[Xen-devel] [PATCH v4 7/8] ARM: VGIC: rework gicv[23]_update_lr to not use pending_irq

[Andre Przywara <andre.przywara@xxxxxxx>]

The functions to actually populate a list register were accessing
the VGIC internal pending_irq struct, although they should be abstracting
from that.
Break the needed information down to remove the reference to pending_irq
from gic-v[23].c.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/gic-v2.c     | 14 +++++++-------
 xen/arch/arm/gic-v3.c     | 12 ++++++------
 xen/arch/arm/gic-vgic.c   |  3 ++-
 xen/include/asm-arm/gic.h |  4 ++--
 xen/include/asm-arm/irq.h |  3 +++
 5 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
index 511c8d7294..2b271ba322 100644
--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -428,8 +428,8 @@ static void gicv2_disable_interface(void)
     spin_unlock(&gicv2.lock);
 }
 
-static void gicv2_update_lr(int lr, const struct pending_irq *p,
-                            unsigned int state)
+static void gicv2_update_lr(int lr, unsigned int virq, uint8_t priority,
+                            unsigned int hw_irq, unsigned int state)
 {
     uint32_t lr_reg;
 
@@ -437,12 +437,12 @@ static void gicv2_update_lr(int lr, const struct 
pending_irq *p,
     BUG_ON(lr < 0);
 
     lr_reg = (((state & GICH_V2_LR_STATE_MASK) << GICH_V2_LR_STATE_SHIFT)  |
-              ((GIC_PRI_TO_GUEST(p->priority) & GICH_V2_LR_PRIORITY_MASK)
-                                             << GICH_V2_LR_PRIORITY_SHIFT) |
-              ((p->irq & GICH_V2_LR_VIRTUAL_MASK) << 
GICH_V2_LR_VIRTUAL_SHIFT));
+              ((GIC_PRI_TO_GUEST(priority) & GICH_V2_LR_PRIORITY_MASK)
+                                          << GICH_V2_LR_PRIORITY_SHIFT) |
+              ((virq & GICH_V2_LR_VIRTUAL_MASK) << GICH_V2_LR_VIRTUAL_SHIFT));
 
-    if ( p->desc != NULL )
-        lr_reg |= GICH_V2_LR_HW | ((p->desc->irq & GICH_V2_LR_PHYSICAL_MASK )
+    if ( hw_irq != INVALID_IRQ )
+        lr_reg |= GICH_V2_LR_HW | ((hw_irq & GICH_V2_LR_PHYSICAL_MASK )
                                    << GICH_V2_LR_PHYSICAL_SHIFT);
 
     writel_gich(lr_reg, GICH_LR + lr * 4);
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 072345c6f9..25c30bb9ea 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -966,8 +966,8 @@ static void gicv3_disable_interface(void)
     spin_unlock(&gicv3.lock);
 }
 
-static void gicv3_update_lr(int lr, const struct pending_irq *p,
-                            unsigned int state)
+static void gicv3_update_lr(int lr, unsigned int virq, uint8_t priority,
+                            unsigned int hw_irq, unsigned int state)
 {
     uint64_t val = 0;
 
@@ -983,11 +983,11 @@ static void gicv3_update_lr(int lr, const struct 
pending_irq *p,
     if ( current->domain->arch.vgic.version == GIC_V3 )
         val |= GICH_LR_GRP1;
 
-    val |= ((uint64_t)p->priority & 0xff) << GICH_LR_PRIORITY_SHIFT;
-    val |= ((uint64_t)p->irq & GICH_LR_VIRTUAL_MASK) << GICH_LR_VIRTUAL_SHIFT;
+    val |= (uint64_t)priority << GICH_LR_PRIORITY_SHIFT;
+    val |= ((uint64_t)virq & GICH_LR_VIRTUAL_MASK) << GICH_LR_VIRTUAL_SHIFT;
 
-   if ( p->desc != NULL )
-       val |= GICH_LR_HW | (((uint64_t)p->desc->irq & GICH_LR_PHYSICAL_MASK)
+   if ( hw_irq != INVALID_IRQ )
+       val |= GICH_LR_HW | (((uint64_t)hw_irq & GICH_LR_PHYSICAL_MASK)
                            << GICH_LR_PHYSICAL_SHIFT);
 
     gicv3_ich_write_lr(lr, val);
diff --git a/xen/arch/arm/gic-vgic.c b/xen/arch/arm/gic-vgic.c
index 632c411565..cad30a929e 100644
--- a/xen/arch/arm/gic-vgic.c
+++ b/xen/arch/arm/gic-vgic.c
@@ -38,7 +38,8 @@ static inline void gic_set_lr(int lr, struct pending_irq *p,
 
     clear_bit(GIC_IRQ_GUEST_PRISTINE_LPI, &p->status);
 
-    gic_hw_ops->update_lr(lr, p, state);
+    gic_hw_ops->update_lr(lr, p->irq, p->priority,
+                          p->desc ? p->desc->irq : INVALID_IRQ, state);
 
     set_bit(GIC_IRQ_GUEST_VISIBLE, &p->status);
     clear_bit(GIC_IRQ_GUEST_QUEUED, &p->status);
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 1a142d6e9f..497f195bc1 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -344,8 +344,8 @@ struct gic_hw_operations {
     /* Disable CPU physical and virtual interfaces */
     void (*disable_interface)(void);
     /* Update LR register with state and priority */
-    void (*update_lr)(int lr, const struct pending_irq *pending_irq,
-                      unsigned int state);
+    void (*update_lr)(int lr, unsigned int virq, uint8_t priority,
+                      unsigned int hw_irq, unsigned int state);
     /* Update HCR status register */
     void (*update_hcr_status)(uint32_t flag, bool set);
     /* Clear LR register */
diff --git a/xen/include/asm-arm/irq.h b/xen/include/asm-arm/irq.h
index abc8f06a13..0d110ecb08 100644
--- a/xen/include/asm-arm/irq.h
+++ b/xen/include/asm-arm/irq.h
@@ -31,6 +31,9 @@ struct arch_irq_desc {
 /* LPIs are always numbered starting at 8192, so 0 is a good invalid case. */
 #define INVALID_LPI     0
 
+/* This is a spurious interrupt ID which never makes it into the GIC code. */
+#define INVALID_IRQ     1023
+
 extern unsigned int nr_irqs;
 #define nr_static_irqs NR_IRQS
 #define arch_hwdom_irqs(domid) NR_IRQS
-- 
2.14.1


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