11 Mar, 2020
1 commit
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Create a placeholder directory for each registered DMA device.
DMA drivers can use the dmaengine_get_debugfs_root() call to get their
debugfs root and can populate with custom files to aim debugging.Signed-off-by: Peter Ujfalusi
Link: https://lore.kernel.org/r/20200306142839.17910-4-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul
21 Jan, 2020
2 commits
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The functions dma_get_slave_channel() and dma_get_any_slave_channel()
are called from DMA engine drivers only. Hence move their declarations
from the public header file to the private header
file drivers/dma/dmaengine.h.Signed-off-by: Geert Uytterhoeven
Acked-by: Arnd Bergmann
Link: https://lore.kernel.org/r/20200121093311.28639-4-geert+renesas@glider.be
Signed-off-by: Vinod Koul -
A DMA hardware can have big cache or FIFO and the amount of data sitting in
the DMA fabric can be an interest for the clients.For example in audio we want to know the delay in the data flow and in case
the DMA have significantly large FIFO/cache, it can affect the latenc/delaySigned-off-by: Peter Ujfalusi
Reviewed-by: Tero Kristo
Tested-by: Keerthy
Reviewed-by: Grygorii Strashko
Link: https://lore.kernel.org/r/20191223110458.30766-6-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul
02 Nov, 2017
1 commit
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Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.By default all files without license information are under the default
license of the kernel, which is GPL version 2.Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if
Reviewed-by: Philippe Ombredanne
Reviewed-by: Thomas Gleixner
Signed-off-by: Greg Kroah-Hartman
08 Aug, 2016
2 commits
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Adding a new callback that will provide the error result for a transaction.
The result is allocated on the stack and the callback should create a copy
if it wishes to retain the information after exiting. The result parameter
is now defined and takes over the dummy void pointer we placed in the
helper functions previously. dmaengine drivers should start converting
to the new "callback_result" callback in order to receive transaction
results.Signed-off-by: Dave Jiang
Reviewed-by: Lars-Peter Clausen
Signed-off-by: Vinod Koul -
Dmaengine does not provide a way to pass back the result from a DMA
transaction through the callback function. We are adding dmaengine
helper function in order to prep for a mechanism that allow result
status and other information through the callback. The initial conversion
will make the existing driver use these new helper functions but retain
the original behavior of the code. However, the helper functions paves
a way towards adding the result parameter through callback.Signed-off-by: Dave Jiang
Reviewed-by: Lars-Peter Clausen
Signed-off-by: Vinod Koul
13 Mar, 2012
5 commits
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Provide a common function to initialize a channels cookie values.
Signed-off-by: Russell King
Tested-by: Linus Walleij
Reviewed-by: Linus Walleij
Acked-by: Jassi Brar
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo
Signed-off-by: Vinod Koul -
Now that we have the completed cookie in the dma_chan structure, we
can consolidate the tx_status functions by providing a function to set
the txstate structure and returning the DMA status. We also provide
a separate helper to set the residue for cookies which are still in
progress.Signed-off-by: Russell King
Tested-by: Linus Walleij
Reviewed-by: Linus Walleij
Acked-by: Jassi Brar
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo
Signed-off-by: Vinod Koul -
Provide a common function to do the cookie mechanics for completing
a DMA descriptor.Signed-off-by: Russell King
Tested-by: Linus Walleij
Reviewed-by: Linus Walleij
Acked-by: Jassi Brar
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo
Signed-off-by: Vinod Koul -
Everyone deals with assigning DMA cookies in the same way (it's part of
the API so they should be), so lets consolidate the common code into a
helper function to avoid this duplication.Signed-off-by: Russell King
Tested-by: Linus Walleij
Reviewed-by: Linus Walleij
Acked-by: Jassi Brar
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo
Signed-off-by: Vinod Koul -
Add a local private header file to contain definitions and declarations
which should only be used by DMA engine drivers.We also fix linux/dmaengine.h to use LINUX_DMAENGINE_H to guard against
multiple inclusion.Signed-off-by: Russell King
Tested-by: Linus Walleij
Reviewed-by: Linus Walleij
Acked-by: Jassi Brar
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo
Signed-off-by: Vinod Koul
