1 files changed, 40 insertions, 366 deletions

diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index 1a40935c85fd..129e80bfff22 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -48,22 +48,12 @@
 #define PFX "powernow-k8: "
 #define VERSION "version 2.20.00"
 #include "powernow-k8.h"
-#include "mperf.h"
 
 /* serialize freq changes  */
 static DEFINE_MUTEX(fidvid_mutex);
 
 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
 
-static int cpu_family = CPU_OPTERON;
-
-/* array to map SW pstate number to acpi state */
-static u32 ps_to_as[8];
-
-/* core performance boost */
-static bool cpb_capable, cpb_enabled;
-static struct msr __percpu *msrs;
-
 static struct cpufreq_driver cpufreq_amd64_driver;
 
 #ifndef CONFIG_SMP
@@ -85,12 +75,6 @@ static u32 find_khz_freq_from_fid(u32 fid)
         return 1000 * find_freq_from_fid(fid);
 }
 
-static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data,
-                                     u32 pstate)
-{
-        return data[ps_to_as[pstate]].frequency;
-}
-
 /* Return the vco fid for an input fid
  *
  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
@@ -113,9 +97,6 @@ static int pending_bit_stuck(void)
 {
         u32 lo, hi;
 
-        if (cpu_family == CPU_HW_PSTATE)
-                return 0;
-
         rdmsr(MSR_FIDVID_STATUS, lo, hi);
         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 }
@@ -129,20 +110,6 @@ static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
         u32 lo, hi;
         u32 i = 0;
 
-        if (cpu_family == CPU_HW_PSTATE) {
-                rdmsr(MSR_PSTATE_STATUS, lo, hi);
-                i = lo & HW_PSTATE_MASK;
-                data->currpstate = i;
-
-                /*
-                 * a workaround for family 11h erratum 311 might cause
-                 * an "out-of-range Pstate if the core is in Pstate-0
-                 */
-                if ((boot_cpu_data.x86 == 0x11) && (i >= data->numps))
-                        data->currpstate = HW_PSTATE_0;
-
-                return 0;
-        }
         do {
                 if (i++ > 10000) {
                         pr_debug("detected change pending stuck\n");
@@ -299,14 +266,6 @@ static int decrease_vid_code_by_step(struct powernow_k8_data *data,
         return 0;
 }
 
-/* Change hardware pstate by single MSR write */
-static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
-{
-        wrmsr(MSR_PSTATE_CTRL, pstate, 0);
-        data->currpstate = pstate;
-        return 0;
-}
-
 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 static int transition_fid_vid(struct powernow_k8_data *data,
                 u32 reqfid, u32 reqvid)
@@ -523,8 +482,6 @@ static int core_voltage_post_transition(struct powernow_k8_data *data,
 static const struct x86_cpu_id powernow_k8_ids[] = {
         /* IO based frequency switching */
         { X86_VENDOR_AMD, 0xf },
-        /* MSR based frequency switching supported */
-        X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
         {}
 };
 MODULE_DEVICE_TABLE(x86cpu, powernow_k8_ids);
@@ -560,15 +517,8 @@ static void check_supported_cpu(void *_rc)
                                 "Power state transitions not supported\n");
                         return;
                 }
-        } else { /* must be a HW Pstate capable processor */
-                cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
-                if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
-                        cpu_family = CPU_HW_PSTATE;
-                else
-                        return;
+                *rc = 0;
         }
-
-        *rc = 0;
 }
 
