From ffae3e9c310f7963c3158d5bf9bd2eec9c4d8c55 Mon Sep 17 00:00:00 2001
From: Mikko Perttunen <mperttunen@nvidia.com>
Date: Mon, 27 Jun 2022 17:20:07 +0300
Subject: gpu: host1x: Use RESTART_W to skip timed out jobs on Tegra186+
Git-commit: 0ae4ae9158f32fd77e8736da0585d8aff5a3b9d9
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

When MLOCK enforcement is enabled, the 0-word write currently done
is rejected by the hardware outside of an MLOCK region. As such,
on these chips, which also have the newer, more convenient RESTART_W
opcode, use that instead to skip over the timed out job.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/host1x/cdma.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/host1x/cdma.c b/drivers/gpu/host1x/cdma.c
index 765e5aa64eb6..bb1f3c746be4 100644
--- a/drivers/gpu/host1x/cdma.c
+++ b/drivers/gpu/host1x/cdma.c
@@ -457,9 +457,24 @@ void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
 				 * to offset 0xbad. This does nothing but
 				 * has a easily detected signature in debug
 				 * traces.
+				 *
+				 * On systems with MLOCK enforcement enabled,
+				 * the above 0 word writes would fall foul of
+				 * the enforcement. As such, in the first slot
+				 * put a RESTART_W opcode to the beginning
+				 * of the next job. We don't use this for older
+				 * chips since those only support the RESTART
+				 * opcode with inconvenient alignment requirements.
 				 */
-				mapped[2*slot+0] = 0x1bad0000;
-				mapped[2*slot+1] = 0x1bad0000;
+				if (i == 0 && host1x->info->has_wide_gather) {
+					unsigned int next_job = (job->first_get/8 + job->num_slots)
+						% HOST1X_PUSHBUFFER_SLOTS;
+					mapped[2*slot+0] = (0xd << 28) | (next_job * 2);
+					mapped[2*slot+1] = 0x0;
+				} else {
+					mapped[2*slot+0] = 0x1bad0000;
+					mapped[2*slot+1] = 0x1bad0000;
+				}
 			}
 
 			job->cancelled = true;
-- 
2.38.1