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

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Message-ID: <20210713154405.GB3406@minyard.net>
Date:   Tue, 13 Jul 2021 10:44:05 -0500
From:   Corey Minyard <minyard@....org>
To:     Quan Nguyen <quan@...amperecomputing.com>
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 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

> 
> 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
>