diff options
59 files changed, 1287 insertions, 239 deletions
diff --git a/Documentation/DocBook/uio-howto.tmpl b/Documentation/DocBook/uio-howto.tmpl index 8f6e3b2403c..4d4ce0e61e4 100644 --- a/Documentation/DocBook/uio-howto.tmpl +++ b/Documentation/DocBook/uio-howto.tmpl @@ -25,6 +25,10 @@ <year>2006-2008</year> <holder>Hans-Jürgen Koch.</holder> </copyright> +<copyright> + <year>2009</year> + <holder>Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)</holder> +</copyright> <legalnotice> <para> @@ -42,6 +46,13 @@ GPL version 2. <revhistory> <revision> + <revnumber>0.9</revnumber> + <date>2009-07-16</date> + <authorinitials>mst</authorinitials> + <revremark>Added generic pci driver + </revremark> + </revision> + <revision> <revnumber>0.8</revnumber> <date>2008-12-24</date> <authorinitials>hjk</authorinitials> @@ -809,6 +820,158 @@ framework to set up sysfs files for this region. Simply leave it alone. </chapter> +<chapter id="uio_pci_generic" xreflabel="Using Generic driver for PCI cards"> +<?dbhtml filename="uio_pci_generic.html"?> +<title>Generic PCI UIO driver</title> + <para> + The generic driver is a kernel module named uio_pci_generic. + It can work with any device compliant to PCI 2.3 (circa 2002) and + any compliant PCI Express device. Using this, you only need to + write the userspace driver, removing the need to write + a hardware-specific kernel module. + </para> + +<sect1 id="uio_pci_generic_binding"> +<title>Making the driver recognize the device</title> + <para> +Since the driver does not declare any device ids, it will not get loaded +automatically and will not automatically bind to any devices, you must load it +and allocate id to the driver yourself. For example: + <programlisting> + modprobe uio_pci_generic + echo "8086 10f5" > /sys/bus/pci/drivers/uio_pci_generic/new_id + </programlisting> + </para> + <para> +If there already is a hardware specific kernel driver for your device, the +generic driver still won't bind to it, in this case if you want to use the +generic driver (why would you?) you'll have to manually unbind the hardware +specific driver and bind the generic driver, like this: + <programlisting> + echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind + echo -n 0000:00:19.0 > /sys/bus/pci/drivers/uio_pci_generic/bind + </programlisting> + </para> + <para> +You can verify that the device has been bound to the driver +by looking for it in sysfs, for example like the following: + <programlisting> + ls -l /sys/bus/pci/devices/0000:00:19.0/driver + </programlisting> +Which if successful should print + <programlisting> + .../0000:00:19.0/driver -> ../../../bus/pci/drivers/uio_pci_generic + </programlisting> +Note that the generic driver will not bind to old PCI 2.2 devices. +If binding the device failed, run the following command: + <programlisting> + dmesg + </programlisting> +and look in the output for failure reasons + </para> +</sect1> + +<sect1 id="uio_pci_generic_internals"> +<title>Things to know about uio_pci_generic</title> + <para> +Interrupts are handled using the Interrupt Disable bit in the PCI command +register and Interrupt Status bit in the PCI status register. All devices +compliant to PCI 2.3 (circa 2002) and all compliant PCI Express devices should +support these bits. uio_pci_generic detects this support, and won't bind to +devices which do not support the Interrupt Disable Bit in the command register. + </para> + <para> +On each interrupt, uio_pci_generic sets the Interrupt Disable bit. +This prevents the device from generating further interrupts +until the bit is cleared. The userspace driver should clear this +bit before blocking and waiting for more interrupts. + </para> +</sect1> +<sect1 id="uio_pci_generic_userspace"> +<title>Writing userspace driver using uio_pci_generic</title> + <para> +Userspace driver can use pci sysfs interface, or the +libpci libray that wraps it, to talk to the device and to +re-enable interrupts by writing to the command register. + </para> +</sect1> +<sect1 id="uio_pci_generic_example"> +<title>Example code using uio_pci_generic</title> + <para> +Here is some sample userspace driver code using uio_pci_generic: +<programlisting> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> + +int main() +{ + int uiofd; + int configfd; + int err; + int i; + unsigned icount; + unsigned char command_high; + + uiofd = open("/dev/uio0", O_RDONLY); + if (uiofd < 0) { + perror("uio open:"); + return errno; + } + configfd = open("/sys/class/uio/uio0/device/config", O_RDWR); + if (uiofd < 0) { + perror("config open:"); + return errno; + } + + /* Read and cache command value */ + err = pread(configfd, &command_high, 1, 5); + if (err != 1) { + perror("command config read:"); + return errno; + } + command_high &= ~0x4; + + for(i = 0;; ++i) { + /* Print out a message, for debugging. */ + if (i == 0) + fprintf(stderr, "Started uio test driver.\n"); + else + fprintf(stderr, "Interrupts: %d\n", icount); + + /****************************************/ + /* Here we got an interrupt from the + device. Do something to it. */ + /****************************************/ + + /* Re-enable interrupts. */ + err = pwrite(configfd, &command_high, 1, 5); + if (err != 1) { + perror("config write:"); + break; + } + + /* Wait for next interrupt. */ + err = read(uiofd, &icount, 4); + if (err != 4) { + perror("uio read:"); + break; + } + + } + return errno; +} + +</programlisting> + </para> +</sect1> + +</chapter> + <appendix id="app1"> <title>Further information</title> <itemizedlist> diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt index 2bcc8d4dea2..90e8b3383ba 100644 --- a/Documentation/trace/events.txt +++ b/Documentation/trace/events.txt @@ -22,12 +22,12 @@ tracing information should be printed. --------------------------------- The events which are available for tracing can be found in the file -/debug/tracing/available_events. +/sys/kernel/debug/tracing/available_events. To enable a particular event, such as 'sched_wakeup', simply echo it -to /debug/tracing/set_event. For example: +to /sys/kernel/debug/tracing/set_event. For example: - # echo sched_wakeup >> /debug/tracing/set_event + # echo sched_wakeup >> /sys/kernel/debug/tracing/set_event [ Note: '>>' is necessary, otherwise it will firstly disable all the events. ] @@ -35,15 +35,15 @@ to /debug/tracing/set_event. For example: To disable an event, echo the event name to the set_event file prefixed with an exclamation point: - # echo '!sched_wakeup' >> /debug/tracing/set_event + # echo '!sched_wakeup' >> /sys/kernel/debug/tracing/set_event To disable all events, echo an empty line to the set_event file: - # echo > /debug/tracing/set_event + # echo > /sys/kernel/debug/tracing/set_event To enable all events, echo '*:*' or '*:' to the set_event file: - # echo *:* > /debug/tracing/set_event + # echo *:* > /sys/kernel/debug/tracing/set_event The events are organized into subsystems, such as ext4, irq, sched, etc., and a full event name looks like this: <subsystem>:<event>. The @@ -52,29 +52,29 @@ file. All of the events in a subsystem can be specified via the syntax "<subsystem>:*"; for example, to enable all irq events, you can use the command: - # echo 'irq:*' > /debug/tracing/set_event + # echo 'irq:*' > /sys/kernel/debug/tracing/set_event 2.2 Via the 'enable' toggle --------------------------- -The events available are also listed in /debug/tracing/events/ hierarchy +The events available are also listed in /sys/kernel/debug/tracing/events/ hierarchy of directories. To enable event 'sched_wakeup': - # echo 1 > /debug/tracing/events/sched/sched_wakeup/enable + # echo 1 > /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable To disable it: - # echo 0 > /debug/tracing/events/sched/sched_wakeup/enable + # echo 0 > /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable To enable all events in sched subsystem: - # echo 1 > /debug/tracing/events/sched/enable + # echo 1 > /sys/kernel/debug/tracing/events/sched/enable To eanble all events: - # echo 1 > /debug/tracing/events/enable + # echo 1 > /sys/kernel/debug/tracing/events/enable When reading one of these enable files, there are four results: diff --git a/MAINTAINERS b/MAINTAINERS index 64b9e447545..9117b65f4ae 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2218,6 +2218,13 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git S: Maintained F: include/asm-generic +GENERIC UIO DRIVER FOR PCI DEVICES +M: Michael S. Tsirkin <mst@redhat.com> +L: kvm@vger.kernel.org +L: linux-kernel@vger.kernel.org +S: Supported +F: drivers/uio/uio_pci_generic.c + GFS2 FILE SYSTEM M: Steven Whitehouse <swhiteho@redhat.com> L: cluster-devel@redhat.com diff --git a/block/genhd.c b/block/genhd.c index 5b76bf55d05..2ad91ddad8e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -903,7 +903,7 @@ static struct attribute_group disk_attr_group = { .attrs = disk_attrs, }; -static struct attribute_group *disk_attr_groups[] = { +static const struct attribute_group *disk_attr_groups[] = { &disk_attr_group, NULL }; diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 8f006f96ff5..ee377270beb 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -8,6 +8,31 @@ config UEVENT_HELPER_PATH Path to uevent helper program forked by the kernel for every uevent. +config DEVTMPFS + bool "Create a kernel maintained /dev tmpfs (EXPERIMENTAL)" + depends on HOTPLUG && SHMEM && TMPFS + help + This creates a tmpfs filesystem, and mounts it at bootup + and mounts it at /dev. The kernel driver core creates device + nodes for all registered devices in that filesystem. All device + nodes are owned by root and have the default mode of 0600. + Userspace can add and delete the nodes as