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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Feb 2025 08:33:23.5596 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6b7305a-0514-4307-5c83-08dd4688eb76 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF0000468B.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8294 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1738830845411019100 Content-Type: text/plain; charset="utf-8" In order to provide backward compatibility with existing governors that represent performance as frequencies, like ondemand, the _CPC table can optionally provide processor frequency range values, Lowest frequency and Norminal frequency, to let OS use Lowest Frequency/ Performance and Nominal Frequency/Performance as anchor points to create linear mapping of CPPC abstract performance to CPU frequency. As Xen is uncapable of parsing the ACPI dynamic table, this commit introduces a new sub-hypercall to propagate required CPPC data from dom0 kernel. Signed-off-by: Penny Zheng --- v1 -> v2: - Remove unnecessary figure braces - Pointer-to-const for print_CPPC and set_cppc_pminfo - Structure allocation shall use xvzalloc() - Unnecessary memcpy(), and change it to a (type safe) structure assignment - Add comment for struct xen_processor_cppc, and keep the chosen fields in the order _CPC has them - Obey to alphabetic sorting, and prefix compat structures with ? instead of ! --- xen/arch/x86/platform_hypercall.c | 4 ++ xen/arch/x86/x86_64/cpufreq.c | 2 + xen/drivers/cpufreq/cpufreq.c | 48 +++++++++++++++++++++++ xen/include/acpi/cpufreq/processor_perf.h | 1 + xen/include/public/platform.h | 16 ++++++++ xen/include/xen/pmstat.h | 1 + xen/include/xlat.lst | 1 + 7 files changed, 73 insertions(+) diff --git a/xen/arch/x86/platform_hypercall.c b/xen/arch/x86/platform_hype= rcall.c index 67f851237d..735c71b0e7 100644 --- a/xen/arch/x86/platform_hypercall.c +++ b/xen/arch/x86/platform_hypercall.c @@ -572,6 +572,10 @@ ret_t do_platform_op( break; } =20 + case XEN_PM_CPPC: + ret =3D set_cppc_pminfo(op->u.set_pminfo.id, &op->u.set_pminfo= .u.cppc_data); + break; + default: ret =3D -EINVAL; break; diff --git a/xen/arch/x86/x86_64/cpufreq.c b/xen/arch/x86/x86_64/cpufreq.c index e4f3d5b436..aa72037401 100644 --- a/xen/arch/x86/x86_64/cpufreq.c +++ b/xen/arch/x86/x86_64/cpufreq.c @@ -26,6 +26,8 @@ #include #include =20 +CHECK_processor_cppc; + CHECK_processor_px; =20 DEFINE_XEN_GUEST_HANDLE(compat_processor_px_t); diff --git a/xen/drivers/cpufreq/cpufreq.c b/xen/drivers/cpufreq/cpufreq.c index 4a103c6de9..f5e8bfa09e 100644 --- a/xen/drivers/cpufreq/cpufreq.c +++ b/xen/drivers/cpufreq/cpufreq.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include =20 @@ -458,6 +459,53 @@ static void print_PPC(unsigned int platform_limit) printk("\t_PPC: %d\n", platform_limit); } =20 +static void print_CPPC(const struct xen_processor_cppc *cppc_data) +{ + printk("\t_CPC: highest_perf=3D%u, lowest_perf=3D%u, " + "nominal_perf=3D%u, lowest_nonlinear_perf=3D%u, " + "nominal_freq=3D%uMhz, lowest_freq=3D%uMhz\n", + cppc_data->highest_perf, cppc_data->lowest_perf, + cppc_data->nominal_perf, cppc_data->lowest_nonlinear_perf, + cppc_data->nominal_freq, cppc_data->lowest_freq); +} + +int set_cppc_pminfo(uint32_t acpi_id, const struct xen_processor_cppc *cpp= c_data) +{ + int ret =3D 0, cpuid; + struct processor_pminfo *pm_info; + + cpuid =3D get_cpu_id(acpi_id); + if ( cpuid < 0 || !cppc_data ) + { + ret =3D -EINVAL; + goto out; + } + if ( cpufreq_verbose ) + printk("Set CPU acpi_id(%d) cpuid(%d) CPPC State info:\n", + acpi_id, cpuid); + + pm_info =3D processor_pminfo[cpuid]; + if ( !pm_info ) + { + pm_info =3D xvzalloc(struct processor_pminfo); + if ( !pm_info ) + { + ret =3D -ENOMEM; + goto out; + } + processor_pminfo[cpuid] =3D pm_info; + } + pm_info->acpi_id =3D acpi_id; + pm_info->id =3D cpuid; + pm_info->cppc_data =3D *cppc_data; + + if ( cpufreq_verbose ) + print_CPPC(&pm_info->cppc_data); + + out: + return ret; +} + int set_px_pminfo(uint32_t acpi_id, struct xen_processor_performance *perf) { int ret =3D 0, cpu; diff --git a/xen/include/acpi/cpufreq/processor_perf.h b/xen/include/acpi/c= pufreq/processor_perf.h index 301104e16f..cfa0fed647 100644 --- a/xen/include/acpi/cpufreq/processor_perf.h +++ b/xen/include/acpi/cpufreq/processor_perf.h @@ -37,6 +37,7 @@ struct processor_pminfo { uint32_t acpi_id; uint32_t id; struct processor_performance perf; + struct xen_processor_cppc cppc_data; }; =20 extern struct processor_pminfo *processor_pminfo[NR_CPUS]; diff --git a/xen/include/public/platform.h b/xen/include/public/platform.h index 2725b8d104..b8daa8fc42 100644 --- a/xen/include/public/platform.h +++ b/xen/include/public/platform.h @@ -363,6 +363,7 @@ DEFINE_XEN_GUEST_HANDLE(xenpf_getidletime_t); #define XEN_PM_PX 1 #define XEN_PM_TX 2 #define XEN_PM_PDC 3 +#define XEN_PM_CPPC 4 =20 /* Px sub info type */ #define XEN_PX_PCT 1 @@ -432,6 +433,20 @@ struct xen_processor_px { typedef struct xen_processor_px xen_processor_px_t; DEFINE_XEN_GUEST_HANDLE(xen_processor_px_t); =20 +/* + * Subset _CPC fields useful for CPPC-compatible cpufreq + * driver's initialization + */ +struct xen_processor_cppc { + uint32_t highest_perf; + uint32_t nominal_perf; + uint32_t lowest_nonlinear_perf; + uint32_t lowest_perf; + uint32_t lowest_freq; + uint32_t nominal_freq; +}; +typedef struct xen_processor_cppc xen_processor_cppc_t; + struct xen_psd_package { uint64_t num_entries; uint64_t revision; @@ -465,6 +480,7 @@ struct xenpf_set_processor_pminfo { struct xen_processor_power power;/* Cx: _CST/_CSD */ struct xen_processor_performance perf; /* Px: _PPC/_PCT/_PSS/_P= SD */ XEN_GUEST_HANDLE(uint32) pdc; /* _PDC */ + xen_processor_cppc_t cppc_data; /*_CPC */ } u; }; typedef struct xenpf_set_processor_pminfo xenpf_set_processor_pminfo_t; diff --git a/xen/include/xen/pmstat.h b/xen/include/xen/pmstat.h index 8350403e95..d2fe74ef0b 100644 --- a/xen/include/xen/pmstat.h +++ b/xen/include/xen/pmstat.h @@ -5,6 +5,7 @@ #include /* for struct xen_processor_power */ #include /* for struct pm_cx_stat */ =20 +int set_cppc_pminfo(uint32_t cpu, const struct xen_processor_cppc *cppc_da= ta); int set_px_pminfo(uint32_t acpi_id, struct xen_processor_performance *perf= ); long set_cx_pminfo(uint32_t acpi_id, struct xen_processor_power *power); =20 diff --git a/xen/include/xlat.lst b/xen/include/xlat.lst index 3c7b6c6830..20201c1667 100644 --- a/xen/include/xlat.lst +++ b/xen/include/xlat.lst @@ -162,6 +162,7 @@ =20 ! pct_register platform.h ! power_register platform.h +? processor_cppc platform.h ? processor_csd platform.h ! processor_cx platform.h ! processor_flags platform.h --=20 2.34.1