[Xen-devel] [RFC 13/29] xen/arm: Use hierarchical device tree to retrieve GIC information

[Julien Grall <julien.grall@xxxxxxxxxx>]

- Remove early parsing for GIC addresses
- Remove hard coded maintenance IRQ number

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/gic.c            |   63 ++++++++++++++++++++++++++++-------------
 xen/common/device_tree.c      |   42 ---------------------------
 xen/include/xen/device_tree.h |    8 ------
 3 files changed, 43 insertions(+), 70 deletions(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 1f44fea..9c8049e 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -45,6 +45,7 @@ static struct {
     paddr_t hbase;       /* Address of virtual interface registers */
     paddr_t vbase;       /* Address of virtual cpu interface registers */
     unsigned int lines;
+    struct dt_irq maintenance; /* IRQ maintenance */
     unsigned int cpus;
     spinlock_t lock;
 } gic;
@@ -352,28 +353,49 @@ int gic_irq_xlate(const u32 *intspec, unsigned int 
intsize,
 /* Set up the GIC */
 void __init gic_init(void)
 {
+    struct dt_device_node *node;
+    int res;
+
+    node = dt_find_interrupt_controller("arm,cortex-a15-gic");
+    if ( !node )
+        panic("Unable to find compatible GIC in the device tree\n");
+
+    dt_device_set_used_by(node, DT_USED_BY_XEN);
+
+    res = dt_device_get_address(node, 0, &gic.dbase, NULL);
+    if ( res || !gic.dbase || (gic.dbase & ~PAGE_MASK) )
+        panic("GIC: Cannot find a valid address for the distributor\n");
+
+    res = dt_device_get_address(node, 1, &gic.cbase, NULL);
+    if ( res || !gic.cbase || (gic.cbase & ~PAGE_MASK) )
+        panic("GIC: Cannot find a valid address for the CPU\n");
+
+    res = dt_device_get_address(node, 2, &gic.hbase, NULL);
+    if ( res || !gic.hbase || (gic.hbase & ~PAGE_MASK) )
+        panic("GIC: Cannot find a valid address for the hypervisor\n");
+
+    res = dt_device_get_address(node, 3, &gic.vbase, NULL);
+    if ( res || !gic.vbase || (gic.vbase & ~PAGE_MASK) )
+        panic("GIC: Cannot find a valid address for the virtual CPU\n");
+
+    res = dt_device_get_irq(node, 0, &gic.maintenance);
+    if ( res )
+        panic("GIC: Cannot find the maintenance IRQ\n");
+
+    /* Set the GIC as the primary interrupt controller */
+    dt_interrupt_controller = node;
+
+    /* TODO: Add check on distributor, cpu size */
+
     printk("GIC initialization:\n"
               "        gic_dist_addr=%"PRIpaddr"\n"
               "        gic_cpu_addr=%"PRIpaddr"\n"
               "        gic_hyp_addr=%"PRIpaddr"\n"
-              "        gic_vcpu_addr=%"PRIpaddr"\n",
-              early_info.gic.gic_dist_addr, early_info.gic.gic_cpu_addr,
-              early_info.gic.gic_hyp_addr, early_info.gic.gic_vcpu_addr);
-    if ( !early_info.gic.gic_dist_addr ||
-         !early_info.gic.gic_cpu_addr ||
-         !early_info.gic.gic_hyp_addr ||
-         !early_info.gic.gic_vcpu_addr )
-        panic("the physical address of one of the GIC interfaces is 
missing\n");
-    if ( (early_info.gic.gic_dist_addr & ~PAGE_MASK) ||
-         (early_info.gic.gic_cpu_addr & ~PAGE_MASK) ||
-         (early_info.gic.gic_hyp_addr & ~PAGE_MASK) ||
-         (early_info.gic.gic_vcpu_addr & ~PAGE_MASK) )
-        panic("GIC interfaces not page aligned.\n");
-
-    gic.dbase = early_info.gic.gic_dist_addr;
-    gic.cbase = early_info.gic.gic_cpu_addr;
-    gic.hbase = early_info.gic.gic_hyp_addr;
-    gic.vbase = early_info.gic.gic_vcpu_addr;
+              "        gic_vcpu_addr=%"PRIpaddr"\n"
+              "        gic_maintenance_irq=%u\n",
+              gic.dbase, gic.cbase, gic.hbase, gic.vbase,
+              gic.maintenance.irq);
+
     set_fixmap(FIXMAP_GICD, gic.dbase >> PAGE_SHIFT, DEV_SHARED);
     BUILD_BUG_ON(FIXMAP_ADDR(FIXMAP_GICC1) !=
                  FIXMAP_ADDR(FIXMAP_GICC2)-PAGE_SIZE);
@@ -464,7 +486,7 @@ void gic_route_ppis(void)
 {
     /* XXX should get these from DT */
     /* GIC maintenance */
-    gic_route_irq(25, 1, 1u << smp_processor_id(), 0xa0);
+    gic_route_dt_irq(&gic.maintenance, 1u << smp_processor_id(), 0xa0);
     /* Hypervisor Timer */
     gic_route_irq(26, 1, 1u << smp_processor_id(), 0xa0);
     /* Virtual Timer */
@@ -813,7 +835,8 @@ void gic_dump_info(struct vcpu *v)
 
