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Message-ID: <2a4f1e0c8c9543caa71a0cb50e65e256@huawei.com> Date: Wed, 31 Jul 2024 11:28:35 +0000 From: Shiju Jose <shiju.jose@...wei.com> To: Fan Ni <nifan.cxl@...il.com> CC: "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>, "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>, "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "bp@...en8.de" <bp@...en8.de>, "tony.luck@...el.com" <tony.luck@...el.com>, "rafael@...nel.org" <rafael@...nel.org>, "lenb@...nel.org" <lenb@...nel.org>, "mchehab@...nel.org" <mchehab@...nel.org>, "dan.j.williams@...el.com" <dan.j.williams@...el.com>, "dave@...olabs.net" <dave@...olabs.net>, "Jonathan Cameron" <jonathan.cameron@...wei.com>, "dave.jiang@...el.com" <dave.jiang@...el.com>, "alison.schofield@...el.com" <alison.schofield@...el.com>, "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>, "ira.weiny@...el.com" <ira.weiny@...el.com>, "david@...hat.com" <david@...hat.com>, "Vilas.Sridharan@....com" <Vilas.Sridharan@....com>, "leo.duran@....com" <leo.duran@....com>, "Yazen.Ghannam@....com" <Yazen.Ghannam@....com>, "rientjes@...gle.com" <rientjes@...gle.com>, "jiaqiyan@...gle.com" <jiaqiyan@...gle.com>, "Jon.Grimm@....com" <Jon.Grimm@....com>, "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "naoya.horiguchi@....com" <naoya.horiguchi@....com>, "james.morse@....com" <james.morse@....com>, "jthoughton@...gle.com" <jthoughton@...gle.com>, "somasundaram.a@....com" <somasundaram.a@....com>, "erdemaktas@...gle.com" <erdemaktas@...gle.com>, "pgonda@...gle.com" <pgonda@...gle.com>, "duenwen@...gle.com" <duenwen@...gle.com>, "mike.malvestuto@...el.com" <mike.malvestuto@...el.com>, "gthelen@...gle.com" <gthelen@...gle.com>, "wschwartz@...erecomputing.com" <wschwartz@...erecomputing.com>, "dferguson@...erecomputing.com" <dferguson@...erecomputing.com>, "wbs@...amperecomputing.com" <wbs@...amperecomputing.com>, tanxiaofei <tanxiaofei@...wei.com>, "Zengtao (B)" <prime.zeng@...ilicon.com>, "Roberto Sassu" <roberto.sassu@...wei.com>, "kangkang.shen@...urewei.com" <kangkang.shen@...urewei.com>, wanghuiqiang <wanghuiqiang@...wei.com>, Linuxarm <linuxarm@...wei.com> Subject: RE: [PATCH v10 00/11] EDAC: Scrub: introduce generic EDAC RAS control feature driver + CXL/ACPI-RAS2 drivers >-----Original Message----- >From: Fan Ni <nifan.cxl@...il.com> >Sent: 30 July 2024 22:01 >To: Shiju Jose <shiju.jose@...wei.com> >Cc: linux-edac@...r.kernel.org; linux-cxl@...r.kernel.org; linux- >acpi@...r.kernel.org; linux-mm@...ck.org; linux-kernel@...r.kernel.org; >bp@...en8.de; tony.luck@...el.com; rafael@...nel.org; lenb@...nel.org; >mchehab@...nel.org; dan.j.williams@...el.com; dave@...olabs.net; Jonathan >Cameron <jonathan.cameron@...wei.com>; dave.jiang@...el.com; >alison.schofield@...el.com; vishal.l.verma@...el.com; ira.weiny@...el.com; >david@...hat.com; Vilas.Sridharan@....com; leo.duran@....com; >Yazen.Ghannam@....com; rientjes@...gle.com; jiaqiyan@...gle.com; >Jon.Grimm@....com; dave.hansen@...ux.intel.com; >naoya.horiguchi@....com; james.morse@....com; jthoughton@...gle.com; >somasundaram.a@....com; erdemaktas@...gle.com; pgonda@...gle.com; >duenwen@...gle.com; mike.malvestuto@...el.com; gthelen@...gle.com; >wschwartz@...erecomputing.com; dferguson@...erecomputing.com; >wbs@...amperecomputing.com; nifan.cxl@...il.com; tanxiaofei ><tanxiaofei@...wei.com>; Zengtao (B) <prime.zeng@...ilicon.com>; Roberto >Sassu <roberto.sassu@...wei.com>; kangkang.shen@...urewei.com; >wanghuiqiang <wanghuiqiang@...wei.com>; Linuxarm ><linuxarm@...wei.com> >Subject: Re: [PATCH v10 00/11] EDAC: Scrub: introduce generic EDAC RAS >control feature driver + CXL/ACPI-RAS2 drivers > >On Fri, Jul 26, 2024 at 05:05:44PM +0100, shiju.jose@...wei.com wrote: >> From: Shiju Jose <shiju.jose@...wei.com> >> >Hi Shiju, >FYI. Not sure if I missed something, but I hit some issue when compiling the >patch set. > >I tried to apply this patch set on top of fixes branch (tag: >cxl-fixes-6.10-rc7, origin/fixes), and compile, it fails with following erors. > >fan@DT ~/c/linux-fixes (fixes)> make -j 16 mkdir -p /home/fan/cxl/linux- >fixes/tools/objtool && make O=/home/fan/cxl/linux-fixes subdir=tools/objtool -- >no-print-directory -C objtool > INSTALL libsubcmd_headers > CALL scripts/checksyscalls.sh > CC drivers/ras/acpi_ras2.o >drivers/ras/acpi_ras2.c: In function ‘ras2_update_patrol_scrub_params_cache’: >drivers/ras/acpi_ras2.c:64:37: error: implicit declaration of function ‘FIELD_GET’ >[-Werror=implicit-function-declaration] > 64 | ras2_ctx->min_scrub_cycle = >FIELD_GET(RAS2_PATROL_SCRUB_MIN_SCHRS_OUT_MASK, > | ^~~~~~~~~ >drivers/ras/acpi_ras2.c: In function ‘ras2_hw_scrub_set_enabled_bg’: >drivers/ras/acpi_ras2.c:216:50: error: implicit declaration of function >‘FIELD_PREP’ [-Werror=implicit-function-declaration] > 216 | ps_sm->params.scrub_params_in |= >FIELD_PREP(RAS2_PATROL_SCRUB_SCHRS_IN_MASK, > | ^~~~~~~~~~ >cc1: all warnings being treated as errors >make[4]: *** [scripts/Makefile.build:244: drivers/ras/acpi_ras2.o] Error 1 >make[3]: *** [scripts/Makefile.build:485: drivers/ras] Error 2 >make[3]: *** Waiting for unfinished jobs.... >make[2]: *** [scripts/Makefile.build:485: drivers] Error 2 >make[1]: *** [/home/fan/cxl/linux-fixes/Makefile:1934: .] Error 2 >make: *** [Makefile:240: __sub-make] Error 2 > > >It seems we need to include "linux/bitfield.h". Fixed the compiling with following >change: > >fan@DT ~/c/linux-fixes (fixes)> git diff diff --git a/drivers/ras/acpi_ras2.c >b/drivers/ras/acpi_ras2.c index b2381d5b37d0..b4d229e6451f 100644 >--- a/drivers/ras/acpi_ras2.c >+++ b/drivers/ras/acpi_ras2.c >@@ -11,6 +11,7 @@ > #include <linux/edac_ras_feature.h> > #include <linux/platform_device.h> > #include <acpi/ras2_acpi.h> >+#include <linux/bitfield.h> > > #define RAS2_DEV_NUM_RAS_FEATURES 1 > > > >Fan Hi Fan, Thanks for looking into this issue and giving the fix. The series was tested and produced on mainline v6.10-rc3 with arm64 build. I checked in the cxl-fixes-6.10-rc7 and mainline v6.10-rc7 for this issue. For arm64, build is successful, however for X86, build reproduced the build errors you reported. I will incorporate the fix in the next version. Thanks, Shiju > >> Previously known as "ras: scrub: introduce subsystem + CXL/ACPI-RAS2 >drivers". >> >> EDAC based Subsystem for controlling RAS Features >> ================================================= >> The proposed EDAC based subsystem for controlling RAS features and >> expose the feature's control attributes to the userspace in sysfs. >> Some Examples: >> - Scrub control >> - Error Check Scrub (ECS) control >> - ACPI RAS2 features >> - ACPI Address Range Scrubbing (ARS) >> - Post Package Repair (PPR) etc. >> >> High level design is illustrated in the following diagram. >> >> _______________________________________________ >> | Userspace - Rasdaemon | >> | ____________ | >> | | RAS CXL | _____________ | >> | | Err Handler|----->| | | >> | |____________| | RAS Dynamic | | >> | ____________ | Scrub | | >> | | RAS Memory |----->| Controller | | >> | | Err Handler| |_____________| | >> | |____________| | | >> |__________________________|____________________| >> | >> | >> _______________________________|______________________________ >> | Kernel EDAC based SubSystem | for RAS Features Control | >> | ______________________________|____________________________ | >> || EDAC Core Sysfs EDAC| Bus | | >> || __________________________|_______ _____________ | | >> || |/sys/bus/edac/devices/<dev>/scrub/| | EDAC Device | | | >> || |/sys/bus/edac/devices/<dev>/ecs*/ |<->| EDAC MC | | | >> || |/sys/bus/edac/devices/<dev>/ars/ | | EDAC Sysfs | | | >> || |/sys/bus/edac/devices/<dev>/ppr/ | | EDAC Module | | | >> || |__________________________________| |_____________| | | >> || | EDAC Bus | | >> || Get | | | >> || __________ Feature's | __________ | | >> || | |Descs _________|______ | | | | >> || |EDAC Scrub|<-----| EDAC RAS |---->| EDAC ARS | | | >> || |__________| |Control Feature | |__________| | | >> || __________ | Driver | __________ | | >> || | |<-----|________________|---->| | | | >> || |EDAC ECS | Register RAS | Features | EDAC PPR | | | >> || |__________| | |__________| | | >> || ______________________|___________________ | | >> ||_________|_____________|_____________|____________|________| | >> | _______|____ _____|______ ____|______ ___|_____ | >> | | | | CXL Mem | | | | | | >> | | ACPI RAS2 | | Driver | | ACPI ARS | | PPR | | >> | | Driver | | Scrub,ECS | | Driver | | Driver | | >> | |____________| |___________| |___________| |_________| | >> | | | | | | >> >|________|______________|______________|___________|___________| >> | | | | >> _______|______________|______________|___________|___________ >> | __|______________|_ ____________|___________|_____ | >> | | | | >> | | Platform HW and Firmware | | >> | |__________________________________________________| | >> >|_____________________________________________________________| >> >> 1. EDAC Features components - Create feature specific descriptors. >> 2. EDAC RAS Feature driver - Get feature's attr descriptors from the >> EDAC RAS feature component and registers device's RAS features with >> EDAC bus and expose the feature's sysfs attributes under the sysfs >> EDAC bus. >> 3. RAS dynamic scrub controller - Userspace sample module added in the >> rasdaemon to start scrubbing when excess number of related errors >> are reported in a short span of time. >> >> The added EDAC feature specific components (e.g. EDAC scrub, EDAC ECS, >> EDAC PPR etc) do callbacks to the parent driver (e.g. CXL driver, >> ACPI RAS driver etc) for the controls rather than just letting the >> caller deal with it because of the following reasons. >> 1. Enforces a common API across multiple implementations can do that >> via review, but that's not generally gone well in the long run for >> subsystems that have done it (several have later moved to callback >> and feature list based approaches). >> 2. Gives a path for 'intercepting' in the EDAC feature driver. >> An example for this is that we could intercept PPR repair calls >> and sanity check that the memory in question is offline before >> passing back to the underlying code. Sure we could rely on doing >> that via some additional calls from the parent driver, but the >> ABI will get messier. >> 3. (Speculative) we may get in kernel users of some features in the >> long run. >> >> More details of the common RAS features are described in the following >> sections. >> >> Memory Scrubbing >> ================ >> Increasing DRAM size and cost has made memory subsystem reliability an >> important concern. These modules are used where potentially corrupted >> data could cause expensive or fatal issues. Memory errors are one of >> the top hardware failures that cause server and workload crashes. >> >> Memory scrub is a feature where an ECC engine reads data from each >> memory media location, corrects with an ECC if necessary and writes >> the corrected data back to the same memory media location. >> >> The memory DIMMs could be scrubbed at a configurable rate to detect >> uncorrected memory errors and attempts to recover from detected memory >> errors providing the following benefits. >> - Proactively scrubbing memory DIMMs reduces the chance of a correctable >> error becoming uncorrectable. >> - Once detected, uncorrected errors caught in unallocated memory pages are >> isolated and prevented from being allocated to an application or the OS. >> - The probability of software/hardware products encountering memory >> errors is reduced. >> Some details of background can be found in Reference [5]. >> >> There are 2 types of memory scrubbing, 1. Background (patrol) >> scrubbing of the RAM whilest the RAM is otherwise >> idle. >> 2. On-demand scrubbing for a specific address range/region of memory. >> >> There are several types of interfaces to HW memory scrubbers >> identified such as ACPI NVDIMM ARS(Address Range Scrub), CXL memory >> device patrol scrub, CXL DDR5 ECS, ACPI RAS2 memory scrubbing. >> >> The scrub control varies between different memory scrubbers. To allow >> for standard userspace tooling there is a need to present these >> controls with a standard ABI. >> >> Introduce generic memory EDAC scrub control which allows user to >> control underlying scrubbers in the system via generic sysfs scrub >> control interface. >> >> Use case of common scrub control feature >> ======================================== >> 1. There are several types of interfaces to HW memory scrubbers identified >> such as ACPI NVDIMM ARS(Address Range Scrub), CXL memory device patrol >> scrub, CXL DDR5 ECS, ACPI RAS2 memory scrubbing features and software >> based memory scrubber(discussed in the community Reference [5]). >> Also some scrubbers support controlling (background) patrol scrubbing >> (ACPI RAS2, CXL) and/or on-demand scrubbing(ACPI RAS2, ACPI ARS). >> However the scrub controls varies between memory