Driver core patches for 4.6-rc1
Just a few patches this time around for the 4.6-rc1 merge window. Largest is a new firmware driver, but there are some other updates to the driver core in here as well, the shortlog has the details. All have been in linux-next for a while with no reported issues. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlbp9QoACgkQMUfUDdst+ynsOQCghpfAf3CJDr4PWGCKzDJzyQG9 rZYAn2VwKsqHzAxgLXZY5fQIjxSyaLek =Mcvl -----END PGP SIGNATURE----- Merge tag 'driver-core-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core updates from Greg KH: "Just a few patches this time around for the 4.6-rc1 merge window. Largest is a new firmware driver, but there are some other updates to the driver core in here as well, the shortlog has the details. All have been in linux-next for a while with no reported issues" * tag 'driver-core-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: Revert "driver-core: platform: probe of-devices only using list of compatibles" firmware: qemu config needs I/O ports firmware: qemu_fw_cfg.c: fix typo FW_CFG_DATA_OFF driver-core: platform: probe of-devices only using list of compatibles driver-core: platform: fix typo in documentation for multi-driver helper component: remove impossible condition drivers: dma-coherent: simplify dma_init_coherent_memory return value devicetree: update documentation for fw_cfg ARM bindings firmware: create directory hierarchy for sysfs fw_cfg entries firmware: introduce sysfs driver for QEMU's fw_cfg device kobject: export kset_find_obj() for module use driver core: bus: use to_subsys_private and to_device_private_bus driver core: bus: use list_for_each_entry* debugfs: Add stub function for debugfs_create_automount(). kernfs: make kernfs_walk_ns() use kernfs_pr_cont_buf[]hifive-unleashed-5.1
Linus Torvalds
commit
1a4ab084af
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@ -0,0 +1,100 @@
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What: /sys/firmware/qemu_fw_cfg/
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Date: August 2015
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Contact: Gabriel Somlo <somlo@cmu.edu>
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Description:
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Several different architectures supported by QEMU (x86, arm,
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sun4*, ppc/mac) are provisioned with a firmware configuration
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(fw_cfg) device, originally intended as a way for the host to
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provide configuration data to the guest firmware. Starting
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with QEMU v2.4, arbitrary fw_cfg file entries may be specified
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by the user on the command line, which makes fw_cfg additionally
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useful as an out-of-band, asynchronous mechanism for providing
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configuration data to the guest userspace.
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The authoritative guest-side hardware interface documentation
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to the fw_cfg device can be found in "docs/specs/fw_cfg.txt"
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in the QEMU source tree.
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=== SysFS fw_cfg Interface ===
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The fw_cfg sysfs interface described in this document is only
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intended to display discoverable blobs (i.e., those registered
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with the file directory), as there is no way to determine the
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presence or size of "legacy" blobs (with selector keys between
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0x0002 and 0x0018) programmatically.
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All fw_cfg information is shown under:
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/sys/firmware/qemu_fw_cfg/
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The only legacy blob displayed is the fw_cfg device revision:
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/sys/firmware/qemu_fw_cfg/rev
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--- Discoverable fw_cfg blobs by selector key ---
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All discoverable blobs listed in the fw_cfg file directory are
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displayed as entries named after their unique selector key
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value, e.g.:
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/sys/firmware/qemu_fw_cfg/by_key/32
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/sys/firmware/qemu_fw_cfg/by_key/33
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/sys/firmware/qemu_fw_cfg/by_key/34
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...
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Each such fw_cfg sysfs entry has the following values exported
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as attributes:
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name : The 56-byte nul-terminated ASCII string used as the
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blob's 'file name' in the fw_cfg directory.
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size : The length of the blob, as given in the fw_cfg
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directory.
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key : The value of the blob's selector key as given in the
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fw_cfg directory. This value is the same as used in
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the parent directory name.
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raw : The raw bytes of the blob, obtained by selecting the
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entry via the control register, and reading a number
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of bytes equal to the blob size from the data
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register.
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--- Listing fw_cfg blobs by file name ---
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While the fw_cfg device does not impose any specific naming
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convention on the blobs registered in the file directory,
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QEMU developers have traditionally used path name semantics
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to give each blob a descriptive name. For example:
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"bootorder"
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"genroms/kvmvapic.bin"
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"etc/e820"
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"etc/boot-fail-wait"
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"etc/system-states"
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"etc/table-loader"
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"etc/acpi/rsdp"
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"etc/acpi/tables"
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"etc/smbios/smbios-tables"
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"etc/smbios/smbios-anchor"
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...
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In addition to the listing by unique selector key described
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above, the fw_cfg sysfs driver also attempts to build a tree
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of directories matching the path name components of fw_cfg
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blob names, ending in symlinks to the by_key entry for each
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"basename", as illustrated below (assume current directory is
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/sys/firmware):
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qemu_fw_cfg/by_name/bootorder -> ../by_key/38
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qemu_fw_cfg/by_name/etc/e820 -> ../../by_key/35
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qemu_fw_cfg/by_name/etc/acpi/rsdp -> ../../../by_key/41
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...
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Construction of the directory tree and symlinks is done on a
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"best-effort" basis, as there is no guarantee that components
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of fw_cfg blob names are always "well behaved". I.e., there is
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the possibility that a symlink (basename) will conflict with
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a dirname component of another fw_cfg blob, in which case the
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creation of the offending /sys/firmware/qemu_fw_cfg/by_name
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entry will be skipped.
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The authoritative list of entries will continue to be found
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under the /sys/firmware/qemu_fw_cfg/by_key directory.
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@ -11,43 +11,9 @@ QEMU exposes the control and data register to ARM guests as memory mapped
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registers; their location is communicated to the guest's UEFI firmware in the
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DTB that QEMU places at the bottom of the guest's DRAM.
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The guest writes a selector value (a key) to the selector register, and then
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can read the corresponding data (produced by QEMU) via the data register. If
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the selected entry is writable, the guest can rewrite it through the data
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register.
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The authoritative guest-side hardware interface documentation to the fw_cfg
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device can be found in "docs/specs/fw_cfg.txt" in the QEMU source tree.
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The selector register takes keys in big endian byte order.
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The data register allows accesses with 8, 16, 32 and 64-bit width (only at
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offset 0 of the register). Accesses larger than a byte are interpreted as
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arrays, bundled together only for better performance. The bytes constituting
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such a word, in increasing address order, correspond to the bytes that would
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have been transferred by byte-wide accesses in chronological order.
