[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v2 3/4] xen/riscv: implement basic aplic_preinit()
On 26.03.2025 17:49, Oleksii Kurochko wrote: > On 3/26/25 4:19 PM, Jan Beulich wrote: >> On 25.03.2025 18:36, Oleksii Kurochko wrote: >>> Introduce preinitialization stuff for the RISC-V Advanced Platform-Level >>> Interrupt Controller (APLIC) in Xen: >>> - Implementing the APLIC pre-initialization function (`aplic_preinit()`), >>> ensuring that only one APLIC instance is supported in S mode. >>> - Initialize APLIC's correspoinding DT node. >>> - Declaring the DT device match table for APLIC. >>> - Setting `aplic_info.hw_version` during its declaration. >>> - Declaring an APLIC device. >>> >>> Since Microchip originally developed aplic.c [1], an internal discussion >>> with them led to the decision to use the MIT license instead of the default >>> GPL-2.0-only. >>> >>> [1]https://gitlab.com/xen-project/people/olkur/xen/-/commit/7cfb4bd4748ca268142497ac5c327d2766fb342d >>> >>> Signed-off-by: Romain Caritey<Romain.Caritey@xxxxxxxxxxxxx> >>> Signed-off-by: Oleksii Kurochko<oleksii.kurochko@xxxxxxxxx> >> You recall that From: != 1st S-o-b is unusual, and wants some explanation. >> IOW it's unclear who the original author of this patch is. > > I'm not 100% sure who should be the author. Such patch doesn't exist before > but I took the changes > based on the changes mentioned in commit message as [1]. > > If you think that the author should be Romain, I am okay with that. I can't sensibly form an opinion here. This needs settling between him and you. >From your reply I'm not even convinced his S-o-b is legitimately there then. You may want to use another, less standard tag in such a case (like the Co-developed-by: that I've seen in use here and there) to still give credit to him. >>> --- /dev/null >>> +++ b/xen/arch/riscv/aplic.c >>> @@ -0,0 +1,49 @@ >>> +/* SPDX-License-Identifier: MIT */ >>> + >>> +/* >>> + * xen/arch/riscv/aplic.c >>> + * >>> + * RISC-V Advanced Platform-Level Interrupt Controller support >>> + * >>> + * Copyright (c) 2023-2024 Microchip. >>> + * Copyright (c) 2024-2025 Vates >>> + */ >>> + >>> +#include <xen/errno.h> >>> +#include <xen/init.h> >>> +#include <xen/types.h> >>> + >>> +#include <asm/device.h> >>> +#include <asm/intc.h> >>> + >>> +static struct intc_info aplic_info = { >>> + .hw_version = INTC_APLIC >>> +}; >> Is this going to be written to (much) post-init? IOW - __read_mostly or >> even __ro_after_init? > > I think that __read_mostly would be better because intc_info structure in the > future > will contain member "void *private". And in `private` it can be a data which > can > be changed. You mean the pointer can change? Or merely what it points to, i.e. ... > For example, `private` can contain an aplic_priv structure: > struct aplic_priv { > /* number of irqs */ > uint32_t nr_irqs; > > /* base physical address and size */ > paddr_t paddr_start; > paddr_t paddr_end; > uint64_t size; > > /* registers */ > struct aplic_regs *regs; > > /* imsic configuration */ > const struct imsic_config *imsic_cfg; > }; > > and regs from aplic_priv structure can be changed in runtime. ... the contents of such a struct? In this latter case the struct instance here can still be __ro_after_init as long as the pointer is set from an __init function. Jan
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