[PATCH 7.1.y 4/8] drm/xe/rtp: Save OA nonpriv registers to register save/restore lists

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

[ Upstream commit 3a3c3e56db2923daaf1a5353cd6463a4cdaf4ffa ]

Now we can save OA whitelisting nonpriv registers to register save/restore
lists. OA nonpriv registers are saved to both hwe->oa_sr as well as
hwe->reg_sr.

During probe, resume and gt-reset flows KMD will apply hwe->reg_sr,
ensuring OA registers are de-whitelisted after these events. For
engine-reset, hwe->reg_sr is registered with GuC and GuC will apply these
registers, ensuring OA registers are de-whitelisted after engine resets.

hwe->oa_sr is used for whitelisting or de-whitelisting OA registers during
OA operation, by toggling the 'deny' bit on oa stream open/close.

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/20260615224227.34880-6-ashutosh.dixit@intel.com
---
 drivers/gpu/drm/xe/xe_reg_whitelist.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c
index 1a7d69ef4fe82..dbaa387a35613 100644
--- a/drivers/gpu/drm/xe/xe_reg_whitelist.c
+++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c
@@ -203,6 +203,17 @@ void xe_reg_whitelist_process_engine(struct xe_hw_engine *hwe)
 
 	xe_rtp_process_to_sr(&ctx, oa_whitelist, ARRAY_SIZE(oa_whitelist),
 			     &hwe->oa_whitelist, false);
+	/*
+	 * Save oa nonpriv registers to hwe->oa_sr, from which oa registers are whitelisted
+	 * or de-whitelisted, by toggling the 'deny' bit on oa stream open/close
+	 */
+	whitelist_apply_to_hwe(hwe, &hwe->oa_whitelist, &hwe->oa_sr, first_oa_slot);
+
+	/*
+	 * Also save oa nonpriv registers to hwe->reg_sr, to ensure oa registers are not
+	 * whitelisted by default after probe, gt reset, resume and engine reset
+	 */
+	whitelist_apply_to_hwe(hwe, &hwe->oa_whitelist, &hwe->reg_sr, first_oa_slot);
 }
 
 /**
-- 
2.54.0