needed. This is + intended to simplify bootup, and make it possible to delay + the initial coldplug at bootup done by udev in userspace. + It should also provide a simpler way for rescue systems + to bring up a kernel with dynamic major/minor numbers. + Meaningful symlinks, permissions and device ownership must + still be handled by userspace. + If unsure, say N here. + +config DEVTMPFS_MOUNT + bool "Automount devtmpfs at /dev" + depends on DEVTMPFS + help + This will mount devtmpfs at /dev if the kernel mounts the root + filesystem. It will not affect initramfs based mounting. + If unsure, say N here. + config STANDALONE bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL default y diff --git a/drivers/base/Makefile b/drivers/base/Makefile index b5b8ba512b2..c12c7f2f2a6 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -4,8 +4,10 @@ obj-y := core.o sys.o bus.o dd.o \ driver.o class.o platform.o \ cpu.o firmware.o init.o map.o devres.o \ attribute_container.o transport_class.o +obj-$(CONFIG_DEVTMPFS) += devtmpfs.o obj-y += power/ obj-$(CONFIG_HAS_DMA) += dma-mapping.o +obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o obj-$(CONFIG_ISA) += isa.o obj-$(CONFIG_FW_LOADER) += firmware_class.o obj-$(CONFIG_NUMA) += node.o diff --git a/drivers/base/base.h b/drivers/base/base.h index b528145a078..2ca7f5b7b82 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -70,6 +70,8 @@ struct class_private { * @knode_parent - node in sibling list * @knode_driver - node in driver list * @knode_bus - node in bus list + * @driver_data - private pointer for driver specific info. Will turn into a + * list soon. * @device - pointer back to the struct class that this structure is * associated with. * @@ -80,6 +82,7 @@ struct device_private { struct klist_node knode_parent; struct klist_node knode_driver; struct klist_node knode_bus; + void *driver_data; struct device *device; }; #define to_device_private_parent(obj) \ @@ -89,6 +92,8 @@ struct device_private { #define to_device_private_bus(obj) \ container_of(obj, struct device_private, knode_bus) +extern int device_private_init(struct device *dev); + /* initialisation functions */ extern int devices_init(void); extern int buses_init(void); @@ -104,7 +109,7 @@ extern int system_bus_init(void); extern int cpu_dev_init(void); extern int bus_add_device(struct device *dev); -extern void bus_attach_device(struct device *dev); +extern void bus_probe_device(struct device *dev); extern void bus_remove_device(struct device *dev); extern int bus_add_driver(struct device_driver *drv); @@ -134,3 +139,9 @@ static inline void module_add_driver(struct module *mod, struct device_driver *drv) { } static inline void module_remove_driver(struct device_driver *drv) { } #endif + +#ifdef CONFIG_DEVTMPFS +extern int devtmpfs_init(void); +#else +static inline int devtmpfs_init(void) { return 0; } +#endif diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 4b04a15146d..973bf2ad4e0 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -459,8 +459,9 @@ static inline void remove_deprecated_bus_links(struct device *dev) { } * bus_add_device - add device to bus * @dev: device being added * + * - Add device's bus attributes. + * - Create links to device's bus. * - Add the device to its bus's list of devices. - * - Create link to device's bus. */ int bus_add_device(struct device *dev) { @@ -483,6 +484,7 @@ int bus_add_device(struct device *dev) error = make_deprecated_bus_links(dev); if (error) goto out_deprecated; + klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices); } return 0; @@ -498,24 +500,19 @@ out_put: } /** - * bus_attach_device - add device to bus - * @dev: device tried to attach to a driver + * bus_probe_device - probe drivers for a new device + * @dev: device to probe * - * - Add device to bus's list of devices. - * - Try to attach to driver. + * - Automatically probe for a driver if the bus allows it. */ -void bus_attach_device(struct device *dev) +void bus_probe_device(struct device *dev) { struct bus_type *bus = dev->bus; - int ret = 0; + int ret; - if (bus) { - if (bus->p->drivers_autoprobe) - ret = device_attach(dev); + if (bus && bus->p->drivers_autoprobe) { + ret = device_attach(dev); WARN_ON(ret < 0); - if (ret >= 0) - klist_add_tail(&dev->p->knode_bus, - &bus->p->klist_devices); } } diff --git a/drivers/base/class.c b/drivers/base/class.c index eb85e431230..161746deab4 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -488,6 +488,93 @@ void class_interface_unregister(struct class_interface *class_intf) class_put(parent); } +struct class_compat { + struct kobject *kobj; +}; + +/** + * class_compat_register - register a compatibility class + * @name: the name of the class + * + * Compatibility class are meant as a temporary user-space compatibility + * workaround when converting a family of class devices to a bus devices. + */ +struct class_compat *class_compat_register(const char *name) +{ + struct class_compat *cls; + + cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL); + if (!cls) + return NULL; + cls->kobj = kobject_create_and_add(name, &class_kset->kobj); + if (!cls->kobj) { + kfree(cls); + return NULL; + } + return cls; +} +EXPORT_SYMBOL_GPL(class_compat_register); + +/** + * class_compat_unregister - unregister a compatibility class + * @cls: the class to unregister + */ +void class_compat_unregister(struct class_compat *cls) +{ + kobject_put(cls->kobj); + kfree(cls); +} +EXPORT_SYMBOL_GPL(class_compat_unregister); + +/** + * class_compat_create_link - create a compatibility class device link to + * a bus device + * @cls: the compatibility class + * @dev: the target bus device + * @device_link: an optional device to which a "device" link should be created + */ +int class_compat_create_link(struct class_compat *cls, struct device *dev, + struct device *device_link) +{ + int error; + + error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev)); + if (error) + return error; + + /* + * Optionally add a "device" link (typically to the parent), as a + * class device would have one and we want to provide as much + * backwards compatibility as possible. + */ + if (device_link) { + error = sysfs_create_link(&dev->kobj, &device_link->kobj, + "device"); + if (error) + sysfs_remove_link(cls->kobj, dev_name(dev)); + } + + return error; +} +EXPORT_SYMBOL_GPL(class_compat_create_link); + +/** + * class_compat_remove_link - remove a compatibility class device link to + * a bus device + * @cls: the compatibility class + * @dev: the target bus device + * @device_link: an optional device to which a "device" link was previously + * created + */ +void class_compat_remove_link(struct class_compat *cls, struct device *dev, + struct device *device_link) +{ + if (device_link) + sysfs_remove_link(&dev->kobj, "device"); + sysfs_remove_link(cls->kobj, dev_name(dev)); +} +EXPORT_SYMBOL_GPL(class_compat_remove_link); + int __init classes_init(void) { class_kset = kset_create_and_add("class", NULL, NULL); diff --git a/drivers/base/core.c b/drivers/base/core.c index 7ecb1938e59..390e664ec1c 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -341,7 +341,7 @@ static void device_remove_attributes(struct device *dev, } static int device_add_groups(struct device *dev, - struct attribute_group **groups) + const struct attribute_group **groups) { int error = 0; int i; @@ -361,7 +361,7 @@ static int device_add_groups(struct device *dev, } static void device_remove_groups(struct device *dev, - struct attribute_group **groups) + const struct attribute_group **groups) { int i; @@ -843,6 +843,17 @@ static void device_remove_sys_dev_entry(struct device *dev) } } +int device_private_init(struct device *dev) +{ + dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); + if (!dev->p) + return -ENOMEM; + dev->p->device = dev; + klist_init(&dev->p->klist_children, klist_children_get, + klist_children_put); + return 0; +} + /** * device_add - add device to device hierarchy. * @dev: device. @@ -868,14 +879,11 @@ int device_add(struct device *dev) if (!dev) goto done; - dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); if (!dev->p) { - error = -ENOMEM; - goto done; + error = device_private_init(dev); + if (error) + goto done; } - dev->p->device = dev; - klist_init(&dev->p->klist_children, klist_children_get, - klist_children_put); /* * for statically allocated devices, which should all be converted @@ -921,6 +929,8 @@ int device_add(struct device *dev) error = device_create_sys_dev_entry(dev); if (error) goto devtattrError; + + devtmpfs_create_node(dev); } error = device_add_class_symlinks(dev); @@ -945,7 +955,7 @@ int device_add(struct device *dev) BUS_NOTIFY_ADD_DEVICE, dev); kobject_uevent(&dev->kobj, KOBJ_ADD); - bus_attach_device(dev); + bus_probe_device(dev); if (parent) klist_add_tail(&dev->p->knode_parent, &parent->p->klist_children); @@ -1067,6 +1077,7 @@ void device_del(struct device *dev) if (parent) klist_del(&dev->p->knode_parent); if (MAJOR(dev->devt)) { + devtmpfs_delete_node(dev); device_remove_sys_dev_entry(dev); device_remove_file(dev, &devt_attr); } diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 7b34b3a48f6..979d159b5cd 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -11,8 +11,8 @@ * * Copyright (c) 2002-5 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs - * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de> - * Copyright (c) 2007 Novell Inc. + * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2007-2009 Novell Inc. * * This file is released under the GPLv2 */ @@ -391,3 +391,30 @@ void driver_detach(struct device_driver *drv) put_device(dev); } } + +/* + * These exports can't be _GPL due to .h files using this within them, and it + * might