diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0072-PCI-Introduce-new-MSI-chip-infrastructure.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0072-PCI-Introduce-new-MSI-chip-infrastructure.patch | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.10/0072-PCI-Introduce-new-MSI-chip-infrastructure.patch b/target/linux/mvebu/patches-3.10/0072-PCI-Introduce-new-MSI-chip-infrastructure.patch new file mode 100644 index 0000000..291a3b3 --- /dev/null +++ b/target/linux/mvebu/patches-3.10/0072-PCI-Introduce-new-MSI-chip-infrastructure.patch @@ -0,0 +1,108 @@ +From 9c6ddccbbfaf789beccc6a1d87abe9bc60dc570f Mon Sep 17 00:00:00 2001 +From: Thierry Reding <thierry.reding@avionic-design.de> +Date: Thu, 6 Jun 2013 18:20:29 +0200 +Subject: [PATCH 072/203] PCI: Introduce new MSI chip infrastructure + +The new struct msi_chip is used to associated an MSI controller with a +PCI bus. It is automatically handed down from the root to its children +during bus enumeration. + +This patch provides default (weak) implementations for the architecture- +specific MSI functions (arch_setup_msi_irq(), arch_teardown_msi_irq() +and arch_msi_check_device()) which check if a PCI device's bus has an +attached MSI chip and forward the call appropriately. + +Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Acked-by: Bjorn Helgaas <bhelgaas@google.com> +Tested-by: Daniel Price <daniel.price@gmail.com> +Tested-by: Thierry Reding <thierry.reding@gmail.com> +--- + drivers/pci/msi.c | 27 +++++++++++++++++++++++++-- + drivers/pci/probe.c | 1 + + include/linux/msi.h | 11 +++++++++++ + include/linux/pci.h | 1 + + 4 files changed, 38 insertions(+), 2 deletions(-) + +--- a/drivers/pci/msi.c ++++ b/drivers/pci/msi.c +@@ -32,16 +32,39 @@ static int pci_msi_enable = 1; + + int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) + { +- return -EINVAL; ++ struct msi_chip *chip = dev->bus->msi; ++ int err; ++ ++ if (!chip || !chip->setup_irq) ++ return -EINVAL; ++ ++ err = chip->setup_irq(chip, dev, desc); ++ if (err < 0) ++ return err; ++ ++ irq_set_chip_data(desc->irq, chip); ++ ++ return 0; + } + + void __weak arch_teardown_msi_irq(unsigned int irq) + { ++ struct msi_chip *chip = irq_get_chip_data(irq); ++ ++ if (!chip || !chip->teardown_irq) ++ return; ++ ++ chip->teardown_irq(chip, irq); + } + + int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type) + { +- return 0; ++ struct msi_chip *chip = dev->bus->msi; ++ ++ if (!chip || !chip->check_device) ++ return 0; ++ ++ return chip->check_device(chip, dev, nvec, type); + } + + int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +--- a/drivers/pci/probe.c ++++ b/drivers/pci/probe.c +@@ -634,6 +634,7 @@ static struct pci_bus *pci_alloc_child_b + + child->parent = parent; + child->ops = parent->ops; ++ child->msi = parent->msi; + child->sysdata = parent->sysdata; + child->bus_flags = parent->bus_flags; + +--- a/include/linux/msi.h ++++ b/include/linux/msi.h +@@ -64,4 +64,15 @@ void arch_restore_msi_irqs(struct pci_de + void default_teardown_msi_irqs(struct pci_dev *dev); + void default_restore_msi_irqs(struct pci_dev *dev, int irq); + ++struct msi_chip { ++ struct module *owner; ++ struct device *dev; ++ ++ int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev, ++ struct msi_desc *desc); ++ void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); ++ int (*check_device)(struct msi_chip *chip, struct pci_dev *dev, ++ int nvec, int type); ++}; ++ + #endif /* LINUX_MSI_H */ +--- a/include/linux/pci.h ++++ b/include/linux/pci.h +@@ -432,6 +432,7 @@ struct pci_bus { + struct resource busn_res; /* bus numbers routed to this bus */ + + struct pci_ops *ops; /* configuration access functions */ ++ struct msi_chip *msi; /* MSI controller */ + void *sysdata; /* hook for sys-specific extension */ + struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */ + |