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path: root/drivers/dma/at_hdmac.c
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2022-11-11dmaengine: at_hdmac: Convert driver to use virt-dmaTudor Ambarus
Convert the driver to use the core virt-dma. The driver will be easier to maintain as it uses the list handling and the tasklet from virt-dma. With the conversion replace the election of a new transfer in the tasklet with the election of the new transfer in the interrupt handler. With this we have a shorter idle window as we remove the scheduling latency of the tasklet. I chose to do this while doing the conversion to virt-dma, because if I made a prerequisite patch with the new transfer election in the irq handler, I would have to duplicate some virt-dma code in the at_hdmac driver that would end up being removed at the virt-dma conversion anyway. So do this in a single step. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-33-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Remove unused member of at_dma_chanTudor Ambarus
The pointer to at_dma engine was never used, remove it. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-32-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Rename "chan_common" to "dma_chan"Tudor Ambarus
"chan_common" was misleading and did not suggest that's actually a struct dma_chan underneath. Rename it so that readers can follow the code easier. One may see some checks when running checkpatch. Those have nothing to do with the rename and will be addressed in a further patch. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-31-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Rename "dma_common" to "dma_device"Tudor Ambarus
"dma_common" name was misleading and did not suggest that's actually a struct dma_device underneath. Rename it so that readers can follow the code easier. One may see some checks and a warning when running checkpatch. Those have nothing to do with the rename and will be addressed in a further patch. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-30-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Use bitfield access macrosTudor Ambarus
Use the bitfield access macros in order to clean and to make the driver easier to read. One will see some "line length exceeds 100 columns" checkpatch warnings. I chose to not introduce new lines for regs descriptions in order to preserve the style of the comments throughout the definitions. Style can be fixed in a further patch. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-29-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Keep register definitions and structures private to ↵Tudor Ambarus
at_hdmac.c Do not expose register definitions, structures and helpers via a .h file because there are used only by at_hdmac.c. Since there are no other users, remove the ambiguity and move all the .h contents to the .c file. One may notice some checkpatch warnings and errors with this move. The move was done "as it was", checkpatch complaints can be fixed in a further patch. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-28-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Set include entries in alphabetic orderTudor Ambarus
It's a good practice to set the include entries in alphabetic order. It helps humans to read the code easier. Alphabetic order should also prove that each header is self-contained, i.e. can be included without prerequisites. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-27-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Use pm_ptr()Tudor Ambarus
Use pm_ptr() macro to fill at_dma_driver.driver.pm. In case CONFIG_PM is not enabled, the macro will return NULL. When NULL, at_dma_dev_pm_ops will end up being unused, so prepend it with the __maybe_unused attribute. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-26-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Use devm_clk_get()Tudor Ambarus
Clocks that are get with this method will be automatically put on driver detach. Use devm_clk_get() and simplify the error handling. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-25-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Use devm_platform_ioremap_resourceTudor Ambarus
Use devm_platform_ioremap_resource() helper for cleanner code and easier resource management. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-24-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Use devm_kzalloc() and struct_size()Tudor Ambarus
Use the resource-managed kzalloc to simplify error logic. Memory allocated with this function is automatically freed on driver detach. Use struct_size() helper to calculate the size of the atdma structure with its trailing flexible array. While here, move the mem allocation higher in the probe method, as failing to allocate memory indicates a serious system issue, and everything else does not matter anyway. All these help the code look a bit cleaner. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-23-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Introduce atc_get_llis_residue()Tudor Ambarus
Introduce a method to get the residue for a hardware linked list transfer. It makes the code easier to read. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-22-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: s/atc_get_bytes_left/atc_get_residueTudor Ambarus
Use dmaengine terminology and rename the method to better indicate what it does: it gets the residue value which will be later on set with dma_set_residue(). Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-21-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Pass residue by address to avoid unnecessary implicit castsTudor Ambarus
struct dma_tx_state defines residue as u32. atc_get_bytes_left() returned an int which could be either an error or the value of the residue. This could cause problems if the controller supported a u32 buffer transfer size and the u32 value was past the max int can hold. Our controller does not support u32 buffer transfer size, but even so, improve the code and pass the residue by address to avoid unnecessary implicit casts and make atc_get_bytes_left() return 0 on success or -errno on errors. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-20-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Remove superfluous castTudor Ambarus
Conversions of void * are applied automatically when other pointer types are assigned to and from void *. Remove the superfluous cast. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-19-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Return dma_cookie_status()'s ret code when txstate is NULLTudor Ambarus
txstate is an optional parameter used to get a struct with auxilary transfer status information. When not provided the call to device_tx_status() should return the status of the dma cookie. Return the status of dma cookie when the txstate optional parameter is not provided. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-18-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-11dmaengine: at_hdmac: Do not print messages on console while holding the lockTudor Ambarus
The descriptor was already removed from the transfer list, there's no reason to keep the channel lock while printing desc info, thus do the prints without holding the lock. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-17-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Check return code of dma_async_device_registerTudor Ambarus
dma_async_device_register() can fail, check the return code and display an error. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-16-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix impossible conditionTudor Ambarus
The iterator can not be greater than ATC_MAX_DSCR_TRIALS, as the for loop will stop when i == ATC_MAX_DSCR_TRIALS. While here, use the common "i" name for the iterator. Fixes: 93dce3a6434f ("dmaengine: at_hdmac: fix residue computation") Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-15-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Don't allow CPU to reorder channel enableTudor Ambarus
at_hdmac uses __raw_writel for register writes. In the absence of a barrier, the CPU may reorder the register operations. Introduce a write memory barrier so that the CPU does not reorder the channel enable, thus the start of the transfer, without making sure that all the pre-required register fields are already written. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-14-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix completion of unissued descriptor in case of errorsTudor Ambarus
In case the controller detected an error, the code took the chance to move all the queued (submitted) descriptors to the active (issued) list. This was wrong as if there were any descriptors in the submitted list they were moved to the issued list without actually issuing them to the controller, thus a completion could be raised without even fireing the descriptor. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-13-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix descriptor handling when issuing it to hardwareTudor Ambarus
As it was before, the descriptor was issued to the hardware without adding it to the active (issued) list. This could result in a completion of other descriptor, or/and in the descriptor never being completed. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-12-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix concurrency over the active listTudor Ambarus
The tasklet (atc_advance_work()) did not held the channel lock when retrieving the first active descriptor, causing concurrency problems if issue_pending() was called in between. If issue_pending() was called exactly after the lock was released in the tasklet (atc_advance_work()), atc_chain_complete() could complete a descriptor for which the controller has not yet raised an interrupt. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-11-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Free the memset buf without holding the chan lockTudor Ambarus
There's no need to hold the channel lock when freeing the memset buf, as the operation has already completed. Free the memset buf without holding the channel lock. Fixes: 4d112426c344 ("dmaengine: hdmac: Add memset capabilities") Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-10-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix concurrency over descriptorTudor Ambarus
The descriptor was added to the free_list before calling the callback, which could result in reissuing of the same descriptor and calling of a single callback for both. Move the decriptor to the free list after the callback is invoked. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-9-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix concurrency problems by removing atc_complete_all()Tudor Ambarus
atc_complete_all() had concurrency bugs, thus remove it: 1/ atc_complete_all() in its entirety was buggy, as when the atchan->queue list (the one that contains descriptors that are not yet issued to the hardware) contained descriptors, it fired just the first from the atchan->queue, but moved all the desc from atchan->queue to atchan->active_list and considered them all as fired. This could result in calling the completion of a descriptor that was not yet issued to the hardware. 2/ when in tasklet at atc_advance_work() time, atchan->active_list was queried without holding the lock of the chan. This can result in atchan->active_list concurrency problems between the tasklet and issue_pending(). Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-8-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Protect atchan->status with the channel lockTudor Ambarus
Now that the complete callback call was removed from device_terminate_all(), we can protect the atchan->status with the channel lock. The atomic bitops on atchan->status do not substitute proper locking on the status, as one could still modify the status after the lock was dropped in atc_terminate_all() but before the atomic bitops were executed. Fixes: 078a6506141a ("dmaengine: at_hdmac: Fix deadlocks") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-7-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Do not call the complete callback on device_terminate_allTudor Ambarus
