linux-kernel - [PATCH v11 06/26] virt: gunyah: msgq: Add hypercalls to send and receive messages

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Date:   Fri, 3 Mar 2023 17:06:12 -0800
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
CC:     Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Andy Gross <agross@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v11 06/26] virt: gunyah: msgq: Add hypercalls to send and receive messages

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

Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 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 0d14e767e2c8..3420d8f286a9 100644
--- a/arch/arm64/gunyah/gunyah_hypercall.c
+++ b/arch/arm64/gunyah/gunyah_hypercall.c
@@ -41,6 +41,8 @@ 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
@@ -60,5 +62,34 @@ 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, int 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 bd080e3a6fc9..18cfbf5ee48b 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -108,4 +108,10 @@ 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)
+
+enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, void *buff, int 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
-- 
2.39.2