[PATCH v9 07/27] virt: gunyah: msgq: Add hypercalls to send and receive messages

Elliot Berman
2023-01-20T22:48:17Z

Add hypercalls to send and receive messages on a Gunyah message queue.

Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
arch/arm64/gunyah/gunyah_hypercall.c | 33 ++++++++++++++++++++++++++++
include/linux/gunyah.h | 5 +++++
2 files changed, 38 insertions(+)

diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c
index ffed4b71641f..d93ad2c08479 100644
--- a/arch/arm64/gunyah/gunyah_hypercall.c
+++ b/arch/arm64/gunyah/gunyah_hypercall.c
@@ -13,6 +13,8 @@ static const uint32_t gunyah_known_uuids[][4] = {
};

#define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x0000)
+#define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x001B)
+#define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x001C)

/**
* gh_hypercall_get_uid() - Returns a UID when running under a Gunyah hypervisor
@@ -71,5 +73,36 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi
}
EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify);

+int gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, bool *ready)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, buff, tx_flags, 0, &res);
+
+ if (res.a0)
+ return res.a0;
+
+ *ready = res.a1;
+
+ return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send);
+
+int gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, bool *ready)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, buff, size, 0, &res);
+
+ if (res.a0)
+ return res.a0;
+
+ *recv_size = res.a1;
+ *ready = res.a2;
+
+ return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv);
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls");
diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
index 6724d1264d58..b5f61c14ec1e 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -104,4 +104,9 @@ struct gh_hypercall_hyp_identify_resp {

void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity);

+#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH BIT(0)
+
+int gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, bool *ready);
+int gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, bool *ready);
+
#endif
--
2.39.0