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Date: Tue, 6 Apr 2021 22:48:05 +0530
From: Sanjay R Mehta <sanmehta@....com>
To: Sanjay R Mehta <Sanju.Mehta@....com>, vkoul@...nel.org
Cc: gregkh@...uxfoundation.org, dan.j.williams@...el.com,
Thomas.Lendacky@....com, Shyam-sundar.S-k@....com,
Nehal-bakulchandra.Shah@....com, robh@...nel.org,
mchehab+samsung@...nel.org, davem@...emloft.net,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v8 0/3] Add support for AMD PTDMA controller driver
On 3/22/2021 10:29 AM, Sanjay R Mehta wrote:
> From: Sanjay R Mehta <sanju.mehta@....com>
>
> This patch series add support for AMD PTDMA controller which
> performs high bandwidth memory-to-memory and IO copy operation,
> performs DMA transfer through queue based descriptor management.
>
> AMD Processor has multiple ptdma device instances with each controller
> having single queue. The driver also adds support for for multiple PTDMA
> instances, each device will get an unique identifier and uniquely
> named resources.
>
> v8:
> - splitted the code into different functions, one to find active desc
> and second to complete and invoke callback.
> - used FIELD_PREP & FIELD_GET instead of union struct bitfields.
> - modified all style fixes as per the comments.
>
> v7:
> - Fixed module warnings reported ( by kernel test robot <lkp@...el.com> ).
>
> v6:
> - Removed debug artifacts and made the suggested cosmetic changes.
> - implemented and used to_pt_chan and to_pt_desc inline functions.
> - Removed src and dst address check as framework does this.
> - Removed devm_kcalloc() usage and used devm_kzalloc() api.
> - Using framework debugfs directory to store dma info.
>
> v5:
> - modified code to submit next tranction in ISR itself and removed the tasklet.
> - implemented .device_synchronize API.
> - converted debugfs code by using DEFINE_SHOW_ATTRIBUTE()
> - using dbg_dev_root for debugfs root directory.
> - removed dma_status from pt_dma_chan
> - removed module parameter cmd_queue_lenght.
> - removed global device list for multiple devics.
> - removed code related to dynamic adding/deleting to device list
> - removed pt_add_device and pt_del_device functions
>
> v4:
> - modified DMA channel and descriptor management using virt-dma layer
> instead of list based management.
> - return only status of the cookie from pt_tx_status
> - copyright year changed from 2019 to 2020
> - removed dummy code for suspend & resume
> - used bitmask and genmask
>
> v3:
> - Fixed the sparse warnings.
>
> v2:
> - Added controller description in cover letter
> - Removed "default m" from Kconfig
> - Replaced low_address() and high_address() functions with kernel
> API's lower_32_bits & upper_32_bits().
> - Removed the BH handler function pt_core_irq_bh() and instead
> handling transaction in irq handler itself.
> - Moved presetting of command queue registers into new function
> "init_cmdq_regs()"
> - Removed the kernel thread dependency to submit transaction.
> - Increased the hardware command queue size to 32 and adding it
> as a module parameter.
> - Removed backlog command queue handling mechanism.
> - Removed software command queue handling and instead submitting
> transaction command directly to
> hardware command queue.
> - Added tasklet structure variable in "struct pt_device".
> This is used to invoke pt_do_cmd_complete() upon receiving interrupt
> for command completion.
> - pt_core_perform_passthru() function parameters are modified and it is
> now used to submit command directly to hardware from dmaengine framew
> - Removed below structures, enums, macros and functions, as these value
> constants. Making command submission simple,
> - Removed "union pt_function" and several macros like PT_VERSION,
> PT_BYTESWAP, PT_CMD_* etc..
> - enum pt_passthru_bitwise, enum pt_passthru_byteswap, enum pt_memty
> struct pt_dma_info, struct pt_data, struct pt_mem, struct pt_passt
> struct pt_op,
>
> Links of the review comments for v7:
> 1. https://lkml.org/lkml/2020/11/18/351
> 2. https://lkml.org/lkml/2020/11/18/384
>
> Links of the review comments for v5:
> 1. https://lkml.org/lkml/2020/7/3/154
> 2. https://lkml.org/lkml/2020/8/25/431
> 3. https://lkml.org/lkml/2020/7/3/177
> 4. https://lkml.org/lkml/2020/7/3/186
>
> Links of the review comments for v5:
> 1. https://lkml.org/lkml/2020/5/4/42
> 2. https://lkml.org/lkml/2020/5/4/45
> 3. https://lkml.org/lkml/2020/5/4/38
> 4. https://lkml.org/lkml/2020/5/26/70
>
> Links of the review comments for v4:
> 1. https://lkml.org/lkml/2020/1/24/12
> 2. https://lkml.org/lkml/2020/1/24/17
>
> Links of the review comments for v2:
> 1https://lkml.org/lkml/2019/12/27/630
> 2. https://lkml.org/lkml/2020/1/3/23
> 3. https://lkml.org/lkml/2020/1/3/314
> 4. https://lkml.org/lkml/2020/1/10/100
>
> Links of the review comments for v1:
> 1. https://lkml.org/lkml/2019/9/24/490
> 2. https://lkml.org/lkml/2019/9/24/399
> 3. https://lkml.org/lkml/2019/9/24/862
> 4. https://lkml.org/lkml/2019/9/24/122
>
> Sanjay R Mehta (3):
> dmaengine: ptdma: Initial driver for the AMD PTDMA
> dmaengine: ptdma: register PTDMA controller as a DMA resource
> dmaengine: ptdma: Add debugfs entries for PTDMA
>
> MAINTAINERS | 6 +
> drivers/dma/Kconfig | 2 +
> drivers/dma/Makefile | 1 +
> drivers/dma/ptdma/Kconfig | 13 +
> drivers/dma/ptdma/Makefile | 10 +
> drivers/dma/ptdma/ptdma-debugfs.c | 115 +++++++++
> drivers/dma/ptdma/ptdma-dev.c | 327 ++++++++++++++++++++++++
> drivers/dma/ptdma/ptdma-dmaengine.c | 480 ++++++++++++++++++++++++++++++++++++
> drivers/dma/ptdma/ptdma-pci.c | 251 +++++++++++++++++++
> drivers/dma/ptdma/ptdma.h | 342 +++++++++++++++++++++++++
> 10 files changed, 1547 insertions(+)
> create mode 100644 drivers/dma/ptdma/Kconfig
> create mode 100644 drivers/dma/ptdma/Makefile
> create mode 100644 drivers/dma/ptdma/ptdma-debugfs.c
> create mode 100644 drivers/dma/ptdma/ptdma-dev.c
> create mode 100644 drivers/dma/ptdma/ptdma-dmaengine.c
> create mode 100644 drivers/dma/ptdma/ptdma-pci.c
> create mode 100644 drivers/dma/ptdma/ptdma.h
>
Hi Vinod,
Any comments on this patch series?
Thanks,
Sanjay
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