Commit Graph

22 Commits

Author SHA1 Message Date
Arnd Bergmann
1b7369acc4 media: headers: fix linux/mod_devicetable.h inclusions
A couple of drivers produced build errors after the mod_devicetable.h
header was split out from the platform_device one, e.g.

drivers/media/platform/davinci/vpbe_osd.c:42:40: error: array type has incomplete element type 'struct platform_device_id'
drivers/media/platform/davinci/vpbe_venc.c:42:40: error: array type has incomplete element type 'struct platform_device_id'

This adds the inclusion where needed.

Fixes: ac3167257b ("headers: separate linux/mod_devicetable.h from linux/platform_device.h")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-08-02 18:30:54 -04:00
Marc-André Lureau
2d6d60a3d3 fw_cfg: write vmcoreinfo details
If the "etc/vmcoreinfo" fw_cfg file is present and we are not running
the kdump kernel, write the addr/size of the vmcoreinfo ELF note.

The DMA operation is expected to run synchronously with today qemu,
but the specification states that it may become async, so we run
"control" field check in a loop for eventual changes.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:41 +02:00
Marc-André Lureau
14d1824c76 fw_cfg: add DMA register
Add an optional <dma_off> kernel module (or command line) parameter
using the following syntax:

      [qemu_fw_cfg.]ioport=<size>@<base>[:<ctrl_off>:<data_off>[:<dma_off>]]
 or
      [qemu_fw_cfg.]mmio=<size>@<base>[:<ctrl_off>:<data_off>[:<dma_off>]]

and initializes the register address using given or default offset.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:40 +02:00
Marc-André Lureau
1f57bc12d8 fw_cfg: add a public uapi header
Create a common header file for well-known values and structures to be
shared by the Linux kernel with qemu or other projects.

It is based from qemu/docs/specs/fw_cfg.txt which references
qemu/include/hw/nvram/fw_cfg_keys.h "for the most up-to-date and
authoritative list" & vmcoreinfo.txt. Those files don't have an
explicit license, but qemu/hw/nvram/fw_cfg.c is BSD-license, so
Michael S. Tsirkin suggested to use the same license.

The patch intentionally left out DMA & vmcoreinfo structures &
defines, which are added in the commits making usage of it.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:40 +02:00
Marc-André Lureau
b1cc4097d1 fw_cfg: handle fw_cfg_read_blob() error
fw_cfg_read_blob() may fail, but does not return error. This may lead
to surprising behaviours, like populating zero file entries (in
register_file() or during read). Return an error if ACPI locking
failed. Also, the following DMA read/write extension will add more
error paths that should be handled appropriately.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:39 +02:00
Marc-André Lureau
59ecab182f fw_cfg: remove inline from fw_cfg_read_blob()
The function is not small and getting bigger.

Let the compiler decide instead. No profiling done, hopefully
unnecessary.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:39 +02:00
Marc-André Lureau
3d47a34ba6 fw_cfg: fix sparse warnings around FW_CFG_FILE_DIR read
Use struct fw_cfg_files to read the directory size, fixing the sparse
warnings:

drivers/firmware/qemu_fw_cfg.c:485:17: warning: cast to restricted __be32

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:39 +02:00
Marc-André Lureau
f295c8dba7 fw_cfg: fix sparse warning reading FW_CFG_ID
Use a restricted type for reading FW_CFG_ID, fixing sparse warning:

drivers/firmware/qemu_fw_cfg.c:540:22: warning: cast to restricted __le32

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:38 +02:00
Marc-André Lureau
d174ea7d38 fw_cfg: fix sparse warnings with fw_cfg_file
Modify fw_cfg_sysfs_entry to store entry values, instead of reusing
the restricted types.

