From: Bjorn Helgaas <helgaas@kernel.org>
To: "Pali Rohár" <pali@kernel.org>
Cc: "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Marek Behún" <kabel@kernel.org>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 05/15] PCI: mvebu: Disallow mapping interrupts on emulated bridges
Date: Fri, 7 Jan 2022 15:32:16 -0600 [thread overview]
Message-ID: <20220107213216.GA403555@bhelgaas> (raw)
In-Reply-To: <20211125124605.25915-6-pali@kernel.org>
On Thu, Nov 25, 2021 at 01:45:55PM +0100, Pali Rohár wrote:
> Interrupt support on mvebu emulated bridges is not implemented yet.
Is this mvebu-specific, or is aardvar also affected?
> So properly indicate return value to callers that they cannot request
> interrupts from emulated bridge.
Pet peeve: descriptions that say "do this *properly*". As though the
previous authors were just ignorant or intentionally did something
*improperly* :)
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Cc: stable@vger.kernel.org
> ---
> drivers/pci/controller/pci-mvebu.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index 19c6ee298442..a3df352d440e 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -705,6 +705,15 @@ static struct pci_ops mvebu_pcie_ops = {
> .write = mvebu_pcie_wr_conf,
> };
>
> +static int mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
> +{
> + /* Interrupt support on mvebu emulated bridges is not implemented yet */
> + if (dev->bus->number == 0)
> + return 0; /* Proper return code 0 == NO_IRQ */
> +
> + return of_irq_parse_and_map_pci(dev, slot, pin);
Is this something that could be done with a .read_base() op, e.g.,
make PCI_INTERRUPT_PIN contain zero (PCI_INTERRUPT_UNKNOWN)?
> +}
> +
> static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
> const struct resource *res,
> resource_size_t start,
> @@ -1119,6 +1128,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
> bridge->sysdata = pcie;
> bridge->ops = &mvebu_pcie_ops;
> bridge->align_resource = mvebu_pcie_align_resource;
> + bridge->map_irq = mvebu_pcie_map_irq;
I assume this means INTx doesn't work for some devices? Which ones?
I guess anything on the root bus? But INTx for devices *below* these
emulated Root Ports *does* work?
> return pci_host_probe(bridge);
> }
> --
> 2.20.1
>
next prev parent reply other threads:[~2022-01-07 21:32 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 12:45 [PATCH 00/15] pci: mvebu: Various fixes Pali Rohár
2021-11-25 12:45 ` [PATCH 01/15] PCI: mvebu: Check for valid ports Pali Rohár
2021-11-25 12:45 ` [PATCH 02/15] PCI: mvebu: Check for errors from pci_bridge_emul_init() call Pali Rohár
2021-11-25 12:45 ` [PATCH 03/15] PCI: mvebu: Check that PCI bridge specified in DT has function number zero Pali Rohár
2022-01-07 18:15 ` Bjorn Helgaas
2022-01-07 18:18 ` Pali Rohár
2022-01-07 21:09 ` Bjorn Helgaas
2022-01-07 21:58 ` Pali Rohár
2021-11-25 12:45 ` [PATCH 04/15] PCI: mvebu: Handle invalid size of read config request Pali Rohár
2022-01-07 18:45 ` Bjorn Helgaas
2022-01-07 19:15 ` Russell King (Oracle)
2021-11-25 12:45 ` [PATCH 05/15] PCI: mvebu: Disallow mapping interrupts on emulated bridges Pali Rohár
2022-01-07 21:32 ` Bjorn Helgaas [this message]
2022-01-07 22:13 ` Pali Rohár
2022-01-07 23:01 ` Bjorn Helgaas
2022-01-07 23:11 ` Pali Rohár
2021-11-25 12:45 ` [PATCH 06/15] PCI: mvebu: Fix support for bus mastering and PCI_COMMAND on emulated bridge Pali Rohár
2021-11-25 12:45 ` [PATCH 07/15] PCI: mvebu: Do not modify PCI IO type bits in conf_write Pali Rohár
2021-11-25 12:45 ` [PATCH 08/15] PCI: mvebu: Propagate errors when updating PCI_IO_BASE and PCI_MEM_BASE registers Pali Rohár
2022-01-07 21:55 ` Bjorn Helgaas
2022-01-07 22:28 ` Pali Rohár
2022-01-07 23:16 ` Bjorn Helgaas
2022-01-07 23:46 ` Pali Rohár
2022-01-13 0:19 ` Bjorn Helgaas
2022-01-13 10:35 ` Pali Rohár
2022-01-20 17:50 ` Bjorn Helgaas
2022-01-20 19:08 ` Pali Rohár
2022-01-20 19:37 ` Bjorn Helgaas
2021-11-25 12:45 ` [PATCH 09/15] PCI: mvebu: Setup PCIe controller to Root Complex mode Pali Rohár
2021-11-25 12:46 ` [PATCH 10/15] PCI: mvebu: Set PCI Bridge Class Code to PCI Bridge Pali Rohár
2021-11-25 12:46 ` [PATCH 11/15] PCI: mvebu: Fix configuring secondary bus of PCIe Root Port via emulated bridge Pali Rohár
2021-11-25 12:46 ` [PATCH 12/15] PCI: mvebu: Fix support for PCI_BRIDGE_CTL_BUS_RESET on " Pali Rohár
2021-11-25 12:46 ` [PATCH 13/15] PCI: mvebu: Fix support for PCI_EXP_DEVCTL " Pali Rohár
2021-11-25 12:46 ` [PATCH 14/15] PCI: mvebu: Fix support for PCI_EXP_RTSTA " Pali Rohár
2021-11-25 12:46 ` [PATCH 15/15] PCI: mvebu: Fix support for DEVCAP2, DEVCTL2 and LNKCTL2 registers " Pali Rohár
2022-01-04 15:04 ` [PATCH 00/15] pci: mvebu: Various fixes Lorenzo Pieralisi
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