From mboxrd@z Thu Jan 1 00:00:00 1970 From: suravee.suthikulpanit@amd.com (suravee.suthikulpanit at amd.com) Date: Mon, 10 Nov 2014 13:24:39 -0600 Subject: [PATCH 1/2] PCI: Add new pci_ops for setting MSI parent for PCI bus In-Reply-To: <1415647480-3320-1-git-send-email-suravee.suthikulpanit@amd.com> References: <1415647480-3320-1-git-send-email-suravee.suthikulpanit@amd.com> Message-ID: <1415647480-3320-2-git-send-email-suravee.suthikulpanit@amd.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Suravee Suthikulpanit In the pci_scan_root_bus, pci_bus is created and passed down to: pci_scan_child_bus pci_scan_bridge pci_add_new_bus pci_alloc_child_bus In pci_alloc_child_bus, the parent's msi_chip is propagated to child, and the referenced by PCI devices when calling arch_setup_msi_irq(). However, in the current implementation of pci_scan_root_bus, the msi_chip of the root_bus is not set before handing off to pci_scan_child_bus. This patch proposes a new callback function in the struct pci_ops to allow host controller to provide a call back for specifying msi_chip to be used. Cc: Bjorn Helgass Cc: Liviu Dudau Cc: Lorenzo Pieralisi Signed-off-by: Suravee Suthikulpanit --- drivers/pci/probe.c | 3 +++ include/linux/pci.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 5ed9930..cf7114d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2081,6 +2081,9 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, if (!b) return NULL; + if (ops->set_msi_parent) + ops->set_msi_parent(b); + if (!found) { dev_info(&b->dev, "No busn resource found for root bus, will use [bus %02x-ff]\n", diff --git a/include/linux/pci.h b/include/linux/pci.h index 5be8db4..6093544 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -560,6 +560,7 @@ static inline int pcibios_err_to_errno(int err) struct pci_ops { int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val); int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val); + int (*set_msi_parent)(struct pci_bus *bus); }; /* -- 1.9.3