diff options
Diffstat (limited to 'drivers/staging/hv/vmbus_drv.c')
| -rw-r--r-- | drivers/staging/hv/vmbus_drv.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c index 2d3cf0f..9c2325d 100644 --- a/drivers/staging/hv/vmbus_drv.c +++ b/drivers/staging/hv/vmbus_drv.c @@ -33,6 +33,7 @@ #include "logging.h" #include "vmbus.h" #include "channel.h" +#include "vmbus_private.h" /* FIXME! We need to do this dynamically for PIC and APIC system */ @@ -122,6 +123,214 @@ static struct vmbus_driver_context g_vmbus_drv = { .bus.dev_attrs = vmbus_device_attrs, }; +static const char *gDriverName = "hyperv"; + +/* + * Windows vmbus does not defined this. + * We defined this to be consistent with other devices + */ +/* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */ +static const struct hv_guid gVmbusDeviceType = { + .data = { + 0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d, + 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85 + } +}; + +/* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */ +static const struct hv_guid gVmbusDeviceId = { + .data = { + 0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40, + 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5 + } +}; + +static struct hv_driver *gDriver; /* vmbus driver object */ +static struct hv_device *gDevice; /* vmbus root device */ + +/* + * VmbusChildDeviceAdd - Registers the child device with the vmbus + */ +int VmbusChildDeviceAdd(struct hv_device *ChildDevice) +{ + return vmbus_child_device_register(gDevice, ChildDevice); +} + +/* + * VmbusOnDeviceAdd - Callback when the root bus device is added + */ +static int VmbusOnDeviceAdd(struct hv_device *dev, void *AdditionalInfo) +{ + u32 *irqvector = AdditionalInfo; + int ret; + + gDevice = dev; + + memcpy(&gDevice->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid)); + memcpy(&gDevice->deviceInstance, &gVmbusDeviceId, + sizeof(struct hv_guid)); + + /* strcpy(dev->name, "vmbus"); */ + /* SynIC setup... */ + on_each_cpu(hv_synic_init, (void *)irqvector, 1); + + /* Connect to VMBus in the root partition */ + ret = VmbusConnect(); + + /* VmbusSendEvent(device->localPortId+1); */ + return ret; +} + +/* + * VmbusOnDeviceRemove - Callback when the root bus device is removed + */ +static int VmbusOnDeviceRemove(struct hv_device *dev) +{ + int ret = 0; + + vmbus_release_unattached_channels(); + VmbusDisconnect(); + on_each_cpu(hv_synic_cleanup, NULL, 1); + return ret; +} + +/* + * VmbusOnCleanup - Perform any cleanup when the driver is removed + */ +static void VmbusOnCleanup(struct hv_driver *drv) +{ + /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */ + + hv_cleanup(); +} + +/* + * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior + */ +void vmbus_on_msg_dpc(struct hv_driver *drv) +{ + int cpu = smp_processor_id(); + void *page_addr = hv_context.synic_message_page[cpu]; + struct hv_message *msg = (struct hv_message *)page_addr + + VMBUS_MESSAGE_SINT; + struct hv_message *copied; + + while (1) { + if (msg->header.message_type == HVMSG_NONE) { + /* no msg */ + break; + } else { + copied = kmemdup(msg, sizeof(*copied), GFP_ATOMIC); + if (copied == NULL) + continue; + + osd_schedule_callback(gVmbusConnection.WorkQueue, + vmbus_onmessage, + (void *)copied); + } + + msg->header.message_type = HVMSG_NONE; + + /* + * Make sure the write to MessageType (ie set to + * HVMSG_NONE) happens before we read the + * MessagePending and EOMing. Otherwise, the EOMing + * will not deliver any more messages since there is + * no empty slot + */ + mb(); + + if (msg->header.message_flags.msg_pending) { + /* + * This will cause message queue rescan to + * possibly deliver another msg from the + * hypervisor + */ + wrmsrl(HV_X64_MSR_EOM, 0); + } + } +} + +/* + * vmbus_on_event_dpc - DPC routine to handle events from the hypervisior + */ +void vmbus_on_event_dpc(struct hv_driver *drv) +{ + /* TODO: Process any events */ + VmbusOnEvents(); +} + +/* + * vmbus_on_isr - ISR routine + */ +int vmbus_on_isr(struct hv_driver *drv) +{ + int ret = 0; + int cpu = smp_processor_id(); + void *page_addr; + struct hv_message *msg; + union hv_synic_event_flags *event; + + page_addr = hv_context.synic_message_page[cpu]; + msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; + + /* Check if there are actual msgs to be process */ + if (msg->header.message_type != HVMSG_NONE) { + DPRINT_DBG(VMBUS, "received msg type %d size %d", + msg->header.message_type, + msg->header.payload_size); + ret |= 0x1; + } + + /* TODO: Check if there are events to be process */ + page_addr = hv_context.synic_event_page[cpu]; + event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; + + /* Since we are a child, we only need to check bit 0 */ + if (test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { + DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]); + ret |= 0x2; + } + + return ret; +} + +/* + * VmbusInitialize - Main entry point + */ +int VmbusInitialize(struct hv_driver *driver) +{ + int ret; + + DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++", + HV_DRV_VERSION); + DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++", + VMBUS_REVISION_NUMBER); + DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++", + VMBUS_MESSAGE_SINT); + DPRINT_DBG(VMBUS, "sizeof(vmbus_channel_packet_page_buffer)=%zd, " + "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd", + sizeof(struct vmbus_channel_packet_page_buffer), + sizeof(struct vmbus_channel_packet_multipage_buffer)); + + driver->name = gDriverName; + memcpy(&driver->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid)); + + /* Setup dispatch table */ + driver->OnDeviceAdd = VmbusOnDeviceAdd; + driver->OnDeviceRemove = VmbusOnDeviceRemove; + driver->OnCleanup = VmbusOnCleanup; + + /* Hypervisor initialization...setup hypercall page..etc */ + ret = hv_init(); + if (ret != 0) + DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x", + ret); + gDriver = driver; + + return ret; +} + static void get_channel_info(struct hv_device *device, struct hv_device_info *info) { |