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* fsi: i2cr: Switch to use struct i2c_driver's .probe()Uwe Kleine-König2023-08-221-1/+1
| | | | | | | | | | | struct i2c_driver::probe_new is about to go away. Switch the driver to use the probe callback with the same prototype. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20230816171944.123705-1-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* fsi: fix some spelling mistakes in commentYu Zhe2023-08-112-3/+3
| | | | | | | | | Fix typos in comment. Signed-off-by: Yu Zhe <yuzhe@nfschina.com> Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Link: https://lore.kernel.org/r/20230203083721.23455-1-yuzhe@nfschina.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: master-ast-cf: Add MODULE_FIRMWARE macroJuerg Haefliger2023-08-111-0/+1
| | | | | | | | | | | The module loads firmware so add a MODULE_FIRMWARE macro to provide that information via modinfo. Fixes: 6a794a27daca ("fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire") Cc: stable@vger.kernel.org # 4.19+ Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com> Link: https://lore.kernel.org/r/20230628095039.26218-1-juerg.haefliger@canonical.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Add I2C Responder SCOM driverEddie James2023-08-113-0/+163
| | | | | | | | | | The I2CR has the capability to directly perform SCOM operations, circumventing the need to drive the FSI2PIB engine. Add a new driver to perform SCOM operations through the I2CR. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-15-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Add IBM I2C Responder virtual FSI masterEddie James2023-08-114-0/+359
| | | | | | | | | | The I2C Responder (I2CR) is an I2C device that translates I2C commands to CFAM or SCOM operations, effectively implementing an FSI master and bus. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-14-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Lock mutex for master device registrationEddie James2023-08-111-5/+5
| | | | | | | | | | Because master device registration may cause hub master scans, or user scans may begin before device registration has ended, so the master scan lock must be held while registering the device. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230809180814.151984-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Improve master indexingEddie James2023-08-111-7/+17
| | | | | | | | | | | | | Master indexing is problematic if a hub is rescanned while the root master is being rescanned. Always allocate an index for the FSI master, and set the device name if it hasn't already been set. Move the call to ida_free to the bottom of master unregistration and set the number of links to 0 in case another call to scan comes in before the device is removed. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230809180814.151984-2-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: core: Switch to ida_alloc/freeEddie James2023-08-091-8/+8
| | | | | | | | ida_simple_get/remove are deprecated, so switch to ida_alloc/free. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-11-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: core: Fix legacy minor numberingEddie James2023-08-091-3/+8
| | | | | | | | | | | The legacy minor numbering shifts the chip id too much, resulting in ids that overlap with regular ids. Since there are only 2 bits for 4 types, only shift the chip id by 2 to fit the legacy ids in their reserved space. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-10-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: core: Add trace events for scan and unregisterEddie James2023-08-091-0/+4
| | | | | | | | | | Add more trace events for the scanning and unregistration functions for debug purposes. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20230612195657.245125-9-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: aspeed: Reset master errors after CFAM resetEddie James2023-08-091-0/+2
| | | | | | | | | | | It has been observed that sometimes the FSI master will return all 0xffs after a CFAM has been taken out of reset, without presenting any error. Resetting the FSI master errors resolves the issue. Fixes: 4a851d714ead ("fsi: aspeed: Support CFAM reset GPIO") Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-8-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: sbefifo: Remove limits on user-specified read timeoutEddie James2023-08-091-7/+2
| | | | | | | | | There's no reason to limit the user here. The way the driver is designed, extremely large transfers require extremely long timeouts. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-7-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: sbefifo: Add configurable in-command timeoutEddie James2023-08-091-1/+29
| | | | | | | | | | A new use case for the SBEFIFO requires a long in-command timeout as the SBE processes each part of the command before clearing the upstream FIFO for the next part of the command. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-6-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: sbefifo: Don't check status during probeEddie James2023-08-091-8/+0
| | | | | | | | | The status check during probe doesn't serve any purpose. Any attempt to use the SBEFIFO will result in the same check and cleanup. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-5-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Use of_match_table for bus matching if specifiedEddie James2023-08-092-2/+17
