ACPI: Add fixups for AMD P-state figures

Some AMD systems may round the frequencies in ACPI tables to 100MHz
boundaries. We can obtain the real frequencies from MSRs, so add a quirk
to fix these frequencies up on AMD systems.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 1e1f3eb..fbee971 100644 (file)
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -248,6 +248,7 @@
 
 #define MSR_IA32_PERF_STATUS           0x00000198
 #define MSR_IA32_PERF_CTL              0x00000199
+#define MSR_AMD_PSTATE_DEF_BASE                0xc0010064
 #define MSR_AMD_PERF_STATUS            0xc0010063
 #define MSR_AMD_PERF_CTL               0xc0010062
 

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index a093dc1..836bfe0 100644 (file)
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -324,6 +324,34 @@ static int acpi_processor_get_performance_control(struct acpi_processor *pr)
        return result;
 }
 
+#ifdef CONFIG_X86
+/*
+ * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
+ * in their ACPI data. Calculate the real values and fix up the _PSS data.
+ */
+static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
+{
+       u32 hi, lo, fid, did;
+       int index = px->control & 0x00000007;
+
+       if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+               return;
+
+       if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
+           || boot_cpu_data.x86 == 0x11) {
+               rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
+               fid = lo & 0x3f;
+               did = (lo >> 6) & 7;
+               if (boot_cpu_data.x86 == 0x10)
+                       px->core_frequency = (100 * (fid + 0x10)) >> did;
+               else
+                       px->core_frequency = (100 * (fid + 8)) >> did;
+       }
+}
+#else
+static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
+#endif
+
 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
 {
        int result = 0;
@@ -379,6 +407,8 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
                        goto end;
                }
 
+               amd_fixup_frequency(px, i);
+
                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
                                  i,