break something that was previously working... + */ +void *dev_get_drvdata(const struct device *dev) +{ + if (dev && dev->p) + return dev->p->driver_data; + return NULL; +} +EXPORT_SYMBOL(dev_get_drvdata); + +void dev_set_drvdata(struct device *dev, void *data) +{ + int error; + + if (!dev) + return; + if (!dev->p) { + error = device_private_init(dev); + if (error) + return; + } + dev->p->driver_data = data; +} +EXPORT_SYMBOL(dev_set_drvdata); diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c new file mode 100644 index 00000000000..fd488ad4263 --- /dev/null +++ b/drivers/base/devtmpfs.c @@ -0,0 +1,367 @@ +/* + * devtmpfs - kernel-maintained tmpfs-based /dev + * + * Copyright (C) 2009, Kay Sievers <kay.sievers@vrfy.org> + * + * During bootup, before any driver core device is registered, + * devtmpfs, a tmpfs-based filesystem is created. Every driver-core + * device which requests a device node, will add a node in this + * filesystem. The node is named after the the name of the device, + * or the susbsytem can provide a custom name. All devices are + * owned by root and have a mode of 0600. + */ + +#include <linux/kernel.h> +#include <linux/syscalls.h> +#include <linux/mount.h> +#include <linux/device.h> +#include <linux/genhd.h> +#include <linux/namei.h> +#include <linux/fs.h> +#include <linux/shmem_fs.h> +#include <linux/cred.h> +#include <linux/init_task.h> + +static struct vfsmount *dev_mnt; + +#if defined CONFIG_DEVTMPFS_MOUNT +static int dev_mount = 1; +#else +static int dev_mount; +#endif + +static int __init mount_param(char *str) +{ + dev_mount = simple_strtoul(str, NULL, 0); + return 1; +} +__setup("devtmpfs.mount=", mount_param); + +static int dev_get_sb(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data, struct vfsmount *mnt) +{ + return get_sb_single(fs_type, flags, data, shmem_fill_super, mnt); +} + +static struct file_system_type dev_fs_type = { + .name = "devtmpfs", + .get_sb = dev_get_sb, + .kill_sb = kill_litter_super, +}; + +#ifdef CONFIG_BLOCK +static inline int is_blockdev(struct device *dev) +{ + return dev->class == &block_class; +} +#else +static inline int is_blockdev(struct device *dev) { return 0; } +#endif + +static int dev_mkdir(const char *name, mode_t mode) +{ + struct nameidata nd; + struct dentry *dentry; + int err; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + name, LOOKUP_PARENT, &nd); + if (err) + return err; + + dentry = lookup_create(&nd, 1); + if (!IS_ERR(dentry)) { + err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode); + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + return err; +} + +static int create_path(const char *nodepath) +{ + char *path; + struct nameidata nd; + int err = 0; + + path = kstrdup(nodepath, GFP_KERNEL); + if (!path) + return -ENOMEM; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + path, LOOKUP_PARENT, &nd); + if (err == 0) { + struct dentry *dentry; + + /* create directory right away */ + dentry = lookup_create(&nd, 1); + if (!IS_ERR(dentry)) { + err = vfs_mkdir(nd.path.dentry->d_inode, + dentry, 0755); + dput(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + } else if (err == -ENOENT) { + char *s; + + /* parent directories do not exist, create them */ + s = path; + while (1) { + s = strchr(s, '/'); + if (!s) + break; + s[0] = '\0'; + err = dev_mkdir(path, 0755); + if (err && err != -EEXIST) + break; + s[0] = '/'; + s++; + } + } + + kfree(path); + return err; +} + +int devtmpfs_create_node(struct device *dev) +{ + const char *tmp = NULL; + const char *nodename; + const struct cred *curr_cred; + mode_t mode; + struct nameidata nd; + struct dentry *dentry; + int err; + + if (!dev_mnt) + return 0; + + nodename = device_get_nodename(dev, &tmp); + if (!nodename) + return -ENOMEM; + + if (is_blockdev(dev)) + mode = S_IFBLK|0600; + else + mode = S_IFCHR|0600; + + curr_cred = override_creds(&init_cred); + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + nodename, LOOKUP_PARENT, &nd); + if (err == -ENOENT) { + /* create missing parent directories */ + create_path(nodename); + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + nodename, LOOKUP_PARENT, &nd); + if (err) + goto out; + } + + dentry = lookup_create(&nd, 0); + if (!IS_ERR(dentry)) { + err = vfs_mknod(nd.path.dentry->d_inode, + dentry, mode, dev->devt); + /* mark as kernel created inode */ + if (!err) + dentry->d_inode->i_private = &dev_mnt; + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); +out: + kfree(tmp); + revert_creds(curr_cred); + return err; +} + +static int dev_rmdir(const char *name) +{ + struct nameidata nd; + struct dentry *dentry; + int err; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + name, LOOKUP_PARENT, &nd); + if (err) + return err; + + mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); + dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); + if (!IS_ERR(dentry)) { + if (dentry->d_inode) + err = vfs_rmdir(nd.path.dentry->d_inode, dentry); + else + err = -ENOENT; + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + return err; +} + +static int delete_path(const char *nodepath) +{ + const char *path; + int err = 0; + + path = kstrdup(nodepath, GFP_KERNEL); + if (!path) + return -ENOMEM; + + while (1) { + char *base; + + base = strrchr(path, '/'); + if (!base) + break; + base[0] = '\0'; + err = dev_rmdir(path); + if (err) + break; + } + + kfree(path); + return err; +} + +static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *stat) +{ + /* did we create it */ + if (inode->i_private != &dev_mnt) + return 0; + + /* does the dev_t match */ + if (is_blockdev(dev)) { + if (!S_ISBLK(stat->mode)) + return 0; + } else { + if (!S_ISCHR(stat->mode)) + return 0; + } + if (stat->rdev != dev->devt) + return 0; + + /* ours */ + return 1; +} + +int devtmpfs_delete_node(struct device *dev) +{ + const char *tmp = NULL; + const char *nodename; + const struct cred *curr_cred; + struct nameidata nd; + struct dentry *dentry; + struct kstat stat; + int deleted = 1; + int err; + + if (!dev_mnt) + return 0; + + nodename = device_get_nodename(dev, &tmp); + if (!nodename) + return -ENOMEM; + + curr_cred = override_creds(&init_cred); + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + nodename, LOOKUP_PARENT, &nd); + if (err) + goto out; + + mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); + dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); + if (!IS_ERR(dentry)) { + if (dentry->d_inode) { + err = vfs_getattr(nd.path.mnt, dentry, &stat); + if (!err && dev_mynode(dev, dentry->d_inode, &stat)) { + err = vfs_unlink(nd.path.dentry->d_inode, + dentry); + if (!err || err == -ENOENT) + deleted = 1; + } + } else { + err = -ENOENT; + } + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + if (deleted && strchr(nodename, '/')) + delete_path(nodename); +out: + kfree(tmp); + revert_creds(curr_cred); + return err; +} + +/* + * If configured, or requested by the commandline, devtmpfs will be + * auto-mounted after the kernel mounted the root filesystem. + */ +int devtmpfs_mount(const char *mountpoint) +{ + struct path path; + int err; + + if (!dev_mount) + return 0; + + if (!dev_mnt) + return 0; + + err = kern_path(mountpoint, LOOKUP_FOLLOW, &path); + if (err) + return err; + err = do_add_mount(dev_mnt, &path, 0, NULL); + if (err) + printk(KERN_INFO "devtmpfs: error mounting %i\n", err); + else + printk(KERN_INFO "devtmpfs: mounted\n"); + path_put(&path); + return err; +} + +/* + * Create devtmpfs instance, driver-core devices will add their device + * nodes here. + */ +int __init devtmpfs_init(void) +{ + int err; + struct vfsmount *mnt; + + err = register_filesystem(&dev_fs_type); + if (err) { + printk(KERN_ERR "devtmpfs: unable to register devtmpfs " + "type %i\n", err); + return err; + } + + mnt = kern_mount(&dev_fs_type); + if (IS_ERR(mnt)) { + err = PTR_ERR(mnt); + printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err); + unregister_filesystem(&dev_fs_type); + return err; + } + dev_mnt = mnt; + + printk(KERN_INFO "devtmpfs: initialized\n"); + return 0; +} diff --git a/kernel/dma-coherent.c b/drivers/base/dma-coherent.c index 962a3b574f2..962a3b574f2 100644 --- a/kernel/dma-coherent.c +++ b/drivers/base/dma-coherent.c diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 8ae0f63602e..ed2ebd3c287 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -181,7 +181,7 @@ void put_driver(struct device_driver *drv) EXPORT_SYMBOL_GPL(put_driver); static int driver_add_groups(struct device_driver *drv, - struct attribute_group **groups) + const struct attribute_group **groups) { int error = 0; int i; @@ -201,7 +201,7 @@ static int driver_add_groups(struct device_driver *drv, } static void driver_remove_groups(struct device_driver *drv, - struct attribute_group **groups) + const struct attribute_group **groups) { int i; diff --git a/drivers/base/init.c b/drivers/base/init.c index 7bd9b6a5b01..c8a934e7942 100644 --- a/drivers/base/init.c +++ b/drivers/base/init.c @@ -20,6 +20,7 @@ void __init driver_init(void) { /* These are the core pieces */ + devtmpfs_init(); devices_init(); buses_init(); classes_init(); diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 0f7d434ce98..ed156a13aa4 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -10,6 +10,7 @@ * information. */ +#include <linux/string.h> #include <linux/platform_device.h> #include <linux/module.h> #include <linux/init.h> @@ -213,14 +214,13 @@ EXPORT_SYMBOL_GPL(platform_device_add_resources); int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size) { - void *d; + void *d = kmemdup(data, size, GFP_KERNEL); - d = kmalloc(size, GFP_KERNEL); if (d) { - memcpy(d, data, size); pdev->dev.platform_data = d; + return 0; } - return d ? 