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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-07-29 20:05:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-07-29 20:05:06 -0700 |
| commit | 98e8f2c0e0930feee6a2538450c74d9d7de0a9cc (patch) | |
| tree | 24761f8ebbc34e6db6a5064e6e193aba825b2f5a /arch/x86/kernel | |
| parent | e12ac84acc722f06e8b1be66fbb138c5934aaf54 (diff) | |
| parent | f12682148262aa6deed32c0593c67658573d0600 (diff) | |
Merge tag 'x86-platform-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 platform updates from Ingo Molnar:
"This adds support for the AMD hardware feedback interface (HFI), by
Perry Yuan"
* tag 'x86-platform-2025-07-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/itmt: Add debugfs file to show core priorities
platform/x86/amd: hfi: Add debugfs support
platform/x86/amd: hfi: Set ITMT priority from ranking data
cpufreq/amd-pstate: Disable preferred cores on designs with workload classification
x86/process: Clear hardware feedback history for AMD processors
platform/x86: hfi: Add power management callback
platform/x86: hfi: Add online and offline callback support
platform/x86: hfi: Init per-cpu scores for each class
platform/x86: hfi: Parse CPU core ranking data from shared memory
platform/x86: hfi: Introduce AMD Hardware Feedback Interface Driver
x86/msr-index: Add AMD workload classification MSRs
MAINTAINERS: Add maintainer entry for AMD Hardware Feedback Driver
Documentation/x86: Add AMD Hardware Feedback Interface documentation
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/itmt.c | 23 | ||||
| -rw-r--r-- | arch/x86/kernel/process_64.c | 4 |
2 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c index 9cea1fc36c18..243a769fdd97 100644 --- a/arch/x86/kernel/itmt.c +++ b/arch/x86/kernel/itmt.c @@ -59,6 +59,18 @@ static ssize_t sched_itmt_enabled_write(struct file *filp, return result; } +static int sched_core_priority_show(struct seq_file *s, void *unused) +{ + int cpu; + + seq_puts(s, "CPU #\tPriority\n"); + for_each_possible_cpu(cpu) + seq_printf(s, "%d\t%d\n", cpu, arch_asym_cpu_priority(cpu)); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(sched_core_priority); + static const struct file_operations dfs_sched_itmt_fops = { .read = debugfs_read_file_bool, .write = sched_itmt_enabled_write, @@ -67,6 +79,7 @@ static const struct file_operations dfs_sched_itmt_fops = { }; static struct dentry *dfs_sched_itmt; +static struct dentry *dfs_sched_core_prio; /** * sched_set_itmt_support() - Indicate platform supports ITMT @@ -102,6 +115,14 @@ int sched_set_itmt_support(void) return -ENOMEM; } + dfs_sched_core_prio = debugfs_create_file("sched_core_priority", 0644, + arch_debugfs_dir, NULL, + &sched_core_priority_fops); + if (IS_ERR_OR_NULL(dfs_sched_core_prio)) { + dfs_sched_core_prio = NULL; + return -ENOMEM; + } + sched_itmt_capable = true; sysctl_sched_itmt_enabled = 1; @@ -133,6 +154,8 @@ void sched_clear_itmt_support(void) debugfs_remove(dfs_sched_itmt); dfs_sched_itmt = NULL; + debugfs_remove(dfs_sched_core_prio); + dfs_sched_core_prio = NULL; if (sysctl_sched_itmt_enabled) { /* disable sched_itmt if we are no longer ITMT capable */ diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index b972bf72fb8b..52a5c03c353c 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -707,6 +707,10 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) /* Load the Intel cache allocation PQR MSR. */ resctrl_arch_sched_in(next_p); + /* Reset hw history on AMD CPUs */ + if (cpu_feature_enabled(X86_FEATURE_AMD_WORKLOAD_CLASS)) + wrmsrl(MSR_AMD_WORKLOAD_HRST, 0x1); + return prev_p; } |