[PATCH v14 22/25] virt: gunyah: Add hypercalls for sending doorbell

[Elliot Berman]

Gunyah doorbells allow two virtual machines to signal each other using
interrupts. Add the hypercalls needed to assert the interrupt.

Reviewed-by: Alex Elder <elder@xxxxxxxxxx>
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
 arch/arm64/gunyah/gunyah_hypercall.c | 25 +++++++++++++++++++++++++
 include/linux/gunyah.h               |  3 +++
 2 files changed, 28 insertions(+)

diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c
index 7d96491f84e00..e178b5a0f6917 100644
--- a/arch/arm64/gunyah/gunyah_hypercall.c
+++ b/arch/arm64/gunyah/gunyah_hypercall.c
@@ -35,6 +35,8 @@ EXPORT_SYMBOL_GPL(arch_is_gh_guest);
 						   fn)
 
 #define GH_HYPERCALL_HYP_IDENTIFY		GH_HYPERCALL(0x8000)
+#define GH_HYPERCALL_BELL_SEND			GH_HYPERCALL(0x8012)
+#define GH_HYPERCALL_BELL_SET_MASK		GH_HYPERCALL(0x8015)
 #define GH_HYPERCALL_MSGQ_SEND			GH_HYPERCALL(0x801B)
 #define GH_HYPERCALL_MSGQ_RECV			GH_HYPERCALL(0x801C)
 #define GH_HYPERCALL_VCPU_RUN			GH_HYPERCALL(0x8065)
@@ -57,6 +59,29 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi
 }
 EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify);
 
+enum gh_error gh_hypercall_bell_send(u64 capid, u64 new_flags, u64 *old_flags)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GH_HYPERCALL_BELL_SEND, capid, new_flags, 0, &res);
+
+	if (res.a0 == GH_ERROR_OK && old_flags)
+		*old_flags = res.a1;
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_bell_send);
+
+enum gh_error gh_hypercall_bell_set_mask(u64 capid, u64 enable_mask, u64 ack_mask)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GH_HYPERCALL_BELL_SET_MASK, capid, enable_mask, ack_mask, 0, &res);
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_bell_set_mask);
+
 enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready)
 {
 	struct arm_smccc_res res;
diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
index cd5704a82c6a5..1f1685518bf3c 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -171,6 +171,9 @@ static inline u16 gh_api_version(const struct gh_hypercall_hyp_identify_resp *gh
 
 void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity);
 
+enum gh_error gh_hypercall_bell_send(u64 capid, u64 new_flags, u64 *old_flags);
+enum gh_error gh_hypercall_bell_set_mask(u64 capid, u64 enable_mask, u64 ack_mask);
+
 #define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH		BIT(0)
 
 enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready);
-- 
2.40.0