0 : -ENOMEM; + return -ENOMEM; } EXPORT_SYMBOL_GPL(platform_device_add_data); diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 0589dfbbd7d..d8372b43282 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -572,7 +572,7 @@ static struct attribute_group cciss_dev_attr_group = { .attrs = cciss_dev_attrs, }; -static struct attribute_group *cciss_dev_attr_groups[] = { +static const struct attribute_group *cciss_dev_attr_groups[] = { &cciss_dev_attr_group, NULL }; diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index 99a506f619b..95f11cdef20 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -92,7 +92,7 @@ static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ static mempool_t *psd_pool; static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ -static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */ +static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ /* forward declaration */ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 645237bda68..0491cdf63f2 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -864,71 +864,67 @@ static const struct file_operations kmsg_fops = { .write = kmsg_write, }; -static const struct { - unsigned int minor; - char *name; - umode_t mode; - const struct file_operations *fops; - struct backing_dev_info *dev_info; -} devlist[] = { /* list of minor devices */ - {1, "mem", S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops, - &directly_mappable_cdev_bdi}, +static const struct memdev { + const char *name; + const struct file_operations *fops; + struct backing_dev_info *dev_info; +} devlist[] = { + [ 1] = { "mem", &mem_fops, &directly_mappable_cdev_bdi }, #ifdef CONFIG_DEVKMEM - {2, "kmem", S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops, - &directly_mappable_cdev_bdi}, + [ 2] = { "kmem", &kmem_fops, &directly_mappable_cdev_bdi }, #endif - {3, "null", S_IRUGO | S_IWUGO, &null_fops, NULL}, + [ 3] = {"null", &null_fops, NULL }, #ifdef CONFIG_DEVPORT - {4, "port", S_IRUSR | S_IWUSR | S_IRGRP, &port_fops, NULL}, + [ 4] = { "port", &port_fops, NULL }, #endif - {5, "zero", S_IRUGO | S_IWUGO, &zero_fops, &zero_bdi}, - {7, "full", S_IRUGO | S_IWUGO, &full_fops, NULL}, - {8, "random", S_IRUGO | S_IWUSR, &random_fops, NULL}, - {9, "urandom", S_IRUGO | S_IWUSR, &urandom_fops, NULL}, - {11,"kmsg", S_IRUGO | S_IWUSR, &kmsg_fops, NULL}, + [ 5] = { "zero", &zero_fops, &zero_bdi }, + [ 7] = { "full", &full_fops, NULL }, + [ 8] = { "random", &random_fops, NULL }, + [ 9] = { "urandom", &urandom_fops, NULL }, + [11] = { "kmsg", &kmsg_fops, NULL }, #ifdef CONFIG_CRASH_DUMP - {12,"oldmem", S_IRUSR | S_IWUSR | S_IRGRP, &oldmem_fops, NULL}, + [12] = { "oldmem", &oldmem_fops, NULL }, #endif }; static int memory_open(struct inode *inode, struct file *filp) { - int ret = 0; - int i; + int minor; + const struct memdev *dev; + int ret = -ENXIO; lock_kernel(); - for (i = 0; i < ARRAY_SIZE(devlist); i++) { - if (devlist[i].minor == iminor(inode)) { - filp->f_op = devlist[i].fops; - if (devlist[i].dev_info) { - filp->f_mapping->backing_dev_info = - devlist[i].dev_info; - } + minor = iminor(inode); + if (minor >= ARRAY_SIZE(devlist)) + goto out; - break; - } - } + dev = &devlist[minor]; + if (!dev->fops) + goto out; - if (i == ARRAY_SIZE(devlist)) - ret = -ENXIO; - else - if (filp->f_op && filp->f_op->open) - ret = filp->f_op->open(inode, filp); + filp->f_op = dev->fops; + if (dev->dev_info) + filp->f_mapping->backing_dev_info = dev->dev_info; + if (dev->fops->open) + ret = dev->fops->open(inode, filp); + else + ret = 0; +out: unlock_kernel(); return ret; } static const struct file_operations memory_fops = { - .open = memory_open, /* just a selector for the real open */ + .open = memory_open, }; static struct class *mem_class; static int __init chr_dev_init(void) { - int i; + int minor; int err; err = bdi_init(&zero_bdi); @@ -939,10 +935,12 @@ static int __init chr_dev_init(void) printk("unable to get major %d for memory devs\n", MEM_MAJOR); mem_class = class_create(THIS_MODULE, "mem"); - for (i = 0; i < ARRAY_SIZE(devlist); i++) - device_create(mem_class, NULL, - MKDEV(MEM_MAJOR, devlist[i].minor), NULL, - devlist[i].name); + for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) { + if (!devlist[minor].name) + continue; + device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor), + NULL, devlist[minor].name); + } return 0; } diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index 97e656af2d2..9d0dfcbe2c1 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -312,7 +312,7 @@ static void init_fw_attribute_group(struct device *dev, group->groups[0] = &group->group; group->groups[1] = NULL; group->group.attrs = group->attrs; - dev->groups = group->groups; + dev->groups = (const struct attribute_group **) group->groups; } static ssize_t modalias_show(struct device *dev, diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c index 5a76d056b9d..dbdf6fadfc7 100644 --- a/drivers/firmware/dmi-id.c +++ b/drivers/firmware/dmi-id.c @@ -139,7 +139,7 @@ static struct attribute_group sys_dmi_attribute_group = { .attrs = sys_dmi_attributes, }; -static struct attribute_group* sys_dmi_attribute_groups[] = { +static const struct attribute_group* sys_dmi_attribute_groups[] = { &sys_dmi_attribute_group, NULL }; diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c index 5b635aa5947..fb2d83c5bf0 100644 --- a/drivers/infiniband/hw/ehca/ehca_main.c +++ b/drivers/infiniband/hw/ehca/ehca_main.c @@ -623,7 +623,7 @@ static struct attribute_group ehca_drv_attr_grp = { .attrs = ehca_drv_attrs }; -static struct attribute_group *ehca_drv_attr_groups[] = { +static const struct attribute_group *ehca_drv_attr_groups[] = { &ehca_drv_attr_grp, NULL, }; diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h index 6ba4861dd6a..b3d7efcdf02 100644 --- a/drivers/infiniband/hw/ipath/ipath_kernel.h +++ b/drivers/infiniband/hw/ipath/ipath_kernel.h @@ -1286,7 +1286,7 @@ struct device_driver; extern const char ib_ipath_version[]; -extern struct attribute_group *ipath_driver_attr_groups[]; +extern const struct attribute_group *ipath_driver_attr_groups[]; int ipath_device_create_group(struct device *, struct ipath_devdata *); void ipath_device_remove_group(struct device *, struct ipath_devdata *); diff --git a/drivers/infiniband/hw/ipath/ipath_sysfs.c b/drivers/infiniband/hw/ipath/ipath_sysfs.c index a6c8efbdc0c..b8cb2f145ae 100644 --- a/drivers/infiniband/hw/ipath/ipath_sysfs.c +++ b/drivers/infiniband/hw/ipath/ipath_sysfs.c @@ -1069,7 +1069,7 @@ static ssize_t show_tempsense(struct device *dev, return ret; } -struct attribute_group *ipath_driver_attr_groups[] = { +const struct attribute_group *ipath_driver_attr_groups[] = { &driver_attr_group, NULL, }; diff --git a/drivers/input/input.c b/drivers/input/input.c index 7c237e6ac71..851791d955f 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -1144,7 +1144,7 @@ static struct attribute_group input_dev_caps_attr_group = { .attrs = input_dev_caps_attrs, }; -static struct attribute_group *input_dev_attr_groups[] = { +static const struct attribute_group *input_dev_attr_groups[] = { &input_dev_attr_group, &input_dev_id_attr_group, &input_dev_caps_attr_group, diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 7b039306037..e9eae4a7840 100644 --- a/drivers/misc/enclosure.c +++ b/drivers/misc/enclosure.c @@ -238,7 +238,7 @@ static void enclosure_component_release(struct device *dev) put_device(dev->parent); } -static struct attribute_group *enclosure_groups[]; +static const struct attribute_group *enclosure_groups[]; /** * enclosure_component_register - add a particular component to an enclosure @@ -536,7 +536,7 @@ static struct attribute_group enclosure_group = { .attrs = enclosure_component_attrs, }; -static struct attribute_group *enclosure_groups[] = { +static const struct attribute_group *enclosure_groups[] = { &enclosure_group, NULL }; diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c index 880ccf39e23..1ad27c6abcc 100644 --- a/drivers/misc/hpilo.c +++ b/drivers/misc/hpilo.c @@ -13,6 +13,7 @@ #include <linux/module.h> #include <linux/fs.h> #include <linux/pci.h> +#include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/device.h> #include <linux/file.h> @@ -21,6 +22,8 @@ #include <linux/delay.h> #include <linux/uaccess.h> #include <linux/io.h> +#include <linux/wait.h> +#include <linux/poll.h> #include "hpilo.h" static struct class *ilo_class; @@ -61,9 +64,10 @@ static inline int desc_mem_sz(int nr_entry) static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) { struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); + unsigned long flags; int ret = 0; - spin_lock(&hw->fifo_lock); + spin_lock_irqsave(&hw->fifo_lock, flags); if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask] & ENTRY_MASK_O)) { fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |= @@ -71,7 +75,7 @@ static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) fifo_q->tail += 1; ret = 1; } - spin_unlock(&hw->fifo_lock); + spin_unlock_irqrestore(&hw->fifo_lock, flags); return ret; } @@ -79,10 +83,11 @@ static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) { struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); + unsigned long flags; int ret = 0; u64 c; - spin_lock(&hw->fifo_lock); + spin_lock_irqsave(&hw->fifo_lock, flags); c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; if (c & ENTRY_MASK_C) { if (entry) @@ -93,7 +98,23 @@ static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) fifo_q->head += 1; ret = 1; } - spin_unlock(&hw->fifo_lock); + spin_unlock_irqrestore(&hw->fifo_lock, flags); + + return ret; +} + +static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar) +{ + struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); + unsigned