Date:   Tue, 7 Jun 2022 22:53:55 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Russ Weight <russell.h.weight@...el.com>
Cc:     mdf@...nel.org, hao.wu@...el.com, lee.jones@...aro.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        trix@...hat.com, marpagan@...hat.com, lgoncalv@...hat.com,
        matthew.gerlach@...ux.intel.com,
        basheer.ahmed.muddebihal@...el.com, tianfei.zhang@...el.com
Subject: Re: [PATCH v23 0/5] FPGA MAX10 BMC Secure Update Driver

On Mon, Jun 06, 2022 at 09:00:33AM -0700, Russ Weight wrote:
> The MAX10 BMC Secure Update driver instantiates the new Firmware
> Upload functionality of the Firmware Loader and provides the callback
> functions required to support secure updates on Intel n3000 PAC
> devices.  This driver is implemented as a sub-driver of the Intel MAX10
> BMC mfd driver.
> 
> This driver interacts with the HW secure update engine of the FPGA
> card BMC in order to transfer new FPGA and BMC images to FLASH on
> the FPGA card.  Security is enforced by hardware and firmware.  The
> FPGA Card BMC Secure Update driver interacts with the firmware to
> initiate an update, pass in the necessary data, and collect status
> on the update.
> 
> This driver provides sysfs files for displaying the flash count, the
> root entry hashes (REH), and the code-signing-key (CSK) cancellation
> vectors.
> 
> Changelog v22 -> v23:
>   - Rebased for 5.19-rc1
>   - Added Acked-by tag from Yilun for patch #5
> 
> Changelog v21 -> v22:
>   - Added Tested-by tags from Tianfei and Acked-by tags from Yilun.
>   - Updated KernelVersion and Date in ABI documentation to 5.20 and
>     Sep 2022 respectively.
>   - Removed unnecessary alignment check for source address from
>     m10bmc_sec_prepare().
>   - Changed the handling of a misaligned blk_size in m10bmc_sec_write().
>     Instead of allocating an aligned buffer and copying the block, copy
>     the misaligned bytes into an unsigned int and write with
>     regmap_write().
> 
> Changelog v20 -> v21:
>   - Replace WARN_ON() calls in flash_count_show() and show_canceled_csk()
>     with a more elaborate test. Return -EINVAL and write a message to the
>     kernel log. Call WARN_ON_ONCE().
>   - Update m10bmc_sec_prepare() to ensure that the base address for an
>     update image is aligned with stride.
>   - Update m10bmc_sec_write() to handle a block size that is not aligned
>     with stride by allocating a zero-filled block that is aligned, and
>     copying the data before calling regmap_bulk_write().
> 
> Changelog v19 -> v20:
>   - Added text to commit messages to describe Root Entry Hashes (REH) and
>     Code Signing Key (CSK) cancellation.
>   - Use reverse christmas tree format for local variable declarations in
>     show_root_entry_hash().
>   - Remove WARN_ON() from show_root_entry_hash() and return -EINVAL if 
>     sha_num_bytes is not a multiple of stride.
>   - Move MODULE_DEVICE_TABLE() macro to just beneath the definition of
>     intel_m10bmc_sec_ids[].
> 
> Changelog v18 -> v19:
>   - Change "card bmc" naming back to "m10 bmc" naming to be consistent
>     with the parent driver.
> 
> Changelog v17 -> v18:
>   - Changed the ABI documentation for the Root Entry Hashes to specify
>     string as the format for the output.
>   - Updated comments, strings and config options to more consistently
>     refer to the driver as the Intel FPGA Card BMC Secure Update driver.
>   - Removed an instance of dev_dbg().
>   - Deferred the call to firmware_upload_register() to a later patch
>     where the required ops are provided.
>   - Switched from MODULE_ALIAS() to MODULE_DEVICE_TABLE() in anticipation
>     of additional cards to be supported by the same driver.
> 
> Changelog v16 -> v17:
>   - Change m10bmc to cardbmc to reflect the fact that the future devices
>     will not necessarily use the MAX10. This affects filenames, configs,
>     symbol names, and the driver name.
>   - Update the Date and KernelVersion for the ABI documentation to Jul 2022
>     and 5.19 respectively.
>   - Updated the copyright end-date to 2022 for the secure update driver.
