On 5/9/23 3:47 PM, Elliot Berman wrote:
Add hypercalls to send and receive messages on a Gunyah message queue.
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
I continue to dislike the long lines, but aside from that this
looks fine.
Reviewed-by: Alex Elder <elder@xxxxxxxxxx>
---
arch/arm64/gunyah/gunyah_hypercall.c | 31 ++++++++++++++++++++++++++++
include/linux/gunyah.h | 6 ++++++
2 files changed, 37 insertions(+)
diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c
index 2166d5dab869..2b2a63e9b9e5 100644
--- a/arch/arm64/gunyah/gunyah_hypercall.c
+++ b/arch/arm64/gunyah/gunyah_hypercall.c
@@ -33,6 +33,8 @@ EXPORT_SYMBOL_GPL(arch_is_gh_guest);
fn)
#define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000)
+#define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x801B)
+#define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x801C)
/**
* gh_hypercall_hyp_identify() - Returns build information and feature flags
@@ -52,5 +54,34 @@ 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_msgq_send(u64 capid, size_t size, void *buff, u64 tx_flags, bool *ready)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, (uintptr_t)buff, tx_flags, 0, &res);
+
+ if (res.a0 == GH_ERROR_OK)
+ *ready = !!res.a1;
+
+ return res.a0;
+}
+EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send);
+
+enum gh_error gh_hypercall_msgq_recv(u64 capid, void *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, (uintptr_t)buff, size, 0, &res);
+
+ if (res.a0 == GH_ERROR_OK) {
+ *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 6b36cf4787ef..01a6f202d037 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -111,4 +111,10 @@ 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);
+#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);
+enum gh_error gh_hypercall_msgq_recv(u64 capid, void *buff, size_t size, size_t *recv_size,
+ bool *ready);
+
#endif
