[PATCH v2 07/16] xen/arm: IRQ: Move IRQ management from gic.c to irq.c

[Julien Grall <julien.grall@linaro.org>]

The file gic.c contains functions and variables which is not related to the GIC:
    - release_irq
    - setup_irq
    - gic_route_irq_to_guest
    - {,local_}irq_desc

Move all theses functions/variables in irq.c and split gic_route_irq_to_guest
in 2 parts:
    - route_dt_irq_to_guest: setup the desc
    - gic_route_irq_to_guest: setup correctly the GIC and the desc
    handler

Signed-off-by: Julien Grall <julien.grall@linaro.org>

---
    Changes in v2:
        - Patch added
---
 xen/arch/arm/domain_build.c |    2 +-
 xen/arch/arm/gic.c          |  125 ++++++++-----------------------------------
 xen/arch/arm/irq.c          |   97 +++++++++++++++++++++++++++++++++
 xen/include/asm-arm/gic.h   |    7 +--
 xen/include/asm-arm/irq.h   |    3 ++
 5 files changed, 126 insertions(+), 108 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 2035390..e7b1674 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -719,7 +719,7 @@ static int map_device(struct domain *d, const struct dt_device_node *dev)
 
         DPRINT("irq %u = %u type = 0x%x\n", i, irq.irq, irq.type);
         /* Don't check return because the IRQ can be use by multiple device */
-        gic_route_irq_to_guest(d, &irq, dt_node_name(dev));
+        route_dt_irq_to_guest(d, &irq, dt_node_name(dev));
     }
 
     /* Map the address ranges */
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 36cf93d..82e0316 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -52,8 +52,6 @@ static struct {
     spinlock_t lock;
 } gic;
 
-static irq_desc_t irq_desc[NR_IRQS];
-static DEFINE_PER_CPU(irq_desc_t[NR_LOCAL_IRQS], local_irq_desc);
 static DEFINE_PER_CPU(uint64_t, lr_mask);
 
 static unsigned nr_lrs;
@@ -88,12 +86,6 @@ unsigned int gic_number_lines(void)
     return gic.lines;
 }
 
-irq_desc_t *__irq_to_desc(int irq)
-{
-    if (irq < NR_LOCAL_IRQS) return &this_cpu(local_irq_desc)[irq];
-    return &irq_desc[irq-NR_LOCAL_IRQS];
-}
-
 void gic_save_state(struct vcpu *v)
 {
     int i;
@@ -282,6 +274,27 @@ static int gic_route_irq(unsigned int irq, bool_t level,
     return 0;
 }
 
+/* Program the GIC to route an interrupt to a guest
+ *   - desc.lock must be held
+ */
+void gic_route_irq_to_guest(struct domain *d, struct irq_desc *desc,
+                            bool_t level, const cpumask_t *cpu_mask,
+                            unsigned int priority)
+{
+    struct pending_irq *p;
+    ASSERT(spin_is_locked(&desc->lock));
+
+    desc->handler = &gic_guest_irq_type;
+    desc->status |= IRQ_GUEST;
+
+    gic_set_irq_properties(desc->irq, level, cpumask_of(smp_processor_id()),
+                           GIC_PRI_IRQ);
+
+    /* TODO: do not assume delivery to vcpu0 */
+    p = irq_to_pending(d->vcpu[0], desc->irq);
+    p->desc = desc;
+}
+
 /* Program the GIC to route an interrupt with a dt_irq */
 void gic_route_dt_irq(const struct dt_irq *irq, const cpumask_t *cpu_mask,
                       unsigned int priority)
@@ -570,59 +583,6 @@ void gic_route_spis(void)
     }
 }
 