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The interface allows guest firmware to download various parameters and blobs
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that affect how the firmware works and what tables it installs for the guest
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OS. For example, boot order of devices, ACPI tables, SMBIOS tables, kernel and
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initrd images for direct kernel booting, virtual machine UUID, SMP information,
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virtual NUMA topology, and so on.
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The authoritative registry of the valid selector values and their meanings is
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the QEMU source code; the structure of the data blobs corresponding to the
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individual key values is also defined in the QEMU source code.
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The presence of the registers can be verified by selecting the "signature" blob
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with key 0x0000, and reading four bytes from the data register. The returned
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signature is "QEMU".
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The outermost protocol (involving the write / read sequences of the control and
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data registers) is expected to be versioned, and/or described by feature bits.
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The interface revision / feature bitmap can be retrieved with key 0x0001. The
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blob to be read from the data register has size 4, and it is to be interpreted
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as a uint32_t value in little endian byte order. The current value
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(corresponding to the above outer protocol) is zero.
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The guest kernel is not expected to use these registers (although it is
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certainly allowed to); the device tree bindings are documented here because
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this is where device tree bindings reside in general.
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Required properties:
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@ -75,7 +75,7 @@ If one of the drivers fails to register, all drivers registered up to that
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point will be unregistered in reverse order. Note that there is a convenience
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macro that passes THIS_MODULE as owner parameter:
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#define platform_register_driver(drivers, count)
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#define platform_register_drivers(drivers, count)
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Device Enumeration
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@ -149,8 +149,7 @@ EXPORT_SYMBOL_GPL(bus_remove_file);
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static void bus_release(struct kobject *kobj)
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{
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struct subsys_private *priv =
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container_of(kobj, typeof(*priv), subsys.kobj);
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struct subsys_private *priv = to_subsys_private(kobj);
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struct bus_type *bus = priv->bus;
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kfree(priv);
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@ -1019,13 +1018,11 @@ static void device_insertion_sort_klist(struct device *a, struct list_head *list
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int (*compare)(const struct device *a,
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const struct device *b))
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{
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struct list_head *pos;
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struct klist_node *n;
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struct device_private *dev_prv;
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struct device *b;
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list_for_each(pos, list) {
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n = container_of(pos, struct klist_node, n_node);
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list_for_each_entry(n, list, n_node) {
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dev_prv = to_device_private_bus(n);
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b = dev_prv->device;
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if (compare(a, b) <= 0) {
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@ -1042,8 +1039,7 @@ void bus_sort_breadthfirst(struct bus_type *bus,
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const struct device *b))
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{
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LIST_HEAD(sorted_devices);
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struct list_head *pos, *tmp;
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struct klist_node *n;
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struct klist_node *n, *tmp;
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struct device_private *dev_prv;
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struct device *dev;
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struct klist *device_klist;
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@ -1051,8 +1047,7 @@ void bus_sort_breadthfirst(struct bus_type *bus,
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device_klist = bus_get_device_klist(bus);
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spin_lock(&device_klist->k_lock);
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list_for_each_safe(pos, tmp, &device_klist->k_list) {
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n = container_of(pos, struct klist_node, n_node);
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list_for_each_entry_safe(n, tmp, &device_klist->k_list, n_node) {
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dev_prv = to_device_private_bus(n);
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dev = dev_prv->device;
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device_insertion_sort_klist(dev, &sorted_devices, compare);
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@ -1107,7 +1102,7 @@ struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter)
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knode = klist_next(&iter->ki);
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if (!knode)
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return NULL;
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dev = container_of(knode, struct device_private, knode_bus)->device;
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dev = to_device_private_bus(knode)->device;
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if (!iter->type || iter->type == dev->type)
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return dev;
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}
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@ -267,7 +267,7 @@ void component_match_add_release(struct device *master,
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}
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if (match->num == match->alloc) {
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size_t new_size = match ? match->alloc + 16 : 15;
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size_t new_size = match->alloc + 16;
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int ret;
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ret = component_match_realloc(master, match, new_size);
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@ -17,9 +17,9 @@ struct dma_coherent_mem {
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spinlock_t spinlock;
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};
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static int dma_init_coherent_memory(phys_addr_t phys_addr, dma_addr_t device_addr,
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size_t size, int flags,
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struct dma_coherent_mem **mem)
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static bool dma_init_coherent_memory(
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phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,
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struct dma_coherent_mem **mem)
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{
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struct dma_coherent_mem *dma_mem = NULL;
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void __iomem *mem_base = NULL;
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@ -50,17 +50,13 @@ static int dma_init_coherent_memory(phys_addr_t phys_addr, dma_addr_t device_add
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spin_lock_init(&dma_mem->spinlock);
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*mem = dma_mem;
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if (flags & DMA_MEMORY_MAP)
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return DMA_MEMORY_MAP;
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return DMA_MEMORY_IO;
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return true;
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out:
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kfree(dma_mem);
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if (mem_base)
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iounmap(mem_base);
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return 0;
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return false;
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}
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static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
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@ -88,15 +84,13 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
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dma_addr_t device_addr, size_t size, int flags)
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{
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struct dma_coherent_mem *mem;
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int ret;
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ret = dma_init_coherent_memory(phys_addr, device_addr, size, flags,
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&mem);
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if (ret == 0)
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if (!dma_init_coherent_memory(phys_addr, device_addr, size, flags,
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&mem))
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return 0;
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if (dma_assign_coherent_memory(dev, mem) == 0)
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return ret;
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return flags & DMA_MEMORY_MAP ? DMA_MEMORY_MAP : DMA_MEMORY_IO;
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dma_release_coherent_memory(mem);
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return 0;
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@ -281,9 +275,9 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
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struct dma_coherent_mem *mem = rmem->priv;
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if (!mem &&
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dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
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DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
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&mem) != DMA_MEMORY_MAP) {
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!dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
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DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
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&mem)) {
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pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
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&rmem->base, (unsigned long)rmem->size / SZ_1M);
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return -ENODEV;
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|
|
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|
|
@ -161,6 +161,26 @@ config RASPBERRYPI_FIRMWARE
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|||
This option enables support for communicating with the firmware on the
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Raspberry Pi.
