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xen: remap MSIs into pirqs when running as initial domain

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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 <[email protected]>
Signed-off-by: Yunhong Jiang <[email protected]>
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Stefano Stabellini <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Qing He 2010-10-11 15:30:09 +01:00 • committed by Stefano Stabellini
commit f731e3ef02
3 changed files with 101 additions and 18 deletions
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60
drivers/xen/events.c
View file

@ -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;