From: Thomas Gleixner <tglx@linutronix.de>
To: Bjorn Helgaas <helgaas@kernel.org>, Sunil V L <sunilvl@ventanamicro.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org,
linux-serial@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
Anup Patel <anup@brainfault.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>,
Conor Dooley <conor.dooley@microchip.com>,
Andrew Jones <ajones@ventanamicro.com>,
Atish Kumar Patra <atishp@rivosinc.com>,
Haibo Xu <haibo1.xu@intel.com>, Marc Zyngier <maz@kernel.org>
Subject: Re: [RFC PATCH v2 13/21] irqchip: riscv-intc: Add ACPI support for AIA
Date: Fri, 27 Oct 2023 19:45:38 +0200 [thread overview]
Message-ID: <87jzr82c3h.ffs@tglx> (raw)
In-Reply-To: <20231026165150.GA1825130@bhelgaas>
On Thu, Oct 26 2023 at 11:51, Bjorn Helgaas wrote:
> On Thu, Oct 26, 2023 at 01:53:36AM +0530, Sunil V L wrote:
>> The RINTC subtype structure in MADT also has information about other
>> interrupt controllers like MMIO. So, save those information and provide
>> interfaces to retrieve them when required by corresponding drivers.
>
>> @@ -218,7 +306,19 @@ static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header,
>
>> + * MSI controller (IMSIC) in RISC-V is optional. So, unless
>> + * IMSIC is discovered, set system wide MSI support as
>> + * unsupported. Once IMSIC is probed, MSI support will be set.
>> + */
>> + pci_no_msi();
>
> It doesn't seem like we should have to tell the PCI core about
> functionality we *don't* have.
>
> I would think IMSIC would be detected before enumerating PCI devices
> that might use it, and if we *haven't* found an IMSIC by the time we
> get to pci_register_host_bridge(), would/should we set
> PCI_BUS_FLAGS_NO_MSI there?
>
> I see Thomas is cc'd; he'd have better insight.
I was not really involved with this bus and MSI domain logic. Marc
should know. CC'ed.
Thanks,
tglx
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-10-27 17:46 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-25 20:23 [RFC PATCH v2 00/21] RISC-V: ACPI: Add external interrupt controller support Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 01/21] arm64: PCI: Migrate ACPI related functions to pci-acpi.c Sunil V L
2023-10-26 16:31 ` Catalin Marinas
2023-10-25 20:23 ` [RFC PATCH v2 02/21] RISC-V: ACPI: Implement PCI related functionality Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 03/21] ACPI: Kconfig: Introduce new option to support deferred GSI probe Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 04/21] ACPI: irq: Add support for deferred probe in acpi_register_gsi() Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 05/21] pnp.h: Return -EPROBE_DEFER for disabled IRQ resource in pnp_irq() Sunil V L
2024-02-01 18:00 ` Rafael J. Wysocki
2024-02-02 8:48 ` Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 06/21] RISC-V: Kconfig: Select deferred GSI probe for ACPI systems Sunil V L
2023-10-26 17:04 ` Bjorn Helgaas
2023-10-25 20:23 ` [RFC PATCH v2 07/21] serial: 8250_pnp: Add support for deferred probe Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 08/21] ACPI: pci_irq: Avoid warning for deferred probe in acpi_pci_irq_enable() Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 09/21] ACPI: scan.c: Add weak arch specific function to reorder the IRQCHIP probe Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 10/21] ACPI: RISC-V: Implement arch function to reorder irqchip probe entries Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 11/21] PCI: MSI: Add helper function to set system wide MSI support Sunil V L
2023-10-30 14:28 ` Thomas Gleixner
2023-10-30 17:54 ` Sunil V L
2023-10-30 19:29 ` Thomas Gleixner
2023-10-31 2:00 ` Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 12/21] PCI: pci-acpi.c: Return correct value from pcibios_alloc_irq() Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 13/21] irqchip: riscv-intc: Add ACPI support for AIA Sunil V L
2023-10-26 16:51 ` Bjorn Helgaas
2023-10-27 11:29 ` Sunil V L
2023-10-27 11:54 ` Sunil V L
2023-10-27 17:45 ` Thomas Gleixner [this message]
2023-11-06 11:35 ` Marc Zyngier
2023-10-25 20:23 ` [RFC PATCH v2 14/21] irqchip: riscv-imsic: Add ACPI support Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 15/21] irqchip: riscv-aplic: " Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 16/21] irqchip: irq-sifive-plic: " Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 17/21] ACPI: bus: Add RINTC IRQ model for RISC-V Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 18/21] irqchip: riscv-intc: Set ACPI irqmodel Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 19/21] ACPI: bus: Add acpi_riscv_init function Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 20/21] ACPI: RISC-V: Create APLIC platform device Sunil V L
2023-10-25 20:23 ` [RFC PATCH v2 21/21] ACPI: RISC-V: Create PLIC " Sunil V L
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87jzr82c3h.ffs@tglx \
--to=tglx@linutronix.de \
--cc=ajones@ventanamicro.com \
--cc=anup@brainfault.org \
--cc=aou@eecs.berkeley.edu \
--cc=atishp@rivosinc.com \
--cc=bhelgaas@google.com \
--cc=catalin.marinas@arm.com \
--cc=conor.dooley@microchip.com \
--cc=gregkh@linuxfoundation.org \
--cc=haibo1.xu@intel.com \
--cc=helgaas@kernel.org \
--cc=jirislaby@kernel.org \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=linux-serial@vger.kernel.org \
--cc=maz@kernel.org \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=rafael@kernel.org \
--cc=sunilvl@ventanamicro.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).