>   - Removed references to the FPGA Image Load class driver and replaced
>     them with the new firmware-upload service from the firmware loader.
>   - Use xarray_alloc to generate a unique number/name firmware-upload.
>   - Chang the license from GPL to GPLv2 per commit bf7fbeeae6db ("module:
>     Cure the MODULE_LICENSE "GPL" vs. "GPL v2" bogosity")
>   - fw_upload_ops functions will return "enum fw_upload_err" data types
>     instead of integer values.
> 
> Changelog v15 -> v16:
>   - Use 0 instead of FPGA_IMAGE_ERR_NONE to indicate success.
>   - The size alignment check was moved from the FPGA Image Load framework
>     to the prepare() op.
>   - Added cancel_request boolean flag to struct m10bmc_sec.
>   - Moved the RSU cancellation logic from m10bmc_sec_cancel() to a new
>     rsu_cancel() function.
>   - The m10bmc_sec_cancel() function ONLY sets the cancel_request flag.
>     The cancel_request flag is checked at the beginning of the
>     m10bmc_sec_write() and m10bmc_sec_poll_complete() functions.
>   - Adapt to changed prototypes for the prepare() and write() ops. The
>     m10bmc_sec_write_blk() function has been renamed to
>     m10bmc_sec_write().
>   - Created a cleanup op, m10bmc_sec_cleanup(), to attempt to cancel an
>     ongoing op during when exiting the update process.
> 
> Changelog v14 -> v15:
>   - Updated the Dates and KernelVersions in the ABI documentation
>   - Change driver name from "n3000bmc-secure" to "n3000bmc-sec-update".
>   - Change CONFIG_FPGA_M10_BMC_SECURE to CONFIG_FPGA_M10_BMC_SEC_UPDATE.
>   - Change instances of *bmc-secure to *bmc-sec-update in file name
>     and symbol names.
>   - Change instances of *m10bmc_secure* to *m10bmc-sec_update* in symbol
>     names.
>   - Adapted to changes in the FPGA Image Load framework:
>     (1) All enum types (progress and errors) are now type u32
>     (2) m10bmc_sec_write_blk() adds *blk_size and max_size parameters
>         and uses *blk_size as provided by the caller.
>     (3) m10bmc_sec_poll_complete() no long checks the driver_unload
>         flag.
> 
> Changelog v13 -> v14:
>   - Changed symbol and text references to reflect the renaming of the
>     Security Manager Class driver to FPGA Image Load.
> 
> Changelog v12 -> v13:
>   - Updated copyright to 2021
>   - Updated Date and KernelVersion fields in ABI documentation
>   - Call updated fpga_sec_mgr_register() and fpga_sec_mgr_unregister()
>     functions instead of devm_fpga_sec_mgr_create() and
>     devm_fpga_sec_mgr_register().
> 
> Changelog v11 -> v12:
>   - Updated Date and KernelVersion fields in ABI documentation
>   - Removed size parameter from the write_blk() op. m10bmc_sec_write_blk()
>     no longer has a size parameter, and the block size is determined
>     in this (the lower-level) driver.
> 
> Changelog v10 -> v11:
>   - Added Reviewed-by tag to patch #1
> 
> Changelog v9 -> v10:
>   - Changed the path expressions in the sysfs documentation to
>     replace the n3000 reference with something more generic to
>     accommodate other devices that use the same driver.
> 
> Changelog v8 -> v9:
>   - Rebased to 5.12-rc2 next
>   - Updated Date and KernelVersion in ABI documentation
> 
> Changelog v7 -> v8:
>   - Split out patch "mfd: intel-m10-bmc: support for MAX10 BMC Secure
>     Updates" and submitted it separately:
>     https://marc.info/?l=linux-kernel&m=161126987101096&w=2
> 
> Changelog v6 -> v7:
>   - Rebased patches for 5.11-rc2
>   - Updated Date and KernelVersion in ABI documentation
> 
> Changelog v5 -> v6:
>   - Added WARN_ON() prior to several calls to regmap_bulk_read()
>     to assert that the (SIZE / stride) calculations did not result
>     in remainders.
>   - Changed the (size / stride) calculation in regmap_bulk_write()
>     call to ensure that we don't write one less than intended.
>   - Changed flash_count_show() parameter list to achieve
>     reverse-christmas tree format.
