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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 01/17] xen/arm: vpsci: Add support for PSCI 1.1
At the moment, Xen provides virtual PSCI interface compliant with 0.1
and 0.2. Since them, the specification has been updated and the latest
version is 1.1 (see ARM DEN 0022D).
From an implementation point of view, only PSCI_FEATURES is mandatory.
The rest is optional and can be left unimplemented for now.
At the same time, the compatible for PSCI node have been updated to
expose "arm,psci-1.0".
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: mirela.simonovic@xxxxxxxxxx
---
We may want to provide a way for the toolstack to specify a PSCI
version. This could be useful if a guest is expecting a given
version.
Changes in v3:
- Add Wei's acked-by
- Add Volodymyr's reviewed-by
Changes in v2:
- Return v1.1 on GET_VERSION call as claimed by this patch
- Order by function ID the calls in FEATURES call
---
tools/libxl/libxl_arm.c | 3 ++-
xen/arch/arm/domain_build.c | 1 +
xen/arch/arm/vpsci.c | 39 ++++++++++++++++++++++++++++++++++++++-
xen/include/asm-arm/perfc_defn.h | 1 +
xen/include/asm-arm/psci.h | 1 +
xen/include/asm-arm/vpsci.h | 2 +-
6 files changed, 44 insertions(+), 3 deletions(-)
diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
index 3e46554301..86f59c0d80 100644
--- a/tools/libxl/libxl_arm.c
+++ b/tools/libxl/libxl_arm.c
@@ -410,7 +410,8 @@ static int make_psci_node(libxl__gc *gc, void *fdt)
res = fdt_begin_node(fdt, "psci");
if (res) return res;
- res = fdt_property_compat(gc, fdt, 2, "arm,psci-0.2","arm,psci");
+ res = fdt_property_compat(gc, fdt, 3, "arm,psci-1.0",
+ "arm,psci-0.2", "arm,psci");
if (res) return res;
res = fdt_property_string(fdt, "method", "hvc");
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 155c952349..941688a2ce 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -637,6 +637,7 @@ static int make_psci_node(void *fdt, const struct
dt_device_node *parent)
{
int res;
const char compat[] =
+ "arm,psci-1.0""\0"
"arm,psci-0.2""\0"
"arm,psci";
diff --git a/xen/arch/arm/vpsci.c b/xen/arch/arm/vpsci.c
index 6ab8ab64d0..e82b62db1a 100644
--- a/xen/arch/arm/vpsci.c
+++ b/xen/arch/arm/vpsci.c
@@ -106,7 +106,11 @@ static int32_t do_psci_cpu_off(uint32_t power_state)
static uint32_t do_psci_0_2_version(void)
{
- return PSCI_VERSION(0, 2);
+ /*
+ * PSCI is backward compatible from 0.2. So we can bump the version
+ * without any issue.
+ */
+ return PSCI_VERSION(1, 1);
}
static register_t do_psci_0_2_cpu_suspend(uint32_t power_state,
@@ -191,6 +195,29 @@ static void do_psci_0_2_system_reset(void)
domain_shutdown(d,SHUTDOWN_reboot);
}
+static int32_t do_psci_1_0_features(uint32_t psci_func_id)
+{
+ /* /!\ Ordered by function ID and not name */
+ switch ( psci_func_id )
+ {
+ case PSCI_0_2_FN32_PSCI_VERSION:
+ case PSCI_0_2_FN32_CPU_SUSPEND:
+ case PSCI_0_2_FN64_CPU_SUSPEND:
+ case PSCI_0_2_FN32_CPU_OFF:
+ case PSCI_0_2_FN32_CPU_ON:
+ case PSCI_0_2_FN64_CPU_ON:
+ case PSCI_0_2_FN32_AFFINITY_INFO:
+ case PSCI_0_2_FN64_AFFINITY_INFO:
+ case PSCI_0_2_FN32_MIGRATE_INFO_TYPE:
+ case PSCI_0_2_FN32_SYSTEM_OFF:
+ case PSCI_0_2_FN32_SYSTEM_RESET:
+ case PSCI_1_0_FN32_PSCI_FEATURES:
+ return 0;
+ default:
+ return PSCI_NOT_SUPPORTED;
+ }
+}
+
#define PSCI_SET_RESULT(reg, val) set_user_reg(reg, 0, val)
#define PSCI_ARG(reg, n) get_user_reg(reg, n)
@@ -304,6 +331,16 @@ bool do_vpsci_0_2_call(struct cpu_user_regs *regs,
uint32_t fid)
PSCI_SET_RESULT(regs, do_psci_0_2_affinity_info(taff, laff));
return true;
}
+
+ case PSCI_1_0_FN32_PSCI_FEATURES:
+ {
+ uint32_t psci_func_id = PSCI_ARG32(regs, 1);
+
+ perfc_incr(vpsci_features);
+ PSCI_SET_RESULT(regs, do_psci_1_0_features(psci_func_id));
+ return true;
+ }
+
default:
return false;
}
diff --git a/xen/include/asm-arm/perfc_defn.h b/xen/include/asm-arm/perfc_defn.h
index a7acb7d21c..87866264ca 100644
--- a/xen/include/asm-arm/perfc_defn.h
+++ b/xen/include/asm-arm/perfc_defn.h
@@ -31,6 +31,7 @@ PERFCOUNTER(vpsci_system_off, "vpsci: system_off")
PERFCOUNTER(vpsci_system_reset, "vpsci: system_reset")
PERFCOUNTER(vpsci_cpu_suspend, "vpsci: cpu_suspend")
PERFCOUNTER(vpsci_cpu_affinity_info, "vpsci: cpu_affinity_info")
+PERFCOUNTER(vpsci_features, "vpsci: features")
PERFCOUNTER(vgicd_reads, "vgicd: read")
PERFCOUNTER(vgicd_writes, "vgicd: write")
diff --git a/xen/include/asm-arm/psci.h b/xen/include/asm-arm/psci.h
index becc9f9ded..e2629eed01 100644
--- a/xen/include/asm-arm/psci.h
+++ b/xen/include/asm-arm/psci.h
@@ -40,6 +40,7 @@ void call_psci_system_reset(void);
#define PSCI_0_2_FN32_MIGRATE_INFO_TYPE PSCI_0_2_FN32(6)
#define PSCI_0_2_FN32_SYSTEM_OFF PSCI_0_2_FN32(8)
#define PSCI_0_2_FN32_SYSTEM_RESET PSCI_0_2_FN32(9)
+#define PSCI_1_0_FN32_PSCI_FEATURES PSCI_0_2_FN32(10)
#define PSCI_0_2_FN64_CPU_SUSPEND PSCI_0_2_FN64(1)
#define PSCI_0_2_FN64_CPU_ON PSCI_0_2_FN64(3)
diff --git a/xen/include/asm-arm/vpsci.h b/xen/include/asm-arm/vpsci.h
index 035a41e812..0cca5e6830 100644
--- a/xen/include/asm-arm/vpsci.h
+++ b/xen/include/asm-arm/vpsci.h
@@ -23,7 +23,7 @@
#include <asm/psci.h>
/* Number of function implemented by virtual PSCI (only 0.2 or later) */
-#define VPSCI_NR_FUNCS 11
+#define VPSCI_NR_FUNCS 12
/* Functions handle PSCI calls from the guests */
bool do_vpsci_0_1_call(struct cpu_user_regs *regs, uint32_t fid);
--
2.11.0
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