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Re: [PATCH v2 06/16] xen/riscv: introduce init_IRQ()
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 14 May 2025 16:49:46 +0200
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 14 May 2025 14:50:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.05.2025 18:51, Oleksii Kurochko wrote:
> --- a/xen/arch/riscv/include/asm/irq.h
> +++ b/xen/arch/riscv/include/asm/irq.h
> @@ -3,6 +3,11 @@
> #define ASM__RISCV__IRQ_H
>
> #include <xen/bug.h>
> +#include <xen/device_tree.h>
> +
> +#include <asm/irq-dt.h>
> +
> +#define NR_IRQS 1024
Is this arbitrary or arch-induced? Imo it wants saying in a brief comment either
way. Then again maybe it's entirely obvious for a RISC-V person ...
> --- /dev/null
> +++ b/xen/arch/riscv/irq.c
> @@ -0,0 +1,45 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +
> +/*
> + * RISC-V Trap handlers
> + *
> + * Copyright (c) 2024 Vates
> + */
> +
> +#include <xen/bug.h>
> +#include <xen/init.h>
> +#include <xen/irq.h>
> +
> +static irq_desc_t irq_desc[NR_IRQS];
> +
> +int arch_init_one_irq_desc(struct irq_desc *desc)
> +{
> + desc->arch.type = IRQ_TYPE_INVALID;
> +
> + return 0;
> +}
> +
> +static int __init init_irq_data(void)
> +{
> + unsigned int irq;
> +
> + for ( irq = 0; irq < NR_IRQS; irq++ )
> + {
> + struct irq_desc *desc = irq_to_desc(irq);
> + int rc = init_one_irq_desc(desc);
> +
> + if ( rc )
> + return rc;
> +
> + desc->irq = irq;
> + desc->action = NULL;
Nit: You copied a stray blank from Arm code. Actually I wonder why it isn't
init_one_irq_desc() that clears this field. It also feels like ->irq would
better be set ahead of calling that function, like x86 has it.
Jan
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