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

1 files changed, 0 insertions, 134 deletions

diff --git a/drivers/misc/cxl/debugfs.c b/drivers/misc/cxl/debugfs.c
deleted file mode 100644
index 7b987bf498b5..000000000000
--- a/drivers/misc/cxl/debugfs.c
+++ /dev/null
@@ -1,134 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2014 IBM Corp.
- */
-
-#include <linux/debugfs.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-
-#include "cxl.h"
-
-static struct dentry *cxl_debugfs;
-
-/* Helpers to export CXL mmaped IO registers via debugfs */
-static int debugfs_io_u64_get(void *data, u64 *val)
-{
-	*val = in_be64((u64 __iomem *)data);
-	return 0;
-}
-
-static int debugfs_io_u64_set(void *data, u64 val)
-{
-	out_be64((u64 __iomem *)data, val);
-	return 0;
-}
-DEFINE_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
-			 "0x%016llx\n");
-
-static void debugfs_create_io_x64(const char *name, umode_t mode,
-				  struct dentry *parent, u64 __iomem *value)
-{
-	debugfs_create_file_unsafe(name, mode, parent, (void __force *)value,
-				   &fops_io_x64);
-}
-
-void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir)
-{
-	debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR1));
-	debugfs_create_io_x64("fir_mask", 0400, dir,
-			      _cxl_p1_addr(adapter, CXL_PSL9_FIR_MASK));
-	debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR_CNTL));
-	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_TRACECFG));
-	debugfs_create_io_x64("debug", 0600, dir,
-			      _cxl_p1_addr(adapter, CXL_PSL9_DEBUG));
-	debugfs_create_io_x64("xsl-debug", 0600, dir,
-			      _cxl_p1_addr(adapter, CXL_XSL9_DBG));
-}
-
-void cxl_debugfs_add_adapter_regs_psl8(struct cxl *adapter, struct dentry *dir)
-{
-	debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
-	debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
-	debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
-	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
-}
-
-void cxl_debugfs_adapter_add(struct cxl *adapter)
-{
-	struct dentry *dir;
-	char buf[32];
-
-	if (!cxl_debugfs)
-		return;
-
-	snprintf(buf, 32, "card%i", adapter->adapter_num);
-	dir = debugfs_create_dir(buf, cxl_debugfs);
-	adapter->debugfs = dir;
-
-	debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
-
-	if (adapter->native->sl_ops->debugfs_add_adapter_regs)
-		adapter->native->sl_ops->debugfs_add_adapter_regs(adapter, dir);
-}
-
-void cxl_debugfs_adapter_remove(struct cxl *adapter)
-{
-	debugfs_remove_recursive(adapter->debugfs);
-}
-
-void cxl_debugfs_add_afu_regs_psl9(struct cxl_afu *afu, struct dentry *dir)
-{
-	debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
-}
-
-void cxl_debugfs_add_afu_regs_psl8(struct cxl_afu *afu, struct dentry *dir)
-{
-	debugfs_create_io_x64("sstp0", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
-	debugfs_create_io_x64("sstp1", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
-
-	debugfs_create_io_x64("fir", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_FIR_SLICE_An));
-	debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
-	debugfs_create_io_x64("afu_debug", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_AFU_DEBUG_An));
-	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
-}
-
-void cxl_debugfs_afu_add(struct cxl_afu *afu)
-{
-	struct dentry *dir;
-	char buf[32];
-
-	if (!afu->adapter->debugfs)
-		return;
-
-	snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
-	dir = debugfs_create_dir(buf, afu->adapter->debugfs);
-	afu->debugfs = dir;
-
-	debugfs_create_io_x64("sr",         S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
-	debugfs_create_io_x64("dsisr",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DSISR_An));
-	debugfs_create_io_x64("dar",        S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DAR_An));
-
-	debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
-
-	if (afu->adapter->native->sl_ops->debugfs_add_afu_regs)
-		afu->adapter->native->sl_ops->debugfs_add_afu_regs(afu, dir);
-}
-
-void cxl_debugfs_afu_remove(struct cxl_afu *afu)
-{
-	debugfs_remove_recursive(afu->debugfs);
-}
-
-void __init cxl_debugfs_init(void)
-{
-	if (!cpu_has_feature(CPU_FTR_HVMODE))
-		return;
-
-	cxl_debugfs = debugfs_create_dir("cxl", NULL);
-}
-
-void cxl_debugfs_exit(void)
-{
-	debugfs_remove_recursive(cxl_debugfs);
-}