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author | Qing He <qing.he@intel.com> | 2010-10-11 15:30:09 +0100 |
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committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-10-22 21:25:44 +0100 |
commit | f731e3ef02b4744f4d7ca2f63539b900e47db31f (patch) | |
tree | 865ef6f817c372b99f0b36dc6f2638df087d51e7 /drivers/xen/events.c | |
parent | 38aa66fcb79e0a46c24bba96b6f2b851a6ec2037 (diff) | |
download | linux-f731e3ef02b4744f4d7ca2f63539b900e47db31f.tar.gz linux-f731e3ef02b4744f4d7ca2f63539b900e47db31f.tar.bz2 linux-f731e3ef02b4744f4d7ca2f63539b900e47db31f.zip |
xen: remap MSIs into pirqs when running as initial domain
Implement xen_create_msi_irq to create an msi and remap it as pirq.
Use xen_create_msi_irq to implement an initial domain specific version
of setup_msi_irqs.
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/events.c')
-rw-r--r-- | drivers/xen/events.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index c649ac0aaeef..a7d9555e664d 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -29,6 +29,7 @@ #include <linux/bootmem.h> #include <linux/slab.h> #include <linux/irqnr.h> +#include <linux/pci.h> #include <asm/desc.h> #include <asm/ptrace.h> @@ -656,6 +657,10 @@ out: return irq; } +#ifdef CONFIG_PCI_MSI +#include <linux/msi.h> +#include "../pci/msi.h" + void xen_allocate_pirq_msi(char *name, int *irq, int *pirq) { spin_lock(&irq_mapping_update_lock); @@ -678,6 +683,61 @@ out: spin_unlock(&irq_mapping_update_lock); } +int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type) +{ + int irq = -1; + struct physdev_map_pirq map_irq; + int rc; + int pos; + u32 table_offset, bir; + + memset(&map_irq, 0, sizeof(map_irq)); + map_irq.domid = DOMID_SELF; + map_irq.type = MAP_PIRQ_TYPE_MSI; + map_irq.index = -1; + map_irq.pirq = -1; + map_irq.bus = dev->bus->number; + map_irq.devfn = dev->devfn; + + if (type == PCI_CAP_ID_MSIX) { + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + + pci_read_config_dword(dev, msix_table_offset_reg(pos), + &table_offset); + bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); + + map_irq.table_base = pci_resource_start(dev, bir); + map_irq.entry_nr = msidesc->msi_attrib.entry_nr; + } + + spin_lock(&irq_mapping_update_lock); + + irq = find_unbound_irq(); + + if (irq == -1) + goto out; + + rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq); + if (rc) { + printk(KERN_WARNING "xen map irq failed %d\n", rc); + + irq_free_desc(irq); + + irq = -1; + goto out; + } + irq_info[irq] = mk_pirq_info(0, map_irq.pirq, 0, map_irq.index); + + set_irq_chip_and_handler_name(irq, &xen_pirq_chip, + handle_level_irq, + (type == PCI_CAP_ID_MSIX) ? "msi-x":"msi"); + +out: + spin_unlock(&irq_mapping_update_lock); + return irq; +} +#endif + int xen_destroy_irq(int irq) { struct irq_desc *desc; |