Re: [PATCH v10 0/3] Add support for AMD PTDMA controller driver
From: Sanjay R Mehta
Date: Thu Jul 22 2021 - 10:33:06 EST
On 7/22/2021 7:40 PM, Vinod Koul wrote:
> [CAUTION: External Email]
>
> On 22-07-21, 19:27, Sanjay R Mehta wrote:
>>
>>
>> On 6/20/2021 10:11 PM, Sanjay R Mehta wrote:
>>> From: Sanjay R Mehta <sanju.mehta@xxxxxxx>
>>>
>>> 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.
>>>
>>> v10:
>>> - modified ISR to return IR_HANDLED only in non-error condition.
>>> - removed unnecessary prints, variables and made some cosmetic changes.
>>> - removed pt_ordinal atomic variable and instead using dev_name()
>>> for device name.
>>> - removed the cmdlist dependency and instead using vc.desc_issued list.
>>> - freeing the desc and list which was missing in the pt_terminate_all()
>>> funtion.
>>> - Added comment for marking PTDMA as DMA_PRIVATE.
>>> - removed unused pt_debugfs_lock from debufs code.
>>> - keeping same file permision for all the debug directoris.
>>>
>>> v9:
>>> - Modified the help message in Kconfig as per Randy's comment.
>>> - reverted the split of code for "pt_handle_active_desc" as there
>>> was driver hang being observerd after few iterations.
>>>
>>> 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@xxxxxxxxx> ).
>>>
>>> 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 v10:
>>> 1. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2021%2F6%2F8%2F976&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082849269%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=WeGA5LwGm9mnQ594VpBPAbUGZXkLZ4oup1T77fJoitc%3D&reserved=0
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>>>
>>> Links of the review comments for v7:
>>> 1. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2020%2F11%2F18%2F351&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082859237%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=0uFWTom212inntZl3C2jmQ0EYVRG8hXlDKDkMdxToAA%3D&reserved=0
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>>>
>>> Links of the review comments for v5:
>>> 1. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2020%2F7%2F3%2F154&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082859237%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=rhXLYx8qk6Uwt7hYiUv8zZFz%2BAekntk5x7%2BF7yrDi%2Fg%3D&reserved=0
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>>>
>>> Links of the review comments for v5:
>>> 1. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2020%2F5%2F4%2F42&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082859237%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=%2FLzrpW49oJQvOojpJcnyEPH6886BfeBdbPnAv8Gzyxk%3D&reserved=0
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>>>
>>> Links of the review comments for v4:
>>> 1. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2020%2F1%2F24%2F12&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082869186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Tox6tf88tSPVA%2Fq5y6ssuNlskxK3cgBpynJTtHEpPOw%3D&reserved=0
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>>>
>>> Links of the review comments for v2:
>>> 1https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2019%2F12%2F27%2F630&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082869186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=lSo%2BPMBxKI5nB%2FWXscbJBUvaCn7n7TfbozKhPhhDviU%3D&reserved=0
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>>>
>>> Links of the review comments for v1:
>>> 1. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2019%2F9%2F24%2F490&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082869186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=MvwpsDwevzgU8Qn3zc29u8hjhFBZIAFZJy7lSYcegnQ%3D&reserved=0
>>> 2. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2019%2F9%2F24%2F399&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082869186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=6v6SMJY%2BY6RfGty9QxG72fsQ%2BV7NfJm%2B8Dh3cVIx%2BtQ%3D&reserved=0
>>> 3. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2019%2F9%2F24%2F862&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082869186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7cY3MBVmXSQ40wVpdVWDDYqTV3Z%2FzCB0j%2ByNeiIO3FA%3D&reserved=0
>>> 4. https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2019%2F9%2F24%2F122&data=04%7C01%7CSanju.Mehta%40amd.com%7C775e5c3c08a24a2a7dc608d94d1a67e3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637625598082869186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=IoLPSuBMdz8T8Qyyknb2%2FJzzV8o62BqzkrQ6kirzOIM%3D&reserved=0
>>>
>>> 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 | 110 ++++++++++
>>> drivers/dma/ptdma/ptdma-dev.c | 327 ++++++++++++++++++++++++++++++
>>> drivers/dma/ptdma/ptdma-dmaengine.c | 389 ++++++++++++++++++++++++++++++++++++
>>> drivers/dma/ptdma/ptdma-pci.c | 245 +++++++++++++++++++++++
>>> drivers/dma/ptdma/ptdma.h | 334 +++++++++++++++++++++++++++++++
>>> 10 files changed, 1437 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, Greg,
>>
>>
>> I had re-sent this patch series as per your advice a month ago with all
>> the review feedback's addressed.
>>
>> Need your guidance and feedback to get this code reviewed and up-streamed.
>
> This was sent during the merge window... and right now this is in my
> review queue and will be addressed shortly.
>
Ok sure. Thank you!
> --
> ~Vinod
>