From: Jake Oshins <[mailto:jakeo@xxxxxxxxxxxxx]> This set of changes finds the _CRS object in the ACPI namespace that contains memory address space descriptors, intended to convey to VMBus which ranges of memory-mapped I/O space are available for child devices, and then builds a resource list that contains all those ranges. Without this change, only some of the memory-mapped I/O space will be available for child devices, and only in some virtual BIOS configurations (Generation 2 VMs). Signed-off-by: Jake Oshins <jakeo@xxxxxxxxxxxxx> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> --- drivers/hv/vmbus_drv.c | 97 +++++++++++++++++++++++++++++++++------ drivers/video/fbdev/hyperv_fb.c | 2 +- include/linux/hyperv.h | 2 +- 3 files changed, 85 insertions(+), 16 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index e334ccc..aebc8fe 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -45,10 +45,7 @@ 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) @@ -915,30 +912,98 @@ void vmbus_device_unregister(struct hv_device *device_obj) /* - * VMBUS is an acpi enumerated device. Get the the information we + * 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.address.minimum; + end = res->data.address32.address.maximum; break; case ACPI_RESOURCE_TYPE_ADDRESS64: - hyperv_mmio.start = res->data.address64.address.minimum; - hyperv_mmio.end = res->data.address64.address.maximum; + start = res->data.address64.address.minimum; + end = res->data.address64.address.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; } +static int vmbus_acpi_remove(struct acpi_device *device) +{ + struct resource *cur_res; + struct resource *next_res; + + if (hyperv_mmio) { + release_resource(hyperv_mmio); + for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { + next_res = cur_res->sibling; + kfree(cur_res); + } + } + + return 0; +} + static int vmbus_acpi_add(struct acpi_device *device) { acpi_status result; int ret_val = -ENODEV; + struct acpi_device *ancestor; hv_acpi_dev = device; @@ -948,23 +1013,26 @@ 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; acpi_walk_err: complete(&probe_event); + vmbus_acpi_remove(device); return ret_val; } @@ -980,6 +1048,7 @@ static struct acpi_driver vmbus_acpi_driver = { .ids = vmbus_acpi_device_ids, .ops = { .add = vmbus_acpi_add, + .remove = vmbus_acpi_remove, }, }; 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 26a32b7..e73cfeb 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1217,7 +1217,7 @@ 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. -- 1.7.4.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
