| Message ID | 1438079535-11956-2-git-send-email-lorenzo.pieralisi@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 2015. 7. 28., at PM 7:32, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote: > > On ARM PCI systems relying on the pcibios API to initialize PCI host > controllers, the pcibios_msi_controller weak callback is used to look-up > the msi_controller pointer, through pci_sys_data msi_ctrl pointer. > > pci_sys_data is an ARM specific structure, which prevents using the > same mechanism (so same PCI host controller drivers) on ARM64 systems. > > Since the struct pci_bus already contains an msi_controller pointer and > the kernel already uses it to look-up the msi controller, > this patch converts ARM host controller and related pcibios/host bridges > initialization routines so that the msi_controller pointer look-up can be > carried out by PCI core code through the struct pci_bus msi pointer, > removing the need for the arch specific pcibios_msi_controller callback > and the related pci_sys_data msi_ctrl pointer. > > To simplify the conversion, this patch adds a new function in PCI > core code (pci_scan_root_bus_msi()) that takes the msi_controller > pointer as an additional parameter wrt pci_scan_root_bus() so that > the msi controller pointer can be effectively propagated at probe time > through the augmented API. > > The existing pci_scan_root_bus() API is made to rely on the newly > introduced function, by passing a NULL msi pointer to it so > that it can be used when no msi controller pointer passing is required > without additional code (and API conversions) in the core PCI layer. > > ARM is the only arch relying on the pcibios_msi_controller() weak > function, hence this patch also removes its default weak implementation > from PCI core code since it becomes of no use. > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Suggested-by: Russell King <linux@arm.linux.org.uk> > Acked-by: Marc Zyngier <marc.zyngier@arm.com> > Cc: Pratyush Anand <pratyush.anand@gmail.com> > Cc: Arnd Bergmann <arnd@arndb.de> > Cc: Jingoo Han <jingoohan1@gmail.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Simon Horman <horms@verge.net.au> > Cc: Russell King <linux@arm.linux.org.uk> > Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> > Cc: Thierry Reding <thierry.reding@gmail.com> > Cc: Michal Simek <michal.simek@xilinx.com> > Cc: Marc Zyngier <marc.zyngier@arm.com> > --- > v2->v3 > > - Added pci_scan_root_bus_msi() in core PCI code and converted ARM bios32 to > use it > > v2: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/359183.html > > v1->v2 > > - Added patch to replace panic statements with WARN > - Removed unused pcibios_msi_controller() and pci_msi_controller() from > core code > - Dropped RFT status > > v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/356028.html > > arch/arm/include/asm/mach/pci.h | 5 ----- > arch/arm/kernel/bios32.c | 17 +++-------------- > drivers/pci/host/pcie-designware.c | 9 +++++++-- > drivers/pci/host/pcie-xilinx.c | 12 ++++++++++-- > drivers/pci/msi.c | 17 +---------------- > drivers/pci/probe.c | 15 +++++++++++++-- > include/linux/pci.h | 4 ++++ > 7 files changed, 38 insertions(+), 41 deletions(-) > > diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h > index 28b9bb3..8857d28 100644 > --- a/arch/arm/include/asm/mach/pci.h > +++ b/arch/arm/include/asm/mach/pci.h > @@ -19,9 +19,7 @@ struct pci_bus; > struct device; > > struct hw_pci { > -#ifdef CONFIG_PCI_MSI > struct msi_controller *msi_ctrl; > -#endif > struct pci_ops *ops; > int nr_controllers; > void **private_data; > @@ -42,9 +40,6 @@ struct hw_pci { > * Per-controller structure > */ > struct pci_sys_data { > -#ifdef CONFIG_PCI_MSI > - struct msi_controller *msi_ctrl; > -#endif > struct list_head node; > int busnr; /* primary bus number */ > u64 mem_offset; /* bus->cpu memory mapping offset */ > diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c > index a5c782c..1a20076 100644 > --- a/arch/arm/kernel/bios32.c > +++ b/arch/arm/kernel/bios32.c > @@ -18,15 +18,6 @@ > > static int debug_pci; > > -#ifdef CONFIG_PCI_MSI > -struct msi_controller *pcibios_msi_controller(struct pci_dev *dev) > -{ > - struct pci_sys_data *sysdata = dev->bus->sysdata; > - > - return sysdata->msi_ctrl; > -} > -#endif > - > /* > * We can't use pci_get_device() here since we are > * called from interrupt context. > @@ -462,9 +453,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, > if (WARN(!sys, "PCI: unable to allocate sys data!")) > break; > > -#ifdef CONFIG_PCI_MSI > - sys->msi_ctrl = hw->msi_ctrl; > -#endif > sys->busnr = busnr; > sys->swizzle = hw->swizzle; > sys->map_irq = hw->map_irq; > @@ -486,8 +474,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, > if (hw->scan) > sys->bus = hw->scan(nr, sys); > else > - sys->bus = pci_scan_root_bus(parent, sys->busnr, > - hw->ops, sys, &sys->resources); > + sys->bus = pci_scan_root_bus_msi(parent, > + sys->busnr, hw->ops, sys, > + &sys->resources, hw->msi_ctrl); > > if (WARN(!sys->bus, "PCI: unable to scan bus!")) { > kfree(sys); > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c > index 69486be..e584dfa 100644 > --- a/drivers/pci/host/pcie-designware.c > +++ b/drivers/pci/host/pcie-designware.c > @@ -526,7 +526,6 @@ int dw_pcie_host_init(struct pcie_port *pp) > > #ifdef CONFIG_PCI_MSI > dw_pcie_msi_chip.dev = pp->dev; > - dw_pci.msi_ctrl = &dw_pcie_msi_chip; > #endif > > dw_pci.nr_controllers = 1; > @@ -708,11 +707,17 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys) > struct pcie_port *pp = sys_to_pcie(sys); > > pp->root_bus_nr = sys->busnr; > - bus = pci_scan_root_bus(pp->dev, sys->busnr, > + bus = pci_create_root_bus(pp->dev, sys->busnr, > &dw_pcie_ops, sys, &sys->resources); How about using pci_scan_root_bus_msi()? This is because pci_scan_root_bus_msi() adds the msi_controller to pci_bus. Thus, adding msi_controller and calling pci_scan_child_bus() is not necessary when pci_scan_root_bus_msi() is called here. If I am wrong, please let me know kindly. Thank you. Best regards, Jingoo Han > if (!bus) > return NULL; > > +#ifdef CONFIG_PCI_MSI > + bus->msi = &dw_pcie_msi_chip; > +#endif > + > + pci_scan_child_bus(bus); > + > if (bus && pp->ops->scan_bus) > pp->ops->scan_bus(pp); > > diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c > index f1a06a0..b21eb7d 100644 > --- a/drivers/pci/host/pcie-xilinx.c > +++ b/drivers/pci/host/pcie-xilinx.c > @@ -647,9 +647,18 @@ static struct pci_bus *xilinx_pcie_scan_bus(int nr, struct pci_sys_data *sys) > struct pci_bus *bus; > > port->root_busno = sys->busnr; > - bus = pci_scan_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, > + bus = pci_create_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, > sys, &sys->resources); > > + if (!bus) > + return NULL; > + > +#ifdef CONFIG_PCI_MSI > + bus->msi = &xilinx_pcie_msi_chip; > +#endif > + > + pci_scan_child_bus(bus); > + > return bus; > } > > @@ -847,7 +856,6 @@ static int xilinx_pcie_probe(struct platform_device *pdev) > > #ifdef CONFIG_PCI_MSI > xilinx_pcie_msi_chip.dev = port->dev; > - hw.msi_ctrl = &xilinx_pcie_msi_chip; > #endif > pci_common_init_dev(dev, &hw); > > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c > index f66be86..0d20142 100644 > --- a/drivers/pci/msi.c > +++ b/drivers/pci/msi.c > @@ -77,24 +77,9 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev) > > /* Arch hooks */ > > -struct msi_controller * __weak pcibios_msi_controller(struct pci_dev *dev) > -{ > - return NULL; > -} > - > -static struct msi_controller *pci_msi_controller(struct pci_dev *dev) > -{ > - struct msi_controller *msi_ctrl = dev->bus->msi; > - > - if (msi_ctrl) > - return msi_ctrl; > - > - return pcibios_msi_controller(dev); > -} > - > int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) > { > - struct msi_controller *chip = pci_msi_controller(dev); > + struct msi_controller *chip = dev->bus->msi; > int err; > > if (!chip || !chip->setup_irq) > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index cefd636..4915c6d 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -2096,8 +2096,9 @@ void pci_bus_release_busn_res(struct pci_bus *b) > res, ret ? "can not be" : "is"); > } > > -struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > - struct pci_ops *ops, void *sysdata, struct list_head *resources) > +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, > + struct pci_ops *ops, void *sysdata, > + struct list_head *resources, struct msi_controller *msi) > { > struct resource_entry *window; > bool found = false; > @@ -2114,6 +2115,8 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > if (!b) > return NULL; > > + b->msi = msi; > + > if (!found) { > dev_info(&b->dev, > "No busn resource found for root bus, will use [bus %02x-ff]\n", > @@ -2128,6 +2131,14 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > > return b; > } > +EXPORT_SYMBOL(pci_scan_root_bus_msi); > + > +struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > + struct pci_ops *ops, void *sysdata, struct list_head *resources) > +{ > + return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources, > + NULL); > +} > EXPORT_SYMBOL(pci_scan_root_bus); > > struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 8a0321a..4d4f9d2 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -787,6 +787,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, > int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax); > int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax); > void pci_bus_release_busn_res(struct pci_bus *b); > +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, > + struct pci_ops *ops, void *sysdata, > + struct list_head *resources, > + struct msi_controller *msi); > struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > struct pci_ops *ops, void *sysdata, > struct list_head *resources); > -- > 2.2.