Mesa (main): panfrost: Add nocache debug flag for disabling the BO cache

[GitLab Mirror]

Module: Mesa
Branch: main
Commit: dab97fe227739781652564504a27ff6ea08fb98e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=dab97fe227739781652564504a27ff6ea08fb98e

Author: Icecream95 <ixn at disroot.org>
Date:   Sat Aug 14 23:45:52 2021 +1200

panfrost: Add nocache debug flag for disabling the BO cache

Useful for making execution more deterministic.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12378>

---

 src/gallium/drivers/panfrost/pan_screen.c | 1 +
 src/panfrost/lib/pan_bo.c                 | 2 +-
 src/panfrost/lib/pan_util.h               | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
index 3a55c272f77..5067a64dbad 100644
--- a/src/gallium/drivers/panfrost/pan_screen.c
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -70,6 +70,7 @@ static const struct debug_named_value panfrost_debug_options[] = {
         {"msaa16",    PAN_DBG_MSAA16,   "Enable MSAA 8x and 16x support"},
         {"noindirect", PAN_DBG_NOINDIRECT, "Emulate indirect draws on the CPU"},
         {"linear",    PAN_DBG_LINEAR,   "Force linear textures"},
+        {"nocache",   PAN_DBG_NO_CACHE, "Disable BO cache"},
         DEBUG_NAMED_VALUE_END
 };
 
diff --git a/src/panfrost/lib/pan_bo.c b/src/panfrost/lib/pan_bo.c
index 7e07c41cc32..033f06cc8e1 100644
--- a/src/panfrost/lib/pan_bo.c
+++ b/src/panfrost/lib/pan_bo.c
@@ -267,7 +267,7 @@ panfrost_bo_cache_put(struct panfrost_bo *bo)
 {
         struct panfrost_device *dev = bo->dev;
 
-        if (bo->flags & PAN_BO_SHARED)
+        if (bo->flags & PAN_BO_SHARED || dev->debug & PAN_DBG_NO_CACHE)
                 return false;
 
         pthread_mutex_lock(&dev->bo_cache.lock);
diff --git a/src/panfrost/lib/pan_util.h b/src/panfrost/lib/pan_util.h
index 439085950d7..3a13b5e11d5 100644
--- a/src/panfrost/lib/pan_util.h
+++ b/src/panfrost/lib/pan_util.h
@@ -41,6 +41,7 @@
 #define PAN_DBG_MSAA16          0x0400
 #define PAN_DBG_NOINDIRECT      0x0800
 #define PAN_DBG_LINEAR          0x1000
+#define PAN_DBG_NO_CACHE        0x2000
 
 unsigned
 panfrost_translate_swizzle_4(const unsigned char swizzle[4]);