[Xen-devel] [PATCH 2/8] arm/gic-v3: Fold GICR subtable parsing into a new function

[Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>]

Add a new function for parsing GICR subtable and move the code
that is specific to GICR table to new function without changing
the function gicv3_acpi_init() behavior.

Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
---
 xen/arch/arm/gic-v3.c | 64 +++++++++++++++++++++++++++++++++------------------
 1 file changed, 42 insertions(+), 22 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index ab1f380..af12ebc 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1387,6 +1387,36 @@ gic_acpi_parse_madt_distributor(struct 
acpi_subtable_header *header,
 
     return 0;
 }
+
+static int __init
+gic_acpi_parse_madt_redistributor(struct acpi_subtable_header *header,
+                                  const unsigned long end)
+{
+    struct acpi_madt_generic_redistributor *rdist;
+    struct rdist_region *region;
+
+    region = gicv3.rdist_regions + gicv3.rdist_count;
+    rdist = (struct acpi_madt_generic_redistributor *)header;
+    if ( BAD_MADT_ENTRY(rdist, end) )
+        return -EINVAL;
+
+    if ( !rdist->base_address || !rdist->length )
+        return -EINVAL;
+
+    region->base = rdist->base_address;
+    region->size = rdist->length;
+
+    region->map_base = ioremap_nocache(region->base, region->size);
+    if ( !region->map_base )
+    {
+        printk("Unable to map GICR registers\n");
+        return -ENOMEM;
+    }
+    gicv3.rdist_count++;
+
+    return 0;
+}
+
 static int __init
 gic_acpi_get_madt_redistributor_num(struct acpi_subtable_header *header,
                                     const unsigned long end)
@@ -1402,7 +1432,7 @@ static void __init gicv3_acpi_init(void)
     struct acpi_table_header *table;
     struct rdist_region *rdist_regs;
     acpi_status status;
-    int count, i;
+    int count;
 
     status = acpi_get_table(ACPI_SIG_MADT, 0, &table);
 
@@ -1433,37 +1463,27 @@ static void __init gicv3_acpi_init(void)
     if ( count <= 0 )
         panic("GICv3: No valid GICR entries exists");
 
-    gicv3.rdist_count = count;
-
-    if ( gicv3.rdist_count > MAX_RDIST_COUNT )
+    if ( count > MAX_RDIST_COUNT )
         panic("GICv3: Number of redistributor regions is more than"
               "%d (Increase MAX_RDIST_COUNT!!)\n", MAX_RDIST_COUNT);
 
-    rdist_regs = xzalloc_array(struct rdist_region, gicv3.rdist_count);
+    rdist_regs = xzalloc_array(struct rdist_region, count);
     if ( !rdist_regs )
         panic("GICv3: Failed to allocate memory for rdist regions\n");
 
-    for ( i = 0; i < gicv3.rdist_count; i++ )
-    {
-        struct acpi_subtable_header *header;
-        struct acpi_madt_generic_redistributor *gic_rdist;
-
-        header = 
acpi_table_get_entry_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
-                                           i);
-        if ( !header )
-            panic("GICv3: Can't get GICR entry");
-
-        gic_rdist =
-           container_of(header, struct acpi_madt_generic_redistributor, 
header);
-        rdist_regs[i].base = gic_rdist->base_address;
-        rdist_regs[i].size = gic_rdist->length;
-    }
+    gicv3.rdist_regions = rdist_regs;
+
+    /* Parse always-on power domain Re-distributor entries */
+    count = acpi_parse_entries(ACPI_SIG_MADT,
+                               sizeof(struct acpi_table_madt),
+                               gic_acpi_parse_madt_redistributor, table,
+                               ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, count);
+    if ( count <= 0 )
+        panic("GICv3: Can't get Redistributor entry");
 
     /* The vGIC code requires the region to be sorted */
     sort(rdist_regs, gicv3.rdist_count, sizeof(*rdist_regs), cmp_rdist, NULL);
 
-    gicv3.rdist_regions= rdist_regs;
-
     /* Collect CPU base addresses */
     count = acpi_parse_entries(ACPI_SIG_MADT, sizeof(struct acpi_table_madt),
                                gic_acpi_parse_madt_cpu, table,
-- 
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, 
a Linux Foundation Collaborative Project


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