[PATCH v7 10/14] platform/x86/intel/pmt: Register enumeration functions with resctrl

[Tony Luck]

INTEL_PMT_TELEMETRY is a loadable module, but resctrl is built-in and cannot
call PMT functions directly.  Register the telemetry enumeration function
pointers at pmt_telemetry module init, and unregister them at module exit.

Note that checkpatch complains about the #include of <asm/resctrl.h>.
This is needed rather than <linux/resctrl.h> to get the function stub
definitions when CONFIG_X86_CPU_RESCTRL=n.

Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
 drivers/platform/x86/intel/pmt/telemetry.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
index bdc7c24a3678..33c1f8e7022f 100644
--- a/drivers/platform/x86/intel/pmt/telemetry.c
+++ b/drivers/platform/x86/intel/pmt/telemetry.c
@@ -25,6 +25,8 @@
 #include <linux/uaccess.h>
 #include <linux/xarray.h>
 
+#include <asm/resctrl.h>
+
 #include "class.h"
 
 #define TELEM_SIZE_OFFSET	0x0
@@ -425,12 +427,21 @@ static struct auxiliary_driver pmt_telem_aux_driver = {
 
 static int __init pmt_telem_init(void)
 {
-	return auxiliary_driver_register(&pmt_telem_aux_driver);
+	int ret;
+
+	ret = auxiliary_driver_register(&pmt_telem_aux_driver);
+	if (ret)
+		return ret;
+
+	intel_aet_register_enumeration(THIS_MODULE, intel_pmt_get_regions_by_feature,
+				       intel_pmt_put_feature_group);
+	return 0;
 }
 module_init(pmt_telem_init);
 
 static void __exit pmt_telem_exit(void)
 {
+	intel_aet_unregister_enumeration();
 	auxiliary_driver_unregister(&pmt_telem_aux_driver);
 	xa_destroy(&telem_array);
 }
-- 
2.54.0