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firmware: arm_ffa: Implement the NOTIFICATION_INFO_GET interface

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The receiver’s scheduler uses the FFA_NOTIFICATION_INFO_GET interface
to retrieve the list of endpoints that have pending notifications and
must be run. A notification could be signaled by a sender in the secure
world to a VM. The Hypervisor needs to determine which VM and vCPU
(in case a per-vCPU notification is signaled) has a pending notification
in this scenario. It must obtain this information through an invocation
of the FFA_NOTIFICATION_INFO_GET.

Add the implementation of the NOTIFICATION_INFO_GET interface
and prepare to use this to handle the schedule receiver interrupt.
Implementation of handling notifications will be added later.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-7-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2023-10-05 15:45:00 +01:00
parent faa19623e3
commit 3522be48d8
1 changed files with 73 additions and 0 deletions
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73
drivers/firmware/arm_ffa/driver.c
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@ -602,6 +602,13 @@ static int ffa_notification_bitmap_destroy(void)
(FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
FIELD_PREP(RECEIVER_ID_MASK, (r)))
#define NOTIFICATION_INFO_GET_MORE_PEND_MASK BIT(0)
#define NOTIFICATION_INFO_GET_ID_COUNT GENMASK(11, 7)
#define ID_LIST_MASK_64 GENMASK(51, 12)
#define ID_LIST_MASK_32 GENMASK(31, 12)
#define MAX_IDS_64 20
#define MAX_IDS_32 10
static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
u32 flags, bool is_bind)
{
@ -673,6 +680,72 @@ static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
return 0;
}
static void __do_sched_recv_cb(u16 partition_id, u16 vcpu, bool is_per_vcpu)
{
pr_err("Callback for partition 0x%x failed.\n", partition_id);
}
static void ffa_notification_info_get(void)
{
int idx, list, max_ids, lists_cnt, ids_processed, ids_count[MAX_IDS_64];
bool is_64b_resp;
ffa_value_t ret;
u64 id_list;
do {
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET),
}, &ret);
if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) {
if (ret.a2 != FFA_RET_NO_DATA)
pr_err("Notification Info fetch failed: 0x%lx (0x%lx)",
ret.a0, ret.a2);
return;
}
is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS);
ids_processed = 0;
lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2);
if (is_64b_resp) {
max_ids = MAX_IDS_64;
id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2);
} else {
max_ids = MAX_IDS_32;
id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2);
}
for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2)
ids_count[idx] = (id_list & 0x3) + 1;
/* Process IDs */
for (list = 0; list < lists_cnt; list++) {
u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3;
if (ids_processed >= max_ids - 1)
break;
part_id = packed_id_list[++ids_processed];
if (!ids_count[list]) { /* Global Notification */
__do_sched_recv_cb(part_id, 0, false);
continue;
}
/* Per vCPU Notification */
for (idx = 0; idx < ids_count[list]; idx++) {
if (ids_processed >= max_ids - 1)
break;
vcpu_id = packed_id_list[++ids_processed];
__do_sched_recv_cb(part_id, vcpu_id, true);
}
}
} while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK);
}
static int ffa_run(struct ffa_device *dev, u16 vcpu)
{
ffa_value_t ret;