 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
@@ -632,18 +582,11 @@ static void print_basics(struct powernow_k8_data *data)
         for (j = 0; j < data->numps; j++) {
                 if (data->powernow_table[j].frequency !=
                                 CPUFREQ_ENTRY_INVALID) {
-                        if (cpu_family == CPU_HW_PSTATE) {
-                                printk(KERN_INFO PFX
-                                        "   %d : pstate %d (%d MHz)\n", j,
-                                        data->powernow_table[j].index,
-                                        data->powernow_table[j].frequency/1000);
-                        } else {
                                 printk(KERN_INFO PFX
                                         "fid 0x%x (%d MHz), vid 0x%x\n",
                                         data->powernow_table[j].index & 0xff,
                                         data->powernow_table[j].frequency/1000,
                                         data->powernow_table[j].index >> 8);
-                        }
                 }
         }
         if (data->batps)
@@ -651,20 +594,6 @@ static void print_basics(struct powernow_k8_data *data)
                                 data->batps);
 }
 
-static u32 freq_from_fid_did(u32 fid, u32 did)
-{
-        u32 mhz = 0;
-
-        if (boot_cpu_data.x86 == 0x10)
-                mhz = (100 * (fid + 0x10)) >> did;
-        else if (boot_cpu_data.x86 == 0x11)
-                mhz = (100 * (fid + 8)) >> did;
-        else
-                BUG();
-
-        return mhz * 1000;
-}
-
 static int fill_powernow_table(struct powernow_k8_data *data,
                 struct pst_s *pst, u8 maxvid)
 {
@@ -824,7 +753,7 @@ static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
 {
         u64 control;
 
-        if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
+        if (!data->acpi_data.state_count)
                 return;
 
         control = data->acpi_data.states[index].control;
@@ -875,10 +804,7 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
         data->numps = data->acpi_data.state_count;
         powernow_k8_acpi_pst_values(data, 0);
 
-        if (cpu_family == CPU_HW_PSTATE)
-                ret_val = fill_powernow_table_pstate(data, powernow_table);
-        else
-                ret_val = fill_powernow_table_fidvid(data, powernow_table);
+        ret_val = fill_powernow_table_fidvid(data, powernow_table);
         if (ret_val)
                 goto err_out_mem;
 
@@ -915,51 +841,6 @@ err_out:
         return ret_val;
 }
 
-static int fill_powernow_table_pstate(struct powernow_k8_data *data,
-                struct cpufreq_frequency_table *powernow_table)
-{
-        int i;
-        u32 hi = 0, lo = 0;
-        rdmsr(MSR_PSTATE_CUR_LIMIT, lo, hi);
-        data->max_hw_pstate = (lo & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
-
-        for (i = 0; i < data->acpi_data.state_count; i++) {
-                u32 index;
-
-                index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
-                if (index > data->max_hw_pstate) {
-                        printk(KERN_ERR PFX "invalid pstate %d - "
-                                        "bad value %d.\n", i, index);
-                        printk(KERN_ERR PFX "Please report to BIOS "
-                                        "manufacturer\n");
-                        invalidate_entry(powernow_table, i);
-                        continue;
-                }
-
-                ps_to_as[index] = i;
-
-                /* Frequency may be rounded for these */
-                if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
-                                 || boot_cpu_data.x86 == 0x11) {
-
-                        rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
-                        if (!(hi & HW_PSTATE_VALID_MASK)) {
-                                pr_debug("invalid pstate %d, ignoring\n", index);
-                                invalidate_entry(powernow_table, i);
-                                continue;
-                        }
-
-                        powernow_table[i].frequency =
-                                freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
-                } else
-                        powernow_table[i].frequency =
-                                data->acpi_data.states[i].core_frequency * 1000;
-
-                powernow_table[i].index = index;
-        }
-        return 0;
-}
-
 static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
                 struct cpufreq_frequency_table *powernow_table)
 {
@@ -1036,15 +917,7 @@ static int get_transition_latency(struct powernow_k8_data *data)
                         max_latency = cur_latency;
         }
         if (max_latency == 0) {
-                /*
-                 * Fam 11h and later may return 0 as transition latency. This
-                 * is intended and means "very fast". While cpufreq core and
-                 * governors currently can handle that gracefully, better set it
-                 * to 1 to avoid problems in the future.
-                 */
-                if (boot_cpu_data.x86 < 0x11)
-                        printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
-                                "latency\n");
+                pr_err(FW_WARN PFX "Invalid zero transition latency\n");
                 max_latency = 1;
         }
         /* value in usecs, needs to be in nanoseconds */
@@ -1104,40 +977,6 @@ static int transition_frequency_fidvid(struct powernow_k8_data *data,
         return res;
 }
 
