# HG changeset patch
# User mark.langsdorf@xxxxxxx
# Date 1270011023 18000
# Node ID 51fb1cb291c5741262afac766c69c219306fca99
# Parent 9da598418e6da7758a799e116dc8bf3c3ed2f473
Add support for disabling AMD's Boost feature. Boost is similar to
Intel's Turbo and uses the same high level interface. The low
level implementation is different and encapsulated in the powernow
driver for cpufreq.
Signed-off-by: Mark Langsdorf <mark.langsdorf@xxxxxxx>
diff -r 9da598418e6d -r 51fb1cb291c5 xen/arch/x86/acpi/cpufreq/powernow.c
--- a/xen/arch/x86/acpi/cpufreq/powernow.c Tue Mar 30 23:49:53 2010 -0500
+++ b/xen/arch/x86/acpi/cpufreq/powernow.c Tue Mar 30 23:50:23 2010 -0500
@@ -39,6 +39,7 @@
#include <acpi/cpufreq/cpufreq.h>
#define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007
+#define CPB_CAPABLE 0x00000200
#define USE_HW_PSTATE 0x00000080
#define HW_PSTATE_MASK 0x00000007
#define HW_PSTATE_VALID_MASK 0x80000000
@@ -48,6 +49,7 @@
#define MSR_PSTATE_STATUS 0xc0010063 /* Pstate Status MSR */
#define MSR_PSTATE_CTRL 0xc0010062 /* Pstate control MSR */
#define MSR_PSTATE_CUR_LIMIT 0xc0010061 /* pstate current limit MSR */
+#define MSR_HWCR_CPBDIS_MASK 0x02000000
struct powernow_cpufreq_data {
struct processor_performance *acpi_data;
@@ -62,8 +64,8 @@
struct drv_cmd {
unsigned int type;
cpumask_t mask;
- u64 addr;
u32 val;
+ int turbo;
};
static void transition_pstate(void *drvcmd)
@@ -71,6 +73,15 @@
struct drv_cmd *cmd;
cmd = (struct drv_cmd *) drvcmd;
+ if (cmd->turbo != 0) {
+ u32 lo, hi;
+ rdmsr(MSR_K8_HWCR, lo, hi);
+ if (cmd->turbo == 1)
+ lo &= ~MSR_HWCR_CPBDIS_MASK;
+ else
+ lo |= MSR_HWCR_CPBDIS_MASK;
+ wrmsr(MSR_K8_HWCR, lo, hi);
+ }
wrmsr(MSR_PSTATE_CTRL, cmd->val, 0);
}
@@ -121,6 +132,7 @@
freqs.new = data->freq_table[next_state].frequency;
cmd.val = next_perf_state;
+ cmd.turbo = policy->turbo;
on_selected_cpus(&cmd.mask, transition_pstate, &cmd, 0);
@@ -159,6 +171,7 @@
unsigned int result = 0;
struct processor_performance *perf;
u32 max_hw_pstate, hi = 0, lo = 0;
+ struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
data = xmalloc(struct powernow_cpufreq_data);
if (!data)
@@ -234,6 +247,15 @@
if (result)
goto err_freqfree;
+ if (c->cpuid_level >= 6) {
+ unsigned int edx;
+ edx = cpuid_edx(CPUID_FREQ_VOLT_CAPABILITIES);
+ if ((edx & CPB_CAPABLE) == CPB_CAPABLE) {
+ policy->turbo = 1;
+ printk(XENLOG_INFO "Core Boost/Turbo detected and enabled\n");
+ }
+ }
+
/*
* the first call to ->target() should result in us actually
* writing something to the appropriate registers.
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