diff options
| author | Sudeep Holla <sudeep.holla@arm.com> | 2023-10-05 15:44:56 +0100 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2023-10-06 15:33:13 +0100 |
| commit | 933db703e8ce3e30bb9f282afe73f7316338036b (patch) | |
| tree | cd9244b9f01d6d7d44e6f39a452718084a13b63d /drivers/firmware | |
| parent | 192e88cfea8ce2d85ab70fa1c8d768042e00b7f1 (diff) | |
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.
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>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/arm_ffa/driver.c | 29 |
1 files changed, 29 insertions, 0 deletions
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) || |