Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756885Ab2JFUPe (ORCPT ); Sat, 6 Oct 2012 16:15:34 -0400 Received: from mail-qc0-f174.google.com ([209.85.216.174]:42316 "EHLO mail-qc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284Ab2JFUP2 (ORCPT ); Sat, 6 Oct 2012 16:15:28 -0400 From: Len Brown To: linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Lan Tianyu , Len Brown Subject: [PATCH 18/49] ACPI: Allow ACPI binding with USB-3.0 hub Date: Sat, 6 Oct 2012 16:09:39 -0400 Message-Id: <1033f9041d526dd694e2b2e12744e47c41040c4d.1349554106.git.len.brown@intel.com> X-Mailer: git-send-email 1.8.0.rc0.18.gf84667d In-Reply-To: <1349554210-29978-1-git-send-email-lenb@kernel.org> References: <1349554210-29978-1-git-send-email-lenb@kernel.org> In-Reply-To: References: Reply-To: Len Brown Organization: Intel Open Source Technology Center Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12280 Lines: 400 From: Lan Tianyu A USB port's position and connectability can't be identified on some boards via USB hub registers. ACPI _UPC and _PLD can help to resolve this issue and so it is necessary to bind USB with ACPI. This patch is to allow ACPI binding with USB-3.0 hub. Current ACPI only can bind one struct-device to one ACPI device node. This can not work with USB-3.0 hub, because the USB-3.0 hub has two logical devices. Each works for USB-2.0 and USB-3.0 devices. In the Linux USB subsystem, those two logical hubs are treated as two seperate devices that have two struct devices. But in the ACPI DSDT, these two logical hubs share one ACPI device node. So there is a requirement to bind multi struct-devices to one ACPI device node. This patch is to resolve such problem. Following is the ACPI device nodes' description under xhci hcd. Device (XHC) Device (RHUB) Device (HSP1) Device (HSP2) Device (HSP3) Device (HSP4) Device (SSP1) Device (SSP2) Device (SSP3) Device (SSP4) Topology in the Linux device XHC USB-2.0 logical hub USB-3.0 logical hub HSP1 SSP1 HSP2 SSP2 HSP3 SSP3 HSP4 SSP4 This patch also modifies the output of /proc/acpi/wakeup. One ACPI node can be associated with multiple devices: XHC S4 *enabled pci:0000:00:14.0 RHUB S0 disabled usb:usb1 disabled usb:usb2 Signed-off-by: Lan Tianyu Acked-by: Sarah Sharp Signed-off-by: Len Brown --- drivers/acpi/glue.c | 135 +++++++++++++++++++++++++++++---------------- drivers/acpi/proc.c | 57 ++++++++++++------- drivers/acpi/scan.c | 2 + drivers/pnp/pnpacpi/core.c | 7 +-- include/acpi/acpi_bus.h | 15 ++++- 5 files changed, 139 insertions(+), 77 deletions(-) diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index 243ee85..d1a2d74 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -25,6 +25,8 @@ static LIST_HEAD(bus_type_list); static DECLARE_RWSEM(bus_type_sem); +#define PHYSICAL_NODE_STRING "physical_node" + int register_acpi_bus_type(struct acpi_bus_type *type) { if (acpi_disabled) @@ -124,84 +126,119 @@ acpi_handle acpi_get_child(acpi_handle parent, u64 address) EXPORT_SYMBOL(acpi_get_child); -/* Link ACPI devices with physical devices */ -static void acpi_glue_data_handler(acpi_handle handle, - void *context) -{ - /* we provide an empty handler */ -} - -/* Note: a success call will increase reference count by one */ -struct device *acpi_get_physical_device(acpi_handle handle) -{ - acpi_status status; - struct device *dev; - - status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); - if (ACPI_SUCCESS(status)) - return get_device(dev); - return NULL; -} - -EXPORT_SYMBOL(acpi_get_physical_device); - static int acpi_bind_one(struct device *dev, acpi_handle handle) { struct acpi_device *acpi_dev; acpi_status status; + struct acpi_device_physical_node *physical_node; + char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; + int retval = -EINVAL; if (dev->archdata.acpi_handle) { dev_warn(dev, "Drivers changed 'acpi_handle'\n"); return -EINVAL; } + get_device(dev); - status = acpi_attach_data(handle, acpi_glue_data_handler, dev); - if (ACPI_FAILURE(status)) { - put_device(dev); - return -EINVAL; + status = acpi_bus_get_device(handle, &acpi_dev); + if (ACPI_FAILURE(status)) + goto err; + + physical_node = kzalloc(sizeof(struct acpi_device_physical_node), + GFP_KERNEL); + if (!physical_node) { + retval = -ENOMEM; + goto err; } - dev->archdata.acpi_handle = handle; - status = acpi_bus_get_device(handle, &acpi_dev); - if (!ACPI_FAILURE(status)) { - int ret; - - ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, - "firmware_node"); - ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, - "physical_node"); - if (acpi_dev->wakeup.flags.valid) - device_set_wakeup_capable(dev, true); + mutex_lock(&acpi_dev->physical_node_lock); + /* allocate physical node id according to physical_node_id_bitmap */ + physical_node->node_id = + find_first_zero_bit(acpi_dev->physical_node_id_bitmap, + ACPI_MAX_PHYSICAL_NODE); + if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) { + retval = -ENOSPC; + mutex_unlock(&acpi_dev->physical_node_lock); + goto err; } + set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap); + physical_node->dev = dev; + list_add_tail(&physical_node->node, &acpi_dev->physical_node_list); + acpi_dev->physical_node_count++; + mutex_unlock(&acpi_dev->physical_node_lock); + + dev->archdata.acpi_handle = handle; + + if (!physical_node->node_id) + strcpy(physical_node_name, PHYSICAL_NODE_STRING); + else + sprintf(physical_node_name, + "physical_node%d", physical_node->node_id); + retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, + physical_node_name); + retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, + "firmware_node"); + + if (acpi_dev->wakeup.flags.valid) + device_set_wakeup_capable(dev, true); + return 0; + + err: + put_device(dev); + return retval; } static int acpi_unbind_one(struct device *dev) { + struct acpi_device_physical_node *entry; + struct acpi_device *acpi_dev; + acpi_status status; + struct list_head *node, *next; + if (!dev->archdata.acpi_handle) return 0; - if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { - struct acpi_device *acpi_dev; - /* acpi_get_physical_device increase refcnt by one */ - put_device(dev); + status = acpi_bus_get_device(dev->archdata.acpi_handle, + &acpi_dev); + if (ACPI_FAILURE(status)) + goto err; - if (!acpi_bus_get_device(dev->archdata.acpi_handle, - &acpi_dev)) { - sysfs_remove_link(&dev->kobj, "firmware_node"); - sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node"); - } + mutex_lock(&acpi_dev->physical_node_lock); + list_for_each_safe(node, next, &acpi_dev->physical_node_list) { + char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; + + entry = list_entry(node, struct acpi_device_physical_node, + node); + if (entry->dev != dev) + continue; + + list_del(node); + clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap); - acpi_detach_data(dev->archdata.acpi_handle, - acpi_glue_data_handler); + acpi_dev->physical_node_count--; + + if (!entry->node_id) + strcpy(physical_node_name, PHYSICAL_NODE_STRING); + else + sprintf(physical_node_name, + "physical_node%d", entry->node_id); + + sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name); + sysfs_remove_link(&dev->kobj, "firmware_node"); dev->archdata.acpi_handle = NULL; /* acpi_bind_one increase refcnt by one */ put_device(dev); - } else { - dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); + kfree(entry); } + mutex_unlock(&acpi_dev->physical_node_lock); + return 0; + +err: + dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); + return -EINVAL; } static int acpi_platform_notify(struct device *dev) diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c index 251c7b62..27adb09 100644 --- a/drivers/acpi/proc.c +++ b/drivers/acpi/proc.c @@ -302,26 +302,41 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset) list_for_each_safe(node, next, &acpi_wakeup_device_list) { struct acpi_device *dev = container_of(node, struct acpi_device, wakeup_list); - struct device *ldev; + struct acpi_device_physical_node *entry; if (!dev->wakeup.flags.valid) continue; - ldev = acpi_get_physical_device(dev->handle); - seq_printf(seq, "%s\t S%d\t%c%-8s ", + seq_printf(seq, "%s\t