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Jul 29, 2015 at 09:32:01AM +0100, Jingoo Han wrote: > > On 2015. 7. 28., at PM 7:32, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote: > > > > On ARM PCI systems relying on the pcibios API to initialize PCI host > > controllers, the pcibios_msi_controller weak callback is used to look-up > > the msi_controller pointer, through pci_sys_data msi_ctrl pointer. > > > > pci_sys_data is an ARM specific structure, which prevents using the > > same mechanism (so same PCI host controller drivers) on ARM64 systems. > > > > Since the struct pci_bus already contains an msi_controller pointer and > > the kernel already uses it to look-up the msi controller, > > this patch converts ARM host controller and related pcibios/host bridges > > initialization routines so that the msi_controller pointer look-up can be > > carried out by PCI core code through the struct pci_bus msi pointer, > > removing the need for the arch specific pcibios_msi_controller callback > > and the related pci_sys_data msi_ctrl pointer. > > > > To simplify the conversion, this patch adds a new function in PCI > > core code (pci_scan_root_bus_msi()) that takes the msi_controller > > pointer as an additional parameter wrt pci_scan_root_bus() so that > > the msi controller pointer can be effectively propagated at probe time > > through the augmented API. > > > > The existing pci_scan_root_bus() API is made to rely on the newly > > introduced function, by passing a NULL msi pointer to it so > > that it can be used when no msi controller pointer passing is required > > without additional code (and API conversions) in the core PCI layer. > > > > ARM is the only arch relying on the pcibios_msi_controller() weak > > function, hence this patch also removes its default weak implementation > > from PCI core code since it becomes of no use. > > > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > > Suggested-by: Russell King <linux@arm.linux.org.uk> > > Acked-by: Marc Zyngier <marc.zyngier@arm.com> > > Cc: Pratyush Anand <pratyush.anand@gmail.com> > > Cc: Arnd Bergmann <arnd@arndb.de> > > Cc: Jingoo Han <jingoohan1@gmail.com> > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Cc: Simon Horman <horms@verge.net.au> > > Cc: Russell King <linux@arm.linux.org.uk> > > Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> > > Cc: Thierry Reding <thierry.reding@gmail.com> > > Cc: Michal Simek <michal.simek@xilinx.com> > > Cc: Marc Zyngier <marc.zyngier@arm.com> > > --- > > v2->v3 > > > > - Added pci_scan_root_bus_msi() in core PCI code and converted ARM bios32 to > > use it > > > > v2: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/359183.html > > > > v1->v2 > > > > - Added patch to replace panic statements with WARN > > - Removed unused pcibios_msi_controller() and pci_msi_controller() from > > core code > > - Dropped RFT status > > > > v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/356028.html > > > > arch/arm/include/asm/mach/pci.h | 5 ----- > > arch/arm/kernel/bios32.c | 17 +++-------------- > > drivers/pci/host/pcie-designware.c | 9 +++++++-- > > drivers/pci/host/pcie-xilinx.c | 12 ++++++++++-- > > drivers/pci/msi.c | 17 +---------------- > > drivers/pci/probe.c | 15 +++++++++++++-- > > include/linux/pci.h | 4 ++++ > > 7 files changed, 38 insertions(+), 41 deletions(-) > > > > diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h > > index 28b9bb3..8857d28 100644 > > --- a/arch/arm/include/asm/mach/pci.h > > +++ b/arch/arm/include/asm/mach/pci.h > > @@ -19,9 +19,7 @@ struct pci_bus; > > struct device; > > > > struct hw_pci { > > -#ifdef CONFIG_PCI_MSI > > struct msi_controller *msi_ctrl; > > -#endif > > struct pci_ops *ops; > > int nr_controllers; > > void **private_data; > > @@ -42,9 +40,6 @@ struct hw_pci { > > * Per-controller structure > > */ > > struct pci_sys_data { > > -#ifdef CONFIG_PCI_MSI > > - struct msi_controller *msi_ctrl; > > -#endif > > struct list_head node; > > int busnr; /* primary bus number */ > > u64 mem_offset; /* bus->cpu memory mapping offset */ > > diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c > > index a5c782c..1a20076 100644 > > --- a/arch/arm/kernel/bios32.c > > +++ b/arch/arm/kernel/bios32.c > > @@ -18,15 +18,6 @@ > > > > static int debug_pci; > > > > -#ifdef CONFIG_PCI_MSI > > -struct msi_controller *pcibios_msi_controller(struct pci_dev *dev) > > -{ > > - struct pci_sys_data *sysdata = dev->bus->sysdata; > > - > > - return sysdata->msi_ctrl; > > -} > > -#endif > > - > > /* > > * We can't use pci_get_device() here since we are > > * called from interrupt context. > > @@ -462,9 +453,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, > > if (WARN(!sys, "PCI: unable to allocate sys data!")) > > break; > > > > -#ifdef CONFIG_PCI_MSI > > - sys->msi_ctrl = hw->msi_ctrl; > > -#endif > > sys->busnr = busnr; > > sys->swizzle = hw->swizzle; > > sys->map_irq = hw->map_irq; > > @@ -486,8 +474,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, > > if (hw->scan) > > sys->bus = hw->scan(nr, sys); > > else > > - sys->bus = pci_scan_root_bus(parent, sys->busnr, > > - hw->ops, sys, &sys->resources); > > + sys->bus = pci_scan_root_bus_msi(parent, > > + sys->busnr, hw->ops, sys, > > + &sys->resources, hw->msi_ctrl); > > > > if (WARN(!sys->bus, "PCI: unable to scan bus!")) { > > kfree(sys); > > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c > > index 69486be..e584dfa 100644 > > --- a/drivers/pci/host/pcie-designware.c > > +++ b/drivers/pci/host/pcie-designware.c > > @@ -526,7 +526,6 @@ int dw_pcie_host_init(struct pcie_port *pp) > > > > #ifdef CONFIG_PCI_MSI > > dw_pcie_msi_chip.dev = pp->dev; > > - dw_pci.msi_ctrl = &dw_pcie_msi_chip; > > #endif > > > > dw_pci.nr_controllers = 1; > > @@ -708,11 +707,17 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys) > > struct pcie_port *pp = sys_to_pcie(sys); > > > > pp->root_bus_nr = sys->busnr; > > - bus = pci_scan_root_bus(pp->dev, sys->busnr, > > + bus = pci_create_root_bus(pp->dev, sys->busnr, > > &dw_pcie_ops, sys, &sys->resources); > > How about using pci_scan_root_bus_msi()? > This is because > pci_scan_root_bus_msi() adds the msi_controller to pci_bus. > Thus, adding msi_controller and calling pci_scan_child_bus() is not necessary > when pci_scan_root_bus_msi() is called here. > > If I am wrong, please let me know kindly. Thank you. No you are right, I will update this driver and xilinx too to use the new API, there is no reason to split the calls create/scan with the new pci_scan_root_bus_msi() API. Did you manage to test it ? Thanks ! Lorenzo > Best regards, > Jingoo Han > > > if (!bus) > > return NULL; > > > > +#ifdef CONFIG_PCI_MSI > > + bus->msi = &dw_pcie_msi_chip; > > +#endif > > + > > + pci_scan_child_bus(bus); > > + > > if (bus && pp->ops->scan_bus) > > pp->ops->scan_bus(pp); > > > > diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c > > index f1a06a0..b21eb7d 100644 > > --- a/drivers/pci/host/pcie-xilinx.c > > +++ b/drivers/pci/host/pcie-xilinx.c > > @@ -647,9 +647,18 @@ static struct pci_bus *xilinx_pcie_scan_bus(int nr, struct pci_sys_data *sys) > > struct pci_bus *bus; > > > > port->root_busno = sys->busnr; > > - bus = pci_scan_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, > > + bus = pci_create_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, > > sys, &sys->resources); > > > > + if (!bus) > > + return NULL; > > + > > +#ifdef CONFIG_PCI_MSI > > + bus->msi = &xilinx_pcie_msi_chip; > > +#endif > > + > > + pci_scan_child_bus(bus); > > + > > return bus; > > } > > > > @@ -847,7 +856,6 @@ static int xilinx_pcie_probe(struct platform_device *pdev) > > > > #ifdef CONFIG_PCI_MSI > > xilinx_pcie_msi_chip.dev = port->dev; > > - hw.msi_ctrl = &xilinx_pcie_msi_chip; > > #endif > > pci_common_init_dev(dev, &hw); > > > > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c > > index f66be86..0d20142 100644 > > --- a/drivers/pci/msi.c > > +++ b/drivers/pci/msi.c > > @@ -77,24 +77,9 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev) > > > > /* Arch hooks */ > > > > -struct msi_controller * __weak pcibios_msi_controller(struct pci_dev *dev) > > -{ > > - return NULL; > > -} > > - > > -static struct msi_controller *pci_msi_controller(struct pci_dev *dev) > > -{ > > - struct msi_controller *msi_ctrl = dev->bus->msi; > > - > > - if (msi_ctrl) > > - return msi_ctrl; > > - > > - return pcibios_msi_controller(dev); > > -} > > - > > int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) > > { > > - struct msi_controller *chip = pci_msi_controller(dev); > > + struct msi_controller *chip = dev->bus->msi; > > int err; > > > > if (!chip || !chip->setup_irq) > > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > > index cefd636..4915c6d 100644 > > --- a/drivers/pci/probe.c > > +++ b/drivers/pci/probe.c > > @@ -2096,8 +2096,9 @@ void pci_bus_release_busn_res(struct