From: "Pali Rohár" <pali@kernel.org> To: Bjorn Helgaas <helgaas@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 03/15] PCI: mvebu: Check that PCI bridge specified in DT has function number zero Date: Fri, 7 Jan 2022 19:18:19 +0100 [thread overview] Message-ID: <20220107181819.yiya3mxhtfsnubg4@pali> (raw) In-Reply-To: <20220107181512.GA390598@bhelgaas> On Friday 07 January 2022 12:15:12 Bjorn Helgaas wrote: > On Thu, Nov 25, 2021 at 01:45:53PM +0100, Pali Rohár wrote: > > Driver cannot handle PCI bridges at non-zero function address. So add > > appropriate check. Currently all in-tree kernel DTS files set PCI bridge > > function to zero. > > Why can the driver not handle bridges at non-zero function addresses? > The PCI spec allows that, doesn't it? Is this a hardware limitation? It is software / kernel limitation. Because this bridge is virtual, emulated by pci-bridge-emul.c driver and this driver can emulate only single function PCI-to-PCI bridge device. > > Signed-off-by: Pali Rohár <pali@kernel.org> > > Cc: stable@vger.kernel.org > > --- > > drivers/pci/controller/pci-mvebu.c | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c > > index 6197f7e7c317..08274132cdfb 100644 > > --- a/drivers/pci/controller/pci-mvebu.c > > +++ b/drivers/pci/controller/pci-mvebu.c > > @@ -864,6 +864,11 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, > > port->devfn = of_pci_get_devfn(child); > > if (port->devfn < 0) > > goto skip; > > + if (PCI_FUNC(port->devfn) != 0) { > > + dev_err(dev, "%s: invalid function number, must be zero\n", > > + port->name); > > + goto skip; > > + } > > > > ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM, > > &port->mem_target, &port->mem_attr); > > -- > > 2.20.1 > >
WARNING: multiple messages have this Message-ID (diff)
From: "Pali Rohár" <pali@kernel.org> To: Bjorn Helgaas <helgaas@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 03/15] PCI: mvebu: Check that PCI bridge specified in DT has function number zero Date: Fri, 7 Jan 2022 19:18:19 +0100 [thread overview] Message-ID: <20220107181819.yiya3mxhtfsnubg4@pali> (raw) In-Reply-To: <20220107181512.GA390598@bhelgaas> On Friday 07 January 2022 12:15:12 Bjorn Helgaas wrote: > On Thu, Nov 25, 2021 at 01:45:53PM +0100, Pali Rohár wrote: > > Driver cannot handle PCI bridges at non-zero function address. So add > > appropriate check. Currently all in-tree kernel DTS files set PCI bridge > > function to zero. > > Why can the driver not handle bridges at non-zero function addresses? > The PCI spec allows that, doesn't it? Is this a hardware limitation? It is software / kernel limitation. Because this bridge is virtual, emulated by pci-bridge-emul.c driver and this driver can emulate only single function PCI-to-PCI bridge device. > > Signed-off-by: Pali Rohár <pali@kernel.org> > > Cc: stable@vger.kernel.org > > --- > > drivers/pci/controller/pci-mvebu.c | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c > > index 6197f7e7c317..08274132cdfb 100644 > > --- a/drivers/pci/controller/pci-mvebu.c > > +++ b/drivers/pci/controller/pci-mvebu.c > > @@ -864,6 +864,11 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, > > port->devfn = of_pci_get_devfn(child); > > if (port->devfn < 0) > > goto skip; > > + if (PCI_FUNC(port->devfn) != 0) { > > + dev_err(dev, "%s: invalid function number, must be zero\n", > > + port->name); > > + goto skip; > > + } > > > > ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM, > > &port->mem_target, &port->mem_attr); > > -- > > 2.20.1 > > _______________________________________________ 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:[~2022-01-07 18:18 UTC|newest] Thread overview: 72+ 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 ` Pali Rohár 2021-11-25 12:45 ` [PATCH 01/15] PCI: mvebu: Check for valid ports Pali Rohár 2021-11-25 12:45 ` 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 ` 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 2021-11-25 12:45 ` Pali Rohár 2022-01-07 18:15 ` Bjorn Helgaas 2022-01-07 18:15 ` Bjorn Helgaas 2022-01-07 18:18 ` Pali Rohár [this message] 2022-01-07 18:18 ` Pali Rohár 2022-01-07 21:09 ` Bjorn Helgaas 2022-01-07 21:09 ` Bjorn Helgaas 2022-01-07 21:58 ` Pali Rohár 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 2021-11-25 12:45 ` Pali Rohár 2022-01-07 18:45 ` Bjorn Helgaas 2022-01-07 18:45 ` Bjorn Helgaas 2022-01-07 19:15 ` Russell King (Oracle) 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 2021-11-25 12:45 ` Pali Rohár 2022-01-07 21:32 ` Bjorn Helgaas 2022-01-07 21:32 ` Bjorn Helgaas 2022-01-07 22:13 ` Pali Rohár 2022-01-07 22:13 ` Pali Rohár 2022-01-07 23:01 ` Bjorn Helgaas 2022-01-07 23:01 ` Bjorn Helgaas 2022-01-07 23:11 ` Pali Rohár 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 ` 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 ` 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 2021-11-25 12:45 ` Pali Rohár 2022-01-07 21:55 ` Bjorn Helgaas 2022-01-07 21:55 ` Bjorn Helgaas 2022-01-07 22:28 ` Pali Rohár 2022-01-07 22:28 ` Pali Rohár 2022-01-07 23:16 ` Bjorn Helgaas 2022-01-07 23:16 ` Bjorn Helgaas 2022-01-07 23:46 ` Pali Rohár 2022-01-07 23:46 ` Pali Rohár 2022-01-13 0:19 ` Bjorn Helgaas 2022-01-13 0:19 ` Bjorn Helgaas 2022-01-13 10:35 ` Pali Rohár 2022-01-13 10:35 ` Pali Rohár 2022-01-20 17:50 ` Bjorn Helgaas 2022-01-20 17:50 ` Bjorn Helgaas 2022-01-20 19:08 ` Pali Rohár 2022-01-20 19:08 ` Pali Rohár 2022-01-20 19:37 ` Bjorn Helgaas 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 12:45 ` 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 ` 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 ` 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 ` 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 ` 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 ` Pali Rohár 2021-11-25 12:46 ` [PATCH 15/15] PCI: mvebu: Fix support for DEVCAP2, DEVCTL2 and LNKCTL2 registers " Pali Rohár 2021-11-25 12:46 ` Pali Rohár 2022-01-04 15:04 ` [PATCH 00/15] pci: mvebu: Various fixes Lorenzo Pieralisi 2022-01-04 15:04 ` Lorenzo Pieralisi
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