On Thu, Feb 22, 2024 at 03:16:34PM -0800, Elliot Berman wrote:
> When booting a Gunyah virtual machine, the host VM may gain capabilities
> to interact with resources for the guest virtual machine. Examples of
> such resources are vCPUs or message queues. To use those resources, we
> need to translate the RM response into a gunyah_resource structure which
> are useful to Linux drivers. Presently, Linux drivers need only to know
> the type of resource, the capability ID, and an interrupt.
>
> On ARM64 systems, the interrupt reported by Gunyah is the GIC interrupt
> ID number and always a SPI or extended SPI.
>
> Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
> ---
> arch/arm64/include/asm/gunyah.h | 36 ++++++++++++++++++++++
> drivers/virt/gunyah/rsc_mgr.c | 67 +++++++++++++++++++++++++++++++++++++++++
> drivers/virt/gunyah/rsc_mgr.h | 5 +++
> include/linux/gunyah.h | 2 ++
> 4 files changed, 110 insertions(+)
>
> diff --git a/arch/arm64/include/asm/gunyah.h b/arch/arm64/include/asm/gunyah.h
> new file mode 100644
> index 0000000000000..0cd3debe22b64
> --- /dev/null
> +++ b/arch/arm64/include/asm/gunyah.h
> @@ -0,0 +1,36 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +#ifndef _ASM_GUNYAH_H
> +#define _ASM_GUNYAH_H
> +
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +
> +static inline int arch_gunyah_fill_irq_fwspec_params(u32 virq,
> + struct irq_fwspec *fwspec)
> +{
> + /* Assume that Gunyah gave us an SPI or ESPI; defensively check it */
> + if (WARN(virq < 32, "Unexpected virq: %d\n", virq)) {
> + return -EINVAL;
> + } else if (virq <= 1019) {
> + fwspec->param_count = 3;
> + fwspec->param[0] = 0; /* GIC_SPI */
> + fwspec->param[1] = virq - 32; /* virq 32 -> SPI 0 */
> + fwspec->param[2] = IRQ_TYPE_EDGE_RISING;
> + } else if (WARN(virq < 4096, "Unexpected virq: %d\n", virq)) {
> + return -EINVAL;
> + } else if (virq < 5120) {
> + fwspec->param_count = 3;
> + fwspec->param[0] = 2; /* GIC_ESPI */
> + fwspec->param[1] = virq - 4096; /* virq 4096 -> ESPI 0 */
> + fwspec->param[2] = IRQ_TYPE_EDGE_RISING;
> + } else {
> + WARN(1, "Unexpected virq: %d\n", virq);
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
__get_intid_range() in gic-v3 driver looks more pleasing. Other than
that the logic for the translation looks good to me.
Thanks,
Pavan
