Messages in this thread Patch in this message | | | From | Sudeep Holla <> | Subject | [PATCH RFT 06/12] firmware: arm_ffa: Implement the FFA_NOTIFICATION_GET interface | Date | Thu, 3 Aug 2023 20:02:10 +0100 |
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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.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> --- drivers/firmware/arm_ffa/driver.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+)
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index 492f5bfa3751..6cad91ee57eb 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -581,6 +581,14 @@ 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) @@ -624,6 +632,35 @@ 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; -- 2.41.0
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