| | | | | | | | | | Since we have two scom drivers, use the standard of matching if the driver specifies a table so that the right devices go to the right driver. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-4-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Add aliased device numberingEddie James2023-08-091-0/+25
| | | | | | | | | The I2C and SPI subsystems can use an aliased name to number the device. Add similar support to the FSI subsystem for any device type. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Move fsi_slave structure definition to headerEddie James2023-08-097-25/+37
| | | | | | | | | | Some FSI drivers may have need of the slave definition, so move it to a header file. Also use one macro for obtaining a pointer to the fsi_master structure. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-2-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Use of_property_read_reg() to parse "reg"Rob Herring2023-08-091-30/+9
| | | | | | | | | | Use the recently added of_property_read_reg() helper to get the untranslated "reg" address value. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230609183056.1765183-1-robh@kernel.org Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Explicitly include correct DT includesRob Herring2023-08-092-2/+2
| | | | | | | | | | | | | | | | The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230718205508.1790932-1-robh@kernel.org Signed-off-by: Joel Stanley <joel@jms.id.au>
* driver core: make struct device_type.devnode() take a const *Greg Kroah-Hartman2023-01-271-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The devnode() callback in struct device_type should not be modifying the device that is passed into it, so mark it as a const * and propagate the function signature changes out into all relevant subsystems that use this callback. Cc: Jens Axboe <axboe@kernel.dk> Cc: Alison Schofield <alison.schofield@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Ben Widawsky <bwidawsk@kernel.org> Cc: Jeremy Kerr <jk@ozlabs.org> Cc: Joel Stanley <joel@jms.id.au> Cc: Alistar Popple <alistair@popple.id.au> Cc: Eddie James <eajames@linux.ibm.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Jilin Yuan <yuanjilin@cdjrlc.com> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> Cc: Won Chung <wonchung@google.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Acked-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20230111113018.459199-7-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* use less confusing names for iov_iter direction initializersAl Viro2022-11-251-3/+3
| | | | | | | | | | | | | READ/WRITE proved to be actively confusing - the meanings are "data destination, as used with read(2)" and "data source, as used with write(2)", but people keep interpreting those as "we read data from it" and "we write data to it", i.e. exactly the wrong way. Call them ITER_DEST and ITER_SOURCE - at least that is harder to misinterpret... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [fsi] WRITE is "data source", not destination...Al Viro2022-11-251-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fsi: core: Check error number after calling ida_simple_getJiasheng Jiang2022-09-281-0/+3
| | | | | | | | | | | | | If allocation fails, the ida_simple_get() will return error number. So master->idx could be error number and be used in dev_set_name(). Therefore, it should be better to check it and return error if fails, like the ida_simple_get() in __fsi_get_new_minor(). Fixes: 09aecfab93b8 ("drivers/fsi: Add fsi master definition") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20220111073411.614138-1-jiasheng@iscas.ac.cn Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Support probing the hwmon child device from dts nodeEddie James2022-09-281-7/+34
| | | | | | | | | | | | There is now a need for reading devicetree properties in the OCC hwmon driver, which isn't current supported as the FSI driver just instantiates a basic platform device. Add support for this use case by checking for an "occ-hwmon" node and if present, creating an OF device from it. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20220809200701.218059-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: master-ast-cf: Fix missing of_node_put in fsi_master_acf_probeLv Ruyi2022-09-281-0/+2
| | | | | | | | | | of_parse_phandle returns node pointer with refcount incremented, use of_node_put() on it when done. Reported-by: Zeal Robot <zealci@zte.com.cn> Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn> Link: https://lore.kernel.org/r/20220407085911.2491719-1-lv.ruyi@zte.com.cn Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: sbefifo: Add detailed debugging informationJoel Stanley2022-09-281-6/+9
| | | | | | | | | Provide more output on the timeout status, and make some vdbg calls into dbg calls so they can be enabled at runtime. Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20220415050757.281158-1-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: cleanup extern usage in function definitionTom Rix2022-09-281-4/+4