scrubbers. Thus there >> is a requirement for a standard generic sysfs scrub controls exposed >> to the userspace for the seamless control of the HW/SW scrubbers in >> the system by admin/scripts/tools etc. >> 2. Scrub controls in user space allow the user to disable the scrubbing >> in case disabling of the background patrol scrubbing or changing the >> scrub rate are needed for other purposes such as performance-aware >> operations which requires the background operations to be turned off >> or reduced. >> 3. Allows to perform on-demand scrubbing for specific address range if >> supported by the scrubber. >> 4. User space tools controls scrub the memory DIMMs regularly at a >> configurable scrub rate using the sysfs scrub controls discussed help, >> - to detect uncorrectable memory errors early before user accessing >memory, >> which helps to recover the detected memory errors. >> - reduces the chance of a correctable error becoming uncorrectable. >> 5. Policy control for hotplugged memory. There is not necessarily a system >> wide bios or similar in the loop to control the scrub settings on a CXL >> device that wasn't there at boot. What that setting should be is a policy >> decision as we are trading of reliability vs performance - hence it should >> be in control of userspace. As such, 'an' interface is needed. Seems more >> sensible to try and unify it with other similar interfaces than spin >> yet another one. >> >> The draft version of userspace code for dynamic scrub control, based >> on frequency of memory errors reported to the userspace, is added in >> rasdaemon and enabled, tested for CXL device based patrol scrubbing >> feature and ACPI RAS2 based scrubbing feature. >> >> https://github.com/shijujose4/rasdaemon/tree/scrub_control_6_june_2024 >> >> Comparison of scrubbing features >> ================================ >> ................................................................ >> . . ACPI . CXL patrol. CXL ECS . ARS . >> . Name . RAS2 . scrub . . . >> ................................................................ >> . . . . . . >> . On-demand . Supported . No . No . Supported . >> . Scrubbing . . . . . >> . . . . . . >> ................................................................ >> . . . . . . >> . Background . Supported . Supported . Supported . No . >> . scrubbing . . . . . >> . . . . . . >> ................................................................ >> . . . . . . >> . Mode of . Scrub ctrl. per device. per memory. Unknown . >> . scrubbing . per NUMA . . media . . >> . . domain. . . . . >> ................................................................ >> . . . . . . >> . Query scrub . Supported . Supported . Supported . Supported . >> . capabilities . . . . . >> . . . . . . >> ................................................................ >> . . . . . . >> . Setting . Supported . No . No . Supported . >> . address range. . . . . >> . . . . . . >> ................................................................ >> . . . . . . >> . Setting . Supported . Supported . No . No . >> . scrub rate . . . . . >> . . . . . . >> ................................................................ >> . . . . . . >> . Unit for . Not . in hours . No . No . >> . scrub rate . Defined . . . . >> . . . . . . >> ................................................................ >> . . Supported . . . . >> . Scrub . on-demand . No . No . Supported . >> . status/ . scrubbing . . . . >> . Completion . only . . . . >> ................................................................ >> . UC error . .CXL general.CXL general. ACPI UCE . >> . reporting . Exception .media/DRAM .media/DRAM . notify and. >> . . .event/media.event/media. query . >> . . .scan? .scan? . ARS status. >> ................................................................ >> . . . . . . >> . Clear UC . No . No . No . Supported . >> . error . . . . . >> . . . . . . >> ................................................................ >> . . . . . . >> . Translate . No . No . No . Supported . >> . *(1)SPA to . . . . . >> . *(2)DPA . . . . . >> ................................................................ >> . . . . . . >> . Error inject . No . Can inject. No . Supported . >> . . . poison for. . . >> . . . CXL . . . >> ................................................................ >> *(1) - SPA - System Physical Address. See section 9.19.7.8 >> Function Index 5 - Translate SPA of ACPI spec r6.5. >> *(2) - DPA - Device Physical Address. See section 9.19.7.8 >> Function Index 5 - Translate SPA of ACPI spec r6.5. >> >> CXL Scrubbing features >> ====================== >> Add support for control CXL patrol scrubber and ACPI RAS2 HW based >> memory patrol scrubber and register with the EDAC scrub to expose the >> scrub controls to the userspace tool. >> >> CXL spec r3.1 section 8.2.9.9.11.1 describes the memory device patrol >> scrub control feature. The device patrol scrub proactively locates and >> makes corrections to errors in regular cycle. The patrol scrub control >> allows the request to configure patrol scrubber's input configurations. >> >> The patrol scrub control allows the requester to specify the number of >> hours in which the patrol scrub cycles must be completed, provided >> that the requested number is not less than the minimum number of hours >> for the patrol scrub cycle that the device is capable of. In addition, >> the patrol scrub controls allow the host to disable and enable the >> feature in case disabling of the feature is needed for other purposes >> such as performance-aware operations which require the background >> operations to be turned off. >> >> The Error Check Scrub (ECS) is a feature defined in JEDEC DDR5 SDRAM >> Specification (JESD79-5) and allows the DRAM to internally read, >> correct single-bit errors, and write back corrected data bits to the >> DRAM array while providing transparency to error counts. >> >> The DDR5 device contains number of memory media FRUs per device. The >> DDR5 ECS feature and thus the ECS control driver supports configuring >> the ECS parameters per FRU. >> >> ACPI RAS2 Hardware-based Memory Scrubbing >> ========================================= >> ACPI spec 6.5 section 5.2.21 ACPI RAS2 describes ACPI RAS2 table >> provides interfaces for platform RAS features and supports independent >> RAS controls and capabilities for a given RAS feature for multiple >> instances of the same component in a given system. >> Memory RAS features apply to RAS capabilities, controls and operations >> that are specific to memory. RAS2 PCC sub-spaces for memory-specific >> RAS features have a Feature Type of 0x00 (Memory). >> >> The platform can use the hardware-based memory scrubbing feature to >> expose controls and capabilities associated with hardware-based memory >> scrub engines. The RAS2 memory scrubbing feature supports following as >> per spec, >> - Independent memory scrubbing controls for each NUMA domain, identified >> using its proximity domain. >> Note: However AmpereComputing has single entry repeated as they have >> centralized controls. >> - Provision for background (patrol) scrubbing of the entire memory system, >> as well as on-demand scrubbing for a specific region of memory. >> >> ACPI Address Range Scrubbing(ARS) >> ================================ >> ARS allows the platform to communicate memory errors to system software. >> This capability allows system software to prevent accesses to >> addresses with uncorrectable errors in memory. ARS functions manage >> all NVDIMMs present in the system. Only one scrub can be in progress >> system wide at any given time. >> Following functions are supported as per the specification. >> 1. Query ARS Capabilities for a given address range, indicates platform >> supports the ACPI NVDIMM Root Device Unconsumed Error Notification. >> 2. Start ARS triggers an Address Range Scrub for the given memory range. >> Address scrubbing can be done for volatile memory, persistent memory, >> or both. >> 3. Query ARS Status command allows software to get the status of ARS, >> including the progress of ARS and ARS error record. >> 4. Clear Uncorrectable Error. >> 5. Translate SPA >> 6. ARS Error Inject etc. >> Note: Support for ARS is not added in this series because to reduce >> the line of code for review and could be added after initial code is merged. >> We'd like feedback on whether this is of interest to ARS community? >> >> Series adds, >> 1. Generic EDAC RAS feature driver, EDAC scrub driver, EDAC ECS driver >> supports memory scrub control, ECS control and other RAS features >> in the system. >> 2. Support for CXL feature mailbox commands, which