long flags; + int ret = 0; + u64 c; + + spin_lock_irqsave(&hw->fifo_lock, flags); + c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; + if (c & ENTRY_MASK_C) + ret = 1; + spin_unlock_irqrestore(&hw->fifo_lock, flags); return ret; } @@ -142,6 +163,13 @@ static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb, return ret; } +static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb) +{ + char *fifobar = ccb->ccb_u3.recv_fifobar; + + return fifo_check_recv(hw, fifobar); +} + static inline void doorbell_set(struct ccb *ccb) { iowrite8(1, ccb->ccb_u5.db_base); @@ -151,6 +179,7 @@ static inline void doorbell_clr(struct ccb *ccb) { iowrite8(2, ccb->ccb_u5.db_base); } + static inline int ctrl_set(int l2sz, int idxmask, int desclim) { int active = 0, go = 1; @@ -160,6 +189,7 @@ static inline int ctrl_set(int l2sz, int idxmask, int desclim) active << CTRL_BITPOS_A | go << CTRL_BITPOS_G; } + static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz) { /* for simplicity, use the same parameters for send and recv ctrls */ @@ -192,13 +222,10 @@ static void fifo_setup(void *base_addr, int nr_entry) static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data) { - struct ccb *driver_ccb; - struct ccb __iomem *device_ccb; + struct ccb *driver_ccb = &data->driver_ccb; + struct ccb __iomem *device_ccb = data->mapped_ccb; int retries; - driver_ccb = &data->driver_ccb; - device_ccb = data->mapped_ccb; - /* complicated dance to tell the hw we are stopping */ doorbell_clr(driver_ccb); iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G), @@ -225,26 +252,22 @@ static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data) pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa); } -static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) +static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) { char *dma_va, *dma_pa; - int pkt_id, pkt_sz, i, error; struct ccb *driver_ccb, *ilo_ccb; - struct pci_dev *pdev; driver_ccb = &data->driver_ccb; ilo_ccb = &data->ilo_ccb; - pdev = hw->ilo_dev; data->dma_size = 2 * fifo_sz(NR_QENTRY) + 2 * desc_mem_sz(NR_QENTRY) + ILO_START_ALIGN + ILO_CACHE_SZ; - error = -ENOMEM; - data->dma_va = pci_alloc_consistent(pdev, data->dma_size, + data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size, &data->dma_pa); if (!data->dma_va) - goto out; + return -ENOMEM; dma_va = (char *)data->dma_va; dma_pa = (char *)data->dma_pa; @@ -290,10 +313,18 @@ static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE); ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */ + return 0; +} + +static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) +{ + int pkt_id, pkt_sz; + struct ccb *driver_ccb = &data->driver_ccb; + /* copy the ccb with physical addrs to device memory */ data->mapped_ccb = (struct ccb __iomem *) (hw->ram_vaddr + (slot * ILOHW_CCB_SZ)); - memcpy_toio(data->mapped_ccb, ilo_ccb, sizeof(struct ccb)); + memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb)); /* put packets on the send and receive queues */ pkt_sz = 0; @@ -306,7 +337,14 @@ static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz); + /* the ccb is ready to use */ doorbell_clr(driver_ccb); +} + +static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data) +{ + int pkt_id, i; + struct ccb *driver_ccb = &data->driver_ccb; /* make sure iLO is really handling requests */ for (i = MAX_WAIT; i > 0; i--) { @@ -315,20 +353,14 @@ static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) udelay(WAIT_TIME); } - if (i) { - ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); - doorbell_set(driver_ccb); - } else { - dev_err(&pdev->dev, "Open could not dequeue a packet\n"); - error = -EBUSY; - goto free; + if (i == 0) { + dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); + return -EBUSY; } + ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); + doorbell_set(driver_ccb); return 0; -free: - ilo_ccb_close(pdev, data); -out: - return error; } static inline int is_channel_reset(struct ccb *ccb) @@ -343,19 +375,45 @@ static inline void set_channel_reset(struct ccb *ccb) FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; } +static inline int get_device_outbound(struct ilo_hwinfo *hw) +{ + return ioread32(&hw->mmio_vaddr[DB_OUT]); +} + +static inline int is_db_reset(int db_out) +{ + return db_out & (1 << DB_RESET); +} + static inline int is_device_reset(struct ilo_hwinfo *hw) { /* check for global reset condition */ - return ioread32(&hw->mmio_vaddr[DB_OUT]) & (1 << DB_RESET); + return is_db_reset(get_device_outbound(hw)); +} + +static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr) +{ + iowrite32(clr, &hw->mmio_vaddr[DB_OUT]); } static inline void clear_device(struct ilo_hwinfo *hw) { /* clear the device (reset bits, pending channel entries) */ - iowrite32(-1, &hw->mmio_vaddr[DB_OUT]); + clear_pending_db(hw, -1); +} + +static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw) +{ + iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]); } -static void ilo_locked_reset(struct ilo_hwinfo *hw) +static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw) +{ + iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1, + &hw->mmio_vaddr[DB_IRQ]); +} + +static void ilo_set_reset(struct ilo_hwinfo *hw) { int slot; @@ -368,40 +426,22 @@ static void ilo_locked_reset(struct ilo_hwinfo *hw) continue; set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb); } - - clear_device(hw); -} - -static void ilo_reset(struct ilo_hwinfo *hw) -{ - spin_lock(&hw->alloc_lock); - - /* reset might have been handled after lock was taken */ - if (is_device_reset(hw)) - ilo_locked_reset(hw); - - spin_unlock(&hw->alloc_lock); } static ssize_t ilo_read(struct file *fp, char __user *buf, size_t len, loff_t *off) { int err, found, cnt, pkt_id, pkt_len; - struct ccb_data *data; - struct ccb *driver_ccb; - struct ilo_hwinfo *hw; + struct ccb_data *data = fp->private_data; + struct ccb *driver_ccb = &data->driver_ccb; + struct ilo_hwinfo *hw = data->ilo_hw; void *pkt; - data = fp->private_data; - driver_ccb = &data->driver_ccb; - hw = data->ilo_hw; - - if (is_device_reset(hw) || is_channel_reset(driver_ccb)) { + if (is_channel_reset(driver_ccb)) { /* * If the device has been reset, applications * need to close and reopen all ccbs. */ - ilo_reset(hw); return -ENODEV; } @@ -442,23 +482,13 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf, size_t len, loff_t *off) { int err, pkt_id, pkt_len; - struct ccb_data *data; - struct ccb *driver_ccb; - struct ilo_hwinfo *hw; + struct ccb_data *data = fp->private_data; + struct ccb *driver_ccb = &data->driver_ccb; + struct ilo_hwinfo *hw = data->ilo_hw; void *pkt; - data = fp->private_data; - driver_ccb = &data->driver_ccb; - hw = data->ilo_hw; - - if (is_device_reset(hw) || is_channel_reset(driver_ccb)) { - /* - * If the device has been reset, applications - * need to close and reopen all ccbs. - */ - ilo_reset(hw); + if (is_channel_reset(driver_ccb)) return -ENODEV; - } /* get a packet to send the user command */ if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt)) @@ -480,32 +510,48 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf, return err ? -EFAULT : len; } +static unsigned int ilo_poll(struct file *fp, poll_table *wait) +{ + struct ccb_data *data = fp->private_data; + struct ccb *driver_ccb = &data->driver_ccb; + + poll_wait(fp, &data->ccb_waitq, wait); + + if (is_channel_reset(driver_ccb)) + return POLLERR; + else if (ilo_pkt_recv(data->ilo_hw, driver_ccb)) + return POLLIN | POLLRDNORM; + + return 0; +} + static int ilo_close(struct inode *ip, struct file *fp) { int slot; struct ccb_data *data; struct ilo_hwinfo *hw; + unsigned long flags; slot = iminor(ip) % MAX_CCB; hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); - spin_lock(&hw->alloc_lock); - - if (is_device_reset(hw)) - ilo_locked_reset(hw); + spin_lock(&hw->open_lock); if (hw->ccb_alloc[slot]->ccb_cnt == 1) { data = fp->private_data; + spin_lock_irqsave(&hw->alloc_lock, flags); + hw->ccb_alloc[slot] = NULL; + spin_unlock_irqrestore(&hw->alloc_lock, flags); + ilo_ccb_close(hw->ilo_dev, data); kfree(data); - hw->ccb_alloc[slot] = NULL; } else hw->ccb_alloc[slot]->ccb_cnt--; - spin_unlock(&hw->alloc_lock); + spin_unlock(&hw->open_lock); return 0; } @@ -515,6 +561,7 @@ static int ilo_open(struct inode *ip, struct file *fp) int slot, error; struct ccb_data *data; struct ilo_hwinfo *hw; + unsigned long flags; slot = iminor(ip) % MAX_CCB; hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); @@ -524,22 +571,42 @@ static int ilo_open(struct inode *ip, struct file *fp) if (!data) return -ENOMEM; - spin_lock(&hw->alloc_lock); - - if (is_device_reset(hw)) - ilo_locked_reset(hw); + spin_lock(&hw->open_lock); /* each fd private_data holds sw/hw view of ccb */ if (hw->ccb_alloc[slot] == NULL) { /* create a channel control block for this minor */ - error = ilo_ccb_open(hw, data, slot); - if (!error) { - hw->ccb_alloc[slot] = data; - hw->ccb_alloc[slot]->ccb_cnt = 1; - hw->ccb_alloc[slot]->ccb_excl = fp->f_flags & O_EXCL; - hw->ccb_alloc[slot]->ilo_hw = hw; - } else + error = ilo_ccb_setup(hw, data, slot); + if (error) { kfree(data); + goto out; + } + + data->ccb_cnt = 1; + data->ccb_excl = fp->f_flags & O_EXCL; + data->ilo_hw = hw; + init_waitqueue_head(&data->ccb_waitq); + + /* write the ccb to hw */ + spin_lock_irqsave(&hw->alloc_lock, flags); + ilo_ccb_open(hw, data, slot); + hw->ccb_alloc[slot] = data; + spin_unlock_irqrestore(&hw->alloc_lock, flags); + + /* make sure the channel is functional */ + error = ilo_ccb_verify(hw, data); + if (error) { + + spin_lock_irqsave(&hw->alloc_lock, flags); + hw->ccb_alloc[slot] = NULL; + spin_unlock_irqrestore(&hw->alloc_lock, flags); + + ilo_ccb_close(hw->ilo_dev, data); + + kfree(data); + goto