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    Subject[PATCH v11 06/26] virt: gunyah: msgq: Add hypercalls to send and receive messages
    Date
    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 | 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
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