is used by >> CXL device scrubbing features. >> 3. CXL scrub driver supporting patrol scrub control (device and >> region based). >> 4. CXL ECS driver supporting ECS control feature. >> 5. ACPI RAS2 driver adds OS interface for RAS2 communication through >> PCC mailbox and extracts ACPI RAS2 feature table (RAS2) and >> create platform device for the RAS memory features, which binds >> to the memory ACPI RAS2 driver. >> 7. Memory ACPI RAS2 driver gets the PCC subspace for communicating >> with the ACPI compliant platform supports ACPI RAS2. Add callback >> functions and registers with EDAC scrub to support user to >> control the HW patrol scrubbers exposed to the kernel via the >> ACPI RAS2 table. >> >> The CXL specific scrub and ECS features are supported in >> https://gitlab.com/qemu-project/qemu.git >> >> Open Questions based on feedbacks from the community: >> 1. Leo: Standardize unit for scrub rate, for example ACPI RAS2 does not define >> unit for the scrub rate. RAS2 clarification needed. >> 2. Jonathan: Any need for discoverability of capability to scan different regions, >> such as global PA space to the userspace. Left as future extension. >> 3. Jiaqi: >> - STOP_PATROL_SCRUBBER from RAS2 must be blocked and, must not be >exposed to >> OS/userspace. Stopping patrol scrubber is unacceptable for platform where >> OEM has enabled patrol scrubber, because the patrol scrubber is a key part >> of logging and is repurposed for other RAS actions. >> If the OEM does not want to expose this control, they should lock it down so >the >> interface is not exposed to the OS. These features are optional afterall. >> - "Requested Address Range"/"Actual Address Range" (region to scrub) is a >> similarly bad thing to expose in RAS2. >> If the OEM does not want to expose this, they should lock it down so the >> interface is not exposed to the OS. These features are optional afterall. >> 4. Borislav: >> - How the scrub control exposed to the userspace will be used? >> POC added in rasdaemon with dynamic scrub control for CXL memory >media >> errors and memory errors reported to the userspace. >> https://github.com/shijujose4/rasdaemon/tree/scrub_control_6_june_2024 >> - Is the scrub interface is sufficient for the use cases? >> - Who is going to use scrub controls tools/admin/scripts? >> 1) Rasdaemon for dynamic control >> 2) Udev script for more static 'defaults' on hotplug etc. >> >> References: >> 1. ACPI spec r6.5 section 5.2.21 ACPI RAS2. >> 2. ACPI spec r6.5 section 9.19.7.2 ARS. >> 3. CXL spec r3.1 8.2.9.9.11.1 Device patrol scrub control feature 4. >> CXL spec r3.1 8.2.9.9.11.2 DDR5 ECS feature 5. Background information >> about kernel support for memory scan, memory >> error detection and ACPI RASF. >> >> https://lore.kernel.org/all/20221103155029.2451105-1-jiaqiyan@google.c >> om/ >> 6. Discussions on RASF: >> >> https://lore.kernel.org/lkml/20230915172818.761-1-shiju.jose@huawei.co >> m/#r >> >> Changes >> ======= >> v9 -> v10: >> 1. Feedback from Mauro Carvalho Chehab: >> - Changes suggested in EDAC RAS feature driver. >> use uppercase for enums, if else to switch-case, documentation for >> static scrub and ecs init functions etc. >> - Changes suggested in EDAC scrub. >> unit of scrub cycle hour to seconds. >> attribute node cycle_in_hours_avaiable to min_cycle_duration and >> max_cycle_duration. >> attribute node cycle_in_hours to current_cycle_duration. >> Use base 0 for kstrtou64() and kstrtol() functions. >> etc. >> - Changes suggested in EDAC ECS. >> uppercase for enums >> add ABI documentation. etc >> >> 2. Feedback from Fan: >> - Changes suggested in EDAC RAS feature driver. >> use uppercase for enums, change if...else to switch-case. >> some optimization in edac_ras_dev_register() function >> add missing goto free_ctx >> - Changes suggested in the code for feature commands. >> - CXL driver scrub and ECS code >> use uppercase for enums, fix typo, use enum type for mode >> fix lonf lines etc. >> >> v8 -> v9: >> 1. Feedback from Borislav: >> - Add scrub control driver to the EDAC on feedback from Borislav. >> - Changed DEVICE_ATTR_..