| Message ID | 20190129080926.36773-18-Zhiqiang.Hou@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | PCI: refactor Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs | expand |
ZQ, On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@nxp.com> wrote: > > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > Avoid to issue CFG transactions to link partner when the PCIe > link is not up. And allow CFG transactions to all functions of > Endpoint implemented multiple functions. > > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host > Bridge IP driver") > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com> > --- > V3: > - No change > > drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > index dc5324d94466..1ae82e790562 100644 > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) > { > struct mobiveil_pcie *pcie = bus->sysdata; > > + /* If there is no link, then there is no device */ > + if (bus->number > pcie->rp.root_bus_nr && !mobiveil_pcie_link_up(pcie)) > + return false; > + > /* Only one device down on each root port */ > if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0)) > return false; > @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) > * Do not read more than one device on the bus directly > * attached to RC > */ > - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0)) > + if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn) > 0)) here change "primary" to "number", as it's a bug in the original driver too. > return false; > > return true; > -- > 2.17.1 >
[+cc Thomas] On Fri, Feb 08, 2019 at 06:11:15PM +0530, Subrahmanya Lingappa wrote: > On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@nxp.com> wrote: > > > > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > > > Avoid to issue CFG transactions to link partner when the PCIe > > link is not up. And allow CFG transactions to all functions of > > Endpoint implemented multiple functions. > > > > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host > > Bridge IP driver") > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com> > > --- > > V3: > > - No change > > > > drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > index dc5324d94466..1ae82e790562 100644 > > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) > > { > > struct mobiveil_pcie *pcie = bus->sysdata; > > > > + /* If there is no link, then there is no device */ > > + if (bus->number > pcie->rp.root_bus_nr && !mobiveil_pcie_link_up(pcie)) > > + return false; > > + > > /* Only one device down on each root port */ > > if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0)) > > return false; > > @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) > > * Do not read more than one device on the bus directly > > * attached to RC > > */ > > - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0)) > > + if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn) > 0)) > here change "primary" to "number", as it's a bug in the original driver too. This looks like it should be split into two patches: (1) checking for link up, and (2) checking root_bus_nr. And if you mean "bus->primary == pcie->rp.root_bus_nr" is a bug in pci-aardvark.c, too, it is imperative to fix that bug also (with a separate patch). > > return false; > > > > return true; > > -- > > 2.17.1 > > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Hi Subbu, Thanks a lot for your comments! > -----Original Message----- > From: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in> > Sent: 2019年2月8日 20:41 > To: Z.q. Hou <zhiqiang.hou@nxp.com> > Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org; > devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; > bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com; > shawnguo@kernel.org; Leo Li <leoyang.li@nxp.com>; > lorenzo.pieralisi@arm.com; catalin.marinas@arm.com; > will.deacon@arm.com; Mingkai Hu <mingkai.hu@nxp.com>; M.h. Lian > <minghuan.lian@nxp.com>; Xiaowei Bao <xiaowei.bao@nxp.com> > Subject: Re: [PATCHv3 17/27] PCI: mobiveil: fix the checking of valid device > > ZQ, > > On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@nxp.com> wrote: > > > > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > > > Avoid to issue CFG transactions to link partner when the PCIe link is > > not up. And allow CFG transactions to all functions of Endpoint > > implemented multiple functions. > > > > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP > > driver") > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com> > > --- > > V3: > > - No change > > > > drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > index dc5324d94466..1ae82e790562 100644 > > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct > > pci_bus *bus, unsigned int devfn) { > > struct mobiveil_pcie *pcie = bus->sysdata; > > > > + /* If there is no