pci_bus *b) > > res, ret ? "can not be" : "is"); > > } > > > > -struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > > - struct pci_ops *ops, void *sysdata, struct list_head *resources) > > +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, > > + struct pci_ops *ops, void *sysdata, > > + struct list_head *resources, struct msi_controller *msi) > > { > > struct resource_entry *window; > > bool found = false; > > @@ -2114,6 +2115,8 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > > if (!b) > > return NULL; > > > > + b->msi = msi; > > + > > if (!found) { > > dev_info(&b->dev, > > "No busn resource found for root bus, will use [bus %02x-ff]\n", > > @@ -2128,6 +2131,14 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > > > > return b; > > } > > +EXPORT_SYMBOL(pci_scan_root_bus_msi); > > + > > +struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > > + struct pci_ops *ops, void *sysdata, struct list_head *resources) > > +{ > > + return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources, > > + NULL); > > +} > > EXPORT_SYMBOL(pci_scan_root_bus); > > > > struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, > > diff --git a/include/linux/pci.h b/include/linux/pci.h > > index 8a0321a..4d4f9d2 100644 > > --- a/include/linux/pci.h > > +++ b/include/linux/pci.h > > @@ -787,6 +787,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, > > int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax); > > int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax); > > void pci_bus_release_busn_res(struct pci_bus *b); > > +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, > > + struct pci_ops *ops, void *sysdata, > > + struct list_head *resources, > > + struct msi_controller *msi); > > struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, > > struct pci_ops *ops, void *sysdata, > > struct list_head *resources); > > -- > > 2.2.1 > > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2015. 7. 29., at AM 6:13, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote: > >> On Wed, Jul 29, 2015 at 09:32:01AM +0100, Jingoo Han wrote: >> >>> On 2015. 7. 28., at PM 7:32, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote: >>> >>> On ARM PCI systems relying on the pcibios API to initialize PCI host >>> controllers, the pcibios_msi_controller weak callback is used to look-up >>> the msi_controller pointer, through pci_sys_data msi_ctrl pointer. >>> >>> pci_sys_data is an ARM specific structure, which prevents using the >>> same mechanism (so same PCI host controller drivers) on ARM64 systems. >>> >>> Since the struct pci_bus already contains an msi_controller pointer and >>> the kernel already uses it to look-up the msi controller, >>> this patch converts ARM host controller and related pcibios/host bridges >>> initialization routines so that the msi_controller pointer look-up can be >>> carried out by PCI core code through the struct pci_bus msi pointer, >>> removing the need for the arch specific pcibios_msi_controller callback >>> and the related pci_sys_data msi_ctrl pointer. >>> >>> To simplify the conversion, this patch adds a new function in PCI >>> core code (pci_scan_root_bus_msi()) that takes the msi_controller >>> pointer as an additional parameter wrt pci_scan_root_bus() so that >>> the msi controller pointer can be effectively propagated at probe time >>> through the augmented API. >>> >>> The existing pci_scan_root_bus() API is made to rely on the newly >>> introduced function, by passing a NULL msi pointer to it so >>> that it can be used when no msi controller pointer passing is required >>> without additional code (and API conversions) in the core PCI layer. >>> >>> ARM is the only arch relying on the pcibios_msi_controller() weak >>> function, hence this patch also removes its default weak implementation >>> from PCI core code since it becomes of no use. >>> >>> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> >>> Suggested-by: Russell King <linux@arm.linux.org.uk> >>> Acked-by: Marc Zyngier <marc.zyngier@arm.com> >>> Cc: Pratyush Anand <pratyush.anand@gmail.com> >>> Cc: Arnd Bergmann <arnd@arndb.de> >>> Cc: Jingoo Han <jingoohan1@gmail.com> >>> Cc: Bjorn Helgaas <bhelgaas@google.com> >>> Cc: Simon Horman <horms@verge.net.au> >>> Cc: Russell King <linux@arm.linux.org.uk> >>> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> >>> Cc: Thierry Reding <thierry.reding@gmail.com> >>> Cc: Michal Simek <michal.simek@xilinx.com> >>> Cc: Marc Zyngier <marc.zyngier@arm.com> >>> --- >>> v2->v3 >>> >>> - Added pci_scan_root_bus_msi() in core PCI code and converted ARM bios32 to >>> use it >>> >>> v2: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/359183.html >>> >>> v1->v2 >>> >>> - Added patch to replace panic statements with WARN >>> - Removed unused pcibios_msi_controller() and pci_msi_controller() from >>> core code >>> - Dropped RFT status >>> >>> v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/356028.html >>> >>> arch/arm/include/asm/mach/pci.h | 5 ----- >>> arch/arm/kernel/bios32.c | 17 +++-------------- >>> drivers/pci/host/pcie-designware.c | 9 +++++++-- >>> drivers/pci/host/pcie-xilinx.c | 12 ++++++++++-- >>> drivers/pci/msi.c | 17 +---------------- >>> drivers/pci/probe.c | 15 +++++++++++++-- >>> include/linux/pci.h | 4 ++++ >>> 7 files changed, 38 insertions(+), 41 deletions(-) >>> >>> diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h >>> index 28b9bb3..8857d28 100644 >>> --- a/arch/arm/include/asm/mach/pci.h >>> +++ b/arch/arm/include/asm/mach/pci.h >>> @@ -19,9 +19,7 @@ struct pci_bus; >>> struct device; >>> >>> struct hw_pci { >>> -#ifdef CONFIG_PCI_MSI >>> struct msi_controller *msi_ctrl; >>> -#endif >>> struct pci_ops *ops; >>> int nr_controllers; >>> void **private_data; >>> @@ -42,9 +40,6 @@ struct hw_pci { >>> * Per-controller structure >>> */ >>> struct pci_sys_data { >>> -#ifdef CONFIG_PCI_MSI >>> - struct msi_controller *msi_ctrl; >>> -#endif >>> struct list_head node; >>> int busnr; /* primary bus number */ >>> u64 mem_offset; /* bus->cpu memory mapping offset */ >>> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c >>> index a5c782c..1a20076 100644 >>> --- a/arch/arm/kernel/bios32.c >>> +++ b/arch/arm/kernel/bios32.c >>> @@ -18,15 +18,6 @@ >>> >>> static int debug_pci; >>> >>> -#ifdef CONFIG_PCI_MSI >>> -struct msi_controller *pcibios_msi_controller(struct pci_dev *dev) >>> -{ >>> - struct pci_sys_data *sysdata = dev->bus->sysdata; >>> - >>> - return sysdata->msi_ctrl; >>> -} >>> -#endif >>> - >>> /* >>> * We can't use pci_get_device() here since we are >>> * called from interrupt context. >>> @@ -462,9 +453,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, >>> if (WARN(!sys, "PCI: unable to allocate sys data!")) >>> break; >>> >>> -#ifdef CONFIG_PCI_MSI >>> - sys->msi_ctrl = hw->msi_ctrl; >>> -#endif >>> sys->busnr = busnr; >>> sys->swizzle = hw->swizzle; >>> sys->map_irq = hw->map_irq; >>> @@ -486,8 +474,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, >>> if (hw->scan) >>> sys->bus = hw->scan(nr, sys); >>> else >>> - sys->bus = pci_scan_root_bus(parent, sys->busnr, >>> - hw->ops, sys, &sys->resources); >>> + sys->bus = pci_scan_root_bus_msi(parent, >>> + sys->busnr, hw->ops, sys, >>> + &sys->resources, hw->msi_ctrl); >>> >>> if (WARN(!sys->bus, "PCI: unable to scan bus!")) { >>> kfree(sys); >>> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c >>> index 69486be..e584dfa 100644 >>> --- a/drivers/pci/host/pcie-designware.c >>> +++ b/drivers/pci/host/pcie-designware.c >>> @@ -526,7 +526,6 @@ int dw_pcie_host_init(struct pcie_port *pp) >>> >>> #ifdef CONFIG_PCI_MSI >>> dw_pcie_msi_chip.dev = pp->dev; >>> - dw_pci.msi_ctrl = &dw_pcie_msi_chip; >>> #endif >>> >>> dw_pci.nr_controllers = 1; >>> @@ -708,11 +707,17 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys) >>> struct pcie_port *pp = sys_to_pcie(sys); >>> >>> pp->root_bus_nr = sys->busnr; >>> - bus = pci_scan_root_bus(pp->dev, sys->busnr, >>> + bus = pci_create_root_bus(pp->dev, sys->busnr, >>> &dw_pcie_ops, sys, &sys->resources); >> >> How about using pci_scan_root_bus_msi()? >> This is because >> pci_scan_root_bus_msi() adds the msi_controller to pci_bus. >> Thus, adding msi_controller and calling pci_scan_child_bus() is not necessary >> when pci_scan_root_bus_msi() is called here. >> >> If I am wrong, please let me know kindly. Thank you. > > No you are right, I will update this driver and xilinx too to use > the new API, there is no reason to split the calls create/scan > with the new pci_scan_root_bus_msi() API. > > Did you manage to test it ? Sorry, I cannot test it. I don't have the Exynos boards to test MSI feature. So, I can just review patches. Best regards, Jingoo Han > Thanks ! > Lorenzo > >> Best regards, >> Jingoo Han >> >>> if (!bus) >>> return NULL; >>> >>> +#ifdef CONFIG_PCI_MSI >>> + bus->msi = &dw_pcie_msi_chip; >>> +#endif >>> + >>> + pci_scan_child_bus(bus); >>> + >>> if (bus && pp->ops->scan_bus) >>> pp->ops->scan_bus(pp); >>> >>> diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c >>> index f1a06a0..b21eb7d 100644 >>> --- a/drivers/pci/host/pcie-xilinx.c >>> +++ b/drivers/pci/host/pcie-xilinx.c >>> @@ -647,9 +647,18 @@ static struct pci_bus *xilinx_pcie_scan_bus(int nr, struct pci_sys_data *sys) >>> struct pci_bus *bus; >>> >>> port->root_busno = sys->busnr; >>> - bus = pci_scan_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, >>> + bus = pci_create_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, >>> sys, &sys->resources); >>> >>> + if (!bus) >>> + return NULL; >>> + >>> +#ifdef CONFIG_PCI_MSI >>> + bus->msi = &xilinx_pcie_msi_chip; >>> +#endif >>> + >>> + pci_scan_child_bus(bus); >>> + >>> return bus; >>> } >>> >>> @@ -847,7 +856,6 @@ static int xilinx_pcie_probe(struct platform_device *pdev) >>> >>> #ifdef CONFIG_PCI_MSI >>> xilinx_pcie_msi_chip.dev = port->dev; >>> - hw.msi_ctrl = &xilinx_pcie_msi_chip; >>> #endif >>> pci_common_init_dev(dev, &hw); >>> >>> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c >>> index f66be86..0d20142 100644 >>> --- a/drivers/pci/msi.c >>> +++ b/drivers/pci/msi.c >>> @@ -77,24 +77,9 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev) >>> >>> /* Arch hooks */ >>> >>> -struct msi_controller * __weak pcibios_msi_controller(struct pci_dev *dev) >>> -{ >>> - return NULL; >>> -} >>> - >>> -static struct msi_controller *pci_msi_controller(struct pci_dev *dev) >>> -{ >>> - struct msi_controller *msi_ctrl = dev->bus->msi; >>> - >>> - if (msi_ctrl) >>> - return msi_ctrl; >>> - >>> - return pcibios_msi_controller(dev); >>> -} >>> - >>> int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) >>> { >>> - struct msi_controller *chip = pci_msi_controller(dev); >>> + struct msi_controller *chip = dev->bus->msi; >>> int err; >>> >>> if (!chip || !chip->setup_irq) >>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c >>> index cefd636..4915c6d 100644 >>> --- a/drivers/pci/probe.c >>> +++ b/drivers/pci/probe.c >>> @@ -2096,8 +2096,9 @@ void pci_bus_release_busn_res(struct pci_bus *b) >>> res, ret ? "can not be" : "is"); >>> } >>> >>> -struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, >>> - struct pci_ops *ops, void *sysdata, struct list_head *resources) >>> +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, >>> + struct pci_ops *ops, void *sysdata, >>> + struct list_head *resources, struct msi_controller *msi) >>> { >>> struct resource_entry *window; >>> bool found = false; >>> @@ -2114,6 +2115,8 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, >>> if (!b) >>> return NULL; >>> >>> + b->msi = msi; >>> + >>> if (!found) { >>> dev_info(&b->dev, >>> "No busn resource found for root bus, will use [bus %02x-ff]\n", >>> @@ -2128,6 +2131,14 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, >>> >>> return b; >>> } >>> +EXPORT_SYMBOL(pci_scan_root_bus_msi); >>> + >>> +struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, >>> + struct pci_ops *ops, void *sysdata, struct list_head *resources) >>> +{ >>> + return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources, >>> + NULL); >>> +} >>> EXPORT_SYMBOL(pci_scan_root_bus); >>> >>> struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, >>> diff --git a/include/linux/pci.h b/include/linux/pci.h >>> index 8a0321a..4d4f9d2 100644 >>> --- a/include/linux/pci.h >>> +++ b/include/linux/pci.h >>> @@ -787,6 +787,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, >>> int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax); >>> int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax); >>> void pci_bus_release_busn_res(struct pci_bus *b); >>> +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, >>> + struct pci_ops *ops, void *sysdata, >>> + struct list_head *resources, >>> + struct msi_controller *msi); >>> struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, >>> struct pci_ops *ops, void *sysdata, >>> struct list_head *resources); >>> -- >>> 2.2.1 >> -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h index 28b9bb3..8857d28 100644 --- a/arch/arm/include/asm/mach/pci.h +++ b/arch/arm/include/asm/mach/pci.h @@ -19,9 +19,7 @@ struct pci_bus; struct device; struct hw_pci { -#ifdef CONFIG_PCI_MSI struct msi_controller *msi_ctrl; -#endif struct pci_ops *ops; int nr_controllers; void **private_data; @@ -42,9 +40,6 @@ struct hw_pci { * Per-controller structure */ struct pci_sys_data { -#ifdef CONFIG_PCI_MSI - struct msi_controller *msi_ctrl; -#endif struct list_head node; int busnr; /* primary bus number */ u64 mem_offset; /* bus->cpu memory mapping offset */ diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index a5c782c..1a20076 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -18,15 +18,6 @@ static int debug_pci; -#ifdef CONFIG_PCI_MSI -struct msi_controller *pcibios_msi_controller(struct pci_dev *dev) -{ - struct pci_sys_data *sysdata = dev->bus->sysdata; - - return sysdata->msi_ctrl; -} -#endif - /* * We can't use pci_get_device() here since we are * called from interrupt context. @@ -462,9 +453,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, if (WARN(!sys, "PCI: unable to allocate sys data!")) break; -#ifdef CONFIG_PCI_MSI - sys->msi_ctrl = hw->msi_ctrl; -#endif sys->busnr = busnr; sys->swizzle = hw->swizzle; sys->map_irq = hw->map_irq; @@ -486,8 +474,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, if (hw->scan) sys->bus = hw->scan(nr, sys); else - sys->bus = pci_scan_root_bus(parent, sys->busnr, - hw->ops, sys, &sys->resources); + sys->bus = pci_scan_root_bus_msi(parent, + sys->busnr, hw->ops, sys, + &sys->resources, hw->msi_ctrl); if (WARN(!sys->bus, "PCI: unable to scan bus!")) { kfree(sys); diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 69486be..e584dfa 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -526,7 +526,6 @@ int dw_pcie_host_init(struct pcie_port *pp) #ifdef CONFIG_PCI_MSI dw_pcie_msi_chip.dev = pp->dev; - dw_pci.msi_ctrl = &dw_pcie_msi_chip; #endif dw_pci.nr_controllers = 1; @@ -708,11 +707,17 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys) struct pcie_port *pp = sys_to_pcie(sys); pp->root_bus_nr = sys->busnr; - bus = pci_scan_root_bus(pp->dev, sys->busnr, + bus = pci_create_root_bus(pp->dev, sys->busnr, &dw_pcie_ops, sys, &sys->resources); if (!bus) return NULL; +#ifdef CONFIG_PCI_MSI + bus->msi = &dw_pcie_msi_chip; +#endif + + pci_scan_child_bus(bus); + if (bus && pp->ops->scan_bus) pp->ops->scan_bus(pp); diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c index f1a06a0..b21eb7d 100644 --- a/drivers/pci/host/pcie-xilinx.c +++ b/drivers/pci/host/pcie-xilinx.c @@ -647,9 +647,18 @@ static struct pci_bus *xilinx_pcie_scan_bus(int nr, struct pci_sys_data *sys) struct pci_bus *bus; port->root_busno = sys->busnr; - bus = pci_scan_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, + bus = pci_create_root_bus(port->dev, sys->busnr, &xilinx_pcie_ops, sys, &sys->resources); + if (!bus) + return NULL; + +#ifdef CONFIG_PCI_MSI + bus->msi = &xilinx_pcie_msi_chip; +#endif + + pci_scan_child_bus(bus); + return bus; } @@ -847,7 +856,6 @@ static int xilinx_pcie_probe(struct platform_device *pdev) #ifdef CONFIG_PCI_MSI xilinx_pcie_msi_chip.dev = port->dev; - hw.msi_ctrl = &xilinx_pcie_msi_chip; #endif pci_common_init_dev(dev, &hw); diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index f66be86..0d20142 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -77,24 +77,9 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev) /* Arch hooks */ -struct msi_controller * __weak pcibios_msi_controller(struct pci_dev *dev) -{ - return NULL; -} - -static struct msi_controller *pci_msi_controller(struct pci_dev *dev) -{ - struct msi_controller *msi_ctrl = dev->bus->msi; - - if (msi_ctrl) - return msi_ctrl; - - return pcibios_msi_controller(dev); -} - int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) { - struct msi_controller *chip = pci_msi_controller(dev); + struct msi_controller *chip = dev->bus->msi; int err; if (!chip || !chip->setup_irq) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index cefd636..4915c6d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2096,8 +2096,9 @@ void pci_bus_release_busn_res(struct pci_bus *b) res, ret ? "can not be" : "is"); } -struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, - struct pci_ops *ops, void *sysdata, struct list_head *resources) +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, + struct pci_ops *ops, void *sysdata, + struct list_head *resources, struct msi_controller *msi) { struct resource_entry *window; bool found = false; @@ -2114,6 +2115,8 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, if (!b) return NULL; + b->msi = msi; + if (!found) { dev_info(&b->dev, "No busn resource found for root bus, will use [bus %02x-ff]\n", @@ -2128,6 +2131,14 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, return b; } +EXPORT_SYMBOL(pci_scan_root_bus_msi); + +struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, + struct pci_ops *ops, void *sysdata, struct list_head *resources) +{ + return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources, + NULL); +} EXPORT_SYMBOL(pci_scan_root_bus); struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, diff --git a/include/linux/pci.h b/include/linux/pci.h index 8a0321a..4d4f9d2 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -787,6 +787,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax); int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax); void pci_bus_release_busn_res(struct pci_bus *b); +struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, + struct pci_ops *ops, void *sysdata, + struct list_head *resources, + struct msi_controller *msi); struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata, struct list_head *resources);