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Commit b1db7e7e authored by Jork Loeser's avatar Jork Loeser Committed by Bjorn Helgaas
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PCI: hv: Add vPCI version protocol negotiation



Hyper-V vPCI offers different protocol versions.  Add the infra for
negotiating the one to use.

Signed-off-by: default avatarJork Loeser <jloeser@microsoft.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Acked-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
parent 02c3764c
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+53 −19
Original line number Original line Diff line number Diff line
@@ -64,22 +64,37 @@
 * major version.
 * 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_MAJOR_VERSION(version) ((u32)(version) >> 16)
#define PCI_MINOR_VERSION(version) ((u32)(version) & 0xff)
#define PCI_MINOR_VERSION(version) ((u32)(version) & 0xff)


enum {
enum pci_protocol_version_t {
	PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1),
	PCI_PROTOCOL_VERSION_1_1 = PCI_MAKE_VERSION(1, 1),	/* Win10 */
	PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1
};
};


#define CPU_AFFINITY_ALL	-1ULL
#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 PCI_CONFIG_MMIO_LENGTH	0x2000
#define CFG_PAGE_OFFSET 0x1000
#define CFG_PAGE_OFFSET 0x1000
#define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET)
#define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET)


#define MAX_SUPPORTED_MSI_MESSAGES 0x400
#define MAX_SUPPORTED_MSI_MESSAGES 0x400


#define STATUS_REVISION_MISMATCH 0xC0000059

/*
/*
 * Message Types
 * Message Types
 */
 */
@@ -1849,6 +1864,7 @@ static int hv_pci_protocol_negotiation(struct hv_device *hdev)
	struct hv_pci_compl comp_pkt;
	struct hv_pci_compl comp_pkt;
	struct pci_packet *pkt;
	struct pci_packet *pkt;
	int ret;
	int ret;
	int i;


	/*
	/*
	 * Initiate the handshake with the host and negotiate
	 * Initiate the handshake with the host and negotiate
@@ -1865,26 +1881,44 @@ static int hv_pci_protocol_negotiation(struct hv_device *hdev)
	pkt->compl_ctxt = &comp_pkt;
	pkt->compl_ctxt = &comp_pkt;
	version_req = (struct pci_version_request *)&pkt->message;
	version_req = (struct pci_version_request *)&pkt->message;
	version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION;
	version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION;
	version_req->protocol_version = PCI_PROTOCOL_VERSION_CURRENT;


	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,
		ret = vmbus_sendpacket(hdev->channel, version_req,
				sizeof(struct pci_version_request),
				sizeof(struct pci_version_request),
				(unsigned long)pkt, VM_PKT_DATA_INBAND,
				(unsigned long)pkt, VM_PKT_DATA_INBAND,
				VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
				VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
	if (ret)
		if (ret) {
			dev_err(&hdev->device,
				"PCI Pass-through VSP failed sending version reqquest: %#x",
				ret);
			goto exit;
			goto exit;
		}


		wait_for_completion(&comp_pkt.host_event);
		wait_for_completion(&comp_pkt.host_event);


	if (comp_pkt.completion_status < 0) {
		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,
			dev_err(&hdev->device,
			"PCI Pass-through VSP failed version request %x\n",
				"PCI Pass-through VSP failed version request: %#x",
				comp_pkt.completion_status);
				comp_pkt.completion_status);
			ret = -EPROTO;
			ret = -EPROTO;
			goto exit;
			goto exit;
		}
		}


	ret = 0;
		reinit_completion(&comp_pkt.host_event);
	}

	dev_err(&hdev->device,
		"PCI pass-through VSP failed to find supported version");
	ret = -EPROTO;


exit:
exit:
	kfree(pkt);
	kfree(pkt);