out; + } + } else { kfree(data); if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { @@ -554,7 +621,8 @@ static int ilo_open(struct inode *ip, struct file *fp) error = 0; } } - spin_unlock(&hw->alloc_lock); +out: + spin_unlock(&hw->open_lock); if (!error) fp->private_data = hw->ccb_alloc[slot]; @@ -566,10 +634,46 @@ static const struct file_operations ilo_fops = { .owner = THIS_MODULE, .read = ilo_read, .write = ilo_write, + .poll = ilo_poll, .open = ilo_open, .release = ilo_close, }; +static irqreturn_t ilo_isr(int irq, void *data) +{ + struct ilo_hwinfo *hw = data; + int pending, i; + + spin_lock(&hw->alloc_lock); + + /* check for ccbs which have data */ + pending = get_device_outbound(hw); + if (!pending) { + spin_unlock(&hw->alloc_lock); + return IRQ_NONE; + } + + if (is_db_reset(pending)) { + /* wake up all ccbs if the device was reset */ + pending = -1; + ilo_set_reset(hw); + } + + for (i = 0; i < MAX_CCB; i++) { + if (!hw->ccb_alloc[i]) + continue; + if (pending & (1 << i)) + wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq); + } + + /* clear the device of the channels that have been handled */ + clear_pending_db(hw, pending); + + spin_unlock(&hw->alloc_lock); + + return IRQ_HANDLED; +} + static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) { pci_iounmap(pdev, hw->db_vaddr); @@ -623,6 +727,8 @@ static void ilo_remove(struct pci_dev *pdev) device_destroy(ilo_class, MKDEV(ilo_major, i)); cdev_del(&ilo_hw->cdev); + ilo_disable_interrupts(ilo_hw); + free_irq(pdev->irq, ilo_hw); ilo_unmap_device(pdev, ilo_hw); pci_release_regions(pdev); pci_disable_device(pdev); @@ -658,6 +764,7 @@ static int __devinit ilo_probe(struct pci_dev *pdev, ilo_hw->ilo_dev = pdev; spin_lock_init(&ilo_hw->alloc_lock); spin_lock_init(&ilo_hw->fifo_lock); + spin_lock_init(&ilo_hw->open_lock); error = pci_enable_device(pdev); if (error) @@ -676,13 +783,19 @@ static int __devinit ilo_probe(struct pci_dev *pdev, pci_set_drvdata(pdev, ilo_hw); clear_device(ilo_hw); + error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw); + if (error) + goto unmap; + + ilo_enable_interrupts(ilo_hw); + cdev_init(&ilo_hw->cdev, &ilo_fops); ilo_hw->cdev.owner = THIS_MODULE; start = devnum * MAX_CCB; error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB); if (error) { dev_err(&pdev->dev, "Could not add cdev\n"); - goto unmap; + goto remove_isr; } for (minor = 0 ; minor < MAX_CCB; minor++) { @@ -695,6 +808,9 @@ static int __devinit ilo_probe(struct pci_dev *pdev, } return 0; +remove_isr: + ilo_disable_interrupts(ilo_hw); + free_irq(pdev->irq, ilo_hw); unmap: ilo_unmap_device(pdev, ilo_hw); free_regions: @@ -759,7 +875,7 @@ static void __exit ilo_exit(void) class_destroy(ilo_class); } -MODULE_VERSION("1.1"); +MODULE_VERSION("1.2"); MODULE_ALIAS(ILO_NAME); MODULE_DESCRIPTION(ILO_NAME); MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>"); diff --git a/drivers/misc/hpilo.h b/drivers/misc/hpilo.h index 03a14c82aad..38576050776 100644 --- a/drivers/misc/hpilo.h +++ b/drivers/misc/hpilo.h @@ -46,11 +46,14 @@ struct ilo_hwinfo { spinlock_t alloc_lock; spinlock_t fifo_lock; + spinlock_t open_lock; struct cdev cdev; }; -/* offset from mmio_vaddr */ +/* offset from mmio_vaddr for enabling doorbell interrupts */ +#define DB_IRQ 0xB2 +/* offset from mmio_vaddr for outbound communications */ #define DB_OUT 0xD4 /* DB_OUT reset bit */ #define DB_RESET 26 @@ -131,6 +134,9 @@ struct ccb_data { /* pointer to hardware device info */ struct ilo_hwinfo *ilo_hw; + /* queue for this ccb to wait for recv data */ + wait_queue_head_t ccb_waitq; + /* usage count, to allow for shared ccb's */ int ccb_cnt; diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 06084dbf127..2fb9d5f271e 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -276,7 +276,7 @@ static struct attribute_group mmc_std_attr_group = { .attrs = mmc_std_attrs, }; -static struct attribute_group *mmc_attr_groups[] = { +static const struct attribute_group *mmc_attr_groups[] = { &mmc_std_attr_group, NULL, }; diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index cd81c395e16..7ad646fe077 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -314,7 +314,7 @@ static struct attribute_group sd_std_attr_group = { .attrs = sd_std_attrs, }; -static struct attribute_group *sd_attr_groups[] = { +static const struct attribute_group *sd_attr_groups[] = { &sd_std_attr_group, NULL, }; diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 00ebf7af746..69007a6eff5 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -217,7 +217,7 @@ struct attribute_group mtd_group = { .attrs = mtd_attrs, }; -struct attribute_group *mtd_groups[] = { +const struct attribute_group *mtd_groups[] = { &mtd_group, NULL, }; diff --git a/drivers/net/wireless/iwmc3200wifi/Kconfig b/drivers/net/wireless/iwmc3200wifi/Kconfig index c62da435285..c25a04371ca 100644 --- a/drivers/net/wireless/iwmc3200wifi/Kconfig +++ b/drivers/net/wireless/iwmc3200wifi/Kconfig @@ -24,8 +24,8 @@ config IWM_DEBUG To see the list of debug modules and levels, see iwm/debug.h For example, if you want the full MLME debug output: - echo 0xff > /debug/iwm/phyN/debug/mlme + echo 0xff > /sys/kernel/debug/iwm/phyN/debug/mlme Or, if you want the full debug, for all modules: - echo 0xff > /debug/iwm/phyN/debug/level - echo 0xff > /debug/iwm/phyN/debug/modules + echo 0xff > /sys/kernel/debug/iwm/phyN/debug/level + echo 0xff > /sys/kernel/debug/iwm/phyN/debug/modules diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index e995123fd80..393c73c47f8 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -266,7 +266,7 @@ static struct attribute_group subch_attr_group = { .attrs = subch_attrs, }; -static struct attribute_group *default_subch_attr_groups[] = { +static const struct attribute_group *default_subch_attr_groups[] = { &subch_attr_group, NULL, }; diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 0f95405c2c5..6527f3f3449 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -656,7 +656,7 @@ static struct attribute_group ccwdev_attr_group = { .attrs = ccwdev_attrs, }; -static struct attribute_group *ccwdev_attr_groups[] = { +static const struct attribute_group *ccwdev_attr_groups[] = { &ccwdev_attr_group, NULL, }; diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c index 9215fbbccc0..a4b2c576144 100644 --- a/drivers/s390/net/netiucv.c +++ b/drivers/s390/net/netiucv.c @@ -2159,7 +2159,7 @@ static struct attribute_group netiucv_drv_attr_group = { .attrs = netiucv_drv_attrs, }; -static struct attribute_group *netiucv_drv_attr_groups[] = { +static const struct attribute_group *netiucv_drv_attr_groups[] = { &netiucv_drv_attr_group, NULL, }; diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index 021e503c8c4..1fbf7c78bba 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -132,7 +132,7 @@ extern struct scsi_transport_template blank_transport_template; extern void __scsi_remove_device(struct scsi_device *); extern struct bus_type scsi_bus_type; -extern struct attribute_group *scsi_sysfs_shost_attr_groups[]; +extern const struct attribute_group *scsi_sysfs_shost_attr_groups[]; /* scsi_netlink.c */ #ifdef CONFIG_SCSI_NETLINK diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 91482f2dcc5..fde54537d71 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -275,7 +275,7 @@ struct attribute_group scsi_shost_attr_group = { .attrs = scsi_sysfs_shost_attrs, }; -struct attribute_group *scsi_sysfs_shost_attr_groups[] = { +const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { &scsi_shost_attr_group, NULL }; @@ -745,7 +745,7 @@ static struct attribute_group scsi_sdev_attr_group = { .attrs = scsi_sdev_attrs, }; -static struct attribute_group *scsi_sdev_attr_groups[] = { +static const struct attribute_group *scsi_sdev_attr_groups[] = { &scsi_sdev_attr_group, NULL }; diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig index 7f86534de26..8aa1955f35e 100644 --- a/drivers/uio/Kconfig +++ b/drivers/uio/Kconfig @@ -1,7 +1,6 @@ menuconfig UIO tristate "Userspace I/O drivers" depends on !S390 - default n help Enable this to allow the userspace driver core code to be built. This code allows userspace programs easy access to @@ -16,7 +15,6 @@ if UIO config UIO_CIF tristate "generic Hilscher CIF Card driver" depends on PCI - default n help Driver for Hilscher CIF DeviceNet and Profibus cards. This driver requires a userspace component that handles all of the @@ -48,7 +46,6 @@ config UIO_PDRV_GENIRQ config UIO_SMX tristate "SMX cryptengine UIO interface" - default n help Userspace IO interface to the Cryptography engine found on the Nias Digital SMX boards. These will be available from Q4 2008 @@ -61,7 +58,6 @@ config UIO_SMX config UIO_AEC tristate "AEC video timestamp device" depends on PCI - default n help UIO driver for the Adrienne Electronics Corporation PCI time @@ -78,7 +74,6 @@ config UIO_AEC config UIO_SERCOS3 tristate "Automata Sercos III PCI card driver" - default n help Userspace I/O interface for the Sercos III PCI card from Automata GmbH. The userspace part of this driver will be @@ -89,4 +84,14 @@ config UIO_SERCOS3 If you compile this as a module, it will be called uio_sercos3. +config UIO_PCI_GENERIC + tristate "Generic driver for PCI 2.3 and PCI Express cards" + depends on PCI + default n + help + Generic driver that you can bind, dynamically, to any + PCI 2.3 compliant and PCI Express card. It is useful, + primarily, for virtualization scenarios. + If you compile this as a module, it will be called uio_pci_generic. + endif diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile index 5c2586d7579..73b2e751672 100644 --- a/drivers/uio/Makefile +++ b/drivers/uio/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_UIO_PDRV_GENIRQ) += uio_pdrv_genirq.o obj-$(CONFIG_UIO_SMX) += uio_smx.o obj-$(CONFIG_UIO_AEC) += uio_aec.o obj-$(CONFIG_UIO_SERCOS3) += uio_sercos3.o +obj-$(CONFIG_UIO_PCI_GENERIC) += uio_pci_generic.o diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c new file mode 100644 index 00000000000..313da35984a --- /dev/null +++ b/drivers/uio/uio_pci_generic.c @@ -0,0 +1,207 @@ +/* uio_pci_generic - generic UIO driver for PCI 2.3 devices + * + * Copyright (C) 2009 Red Hat, Inc. + * Author: Michael S. Tsirkin <mst@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. + * + * Since the driver does not declare any device ids, you must allocate + * id and bind the device to the driver yourself. For example: + * + * # echo "8086 10f5" > /sys/bus/pci/drivers/uio_pci_generic/new_id + * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind + * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/uio_pci_generic/bind + * # ls -l /sys/bus/pci/devices/0000:00:19.0/driver + * .../0000:00:19.0/driver -> ../../../bus/pci/drivers/uio_pci_generic + * + * Driver won't bind to devices which do not support the Interrupt Disable Bit + * in the command register. All devices compliant to PCI 2.3 (circa 2002) and + * all compliant PCI Express devices should support this bit. + */ + +#include <linux/device.