On Tue, Oct 04, 2022 at 04:31:03PM +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. > > SSIF BMC driver in this series is tested with Aspeed AST2500 and AST2600 I have applied the two IPMI patches to the IPMI tree for 6.2. Thanks for sticking with this. -corey > > Discussion for v9: > https://lore.kernel.org/lkml/20220929080326.752907-1-quan@xxxxxxxxxxxxxxxxxxxxxx/ > > v10: > + Issuing RxCmdLast command for all errnos [Wolfram] > > v9: > + Fix dependence with I2C subsystem [Randy] > + Update missing Reviewed-by tag from v7 [Rob] > + Remove useless error handling path [CJ] > + Update comment for SSIF_ABORTING state [CJ] > + Fix "unknown type name --u8" [kernel test robot] > + Update commit message and add comment to explain > the effect of issuing RxCmdLast when Slave busy [Quan] > > v8: > + Dropped ssif_bmc.h file and move its content to ssif_bmc.c [Corey] > + Add struct ipmi_ssif_msg to include/uapi/linux/ipmi_ssif_bmc.h > header file [Corey] > + Use unsigned int for len field in struct ipmi_ssif_msg [Corey] > + Avoid using packed structure [Corey] > + Add comment to clarify the logic flow [Corey] > + Fix multipart read end with len=0 issue [Corey] > + Refactor code handle the too big request message [Corey] > + Fix code indentation issue [Corey] > + Clean buffer before receiving request to avoid garbage [Quan] > + Fix the license to SPDX-License-Identifier: GPL-2.0-only [Quan] > > 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 | 10 + > drivers/char/ipmi/Makefile | 1 + > drivers/char/ipmi/ssif_bmc.c | 873 ++++++++++++++++++ > drivers/i2c/busses/i2c-aspeed.c | 9 +- > include/uapi/linux/ipmi_ssif_bmc.h | 18 + > 6 files changed, 948 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 include/uapi/linux/ipmi_ssif_bmc.h > > -- > 2.35.1 >
