[PATCH v5 08/13] virt: gunyah: msgq: Add hypercalls to send and receive messages

Elliot Berman
2022-10-11T00:09:47Z

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

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

diff --git a/arch/arm64/gunyah/hypercall.c b/arch/arm64/gunyah/hypercall.c
index 5b08c9d80de0..042cca31879e 100644
--- a/arch/arm64/gunyah/hypercall.c
+++ b/arch/arm64/gunyah/hypercall.c
@@ -26,6 +26,8 @@
| ((fn) & GH_CALL_FUNCTION_NUM_MASK))

#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.
@@ -67,5 +69,36 @@ 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/asm-generic/gunyah.h b/include/asm-generic/gunyah.h
index 8f9d4c649ba8..34c41c8393d0 100644
--- a/include/asm-generic/gunyah.h
+++ b/include/asm-generic/gunyah.h
@@ -110,4 +110,9 @@ extern struct gh_hypercall_hyp_identify_resp gunyah_api;
void gh_hypercall_get_uid(u32 *uid);
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
--
2.25.1