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/uio_driver.h> +#include <linux/spinlock.h> + +#define DRIVER_VERSION "0.01.0" +#define DRIVER_AUTHOR "Michael S. Tsirkin <mst@redhat.com>" +#define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices" + +struct uio_pci_generic_dev { + struct uio_info info; + struct pci_dev *pdev; + spinlock_t lock; /* guards command register accesses */ +}; + +static inline struct uio_pci_generic_dev * +to_uio_pci_generic_dev(struct uio_info *info) +{ + return container_of(info, struct uio_pci_generic_dev, info); +} + +/* Interrupt handler. Read/modify/write the command register to disable + * the interrupt. */ +static irqreturn_t irqhandler(int irq, struct uio_info *info) +{ + struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info); + struct pci_dev *pdev = gdev->pdev; + irqreturn_t ret = IRQ_NONE; + u32 cmd_status_dword; + u16 origcmd, newcmd, status; + + /* We do a single dword read to retrieve both command and status. + * Document assumptions that make this possible. */ + BUILD_BUG_ON(PCI_COMMAND % 4); + BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS); + + spin_lock_irq(&gdev->lock); + pci_block_user_cfg_access(pdev); + + /* Read both command and status registers in a single 32-bit operation. + * Note: we could cache the value for command and move the status read + * out of the lock if there was a way to get notified of user changes + * to command register through sysfs. Should be good for shared irqs. */ + pci_read_config_dword(pdev, PCI_COMMAND, &cmd_status_dword); + origcmd = cmd_status_dword; + status = cmd_status_dword >> 16; + + /* Check interrupt status register to see whether our device + * triggered the interrupt. */ + if (!(status & PCI_STATUS_INTERRUPT)) + goto done; + + /* We triggered the interrupt, disable it. */ + newcmd = origcmd | PCI_COMMAND_INTX_DISABLE; + if (newcmd != origcmd) + pci_write_config_word(pdev, PCI_COMMAND, newcmd); + + /* UIO core will signal the user process. */ + ret = IRQ_HANDLED; +done: + + pci_unblock_user_cfg_access(pdev); + spin_unlock_irq(&gdev->lock); + return ret; +} + +/* Verify that the device supports Interrupt Disable bit in command register, + * per PCI 2.3, by flipping this bit and reading it back: this bit was readonly + * in PCI 2.2. */ +static int __devinit verify_pci_2_3(struct pci_dev *pdev) +{ + u16 orig, new; + int err = 0; + + pci_block_user_cfg_access(pdev); + pci_read_config_word(pdev, PCI_COMMAND, &orig); + pci_write_config_word(pdev, PCI_COMMAND, + orig ^ PCI_COMMAND_INTX_DISABLE); + pci_read_config_word(pdev, PCI_COMMAND, &new); + /* There's no way to protect against + * hardware bugs or detect them reliably, but as long as we know + * what the value should be, let's go ahead and check it. */ + if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) { + err = -EBUSY; + dev_err(&pdev->dev, "Command changed from 0x%x to 0x%x: " + "driver or HW bug?\n", orig, new); + goto err; + } + if (!((new ^ orig) & PCI_COMMAND_INTX_DISABLE)) { + dev_warn(&pdev->dev, "Device does not support " + "disabling interrupts: unable to bind.\n"); + err = -ENODEV; + goto err; + } + /* Now restore the original value. */ + pci_write_config_word(pdev, PCI_COMMAND, orig); +err: + pci_unblock_user_cfg_access(pdev); + return err; +} + +static int __devinit probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct uio_pci_generic_dev *gdev; + int err; + + if (!pdev->irq) { + dev_warn(&pdev->dev, "No IRQ assigned to device: " + "no support for interrupts?\n"); + return -ENODEV; + } + + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n", + __func__, err); + return err; + } + + err = verify_pci_2_3(pdev); + if (err) + goto err_verify; + + gdev = kzalloc(sizeof(struct uio_pci_generic_dev), GFP_KERNEL); + if (!gdev) { + err = -ENOMEM; + goto err_alloc; + } + + gdev->info.name = "uio_pci_generic"; + gdev->info.version = DRIVER_VERSION; + gdev->info.irq = pdev->irq; + gdev->info.irq_flags = IRQF_SHARED; + gdev->info.handler = irqhandler; + gdev->pdev = pdev; + spin_lock_init(&gdev->lock); + + if (uio_register_device(&pdev->dev, &gdev->info)) + goto err_register; + pci_set_drvdata(pdev, gdev); + + return 0; +err_register: + kfree(gdev); +err_alloc: +err_verify: + pci_disable_device(pdev); + return err; +} + +static void remove(struct pci_dev *pdev) +{ + struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev); + + uio_unregister_device(&gdev->info); + pci_disable_device(pdev); + kfree(gdev); +} + +static struct pci_driver driver = { + .name = "uio_pci_generic", + .id_table = NULL, /* only dynamic id's */ + .probe = probe, + .remove = remove, +}; + +static int __init init(void) +{ + pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); + return pci_register_driver(&driver); +} + +static void __exit cleanup(void) +{ + pci_unregister_driver(&driver); +} + +module_init(init); +module_exit(cleanup); + +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c index bc39fc40bbd..fdfaa788551 100644 --- a/drivers/usb/core/endpoint.c +++ b/drivers/usb/core/endpoint.c @@ -154,7 +154,7 @@ static struct attribute *ep_dev_attrs[] = { static struct attribute_group ep_dev_attr_grp = { .attrs = ep_dev_attrs, }; -static struct attribute_group *ep_dev_groups[] = { +static const struct attribute_group *ep_dev_groups[] = { &ep_dev_attr_grp, NULL }; diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index b5c72e45894..7ec3041ae79 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -573,7 +573,7 @@ static struct attribute_group dev_string_attr_grp = { .is_visible = dev_string_attrs_are_visible, }; -struct attribute_group *usb_device_groups[] = { +const struct attribute_group *usb_device_groups[] = { &dev_attr_grp, &dev_string_attr_grp, NULL @@ -799,7 +799,7 @@ static struct attribute_group intf_assoc_attr_grp = { .is_visible = intf_assoc_attrs_are_visible, }; -struct attribute_group *usb_interface_groups[] = { +const struct attribute_group *usb_interface_groups[] = { &intf_attr_grp, &intf_assoc_attr_grp, NULL diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index e2a8cfaade1..c0e0ae2bb8e 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -152,8 +152,8 @@ static inline int is_active(const struct usb_interface *f) extern const char *usbcore_name; /* sysfs stuff */ -extern struct attribute_group *usb_device_groups[]; -extern struct attribute_group *usb_interface_groups[]; +extern const struct attribute_group *usb_device_groups[]; +extern const struct attribute_group *usb_interface_groups[]; /* usbfs stuff */ extern struct mutex usbfs_mutex; diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index 274751b4409..5cd0e48f67f 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -67,7 +67,7 @@ MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications"); * debug = 0, no debugging messages * debug = 1, dump failed URBs except for stalls * debug = 2, dump all failed URBs (including stalls) - * show all queues in /debug/uhci/[pci_addr] + * show all queues in /sys/kernel/debug/uhci/[pci_addr] * debug = 3, show all TDs in URBs when dumping */ #ifdef DEBUG diff --git a/drivers/uwb/lc-dev.c b/drivers/uwb/lc-dev.c index e9fe1bb7eb2..1097e81b56d 100644 --- a/drivers/uwb/lc-dev.c +++ b/drivers/uwb/lc-dev.c @@ -255,7 +255,7 @@ static struct attribute_group dev_attr_group = { .attrs = dev_attrs, }; -static struct attribute_group *groups[] = { +static const struct attribute_group *groups[] = { &dev_attr_group, NULL, }; diff --git a/fs/partitions/check.c b/fs/partitions/check.c index 619ba99dfe3..fbeaddf595d 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -312,7 +312,7 @@ static struct attribute_group part_attr_group = { .attrs = part_attrs, }; -static struct attribute_group *part_attr_groups[] = { +static const struct attribute_group *part_attr_groups[] = { &part_attr_group, #ifdef CONFIG_BLK_DEV_IO_TRACE &blk_trace_attr_group, diff --git a/include/linux/attribute_container.h b/include/linux/attribute_container.h index 794ad74b1d6..c3ab81428c6 100644 --- a/include/linux/attribute_container.h +++ b/include/linux/attribute_container.h @@ -17,7 +17,7 @@ struct attribute_container { struct list_head node; struct klist containers; struct class *class; - struct attribute_group *grp; + const struct attribute_group *grp; struct device_attribute **attrs; int (*match)(struct attribute_container *, struct device *); #define