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firmware: arm_ffa: Implement the FFA_NOTIFICATION_GET interface

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The framework provides an interface to the receiver to determine the
identity of the notification. A receiver endpoint must use the
FFA_NOTIFICATION_GET interface to retrieve its pending notifications
and handle them.

Add the support for FFA_NOTIFICATION_GET to allow the caller(receiver)
to fetch its pending notifications from other partitions in the system.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-6-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2023-10-05 15:44:59 +01:00
parent 47561777d6
commit faa19623e3
1 changed files with 37 additions and 0 deletions
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37
drivers/firmware/arm_ffa/driver.c
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@ -593,6 +593,14 @@ static int ffa_notification_bitmap_destroy(void)
((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
#define NOTIFICATION_BITMAP_LOW(x) \
((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
#define PACK_NOTIFICATION_BITMAP(low, high) \
(FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))
#define RECEIVER_VCPU_MASK GENMASK(31, 16)
#define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
(FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
FIELD_PREP(RECEIVER_ID_MASK, (r)))
static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
u32 flags, bool is_bind)
@ -636,6 +644,35 @@ int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
return 0;
}
struct ffa_notify_bitmaps {
u64 sp_map;
u64 vm_map;
u64 arch_map;
};
static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
{
ffa_value_t ret;
u16 src_id = drv_info->vm_id;
u16 cpu_id = smp_processor_id();
u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
}, &ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
else if (ret.a0 != FFA_SUCCESS)
return -EINVAL; /* Something else went wrong. */
notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
notify->arch_map = PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7);
return 0;
}
static int ffa_run(struct ffa_device *dev, u16 vcpu)
{
ffa_value_t ret;