-/* Take a frequency, and issue the hardware pstate transition command */
-static int transition_frequency_pstate(struct powernow_k8_data *data,
-                unsigned int index)
-{
-        u32 pstate = 0;
-        int res, i;
-        struct cpufreq_freqs freqs;
-
-        pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
-
-        /* get MSR index for hardware pstate transition */
-        pstate = index & HW_PSTATE_MASK;
-        if (pstate > data->max_hw_pstate)
-                return -EINVAL;
-
-        freqs.old = find_khz_freq_from_pstate(data->powernow_table,
-                        data->currpstate);
-        freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
-
-        for_each_cpu(i, data->available_cores) {
-                freqs.cpu = i;
-                cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
-        }
-
-        res = transition_pstate(data, pstate);
-        freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
-
-        for_each_cpu(i, data->available_cores) {
-                freqs.cpu = i;
-                cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-        }
-        return res;
-}
-
 struct powernowk8_target_arg {
         struct cpufreq_policy           *pol;
         unsigned                        targfreq;
@@ -1173,18 +1012,15 @@ static long powernowk8_target_fn(void *arg)
         if (query_current_values_with_pending_wait(data))
                 return -EIO;
 
-        if (cpu_family != CPU_HW_PSTATE) {
-                pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
-                data->currfid, data->currvid);
+        pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
+                 data->currfid, data->currvid);
 
-                if ((checkvid != data->currvid) ||
-                    (checkfid != data->currfid)) {
-                        printk(KERN_INFO PFX
-                                "error - out of sync, fix 0x%x 0x%x, "
-                                "vid 0x%x 0x%x\n",
-                                checkfid, data->currfid,
-                                checkvid, data->currvid);
-                }
+        if ((checkvid != data->currvid) ||
+            (checkfid != data->currfid)) {
+                pr_info(PFX
+                       "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
+                       checkfid, data->currfid,
+                       checkvid, data->currvid);
         }
 
         if (cpufreq_frequency_table_target(pol, data->powernow_table,
@@ -1195,11 +1031,8 @@ static long powernowk8_target_fn(void *arg)
 
         powernow_k8_acpi_pst_values(data, newstate);
 
-        if (cpu_family == CPU_HW_PSTATE)
-                ret = transition_frequency_pstate(data,
-                        data->powernow_table[newstate].index);
-        else
-                ret = transition_frequency_fidvid(data, newstate);
+        ret = transition_frequency_fidvid(data, newstate);
+
         if (ret) {
                 printk(KERN_ERR PFX "transition frequency failed\n");
                 mutex_unlock(&fidvid_mutex);
@@ -1207,11 +1040,7 @@ static long powernowk8_target_fn(void *arg)
         }
         mutex_unlock(&fidvid_mutex);
 
-        if (cpu_family == CPU_HW_PSTATE)
-                pol->cur = find_khz_freq_from_pstate(data->powernow_table,
-                                data->powernow_table[newstate].index);
-        else
-                pol->cur = find_khz_freq_from_fid(data->currfid);
+        pol->cur = find_khz_freq_from_fid(data->currfid);
 
         return 0;
 }
@@ -1264,22 +1093,23 @@ static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
                 return;
         }
 
