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firmware: arm_ffa: Implement the notification bind and unbind interface

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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.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-3-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2023-10-05 15:44:56 +01:00
parent 192e88cfea
commit 933db703e8
1 changed files with 29 additions and 0 deletions
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29
drivers/firmware/arm_ffa/driver.c
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@ -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) ||