Merge tag 'edac_updates_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras

Pull EDAC updates from Borislav Petkov:

 - imh_edac: Add a new EDAC driver for Intel Diamond Rapids and future
   incarnations of this memory controllers architecture

 - amd64_edac: Remove the legacy csrow sysfs interface which has been
   deprecated and unused (we assume) for at least a decade

 - Add the capability to fallback to BIOS-provided address translation
   functionality (ACPI PRM) which can be used on systems unsupported by
   the current AMD address translation library

 - The usual fixes, fixlets, cleanups and improvements all over the
   place

* tag 'edac_updates_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
  RAS/AMD/ATL: Replace bitwise_xor_bits() with hweight16()
  EDAC/igen6: Fix error handling in igen6_edac driver
  EDAC/imh: Setup 'imh_test' debugfs testing node
  EDAC/{skx_comm,imh}: Detect 2-level memory configuration
  EDAC/skx_common: Extend the maximum number of DRAM chip row bits
  EDAC/{skx_common,imh}: Add EDAC driver for Intel Diamond Rapids servers
  EDAC/skx_common: Prepare for skx_set_hi_lo()
  EDAC/skx_common: Prepare for skx_get_edac_list()
  EDAC/{skx_common,skx,i10nm}: Make skx_register_mci() independent of pci_dev
  EDAC/ghes: Replace deprecated strcpy() in ghes_edac_report_mem_error()
  EDAC/ie31200: Fix error handling in ie31200_register_mci
  RAS/CEC: Replace use of system_wq with system_percpu_wq
  EDAC: Remove the legacy EDAC sysfs interface
  EDAC/amd64: Remove NUM_CONTROLLERS macro
  EDAC/amd64: Generate ctl_name string at runtime
  RAS/AMD/ATL: Require PRM support for future systems
  ACPI: PRM: Add acpi_prm_handler_available()
  RAS/AMD/ATL: Return error codes from helper functions

Author: torvalds

Documentation/admin-guide/RAS/main.rst

@@ -406,24 +406,8 @@ index of the MC::
 		   |->mc2
 		   ....
 
-Under each ``mcX`` directory each ``csrowX`` is again represented by a
-``csrowX``, where ``X`` is the csrow index::
-
-	.../mc/mc0/
-		|
-		|->csrow0
-		|->csrow2
-		|->csrow3
-		....
-
-Notice that there is no csrow1, which indicates that csrow0 is composed
-of a single ranked DIMMs. This should also apply in both Channels, in
-order to have dual-channel mode be operational. Since both csrow2 and
-csrow3 are populated, this indicates a dual ranked set of DIMMs for
-channels 0 and 1.
-
-Within each of the ``mcX`` and ``csrowX`` directories are several EDAC
-control and attribute files.
+Within each of the ``mcX`` directory are several EDAC control and
+attribute files.
 
 ``mcX`` directories
 -------------------
@@ -569,134 +553,14 @@ this ``X`` memory module:
 		- Unbuffered-DDR
 
 .. [#f5] On some systems, the memory controller doesn't have any logic
-  to identify the memory module. On such systems, the directory is called ``rankX`` and works on a similar way as the ``csrowX`` directories.
+  to identify the memory module. On such systems, the directory is called ``rankX``.
   On modern Intel memory controllers, the memory controller identifies the
   memory modules directly. On such systems, the directory is called ``dimmX``.
 
 .. [#f6] There are also some ``power`` directories and ``subsystem``
   symlinks inside the sysfs mapping that are automatically created by
   the sysfs subsystem. Currently, they serve no purpose.
 
