linux-toradex.git/drivers/dma/ptdma, branch v5.18

Merge tag 'dmaengine-fix-5.17' into next

2022-03-10T04:42:25+00:00

This merges dmaengine/dmaengine-fix-5.17 tag into next as that is
already merged mainline and resolves depencency in patches

dmaengine: ptdma: handle the cases based on DMA is complete

2022-02-15T05:24:54+00:00

There is a need to segregate the cases when DMA is complete or not.
In case if DMA is already complete there is no need to handle it
again and gracefully exit from the function.

Signed-off-by: Sanjay R Mehta 
Link: https://lore.kernel.org/r/1643814880-3882-3-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul

dmaengine: ptdma: fix concurrency issue with multiple dma transfer

2022-02-15T05:24:54+00:00

The command should be submitted only if the engine is idle,
for this, the next available descriptor is checked and set the flag
to false in case the descriptor is non-empty.

Signed-off-by: Sanjay R Mehta 
Link: https://lore.kernel.org/r/1643814880-3882-2-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul

dmaengine: ptdma: Fix the error handling path in pt_core_init()

2022-02-15T05:17:36+00:00

In order to free resources correctly in the error handling path of
pt_core_init(), 2 goto's have to be switched. Otherwise, some resources
will leak and we will try to release things that have not been allocated
yet.

Also move a dev_err() to a place where it is more meaningful.

Fixes: fa5d823b16a9 ("dmaengine: ptdma: Initial driver for the AMD PTDMA")
Signed-off-by: Christophe JAILLET 
Acked-by: Sanjay R Mehta 
Reviewed-by: Dan Carpenter 
Link: https://lore.kernel.org/r/41a963a35173f89c874f5c44df5530dc09fea8da.1644044244.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul

dmaengine: ptdma: remove PT_OFFSET to avoid redefnition

2021-08-29T13:44:21+00:00

Building on ARCH=um causes a "redefined" warning, so remove this
PT_OFFSET macro to avoid the warning.

drivers/dma/ptdma/ptdma.h:34: warning: "PT_OFFSET" redefined
34 | #define PT_OFFSET   0x0
|
In file included from ./arch/um/include/asm/thread_info.h:17,
from ./include/linux/thread_info.h:60,
from ./include/asm-generic/preempt.h:5,
from ./arch/um/include/generated/asm/preempt.h:1,
from ./include/linux/preempt.h:78,
from ./include/linux/spinlock.h:55,
from ./include/linux/wait.h:9,
from ./include/linux/wait_bit.h:8,
from ./include/linux/fs.h:6,
from ./include/linux/debugfs.h:15,
from drivers/dma/ptdma/ptdma-debugfs.c:12:
./arch/x86/um/shared/sysdep/ptrace_user.h:4: note: this is the location of the previous definition
4 | #define PT_OFFSET(r) ((r) * sizeof(long))

Reported-by: kernel test robot 
Fixes: 2a99524459ce ("dmaengine: ptdma: Initial driver for the AMD PTDMA")
Signed-off-by: Sanjay R Mehta 
Link: https://lore.kernel.org/r/1630178908-54973-1-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul

dmaengine: ptdma: Add debugfs entries for PTDMA

2021-08-29T13:44:20+00:00

Expose data about the configuration and operation of the
PTDMA through debugfs entries: device name, capabilities,
configuration, statistics.

Signed-off-by: Sanjay R Mehta 
Link: https://lore.kernel.org/r/1629208559-51964-4-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul

dmaengine: ptdma: register PTDMA controller as a DMA resource

2021-08-29T13:44:20+00:00

Register ptdma queue to Linux dmaengine framework as general-purpose
DMA channels.

Signed-off-by: Sanjay R Mehta 
Link: https://lore.kernel.org/r/1629208559-51964-3-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul

dmaengine: ptdma: Initial driver for the AMD PTDMA

2021-08-29T13:44:20+00:00

Add support for AMD PTDMA controller. It performs high-bandwidth
memory to memory and IO copy operation. Device commands are managed
via a circular queue of 'descriptors', each of which specifies source
and destination addresses for copying a single buffer of data.

Signed-off-by: Sanjay R Mehta 
Link: https://lore.kernel.org/r/1629208559-51964-2-git-send-email-Sanju.Mehta@amd.com
Signed-off-by: Vinod Koul