On 2015. 7. 29., at PM 8:33, Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> 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@xxxxxxx> > Suggested-by: Russell King <linux@xxxxxxxxxxxxxxxx> > Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> > Cc: Pratyush Anand <pratyush.anand@xxxxxxxxx> > Cc: Arnd Bergmann <arnd@xxxxxxxx> > Cc: Jingoo Han <jingoohan1@xxxxxxxxx> Acked-by: Jingoo Han <jingoohan1@xxxxxxxxx> Best regards, Jingoo Han > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Cc: Simon Horman <horms@xxxxxxxxxxxx> > Cc: Russell King <linux@xxxxxxxxxxxxxxxx> > Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> > Cc: Thierry Reding <thierry.reding@xxxxxxxxx> > Cc: Michal Simek <michal.simek@xxxxxxxxxx> > Cc: Marc Zyngier <marc.zyngier@xxxxxxx> > --- > v3->v4 > > - Added conversion of designware and Xilinx PCI host controllers to > scan through pci_scan_root_bus_msi() > > v3: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/360020.html > > - 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 | 6 +++--- > drivers/pci/host/pcie-xilinx.c | 5 ++--- > drivers/pci/msi.c | 17 +---------------- > drivers/pci/probe.c | 15 +++++++++++++-- > include/linux/pci.h | 4 ++++ > 7 files changed, 26 insertions(+), 43 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..bd0aeec 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; > @@ -708,8 +707,9 @@ 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, > - &dw_pcie_ops, sys, &sys->resources); > + bus = pci_scan_root_bus_msi(pp->dev, sys->busnr, &dw_pcie_ops, sys, > + &sys->resources, &dw_pcie_msi_chip); > + > if (!bus) > return NULL; > > diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c > index f1a06a0..526807d 100644 > --- a/drivers/pci/host/pcie-xilinx.c > +++ b/drivers/pci/host/pcie-xilinx.c > @@ -647,8 +647,8 @@ 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, > - sys, &sys->resources); > + bus = pci_scan_root_bus_msi(port->dev, sys->busnr, &xilinx_pcie_ops, > + sys, &sys->resources, &xilinx_pcie_msi_chip); > > return bus; > } > @@ -847,7 +847,6 @@ 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@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
