linux-kernel - [PATCH v2 07/18] firmware: arm_ffa: Handle the presence of host partition in the partition info

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Message-Id: <20250131-ffa_updates-v2-7-544ba4e35387@arm.com>
Date: Fri, 31 Jan 2025 11:24:07 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Sudeep Holla <sudeep.holla@....com>, Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH v2 07/18] firmware: arm_ffa: Handle the presence of host
 partition in the partition info

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.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 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 67d5be261d83633805c81dd84fdfc2b5c702f3ca..54777055d54f5bf2dba1128e6a91bd1c0ece04fc 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -1489,6 +1489,10 @@ 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 */
 	ret = ffa_xa_add_partition_info(drv_info->vm_id);
 	if (ret) {

-- 
2.34.1