The method was wrong because it violated the dmaengine API. For aborted transfers the complete callback should not be called. Fix the behavior and do not call the complete callback on device_terminate_all. Fixes: 808347f6a317 ("dmaengine: at_hdmac: add DMA slave transfers") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-6-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Fix premature completion of desc in issue_pendingTudor Ambarus
Multiple calls to atc_issue_pending() could result in a premature completion of a descriptor from the atchan->active list, as the method always completed the first active descriptor from the list. Instead, issue_pending() should just take the first transaction descriptor from the pending queue, move it to active_list and start the transfer. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-5-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Start transfer for cyclic channels in issue_pendingTudor Ambarus
Cyclic channels must too call issue_pending in order to start a transfer. Start the transfer in issue_pending regardless of the type of channel. This wrongly worked before, because in the past the transfer was started at tx_submit level when only a desc in the transfer list. Fixes: 53830cc75974 ("dmaengine: at_hdmac: add cyclic DMA operation support") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-4-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-11-08dmaengine: at_hdmac: Don't start transactions at tx_submit levelTudor Ambarus
tx_submit is supposed to push the current transaction descriptor to a pending queue, waiting for issue_pending() to be called. issue_pending() must start the transfer, not tx_submit(), thus remove atc_dostart() from atc_tx_submit(). Clients of at_xdmac that assume that tx_submit() starts the transfer must be updated and call dma_async_issue_pending() if they miss to call it. The vdbg print was moved to after the lock is released. It is desirable to do the prints without the lock held if possible, and because the if statement disappears there's no reason why to do the print while holding the lock. Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Reported-by: Peter Rosin <peda@axentia.se> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/ Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-3-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-04-20dmaengine: at_hdmac: In atc_prep_dma_memset, treat value as a single byteBen Walker
The value passed in to .prep_dma_memset is to be treated as a single byte repeating pattern. Signed-off-by: Ben Walker <benjamin.walker@intel.com> Cc: Ludovic Desroches <ludovic.desroches@microchip.com> Cc: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20220301182551.883474-3-benjamin.walker@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-01-08dmaengine: at_hdmac: remove platform data headerAlexandre Belloni
linux/platform_data/dma-atmel.h is only used by the at_hdmac driver. Move the CFG bits definitions back in at_hdmac_regs.h and the remaining definitions in the driver. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20201228203022.2674133-1-alexandre.belloni@bootlin.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-09-18dmaengine: at_hdmac: convert tasklets to use new tasklet_setup() APIAllen Pais
In preparation for unconditionally passing the struct tasklet_struct pointer to all tasklet callbacks, switch to using the new tasklet_setup() and from_tasklet() to pass the tasklet pointer explicitly. Signed-off-by: Romain Perier <romain.perier@gmail.com> Signed-off-by: Allen Pais <allen.lkml@gmail.com> Link: https://lore.kernel.org/r/20200831103542.305571-3-allen.lkml@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-08-19dmaengine: at_hdmac: add missing kfree() call in at_dma_xlate()Yu Kuai
If memory allocation for 'atslave' succeed, at_dma_xlate() doesn't have a corresponding kfree() in exception handling. Thus add kfree() for this function implementation. Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20200817115728.1706719-4-yukuai3@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-08-19dmaengine: at_hdmac: add missing put_device() call in at_dma_xlate()Yu Kuai
If of_find_device_by_node() succeed, at_dma_xlate() doesn't have a corresponding put_device(). Thus add put_device() to fix the exception handling for this function implementation. Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20200817115728.1706719-3-yukuai3@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-08-19dmaengine: at_hdmac: check return value of of_find_device_by_node() in ↵Yu Kuai
at_dma_xlate() The reurn value of of_find_device_by_node() is not checked, thus null pointer dereference will be triggered if of_find_device_by_node() failed. Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20200817115728.1706719-2-yukuai3@huawei.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-07-15dmaengine: at_hdmac: Repair parameter misspelling and demote non-kerneldoc ↵Lee Jones
headers Fixes the following W=1 kernel build warning(s): drivers/dma/at_hdmac.c:666: warning: Function parameter or member 'tx' not described in 'atc_tx_submit' drivers/dma/at_hdmac.c:666: warning: Excess function parameter 'desc' description in 'atc_tx_submit' drivers/dma/at_hdmac.c:1206: warning: Function parameter or member 'reg_width' not described in 'atc_dma_cyclic_check_values' drivers/dma/at_hdmac.c:1206: warning: Function parameter or member 'buf_addr' not described in 'atc_dma_cyclic_check_values' drivers/dma/at_hdmac.c:1206: warning: Function parameter or member 'period_len' not described in 'atc_dma_cyclic_check_values' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'chan' not described in 'atc_dma_cyclic_fill_desc' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'desc' not described in 'atc_dma_cyclic_fill_desc' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'period_index' not described in 'atc_dma_cyclic_fill_desc' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'buf_addr' not described in 'atc_dma_cyclic_fill_desc' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'reg_width' not described in 'atc_dma_cyclic_fill_desc' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'period_len' not described in 'atc_dma_cyclic_fill_desc' drivers/dma/at_hdmac.c:1228: warning: Function parameter or member 'direction' not described in 'atc_dma_cyclic_fill_desc' Signed-off-by: Lee Jones <lee.jones@linaro.org> Cc: Ludovic Desroches <ludovic.desroches@microchip.com> Cc: Nicolas Ferre <nicolas.ferre@atmel.com> Link: https://lore.kernel.org/r/20200714111546.1755231-9-lee.jones@linaro.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: at_hdmac: Fix deadlocksTudor Ambarus
