kernel.git/drivers/dma/ptdma/ptdma-dev.c, branch linux-6.3.y

ptdma: pt_core_execute_cmd() should use spinlock

2023-01-19T13:29:34Z

The interrupt handler (pt_core_irq_handler()) of the ptdma driver can be called from interrupt context. The code flow in this function can lead down to pt_core_execute_cmd() which will attempt to grab a mutex, which is not appropriate in interrupt context and ultimately leads to a kernel panic. The fix here changes this mutex to a spinlock, which has been verified to resolve the issue. Fixes: fa5d823b16a9 ("dmaengine: ptdma: Initial driver for the AMD PTDMA") Signed-off-by: Eric Pilmore Link: https://lore.kernel.org/r/20230119033907.35071-1-epilmore@gigaio.com Signed-off-by: Vinod Koul

dmaengine: PTDMA: support polled mode

2022-04-20T11:08:19Z

If the DMA_PREP_INTERRUPT flag is not provided, run in polled mode, which significantly improves IOPS: more than twice on chunks < 4K. Signed-off-by: Ilya Novikov Link: https://lore.kernel.org/r/20220413113733.59041-1-i.m.novikov@yadro.com Signed-off-by: Vinod Koul

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

2022-02-15T05:17:36Z

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: Add debugfs entries for PTDMA

2021-08-29T13:44:20Z

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

2021-08-29T13:44:20Z

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

2021-08-29T13:44:20Z

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