mirror of https://gitee.com/openkylin/linux.git
xen/acpi: upload _PSD info for non Dom0 CPUs too
All uploaded PM data from non-dom0 CPUs takes the info from vCPU 0 and changing only the acpi_id. For processors which P-state coordination type is HW_ALL (0xFD) it is OK to upload bogus P-state dependency information (_PSD), because Xen will ignore any cpufreq domains created for past CPUs. Albeit for platforms which expose coordination types as SW_ANY or SW_ALL, this will have some unintended side effects. Effectively, it will look at the P-state domain existence and *if it already exists* it will skip the acpi-cpufreq initialization and thus inherit the policy from the first CPU in the cpufreq domain. This will finally lead to the original cpu not changing target freq to P0 other than the first in the domain. Which will make turbo boost not getting enabled (e.g. for 'performance' governor) for all cpus. This patch fixes that, by also evaluating _PSD when we enumerate all ACPI processors and thus always uploading the correct info to Xen. We export acpi_processor_get_psd() for that this purpose, but change signature to not assume an existent of acpi_processor given that ACPI isn't creating an acpi_processor for non-dom0 CPUs. Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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36104cb901
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@ -533,7 +533,7 @@ int acpi_processor_notify_smm(struct module *calling_module)
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EXPORT_SYMBOL(acpi_processor_notify_smm);
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static int acpi_processor_get_psd(struct acpi_processor *pr)
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int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
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{
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int result = 0;
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acpi_status status = AE_OK;
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@ -541,9 +541,8 @@ static int acpi_processor_get_psd(struct acpi_processor *pr)
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struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
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struct acpi_buffer state = {0, NULL};
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union acpi_object *psd = NULL;
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struct acpi_psd_package *pdomain;
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status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
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status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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return -ENODEV;
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}
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@ -561,8 +560,6 @@ static int acpi_processor_get_psd(struct acpi_processor *pr)
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goto end;
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}
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pdomain = &(pr->performance->domain_info);
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state.length = sizeof(struct acpi_psd_package);
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state.pointer = pdomain;
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@ -597,6 +594,7 @@ static int acpi_processor_get_psd(struct acpi_processor *pr)
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kfree(buffer.pointer);
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return result;
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}
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EXPORT_SYMBOL(acpi_processor_get_psd);
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int acpi_processor_preregister_performance(
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struct acpi_processor_performance __percpu *performance)
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@ -645,7 +643,8 @@ int acpi_processor_preregister_performance(
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pr->performance = per_cpu_ptr(performance, i);
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cpumask_set_cpu(i, pr->performance->shared_cpu_map);
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if (acpi_processor_get_psd(pr)) {
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pdomain = &(pr->performance->domain_info);
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if (acpi_processor_get_psd(pr->handle, pdomain)) {
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retval = -EINVAL;
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continue;
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}
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@ -53,6 +53,8 @@ static unsigned long *acpi_ids_done;
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static unsigned long *acpi_id_present;
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/* And if there is an _CST definition (or a PBLK) for the ACPI IDs */
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static unsigned long *acpi_id_cst_present;
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/* Which ACPI P-State dependencies for a enumerated processor */
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static struct acpi_psd_package *acpi_psd;
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static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
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{
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@ -372,6 +374,13 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
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pr_debug("ACPI CPU%u w/ PBLK:0x%lx\n", acpi_id, (unsigned long)pblk);
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/* It has P-state dependencies */
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if (!acpi_processor_get_psd(handle, &acpi_psd[acpi_id])) {
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pr_debug("ACPI CPU%u w/ PST:coord_type = %llu domain = %llu\n",
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acpi_id, acpi_psd[acpi_id].coord_type,
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acpi_psd[acpi_id].domain);
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}
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status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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if (!pblk)
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@ -405,6 +414,14 @@ static int check_acpi_ids(struct acpi_processor *pr_backup)
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return -ENOMEM;
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}
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acpi_psd = kcalloc(nr_acpi_bits, sizeof(struct acpi_psd_package),
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GFP_KERNEL);
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if (!acpi_psd) {
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kfree(acpi_id_present);
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kfree(acpi_id_cst_present);
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return -ENOMEM;
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}
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acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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read_acpi_id, NULL, NULL, NULL);
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@ -417,6 +434,12 @@ static int check_acpi_ids(struct acpi_processor *pr_backup)
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pr_backup->acpi_id = i;
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/* Mask out C-states if there are no _CST or PBLK */
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pr_backup->flags.power = test_bit(i, acpi_id_cst_present);
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/* num_entries is non-zero if we evaluated _PSD */
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if (acpi_psd[i].num_entries) {
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memcpy(&pr_backup->performance->domain_info,
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&acpi_psd[i],
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sizeof(struct acpi_psd_package));
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}
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(void)upload_pm_data(pr_backup);
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}
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}
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@ -566,6 +589,7 @@ static void __exit xen_acpi_processor_exit(void)
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kfree(acpi_ids_done);
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kfree(acpi_id_present);
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kfree(acpi_id_cst_present);
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kfree(acpi_psd);
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for_each_possible_cpu(i)
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acpi_processor_unregister_performance(i);
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@ -254,6 +254,8 @@ int acpi_processor_pstate_control(void);
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/* note: this locks both the calling module and the processor module
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if a _PPC object exists, rmmod is disallowed then */
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int acpi_processor_notify_smm(struct module *calling_module);
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int acpi_processor_get_psd(acpi_handle handle,
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struct acpi_psd_package *pdomain);
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/* parsing the _P* objects. */
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extern int acpi_processor_get_performance_info(struct acpi_processor *pr);
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