[PATCH] cxl: Provide debugfs access to PSL_DEBUG/XSL_DEBUG registers

[Vaibhav Jain]

Access to PSL/XSL_DEBUG registers on the adapter provides easy access
to the debug facilities provided by PSL/XSL. So this patch adds two
new files (debug, xsl-debug) to the cxl-adapter specific debugfs
folder located at /sys/kernel/debugfs/cxl/card<n>, which will provide
direct r/w access to corrosponding debug registers in the adapter
config-space.

Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
---
 drivers/misc/cxl/cxl.h     | 1 +
 drivers/misc/cxl/debugfs.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index b1afeccbb97f..2c10b536427a 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -100,6 +100,7 @@ static const cxl_p1_reg_t CXL_XSL_FEC       = {0x0158};
 static const cxl_p1_reg_t CXL_XSL_DSNCTL    = {0x0168};
 /* PSL registers - CAIA 2 */
 static const cxl_p1_reg_t CXL_PSL9_CONTROL  = {0x0020};
+static const cxl_p1_reg_t CXL_XSL9_DBG      = {0x0130};
 static const cxl_p1_reg_t CXL_XSL9_DSNCTL   = {0x0168};
 static const cxl_p1_reg_t CXL_PSL9_FIR1     = {0x0300};
 static const cxl_p1_reg_t CXL_PSL9_FIR2     = {0x0308};
diff --git a/drivers/misc/cxl/debugfs.c b/drivers/misc/cxl/debugfs.c
index eae9d749f967..10ff569c1272 100644
--- a/drivers/misc/cxl/debugfs.c
+++ b/drivers/misc/cxl/debugfs.c
@@ -65,6 +65,10 @@ void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir)
 	debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR2));
 	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)
-- 
2.13.5