linux-kernel - [PATCH 1/6] drm/v3d: Document cache flushing ABI.

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Message-Id: <20181201005759.28093-1-eric@anholt.net>
Date:   Fri, 30 Nov 2018 16:57:54 -0800
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        Dave Emett <david.emett@...adcom.com>,
        Thomas Spurden <thomas.spurden@...adcom.com>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 1/6] drm/v3d: Document cache flushing ABI.

Right now, userspace doesn't do any L2T writes, but we should lay out
our expectations for how it works.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 include/uapi/drm/v3d_drm.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
index 35c7d813c66e..95b8f8e82ea5 100644
--- a/include/uapi/drm/v3d_drm.h
+++ b/include/uapi/drm/v3d_drm.h
@@ -52,6 +52,13 @@ extern "C" {
  *
  * This asks the kernel to have the GPU execute an optional binner
  * command list, and a render command list.
+ *
+ * The caches (L1T, slice, and L2T) will be flushed before the job
+ * executes.  The TLB writes are guaranteed to have been flushed by
+ * the time the render done IRQ happens, which is the trigger for
+ * out_sync.  Any dirtying of cachelines by the job (only possible
+ * using TMU writes) must be flushed by the caller using the CL's
+ * cache flush commands.
  */
 struct drm_v3d_submit_cl {
 	/* Pointer to the binner command list.
-- 
2.20.0.rc1