| | | | | | | | | | | | | | | Smatch reports these issues fsi-core.c:395:12: warning: function 'fsi_slave_claim_range' with external linkage has definition fsi-core.c:409:13: warning: function 'fsi_slave_release_range' with external linkage has definition The storage-class-specifier extern is not needed in a definition, so remove it. Signed-off-by: Tom Rix <trix@redhat.com> Link: https://lore.kernel.org/r/20220403140937.3833578-1-trix@redhat.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Prevent use after freeEddie James2022-09-281-3/+15
| | | | | | | | | | | | | Use get_device and put_device in the open and close functions to make sure the device doesn't get freed while a file descriptor is open. Also, lock around the freeing of the device buffer and check the buffer before using it in the submit function. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20220513194424.53468-1-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Fix checksum failure modeEddie James2022-09-271-2/+5
| | | | | | | | | | | Change the checksum errno to something different than the errno used for a bad SBE message. In addition, don't set the user's response length to the data length in this case, since it's not SBE FFDC. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20220426154956.27205-2-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Fix typo in commentLuo Xueqin2022-09-271-1/+1
| | | | | | | | | Spelling mistake in comment. Reported-by: k2ci <kernel-bot@kylinos.cn> Signed-off-by: Luo Xueqin <luoxueqin@kylinos.cn> Link: https://lore.kernel.org/r/20220705152757.27843-1-luoxueqin66@gmail.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* Merge tag 'fsi-for-v5.18' of ↵Greg Kroah-Hartman2022-02-215-63/+135
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/joel/fsi into char-misc-next Joel writes: FSI changes for v5.18 * Improvements in SCOM and OCC drivers for error handling and retries * Addition of tracepoints for initialisation path * API for setting long running SBE FIFO operations * tag 'fsi-for-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/joel/fsi: fsi: Add trace events in initialization path fsi: sbefifo: Implement FSI_SBEFIFO_READ_TIMEOUT_SECONDS ioctl fsi: sbefifo: Use specified value of start of response timeout fsi: occ: Improve response status checking fsi: scom: Remove retries in indirect scoms fsi: scom: Fix error handling
| * fsi: Add trace events in initialization pathEddie James2022-02-212-3/+10
| | | | | | | | | | | | | | | | | | Add definitions for trace events to show the scanning flow. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://lore.kernel.org/r/20220207161640.35605-1-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
| * fsi: sbefifo: Implement FSI_SBEFIFO_READ_TIMEOUT_SECONDS ioctlAmitay Isaacs2022-02-211-0/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | FSI_SBEFIFO_READ_TIMEOUT_SECONDS ioctl sets the read timeout (in seconds) for the response received by sbefifo device from sbe. The timeout affects only the read operation on current sbefifo device fd. Certain SBE operations can take long time to complete and the default timeout of 10 seconds might not be sufficient to start receiving response from SBE. In such cases, allow the timeout to be set to the maximum of 120 seconds. The kernel does not contain the definition of the various SBE operations, so we must expose an interface to userspace to set the timeout for the given operation. Signed-off-by: Amitay Isaacs <amitay@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20220121053816.82253-3-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
| * fsi: sbefifo: Use specified value of start of response timeoutAmitay Isaacs2022-02-211-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For some of the chip-ops where sbe needs to collect trace information, sbe can take a long time (>30s) to respond. Currently these chip-ops will timeout as the start of response timeout defaults to 10s. Instead of default value, use specified value. The require timeout value will be set using ioctl. Signed-off-by: Amitay Isaacs <amitay@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20220121053816.82253-2-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
| * fsi: occ: Improve response status checkingEddie James2022-02-211-31/+56
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the driver sequence number coincidentally equals the previous command response sequence number, the driver may proceed with fetching the entire buffer before the OCC has processed the current command. To be sure the correct response is obtained, check the command type and also retry if any of the response parameters have changed when the rest of the buffer is fetched. Also initialize the driver with a random sequence number in order to reduce the chances of this happening. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20220208152235.19686-1-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
| * fsi: scom: Remove retries in indirect scomsJoel Stanley2022-01-311-26/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit f72ddbe1d7b7 ("fsi: scom: Remove retries") the retries were removed from get and put scoms. That patch missed the retires in get and put indirect scom. For the same reason, remove them from the scom driver to allow the caller to decide to retry. This removes the following special case which would have caused the retry code to return early: - if ((ind_data & XSCOM_DATA_IND_COMPLETE) || (err != SCOM_PIB_BLOCKED)) - return 0; I believe this case is handled. Fixes: f72ddbe1d7b7 ("fsi: scom: Remove retries") Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20211207033811.518981-3-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
