arm/acpi: Parse FADT table and get PSCI flags

There are two flags: PSCI_COMPLIANT and PSCI_USE_HVC. When set, the
former signals to the OS that the hardware is PSCI compliant. The latter
selects the appropriate conduit for PSCI calls by toggling between
Hypervisor Calls (HVC) and Secure Monitor Calls (SMC). FADT table
contains such information, parse FADT to get the flags for furture
usage.

Since STAO table and the GIC version are introduced by ACPI 6.0, we will
check the version and only parse FADT table with version >= 6.0. If
firmware provides ACPI tables with ACPI version less than 6.0, OS will
be messed up with those information, so disable ACPI if we get an FADT
table with version less than 6.0.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Naresh Bhat <naresh.bhat@linaro.org>
Signed-off-by: Parth Dixit <parth.dixit@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
index 1570f7e23aec69a3c12ae21b447a36c91775bc59..6b33fbe20cc6e723dc8337d40541416ff45b27fe 100644 (file)
--- a/xen/arch/arm/acpi/boot.c
+++ b/xen/arch/arm/acpi/boot.c
@@ -27,9 +27,32 @@
 
 #include <xen/init.h>
 #include <xen/acpi.h>
+#include <xen/errno.h>
+#include <acpi/actables.h>
+#include <xen/mm.h>
 
 #include <asm/acpi.h>
 
+static int __init acpi_parse_fadt(struct acpi_table_header *table)
+{
+    struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
+
+    /*
+     * Revision in table header is the FADT Major revision, and there
+     * is a minor revision of FADT which was introduced by ACPI 6.0,
+     * we only deal with ACPI 6.0 or newer revision to get GIC and SMP
+     * boot protocol configuration data, or we will disable ACPI.
+     */
+    if ( table->revision > 6
+         || (table->revision == 6 && fadt->minor_revision >= 0) )
+        return 0;
+
+    printk("Unsupported FADT revision %d.%d, should be 6.0+, will disable ACPI\n",
+            table->revision, fadt->minor_revision);
+
+    return -EINVAL;
+}
+
 /*
  * acpi_boot_table_init() called from setup_arch(), always.
  *      1. find RSDP and get its address, and then find XSDT
@@ -54,5 +77,12 @@ int __init acpi_boot_table_init(void)
         return error;
     }
 
+    if ( acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt) )
+    {
+        /* disable ACPI if no FADT is found */
+        disable_acpi();
+        printk("Can't find FADT\n");
+    }
+
     return 0;
 }

diff --git a/xen/arch/arm/acpi/lib.c b/xen/arch/arm/acpi/lib.c
index 7996e9a14e655765ed78dfb25f691ea3786412b2..db5c4d84fe5cc2402b15ac2607bde02544c895c0 100644 (file)
--- a/xen/arch/arm/acpi/lib.c
+++ b/xen/arch/arm/acpi/lib.c
@@ -48,3 +48,15 @@ char *__acpi_map_table(paddr_t phys, unsigned long size)
 
     return ((char *) base + offset);
 }
+
+/* 1 to indicate PSCI 0.2+ is implemented */
+bool_t __init acpi_psci_present(void)
+{
+    return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
+}
+
+/* 1 to indicate HVC is present instead of SMC as the PSCI conduit */
+bool_t __init acpi_psci_hvc_present(void)
+{
+    return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
+}

diff --git a/xen/include/asm-arm/acpi.h b/xen/include/asm-arm/acpi.h
index 9849edf290f95e17ad3551ef90fff27e76df72f0..48d8556912867098f0e1ffd4077917e9c31dba21 100644 (file)
--- a/xen/include/asm-arm/acpi.h
+++ b/xen/include/asm-arm/acpi.h
@@ -42,6 +42,9 @@ typedef enum {
     TBL_MMAX,
 } EFI_MEM_RES;
 
+bool_t __init acpi_psci_present(void);
+bool_t __init acpi_psci_hvc_present(void);
+
 #ifdef CONFIG_ACPI
 extern bool_t acpi_disabled;
 /* Basic configuration for ACPI */