FAILED: patch "[PATCH] drm/i915/guc: Debug print LRC state entries only if the" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] drm/i915/guc: Debug print LRC state entries only if the" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-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 <stable@vger.kernel.org>.

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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 57965269896313e1629a518d3971ad55f599b792
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025021048-majority-stature-58b1@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 57965269896313e1629a518d3971ad55f599b792 Mon Sep 17 00:00:00 2001
From: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Date: Tue, 14 Jan 2025 16:13:34 -0800
Subject: [PATCH] drm/i915/guc: Debug print LRC state entries only if the
 context is pinned

After the context is unpinned the backing memory can also be unpinned,
so any accesses via the lrc_reg_state pointer can end up in unmapped
memory. To avoid that, make sure to only access that memory if the
context is pinned when printing its info.

v2: fix newline alignment

Fixes: 28ff6520a34d ("drm/i915/guc: Update GuC debugfs to support new GuC")
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: <stable@vger.kernel.org> # v5.15+
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250115001334.3875347-1-daniele.ceraolospurio@intel.com
(cherry picked from commit 5bea40687c5cf2a33bf04e9110eb2e2b80222ef5)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index bd4b3d2470e4..cc05bd9e43b4 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -5535,12 +5535,20 @@ static inline void guc_log_context(struct drm_printer *p,
 {
 	drm_printf(p, "GuC lrc descriptor %u:\n", ce->guc_id.id);
 	drm_printf(p, "\tHW Context Desc: 0x%08x\n", ce->lrc.lrca);
-	drm_printf(p, "\t\tLRC Head: Internal %u, Memory %u\n",
-		   ce->ring->head,
-		   ce->lrc_reg_state[CTX_RING_HEAD]);
-	drm_printf(p, "\t\tLRC Tail: Internal %u, Memory %u\n",
-		   ce->ring->tail,
-		   ce->lrc_reg_state[CTX_RING_TAIL]);
+	if (intel_context_pin_if_active(ce)) {
+		drm_printf(p, "\t\tLRC Head: Internal %u, Memory %u\n",
+			   ce->ring->head,
+			   ce->lrc_reg_state[CTX_RING_HEAD]);
+		drm_printf(p, "\t\tLRC Tail: Internal %u, Memory %u\n",
+			   ce->ring->tail,
+			   ce->lrc_reg_state[CTX_RING_TAIL]);
+		intel_context_unpin(ce);
+	} else {
+		drm_printf(p, "\t\tLRC Head: Internal %u, Memory not pinned\n",
+			   ce->ring->head);
+		drm_printf(p, "\t\tLRC Tail: Internal %u, Memory not pinned\n",
+			   ce->ring->tail);
+	}
 	drm_printf(p, "\t\tContext Pin Count: %u\n",
 		   atomic_read(&ce->pin_count));
 	drm_printf(p, "\t\tGuC ID Ref Count: %u\n",