linux-kernel - [PATCH AUTOSEL 6.6 37/58] remoteproc: imx_rproc: Use imx specific hook for find_loaded_rsc

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Message-ID: <20241004182503.3672477-37-sashal@kernel.org>
Date: Fri,  4 Oct 2024 14:24:10 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Peng Fan <peng.fan@....com>,
	Iuliana Prodan <iuliana.prodan@....com>,
	Daniel Baluta <daniel.baluta@....com>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Sasha Levin <sashal@...nel.org>,
	andersson@...nel.org,
	shawnguo@...nel.org,
	linux-remoteproc@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.6 37/58] remoteproc: imx_rproc: Use imx specific hook for find_loaded_rsc_table

From: Peng Fan <peng.fan@....com>

[ Upstream commit e954a1bd16102abc800629f9900715d8ec4c3130 ]

If there is a resource table device tree node, use the address as
the resource table address, otherwise use the address(where
.resource_table section loaded) inside the Cortex-M elf file.

And there is an update in NXP SDK that Resource Domain Control(RDC)
enabled to protect TCM, linux not able to write the TCM space when
updating resource table status and cause kernel dump. So use the address
from device tree could avoid kernel dump.

Note: NXP M4 SDK not check resource table update, so it does not matter
use whether resource table address specified in elf file or in device
tree. But to reflect the fact that if people specific resource table
address in device tree, it means people are aware and going to use it,
not the address specified in elf file.

Reviewed-by: Iuliana Prodan <iuliana.prodan@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
Reviewed-by: Daniel Baluta <daniel.baluta@....com>
Link: https://lore.kernel.org/r/20240719-imx_rproc-v2-2-10d0268c7eb1@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/remoteproc/imx_rproc.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index cfee164dd645c..db281b7a38b3d 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -669,6 +669,17 @@ static struct resource_table *imx_rproc_get_loaded_rsc_table(struct rproc *rproc
 	return (struct resource_table *)priv->rsc_table;
 }
 
+static struct resource_table *
+imx_rproc_elf_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
+{
+	struct imx_rproc *priv = rproc->priv;
+
+	if (priv->rsc_table)
+		return (struct resource_table *)priv->rsc_table;
+
+	return rproc_elf_find_loaded_rsc_table(rproc, fw);
+}
+
 static const struct rproc_ops imx_rproc_ops = {
 	.prepare	= imx_rproc_prepare,
 	.attach		= imx_rproc_attach,
@@ -679,7 +690,7 @@ static const struct rproc_ops imx_rproc_ops = {
 	.da_to_va       = imx_rproc_da_to_va,
 	.load		= rproc_elf_load_segments,
 	.parse_fw	= imx_rproc_parse_fw,
-	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
+	.find_loaded_rsc_table = imx_rproc_elf_find_loaded_rsc_table,
 	.get_loaded_rsc_table = imx_rproc_get_loaded_rsc_table,
 	.sanity_check	= rproc_elf_sanity_check,
 	.get_boot_addr	= rproc_elf_get_boot_addr,
-- 
2.43.0