linux-kernel - [PATCH 1/4] host1x: Store device address to all bufs

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Date:	Thu, 21 May 2015 16:20:22 +0300
From:	Arto Merilainen <amerilainen@...dia.com>
To:	thierry.reding@...il.com
CC:	linux-tegra@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, achew@...dia.com, srasal@...dia.com,
	dnibade@...dia.com
Subject: [PATCH 1/4] host1x: Store device address to all bufs

Currently job pinning is optimized to handle only the first buffer
using a certain host1x_bo object and all subsequent buffers using
the same host1x_bo are considered done.

In most cases this is correct, however, in case the same host1x_bo
is used in multiple gathers inside the same job, we skip also
storing the device address (physical or iova) to this buffer.

This patch reworks the host1x_job_pin() to store the device address
to all gathers.

Signed-off-by: Andrew Chew <achew@...dia.com>
Signed-off-by: Arto Merilainen <amerilainen@...dia.com>
---
 drivers/gpu/host1x/job.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
index 63bd63f3c7df..b72aa918fa69 100644
--- a/drivers/gpu/host1x/job.c
+++ b/drivers/gpu/host1x/job.c
@@ -1,7 +1,7 @@
 /*
  * Tegra host1x Job
  *
- * Copyright (c) 2010-2013, NVIDIA Corporation.
+ * Copyright (c) 2010-2015, NVIDIA Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -538,9 +538,12 @@ int host1x_job_pin(struct host1x_job *job, struct device *dev)
 
 		g->base = job->gather_addr_phys[i];
 
-		for (j = i + 1; j < job->num_gathers; j++)
-			if (job->gathers[j].bo == g->bo)
+		for (j = i + 1; j < job->num_gathers; j++) {
+			if (job->gathers[j].bo == g->bo) {
 				job->gathers[j].handled = true;
+				job->gathers[j].base = g->base;
+			}
+		}
 
 		err = do_relocs(job, g->bo);
 		if (err)
-- 
1.8.1.5

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