From: Marc Zyngier <maz@kernel.org>
To: Frank Li <Frank.Li@nxp.com>
Cc: tglx@linutronix.de, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, shawnguo@kernel.org,
s.hauer@pengutronix.de, kw@linux.com, bhelgaas@google.com,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
peng.fan@nxp.com, aisheng.dong@nxp.com, jdmason@kudzu.us,
kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
kishon@ti.com, lorenzo.pieralisi@arm.com, ntb@lists.linux.dev,
lznuaa@gmail.com, imx@lists.linux.dev,
manivannan.sadhasivam@linaro.org
Subject: Re: [PATCH v11 0/6] PCI EP driver support MSI doorbell from host
Date: Wed, 28 Sep 2022 09:33:47 -0400 [thread overview]
Message-ID: <86mtaj7hdw.wl-maz@kernel.org> (raw)
In-Reply-To: <20220922161246.20586-1-Frank.Li@nxp.com>
On Thu, 22 Sep 2022 12:12:40 -0400,
Frank Li <Frank.Li@nxp.com> wrote:
>
>
>
> ┌───────┐ ┌──────────┐
> │ │ │ │
> ┌─────────────┐ │ │ │ PCI Host │
> │ MSI │◄┐ │ │ │ │
> │ Controller │ │ │ │ │ │
> └─────────────┘ └─┼───────┼──────────┼─Bar0 │
> │ PCI │ │ Bar1 │
> │ Func │ │ Bar2 │
> │ │ │ Bar3 │
> │ │ │ Bar4 │
> │ ├─────────►│ │
> └───────┘ └──────────┘
>
> Many PCI controllers provided Endpoint functions.
> Generally PCI endpoint is hardware, which is not running a rich OS,
> like linux.
>
> But Linux also supports endpoint functions. PCI Host write BAR<n> space
> like write to memory. The EP side can't know memory changed by the Host
> driver.
>
> PCI Spec has not defined a standard method to do that. Only define
> MSI(x) to let EP notified RC status change.
[...]
FWIW, I have queued the first 4 patches of this series into -next. If
there is a need for these patches to be pulled by another subsystem, I
have pushed out a stable branch at [1].
Thanks,
M.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=irq/fsl-mu-msi
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2022-09-28 13:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 16:12 [PATCH v11 0/6] PCI EP driver support MSI doorbell from host Frank Li
2022-09-22 16:12 ` [PATCH v12 1/6] platform-msi: export symbol platform_msi_create_irq_domain() Frank Li
2022-09-22 16:12 ` [PATCH v12 2/6] irqchip: allow pass down .pm field at IRQCHIP_PLATFORM_DRIVER_END Frank Li
2022-09-22 16:12 ` [PATCH v12 3/6] irqchip: Add IMX MU MSI controller driver Frank Li
2022-09-22 16:12 ` [PATCH v12 4/6] dt-bindings: irqchip: imx mu work as msi controller Frank Li
2022-09-22 16:12 ` [PATCH v12 5/6] PCI: endpoint: pci-epf-vntb: Clean up Frank Li
2022-10-06 14:25 ` Frank Li
2022-10-07 8:43 ` Lorenzo Pieralisi
2022-09-22 16:12 ` [PATCH v12 6/6] PCI: endpoint: Add vNTB MSI support Frank Li
2022-10-07 9:15 ` Lorenzo Pieralisi
2022-10-07 14:54 ` [EXT] " Frank Li
2022-09-28 13:33 ` Marc Zyngier [this message]
-- strict thread matches above, loose matches on Subject: below --
2022-09-19 15:40 [PATCH v11 0/6] PCI EP driver support MSI doorbell from host Frank Li
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