FAILED: patch "[PATCH] drm/xe/oa: (De-)whitelist OA registers on OA stream" failed to apply to 6.18-stable tree

The patch below does not apply to the 6.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x f8e6874f46f19a6a2a0f24a81689f90641bb402a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026090935-collapse-renegade-7f7f@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f8e6874f46f19a6a2a0f24a81689f90641bb402a Mon Sep 17 00:00:00 2001
From: Ashutosh Dixit <[email protected]>
Date: Mon, 15 Jun 2026 15:42:26 -0700
Subject: [PATCH] drm/xe/oa: (De-)whitelist OA registers on OA stream
open/release

Whitelist OA registers on stream open and de-whitelist on stream close/release. Whitelisting is only done when 'stream->sample' is true. 'stream->sample' is only true when (a) xe_observation_paranoid is set to false by system admin, or (b) the process is perfmon_capable(). This therefore enforces the OA register whitelisting security requirements.

index 9fbd21b0ef97..b3acbcd678b7 100644
@@ -37,6 +37,7 @@
 #include "xe_oa.h"
 #include "xe_observation.h"
 #include "xe_pm.h"
+#include "xe_reg_whitelist.h"
 #include "xe_sched_job.h"
 #include "xe_sriov.h"
 #include "xe_sync.h"

@@ -885,6 +886,9 @@ static void xe_oa_stream_destroy(struct xe_oa_stream *stream)
 
 	mutex_destroy(&stream->stream_lock);
 
+	if (stream->sample)
+		xe_reg_dewhitelist_oa_regs(stream->gt);
+
 	xe_oa_disable_metric_set(stream);
 	xe_exec_queue_put(stream->k_exec_q);
 

@@ -1886,6 +1890,9 @@ static int xe_oa_stream_open_ioctl_locked(struct xe_oa *oa,
 		goto err_disable;
 	}
 
+	if (stream->sample)
+		xe_reg_whitelist_oa_regs(stream->gt);
+
 	/* Hold a reference on the drm device till stream_fd is released */
 	drm_dev_get(&stream->oa->xe->drm);