[Xen-devel] [PATCH v5 09/22] arm/acpi: Add ACPI support for SMP initialization

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

ACPI 5.1 only has two explicit methods to boot up SMP, PSCI and Parking
protocol, but the Parking protocol is only specified for ARMv7 now, so
make PSCI as the only way for the SMP boot protocol before some updates
for the ACPI spec or the Parking protocol spec.

ACPI only supports PSCI 0.2+, since prior to PSCI 0.2 function IDs are
not well-defined.

Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
V4: explain why only support PSCI 0.2+ and print an error message for
    PSCI 0.1 and SMC not present
---
 xen/arch/arm/arm64/smpboot.c |  7 ++++++-
 xen/arch/arm/psci.c          | 35 ++++++++++++++++++++++++++++-------
 xen/arch/arm/smpboot.c       |  7 ++++++-
 3 files changed, 40 insertions(+), 9 deletions(-)

diff --git a/xen/arch/arm/arm64/smpboot.c b/xen/arch/arm/arm64/smpboot.c
index 7928f69..4fd0ac6 100644
--- a/xen/arch/arm/arm64/smpboot.c
+++ b/xen/arch/arm/arm64/smpboot.c
@@ -7,6 +7,7 @@
 #include <xen/vmap.h>
 #include <asm/io.h>
 #include <asm/psci.h>
+#include <asm/acpi.h>
 
 struct smp_enable_ops {
         int             (*prepare_cpu)(int);
@@ -96,7 +97,11 @@ static int __init dt_arch_cpu_init(int cpu, struct 
dt_device_node *dn)
 
 int __init arch_cpu_init(int cpu, struct dt_device_node *dn)
 {
-    return dt_arch_cpu_init(cpu, dn);
+    if ( acpi_disabled )
+        return dt_arch_cpu_init(cpu, dn);
+    else
+        /* acpi only supports psci at present */
+        return smp_psci_init(cpu);
 }
 
 int __init arch_cpu_up(int cpu)
diff --git a/xen/arch/arm/psci.c b/xen/arch/arm/psci.c
index d800cb6..7966b5e 100644
--- a/xen/arch/arm/psci.c
+++ b/xen/arch/arm/psci.c
@@ -22,6 +22,7 @@
 #include <xen/mm.h>
 #include <xen/smp.h>
 #include <asm/psci.h>
+#include <asm/acpi.h>
 
 /*
  * While a 64-bit OS can make calls with SMC32 calling conventions, for
@@ -86,6 +87,12 @@ int __init psci_init_0_1(void)
     int ret;
     const struct dt_device_node *psci;
 
+    if ( !acpi_disabled )
+    {
+        printk("PSCI 0.1 is not supported when using ACPI\n");
+        return -EINVAL;
+    }
+
     psci = dt_find_compatible_node(NULL, NULL, "arm,psci");
     if ( !psci )
         return -EOPNOTSUPP;
@@ -116,15 +123,26 @@ int __init psci_init_0_2(void)
         { /* sentinel */ },
     };
     int ret;
-    const struct dt_device_node *psci;
 
-    psci = dt_find_matching_node(NULL, psci_ids);
-    if ( !psci )
-        return -EOPNOTSUPP;
+    if ( acpi_disabled )
+    {
+        const struct dt_device_node *psci;
 
-    ret = psci_is_smc_method(psci);
-    if ( ret )
-        return -EINVAL;
+        psci = dt_find_matching_node(NULL, psci_ids);
+        if ( !psci )
+            return -EOPNOTSUPP;
+
+        ret = psci_is_smc_method(psci);
+        if ( ret )
+            return -EINVAL;
+    }
+    else
+    {
+        if ( acpi_psci_hvc_present() ) {
+            printk("PSCI conduit must be SMC, but is HVC\n");
+            return -EINVAL;
+        }
+    }
 
     psci_ver = call_smc(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
 
@@ -148,6 +166,9 @@ int __init psci_init(void)
 {
     int ret;
 
+    if ( !acpi_disabled && !acpi_psci_present() )
+        return -EOPNOTSUPP;
+
     ret = psci_init_0_2();
     if ( ret )
         ret = psci_init_0_1();
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index b6119d1..c5109bf 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -31,6 +31,7 @@
 #include <xen/console.h>
 #include <asm/gic.h>
 #include <asm/psci.h>
+#include <asm/acpi.h>
 
 cpumask_t cpu_online_map;
 cpumask_t cpu_present_map;
@@ -247,7 +248,11 @@ void __init smp_init_cpus(void)
         return;
     }
 
-    dt_smp_init_cpus();
+    if ( acpi_disabled )
+        dt_smp_init_cpus();
+    else
+        acpi_smp_init_cpus();
+
 }
 
 int __init
-- 
2.0.4



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