Signed-off-by: Jake Oshins <jakeo@xxxxxxxxxxxxx>
---
drivers/hv/vmbus_drv.c | 85 +++++++++++++++++++++++++++++++++--------
drivers/video/fbdev/hyperv_fb.c | 2 +-
include/linux/hyperv.h | 2 +-
3 files changed, 72 insertions(+), 17 deletions(-)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 4d6b269..ba5b7a1 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -43,10 +43,7 @@ static struct tasklet_struct msg_dpc;
static struct completion probe_event;
static int irq;
-struct resource hyperv_mmio = {
- .name = "hyperv mmio",
- .flags = IORESOURCE_MEM,
-};
+struct resource *hyperv_mmio;
EXPORT_SYMBOL_GPL(hyperv_mmio);
static int vmbus_exists(void)
@@ -849,23 +846,74 @@ void vmbus_device_unregister(struct hv_device *device_obj)
/*
- * VMBUS is an acpi enumerated device. Get the the information we
- * need from DSDT.
+ * VMBUS is an acpi enumerated device. Get the
+ * information we need from DSDT.
*/
static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
{
+ resource_size_t start = 0;
+ resource_size_t end = 0;
+ struct resource *new_res;
+ struct resource **old_res = &hyperv_mmio;
+
switch (res->type) {
case ACPI_RESOURCE_TYPE_IRQ:
irq = res->data.irq.interrupts[0];
+ return AE_OK;
+
+ /*
+ * "Address" descriptors are for bus windows. Ignore
+ * "memory" descriptors, which are for registers on
+ * devices.
+ */
+ case ACPI_RESOURCE_TYPE_ADDRESS32:
+ start = res->data.address32.minimum;
+ end = res->data.address32.maximum;
break;
case ACPI_RESOURCE_TYPE_ADDRESS64:
- hyperv_mmio.start = res->data.address64.minimum;
- hyperv_mmio.end = res->data.address64.maximum;
+ start = res->data.address64.minimum;
+ end = res->data.address64.maximum;
break;
+
+ default:
+ /* Unused resource type */
+ return AE_OK;
}
+ /*
+ * Ignore ranges that are below 1MB, as they're not
+ * necessary or useful here.
+ */
+ if (end < 0x100000)
+ return AE_OK;
+
+ new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC);
+ if (!new_res)
+ return AE_NO_MEMORY;
+
+ new_res->name = "hyperv mmio";
+ new_res->flags = IORESOURCE_MEM;
+ new_res->start = start;
+ new_res->end = end;
+
+ do {
+ if (!*old_res) {
+ *old_res = new_res;
+ break;
+ }
+
+ if ((*old_res)->start > new_res->end) {
+ new_res->sibling = *old_res;
+ *old_res = new_res;
+ break;
+ }
+
+ old_res = &(*old_res)->sibling;
+
+ } while (1);
+
return AE_OK;
}
@@ -873,6 +921,7 @@ static int vmbus_acpi_add(struct acpi_device *device)
{
acpi_status result;
int ret_val = -ENODEV;
+ struct acpi_device *ancestor;
hv_acpi_dev = device;
@@ -882,18 +931,22 @@ static int vmbus_acpi_add(struct acpi_device *device)
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.
+ * Some ancestor of the vmbus acpi device (Gen1 or Gen2
+ * firmware) is the VMOD that has the mmio ranges. Get that.
*/
- if (device->parent) {
- result = acpi_walk_resources(device->parent->handle,
+ for (ancestor = device->parent;
+ ancestor;
+ ancestor = ancestor->parent) {
+ result = acpi_walk_resources(ancestor->handle,
METHOD_NAME__CRS,
vmbus_walk_resources, NULL);
if (ACPI_FAILURE(result))
- goto acpi_walk_err;
- if (hyperv_mmio.start && hyperv_mmio.end)
- request_resource(&iomem_resource, &hyperv_mmio);
+ continue;
+ if (hyperv_mmio) {
+ request_resource(&iomem_resource, hyperv_mmio);
+ break;
+ }
}
ret_val = 0;
@@ -962,6 +1015,8 @@ static void __exit vmbus_exit(void)
hv_remove_vmbus_irq();
vmbus_free_channels();
bus_unregister(&hv_bus);
+ if (hyperv_mmio)
+ release_resource(hyperv_mmio);
hv_cleanup();
acpi_bus_unregister_driver(&vmbus_acpi_driver);
}
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index 4254336..003c8f0 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -686,7 +686,7 @@ static int hvfb_getmem(struct fb_info *info)
par->mem.name = KBUILD_MODNAME;
par->mem.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
if (gen2vm) {
- ret = allocate_resource(&hyperv_mmio, &par->mem,
+ ret = allocate_resource(hyperv_mmio, &par->mem,
screen_fb_size,
0, -1,
screen_fb_size,
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 476c685..8903689 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1178,7 +1178,7 @@ int hv_vss_init(struct hv_util_service *);
void hv_vss_deinit(void);
void hv_vss_onchannelcallback(void *);
-extern struct resource hyperv_mmio;
+extern struct resource *hyperv_mmio;
/*
* Negotiated version with the Host.
--
1.9.1
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