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||||
|
||||
config FW_CFG_SYSFS
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tristate "QEMU fw_cfg device support in sysfs"
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depends on SYSFS && (ARM || ARM64 || PPC_PMAC || SPARC || X86)
|
||||
depends on HAS_IOPORT_MAP
|
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default n
|
||||
help
|
||||
Say Y or M here to enable the exporting of the QEMU firmware
|
||||
configuration (fw_cfg) file entries via sysfs. Entries are
|
||||
found under /sys/firmware/fw_cfg when this option is enabled
|
||||
and loaded.
|
||||
|
||||
config FW_CFG_SYSFS_CMDLINE
|
||||
bool "QEMU fw_cfg device parameter parsing"
|
||||
depends on FW_CFG_SYSFS
|
||||
help
|
||||
Allow the qemu_fw_cfg device to be initialized via the kernel
|
||||
command line or using a module parameter.
|
||||
WARNING: Using incorrect parameters (base address in particular)
|
||||
may crash your system.
|
||||
|
||||
config QCOM_SCM
|
||||
bool
|
||||
depends on ARM || ARM64
|
||||
|
|
|
|||
|
|
@ -14,6 +14,7 @@ obj-$(CONFIG_ISCSI_IBFT_FIND) += iscsi_ibft_find.o
|
|||
obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
|
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obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
|
||||
obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o
|
||||
obj-$(CONFIG_FW_CFG_SYSFS) += qemu_fw_cfg.o
|
||||
obj-$(CONFIG_QCOM_SCM) += qcom_scm.o
|
||||
obj-$(CONFIG_QCOM_SCM_64) += qcom_scm-64.o
|
||||
obj-$(CONFIG_QCOM_SCM_32) += qcom_scm-32.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,751 @@
|
|||
/*
|
||||
* drivers/firmware/qemu_fw_cfg.c
|
||||
*
|
||||
* Copyright 2015 Carnegie Mellon University
|
||||
*
|
||||
* Expose entries from QEMU's firmware configuration (fw_cfg) device in
|
||||
* sysfs (read-only, under "/sys/firmware/qemu_fw_cfg/...").
|
||||
*
|
||||
* The fw_cfg device may be instantiated via either an ACPI node (on x86
|
||||
* and select subsets of aarch64), a Device Tree node (on arm), or using
|
||||
* a kernel module (or command line) parameter with the following syntax:
|
||||
*
|
||||
* [fw_cfg.]ioport=<size>@<base>[:<ctrl_off>:<data_off>]
|
||||
* or
|
||||
* [fw_cfg.]mmio=<size>@<base>[:<ctrl_off>:<data_off>]
|
||||
*
|
||||
* where:
|
||||
* <size> := size of ioport or mmio range
|
||||
* <base> := physical base address of ioport or mmio range
|
||||
* <ctrl_off> := (optional) offset of control register
|
||||
* <data_off> := (optional) offset of data register
|
||||
*
|
||||
* e.g.:
|
||||
* fw_cfg.ioport=2@0x510:0:1 (the default on x86)
|
||||
* or
|
||||
* fw_cfg.mmio=0xA@0x9020000:8:0 (the default on arm)
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/acpi.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/ioport.h>
|
||||
|
||||
MODULE_AUTHOR("Gabriel L. Somlo <somlo@cmu.edu>");
|
||||
MODULE_DESCRIPTION("QEMU fw_cfg sysfs support");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
/* selector key values for "well-known" fw_cfg entries */
|
||||
#define FW_CFG_SIGNATURE 0x00
|
||||
#define FW_CFG_ID 0x01
|
||||
#define FW_CFG_FILE_DIR 0x19
|
||||
|
||||
/* size in bytes of fw_cfg signature */
|
||||
#define FW_CFG_SIG_SIZE 4
|
||||
|
||||
/* fw_cfg "file name" is up to 56 characters (including terminating nul) */
|
||||
#define FW_CFG_MAX_FILE_PATH 56
|
||||
|
||||
/* fw_cfg file directory entry type */
|
||||
struct fw_cfg_file {
|
||||
u32 size;
|
||||
u16 select;
|
||||
u16 reserved;
|
||||
char name[FW_CFG_MAX_FILE_PATH];
|
||||
};
|
||||
|
||||
/* fw_cfg device i/o register addresses */
|
||||
static bool fw_cfg_is_mmio;
|
||||
static phys_addr_t fw_cfg_p_base;
|
||||
static resource_size_t fw_cfg_p_size;
|
||||
static void __iomem *fw_cfg_dev_base;
|
||||
static void __iomem *fw_cfg_reg_ctrl;
|
||||
static void __iomem *fw_cfg_reg_data;
|
||||
|
||||
/* atomic access to fw_cfg device (potentially slow i/o, so using mutex) */
|
||||
static DEFINE_MUTEX(fw_cfg_dev_lock);
|
||||
|
||||
/* pick appropriate endianness for selector key */
|
||||
static inline u16 fw_cfg_sel_endianness(u16 key)
|
||||
{
|
||||
return fw_cfg_is_mmio ? cpu_to_be16(key) : cpu_to_le16(key);
|
||||
}
|
||||
|
||||
/* read chunk of given fw_cfg blob (caller responsible for sanity-check) */
|
||||
static inline void fw_cfg_read_blob(u16 key,
|
||||
void *buf, loff_t pos, size_t count)
|
||||
{
|
||||
mutex_lock(&fw_cfg_dev_lock);
|
||||
iowrite16(fw_cfg_sel_endianness(key), fw_cfg_reg_ctrl);
|
||||
while (pos-- > 0)
|
||||
ioread8(fw_cfg_reg_data);
|
||||
ioread8_rep(fw_cfg_reg_data, buf, count);
|
||||
mutex_unlock(&fw_cfg_dev_lock);
|
||||
}
|
||||
|
||||
/* clean up fw_cfg device i/o */
|
||||
static void fw_cfg_io_cleanup(void)
|
||||
{
|
||||
if (fw_cfg_is_mmio) {
|
||||
iounmap(fw_cfg_dev_base);
|
||||
release_mem_region(fw_cfg_p_base, fw_cfg_p_size);
|
||||
} else {
|
||||
ioport_unmap(fw_cfg_dev_base);
|
||||
release_region(fw_cfg_p_base, fw_cfg_p_size);
|
||||
}
|
||||
}
|
||||
|
||||
/* arch-specific ctrl & data register offsets are not available in ACPI, DT */
|
||||
#if !(defined(FW_CFG_CTRL_OFF) && defined(FW_CFG_DATA_OFF))
