diff options
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 45 |
1 files changed, 32 insertions, 13 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 077bb1bdac34..b37c91b6ba80 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -43,6 +43,10 @@ static struct acpi_device *hv_acpi_dev; static struct tasklet_struct msg_dpc; static struct completion probe_event; static int irq; +u64 hyperv_mmio_start; +EXPORT_SYMBOL_GPL(hyperv_mmio_start); +u64 hyperv_mmio_size; +EXPORT_SYMBOL_GPL(hyperv_mmio_size); static int vmbus_exists(void) { @@ -886,18 +890,19 @@ void vmbus_device_unregister(struct hv_device *device_obj) /* - * VMBUS is an acpi enumerated device. Get the the IRQ information - * from DSDT. + * VMBUS is an acpi enumerated device. Get the the information we + * need from DSDT. */ -static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) +static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) { + switch (res->type) { + case ACPI_RESOURCE_TYPE_IRQ: + irq = res->data.irq.interrupts[0]; - if (res->type == ACPI_RESOURCE_TYPE_IRQ) { - struct acpi_resource_irq *irqp; - irqp = &res->data.irq; - - *((unsigned int *)irq) = irqp->interrupts[0]; + case ACPI_RESOURCE_TYPE_ADDRESS64: + hyperv_mmio_start = res->data.address64.minimum; + hyperv_mmio_size = res->data.address64.address_length; } return AE_OK; @@ -906,18 +911,32 @@ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) static int vmbus_acpi_add(struct acpi_device *device) { acpi_status result; + int ret_val = -ENODEV; hv_acpi_dev = device; result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, - vmbus_walk_resources, &irq); + vmbus_walk_resources, NULL); - if (ACPI_FAILURE(result)) { - complete(&probe_event); - return -ENODEV; + if (ACPI_FAILURE(result)) + goto acpi_walk_err; + /* + * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that + * has the mmio ranges. Get that. + */ + if (device->parent) { + result = acpi_walk_resources(device->parent->handle, + METHOD_NAME__CRS, + vmbus_walk_resources, NULL); + + if (ACPI_FAILURE(result)) + goto acpi_walk_err; } + ret_val = 0; + +acpi_walk_err: complete(&probe_event); - return 0; + return ret_val; } static const struct acpi_device_id vmbus_acpi_device_ids[] = { |