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[Xen-devel] [PATCH 06/14] xen: events: refactor GSI pirq bindings functi

To: xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 06/14] xen: events: refactor GSI pirq bindings functions
From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Date: Wed, 9 Mar 2011 17:41:18 +0000
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, Ian Campbell <ian.campbell@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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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@xxxxxxxxxx>
---
 arch/x86/pci/xen.c   |   40 ++++++++++++++++++++++++++++------------
 drivers/xen/events.c |    7 ++++---
 include/xen/events.h |   10 +++++++---
 3 files changed, 39 insertions(+), 18 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 8c4085a..b0fb79d 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 +434,17 @@ 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 (pirq < 0)
+                               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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