|
||||
# if (defined(CONFIG_ARM) || defined(CONFIG_ARM64))
|
||||
# define FW_CFG_CTRL_OFF 0x08
|
||||
# define FW_CFG_DATA_OFF 0x00
|
||||
# elif (defined(CONFIG_PPC_PMAC) || defined(CONFIG_SPARC32)) /* ppc/mac,sun4m */
|
||||
# define FW_CFG_CTRL_OFF 0x00
|
||||
# define FW_CFG_DATA_OFF 0x02
|
||||
# elif (defined(CONFIG_X86) || defined(CONFIG_SPARC64)) /* x86, sun4u */
|
||||
# define FW_CFG_CTRL_OFF 0x00
|
||||
# define FW_CFG_DATA_OFF 0x01
|
||||
# else
|
||||
# warning "QEMU FW_CFG may not be available on this architecture!"
|
||||
# define FW_CFG_CTRL_OFF 0x00
|
||||
# define FW_CFG_DATA_OFF 0x01
|
||||
# endif
|
||||
#endif
|
||||
|
||||
/* initialize fw_cfg device i/o from platform data */
|
||||
static int fw_cfg_do_platform_probe(struct platform_device *pdev)
|
||||
{
|
||||
char sig[FW_CFG_SIG_SIZE];
|
||||
struct resource *range, *ctrl, *data;
|
||||
|
||||
/* acquire i/o range details */
|
||||
fw_cfg_is_mmio = false;
|
||||
range = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
||||
if (!range) {
|
||||
fw_cfg_is_mmio = true;
|
||||
range = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!range)
|
||||
return -EINVAL;
|
||||
}
|
||||
fw_cfg_p_base = range->start;
|
||||
fw_cfg_p_size = resource_size(range);
|
||||
|
||||
if (fw_cfg_is_mmio) {
|
||||
if (!request_mem_region(fw_cfg_p_base,
|
||||
fw_cfg_p_size, "fw_cfg_mem"))
|
||||
return -EBUSY;
|
||||
fw_cfg_dev_base = ioremap(fw_cfg_p_base, fw_cfg_p_size);
|
||||
if (!fw_cfg_dev_base) {
|
||||
release_mem_region(fw_cfg_p_base, fw_cfg_p_size);
|
||||
return -EFAULT;
|
||||
}
|
||||
} else {
|
||||
if (!request_region(fw_cfg_p_base,
|
||||
fw_cfg_p_size, "fw_cfg_io"))
|
||||
return -EBUSY;
|
||||
fw_cfg_dev_base = ioport_map(fw_cfg_p_base, fw_cfg_p_size);
|
||||
if (!fw_cfg_dev_base) {
|
||||
release_region(fw_cfg_p_base, fw_cfg_p_size);
|
||||
return -EFAULT;
|
||||
}
|
||||
}
|
||||
|
||||
/* were custom register offsets provided (e.g. on the command line)? */
|
||||
ctrl = platform_get_resource_byname(pdev, IORESOURCE_REG, "ctrl");
|
||||
data = platform_get_resource_byname(pdev, IORESOURCE_REG, "data");
|
||||
if (ctrl && data) {
|
||||
fw_cfg_reg_ctrl = fw_cfg_dev_base + ctrl->start;
|
||||
fw_cfg_reg_data = fw_cfg_dev_base + data->start;
|
||||
} else {
|
||||
/* use architecture-specific offsets */
|
||||
fw_cfg_reg_ctrl = fw_cfg_dev_base + FW_CFG_CTRL_OFF;
|
||||
fw_cfg_reg_data = fw_cfg_dev_base + FW_CFG_DATA_OFF;
|
||||
}
|
||||
|
||||
/* verify fw_cfg device signature */
|
||||
fw_cfg_read_blob(FW_CFG_SIGNATURE, sig, 0, FW_CFG_SIG_SIZE);
|
||||
if (memcmp(sig, "QEMU", FW_CFG_SIG_SIZE) != 0) {
|
||||
fw_cfg_io_cleanup();
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* fw_cfg revision attribute, in /sys/firmware/qemu_fw_cfg top-level dir. */
|
||||
static u32 fw_cfg_rev;
|
||||
|
||||
static ssize_t fw_cfg_showrev(struct kobject *k, struct attribute *a, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%u\n", fw_cfg_rev);
|
||||
}
|
||||
|
||||
static const struct {
|
||||
struct attribute attr;
|
||||
ssize_t (*show)(struct kobject *k, struct attribute *a, char *buf);
|
||||
} fw_cfg_rev_attr = {
|
||||
.attr = { .name = "rev", .mode = S_IRUSR },
|
||||
.show = fw_cfg_showrev,
|
||||
};
|
||||
|
||||
/* fw_cfg_sysfs_entry type */
|
||||
struct fw_cfg_sysfs_entry {
|
||||
struct kobject kobj;
|
||||
struct fw_cfg_file f;
|
||||
struct list_head list;
|
||||
};
|
||||
|
||||
/* get fw_cfg_sysfs_entry from kobject member */
|
||||
static inline struct fw_cfg_sysfs_entry *to_entry(struct kobject *kobj)
|
||||
{
|
||||
return container_of(kobj, struct fw_cfg_sysfs_entry, kobj);
|
||||
}
|
||||
|
||||
/* fw_cfg_sysfs_attribute type */
|
||||
struct fw_cfg_sysfs_attribute {
|
||||
struct attribute attr;
|
||||
ssize_t (*show)(struct fw_cfg_sysfs_entry *entry, char *buf);
|
||||
};
|
||||
|
||||
/* get fw_cfg_sysfs_attribute from attribute member */
|
||||
static inline struct fw_cfg_sysfs_attribute *to_attr(struct attribute *attr)
|
||||
{
|
||||
return container_of(attr, struct fw_cfg_sysfs_attribute, attr);
|
||||
}
|
||||
|
||||
/* global cache of fw_cfg_sysfs_entry objects */
|