| * fsi: scom: Fix error handlingJoel Stanley2022-01-311-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SCOM error handling is made complex by trying to pass around two bits of information: the function return code, and a status parameter that represents the CFAM error status register. The commit f72ddbe1d7b7 ("fsi: scom: Remove retries") removed the "hidden" retries in the SCOM driver, in preference of allowing the calling code (userspace or driver) to decide how to handle a failed SCOM. However it introduced a bug by attempting to be smart about the return codes that were "errors" and which were ok to fall through to the status register parsing. We get the following errors: - EINVAL or ENXIO, for indirect scoms where the value is invalid - EINVAL, where the size or address is incorrect - EIO or ETIMEOUT, where FSI write failed (aspeed master) - EAGAIN, where the master detected a crc error (GPIO master only) - EBUSY, where the bus is disabled (GPIO master in external mode) In all of these cases we should fail the SCOM read/write and return the error. Thanks to Dan Carpenter for the detailed bug report. Fixes: f72ddbe1d7b7 ("fsi: scom: Remove retries") Link: https://lists.ozlabs.org/pipermail/linux-fsi/2021-November/000235.html Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20211207033811.518981-2-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
* | fsi: Aspeed: Fix a potential double freeChristophe JAILLET2022-02-041-6/+11
|/ | | | | | | | | | | | | | | | | | | | | | | | | A struct device can never be devm_alloc()'ed. Here, it is embedded in "struct fsi_master", and "struct fsi_master" is embedded in "struct fsi_master_aspeed". Since "struct device" is embedded, the data structure embedding it must be released with the release function, as is already done here. So use kzalloc() instead of devm_kzalloc() when allocating "aspeed" and update all error handling branches accordingly. This prevent a potential double free(). This also fix another issue if opb_readl() fails. Instead of a direct return, it now jumps in the error handling path. Fixes: 606397d67f41 ("fsi: Add ast2600 master driver") Suggested-by: Greg KH <gregkh@linuxfoundation.org> Suggested-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/2c123f8b0a40dc1a061fae982169fe030b4f47e6.1641765339.git.christophe.jaillet@wanadoo.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* fsi: sbefifo: Use interruptible mutex lockingEddie James2021-10-221-3/+9
| | | | | | | | | | | | | Some SBE operations have extremely large responses and can require several minutes to process the response. During this time, the device lock must be held. If another process attempts an operation, it will wait for the mutex for longer than the kernel hung task watchdog allows. Therefore, use the interruptible function to lock the mutex. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20210803213016.44739-1-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: sbefifo: Add sysfs file indicating a timeout errorEddie James2021-10-221-0/+16
| | | | | | | | | | | | | The SBEFIFO timeout error requires special handling in userspace to do recovery operations. Add a sysfs file to indicate a timeout error, and notify pollers when a timeout occurs. This will be used by the openpower-occ-control application. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20211019211749.38059-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Store the SBEFIFO FFDC in the user response bufferEddie James2021-10-221-18/+48
| | | | | | | | | | | | | If the SBEFIFO response indicates an error, store the response in the user buffer and return an error. Previously, the user had no way of obtaining the SBEFIFO FFDC. The user's buffer now contains data in the event of a failure. No change in the event of a successful transfer. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20211019205307.36946-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Use a large buffer for responsesEddie James2021-10-221-66/+44
| | | | | | | | | | | | | | | | | | | | Allocate a large buffer for each OCC to handle response data. This removes memory allocation during an operation, and also allows for the maximum amount of SBE FFDC. Previously for the putsram and attn commands, only 32 words would have been available, and for getsram, only up to the size of the transfer. SBE FFDC might be up to 8Kb. The SBE interface expects data to be specified in units of words (4 bytes), defined as OCC_MAX_RESP_WORDS. This change allows the full FFDC capture to be implemented, where before it was not available. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20211019205307.36946-2-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Force sequence numbering per OCCEddie James2021-10-151-17/+37