Fix the following deadlocks: 1/ atc_handle_cyclic() and atc_chain_complete() called dmaengine_desc_get_callback_invoke() while wrongly holding the atchan->lock. Clients can set the callback to dmaengine_terminate_sync() which will end up trying to get the same lock, thus a deadlock occurred. 2/ dma_run_dependencies() was called with the atchan->lock held, but the method calls device_issue_pending() which tries to get the same lock, and so a deadlock occurred. The driver must not hold the lock when invoking the callback or when running dependencies. Releasing the spinlock within a called function before calling the callback is not a nice thing to do -> called functions become non-atomic when called within an atomic region. Thus the lock is now taken in the child routines whereever is needed. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-6-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: at_hdmac: Switch atomic allocations to GFP_NOWAITTudor Ambarus
Avoids sleeping without depleting the emergency pool. The rationale being that in most cases a dma device is either offloading an operation that will automatically fallback to software when the descriptor allocation fails, or we can simply poll and wait for the dma device to release some in use descriptors. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-5-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: at_hdmac: Drop description for a not defined parameterTudor Ambarus
Probably a leftover, drop it. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-4-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: at_hdmac: Return err in case the chan is not free at alloc res timeTudor Ambarus
Having a list of descriptors allocated for the channel at device_alloc_chan_resources() time is a sign for bad free usage. Return err and add a debug message in case the channel is not free from a previous use. atchan->descs_allocated becomes useless, get rid of it. More, drop the error message in atc_desc_get() because now it would introduce an extra if statement. The callers of atc_desc_get() already print error messages in case the callee fails, no one is hurt. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-3-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: at_hdmac: Drop locking in at_hdmac_alloc_chan_resources()Tudor Ambarus
There is no need for locking in device_alloc_chan_resources(), the DMA core takes care of it by using a dma_list_mutex around the DMA devices. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-2-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-02-25dmaengine: at_hdmac: Substitute kzalloc with kmallocTudor Ambarus
All members of the structure are initialized below in the function, there is no need to use kzalloc. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-1-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-07dmaengine: at_hdmac: drop useless LIST_HEADJulia Lawall
Drop LIST_HEAD where the variable it declares is never used. tmp_list has been declared since the introduction of the driver and has never been used. The two declarations of list were introduced with the containing functions but were also not used. The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier x; @@ - LIST_HEAD(x); ... when != x // </smpl> Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller") Fixes: 4facfe7f09f2b ("dmaengine: hdmac: Split device_control") Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-11-29dmaengine: at_hdmac: fix module unloadingRichard Genoud
of_dma_controller_free() was not called on module onloading. This lead to a soft lockup: watchdog: BUG: soft lockup - CPU#0 stuck for 23s! Modules linked in: at_hdmac [last unloaded: at_hdmac] when of_dma_request_slave_channel() tried to call ofdma->of_dma_xlate(). Cc: stable@vger.kernel.org Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding") Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Richard Genoud <richard.genoud@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-11-29dmaengine: at_hdmac: fix memory leak in at_dma_xlate()Richard Genoud
The leak was found when opening/closing a serial port a great number of time, increasing kmalloc-32 in slabinfo. Each time the port was opened, dma_request_slave_channel() was called. Then, in at_dma_xlate(), atslave was allocated with devm_kzalloc() and never freed. (Well, it was free at module unload, but that's not what we want). So, here, kzalloc is more suited for the job since it has to be freed in atc_free_chan_resources(). Cc: stable@vger.kernel.org Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding") Reported-by: Mario Forner <m.forner@be4energy.com> Suggested-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Richard Genoud <richard.genoud@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-10-07dmaengine: at_hdmac: remove dma_slave_config direction usageVinod Koul
dma_slave_config direction was marked as deprecated quite some time back, remove the usage from this driver so that the field can be removed Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-04-22dmaengine: at_hdmac: simplify getting .drvdataWolfram Sang
We should get drvdata from struct device directly. Going via platform_device is an unneeded step back and forth. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
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