-``csrowX`` directories
-----------------------
-
-When CONFIG_EDAC_LEGACY_SYSFS is enabled, sysfs will contain the ``csrowX``
-directories. As this API doesn't work properly for Rambus, FB-DIMMs and
-modern Intel Memory Controllers, this is being deprecated in favor of
-``dimmX`` directories.
-
-In the ``csrowX`` directories are EDAC control and attribute files for
-this ``X`` instance of csrow:
-
-
-- ``ue_count`` - Total Uncorrectable Errors count attribute file
-
-	This attribute file displays the total count of uncorrectable
-	errors that have occurred on this csrow. If panic_on_ue is set
-	this counter will not have a chance to increment, since EDAC
-	will panic the system.
-
-
-- ``ce_count`` - Total Correctable Errors count attribute file
-
-	This attribute file displays the total count of correctable
-	errors that have occurred on this csrow. This count is very
-	important to examine. CEs provide early indications that a
-	DIMM is beginning to fail. This count field should be
-	monitored for non-zero values and report such information
-	to the system administrator.
-
-
-- ``size_mb`` - Total memory managed by this csrow attribute file
-
-	This attribute file displays, in count of megabytes, the memory
-	that this csrow contains.
-
-
-- ``mem_type`` - Memory Type attribute file
-
-	This attribute file will display what type of memory is currently
-	on this csrow. Normally, either buffered or unbuffered memory.
-	Examples:
-
-		- Registered-DDR
-		- Unbuffered-DDR
-
-
-- ``edac_mode`` - EDAC Mode of operation attribute file
-
-	This attribute file will display what type of Error detection
-	and correction is being utilized.
-
-
-- ``dev_type`` - Device type attribute file
-
-	This attribute file will display what type of DRAM device is
-	being utilized on this DIMM.
-	Examples:
-
-		- x1
-		- x2
-		- x4
-		- x8
-
-
-- ``ch0_ce_count`` - Channel 0 CE Count attribute file
-
-	This attribute file will display the count of CEs on this
-	DIMM located in channel 0.
-
-
-- ``ch0_ue_count`` - Channel 0 UE Count attribute file
-
-	This attribute file will display the count of UEs on this
-	DIMM located in channel 0.
-
-
-- ``ch0_dimm_label`` - Channel 0 DIMM Label control file
-
-
-	This control file allows this DIMM to have a label assigned
-	to it. With this label in the module, when errors occur
-	the output can provide the DIMM label in the system log.
-	This becomes vital for panic events to isolate the
-	cause of the UE event.
-
-	DIMM Labels must be assigned after booting, with information
-	that correctly identifies the physical slot with its
-	silk screen label. This information is currently very
-	motherboard specific and determination of this information
-	must occur in userland at this time.
-
-
-- ``ch1_ce_count`` - Channel 1 CE Count attribute file
-
-
-	This attribute file will display the count of CEs on this
-	DIMM located in channel 1.
-
-
-- ``ch1_ue_count`` - Channel 1 UE Count attribute file
-
-
-	This attribute file will display the count of UEs on this
-	DIMM located in channel 0.
-
-
-- ``ch1_dimm_label`` - Channel 1 DIMM Label control file
-
-	This control file allows this DIMM to have a label assigned
-	to it. With this label in the module, when errors occur
-	the output can provide the DIMM label in the system log.
-	This becomes vital for panic events to isolate the
-	cause of the UE event.
-
-	DIMM Labels must be assigned after booting, with information
-	that correctly identifies the physical slot with its
-	silk screen label. This information is currently very
-	motherboard specific and determination of this information
-	must occur in userland at this time.
-
 
 System Logging
 --------------

arch/loongarch/configs/loongson3_defconfig

@@ -917,7 +917,6 @@ CONFIG_MMC=y
 CONFIG_MMC_LOONGSON2=m
 CONFIG_INFINIBAND=m
 CONFIG_EDAC=y
-# CONFIG_EDAC_LEGACY_SYSFS is not set
 CONFIG_EDAC_LOONGSON=y
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_EFI=y

drivers/acpi/prmt.c

@@ -244,6 +244,12 @@ static struct prm_handler_info *find_prm_handler(const guid_t *guid)
 	return (struct prm_handler_info *) find_guid_info(guid, GET_HANDLER);
 }
 
+bool acpi_prm_handler_available(const guid_t *guid)
+{
+	return find_prm_handler(guid) && find_prm_module(guid);
+}
+EXPORT_SYMBOL_GPL(acpi_prm_handler_available);
+
 /* In-coming PRM commands */
 
 #define PRM_CMD_RUN_SERVICE		0

drivers/edac/Kconfig

@@ -23,14 +23,6 @@ menuconfig EDAC
 
 if EDAC
 
-config EDAC_LEGACY_SYSFS
-	bool "EDAC legacy sysfs"
-	default y
-	help
-	  Enable the compatibility sysfs nodes.
-	  Use 'Y' if your edac utilities aren't ported to work with the newer
-	  structures.
-
 config EDAC_DEBUG
 	bool "Debugging"
 	select DEBUG_FS
@@ -291,6 +283,18 @@ config EDAC_I10NM
 	  system has non-volatile DIMMs you should also manually
 	  select CONFIG_ACPI_NFIT.
 
+config EDAC_IMH
+	tristate "Intel Integrated Memory/IO Hub MC"
+	depends on X86_64 && X86_MCE_INTEL && ACPI
+	depends on ACPI_NFIT || !ACPI_NFIT # if ACPI_NFIT=m, EDAC_IMH can't be y
+	select DMI
+	select ACPI_ADXL
+	help
+	  Support for error detection and correction the Intel
+	  Integrated Memory/IO Hub Memory Controller. This MC IP is
+	  first used on the Diamond Rapids servers but may appear on
+	  others in the future.
+
 config EDAC_PND2
 	tristate "Intel Pondicherry2"
 	depends on PCI && X86_64 && X86_MCE_INTEL

drivers/edac/Makefile

@@ -65,6 +65,9 @@ obj-$(CONFIG_EDAC_SKX)			+= skx_edac.o skx_edac_common.o
 i10nm_edac-y				:= i10nm_base.o
 obj-$(CONFIG_EDAC_I10NM)		+= i10nm_edac.o skx_edac_common.o
 
+imh_edac-y				:= imh_base.o
+obj-$(CONFIG_EDAC_IMH)			+= imh_edac.o skx_edac_common.o
+
 obj-$(CONFIG_EDAC_HIGHBANK_MC)		+= highbank_mc_edac.o
 obj-$(CONFIG_EDAC_HIGHBANK_L2)		+= highbank_l2_edac.o