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Message-ID: <b9e0273c-9fa1-b0e7-8737-863a94767654@os.amperecomputing.com>
Date: Fri, 22 Apr 2022 11:16:13 +0700
From: Quan Nguyen <quan@...amperecomputing.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Corey Minyard <minyard@....org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
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, openbmc@...ts.ozlabs.org
Cc: Open Source Submission <patches@...erecomputing.com>,
Phong Vo <phong@...amperecomputing.com>,
"Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v7 0/3] Add SSIF BMC driver
Added Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
as I'm not aware of the email change
- Quan
On 22/04/2022 11:08, 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.
>
> SSIF BMC driver in this series is tested with Aspeed AST2500.
>
> Discussion for v6: https://lkml.org/lkml/2022/3/10/340
>
> v7:
> + Remove unnecessary del_timer() in response_timeout() [Corey]
> + Change compatible string from "ampere,ssif-bmc" to "ssif-bmc" [Jae]
> + Dropped the use of ssif_msg_len() macro, use the len directly [Quan]
> + Solve possible issue if both response timer and ssif_bmc_write()
> occurred at the same time [Corey]
> + Fix wrong return type of ssif_bmc_poll() [kernel robot test]
> + Refactor and introduce ssif_part_buffer struct to replace the
> response_buf to manage each send/receive part of ssif [Quan]
> + Change SSIF_BAD_SMBUS state to SSIF_ABORTING state [Corey]
> + Support abort feature to skip the current bad request/response and
> wait until next new request [Corey]
> + Refactor the PEC calculation to avoid the re-calculate the PEC on
> each I2C_SLAVE_WRITE_RECEIVED event [Quan]
> + Fix the use of error-proned idx [Corey]
> + Defer the test for valid SMBus command until the read/write part
> is determined [Quan]
> + Change/split unsupported_smbus_cmd() to
> supported_[write|read]_cmd() [Corey]
> + Abort the request if somehow its size exceeded 255 bytes [Quan]
>
> v6:
> + Drop the use of slave_enable() [Wolfram]
> + Make i2c-aspeed to issue RxCmdLast command on all
> I2C_SLAVE_WRITE_REQUESTED event to assert NAK when slave busy [Quan]
> + Make i2c slave to return -EBUSY when it's busy [Quan]
> + Drop the aborting feature as return Completion Code 0xFF may stop
> host to retry and make ipmi_ssif.so fails to load [Quan]
> + Add timer to recover slave from busy state when no response [Quan]
> + Clean request/response buffer appropriately [Quan]
> + Add some minor change on error and warning messages [Quan]
>
> v5:
> + Correct the patches order to fix the bisect issue found by
> kernel build robot
>
> 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, don't
> 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() and
> 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: Assert NAK when slave is busy
>
> .../devicetree/bindings/ipmi/ssif-bmc.yaml | 38 +
> drivers/char/ipmi/Kconfig | 11 +
> drivers/char/ipmi/Makefile | 1 +
> drivers/char/ipmi/ssif_bmc.c | 780 ++++++++++++++++++
> drivers/char/ipmi/ssif_bmc.h | 107 +++
> drivers/i2c/busses/i2c-aspeed.c | 5 +-
> 6 files changed, 941 insertions(+), 1 deletion(-)
> 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
>
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