||||
static LIST_HEAD(fw_cfg_entry_cache);
|
||||
|
||||
/* kobjects removed lazily by kernel, mutual exclusion needed */
|
||||
static DEFINE_SPINLOCK(fw_cfg_cache_lock);
|
||||
|
||||
static inline void fw_cfg_sysfs_cache_enlist(struct fw_cfg_sysfs_entry *entry)
|
||||
{
|
||||
spin_lock(&fw_cfg_cache_lock);
|
||||
list_add_tail(&entry->list, &fw_cfg_entry_cache);
|
||||
spin_unlock(&fw_cfg_cache_lock);
|
||||
}
|
||||
|
||||
static inline void fw_cfg_sysfs_cache_delist(struct fw_cfg_sysfs_entry *entry)
|
||||
{
|
||||
spin_lock(&fw_cfg_cache_lock);
|
||||
list_del(&entry->list);
|
||||
spin_unlock(&fw_cfg_cache_lock);
|
||||
}
|
||||
|
||||
static void fw_cfg_sysfs_cache_cleanup(void)
|
||||
{
|
||||
struct fw_cfg_sysfs_entry *entry, *next;
|
||||
|
||||
list_for_each_entry_safe(entry, next, &fw_cfg_entry_cache, list) {
|
||||
/* will end up invoking fw_cfg_sysfs_cache_delist()
|
||||
* via each object's release() method (i.e. destructor)
|
||||
*/
|
||||
kobject_put(&entry->kobj);
|
||||
}
|
||||
}
|
||||
|
||||
/* default_attrs: per-entry attributes and show methods */
|
||||
|
||||
#define FW_CFG_SYSFS_ATTR(_attr) \
|
||||
struct fw_cfg_sysfs_attribute fw_cfg_sysfs_attr_##_attr = { \
|
||||
.attr = { .name = __stringify(_attr), .mode = S_IRUSR }, \
|
||||
.show = fw_cfg_sysfs_show_##_attr, \
|
||||
}
|
||||
|
||||
static ssize_t fw_cfg_sysfs_show_size(struct fw_cfg_sysfs_entry *e, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%u\n", e->f.size);
|
||||
}
|
||||
|
||||
static ssize_t fw_cfg_sysfs_show_key(struct fw_cfg_sysfs_entry *e, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%u\n", e->f.select);
|
||||
}
|
||||
|
||||
static ssize_t fw_cfg_sysfs_show_name(struct fw_cfg_sysfs_entry *e, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%s\n", e->f.name);
|
||||
}
|
||||
|
||||
static FW_CFG_SYSFS_ATTR(size);
|
||||
static FW_CFG_SYSFS_ATTR(key);
|
||||
static FW_CFG_SYSFS_ATTR(name);
|
||||
|
||||
static struct attribute *fw_cfg_sysfs_entry_attrs[] = {
|
||||
&fw_cfg_sysfs_attr_size.attr,
|
||||
&fw_cfg_sysfs_attr_key.attr,
|
||||
&fw_cfg_sysfs_attr_name.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
/* sysfs_ops: find fw_cfg_[entry, attribute] and call appropriate show method */
|
||||
static ssize_t fw_cfg_sysfs_attr_show(struct kobject *kobj, struct attribute *a,
|
||||
char *buf)
|
||||
{
|
||||
struct fw_cfg_sysfs_entry *entry = to_entry(kobj);
|
||||
struct fw_cfg_sysfs_attribute *attr = to_attr(a);
|
||||
|
||||
return attr->show(entry, buf);
|
||||
}
|
||||
|
||||
static const struct sysfs_ops fw_cfg_sysfs_attr_ops = {
|
||||
.show = fw_cfg_sysfs_attr_show,
|
||||
};
|
||||
|
||||
/* release: destructor, to be called via kobject_put() */
|
||||
static void fw_cfg_sysfs_release_entry(struct kobject *kobj)
|
||||
{
|
||||
struct fw_cfg_sysfs_entry *entry = to_entry(kobj);
|
||||
|
||||
fw_cfg_sysfs_cache_delist(entry);
|
||||
kfree(entry);
|
||||
}
|
||||
|
||||
/* kobj_type: ties together all properties required to register an entry */
|
||||
static struct kobj_type fw_cfg_sysfs_entry_ktype = {
|
||||
.default_attrs = fw_cfg_sysfs_entry_attrs,
|
||||
.sysfs_ops = &fw_cfg_sysfs_attr_ops,
|
||||
.release = fw_cfg_sysfs_release_entry,
|
||||
};
|
||||
|
||||
/* raw-read method and attribute */
|
||||
static ssize_t fw_cfg_sysfs_read_raw(struct file *filp, struct kobject *kobj,
|
||||
struct bin_attribute *bin_attr,
|
||||
char *buf, loff_t pos, size_t count)
|
||||
{
|
||||
struct fw_cfg_sysfs_entry *entry = to_entry(kobj);
|
||||
|
||||
if (pos > entry->f.size)
|
||||
return -EINVAL;
|
||||
|
||||
if (count > entry->f.size - pos)
|
||||
count = entry->f.size - pos;
|
||||
|
||||
fw_cfg_read_blob(entry->f.select, buf, pos, count);
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct bin_attribute fw_cfg_sysfs_attr_raw = {
|
||||
.attr = { .name = "raw", .mode = S_IRUSR },
|
||||
.read = fw_cfg_sysfs_read_raw,
|
||||
};
|
||||
|
||||
/*
|
||||
* Create a kset subdirectory matching each '/' delimited dirname token
|
||||
* in 'name', starting with sysfs kset/folder 'dir'; At the end, create
|
||||
* a symlink directed at the given 'target'.
