linux-kernel - [PATCH AUTOSEL 6.12 324/486] firmware: arm_ffa: Handle the presence of host partition in the partition info

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Message-Id: <20250505223922.2682012-324-sashal@kernel.org>
Date: Mon,  5 May 2025 18:36:40 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.12 324/486] firmware: arm_ffa: Handle the presence of host partition in the partition info

From: Sudeep Holla <sudeep.holla@....com>

[ Upstream commit 2f622a8b0722d332a2a149794a3add47bc9bdcf3 ]

Currently it is assumed that the firmware doesn't present the host
partition in the list of partitions presented as part of the response
to PARTITION_INFO_GET from the firmware. However, there are few
platforms that prefer to present the same in the list of partitions.
It is not manadatory but not restricted as well.

So handle the same by making sure to check the presence of the host
VM ID in the XArray partition information maintained/managed in the
driver before attempting to add it.

Tested-by: Viresh Kumar <viresh.kumar@...aro.org>
Message-Id: <20250217-ffa_updates-v3-7-bd1d9de615e7@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/arm_ffa/driver.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index e8efa6cfd58cd..52e1cbaab856d 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -1448,6 +1448,10 @@ static int ffa_setup_partitions(void)
 
 	kfree(pbuf);
 
+	/* Check if the host is already added as part of partition info */
+	if (xa_load(&drv_info->partition_info, drv_info->vm_id))
+		return 0;
+
 	/* Allocate for the host */
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
-- 
2.39.5