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PCI: hv: Add vPCI version protocol negotiation

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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>
This commit is contained in:
Jork Loeser 2017-05-24 13:41:27 -07:00 committed by Bjorn Helgaas
parent 02c3764c77
commit b1db7e7e1d
1 changed files with 53 additions and 19 deletions
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72
drivers/pci/host/pci-hyperv.c
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@ -64,22 +64,37 @@
* 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
*/
@ -1849,6 +1864,7 @@ 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
@ -1865,26 +1881,44 @@ 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);