE_VERSION(major, minor) ((u32)(((major) << 16) | (minor)))
#define PCI_MAJOR_VERSION(version) ((u32)(version) >> 16)
#define PCI_MINOR_VERSION(version) ((u32)(version) & 0xff)
-enum {
- PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1),
- PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1
+enum pci_protocol_version_t {
+ PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1), /* Win10 */
};
#define CPU_AFFINITY_ALL -1ULL
+
+/*
+ * Supported protocol versions in the order of probing - highest go
+ * first.
+ */
+static enum pci_protocol_version_t pci_protocol_versions[] = {
+ PCI_PROTOCOL_VERSION_1_1,
+};
+
+/*
+ * 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)
#define MAX_SUPPORTED_MSI_MESSAGES 0x400
+#define STATUS_REVISION_MISMATCH 0xC0000059
+
/*
* Message Types
*/
@@ -1789,6 +1804,7 @@ static int hv_pci_protocol_negotiation(struct hv_device *hdev)
struct hv_pci_compl comp_pkt;
struct pci_packet *pkt;
int ret;
+ int i;
/*
* Initiate the handshake with the host and negotiate
@@ -1805,26 +1821,44 @@ static int hv_pci_protocol_negotiation(struct hv_device *hdev)
pkt->compl_ctxt = &comp_pkt;
version_req = (struct pci_version_request *)&pkt->message;
version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION;
- version_req->protocol_version = PCI_PROTOCOL_VERSION_CURRENT;
- ret = vmbus_sendpacket(hdev->channel, version_req,
- sizeof(struct pci_version_request),
- (unsigned long)pkt, VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (ret)
- goto exit;
+ for (i = 0; i < ARRAY_SIZE(pci_protocol_versions); i++) {
+ version_req->protocol_version = pci_protocol_versions[i];
+ ret = vmbus_sendpacket(hdev->channel, version_req,
+ sizeof(struct pci_version_request),
+ (unsigned long)pkt, VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret) {
+ dev_err(&hdev->device,
+ "PCI Pass-through VSP failed sending version reqquest: %#x",
+ ret);
+ goto exit;
+ }
- wait_for_completion(&comp_pkt.host_event);
+ wait_for_completion(&comp_pkt.host_event);
- if (comp_pkt.completion_status < 0) {
- dev_err(&hdev->device,
- "PCI Pass-through VSP failed version request %x\n",
- comp_pkt.completion_status);
- ret = -EPROTO;
- goto exit;
+ if (comp_pkt.completion_status >= 0) {
+ pci_protocol_version = pci_protocol_versions[i];
+ dev_info(&hdev->device,
+ "PCI VMBus probing: Using version %#x\n",
+ pci_protocol_version);
+ goto exit;
+ }
+
+ if (comp_pkt.completion_status != STATUS_REVISION_MISMATCH) {
+ dev_err(&hdev->device,
+ "PCI Pass-through VSP failed version request: %#x",
+ comp_pkt.completion_status);
+ ret = -EPROTO;
+ goto exit;
+ }
+
+ reinit_completion(&comp_pkt.host_event);
}
- ret = 0;
+ dev_err(&hdev->device,
+ "PCI pass-through VSP failed to find supported version");
+ ret = -EPROTO;
exit:
kfree(pkt);
--
2.7.4
next prev parent reply other threads:[~2019-01-17 12:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-17 20:47 [PATCH 0/3] PCI: hv: Use vPCI protocol version 1.2 for v4.9 Ajay Kaher
2019-01-17 13:21 ` Greg KH
2019-01-17 20:47 ` [PATCH 1/3] PCI: hv: Allocate physically contiguous hypercall params buffer Ajay Kaher
2019-01-17 14:57 ` Bjorn Helgaas
2019-01-21 13:19 ` Dan Carpenter
2019-01-21 13:36 ` Dan Carpenter
2019-01-17 20:47 ` Ajay Kaher [this message]
2019-01-17 14:59 ` [PATCH 2/3] PCI: hv: Add vPCI version protocol negotiation Bjorn Helgaas
2019-01-17 20:47 ` [PATCH 3/3] PCI: hv: Use vPCI protocol version 1.2 for v4.9 Ajay Kaher
2019-01-17 15:06 ` Bjorn Helgaas
2019-01-18 14:05 ` Ajay Kaher
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