[PATCH 7.1 424/438] drm/xe/oa: (De-)whitelist OA registers on OA stream open/release

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ashutosh Dixit <[email protected]>

[ Upstream commit 63ddb3ad08ff4e89c108499dfec5e9be5ddc25c9 ]

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.

Fixes: 828a8eaf37c3 ("drm/xe/oa: Add MMIO trigger support")
Cc: [email protected] # v6.12+
Signed-off-by: Ashutosh Dixit <[email protected]>
Reviewed-by: Umesh Nerlige Ramappa <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Sasha Levin <[email protected]>
---
 drivers/gpu/drm/xe/xe_oa.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c
index d908f4e039063..5111c6519c6db 100644
--- a/drivers/gpu/drm/xe/xe_oa.c
+++ b/drivers/gpu/drm/xe/xe_oa.c
@@ -35,6 +35,7 @@
 #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"
@@ -866,6 +867,9 @@ 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);
 
@@ -1871,6 +1875,9 @@ 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);
 
-- 
2.53.0