-void release_irq(unsigned int irq)
-{
-    struct irq_desc *desc;
-    unsigned long flags;
-   struct irqaction *action;
-
-    desc = irq_to_desc(irq);
-
-    desc->handler->shutdown(desc);
-
-    spin_lock_irqsave(&desc->lock,flags);
-    action = desc->action;
-    desc->action  = NULL;
-    desc->status &= ~IRQ_GUEST;
-
-    spin_unlock_irqrestore(&desc->lock,flags);
-
-    /* Wait to make sure it's not being used on another CPU */
-    do { smp_mb(); } while ( desc->status & IRQ_INPROGRESS );
-
-    if (action && action->free_on_release)
-        xfree(action);
-}
-
-static int __setup_irq(struct irq_desc *desc, struct irqaction *new)
-{
-    if ( desc->action != NULL )
-        return -EBUSY;
-
-    desc->action  = new;
-    dsb(sy);
-
-    return 0;
-}
-
-int setup_dt_irq(const struct dt_irq *irq, struct irqaction *new)
-{
-    int rc;
-    unsigned long flags;
-    struct irq_desc *desc;
-
-    desc = irq_to_desc(irq->irq);
-
-    spin_lock_irqsave(&desc->lock, flags);
-    rc = __setup_irq(desc, new);
-    spin_unlock_irqrestore(&desc->lock, flags);
-
-    if ( !rc )
-        desc->handler->startup(desc);
-
-    return rc;
-}
-
 static inline void gic_set_lr(int lr, struct pending_irq *p,
         unsigned int state)
 {
@@ -761,49 +721,6 @@ void gic_inject(void)
         gic_inject_irq_start();
 }
 
-int gic_route_irq_to_guest(struct domain *d, const struct dt_irq *irq,
-                           const char * devname)
-{
-    struct irqaction *action;
-    struct irq_desc *desc = irq_to_desc(irq->irq);
-    unsigned long flags;
-    int retval;
-    bool_t level;
-    struct pending_irq *p;
-
-    action = xmalloc(struct irqaction);
-    if (!action)
-        return -ENOMEM;
-
-    action->dev_id = d;
-    action->name = devname;
-    action->free_on_release = 1;
-
-    spin_lock_irqsave(&desc->lock, flags);
-
-    desc->handler = &gic_guest_irq_type;
-    desc->status |= IRQ_GUEST;
-
-    level = dt_irq_is_level_triggered(irq);
-
-    gic_set_irq_properties(irq->irq, level, cpumask_of(smp_processor_id()),
-                           GIC_PRI_IRQ);
-
-    retval = __setup_irq(desc, action);
-    if (retval) {
-        xfree(action);
-        goto out;
-    }
-
-    /* TODO: do not assume delivery to vcpu0 */
-    p = irq_to_pending(d->vcpu[0], irq->irq);
-    p->desc = desc;
-
-out:
-    spin_unlock_irqrestore(&desc->lock, flags);
-    return retval;
-}
-
 static void do_sgi(struct cpu_user_regs *regs, int othercpu, enum gic_sgi sgi)
 {
     /* Lower the priority */
diff --git a/xen/arch/arm/irq.c b/xen/arch/arm/irq.c
index b3bfebc..f3a30bd 100644
--- a/xen/arch/arm/irq.c
+++ b/xen/arch/arm/irq.c
@@ -44,6 +44,15 @@ hw_irq_controller no_irq_type = {
     .end = end_none
 };
 
+static irq_desc_t irq_desc[NR_IRQS];
+static DEFINE_PER_CPU(irq_desc_t[NR_LOCAL_IRQS], local_irq_desc);
+
+irq_desc_t *__irq_to_desc(int irq)
+{
+    if (irq < NR_LOCAL_IRQS) return &this_cpu(local_irq_desc)[irq];
+    return &irq_desc[irq-NR_LOCAL_IRQS];
+}
+
 int __init arch_init_one_irq_desc(struct irq_desc *desc)
 {
     return 0;
@@ -188,6 +197,94 @@ out_no_end:
     irq_exit();
 }
 
