| Commit message (Collapse) | Author | Age | Files | Lines |
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git://git.linaro.org/people/sumitsemwal/linux-dma-buf
Pull dma-buf updates from Sumit Semwal:
"This includes the following key items:
- kernel cpu access support,
- flag-passing to dma_buf_fd,
- relevant Documentation updates, and
- some minor cleanups and fixes.
These changes are needed for the drm prime/dma-buf interface code that
Dave Airlie plans to submit in this merge window."
* 'for-linus-3.4' of git://git.linaro.org/people/sumitsemwal/linux-dma-buf:
dma-buf: correct dummy function declarations.
dma-buf: document fd flags and O_CLOEXEC requirement
dma_buf: Add documentation for the new cpu access support
dma-buf: add support for kernel cpu access
dma-buf: don't hold the mutex around map/unmap calls
dma-buf: add get_dma_buf()
dma-buf: pass flags into dma_buf_fd.
dma-buf: add dma_data_direction to unmap dma_buf_op
dma-buf: Move code out of mutex-protected section in dma_buf_attach()
dma-buf: Return error instead of using a goto statement when possible
dma-buf: Remove unneeded sanity checks
dma-buf: Constify ops argument to dma_buf_export()
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Big differences to other contenders in the field (like ion) is
that this also supports highmem, so we have to split up the cpu
access from the kernel side into a prepare and a kmap step.
Prepare is allowed to fail and should do everything required so that
the kmap calls can succeed (like swapin/backing storage allocation,
flushing, ...).
More in-depth explanations will follow in the follow-up documentation
patch.
Changes in v2:
- Clear up begin_cpu_access confusion noticed by Sumit Semwal.
- Don't automatically fallback from the _atomic variants to the
non-atomic variants. The _atomic callbacks are not allowed to
sleep, so we want exporters to make this decision explicit. The
function signatures are explicit, so simpler exporters can still
use the same function for both.
- Make the unmap functions optional. Simpler exporters with permanent
mappings don't need to do anything at unmap time.
Changes in v3:
- Adjust the WARN_ON checks for the new ->ops functions as suggested
by Rob Clark and Sumit Semwal.
- Rebased on top of latest dma-buf-next git.
Changes in v4:
- Fixup a missing - in a return -EINVAL; statement.
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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The mutex protects the attachment list and hence needs to be held
around the callbakc to the exporters (optional) attach/detach
functions.
Holding the mutex around the map/unmap calls doesn't protect any
dma_buf state. Exporters need to properly protect any of their own
state anyway (to protect against calls from their own interfaces).
So this only makes the locking messier (and lockdep easier to anger).
Therefore let's just drop this.
v2: Rebased on top of latest dma-buf-next git.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Rob Clark <rob.clark@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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We need to pass the flags into dma_buf_fd at this point,
so the flags end up doing the right thing for O_CLOEXEC.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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Some exporters may use DMA map/unmap APIs in dma-buf ops, which require
enum dma_data_direction for both map and unmap operations.
Thus, the unmap dma_buf_op also needs to have enum dma_data_direction as
a parameter.
Reported-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: Sumit Semwal <sumit.semwal@ti.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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Some fields can be set without mutex protection. Initialize them before
locking the mutex.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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Remove an error label in dma_buf_attach() that just returns an error
code.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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ops, ops->map_dma_buf and ops->unmap_dma_buf are guaranteed to be
non-NULL by a check in dma_buf_export(). Remove NULL checks on those
variables in the other API functions.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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This allows drivers to make the dma buf operations structure constant.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
Pull <linux/device.h> avoidance patches from Paul Gortmaker:
"Nearly every subsystem has some kind of header with a proto like:
void foo(struct device *dev);
and yet there is no reason for most of these guys to care about the
sub fields within the device struct. This allows us to significantly
reduce the scope of headers including headers. For this instance, a
reduction of about 40% is achieved by replacing the include with the
simple fact that the device is some kind of a struct.
Unlike the much larger module.h cleanup, this one is simply two
commits. One to fix the implicit <linux/device.h> users, and then one
to delete the device.h includes from the linux/include/ dir wherever
possible."
* tag 'device-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux:
device.h: audit and cleanup users in main include dir
device.h: cleanup users outside of linux/include (C files)
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For files that are actively using linux/device.h, make sure
that they call it out. This will allow us to clean up some
of the implicit uses of linux/device.h within include/*
without introducing build regressions.
Yes, this was created by "cheating" -- i.e. the headers were
cleaned up, and then the fallout was found and fixed, and then
the two commits were reordered. This ensures we don't introduce
build regressions into the git history.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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Remove for_each_set_bit_cont() after confirming that no one uses
for_each_set_bit_cont() anymore.
[sfr@canb.auug.org.au: regmap: cope with bitops API change]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap updates from Mark Brown:
"Things are really quieting down with the regmap API, while we're still
seeing a trickle of new features coming in they're getting much
smaller than they were. It's also nice to have some features which
support other subsystems building infrastructure on top of regmap.
Highlights include:
- Support for padding between the register and the value when
interacting with the device, sometimes needed for fast interfaces.
- Support for applying register updates to the device when restoring
the register state. This is intended to be used to apply updates
supplied by manufacturers for tuning the performance of the device
(many of which are to undocumented registers which aren't otherwise
covered).
- Support for multi-register operations on cached registers.
- Support for syncing only part of the register cache.
- Stubs and parameter query functions intended to make it easier for
other subsystems to build infrastructure on top of the regmap API.
plus a few driver updates making use of the new features which it was
easier to merge via this tree."
