From d873b4d449202bfb70aa56fd2c64f68ec281dfe9 Mon Sep 17 00:00:00 2001 From: Yijing Wang Date: Tue, 8 Jul 2014 10:07:23 +0800 Subject: [PATCH] PCI/MSI: Add msi_setup_entry() to clean up MSI initialization Move MSI entry stuff to a new function, msi_setup_entry(), to simplify msi_capability_init() as MSI-X does. Signed-off-by: Yijing Wang Signed-off-by: Bjorn Helgaas --- drivers/pci/msi.c | 51 ++++++++++++++++++++++++++++++----------------- 1 file changed, 33 insertions(+), 18 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 50a7e4e96da7..a59d673d074e 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -581,6 +581,38 @@ error_attrs: return ret; } +static struct msi_desc *msi_setup_entry(struct pci_dev *dev) +{ + u16 control; + struct msi_desc *entry; + + /* MSI Entry Initialization */ + entry = alloc_msi_entry(dev); + if (!entry) + return NULL; + + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); + + entry->msi_attrib.is_msix = 0; + entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT); + entry->msi_attrib.entry_nr = 0; + entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT); + entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */ + entry->msi_attrib.pos = dev->msi_cap; + entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1; + + if (control & PCI_MSI_FLAGS_64BIT) + entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64; + else + entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32; + + /* Save the initial mask status */ + if (entry->msi_attrib.maskbit) + pci_read_config_dword(dev, entry->mask_pos, &entry->masked); + + return entry; +} + /** * msi_capability_init - configure device's MSI capability structure * @dev: pointer to the pci_dev data structure of MSI device function @@ -596,32 +628,15 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) { struct msi_desc *entry; int ret; - u16 control; unsigned mask; msi_set_enable(dev, 0); /* Disable MSI during set up */ - pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); - /* MSI Entry Initialization */ - entry = alloc_msi_entry(dev); + entry = msi_setup_entry(dev); if (!entry) return -ENOMEM; - entry->msi_attrib.is_msix = 0; - entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT); - entry->msi_attrib.entry_nr = 0; - entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT); - entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */ - entry->msi_attrib.pos = dev->msi_cap; - entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1; - - if (control & PCI_MSI_FLAGS_64BIT) - entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64; - else - entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32; /* All MSIs are unmasked by default, Mask them all */ - if (entry->msi_attrib.maskbit) - pci_read_config_dword(dev, entry->mask_pos, &entry->masked); mask = msi_mask(entry->msi_attrib.multi_cap); msi_mask_irq(entry, mask, mask); -- 2.34.1