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Subject[PATCH RFT 03/12] firmware: arm_ffa: Implement the notification bind and unbind interface
Date
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@arm.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 022c893c9e06..a76e5d3a2422 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -575,6 +575,35 @@ 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) ||
--
2.41.0

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