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Thu, 22 Jan 2026 01:43:52 -0800 (PST) Message-ID: <715604a8-265b-4832-8001-1a2dbdc870bb@suse.com> Date: Thu, 22 Jan 2026 10:43:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH 5/5] cpufreq/amd-cppc: move pxfreq_mhz into driver data From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Penny Zheng References: Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1769075314695158500 Content-Type: text/plain; charset="utf-8" No reason for it to be a separate per-CPU item; it's connected to a struct cpufreq_policy instance just like other driver data. This also eliminates the concern over amd_cppc_cpufreq_cpu_init() being called for all CPUs, or a CPU going offline that's recorded in policy->cpu (which would result in accesses of per-CPU data of offline CPUs). Signed-off-by: Jan Beulich Reviewed-by: Penny Zheng --- a/xen/arch/x86/acpi/cpufreq/amd-cppc.c +++ b/xen/arch/x86/acpi/cpufreq/amd-cppc.c @@ -30,11 +30,6 @@ printk(XENLOG_DEBUG "AMD-CPPC: CPU%u " fmt, cpu, ## args); \ }) =20 -/* - * Core max frequency read from PstateDef as anchor point - * for freq-to-perf transition - */ -static DEFINE_PER_CPU_READ_MOSTLY(unsigned int, pxfreq_mhz); #ifndef NDEBUG static bool __ro_after_init opt_active_mode; #else @@ -117,7 +112,7 @@ static int amd_cppc_khz_to_perf(const st { /* Read Processor Max Speed(MHz) as anchor point */ mul =3D data->caps.highest_perf; - div =3D this_cpu(pxfreq_mhz); + div =3D data->pxfreq_mhz; if ( !div ) return -EOPNOTSUPP; } @@ -160,7 +155,7 @@ static int amd_get_cpc_freq(const struct } =20 /* Read Processor Max Speed(MHz) as anchor point */ - mul =3D this_cpu(pxfreq_mhz); + mul =3D data->pxfreq_mhz; if ( !mul ) return -EOPNOTSUPP; div =3D data->caps.highest_perf; @@ -287,7 +282,7 @@ static void cf_check amd_cppc_init_msrs( } =20 amd_process_freq(&cpu_data[policy->cpu], - NULL, NULL, &this_cpu(pxfreq_mhz)); + NULL, NULL, &data->pxfreq_mhz); =20 data->err =3D amd_get_cpc_freq(data, data->cppc_data->cpc.lowest_mhz, data->caps.lowest_perf, &min_freq); --- a/xen/include/acpi/cpufreq/cpufreq.h +++ b/xen/include/acpi/cpufreq/cpufreq.h @@ -145,6 +145,12 @@ struct amd_cppc_drv_data { =20 uint8_t epp_init; =20 + /* + * Core max frequency read from PstateDef as anchor point + * for freq-to-perf transition + */ + unsigned int pxfreq_mhz; + int err; };