|
||||
* NOTE: We do this on a best-effort basis, since 'name' is not guaranteed
|
||||
* to be a well-behaved path name. Whenever a symlink vs. kset directory
|
||||
* name collision occurs, the kernel will issue big scary warnings while
|
||||
* refusing to add the offending link or directory. We follow up with our
|
||||
* own, slightly less scary error messages explaining the situation :)
|
||||
*/
|
||||
static int fw_cfg_build_symlink(struct kset *dir,
|
||||
struct kobject *target, const char *name)
|
||||
{
|
||||
int ret;
|
||||
struct kset *subdir;
|
||||
struct kobject *ko;
|
||||
char *name_copy, *p, *tok;
|
||||
|
||||
if (!dir || !target || !name || !*name)
|
||||
return -EINVAL;
|
||||
|
||||
/* clone a copy of name for parsing */
|
||||
name_copy = p = kstrdup(name, GFP_KERNEL);
|
||||
if (!name_copy)
|
||||
return -ENOMEM;
|
||||
|
||||
/* create folders for each dirname token, then symlink for basename */
|
||||
while ((tok = strsep(&p, "/")) && *tok) {
|
||||
|
||||
/* last (basename) token? If so, add symlink here */
|
||||
if (!p || !*p) {
|
||||
ret = sysfs_create_link(&dir->kobj, target, tok);
|
||||
break;
|
||||
}
|
||||
|
||||
/* does the current dir contain an item named after tok ? */
|
||||
ko = kset_find_obj(dir, tok);
|
||||
if (ko) {
|
||||
/* drop reference added by kset_find_obj */
|
||||
kobject_put(ko);
|
||||
|
||||
/* ko MUST be a kset - we're about to use it as one ! */
|
||||
if (ko->ktype != dir->kobj.ktype) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
/* descend into already existing subdirectory */
|
||||
dir = to_kset(ko);
|
||||
} else {
|
||||
/* create new subdirectory kset */
|
||||
subdir = kzalloc(sizeof(struct kset), GFP_KERNEL);
|
||||
if (!subdir) {
|
||||
ret = -ENOMEM;
|
||||
break;
|
||||
}
|
||||
subdir->kobj.kset = dir;
|
||||
subdir->kobj.ktype = dir->kobj.ktype;
|
||||
ret = kobject_set_name(&subdir->kobj, "%s", tok);
|
||||
if (ret) {
|
||||
kfree(subdir);
|
||||
break;
|
||||
}
|
||||
ret = kset_register(subdir);
|
||||
if (ret) {
|
||||
kfree(subdir);
|
||||
break;
|
||||
}
|
||||
|
||||
/* descend into newly created subdirectory */
|
||||
dir = subdir;
|
||||
}
|
||||
}
|
||||
|
||||
/* we're done with cloned copy of name */
|
||||
kfree(name_copy);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* recursively unregister fw_cfg/by_name/ kset directory tree */
|
||||
static void fw_cfg_kset_unregister_recursive(struct kset *kset)
|
||||
{
|
||||
struct kobject *k, *next;
|
||||
|
||||
list_for_each_entry_safe(k, next, &kset->list, entry)
|
||||
/* all set members are ksets too, but check just in case... */
|
||||
if (k->ktype == kset->kobj.ktype)
|
||||
fw_cfg_kset_unregister_recursive(to_kset(k));
|
||||
|
||||
/* symlinks are cleanly and automatically removed with the directory */
|
||||
kset_unregister(kset);
|
||||
}
|
||||
|
||||
/* kobjects & kset representing top-level, by_key, and by_name folders */
|
||||
static struct kobject *fw_cfg_top_ko;
|
||||
static struct kobject *fw_cfg_sel_ko;
|
||||
static struct kset *fw_cfg_fname_kset;
|
||||
|
||||
/* register an individual fw_cfg file */
|
||||
static int fw_cfg_register_file(const struct fw_cfg_file *f)
|
||||
{
|
||||
int err;
|
||||
struct fw_cfg_sysfs_entry *entry;
|
||||
|
||||
/* allocate new entry */
|
||||
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
||||
if (!entry)
|
||||
return -ENOMEM;
|
||||
|
||||
/* set file entry information */
|
||||
memcpy(&entry->f, f, sizeof(struct fw_cfg_file));
|
||||
|
||||
/* register entry under "/sys/firmware/qemu_fw_cfg/by_key/" */
|
||||
err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype,
|
||||
fw_cfg_sel_ko, "%d", entry->f.select);
|
||||
if (err)
|
||||
goto err_register;
|
||||
|
||||
/* add raw binary content access */
|
||||
err = sysfs_create_bin_file(&entry->kobj, &fw_cfg_sysfs_attr_raw);
|
||||
if (err)
|
||||
goto err_add_raw;
|
||||
|
||||
/* try adding "/sys/firmware/qemu_fw_cfg/by_name/" symlink */
|
||||
fw_cfg_build_symlink(fw_cfg_fname_kset, &entry->kobj, entry->f.name);
|
||||
|
||||
/* success, add entry to global cache */
|
||||
fw_cfg_sysfs_cache_enlist(entry);
|
||||
return 0;
|
||||
|
||||
err_add_raw:
|
||||
kobject_del(&entry->kobj);
|
||||
err_register:
|
||||
kfree(entry);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* iterate over all fw_cfg directory entries, registering each one */
|
||||
static int fw_cfg_register_dir_entries(void)
|
||||
{
|
||||
int ret = 0;
|
||||
u32 count, i;
|
||||
struct fw_cfg_file *dir;
|
||||
size_t dir_size;
|
||||
|
||||
fw_cfg_read_blob(FW_CFG_FILE_DIR, &count, 0, sizeof(count));
|
||||
count = be32_to_cpu(count);
|
||||
dir_size = count * sizeof(struct fw_cfg_file);
|
||||
|
||||
dir = kmalloc(dir_size, GFP_KERNEL);
|
||||
if (!dir)
|
||||
return -ENOMEM;
|
||||
|
||||
fw_cfg_read_blob(FW_CFG_FILE_DIR, dir, sizeof(count), dir_size);
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
dir[i].size = be32_to_cpu(dir[i].size);
|
||||
dir[i].select = be16_to_cpu(dir[i].select);
|
||||
ret = fw_cfg_register_file(&dir[i]);
|
||||
if (ret)
|
||||
break;
|
||||
}
|
||||
|
||||
kfree(dir);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* unregister top-level or by_key folder */
|
||||
static inline void fw_cfg_kobj_cleanup(struct kobject *kobj)
|
||||
{
|
||||
kobject_del(kobj);
|
||||
kobject_put(kobj);
|
||||
}
|
||||
|
||||
static int fw_cfg_sysfs_probe(struct platform_device *pdev)
|
||||
{
|
||||
int err;
|
||||
|
||||
/* NOTE: If we supported multiple fw_cfg devices, we'd first create
|
||||
* a subdirectory named after e.g. pdev->id, then hang per-device
|
||||
* by_key (and by_name) subdirectories underneath it. However, only
|
||||
* one fw_cfg device exist system-wide, so if one was already found
|
||||
* earlier, we might as well stop here.
