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Subject[PATCH 06/14] xen: events: refactor GSI pirq bindings functions
Date
Following the example set by xen_allocate_pirq_msi and
xen_bind_pirq_msi_to_irq:

xen_allocate_pirq becomes xen_allocate_pirq_gsi and now only allocates
a pirq number and does not bind it.

xen_map_pirq_gsi becomes xen_bind_pirq_gsi_to_irq and binds an
existing pirq.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
arch/x86/pci/xen.c | 41 +++++++++++++++++++++++++++++------------
drivers/xen/events.c | 7 ++++---
include/xen/events.h | 10 +++++++---
3 files changed, 40 insertions(+), 18 deletions(-)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 8c4085a..e37b407 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -50,7 +50,7 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
name = "ioapic-level";
}

- irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
+ irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);

printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);

@@ -237,6 +237,7 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev)
{
int rc;
int share = 1;
+ int pirq;
u8 gsi;

rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
@@ -246,13 +247,21 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev)
return rc;
}

+ rc = xen_allocate_pirq_gsi(gsi);
+ if (rc < 0) {
+ dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
+ gsi, rc);
+ return rc;
+ }
+ pirq = rc;
+
if (gsi < NR_IRQS_LEGACY)
share = 0;

- rc = xen_allocate_pirq(gsi, share, "pcifront");
+ rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
if (rc < 0) {
- dev_warn(&dev->dev, "Xen PCI: failed to register GSI%d: %d\n",
- gsi, rc);
+ dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
+ gsi, pirq, rc);
return rc;
}

@@ -309,7 +318,7 @@ int __init pci_xen_hvm_init(void)
#ifdef CONFIG_XEN_DOM0
static int xen_register_pirq(u32 gsi, int triggering)
{
- int rc, irq;
+ int rc, pirq, irq = -1;
struct physdev_map_pirq map_irq;
int shareable = 0;
char *name;
@@ -325,17 +334,20 @@ static int xen_register_pirq(u32 gsi, int triggering)
name = "ioapic-level";
}

- irq = xen_allocate_pirq(gsi, shareable, name);
-
- printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
+ pirq = xen_allocate_pirq_gsi(gsi);
+ if (pirq < 0)
+ goto out;

+ irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
if (irq < 0)
goto out;

+ printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d\n", pirq, irq);
+
map_irq.domid = DOMID_SELF;
map_irq.type = MAP_PIRQ_TYPE_GSI;
map_irq.index = gsi;
- map_irq.pirq = irq;
+ map_irq.pirq = pirq;

rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
if (rc) {
@@ -422,13 +434,18 @@ static int __init pci_xen_initial_domain(void)

void __init xen_setup_pirqs(void)
{
- int irq;
+ int pirq, irq;

pci_xen_initial_domain();

if (0 == nr_ioapics) {
- for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
- xen_allocate_pirq(irq, 0, "xt-pic");
+ for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
+ pirq = xen_allocate_pirq_gsi(irq);
+ if (WARN(pirq < 0,
+ "Could not allocate PIRQ for legacy interrupt\n"))
+ break;
+ irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
+ }
return;
}

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index e828456..a40b2a1 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -568,9 +568,9 @@ static int find_irq_by_gsi(unsigned gsi)
return -1;
}

-int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
+int xen_allocate_pirq_gsi(unsigned gsi)
{
- return xen_map_pirq_gsi(gsi, gsi, shareable, name);
+ return gsi;
}

/*
@@ -580,7 +580,8 @@ int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
* Note: We don't assign an event channel until the irq actually started
* up. Return an existing irq if we've already got one for the gsi.
*/
-int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
+int xen_bind_pirq_gsi_to_irq(unsigned gsi,
+ unsigned pirq, int shareable, char *name)
{
int irq = -1;
struct physdev_irq irq_op;
diff --git a/include/xen/events.h b/include/xen/events.h
index 99a64f0..32ebeba 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -68,12 +68,16 @@ int xen_set_callback_via(uint64_t via);
void xen_evtchn_do_upcall(struct pt_regs *regs);
void xen_hvm_evtchn_do_upcall(void);

-/* Allocate an irq for a physical interrupt, given a gsi. */
-int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
-int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);
+/* Allocate a pirq for a physical interrupt, given a gsi. */
+int xen_allocate_pirq_gsi(unsigned gsi);
+/* Bind a pirq for a physical interrupt to an irq. */
+int xen_bind_pirq_gsi_to_irq(unsigned gsi,
+ unsigned pirq, int shareable, char *name);

#ifdef CONFIG_PCI_MSI
+/* Allocate a pirq for a MSI style physical interrupt. */
int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
+/* Bind an PSI pirq to an irq. */
int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
int pirq, int vector, const char *name);
#endif
--
1.5.6.5


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