* tag 'regmap-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap: (41 commits)
regmap: Fix future missing prototype of devres_alloc() and friends
regmap: Rejig struct declarations for stubbed API
regmap: Fix rbtree block base in sync
regcache: Make sure we sync register 0 in an rbtree cache
regmap: delete unused module.h from drivers/base/regmap files
regmap: Add stub for regcache_sync_region()
mfd: Improve performance of later WM1811 revisions
regmap: Fix x86_64 breakage
regmap: Allow drivers to sync only part of the register cache
regmap: Supply ranges to the sync operations
regmap: Add tracepoints for cache only and cache bypass
regmap: Mark the cache as clean after a successful sync
regmap: Remove default cache sync implementation
regmap: Skip hardware defaults for LZO caches
regmap: Expose the driver name in debugfs
mfd: wm8400: Convert to devm_regmap_init_i2c()
mfd: wm831x: Convert to devm_regmap_init()
mfd: wm8994: Convert to devm_regmap_init()
mfd/ASoC: Convert WM8994 driver to use regmap patches
mfd: Add __devinit and __devexit annotations in wm8994
...
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During regcache_init, if client has not passed the
default data of cached register then it is directly
read from the hw to initialize cache. This hw register
read happens before cache ops are initialized and hence
avoiding register read to check for the data available
on cache or not by enabling flag of cache_bypass.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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The bulk_write() supports the data transfer to multi
register which takes the data into cpu_endianness format
and does formatting of data to device format before
sending to device.
The transfer can be completed in single transfer or multiple
transfer based on data formatting.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Adding support for caching of data into the
non-volatile register from the call of reg_raw_write().
This will allow the larger block of data write into multiple
register without worrying whether register is cached or not
through reg_raw_write().
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Simple add/add conflict:
drivers/base/regmap/regmap.c
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into regmap-next
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Otherwise we'll end up running with bogus register numbers.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Provide a regcache_sync_region() operation which allows drivers to
write only part of the cache back to the hardware. This is intended
for use in cases like power domains or DSP memories where part of the
device register map may be reset without fully resetting the device.
Fully supporting these devices is likely to require additional work to
make specific regions of the register map cache only while they are in
reset, but this is enough for most devices.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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In order to allow us to support partial sync operations add minimum and
maximum register arguments to the sync operation and update the rbtree
and lzo caches to use this new information. The LZO implementation is
obviously not good, we could exit the iteration earlier, but there may
be room for more wide reaching optimisation there.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Previously the cache would never be marked clean, meaning syncs would
never be suppressed which isn't the end of the world but could be
inefficient.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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It's not used as all cache types have sync operations so it's just dead
code which never gets tested.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Resolved simple add/add conflicts:
drivers/base/regmap/internal.h
drivers/base/regmap/regmap.c
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap into regmap-drivers
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The first parameter should be "number of elements" and the second parameter
should be "element size".
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Otherwise any patch that affects a register which is writable may trash
cached values.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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On the basis that if we don't actually need to resync the cache then the
patches are probably also already applied.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap into regmap-drivers
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into regmap-next
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Save error handling and unwinding code in drivers by providing managed
versions of the regmap init functions, simplifying usage.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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[Fix for breakage which will be introduced during the merge window via
header reworks in another tree, the regmap tree does include device.h
but Paul's tree breaks that. Reworded subject to reflect -- broonie]
regmap.s uses devres_alloc() and others that are prototyped in device.h.
Include that to solve the following:
drivers/base/regmap/regmap.c: In function 'devm_regmap_init':
drivers/base/regmap/regmap.c:331:2: error: implicit declaration of function 'devres_alloc' [-Werror=implicit-function-declaration]
drivers/base/regmap/regmap.c:338:3: error: implicit declaration of function 'devres_add' [-Werror=implicit-function-declaration]
drivers/base/regmap/regmap.c:340:3: error: implicit declaration of function 'devres_free' [-Werror=implicit-function-declaration]
drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
drivers/base/regmap/regmap.c:421:5: error: implicit declaration of function 'dev_err' [-Werror=implicit-function-declaration]
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Most of the current users have register 0 as a volatile register or don't
have a register 0 so it's not been apparent that it's not getting synced.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Remove unused module.h and/or replace with export.h
as required.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Useful for figuring out where the hardware interaction went or came from.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Saves some I/O when resyncing; we assume that syncs start from the device
reset state.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Add a file called 'name' containing the name of the driver.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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To enable writing to the regmap debugfs registers file users will
need to modify the source directly and #define REGMAP_ALLOW_WRITE_DEBUGFS.
The reason for this is that it is dangerous to expose this
functionality in general where clients could potentially be PMICs.
[A couple of minor style updates -- broonie]
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Fall back to a register by register read to do so; most likely we'll be
cache only so the overhead will be low.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Show all the cache status flags in debugfs if we have a cache.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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This was a cut'n'paste from some older code.
Since we're about to add debugfs support don't do the obvious thing and
use bool, use u32 instead (which debugfs has been using since time
immemorial).
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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regcache_set_val() returns false if cache[idx] != val.
Thus it actually is not unreachable.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Using .format_write means, we have a custom function to write to the
chip, but not to read back. Also, mark registers as "not precious" and
"not volatile" which is implicit because we cannot read them. Make those
functions use 'regmap_readable' to reuse the checks done there.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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For the upcoming 2/6-format, we don't see debugfs output otherwise,
since the current division results in 0. I'd think 10/14 is broken
currently, too.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Most of the data exposed via debugfs is for or from the cache so reset
all the debugfs configuration to make sure everything is up to date with
the latest configuration, especially if we're changing cache type.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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They have no current users which is fortunate as they don't take the lock
and therefore aren't safe to use externally. We'll need to add new
operations if direct cache access is needed.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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