Fixes warnings such as:

$ make C=1 CF=-D__CHECK_ENDIAN__ drivers/firmware/qemu_fw_cfg.o

drivers/firmware/qemu_fw_cfg.c:491:29: warning: incorrect type in assignment (different base types)
drivers/firmware/qemu_fw_cfg.c:491:29:    expected restricted __be32 [usertype] size
drivers/firmware/qemu_fw_cfg.c:491:29:    got unsigned int
drivers/firmware/qemu_fw_cfg.c:492:31: warning: incorrect type in assignment (different base types)
drivers/firmware/qemu_fw_cfg.c:492:31:    expected restricted __be16 [usertype] select
drivers/firmware/qemu_fw_cfg.c:492:31:    got int

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:38 +02:00
Marc-André Lureau
8d59d5bd8f fw_cfg: fix sparse warnings in fw_cfg_sel_endianness()
Dispatch to the appropriate iowrite() instead of casting restricted
type to u16.

- if fw_cfg_is_mmio:
  before: iowrite16(cpu_to_be16(key))
  after: iowrite16be(key)
- if !fw_cfg_is_mmio:
  before: iowrite16(cpu_to_le16(key))
  after: iowrite16(key)
  which is equivalent on little-endian systems, where fw_cfg IO is supported.

Fixes:
$ make C=1 CF=-D__CHECK_ENDIAN__ drivers/firmware/qemu_fw_cfg.o

drivers/firmware/qemu_fw_cfg.c:55:33: warning: restricted __be16 degrades to integer
drivers/firmware/qemu_fw_cfg.c:55:52: warning: restricted __le16 degrades to integer

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-03-20 03:17:37 +02:00
Vasyl Gomonovych
0a9e63aa39 firmware: Use PTR_ERR_OR_ZERO()
Fix ptr_ret.cocci warnings:
drivers/firmware/efi/efi.c:610:8-14: WARNING: PTR_ERR_OR_ZERO can be used

Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2018-01-31 01:47:34 +02:00
Marc-André Lureau
23f1b8d938 fw_cfg: fix driver remove
On driver remove(), all objects created during probe() should be
removed, but sysfs qemu_fw_cfg/rev file was left. Also reorder
functions to match probe() error cleanup code.

Cc: stable@vger.kernel.org
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-12-01 16:55:09 +02:00
Marc-André Lureau
c1d0c3f623 fw_cfg: fix the command line module name
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-11-14 23:57:40 +02:00
Linus Torvalds
3aa2fc1667 driver core update for 4.7-rc1
Here's the "big" driver core update for 4.7-rc1.
 
 Mostly just debugfs changes, the long-known and messy races with removing
 debugfs files should be fixed thanks to the great work of Nicolai Stange.  We
 also have some isa updates in here (the x86 maintainers told me to take it
 through this tree), a new warning when we run out of dynamic char major
 numbers, and a few other assorted changes, details in the shortlog.
 
 All have been in linux-next for some time with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here's the "big" driver core update for 4.7-rc1.

  Mostly just debugfs changes, the long-known and messy races with
  removing debugfs files should be fixed thanks to the great work of
  Nicolai Stange.  We also have some isa updates in here (the x86
  maintainers told me to take it through this tree), a new warning when
  we run out of dynamic char major numbers, and a few other assorted
  changes, details in the shortlog.

  All have been in linux-next for some time with no reported issues"

