Xen devel - Oct 2009 - [PATCH][resubmit] Update powernow.c to latest cpufreq code

The general cpufreq infrastructure has been improved over the
last year.  Update the AMD PowerNow! driver powernow.c to
take advantage of those improvements.

Specifically, addresses Novell bugzilla # 530035.

Signed-of-by: Mark Langsdorf <mark.langsdorf@amd.com>

diff -r da620c454916 xen/arch/x86/acpi/cpufreq/cpufreq.c
--- a/xen/arch/x86/acpi/cpufreq/cpufreq.c	Thu Aug 13 08:40:39 2009 +0100
+++ b/xen/arch/x86/acpi/cpufreq/cpufreq.c	Tue Sep 29 14:00:43 2009 -0500
@@ -661,6 +661,9 @@
     if ((cpufreq_controller == FREQCTL_xen) &&
         (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL))
         ret = cpufreq_register_driver(&acpi_cpufreq_driver);
+    else if ((cpufreq_controller == FREQCTL_xen) &&
+        (boot_cpu_data.x86_vendor == X86_VENDOR_AMD))
+        ret = powernow_register_driver();
 
     return ret;
 }
@@ -676,9 +679,8 @@
     /* Currently we only handle Intel and AMD processor */
     if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL )
         ret = cpufreq_add_cpu(cpuid);
-    else if ( (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
-            (cpu_count == num_online_cpus()) )
-        ret = powernow_cpufreq_init();
+    else if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
+        ret = cpufreq_add_cpu(cpuid);
     else
         ret = -EFAULT;
     return ret;
diff -r da620c454916 xen/arch/x86/acpi/cpufreq/powernow.c
--- a/xen/arch/x86/acpi/cpufreq/powernow.c	Thu Aug 13 08:40:39 2009 +0100
+++ b/xen/arch/x86/acpi/cpufreq/powernow.c	Tue Sep 29 14:00:43 2009 -0500
@@ -85,6 +85,7 @@
     unsigned int next_state = 0; /* Index into freq_table */
     unsigned int next_perf_state = 0; /* Index into perf table */
     int result = 0;
+    int j = 0;
 
     if (unlikely(data == NULL ||
         data->acpi_data == NULL || data->freq_table == NULL)) {
@@ -123,6 +124,9 @@
 
     on_selected_cpus(&cmd.mask, transition_pstate, &cmd, 0);
 
+    for_each_cpu_mask(j, online_policy_cpus)
+        cpufreq_statistic_update(j, perf->state, next_perf_state);
+
     perf->state = next_perf_state;
     policy->cur = freqs.new;
 
@@ -132,10 +136,17 @@
 static int powernow_cpufreq_verify(struct cpufreq_policy *policy)
 {
     struct powernow_cpufreq_data *data;
+    struct processor_performance *perf;
 
-    if (!policy || !(data = drv_data[policy->cpu]))
+    if (!policy || !(data = drv_data[policy->cpu]) ||
+        !processor_pminfo[policy->cpu])
         return -EINVAL;
 
+    perf = &processor_pminfo[policy->cpu]->perf;
+
+    cpufreq_verify_within_limits(policy, 0, 
+        perf->states[perf->platform_limit].core_frequency * 1000);
+
     return cpufreq_frequency_table_verify(policy, data->freq_table);
 }
 
@@ -202,6 +213,8 @@
                 perf->states[i].transition_latency * 1000;
     }
 
+    policy->governor = cpufreq_opt_governor ? : CPUFREQ_DEFAULT_GOVERNOR;
+
     data->max_freq = perf->states[0].core_frequency * 1000;
     /* table init */
     for (i = 0; i < perf->state_count && i <= max_hw_pstate;
i++) {
@@ -259,10 +272,17 @@
     .exit   = powernow_cpufreq_cpu_exit
 };
 
+unsigned int powernow_register_driver()
+{
+    unsigned int ret;
+    ret = cpufreq_register_driver(&powernow_cpufreq_driver);
+    return ret;
+}
+
 int powernow_cpufreq_init(void)
 {
     unsigned int i, ret = 0;
-    unsigned int dom, max_dom = 0;
+    unsigned int max_dom = 0;
     cpumask_t *pt;
     unsigned long *dom_mask;
 
@@ -304,46 +324,6 @@
         processor_pminfo[i]->perf.shared_cpu_map             
pt[processor_pminfo[i]->perf.domain_info.domain];
 
-    cpufreq_driver = &powernow_cpufreq_driver;
-
-    /* setup cpufreq infrastructure */
-    for_each_online_cpu(i) {
-        struct cpufreq_policy *policy = cpufreq_cpu_policy[i];
-
-        if (!policy) {
-            unsigned int firstcpu;
-
-            firstcpu = first_cpu(processor_pminfo[i]->perf.shared_cpu_map);
-            if (i == firstcpu) {
-                policy = xmalloc(struct cpufreq_policy);
-                if (!policy) {
-                    ret = -ENOMEM;
-                    goto cpufreq_init_out;
-                }
-                memset(policy, 0, sizeof(struct cpufreq_policy));
-                policy->cpu = i;
-            } else
-                policy = cpufreq_cpu_policy[firstcpu];
-            cpu_set(i, policy->cpus);
-            cpufreq_cpu_policy[i] = policy;
-        }
-
-        ret = powernow_cpufreq_cpu_init(policy);
-        if (ret)
-            goto cpufreq_init_out;
-    }
-
-    /* setup ondemand cpufreq */
-    for (dom = 0; dom < max_dom; dom++) {
-        if (!test_bit(dom, dom_mask))
-            continue;
-        i = first_cpu(pt[dom]);
-        ret = cpufreq_governor_dbs(cpufreq_cpu_policy[i], CPUFREQ_GOV_START);
-        if (ret)
-            goto cpufreq_init_out;
-    }
-
-cpufreq_init_out:
     xfree(pt);
     xfree(dom_mask);
    
diff -r da620c454916 xen/include/acpi/cpufreq/processor_perf.h
--- a/xen/include/acpi/cpufreq/processor_perf.h	Thu Aug 13 08:40:39 2009 +0100
+++ b/xen/include/acpi/cpufreq/processor_perf.h	Tue Sep 29 14:00:43 2009 -0500
@@ -8,6 +8,7 @@
 
 int get_cpu_id(u8);
 int powernow_cpufreq_init(void);
+unsigned int powernow_register_driver(void);
 
 void cpufreq_residency_update(unsigned int, uint8_t);
 void cpufreq_statistic_update(unsigned int, uint8_t, uint8_t);

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