+void release_irq(unsigned int irq)
+{
+    struct irq_desc *desc;
+    unsigned long flags;
+   struct irqaction *action;
+
+    desc = irq_to_desc(irq);
+
+    desc->handler->shutdown(desc);
+
+    spin_lock_irqsave(&desc->lock,flags);
+    action = desc->action;
+    desc->action  = NULL;
+    desc->status &= ~IRQ_GUEST;
+
+    spin_unlock_irqrestore(&desc->lock,flags);
+
+    /* Wait to make sure it's not being used on another CPU */
+    do { smp_mb(); } while ( desc->status & IRQ_INPROGRESS );
+
+    if ( action && action->free_on_release )
+        xfree(action);
+}
+
+static int __setup_irq(struct irq_desc *desc, struct irqaction *new)
+{
+    if ( desc->action != NULL )
+        return -EBUSY;
+
+    desc->action  = new;
+    dsb(sy);
+
+    return 0;
+}
+
+int setup_dt_irq(const struct dt_irq *irq, struct irqaction *new)
+{
+    int rc;
+    unsigned long flags;
+    struct irq_desc *desc;
+
+    desc = irq_to_desc(irq->irq);
+
+    spin_lock_irqsave(&desc->lock, flags);
+    rc = __setup_irq(desc, new);
+    spin_unlock_irqrestore(&desc->lock, flags);
+
+    if ( !rc )
+        desc->handler->startup(desc);
+
+    return rc;
+}
+
+int route_dt_irq_to_guest(struct domain *d, const struct dt_irq *irq,
+                          const char * devname)
+{
+    struct irqaction *action;
+    struct irq_desc *desc = irq_to_desc(irq->irq);
+    unsigned long flags;
+    int retval;
+    bool_t level;
+
+    action = xmalloc(struct irqaction);
+    if (!action)
+        return -ENOMEM;
+
+    action->dev_id = d;
+    action->name = devname;
+    action->free_on_release = 1;
+
+    spin_lock_irqsave(&desc->lock, flags);
+
+    retval = __setup_irq(desc, action);
+    if ( retval )
+    {
+        xfree(action);
+        goto out;
+    }
+
+    level = dt_irq_is_level_triggered(irq);
+    gic_route_irq_to_guest(d, desc, level, cpumask_of(smp_processor_id()),
+                           GIC_PRI_IRQ);
+
+out:
+    spin_unlock_irqrestore(&desc->lock, flags);
+    return retval;
+}
+
 /*
  * pirq event channels. We don't use these on ARM, instead we use the
  * features of the GIC to inject virtualised normal interrupts.
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 071280b..0e6e325 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -153,6 +153,7 @@
 
 #ifndef __ASSEMBLY__
 #include <xen/device_tree.h>
+#include <xen/irq.h>
 
 #define DT_MATCH_GIC    DT_MATCH_COMPATIBLE("arm,cortex-a15-gic"), \
                         DT_MATCH_COMPATIBLE("arm,cortex-a7-gic")
@@ -170,6 +171,9 @@ extern struct pending_irq *irq_to_pending(struct vcpu *v, unsigned int irq);
 extern void gic_route_dt_irq(const struct dt_irq *irq,
                              const cpumask_t *cpu_mask,
                              unsigned int priority);
+extern void gic_route_irq_to_guest(struct domain *, struct irq_desc *desc,
+                                   bool_t level, const cpumask_t *cpu_mask,
+                                   unsigned int priority);
 extern void gic_route_ppis(void);
 extern void gic_route_spis(void);
 
@@ -181,9 +185,6 @@ extern void __cpuinit init_maintenance_interrupt(void);
 extern void gic_set_guest_irq(struct vcpu *v, unsigned int irq,
         unsigned int state, unsigned int priority);
 extern void gic_remove_from_queues(struct vcpu *v, unsigned int virtual_irq);
-extern int gic_route_irq_to_guest(struct domain *d,
-                                  const struct dt_irq *irq,
-                                  const char * devname);
 
 /* Accept an interrupt from the GIC and dispatch its handler */
 extern void gic_interrupt(struct cpu_user_regs *regs, int is_fiq);
diff --git a/xen/include/asm-arm/irq.h b/xen/include/asm-arm/irq.h
index 9380987..b52c26f 100644
--- a/xen/include/asm-arm/irq.h
+++ b/xen/include/asm-arm/irq.h
@@ -44,6 +44,9 @@ int request_dt_irq(const struct dt_irq *irq,
                    const char *devname, void *dev_id);
 int setup_dt_irq(const struct dt_irq *irq, struct irqaction *new);
 
+int route_dt_irq_to_guest(struct domain *d, const struct dt_irq *irq,
+                          const char *devname);
+
 #endif /* _ASM_HW_IRQ_H */
 /*
  * Local variables:
-- 
1.7.10.4