[Xen-devel] [PATCH 04/17] ARM: vGICv3: remove rdist_stride from VGIC structure

[Andre Przywara <andre.przywara@xxxxxxxxxx>]

The last patch removed the usage of the hardware's redistributor-stride
value from our (Dom0) GICv3 emulation. This means we no longer need to
store this value in the VGIC data structure.
Remove that variable and every code snippet that handled that, instead
simply always use the architected value.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/gic-v3.c         |  3 +--
 xen/arch/arm/vgic-v3.c        | 14 --------------
 xen/include/asm-arm/domain.h  |  1 -
 xen/include/asm-arm/vgic.h    |  1 -
 xen/include/public/arch-arm.h |  1 -
 5 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index 047af691b1..4acdd0ad91 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1680,8 +1680,7 @@ static int __init gicv3_init(void)
     reg = readl_relaxed(GICD + GICD_TYPER);
     intid_bits = GICD_TYPE_ID_BITS(reg);
 
-    vgic_v3_setup_hw(dbase, gicv3.rdist_count, gicv3.rdist_regions,
-                     gicv3.rdist_stride, intid_bits);
+    vgic_v3_setup_hw(dbase, gicv3.rdist_count, gicv3.rdist_regions, 
intid_bits);
     gicv3_init_v2();
 
     spin_lock_init(&gicv3.lock);
diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index 56cc38ffcc..4b42739a52 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -58,21 +58,18 @@ static struct {
     /* Re-distributor regions */
     unsigned int nr_rdist_regions;
     const struct rdist_region *regions;
-    uint32_t rdist_stride; /* Re-distributor stride */
     unsigned int intid_bits;  /* Number of interrupt ID bits */
 } vgic_v3_hw;
 
 void vgic_v3_setup_hw(paddr_t dbase,
                       unsigned int nr_rdist_regions,
                       const struct rdist_region *regions,
-                      uint32_t rdist_stride,
                       unsigned int intid_bits)
 {
     vgic_v3_hw.enabled = true;
     vgic_v3_hw.dbase = dbase;
     vgic_v3_hw.nr_rdist_regions = nr_rdist_regions;
     vgic_v3_hw.regions = regions;
-    vgic_v3_hw.rdist_stride = rdist_stride;
     vgic_v3_hw.intid_bits = intid_bits;
 }
 
@@ -1672,15 +1669,6 @@ static int vgic_v3_domain_init(struct domain *d)
 
         d->arch.vgic.dbase = vgic_v3_hw.dbase;
 
-        d->arch.vgic.rdist_stride = vgic_v3_hw.rdist_stride;
-        /*
-         * If the stride is not set, the default stride for GICv3 is 2 * 64K:
-         *     - first 64k page for Control and Physical LPIs
-         *     - second 64k page for Control and Generation of SGIs
-         */
-        if ( !d->arch.vgic.rdist_stride )
-            d->arch.vgic.rdist_stride = 2 * SZ_64K;
-
         for ( i = 0; i < vgic_v3_hw.nr_rdist_regions; i++ )
         {
             paddr_t size = vgic_v3_hw.regions[i].size;
@@ -1703,8 +1691,6 @@ static int vgic_v3_domain_init(struct domain *d)
         /* A single Re-distributor region is mapped for the guest. */
         BUILD_BUG_ON(GUEST_GICV3_RDIST_REGIONS != 1);
 
-        d->arch.vgic.rdist_stride = GUEST_GICV3_RDIST_STRIDE;
-
         /* The first redistributor should contain enough space for all CPUs */
         BUILD_BUG_ON((GUEST_GICV3_GICR0_SIZE / GICV3_GICR_SIZE) < 
MAX_VIRT_CPUS);
         d->arch.vgic.rdist_regions[0].base = GUEST_GICV3_GICR0_BASE;
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index 0dd8c954e2..aee247a037 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -105,7 +105,6 @@ struct arch_domain
             unsigned int first_cpu;         /* First CPU handled */
         } *rdist_regions;
         int nr_regions;                     /* Number of rdist regions */
-        uint32_t rdist_stride;              /* Re-Distributor stride */
         unsigned long int nr_lpis;
         uint64_t rdist_propbase;
         struct rb_root its_devices;         /* Devices mapped to an ITS */
diff --git a/xen/include/asm-arm/vgic.h b/xen/include/asm-arm/vgic.h
index 6ea9f140a7..d61b54867b 100644
--- a/xen/include/asm-arm/vgic.h
+++ b/xen/include/asm-arm/vgic.h
@@ -261,7 +261,6 @@ struct rdist_region;
 void vgic_v3_setup_hw(paddr_t dbase,
                       unsigned int nr_rdist_regions,
                       const struct rdist_region *regions,
-                      uint32_t rdist_stride,
                       unsigned int intid_bits);
 #endif
 
diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index 05fd11ca38..eb424e8286 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -401,7 +401,6 @@ typedef uint64_t xen_callback_t;
 #define GUEST_GICV3_GICD_BASE      xen_mk_ullong(0x03001000)
 #define GUEST_GICV3_GICD_SIZE      xen_mk_ullong(0x00010000)
 
-#define GUEST_GICV3_RDIST_STRIDE   xen_mk_ullong(0x00020000)
 #define GUEST_GICV3_RDIST_REGIONS  1
 
 #define GUEST_GICV3_GICR0_BASE     xen_mk_ullong(0x03020000) /* vCPU0..127 */
-- 
2.14.1


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