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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 <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>
This commit is contained in:
Qing He 2010-10-11 15:30:09 +01:00 committed by Stefano Stabellini
parent 38aa66fcb7
commit f731e3ef02
3 changed files with 101 additions and 18 deletions
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55
arch/x86/pci/xen.c
View file

@ -135,14 +135,12 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
if (!v)
return -ENOMEM;
if (!xen_initial_domain()) {
if (type == PCI_CAP_ID_MSIX)
ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
else
ret = xen_pci_frontend_enable_msi(dev, &v);
if (ret)
goto error;
}
if (type == PCI_CAP_ID_MSIX)
ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
else
ret = xen_pci_frontend_enable_msi(dev, &v);
if (ret)
goto error;
i = 0;
list_for_each_entry(msidesc, &dev->msi_list, list) {
irq = xen_allocate_pirq(v[i], 0, /* not sharable */
@ -172,23 +170,40 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
static void xen_teardown_msi_irqs(struct pci_dev *dev)
{
/* Only do this when were are in non-privileged mode.*/
if (!xen_initial_domain()) {
struct msi_desc *msidesc;
msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
if (msidesc->msi_attrib.is_msix)
xen_pci_frontend_disable_msix(dev);
else
xen_pci_frontend_disable_msi(dev);
}
struct msi_desc *msidesc;
msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
if (msidesc->msi_attrib.is_msix)
xen_pci_frontend_disable_msix(dev);
else
xen_pci_frontend_disable_msi(dev);
}
static void xen_teardown_msi_irq(unsigned int irq)
{
xen_destroy_irq(irq);
}
static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int irq, ret;
struct msi_desc *msidesc;
list_for_each_entry(msidesc, &dev->msi_list, list) {
irq = xen_create_msi_irq(dev, msidesc, type);
if (irq < 0)
return -1;
ret = set_irq_msi(irq, msidesc);
if (ret)
goto error;
}
return 0;
error:
xen_destroy_irq(irq);
return ret;
}
#endif
static int xen_pcifront_enable_irq(struct pci_dev *dev)
@ -362,6 +377,10 @@ static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
static int __init pci_xen_initial_domain(void)
{
#ifdef CONFIG_PCI_MSI
x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
#endif
xen_setup_acpi_sci();
__acpi_register_gsi = acpi_register_gsi_xen;

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 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
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 @@ void xen_allocate_pirq_msi(char *name, int *irq, int *pirq)
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;

4
include/xen/events.h
View file

@ -72,8 +72,12 @@ void xen_hvm_evtchn_do_upcall(void);
* usual. */
int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);
#ifdef CONFIG_PCI_MSI
/* Allocate an irq and a pirq to be used with MSIs. */
void xen_allocate_pirq_msi(char *name, int *irq, int *pirq);
int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type);
#endif
/* De-allocates the above mentioned physical interrupt. */
int xen_destroy_irq(int irq);