S%d\t", dev->pnp.bus_id, - (u32) dev->wakeup.sleep_state, - dev->wakeup.flags.run_wake ? '*' : ' ', - (device_may_wakeup(&dev->dev) - || (ldev && device_may_wakeup(ldev))) ? - "enabled" : "disabled"); - if (ldev) - seq_printf(seq, "%s:%s", - ldev->bus ? ldev->bus->name : "no-bus", - dev_name(ldev)); - seq_printf(seq, "\n"); - put_device(ldev); - + (u32) dev->wakeup.sleep_state); + + if (!dev->physical_node_count) + seq_printf(seq, "%c%-8s\n", + dev->wakeup.flags.run_wake ? + '*' : ' ', "disabled"); + else { + struct device *ldev; + list_for_each_entry(entry, &dev->physical_node_list, + node) { + ldev = get_device(entry->dev); + if (!ldev) + continue; + + if (&entry->node != + dev->physical_node_list.next) + seq_printf(seq, "\t\t"); + + seq_printf(seq, "%c%-8s %s:%s\n", + dev->wakeup.flags.run_wake ? '*' : ' ', + (device_may_wakeup(&dev->dev) || + (ldev && device_may_wakeup(ldev))) ? + "enabled" : "disabled", + ldev->bus ? ldev->bus->name : + "no-bus", dev_name(ldev)); + put_device(ldev); + } + } } mutex_unlock(&acpi_device_lock); return 0; @@ -329,12 +344,14 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset) static void physical_device_enable_wakeup(struct acpi_device *adev) { - struct device *dev = acpi_get_physical_device(adev->handle); + struct acpi_device_physical_node *entry; - if (dev && device_can_wakeup(dev)) { - bool enable = !device_may_wakeup(dev); - device_set_wakeup_enable(dev, enable); - } + list_for_each_entry(entry, + &adev->physical_node_list, node) + if (entry->dev && device_can_wakeup(entry->dev)) { + bool enable = !device_may_wakeup(entry->dev); + device_set_wakeup_enable(entry->dev, enable); + } } static ssize_t diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index d1ecca2..d730a93 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -481,6 +481,8 @@ static int acpi_device_register(struct acpi_device *device) INIT_LIST_HEAD(&device->children); INIT_LIST_HEAD(&device->node); INIT_LIST_HEAD(&device->wakeup_list); + INIT_LIST_HEAD(&device->physical_node_list); + mutex_init(&device->physical_node_lock); new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); if (!new_bus_id) { diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c index 507a8e2..26b5d4b 100644 --- a/drivers/pnp/pnpacpi/core.c +++ b/drivers/pnp/pnpacpi/core.c @@ -321,14 +321,9 @@ static int __init acpi_pnp_match(struct device *dev, void *_pnp) { struct acpi_device *acpi = to_acpi_device(dev); struct pnp_dev *pnp = _pnp; - struct device *physical_device; - - physical_device = acpi_get_physical_device(acpi->handle); - if (physical_device) - put_device(physical_device); /* true means it matched */ - return !physical_device + return !acpi->physical_node_count && compare_pnp_id(pnp->id, acpi_device_hid(acpi)); } diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index bde976e..453596d 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -282,8 +282,16 @@ struct acpi_device_wakeup { int prepare_count; }; -/* Device */ +struct acpi_device_physical_node { + u8 node_id; + struct list_head node; + struct device *dev; +}; +/* set maximum of physical nodes to 32 for expansibility */ +#define ACPI_MAX_PHYSICAL_NODE 32 + +/* Device */ struct acpi_device { int device_type; acpi_handle handle; /* no handle for fixed hardware */ @@ -304,6 +312,10 @@ struct acpi_device { struct device dev; struct acpi_bus_ops bus_ops; /* workaround for different code path for hotplug */ enum acpi_bus_removal_type removal_type; /* indicate for different removal type */ + u8 physical_node_count; + struct list_head physical_node_list; + struct mutex physical_node_lock; + DECLARE_BITMAP(physical_node_id_bitmap, ACPI_MAX_PHYSICAL_NODE); }; static inline void *acpi_driver_data(struct acpi_device *d) @@ -394,7 +406,6 @@ struct acpi_bus_type { }; int register_acpi_bus_type(struct acpi_bus_type *); int unregister_acpi_bus_type(struct acpi_bus_type *); -struct device *acpi_get_physical_device(acpi_handle); struct acpi_pci_root { struct list_head node; -- 1.8.0.rc0.18.gf84667d -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/