() static. >> - Changed the write permissions for scrub control sysfs files as >> root-only. >> 2. Feedback from Fan: >> - Optimized cxl_get_feature() function by using min() and removed >> feat_out_min_size. >> - Removed unreached return from cxl_set_feature() function. >> - Changed the term "rate" to "cycle_in_hours" in all the >> scrub control code. >> - Allow cxl_mem_probe() continue if cxl_mem_patrol_scrub_init() fail, >> with just a debug warning. >> >> 3. Feedback from Jonathan: >> - Removed patch __free() based cleanup function for acpi_put_table. >> and added fix in the acpi ras2 driver. >> >> 4. Feedback from Dan Williams: >> - Allow cxl_mem_probe() continue if cxl_mem_patrol_scrub_init() fail, >> with just a debug warning. >> - Add support for CXL region based scrub control. >> >> 5. Feedback from Daniel Ferguson on RAS2 drivers: >> In the ACPI RAS2 driver, >> - Incorporated the changes given for clearing error reported. >> - Incorporated the changes given for check the Set RAS Capability >> status and return an appropriate error. >> In the RAS2 memory driver, >> - Added more checks for start/stop bg and on-demand scrubbing >> so that addr range in cache do not get cleared and restrict >> permitted operations during scrubbing. >> >> v7 -> v8: >> 1. Add more detailed cover letter and add info for basic analysis >> of ACPI ARS for comment from Dan Williams. >> 2. Changed file name etc from ras2 to acpi_ras2 in memory ACPI RAS2 >> driver for comment from Boris. >> 3. Add documents for usage for comment from Jonathan. >> 4. Changed logic in memory/acpi_ras2.c for enable background >> scrubbing to allow setting the scrub rate. >> 5. Merged memory/acpi_ras2_common.c with memory/acpi_ras2.c and >> obselete code, suggested by Jonathan. >> 6. Initial optimizations and cleanup especially in the memory/acpi_ras2. >> 7. Removed CXL ECS support for time being. >> 8. Removed support for region based scrub control from the scrub >> subsytem, which was needed for the CXL ECS, can be added later >> if required. >> 9. Fixed the format of few comments and a definition in CXL feature >> code for the feedbacks from Fan. >> 11. Jonathan done several optimizations, interface changes and >> cleanups all over the code. >> 12. Fixes for feedbacks from Daniel Ferguson(Amperecomputing) >> for RAS2. >> 13. Workaround for a RAS2 case of only one actual controller as >> reported by Daniel Ferguson(AmpereComputing) in their hardware. >> 14. Feedback from Yazen, move the common scrub and ras2 changes >> under /drivers/ras/. >> 15. Drop patch ACPICA: ACPI 6.5: Add support for RAS2 table because >> Rafael queued the patch. >> >> https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/co >> mmit/?h=bleeding-edge&id=9726d821f88e284ecd998b76ae5f2174721cd9dc >> >> v6 -> v7: >> 1. Main changes for comments from Jonathan, Thanks. >> 1.1. CXL >> - Changes for deal with small mail box and supporting multipart >> feature data transfers. >> - Provide more specific parameters to mbox supported/get/set features >> interface functions. >> - kvmalloc -> kmalloc in CXL scrub mem allocation for feature commands. >> - Changed the way using __free(kfree) >> - Removed readback and verify for setting CXL scrub patrol and ECS >> parameters. Could be added later if needed. >> - In is_visible() callback functions for scrub control sysfs attrs >> changed to writeback the default attribute mode value instead of >> setting per attrs. >> - Add documentation for sysfs interfaces for CXL ECS scrub control. >> 1.2. RAS2 >> - In rasf common code, rename rasf to ras2 because RASF seems obselete. >> - Replace pr_* with dev_* log function calls from ACPI RAS2 and >> memory RAS2 drivers. >> - In rasf common code, rename rasf to ras2. >> - Removed including unnecessary .h file from memory RAS2 driver. >> - In is_visible() callback functions for scrub control sysfs attrs >> changed to writeback the default attribute mode value instead of >> setting per attribute. >> >> 2. Changes for comments from Fan, Thanks. >> - Add debug message if cxl patrol scrub and ecs init function >> calls fail. >> 3. Updated cover letter for feedback from Dan Williams. >> >> v5 -> v6: >> 1. Changes for comments from Davidlohr, Thanks. >> - Update CXL feature code based on spec 3.1. >> - attrb -> attr >> - Use enums with default counting. >> 2. Rebased to the latest kernel. >> >> v4 -> v5: >> 1. Following are the main changes made based on the feedback from Dan >Williams on v4. >> 1.1. In the scrub subsystem the common scrub control attributes