ATTRIBUTE_CONTAINER_NO_CLASSDEVS 0x01 diff --git a/include/linux/device.h b/include/linux/device.h index a2864297505..847b763e40e 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -2,7 +2,8 @@ * device.h - generic, centralized driver model * * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> - * Copyright (c) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2008-2009 Novell Inc. * * This file is released under the GPLv2 * @@ -130,7 +131,7 @@ struct device_driver { void (*shutdown) (struct device *dev); int (*suspend) (struct device *dev, pm_message_t state); int (*resume) (struct device *dev); - struct attribute_group **groups; + const struct attribute_group **groups; const struct dev_pm_ops *pm; @@ -224,6 +225,14 @@ extern void class_unregister(struct class *class); __class_register(class, &__key); \ }) +struct class_compat; +struct class_compat *class_compat_register(const char *name); +void class_compat_unregister(struct class_compat *cls); +int class_compat_create_link(struct class_compat *cls, struct device *dev, + struct device *device_link); +void class_compat_remove_link(struct class_compat *cls, struct device *dev, + struct device *device_link); + extern void class_dev_iter_init(struct class_dev_iter *iter, struct class *class, struct device *start, @@ -287,7 +296,7 @@ extern void class_destroy(struct class *cls); */ struct device_type { const char *name; - struct attribute_group **groups; + const struct attribute_group **groups; int (*uevent)(struct device *dev, struct kobj_uevent_env *env); char *(*nodename)(struct device *dev); void (*release)(struct device *dev); @@ -381,7 +390,6 @@ struct device { struct bus_type *bus; /* type of bus device is on */ struct device_driver *driver; /* which driver has allocated this device */ - void *driver_data; /* data private to the driver */ void *platform_data; /* Platform specific data, device core doesn't touch it */ struct dev_pm_info power; @@ -412,7 +420,7 @@ struct device { struct klist_node knode_class; struct class *class; - struct attribute_group **groups; /* optional groups */ + const struct attribute_group **groups; /* optional groups */ void (*release)(struct device *dev); }; @@ -447,16 +455,6 @@ static inline void set_dev_node(struct device *dev, int node) } #endif -static inline void *dev_get_drvdata(const struct device *dev) -{ - return dev->driver_data; -} - -static inline void dev_set_drvdata(struct device *dev, void *data) -{ - dev->driver_data = data; -} - static inline unsigned int dev_get_uevent_suppress(const struct device *dev) { return dev->kobj.uevent_suppress; @@ -490,6 +488,8 @@ extern int device_rename(struct device *dev, char *new_name); extern int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order); extern const char *device_get_nodename(struct device *dev, const char **tmp); +extern void *dev_get_drvdata(const struct device *dev); +extern void dev_set_drvdata(struct device *dev, void *data); /* * Root device objects for grouping under /sys/devices @@ -502,6 +502,11 @@ static inline struct device *root_device_register(const char *name) } extern void root_device_unregister(struct device *root); +static inline void *dev_get_platdata(const struct device *dev) +{ + return dev->platform_data; +} + /* * Manual binding of a device to driver. See drivers/base/bus.c * for information on use. @@ -547,6 +552,16 @@ extern void put_device(struct device *dev); extern void wait_for_device_probe(void); +#ifdef CONFIG_DEVTMPFS +extern int devtmpfs_create_node(struct device *dev); +extern int devtmpfs_delete_node(struct device *dev); +extern int devtmpfs_mount(const char *mountpoint); +#else +static inline int devtmpfs_create_node(struct device *dev) { return 0; } +static inline int devtmpfs_delete_node(struct device *dev) { return 0; } +static inline int devtmpfs_mount(const char *mountpoint) { return 0; } +#endif + /* drivers/base/power/shutdown.c */ extern void device_shutdown(void); diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 65ee1929b2b..a9aa4b5917d 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -895,7 +895,7 @@ struct net_device /* class/net/name entry */ struct device dev; /* space for optional statistics and wireless sysfs groups */ - struct attribute_group *sysfs_groups[3]; + const struct attribute_group *sysfs_groups[3]; /* rtnetlink link ops */ const struct rtnl_link_ops *rtnl_link_ops; diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h index fcaee42c7ac..dd0bed4f1cf 100644 --- a/include/linux/pci_regs.h +++ b/include/linux/pci_regs.h @@ -42,6 +42,7 @@ #define PCI_COMMAND_INTX_DISABLE 0x400 /* INTx Emulation Disable */ #define PCI_STATUS 0x06 /* 16 bits */ +#define PCI_STATUS_INTERRUPT 0x08 /* Interrupt status */ #define PCI_STATUS_CAP_LIST 0x10 /* Support Capability List */ #define PCI_STATUS_66MHZ 0x20 /* Support 66 Mhz PCI 2.1 bus */ #define PCI_STATUS_UDF 0x40 /* Support User Definable Features [obsolete] */ diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index 6d3f2f449ea..deee7afd8d6 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -38,6 +38,9 @@ static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) return container_of(inode, struct shmem_inode_info, vfs_inode); } +extern int init_tmpfs(void); +extern int shmem_fill_super(struct super_block *sb, void *data, int silent); + #ifdef CONFIG_TMPFS_POSIX_ACL int shmem_check_acl(struct inode *, int); int shmem_acl_init(struct inode *, struct inode *); diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h index eaec1ea9558..9ae8da3e640 100644 --- a/include/linux/transport_class.h +++ b/include/linux/transport_class.h @@ -55,7 +55,7 @@ struct anon_transport_class cls = { \ struct transport_container { struct attribute_container ac; - struct attribute_group *statistics; + const struct attribute_group *statistics; }; #define attribute_container_to_transport_container(x) \ diff --git a/init/do_mounts.c b/init/do_mounts.c index 093f6591550..bb008d064c1 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -415,7 +415,7 @@ void __init prepare_namespace(void) mount_root(); out: + devtmpfs_mount("dev"); sys_mount(".", "/", NULL, MS_MOVE, NULL); sys_chroot("."); } - diff --git a/init/main.c b/init/main.c index 63904bb6ae3..34971becbd3 100644 --- a/init/main.c +++ b/init/main.c @@ -68,6 +68,7 @@ #include <linux/async.h> #include <linux/kmemcheck.h> #include <linux/kmemtrace.h> +#include <linux/shmem_fs.h> #include <trace/boot.h> #include <asm/io.h> @@ -785,6 +786,7 @@ static void __init do_basic_setup(void) init_workqueues(); cpuset_init_smp(); usermodehelper_init(); + init_tmpfs(); driver_init(); init_irq_proc(); do_ctors(); diff --git a/kernel/Makefile b/kernel/Makefile index 961379caf66..3d9c7e27e3f 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -90,7 +90,6 @@ obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o obj-$(CONFIG_MARKERS) += marker.o obj-$(CONFIG_TRACEPOINTS) += tracepoint.o obj-$(CONFIG_LATENCYTOP) += latencytop.o -obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o obj-$(CONFIG_FUNCTION_TRACER) += trace/ obj-$(CONFIG_TRACING) += trace/ obj-$(CONFIG_X86_DS) += trace/ diff --git a/mm/shmem.c b/mm/shmem.c index 5a0b3d4055f..bd20f8bb02a 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2298,8 +2298,7 @@ static void shmem_put_super(struct super_block *sb) sb->s_fs_info = NULL; } -static int shmem_fill_super(struct super_block *sb, - void *data, int silent) +int shmem_fill_super(struct super_block *sb, void *data, int silent) { struct inode *inode; struct dentry *root; @@ -2519,7 +2518,7 @@ static struct file_system_type tmpfs_fs_type = { .kill_sb = kill_litter_super, }; -static int __init init_tmpfs(void) +int __init init_tmpfs(void) { int error; @@ -2576,7 +2575,7 @@ static struct file_system_type tmpfs_fs_type = { .kill_sb = kill_litter_super, }; -static int __init init_tmpfs(void) +int __init init_tmpfs(void) { BUG_ON(register_filesystem(&tmpfs_fs_type) != 0); @@ -2687,5 +2686,3 @@ int shmem_zero_setup(struct vm_area_struct *vma) vma->vm_ops = &shmem_vm_ops; return 0; } - -module_init(init_tmpfs) diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c index 95f7a7a544b..7f939ce2980 100644 --- a/net/bluetooth/hci_sysfs.c +++ b/net/bluetooth/hci_sysfs.c @@ -68,7 +68,7 @@ static struct attribute_group bt_link_group = { .attrs = bt_link_attrs, }; -static struct attribute_group *bt_link_groups[] = { +static const struct attribute_group *bt_link_groups[] = { &bt_link_group, NULL }; @@ -392,7 +392,7 @@ static struct attribute_group bt_host_group = { .attrs = bt_host_attrs, }; -static struct attribute_group *bt_host_groups[] = { +static const struct attribute_group *bt_host_groups[] = { &bt_host_group, NULL }; diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index ad91e9e5f47..7d4c57523b0 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -493,7 +493,7 @@ void netdev_unregister_kobject(struct net_device * net) int netdev_register_kobject(struct net_device *net) { struct device *dev = &(net->dev); - struct attribute_group **groups = net->sysfs_groups; + const struct attribute_group **groups = net->sysfs_groups; dev->class = &net_class; dev->platform_data = net; diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h index f24ae370e51..6af373236d7 100644 --- a/samples/trace_events/trace-events-sample.h +++ b/samples/trace_events/trace-events-sample.h @@ -1,6 +1,6 @@ /* * If TRACE_SYSTEM is defined, that will be the directory created - * in the ftrace directory under /debugfs/tracing/events/<system> + * in the ftrace directory under /sys/kernel/debug/tracing/events/<system> * * The define_trace.h below will also look for a file name of * TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here. |