| | | | | | | | | | | | | | Set and increment the sequence number during the submit operation. This prevents sequence number conflicts between different users of the interface. A sequence number conflict may result in a user getting an OCC response meant for a different command. Since the sequence number is now modified, the checksum must be calculated and set before submitting the command. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20210721190231.117185-2-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi/sbefifo: Fix reset timeoutJoachim Fenkes2021-06-041-3/+5
| | | | | | | | | | | | | On BMCs with lower timer resolution than 1ms, msleep(1) will take way longer than 1ms, so looping 10k times won't wait for 10s but significantly longer. Fix this by using jiffies like the rest of the code. Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO") Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com> Link: https://lore.kernel.org/r/20200724071518.430515-3-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi/sbefifo: Clean up correct FIFO when receiving reset request from SBEJoachim Fenkes2021-06-041-1/+1
| | | | | | | | | | | When the SBE requests a reset via the down FIFO, that is also the FIFO we should go and reset ;) Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO") Signed-off-by: Joachim Fenkes <FENKES@de.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20200724071518.430515-2-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: master-ast-cf: Remove redundant error printing in fsi_master_acf_probe()Zhen Lei2021-06-041-1/+0
| | | | | | | | | | | | | | | When devm_ioremap_resource() fails, a clear enough error message will be printed by its subfunction __devm_ioremap_resource(). The error information contains the device name, failure cause, and possibly resource information. Therefore, remove the error printing here to simplify code and reduce the binary size. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Link: https://patchwork.ozlabs.org/project/linux-fsi/patch/20210511085745.4340-1-thunder.leizhen@huawei.com/ Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: Aspeed: Reduce poll timeoutEddie James2021-06-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The lengthy timeout previously used sometimes resulted in scheduling problems, detailed below. Therefore reduce the timeout to 500us. This timeout selection is supported by the benchmarks collected below with various clock dividers. This is purely the time spent polling (reported by ktime_get()). div 1: max:150us avg: 2us div 2: max:155us avg: 3us div 4: max:149us avg: 7us div 8: max:153us avg: 13us div 16: max:197us avg: 21us div 32: max:181us avg: 50us div 64: max:262us avg:100us Jan 22 01:27:21 rain27bmc kernel: rcu: INFO: rcu_sched self-detected stall on CPU Jan 22 01:27:21 rain27bmc kernel: rcu: 0-....: (2099 ticks this GP) idle=0ca/1/0x40000002 softirq=349573/349573 fqs=1048 Jan 22 01:27:21 rain27bmc kernel: (t=2100 jiffies g=841149 q=7163) Jan 22 01:27:21 rain27bmc kernel: NMI backtrace for cpu 0 Jan 22 01:27:21 rain27bmc kernel: CPU: 0 PID: 5959 Comm: ibm-read-vpd Not tainted 5.8.17-a9b4ea8 #1 Jan 22 01:27:21 rain27bmc kernel: Hardware name: Generic DT based system Jan 22 01:27:21 rain27bmc kernel: Backtrace: Jan 22 01:27:25 rain27bmc kernel: [<8010d92c>] (dump_backtrace) from [<8010db80>] (show_stack+0x20/0x24) ... Jan 22 01:27:25 rain27bmc kernel: [<8010130c>] (gic_handle_irq) from [<80100b0c>] (__irq_svc+0x6c/0x90) Jan 22 01:27:25 rain27bmc kernel: Exception stack(0xb79159b0 to 0xb79159f8) Jan 22 01:27:25 rain27bmc kernel: 59a0: 9e88e5d5 00000559 00000559 00000018 Jan 22 01:27:25 rain27bmc kernel: 59c0: 00000000 9f217c55 00000003 00000559 a0201c00 bfa4d048 bfa4d000 b7915a44 Jan 22 01:27:25 rain27bmc kernel: 59e0: 40e88f8a b7915a00 3254e553 80734924 80030113 ffffffff Jan 22 01:27:25 rain27bmc kernel: r9:b7914000 r8:a0201c00 r7:b79159e4 r6:ffffffff r5:80030113 r4:80734924 Jan 22 01:27:25 rain27bmc kernel: [<807348b4>] (__opb_read) from [<80734d98>] (aspeed_master_read+0xbc/0xcc) Jan 22 01:27:25 rain27bmc kernel: r10:00000004 r9:00000002 r8:80734cdc r7:bd33fa40 r6:00000004 r5:bd33f840 Jan 22 01:27:25 rain27bmc kernel: r4:00201c00 Jan 22 01:27:25 rain27bmc kernel: [<80734cdc>] (aspeed_master_read) from [<807320f0>] (fsi_master_read+0x6c/0x1bc) ... Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20210211194846.35475-1-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: aspeed: convert to devm_platform_ioremap_resourceYangtao Li2021-06-041-3/+1
| | | | | | | | | Use devm_platform_ioremap_resource() to simplify code. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Link: https://lore.kernel.org/r/20191228190631.26777-1-tiny.windzz@gmail.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Log error for checksum failureEddie James2021-06-041-3/+7
| | | | | | | | | | Log an error if the response checksum doesn't match the calculated checksum. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20210209171235.20624-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
* fsi: occ: Don't accept response from un-initialized OCCEddie James2021-06-041-0/+1
| | | | | | | | | | | | If the OCC is not initialized and responds as such, the driver should continue waiting for a valid response until the timeout expires. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Fixes: 7ed98dddb764 ("fsi: Add On-Chip Controller (OCC) driver") Link: https://lore.kernel.org/r/20210209171235.20624-2-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
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