are statically >defined >> instead of dynamically created. >> 1.2. Add scrub subsystem support externally defined attribute group. >> Add CXL ECS driver define ECS specific attribute group and pass to >> the scrub subsystem. >> 1.3. Move cxl_mem_ecs_init() to cxl/core/region.c so that the CXL region_id >> is used in the registration with the scrub subsystem. >> 1.4. Add previously posted RASF common and RAS2 patches to this scrub >series. >> >> 2. Add support for the 'enable_background_scrub' attribute >> for RAS2, on request from Bill >Schwartz(wschwartz@...erecomputing.com). >> >> v3 -> v4: >> 1. Fixes for the warnings/errors reported by kernel test robot. >> 2. Add support for reading the 'enable' attribute of CXL patrol scrub. >> >> Changes >> v2 -> v3: >> 1. Changes for comments from Davidlohr, Thanks. >> - Updated cxl scrub kconfig >> - removed usage of the flag is_support_feature from >> the function cxl_mem_get_supported_feature_entry(). >> - corrected spelling error. >> - removed unnecessary debug message. >> - removed export feature commands to the userspace. >> 2. Possible fix for the warnings/errors reported by kernel >> test robot. >> 3. Add documentation for the common scrub configure attributes. >> >> v1 -> v2: >> 1. Changes for comments from Dave Jiang, Thanks. >> - Split patches. >> - reversed xmas tree declarations. >> - declared flags as enums. >> - removed few unnecessary variable initializations. >> - replaced PTR_ERR_OR_ZERO() with IS_ERR() and PTR_ERR(). >> - add auto clean declarations. >> - replaced while loop with for loop. >> - Removed allocation from cxl_get_supported_features() and >> cxl_get_feature() and make change to take allocated memory >> pointer from the caller. >> - replaced if/else with switch case. >> - replaced sprintf() with sysfs_emit() in 2 places. >> - replaced goto label with return in few functions. >> 2. removed unused code for supported attributes from ecs. >> 3. Included following common patch for scrub configure driver >> to this series. >> "memory: scrub: Add scrub driver supports configuring memory scrubbers >> in the system" >> >> >> Jonathan Cameron (1): >> platform: Add __free() based cleanup function for >> platform_device_put >> >> Shiju Jose (10): >> EDAC: Add generic EDAC RAS control feature driver >> EDAC: Add EDAC scrub control driver >> EDAC: Add EDAC ECS control driver >> cxl/mbox: Add GET_SUPPORTED_FEATURES mailbox command >> cxl/mbox: Add GET_FEATURE mailbox command >> cxl/mbox: Add SET_FEATURE mailbox command >> cxl/memscrub: Add CXL memory device patrol scrub control feature >> cxl/memscrub: Add CXL memory device ECS control feature >> ACPI:RAS2: Add ACPI RAS2 driver >> ras: scrub: ACPI RAS2: Add memory ACPI RAS2 driver >> >> Documentation/ABI/testing/sysfs-edac-ecs | 85 ++ >> Documentation/ABI/testing/sysfs-edac-scrub | 76 ++ >> Documentation/scrub/edac-scrub.rst | 115 +++ >> drivers/acpi/Kconfig | 10 + >> drivers/acpi/Makefile | 1 + >> drivers/acpi/ras2.c | 391 +++++++++ >> drivers/cxl/Kconfig | 19 + >> drivers/cxl/core/Makefile | 1 + >> drivers/cxl/core/mbox.c | 139 ++++ >> drivers/cxl/core/memscrub.c | 873 +++++++++++++++++++++ >> drivers/cxl/core/region.c | 6 + >> drivers/cxl/cxlmem.h | 129 +++ >> drivers/cxl/mem.c | 4 + >> drivers/edac/Makefile | 1 + >> drivers/edac/edac_ecs.c | 396 ++++++++++ >> drivers/edac/edac_ras_feature.c | 187 +++++ >> drivers/edac/edac_scrub.c | 333 ++++++++ >> drivers/ras/Kconfig | 10 + >> drivers/ras/Makefile | 1 + >> drivers/ras/acpi_ras2.c | 415 ++++++++++ >> include/acpi/ras2_acpi.h | 59 ++ >> include/linux/edac_ras_feature.h | 132 ++++ >> include/linux/platform_device.h | 1 + >> 23 files changed, 3384 insertions(+) >> create mode 100644 Documentation/ABI/testing/sysfs-edac-ecs >> create mode 100644 Documentation/ABI/testing/sysfs-edac-scrub >> create mode 100644 Documentation/scrub/edac-scrub.rst >> create mode 100755 drivers/acpi/ras2.c create mode 100644 >> drivers/cxl/core/memscrub.c create mode 100755 >> drivers/edac/edac_ecs.c create mode 100755 >> drivers/edac/edac_ras_feature.c create mode 100755 >> drivers/edac/edac_scrub.c create mode 100644 drivers/ras/acpi_ras2.c >> create mode 100644 include/acpi/ras2_acpi.h create mode 100755 >> include/linux/edac_ras_feature.h >> >> -- >> 2.34.1 >>
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