|
||||
*/
|
||||
if (fw_cfg_sel_ko)
|
||||
return -EBUSY;
|
||||
|
||||
/* create by_key and by_name subdirs of /sys/firmware/qemu_fw_cfg/ */
|
||||
err = -ENOMEM;
|
||||
fw_cfg_sel_ko = kobject_create_and_add("by_key", fw_cfg_top_ko);
|
||||
if (!fw_cfg_sel_ko)
|
||||
goto err_sel;
|
||||
fw_cfg_fname_kset = kset_create_and_add("by_name", NULL, fw_cfg_top_ko);
|
||||
if (!fw_cfg_fname_kset)
|
||||
goto err_name;
|
||||
|
||||
/* initialize fw_cfg device i/o from platform data */
|
||||
err = fw_cfg_do_platform_probe(pdev);
|
||||
if (err)
|
||||
goto err_probe;
|
||||
|
||||
/* get revision number, add matching top-level attribute */
|
||||
fw_cfg_read_blob(FW_CFG_ID, &fw_cfg_rev, 0, sizeof(fw_cfg_rev));
|
||||
fw_cfg_rev = le32_to_cpu(fw_cfg_rev);
|
||||
err = sysfs_create_file(fw_cfg_top_ko, &fw_cfg_rev_attr.attr);
|
||||
if (err)
|
||||
goto err_rev;
|
||||
|
||||
/* process fw_cfg file directory entry, registering each file */
|
||||
err = fw_cfg_register_dir_entries();
|
||||
if (err)
|
||||
goto err_dir;
|
||||
|
||||
/* success */
|
||||
pr_debug("fw_cfg: loaded.\n");
|
||||
return 0;
|
||||
|
||||
err_dir:
|
||||
fw_cfg_sysfs_cache_cleanup();
|
||||
sysfs_remove_file(fw_cfg_top_ko, &fw_cfg_rev_attr.attr);
|
||||
err_rev:
|
||||
fw_cfg_io_cleanup();
|
||||
err_probe:
|
||||
fw_cfg_kset_unregister_recursive(fw_cfg_fname_kset);
|
||||
err_name:
|
||||
fw_cfg_kobj_cleanup(fw_cfg_sel_ko);
|
||||
err_sel:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fw_cfg_sysfs_remove(struct platform_device *pdev)
|
||||
{
|
||||
pr_debug("fw_cfg: unloading.\n");
|
||||
fw_cfg_sysfs_cache_cleanup();
|
||||
fw_cfg_kset_unregister_recursive(fw_cfg_fname_kset);
|
||||
fw_cfg_kobj_cleanup(fw_cfg_sel_ko);
|
||||
fw_cfg_io_cleanup();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id fw_cfg_sysfs_mmio_match[] = {
|
||||
{ .compatible = "qemu,fw-cfg-mmio", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, fw_cfg_sysfs_mmio_match);
|
||||
|
||||
#ifdef CONFIG_ACPI
|
||||
static const struct acpi_device_id fw_cfg_sysfs_acpi_match[] = {
|
||||
{ "QEMU0002", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, fw_cfg_sysfs_acpi_match);
|
||||
#endif
|
||||
|
||||
static struct platform_driver fw_cfg_sysfs_driver = {
|
||||
.probe = fw_cfg_sysfs_probe,
|
||||
.remove = fw_cfg_sysfs_remove,
|
||||
.driver = {
|
||||
.name = "fw_cfg",
|
||||
.of_match_table = fw_cfg_sysfs_mmio_match,
|
||||
.acpi_match_table = ACPI_PTR(fw_cfg_sysfs_acpi_match),
|
||||
},
|
||||
};
|
||||
|
||||
#ifdef CONFIG_FW_CFG_SYSFS_CMDLINE
|
||||
|
||||
static struct platform_device *fw_cfg_cmdline_dev;
|
||||
|
||||
/* this probably belongs in e.g. include/linux/types.h,
|
||||
* but right now we are the only ones doing it...
|
||||
*/
|
||||
#ifdef CONFIG_PHYS_ADDR_T_64BIT
|
||||
#define __PHYS_ADDR_PREFIX "ll"
|
||||
#else
|
||||
#define __PHYS_ADDR_PREFIX ""
|
||||
#endif
|
||||
|
||||
/* use special scanf/printf modifier for phys_addr_t, resource_size_t */
|
||||
#define PH_ADDR_SCAN_FMT "@%" __PHYS_ADDR_PREFIX "i%n" \
|
||||
":%" __PHYS_ADDR_PREFIX "i" \
|
||||
":%" __PHYS_ADDR_PREFIX "i%n"
|
||||
|
||||
#define PH_ADDR_PR_1_FMT "0x%" __PHYS_ADDR_PREFIX "x@" \
|
||||
"0x%" __PHYS_ADDR_PREFIX "x"
|
||||
|
||||
#define PH_ADDR_PR_3_FMT PH_ADDR_PR_1_FMT \
|
||||
":%" __PHYS_ADDR_PREFIX "u" \
|
||||
":%" __PHYS_ADDR_PREFIX "u"
|
||||
|
||||
static int fw_cfg_cmdline_set(const char *arg, const struct kernel_param *kp)
|
||||
{
|
||||
struct resource res[3] = {};
|
||||
char *str;
|
||||
phys_addr_t base;
|
||||
resource_size_t size, ctrl_off, data_off;
|
||||
int processed, consumed = 0;
|
||||
|
||||
/* only one fw_cfg device can exist system-wide, so if one
|
||||
* was processed on the command line already, we might as
|
||||
* well stop here.
|
||||
*/
|
||||
if (fw_cfg_cmdline_dev) {
|
||||
/* avoid leaking previously registered device */
|
||||
platform_device_unregister(fw_cfg_cmdline_dev);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* consume "<size>" portion of command line argument */
|
||||
size = memparse(arg, &str);
|
||||
|
||||
/* get "@<base>[:<ctrl_off>:<data_off>]" chunks */
|
||||
processed = sscanf(str, PH_ADDR_SCAN_FMT,
|
||||
&base, &consumed,
|
||||
&ctrl_off, &data_off, &consumed);
|
||||
|
||||
/* sscanf() must process precisely 1 or 3 chunks:
|
||||
* <base> is mandatory, optionally followed by <ctrl_off>
|
||||
* and <data_off>;
|
||||
* there must be no extra characters after the last chunk,
|
||||
* so str[consumed] must be '\0'.
