cxl: Remove driver

Remove the cxl driver that provides support for the IBM Coherent
Accelerator Processor Interface. Revert or clean up associated code in
arch/powerpc that is no longer necessary.

cxl has received minimal maintenance for several years, and is not
supported on the Power10 processor. We aren't aware of any users who are
likely to be using recent kernels.

Thanks to Mikey Neuling, Ian Munsie, Daniel Axtens, Frederic Barrat,
Christophe Lombard, Philippe Bergheaud, Vaibhav Jain and Alastair
D'Silva for their work on this driver over the years.

Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20250219070007.177725-2-ajd@linux.ibm.com

Author: ajdlinux

Documentation/ABI/obsolete/sysfs-class-cxl renamed to Documentation/ABI/removed/sysfs-class-cxl

@@ -1,5 +1,4 @@
-The cxl driver is no longer maintained, and will be removed from the kernel in
-the near future.
+The cxl driver was removed in 6.14.
 
 Please note that attributes that are shared between devices are stored in
 the directory pointed to by the symlink device/.
@@ -10,7 +9,7 @@ For example, the real path of the attribute /sys/class/cxl/afu0.0s/irqs_max is
 Slave contexts (eg. /sys/class/cxl/afu0.0s):
 
 What:           /sys/class/cxl/<afu>/afu_err_buf
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 AFU Error Buffer contents. The contents of this file are
@@ -21,7 +20,7 @@ Description:    read only
 
 
 What:           /sys/class/cxl/<afu>/irqs_max
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read/write
                 Decimal value of maximum number of interrupts that can be
@@ -32,7 +31,7 @@ Description:    read/write
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/irqs_min
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Decimal value of the minimum number of interrupts that
@@ -42,23 +41,23 @@ Description:    read only
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/mmio_size
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Decimal value of the size of the MMIO space that may be mmapped
                 by userspace.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/modes_supported
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 List of the modes this AFU supports. One per line.
                 Valid entries are: "dedicated_process" and "afu_directed"
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/mode
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read/write
                 The current mode the AFU is using. Will be one of the modes
@@ -68,7 +67,7 @@ Users:		https://github.com/ibm-capi/libcxl
 
 
 What:           /sys/class/cxl/<afu>/prefault_mode
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read/write
                 Set the mode for prefaulting in segments into the segment table
@@ -88,22 +87,22 @@ Description:    read/write
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/reset
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    write only
                 Writing 1 here will reset the AFU provided there are not
                 contexts active on the AFU.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/api_version
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Decimal value of the current version of the kernel/user API.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/api_version_compatible
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Decimal value of the lowest version of the userspace API
@@ -117,31 +116,31 @@ An AFU may optionally export one or more PCIe like configuration records, known
 as AFU configuration records, which will show up here (if present).
 
 What:           /sys/class/cxl/<afu>/cr<config num>/vendor
-Date:           February 2015
+Date:           February 2015, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
 		Hexadecimal value of the vendor ID found in this AFU
 		configuration record.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/cr<config num>/device
-Date:           February 2015
+Date:           February 2015, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
 		Hexadecimal value of the device ID found in this AFU
 		configuration record.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/cr<config num>/class
-Date:           February 2015
+Date:           February 2015, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
 		Hexadecimal value of the class code found in this AFU
 		configuration record.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>/cr<config num>/config
-Date:           February 2015
+Date:           February 2015, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
 		This binary file provides raw access to the AFU configuration
@@ -155,22 +154,22 @@ Users:		https://github.com/ibm-capi/libcxl
 Master contexts (eg. /sys/class/cxl/afu0.0m)
 
 What:           /sys/class/cxl/<afu>m/mmio_size
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Decimal value of the size of the MMIO space that may be mmapped
                 by userspace. This includes all slave contexts space also.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>m/pp_mmio_len
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Decimal value of the Per Process MMIO space length.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<afu>m/pp_mmio_off
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 (not in a guest)
@@ -181,21 +180,21 @@ Users:		https://github.com/ibm-capi/libcxl
 Card info (eg. /sys/class/cxl/card0)
 
 What:           /sys/class/cxl/<card>/caia_version
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Identifies the CAIA Version the card implements.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/psl_revision
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Identifies the revision level of the PSL.
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/base_image
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 (not in a guest)
@@ -206,7 +205,7 @@ Description:    read only
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/image_loaded
-Date:           September 2014
+Date:           September 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 (not in a guest)
@@ -215,7 +214,7 @@ Description:    read only
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/load_image_on_perst
-Date:           December 2014
+Date:           December 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read/write
                 (not in a guest)
@@ -232,7 +231,7 @@ Description:    read/write
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/reset
-Date:           October 2014
+Date:           October 2014, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    write only
                 Writing 1 will issue a PERST to card provided there are no
@@ -243,7 +242,7 @@ Description:    write only
 Users:		https://github.com/ibm-capi/libcxl
 
 What:		/sys/class/cxl/<card>/perst_reloads_same_image
-Date:		July 2015
+Date:		July 2015, removed February 2025
 Contact:	linuxppc-dev@lists.ozlabs.org
 Description:	read/write
                 (not in a guest)
@@ -257,15 +256,15 @@ Description:	read/write
 Users:		https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/psl_timebase_synced
-Date:           March 2016
+Date:           March 2016, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Returns 1 if the psl timebase register is synchronized
                 with the core timebase register, 0 otherwise.
 Users:          https://github.com/ibm-capi/libcxl
 
 What:           /sys/class/cxl/<card>/tunneled_ops_supported
-Date:           May 2018
+Date:           May 2018, removed February 2025
 Contact:        linuxppc-dev@lists.ozlabs.org
 Description:    read only
                 Returns 1 if tunneled operations are supported in capi mode,