link, then there is no device */ > > + if (bus->number > pcie->rp.root_bus_nr > && !mobiveil_pcie_link_up(pcie)) > > + return false; > > + > > /* Only one device down on each root port */ > > if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0)) > > return false; > > @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus > *bus, unsigned int devfn) > > * Do not read more than one device on the bus directly > > * attached to RC > > */ > > - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0)) > > + if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn) > > + > 0)) > here change "primary" to "number", as it's a bug in the original driver too. No, I think it should not change to "number", as this is to check the EP directly attached to RC, so if we change it to "bus->number", the "pcie->rp.root_bus_nr" should be changed to "pcie->rp.root_bus_nr +1" correspondingly. > > > return false; > > > > return true; > > -- > > 2.17.1 > > Thanks, Zhiqiang
Hi Bjorn, Thanks a lot for your comments! > -----Original Message----- > From: Bjorn Helgaas <helgaas@kernel.org> > Sent: 2019年2月8日 22:13 > To: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in> > Cc: Z.q. Hou <zhiqiang.hou@nxp.com>; mark.rutland@arm.com; > devicetree@vger.kernel.org; lorenzo.pieralisi@arm.com; Xiaowei Bao > <xiaowei.bao@nxp.com>; linux-pci@vger.kernel.org; will.deacon@arm.com; > linux-kernel@vger.kernel.org; Leo Li <leoyang.li@nxp.com>; M.h. Lian > <minghuan.lian@nxp.com>; robh+dt@kernel.org; Mingkai Hu > <mingkai.hu@nxp.com>; catalin.marinas@arm.com; shawnguo@kernel.org; > linux-arm-kernel@lists.infradead.org; Thomas Petazzoni > <thomas.petazzoni@bootlin.com> > Subject: Re: [PATCHv3 17/27] PCI: mobiveil: fix the checking of valid device > > [+cc Thomas] > > On Fri, Feb 08, 2019 at 06:11:15PM +0530, Subrahmanya Lingappa wrote: > > On Tue, Jan 29, 2019 at 1:40 PM Z.q. Hou <zhiqiang.hou@nxp.com> wrote: > > > > > > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > > > > > Avoid to issue CFG transactions to link partner when the PCIe link > > > is not up. And allow CFG transactions to all functions of Endpoint > > > implemented multiple functions. > > > > > > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge > > > IP driver") > > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> > > > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com> > > > --- > > > V3: > > > - No change > > > > > > drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 6 +++++- > > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > > b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > > index dc5324d94466..1ae82e790562 100644 > > > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c > > > @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct > > > pci_bus *bus, unsigned int devfn) { > > > struct mobiveil_pcie *pcie = bus->sysdata; > > > > > > + /* If there is no link, then there is no device */ > > > + if (bus->number > pcie->rp.root_bus_nr > && !mobiveil_pcie_link_up(pcie)) > > > + return false; > > > + > > > /* Only one device down on each root port */ > > > if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0)) > > > return false; > > > @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct > pci_bus *bus, unsigned int devfn) > > > * Do not read more than one device on the bus directly > > > * attached to RC > > > */ > > > - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0)) > > > + if ((bus->primary == pcie->rp.root_bus_nr) && > > > + (PCI_SLOT(devfn) > 0)) > > > here change "primary" to "number", as it's a bug in the original driver too. > > This looks like it should be split into two patches: (1) checking for link up, and > (2) checking root_bus_nr. Yes, will split this patch in next version. > > And if you mean "bus->primary == pcie->rp.root_bus_nr" is a bug in > pci-aardvark.c, too, it is imperative to fix that bug also (with a separate patch). It is not a bug, but the bug is to limit multiple function EP (devfn > 0). Thanks, Zhiqiang
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c index dc5324d94466..1ae82e790562 100644 --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c @@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) { struct mobiveil_pcie *pcie = bus->sysdata; + /* If there is no link, then there is no device */ + if (bus->number > pcie->rp.root_bus_nr && !mobiveil_pcie_link_up(pcie)) + return false; + /* Only one device down on each root port */ if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0)) return false; @@ -37,7 +41,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) * Do not read more than one device on the bus directly * attached to RC */ - if ((bus->primary == pcie->rp.root_bus_nr) && (devfn > 0)) + if ((bus->primary == pcie->rp.root_bus_nr) && (PCI_SLOT(devfn) > 0)) return false; return true;