[PATCH 6.18.y 07/10] drm/xe/rtp: Toggle 'deny' bit to (de-)whitelist OA regs

[Ashutosh Dixit <ashutosh.dixit@intel.com>]

[ Upstream commit aeaa7d2bb017272ab9e18759fe00bf758cd3299f ]

Whitelist or de-whitelist OA registers by setting or resetting the 'deny'
bit in OA nonpriv registers and writing new register values to HW.

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/20260615224227.34880-7-ashutosh.dixit@intel.com
---
 drivers/gpu/drm/xe/xe_reg_whitelist.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c
index 4f7391d787fb0..4922b3561dbf4 100644
--- a/drivers/gpu/drm/xe/xe_reg_whitelist.c
+++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c
@@ -161,6 +161,21 @@ void xe_reg_whitelist_process_engine(struct xe_hw_engine *hwe)
 	whitelist_apply_to_hwe(hwe, &hwe->oa_whitelist, &hwe->reg_sr, first_oa_slot);
 }
 
+__maybe_unused static void __whitelist_oa_regs(struct xe_hw_engine *hwe, bool whitelist)
+{
+	struct xe_reg_sr_entry *entry;
+	unsigned long reg;
+
+	xa_for_each(&hwe->oa_sr.xa, reg, entry) {
+		if (whitelist)
+			entry->set_bits &= ~RING_FORCE_TO_NONPRIV_DENY;
+		else
+			entry->set_bits |= RING_FORCE_TO_NONPRIV_DENY;
+	}
+
+	xe_reg_sr_apply_mmio(&hwe->oa_sr, hwe->gt);
+}
+
 /**
  * xe_reg_whitelist_print_entry - print one whitelist entry
  * @p: DRM printer
-- 
2.54.0