drm/xe/rtp: Keep track of non-OA nonpriv slots

In order to dynamically whitelist/dewhitelist OA registers on OA stream
open/close, we need to keep track of nonpriv slots occupied by non-OA
register whitelists.

Fixes: 828a8eaf37c3 ("drm/xe/oa: Add MMIO trigger support")
Cc: stable@vger.kernel.org # v6.12+
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Link: https://patch.msgid.link/20260615224227.34880-4-ashutosh.dixit@intel.com
(cherry picked from commit 15739920b71ef3c56868973b4e7e3164a793d09d)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c
index 6d642c2f6fd7..b5ae7d26e5ba 100644
--- a/drivers/gpu/drm/xe/xe_reg_whitelist.c
+++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c
@@ -161,7 +161,7 @@ static const struct xe_rtp_table_sr oa_whitelist = XE_RTP_TABLE_SR(
 	},
 );
 
-static void whitelist_apply_to_hwe(struct xe_hw_engine *hwe)
+static int whitelist_apply_to_hwe(struct xe_hw_engine *hwe)
 {
 	struct xe_reg_sr *sr = &hwe->reg_whitelist;
 	struct xe_reg_sr_entry *entry;
@@ -193,6 +193,8 @@ static void whitelist_apply_to_hwe(struct xe_hw_engine *hwe)
 
 		slot++;
 	}
+
+	return slot;
 }
 
 /**
@@ -206,9 +208,10 @@ static void whitelist_apply_to_hwe(struct xe_hw_engine *hwe)
 void xe_reg_whitelist_process_engine(struct xe_hw_engine *hwe)
 {
 	struct xe_rtp_process_ctx ctx = XE_RTP_PROCESS_CTX_INITIALIZER(hwe);
+	int first_oa_slot;
 
 	xe_rtp_process_to_sr(&ctx, &register_whitelist, &hwe->reg_whitelist, false);
-	whitelist_apply_to_hwe(hwe);
+	first_oa_slot = whitelist_apply_to_hwe(hwe);
 
 	xe_rtp_process_to_sr(&ctx, &oa_whitelist, &hwe->oa_whitelist, false);
 }