[RFC 3/8] xen/arm: gic: split set_irq_properties

[Julien Grall <julien.grall@arm.com>]

The callback set_irq_properties will configure the GIC for a specific
IRQ with the type and the priority.

In a follow-up patch, Xen will configure the type and the priority at
different stage of the routing. So split it in 2 separate callbacks.

At the same time, move the ASSERT to check the validity of the type and
if the desc->lock is locked in the common code (gic.c). This is because
the constraint are the same between GICv2 and GICv3, however the driver
of the latter did not contain any sanity check.

Signed-off-by: Julien Grall <julien.grall@arm.com>
---
 xen/arch/arm/gic-v2.c     | 19 +++++++++++++------
 xen/arch/arm/gic-v3.c     | 15 ++++++++++++---
 xen/arch/arm/gic.c        | 23 ++++++++++++++---------
 xen/include/asm-arm/gic.h |  7 ++++---
 4 files changed, 43 insertions(+), 21 deletions(-)

diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
index 90b07b3..fa2c5a5 100644
--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -200,16 +200,12 @@ static unsigned int gicv2_read_irq(void)
     return (readl_gicc(GICC_IAR) & GICC_IA_IRQ);
 }
 
-static void gicv2_set_irq_properties(struct irq_desc *desc,
-                                     unsigned int priority)
+static void gicv2_set_irq_type(struct irq_desc *desc)
 {
     uint32_t cfg, actual, edgebit;
     unsigned int irq = desc->irq;
     unsigned int type = desc->arch.type;
 
-    ASSERT(type != IRQ_TYPE_INVALID);
-    ASSERT(spin_is_locked(&desc->lock));
-
     spin_lock(&gicv2.lock);
     /* Set edge / level */
     cfg = readl_gicd(GICD_ICFGR + (irq / 16) * 4);
@@ -234,6 +230,16 @@ static void gicv2_set_irq_properties(struct irq_desc *desc,
             IRQ_TYPE_LEVEL_HIGH;
     }
 
+    spin_unlock(&gicv2.lock);
+}
+
+static void gicv2_set_irq_priority(struct irq_desc *desc,
+                                   unsigned int priority)
+{
+    unsigned int irq = desc->irq;
+
+    spin_lock(&gicv2.lock);
+
     /* Set priority */
     writeb_gicd(priority, GICD_IPRIORITYR + irq);
 
@@ -916,7 +922,8 @@ const static struct gic_hw_operations gicv2_ops = {
     .eoi_irq             = gicv2_eoi_irq,
     .deactivate_irq      = gicv2_dir_irq,
     .read_irq            = gicv2_read_irq,
-    .set_irq_properties  = gicv2_set_irq_properties,
+    .set_irq_type        = gicv2_set_irq_type,
+    .set_irq_priority    = gicv2_set_irq_priority,
     .send_SGI            = gicv2_send_SGI,
     .disable_interface   = gicv2_disable_interface,
     .update_lr           = gicv2_update_lr,
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index c936c8a..c25fe50 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -471,8 +471,7 @@ static inline uint64_t gicv3_mpidr_to_affinity(int cpu)
              MPIDR_AFFINITY_LEVEL(mpidr, 0));
 }
 
-static void gicv3_set_irq_properties(struct irq_desc *desc,
-                                     unsigned int priority)
+static void gicv3_set_irq_type(struct irq_desc *desc)
 {
     uint32_t cfg, actual, edgebit;
     void __iomem *base;
@@ -512,6 +511,15 @@ static void gicv3_set_irq_properties(struct irq_desc *desc,
             IRQ_TYPE_EDGE_RISING :
             IRQ_TYPE_LEVEL_HIGH;
     }
+    spin_unlock(&gicv3.lock);
+}
+
+static void gicv3_set_irq_priority(struct irq_desc *desc,
+                                   unsigned int priority)
+{
+    unsigned int irq = desc->irq;
+
+    spin_lock(&gicv3.lock);
 
     /* Set priority */
     if ( irq < NR_GIC_LOCAL_IRQS )
@@ -1547,7 +1555,8 @@ static const struct gic_hw_operations gicv3_ops = {
     .eoi_irq             = gicv3_eoi_irq,
     .deactivate_irq      = gicv3_dir_irq,
     .read_irq            = gicv3_read_irq,
-    .set_irq_properties  = gicv3_set_irq_properties,
+    .set_irq_type        = gicv3_set_irq_type,
+    .set_irq_priority    = gicv3_set_irq_priority,
     .send_SGI            = gicv3_send_sgi,
     .disable_interface   = gicv3_disable_interface,
     .update_lr           = gicv3_update_lr,
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index f25381f..0fd7e8c 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -96,14 +96,17 @@ void gic_restore_state(struct vcpu *v)
     gic_restore_pending_irqs(v);
 }
 
-/*
- * - desc.lock must be held
- * - arch.type must be valid (i.e != IRQ_TYPE_INVALID)
- */
-static void gic_set_irq_properties(struct irq_desc *desc,
-                                   unsigned int priority)
+static void gic_set_irq_type(struct irq_desc *desc)
+{
+    ASSERT(spin_is_locked(&desc->lock));
+    ASSERT(desc->arch.type != IRQ_TYPE_INVALID);
+
+    gic_hw_ops->set_irq_type(desc);
+}
+
+static void gic_set_irq_priority(struct irq_desc *desc, unsigned int priority)
 {
-    gic_hw_ops->set_irq_properties(desc, priority);
+    gic_hw_ops->set_irq_priority(desc, priority);
 }
 
 /* Program the GIC to route an interrupt to the host (i.e. Xen)
@@ -121,7 +124,8 @@ void gic_route_irq_to_xen(struct irq_desc *desc, const cpumask_t *cpu_mask,
 
     desc->handler->set_affinity(desc, cpu_mask);
 
-    gic_set_irq_properties(desc, priority);
+    gic_set_irq_type(desc);
+    gic_set_irq_priority(desc, priority);
 }
 
 /* Program the GIC to route an interrupt to a guest
@@ -153,7 +157,8 @@ int gic_route_irq_to_guest(struct domain *d, unsigned int virq,
     desc->handler = gic_hw_ops->gic_guest_irq_type;
     set_bit(_IRQ_GUEST, &desc->status);
 
-    gic_set_irq_properties(desc, priority);
+    gic_set_irq_type(desc);
+    gic_set_irq_priority(desc, priority);
 
     p->desc = desc;
     res = 0;
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index b931f98..ffba469 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -329,9 +329,10 @@ struct gic_hw_operations {
     void (*deactivate_irq)(struct irq_desc *irqd);
     /* Read IRQ id and Ack */
     unsigned int (*read_irq)(void);
-    /* Set IRQ property */
-    void (*set_irq_properties)(struct irq_desc *desc,
-                               unsigned int priority);
+    /* Set IRQ type - type is taken from desc->arch.type */
+    void (*set_irq_type)(struct irq_desc *desc);
+    /* Set IRQ priority */
+    void (*set_irq_priority)(struct irq_desc *desc, unsigned int priority);
     /* Send SGI */
     void (*send_SGI)(enum gic_sgi sgi, enum gic_sgi_mode irqmode,
                      const cpumask_t *online_mask);
-- 
1.9.1


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