 void __cpuinit init_maintenance_interrupt(void)
 {
-    request_irq(25, maintenance_interrupt, 0, "irq-maintenance", NULL);
+    request_irq(gic.maintenance.irq, maintenance_interrupt,
+                0, "irq-maintenance", NULL);
 }
 
 /*
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index c623fe2..284b574 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -422,46 +422,6 @@ static void __init process_cpu_node(const void *fdt, int 
node,
     cpumask_set_cpu(start, &cpu_possible_map);
 }
 
-static void __init process_gic_node(const void *fdt, int node,
-                                    const char *name,
-                                    u32 address_cells, u32 size_cells)
-{
-    const struct fdt_property *prop;
-    const u32 *cell;
-    paddr_t start, size;
-    int interfaces;
-
-    if ( address_cells < 1 || size_cells < 1 )
-    {
-        early_printk("fdt: node `%s': invalid #address-cells or #size-cells",
-                     name);
-        return;
-    }
-
-    prop = fdt_get_property(fdt, node, "reg", NULL);
-    if ( !prop )
-    {
-        early_printk("fdt: node `%s': missing `reg' property\n", name);
-        return;
-    }
-
-    cell = (const u32 *)prop->data;
-    interfaces = device_tree_nr_reg_ranges(prop, address_cells, size_cells);
-    if ( interfaces < 4 )
-    {
-        early_printk("fdt: node `%s': not enough ranges\n", name);
-        return;
-    }
-    device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
-    early_info.gic.gic_dist_addr = start;
-    device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
-    early_info.gic.gic_cpu_addr = start;
-    device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
-    early_info.gic.gic_hyp_addr = start;
-    device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
-    early_info.gic.gic_vcpu_addr = start;
-}
-
 static void __init process_multiboot_node(const void *fdt, int node,
                                           const char *name,
                                           u32 address_cells, u32 size_cells)
@@ -513,8 +473,6 @@ static int __init early_scan_node(const void *fdt,
         process_memory_node(fdt, node, name, address_cells, size_cells);
     else if ( device_tree_type_matches(fdt, node, "cpu") )
         process_cpu_node(fdt, node, name, address_cells, size_cells);
-    else if ( device_tree_node_compatible(fdt, node, "arm,cortex-a15-gic") )
-        process_gic_node(fdt, node, name, address_cells, size_cells);
     else if ( device_tree_node_compatible(fdt, node, "xen,multiboot-module" ) )
         process_multiboot_node(fdt, node, name, address_cells, size_cells);
 
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index c897eab..a3502e0 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -31,13 +31,6 @@ struct dt_mem_info {
     struct membank bank[NR_MEM_BANKS];
 };
 
-struct dt_gic_info {
-    paddr_t gic_dist_addr;
-    paddr_t gic_cpu_addr;
-    paddr_t gic_hyp_addr;
-    paddr_t gic_vcpu_addr;
-};
-
 struct dt_mb_module {
     paddr_t start;
     paddr_t size;
@@ -52,7 +45,6 @@ struct dt_module_info {
 
 struct dt_early_info {
     struct dt_mem_info mem;
-    struct dt_gic_info gic;
     struct dt_module_info modules;
 };
 
-- 
Julien Grall


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