linux-kernel - [PATCH v3 2/7] remoteproc: Extract the firmware load from the start

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Date: Wed, 14 Feb 2024 18:21:22 +0100
From: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier
	<mathieu.poirier@...aro.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <op-tee@...ts.trustedfirmware.org>, <devicetree@...r.kernel.org>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v3 2/7] remoteproc: Extract the firmware load from the start

With the introduction of tee_remoteproc, the firmware has to be loaded
first before parsing the resource table. This constraint is linked to
the firmware authentication, that contains the resource table.
In OP-TEE, this authentication is correlated with the load of the
firmware (the loaded segments authenticated after being copied
to the destination memory). Removing rproc_load_segments will allow
it to be called earlier in the boot sequence.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/remoteproc/remoteproc_core.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 695cce218e8c..283ca071e35c 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1269,13 +1269,6 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
 	struct device *dev = &rproc->dev;
 	int ret;
 
-	/* load the ELF segments to memory */
-	ret = rproc_load_segments(rproc, fw);
-	if (ret) {
-		dev_err(dev, "Failed to load program segments: %d\n", ret);
-		return ret;
-	}
-
 	/*
 	 * The starting device has been given the rproc->cached_table as the
 	 * resource table. The address of the vring along with the other
@@ -1430,6 +1423,13 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 		goto clean_up_resources;
 	}
 
+	/* load the ELF segments to memory */
+	ret = rproc_load_segments(rproc, fw);
+	if (ret) {
+		dev_err(dev, "Failed to load program segments: %d\n", ret);
+		return ret;
+	}
+
 	ret = rproc_start(rproc, fw);
 	if (ret)
 		goto clean_up_resources;
@@ -1808,6 +1808,13 @@ static int rproc_boot_recovery(struct rproc *rproc)
 		return ret;
 	}
 
+	/* load the ELF segments to memory */
+	ret = rproc_load_segments(rproc, firmware_p);
+	if (ret) {
+		dev_err(dev, "Failed to load program segments: %d\n", ret);
+		return ret;
+	}
+
 	/* boot the remote processor up again */
 	ret = rproc_start(rproc, firmware_p);
 
-- 
2.25.1