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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v3 01/17] xen/arm: vpsci: Add support for PSCI 1.1
On Thu, 15 Feb 2018, Julien Grall wrote:
> 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
Acked-by: Stefano Stabellini <sstabellini@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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