linux-kernel - [RFC][PATCH 1/2] remoteproc: Reduce asynchronous request

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Date:   Tue, 24 Jan 2017 15:13:00 -0800
From:   Sarangdhar Joshi <spjoshi@...eaurora.org>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Loic Pallardy <loic.pallardy@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>
Cc:     Sarangdhar Joshi <spjoshi@...eaurora.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, Dave Gerlach <d-gerlach@...com>,
        Suman Anna <s-anna@...com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Trilok Soni <tsoni@...eaurora.org>
Subject: [RFC][PATCH 1/2] remoteproc: Reduce asynchronous request_firmware to auto-boot only

The rproc_add_virtio_devices() requests firmware asynchronously and
triggers boot if the auto_boot flag is set. However, this
asynchronous call seems to be redundant for non auto-boot scenario
since the rproc_boot() would call request_firmware() anyways. Move
the auto_boot check to rproc_add() so that a redundant call to
_request_firmware can be avoided for non auto-boot case.

Signed-off-by: Sarangdhar Joshi <spjoshi@...eaurora.org>
---

I'm requesting RFC on this patch since I'm not aware of any scenario
where we might need asynchronous firmware loading for non auto-boot case.

 drivers/remoteproc/remoteproc_core.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index f58e634..16242b0 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -970,9 +970,7 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
 {
 	struct rproc *rproc = context;
 
-	/* if rproc is marked always-on, request it to boot */
-	if (rproc->auto_boot)
-		rproc_boot(rproc);
+	rproc_boot(rproc);
 
 	release_firmware(fw);
 }
@@ -1286,9 +1284,13 @@ int rproc_add(struct rproc *rproc)
 
 	/* create debugfs entries */
 	rproc_create_debug_dir(rproc);
-	ret = rproc_add_virtio_devices(rproc);
-	if (ret < 0)
-		return ret;
+
+	/* if rproc is marked always-on, request it to boot */
+	if (rproc->auto_boot) {
+		ret = rproc_add_virtio_devices(rproc);
+		if (ret < 0)
+			return ret;
+	}
 
 	/* expose to rproc_get_by_phandle users */
 	mutex_lock(&rproc_list_mutex);
-- 
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