This is a note to let you know that I've just added the patch titled
drm/vc4: Fix termination of the initial scan for branch targets.
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-vc4-fix-termination-of-the-initial-scan-for-branch-targets.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 457e67a728696c4f8e6423c64e93def50530db9a Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@xxxxxxxxxx>
Date: Thu, 20 Oct 2016 16:48:12 -0700
Subject: drm/vc4: Fix termination of the initial scan for branch targets.
From: Eric Anholt <eric@xxxxxxxxxx>
commit 457e67a728696c4f8e6423c64e93def50530db9a upstream.
The loop is scanning until the original max_ip (size of the BO), but
we want to not examine any code after the PROG_END's delay slots.
There was a block trying to do that, except that we had some early
continue statements if the signal wasn't a PROG_END or a BRANCH.
The failure mode would be that a valid shader is rejected because some
undefined memory after the PROG_END slots is parsed as a branch and
the rest of its setup is illegal. I haven't seen this in the wild,
but valgrind was complaining when about this up in the userland
simulator mode.
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Cc: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_validate_shaders.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_validate_shaders.c
+++ b/drivers/gpu/drm/vc4/vc4_validate_shaders.c
@@ -608,9 +608,7 @@ static bool
vc4_validate_branches(struct vc4_shader_validation_state *validation_state)
{
uint32_t max_branch_target = 0;
- bool found_shader_end = false;
int ip;
- int shader_end_ip = 0;
int last_branch = -2;
for (ip = 0; ip < validation_state->max_ip; ip++) {
@@ -621,8 +619,13 @@ vc4_validate_branches(struct vc4_shader_
uint32_t branch_target_ip;
if (sig == QPU_SIG_PROG_END) {
- shader_end_ip = ip;
- found_shader_end = true;
+ /* There are two delay slots after program end is
+ * signaled that are still executed, then we're
+ * finished. validation_state->max_ip is the
+ * instruction after the last valid instruction in the
+ * program.
+ */
+ validation_state->max_ip = ip + 3;
continue;
}
@@ -676,15 +679,9 @@ vc4_validate_branches(struct vc4_shader_
}
set_bit(after_delay_ip, validation_state->branch_targets);
max_branch_target = max(max_branch_target, after_delay_ip);
-
- /* There are two delay slots after program end is signaled
- * that are still executed, then we're finished.
- */
- if (found_shader_end && ip == shader_end_ip + 2)
- break;
}
- if (max_branch_target > shader_end_ip) {
+ if (max_branch_target > validation_state->max_ip - 3) {
DRM_ERROR("Branch landed after QPU_SIG_PROG_END");
return false;
}
Patches currently in stable-queue which might be from eric@xxxxxxxxxx are
queue-4.9/drm-vc4-fix-termination-of-the-initial-scan-for-branch-targets.patch
queue-4.9/drm-vc4-use-runtime-autosuspend-to-avoid-thrashing-v3d-power-state.patch