* tag 'driver-core-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (32 commits)
  Revert "base: dd: don't remove driver_data in -EPROBE_DEFER case"
  gpio: ws16c48: Utilize the ISA bus driver
  gpio: 104-idio-16: Utilize the ISA bus driver
  gpio: 104-idi-48: Utilize the ISA bus driver
  gpio: 104-dio-48e: Utilize the ISA bus driver
  watchdog: ebc-c384_wdt: Utilize the ISA bus driver
  iio: stx104: Utilize the module_isa_driver and max_num_isa_dev macros
  iio: stx104: Add X86 dependency to STX104 Kconfig option
  Documentation: Add ISA bus driver documentation
  isa: Implement the max_num_isa_dev macro
  isa: Implement the module_isa_driver macro
  pnp: pnpbios: Add explicit X86_32 dependency to PNPBIOS
  isa: Decouple X86_32 dependency from the ISA Kconfig option
  driver-core: use 'dev' argument in dev_dbg_ratelimited stub
  base: dd: don't remove driver_data in -EPROBE_DEFER case
  kernfs: Move faulting copy_user operations outside of the mutex
  devcoredump: add scatterlist support
  debugfs: unproxify files created through debugfs_create_u32_array()
  debugfs: unproxify files created through debugfs_create_blob()
  debugfs: unproxify files created through debugfs_create_bool()
  ...
2016-05-20 21:26:15 -07:00
Dan Carpenter
d4f6e272f2 firmware: qemu_fw_cfg.c: potential unintialized variable
It acpi_acquire_global_lock() return AE_NOT_CONFIGURED then "glk" isn't
initialized, which, if you got very unlucky, could cause a bug.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-04-21 16:12:36 +03:00
Greg Kroah-Hartman
5614e77258 Merge 4.6-rc4 into driver-core-next
We want those fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-04-19 04:28:28 +09:00
Gabriel Somlo
def7ac806a firmware: qemu_fw_cfg.c: hold ACPI global lock during device access
Allowing for the future possibility of implementing AML-based
(i.e., firmware-triggered) access to the QEMU fw_cfg device,
acquire the global ACPI lock when accessing the device on behalf
of the guest-side sysfs driver, to prevent any potential race
conditions.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-04-07 15:16:40 +03:00
Michael S. Tsirkin
e8aabc64d7 qemu_fw_cfg: don't leak kobj on init error
If platform_driver_register fails, we should
cleanup fw_cfg_top_ko before exiting.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Gabriel Somlo <somlo@cmu.edu>
2016-04-07 15:16:39 +03:00
Gabriel Somlo
00411b7b1e firmware: fw_cfg register offsets on supported architectures only
Refrain from defining default fw_cfg register offsets on
unsupported architectures -- throw an error instead. If
QEMU were to add fw_cfg support on additional architectures,
we should add them to the FW_CFG_SYSFS depends statement in
drivers/firmware/Kconfig, and provide default values for
register offsets in drivers/firmware/qemu_fw_cfg.c at that
time.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-03-29 10:11:44 -07:00
Valentin Rothberg
9b3ec23ae9 firmware: qemu_fw_cfg.c: fix typo FW_CFG_DATA_OFF
s/FW_CTRL_DATA_OFF/FW_CFG_DATA_OFF/

Signed-off-by: Valentin Rothberg <valentin.rothberg@posteo.net>
Signed-off-by: Andreas Ziegler <andreas.ziegler@fau.de>
Acked-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-11 19:24:57 -08:00
Gabriel Somlo
246c46ebae firmware: create directory hierarchy for sysfs fw_cfg entries
Each fw_cfg entry of type "file" has an associated 56-char,
nul-terminated ASCII string which represents its name. While
the fw_cfg device doesn't itself impose any specific naming
convention, QEMU developers have traditionally used path name
semantics (i.e. "etc/acpi/rsdp") to descriptively name the
various fw_cfg "blobs" passed into the guest.

This patch attempts, on a best effort basis, to create a
directory hierarchy representing the content of fw_cfg file
names, under /sys/firmware/qemu_fw_cfg/by_name.

Upon successful creation of all directories representing the
"dirname" portion of a fw_cfg file, a symlink will be created
to represent the "basename", pointing at the appropriate
/sys/firmware/qemu_fw_cfg/by_key entry. If a file name is not
suitable for this procedure (e.g., if its basename or dirname
components collide with an already existing dirname component
or basename, respectively) the corresponding fw_cfg blob is
skipped and will remain available in sysfs only by its selector
key value.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-09 17:37:39 -08:00
Gabriel Somlo
75f3e8e47f firmware: introduce sysfs driver for QEMU's fw_cfg device
Make fw_cfg entries of type "file" available via sysfs. Entries
are listed under /sys/firmware/qemu_fw_cfg/by_key, in folders
named after each entry's selector key. Filename, selector value,
and size read-only attributes are included for each entry. Also,
a "raw" attribute allows retrieval of the full binary content of
each entry.

The fw_cfg device can be instantiated automatically from ACPI or
the Device Tree, or manually by using a kernel module (or command
line) parameter, with a syntax outlined in the documentation file.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-09 17:37:39 -08:00