>   - Removed unnecessary call to rsu_check_complete() in
>     m10bmc_sec_poll_complete() and changed while loop to
>     do/while loop.
>   - Initialized auth_result and doorbell to HW_ERRINFO_POISON
>     in m10bmc_sec_hw_errinfo() and removed unnecessary if statements.
> 
> Changelog v4 -> v5:
>   - Renamed sysfs node user_flash_count to flash_count and updated
>     the sysfs documentation accordingly to more accurately descirbe
>     the purpose of the count.
> 
> Changelog v3 -> v4:
>   - Moved sysfs files for displaying the flash count, the root
>     entry hashes (REH), and the code-signing-key (CSK) cancellation
>     vectors from the FPGA Security Manager class driver to this
>     driver (as they are not generic enough for the class driver).
>   - Added a new ABI documentation file with informtaion about the
>     new sysfs entries: sysfs-driver-intel-m10-bmc-secure
>   - Updated the MAINTAINERS file to add the new ABI documentation
>     file: sysfs-driver-intel-m10-bmc-secure
>   - Removed unnecessary ret variable from m10bmc_secure_probe()
>   - Incorporated new devm_fpga_sec_mgr_register() function into
>     m10bmc_secure_probe() and removed the m10bmc_secure_remove()
>     function.
> 
> Changelog v2 -> v3:
>   - Changed "MAX10 BMC Security Engine driver" to "MAX10 BMC Secure
>     Update driver"
>   - Changed from "Intel FPGA Security Manager" to FPGA Security Manager"
>   - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_
>   - Removed wrapper functions (m10bmc_raw_*, m10bmc_sys_*). The
>     underlying functions are now called directly.
>   - Changed "_root_entry_hash" to "_reh", with a comment explaining
>     what reh is.
>   - Renamed get_csk_vector() to m10bmc_csk_vector()
>   - Changed calling functions of functions that return "enum fpga_sec_err"
>     to check for (ret != FPGA_SEC_ERR_NONE) instead of (ret)
> 
> Changelog v1 -> v2:
>   - These patches were previously submitted as part of a larger V1
>     patch set under the title "Intel FPGA Security Manager Class Driver".
>   - Grouped all changes to include/linux/mfd/intel-m10-bmc.h into a
>     single patch: "mfd: intel-m10-bmc: support for MAX10 BMC Security
>     Engine".
>   - Removed ifpga_sec_mgr_init() and ifpga_sec_mgr_uinit() functions.
>   - Adapted to changes in the Intel FPGA Security Manager by splitting
>     the single call to ifpga_sec_mgr_register() into two function
>     calls: devm_ifpga_sec_mgr_create() and ifpga_sec_mgr_register().
>   - Replaced small function-creation macros for explicit function
>     declarations.
>   - Bug fix for the get_csk_vector() function to properly apply the
>     stride variable in calls to m10bmc_raw_bulk_read().
>   - Added m10bmc_ prefix to functions in m10bmc_iops structure
>   - Implemented HW_ERRINFO_POISON for m10bmc_sec_hw_errinfo() to
>     ensure that corresponding bits are set to 1 if we are unable
>     to read the doorbell or auth_result registers.
>   - Added comments and additional code cleanup per V1 review.
> 
> Russ Weight (5):
>   mfd: intel-m10-bmc: Rename n3000bmc-secure driver
>   fpga: m10bmc-sec: create max10 bmc secure update
>   fpga: m10bmc-sec: expose max10 flash update count
>   fpga: m10bmc-sec: expose max10 canceled keys in sysfs
>   fpga: m10bmc-sec: add max10 secure update functions
> 
>  .../sysfs-driver-intel-m10-bmc-sec-update     |  61 ++
>  MAINTAINERS                                   |   7 +
>  drivers/fpga/Kconfig                          |  12 +
>  drivers/fpga/Makefile                         |   3 +
>  drivers/fpga/intel-m10-bmc-sec-update.c       | 625 ++++++++++++++++++
>  drivers/mfd/intel-m10-bmc.c                   |   2 +-
>  6 files changed, 709 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-sec-update
>  create mode 100644 drivers/fpga/intel-m10-bmc-sec-update.c
> 
> 
> base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56

Applied to for-next

> -- 
> 2.25.1

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