|
||||
*/
|
||||
if (str[consumed] ||
|
||||
(processed != 1 && processed != 3))
|
||||
return -EINVAL;
|
||||
|
||||
res[0].start = base;
|
||||
res[0].end = base + size - 1;
|
||||
res[0].flags = !strcmp(kp->name, "mmio") ? IORESOURCE_MEM :
|
||||
IORESOURCE_IO;
|
||||
|
||||
/* insert register offsets, if provided */
|
||||
if (processed > 1) {
|
||||
res[1].name = "ctrl";
|
||||
res[1].start = ctrl_off;
|
||||
res[1].flags = IORESOURCE_REG;
|
||||
res[2].name = "data";
|
||||
res[2].start = data_off;
|
||||
res[2].flags = IORESOURCE_REG;
|
||||
}
|
||||
|
||||
/* "processed" happens to nicely match the number of resources
|
||||
* we need to pass in to this platform device.
|
||||
*/
|
||||
fw_cfg_cmdline_dev = platform_device_register_simple("fw_cfg",
|
||||
PLATFORM_DEVID_NONE, res, processed);
|
||||
if (IS_ERR(fw_cfg_cmdline_dev))
|
||||
return PTR_ERR(fw_cfg_cmdline_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fw_cfg_cmdline_get(char *buf, const struct kernel_param *kp)
|
||||
{
|
||||
/* stay silent if device was not configured via the command
|
||||
* line, or if the parameter name (ioport/mmio) doesn't match
|
||||
* the device setting
|
||||
*/
|
||||
if (!fw_cfg_cmdline_dev ||
|
||||
(!strcmp(kp->name, "mmio") ^
|
||||
(fw_cfg_cmdline_dev->resource[0].flags == IORESOURCE_MEM)))
|
||||
return 0;
|
||||
|
||||
switch (fw_cfg_cmdline_dev->num_resources) {
|
||||
case 1:
|
||||
return snprintf(buf, PAGE_SIZE, PH_ADDR_PR_1_FMT,
|
||||
resource_size(&fw_cfg_cmdline_dev->resource[0]),
|
||||
fw_cfg_cmdline_dev->resource[0].start);
|
||||
case 3:
|
||||
return snprintf(buf, PAGE_SIZE, PH_ADDR_PR_3_FMT,
|
||||
resource_size(&fw_cfg_cmdline_dev->resource[0]),
|
||||
fw_cfg_cmdline_dev->resource[0].start,
|
||||
fw_cfg_cmdline_dev->resource[1].start,
|
||||
fw_cfg_cmdline_dev->resource[2].start);
|
||||
}
|
||||
|
||||
/* Should never get here */
|
||||
WARN(1, "Unexpected number of resources: %d\n",
|
||||
fw_cfg_cmdline_dev->num_resources);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct kernel_param_ops fw_cfg_cmdline_param_ops = {
|
||||
.set = fw_cfg_cmdline_set,
|
||||
.get = fw_cfg_cmdline_get,
|
||||
};
|
||||
|
||||
device_param_cb(ioport, &fw_cfg_cmdline_param_ops, NULL, S_IRUSR);
|
||||
device_param_cb(mmio, &fw_cfg_cmdline_param_ops, NULL, S_IRUSR);
|
||||
|
||||
#endif /* CONFIG_FW_CFG_SYSFS_CMDLINE */
|
||||
|
||||
static int __init fw_cfg_sysfs_init(void)
|
||||
{
|
||||
/* create /sys/firmware/qemu_fw_cfg/ top level directory */
|
||||
fw_cfg_top_ko = kobject_create_and_add("qemu_fw_cfg", firmware_kobj);
|
||||
if (!fw_cfg_top_ko)
|
||||
return -ENOMEM;
|
||||
|
||||
return platform_driver_register(&fw_cfg_sysfs_driver);
|
||||
}
|
||||
|
||||
static void __exit fw_cfg_sysfs_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&fw_cfg_sysfs_driver);
|
||||
|
||||
#ifdef CONFIG_FW_CFG_SYSFS_CMDLINE
|
||||
platform_device_unregister(fw_cfg_cmdline_dev);
|
||||
#endif
|
||||
|
||||
/* clean up /sys/firmware/qemu_fw_cfg/ */
|
||||
fw_cfg_kobj_cleanup(fw_cfg_top_ko);
|
||||
}
|
||||
|
||||
module_init(fw_cfg_sysfs_init);
|
||||
module_exit(fw_cfg_sysfs_exit);
|
||||
|
|
@ -691,15 +691,22 @@ static struct kernfs_node *kernfs_walk_ns(struct kernfs_node *parent,
|
|||
const unsigned char *path,
|
||||
const void *ns)
|
||||
{
|
||||
static char path_buf[PATH_MAX]; /* protected by kernfs_mutex */
|
||||
size_t len = strlcpy(path_buf, path, PATH_MAX);
|
||||
char *p = path_buf;
|
||||
char *name;
|
||||
size_t len;
|
||||
char *p, *name;
|
||||
|
||||
lockdep_assert_held(&kernfs_mutex);
|
||||
|
||||
if (len >= PATH_MAX)
|
||||
/* grab kernfs_rename_lock to piggy back on kernfs_pr_cont_buf */
|
||||
spin_lock_irq(&kernfs_rename_lock);
|
||||
|
||||
len = strlcpy(kernfs_pr_cont_buf, path, sizeof(kernfs_pr_cont_buf));
|
||||
|
||||
if (len >= sizeof(kernfs_pr_cont_buf)) {
|
||||
spin_unlock_irq(&kernfs_rename_lock);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
p = kernfs_pr_cont_buf;
|
||||
|
||||
while ((name = strsep(&p, "/")) && parent) {
|
||||
if (*name == '\0')
|
||||
|
|
@ -707,6 +714,8 @@ static struct kernfs_node *kernfs_walk_ns(struct kernfs_node *parent,
|
|||
parent = kernfs_find_ns(parent, name, ns);
|
||||
}
|
||||
|
||||
spin_unlock_irq(&kernfs_rename_lock);
|
||||
|
||||
return parent;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -162,6 +162,14 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
|
|||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
static inline struct dentry *debugfs_create_automount(const char *name,
|
||||
struct dentry *parent,
|
||||
struct vfsmount *(*f)(void *),
|
||||
void *data)
|
||||
{
|
||||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
static inline void debugfs_remove(struct dentry *dentry)
|
||||
{ }
|
||||
|
||||
|
|
|
|||
|
|
@ -861,6 +861,7 @@ struct kobject *kset_find_obj(struct kset *kset, const char *name)
|
|||
spin_unlock(&kset->list_lock);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kset_find_obj);
|
||||
|
||||
static void kset_release(struct kobject *kobj)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue