linux-kernel - Re: [PATCH v4 0/3] Add SSIF BMC driver

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Message-ID: <f7dd5b0f-a2a7-0a5f-3521-6721e8e52cb5@os.amperecomputing.com>
Date:   Wed, 14 Jul 2021 06:29:27 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     minyard@....org
Cc:     Rob Herring <robh+dt@...nel.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Wolfram Sang <wsa@...nel.org>,
        openipmi-developer@...ts.sourceforge.net,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v4 0/3] Add SSIF BMC driver

On 13/07/2021 22:44, Corey Minyard wrote:
> On Tue, Jul 13, 2021 at 12:54:22PM +0700, Quan Nguyen wrote:
>> This series add support the SSIF BMC driver which is to perform in-band
>> IPMI communication with their host in management (BMC) side.
> 
> Per the kernel build robot, looks like patch 3 introduces slave_enable()
> but patch 1 uses it.
> 
> -corey
> 
Thanks Corey,

The order is not correct and kernel build robot found this hurts 
bisectibility.
The patch 3 should be the first patch.

- Quan

>>
>> SSIF BMC driver in this series is tested with Aspeed AST2500.
>>
>> v4:
>>    + Fix recursive spinlock                                      [Graeme]
>>    + Send response with Completion code 0xFF when aborting         [Quan]
>>    + Fix warning with dt_binding_check                              [Rob]
>>    + Change aspeed-ssif-bmc.yaml to ssif-bmc.yaml                  [Quan]
>>    + Added bounding check on SMBus writes and the whole request     [Dan]
>>    + Moved buffer to end of struct ssif_bmc_ctx to avoid context
>>      corruption if somehow buffer is written past the end           [Dan]
>>    + Return -EINVAL if userspace buffer too small, dont
>>      silence truncate                                       [Corey, Joel]
>>    + Not necessary to check NONBLOCK in lock                      [Corey]
>>    + Enforce one user at a time                                    [Joel]
>>    + Reject write with invalid response length from userspace     [Corey]
>>    + Add state machines for better ssif bmc state handling         [Quan]
>>    + Drop ssif_bmc_aspeed.c and make ssif_bmc.c is generic
>>      SSIF BMC driver                                               [Quan]
>>    + Change compatible string "aspeed,ast2500-ssif-bmc" to
>>      "ampere,ssif-bmc"                                             [Quan]
>>    + Toggle Slave enable in i2c-aspeed to turn on/off slave mode   [Ryan]
>>    + Added slave_enable() to struct i2c_algorithm to control
>>      slave mode and to address the recursive spinlock      [Graeme, Ryan]
>>    + Abort current request with invalid SMBus write or
>>      invalid command                                               [Quan]
>>    + Abort all request if there is pending response                [Quan]
>>    + Changed validate_pec() to validate_request()                  [Quan]
>>    + Add unsupported_smbus_cmd() to handle unknown SMBus command   [Quan]
>>    + Print internal state string for ease investigating issue      [Quan]
>>    + Move to READY state on SLAVE_STOP event                       [Quan]
>>    + Change initilize_transfer() to process_smbus_cmd()            [Quan]
>>    + Introduce functions for each slave event                      [Quan]
>>
>> v3:
>>    + Switched binding doc to use DT schema format [Rob]
>>    + Splited into generic ssif_bmc and aspeed-specific [Corey, Joel]
>>    + Removed redundant license info [Joel]
>>    + Switched to use traditional if-else [Joel]
>>    + Removed unused ssif_bmc_ioctl() [Joel]
>>    + Made handle_request()/complete_response() to return void [Joel]
>>    + Refactored send_ssif_bmc_response()/receive_ssif_bmc_request()
>>    [Corey]
>>    + Remove mutex [Corey]
>>    + Use spin_lock/unlock_irqsave/restore in callback [Corey]
>>    + Removed the unnecessary memset [Corey]
>>    + Switch to use dev_err() [Corey]
>>    + Combine mask/unmask two interrupts together [Corey]
>>    + Fixed unhandled Tx done with NAK [Quan]
>>    + Late ack'ed Tx done w/wo Ack irq [Quan]
>>    + Use aspeed-specific exported aspeed_set_slave_busy() when slave busy
>>    to fix the deadlock [Graeme, Philipp, Quan]
>>    + Clean buffer for last multipart read [Quan]
>>    + Handle unknown incoming command [Quan]
>>
>> v2:
>>    + Fixed compiling error with COMPILE_TEST for arc
>>
>> Quan Nguyen (3):
>>    ipmi: ssif_bmc: Add SSIF BMC driver
>>    bindings: ipmi: Add binding for SSIF BMC driver
>>    i2c: aspeed: Add slave_enable() to toggle slave mode
>>
>>   .../devicetree/bindings/ipmi/ssif-bmc.yaml    |  38 +
>>   drivers/char/ipmi/Kconfig                     |  11 +
>>   drivers/char/ipmi/Makefile                    |   1 +
>>   drivers/char/ipmi/ssif_bmc.c                  | 781 ++++++++++++++++++
>>   drivers/char/ipmi/ssif_bmc.h                  | 106 +++
>>   drivers/i2c/busses/i2c-aspeed.c               |  20 +
>>   include/linux/i2c.h                           |   2 +
>>   7 files changed, 959 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/ipmi/ssif-bmc.yaml
>>   create mode 100644 drivers/char/ipmi/ssif_bmc.c
>>   create mode 100644 drivers/char/ipmi/ssif_bmc.h
>>
>> -- 
>> 2.28.0
>>