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Message-Id: <20231005-ffa_v1-1_notif-v4-3-cddd3237809c@arm.com>
Date: Thu, 05 Oct 2023 15:44:56 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Sudeep Holla <sudeep.holla@....com>,
Marc Bonnici <marc.bonnici@....com>,
Jens Wiklander <jens.wiklander@...aro.org>,
Coboy Chen <coboy.chen@...iatek.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Olivier Deprez <olivier.deprez@....com>
Subject: [PATCH v4 03/17] firmware: arm_ffa: Implement the notification
bind and unbind interface
A receiver endpoint must bind a notification to any sender endpoint
before the latter can signal the notification to the former. The receiver
assigns one or more doorbells to a specific sender. Only the sender can
ring these doorbells.
A receiver uses the FFA_NOTIFICATION_BIND interface to bind one or more
notifications to the sender. A receiver un-binds a notification from a
sender endpoint to stop the notification from being signaled. It uses
the FFA_NOTIFICATION_UNBIND interface to do this.
Allow the FF-A driver to be able to bind and unbind a given notification
ID to a specific partition ID. This will be used to register and
unregister notification callbacks from the FF-A client drivers.
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/firmware/arm_ffa/driver.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index c2ab6f4cf296..20f8f4ca8e89 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -587,6 +587,35 @@ static int ffa_notification_bitmap_destroy(void)
return 0;
}
+#define NOTIFICATION_LOW_MASK GENMASK(31, 0)
+#define NOTIFICATION_HIGH_MASK GENMASK(63, 32)
+#define NOTIFICATION_BITMAP_HIGH(x) \
+ ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
+#define NOTIFICATION_BITMAP_LOW(x) \
+ ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
+
+static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
+ u32 flags, bool is_bind)
+{
+ ffa_value_t ret;
+ u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);
+
+ func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = func, .a1 = src_dst_ids, .a2 = flags,
+ .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
+ .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+ else if (ret.a0 != FFA_SUCCESS)
+ return -EINVAL;
+
+ return 0;
+}
+
static void ffa_set_up_mem_ops_native_flag(void)
{
if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
--
2.42.0
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