-        if (cpu_family == CPU_OPTERON)
-                fidvid_msr_init();
+        fidvid_msr_init();
 
         init_on_cpu->rc = 0;
 }
 
+static const char missing_pss_msg[] =
+        KERN_ERR
+        FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
+        FW_BUG PFX "First, make sure Cool'N'Quiet is enabled in the BIOS.\n"
+        FW_BUG PFX "If that doesn't help, try upgrading your BIOS.\n";
+
 /* per CPU init entry point to the driver */
 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 {
-        static const char ACPI_PSS_BIOS_BUG_MSG[] =
-                KERN_ERR FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
-                FW_BUG PFX "Try again with latest BIOS.\n";
         struct powernow_k8_data *data;
         struct init_on_cpu init_on_cpu;
         int rc;
-        struct cpuinfo_x86 *c = &cpu_data(pol->cpu);
 
         if (!cpu_online(pol->cpu))
                 return -ENODEV;
@@ -1295,7 +1125,6 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
         }
 
         data->cpu = pol->cpu;
-        data->currpstate = HW_PSTATE_INVALID;
 
         if (powernow_k8_cpu_init_acpi(data)) {
                 /*
@@ -1303,7 +1132,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
                  * an UP version, and is deprecated by AMD.
                  */
                 if (num_online_cpus() != 1) {
-                        printk_once(ACPI_PSS_BIOS_BUG_MSG);
+                        printk_once(missing_pss_msg);
                         goto err_out;
                 }
                 if (pol->cpu != 0) {
@@ -1332,17 +1161,10 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
         if (rc != 0)
                 goto err_out_exit_acpi;
 
-        if (cpu_family == CPU_HW_PSTATE)
-                cpumask_copy(pol->cpus, cpumask_of(pol->cpu));
-        else
-                cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
+        cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
         data->available_cores = pol->cpus;
 
-        if (cpu_family == CPU_HW_PSTATE)
-                pol->cur = find_khz_freq_from_pstate(data->powernow_table,
-                                data->currpstate);
-        else
-                pol->cur = find_khz_freq_from_fid(data->currfid);
+        pol->cur = find_khz_freq_from_fid(data->currfid);
         pr_debug("policy current frequency %d kHz\n", pol->cur);
 
         /* min/max the cpu is capable of */
@@ -1354,18 +1176,10 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
                 return -EINVAL;
         }
 
-        /* Check for APERF/MPERF support in hardware */
-        if (cpu_has(c, X86_FEATURE_APERFMPERF))
-                cpufreq_amd64_driver.getavg = cpufreq_get_measured_perf;
-
         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
 
-        if (cpu_family == CPU_HW_PSTATE)
-                pr_debug("cpu_init done, current pstate 0x%x\n",
-                                data->currpstate);
-        else
-                pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
-                        data->currfid, data->currvid);
+        pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
+                 data->currfid, data->currvid);
 
         per_cpu(powernow_data, pol->cpu) = data;
 
@@ -1418,88 +1232,15 @@ static unsigned int powernowk8_get(unsigned int cpu)
         if (err)
                 goto out;
 
-        if (cpu_family == CPU_HW_PSTATE)
-                khz = find_khz_freq_from_pstate(data->powernow_table,
-                                                data->currpstate);
-        else
-                khz = find_khz_freq_from_fid(data->currfid);
+        khz = find_khz_freq_from_fid(data->currfid);
 
 
 out:
         return khz;
 }
 
-static void _cpb_toggle_msrs(bool t)
-{
-        int cpu;
-
-        get_online_cpus();
-
-        rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
-
-        for_each_cpu(cpu, cpu_online_mask) {
-                struct msr *reg = per_cpu_ptr(msrs, cpu);
-                if (t)
-                        reg->l &= ~BIT(25);
-                else
-                        reg->l |= BIT(25);
-        }
-        wrmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
-
-        put_online_cpus();
-}
-
-/*
- * Switch on/off core performance boosting.
- *
- * 0=disable
- * 1=enable.
- */
-static void cpb_toggle(bool t)
-{
-        if (!cpb_capable)
-                return;
-
-        if (t && !cpb_enabled) {
-                cpb_enabled = true;
-                _cpb_toggle_msrs(t);
-                printk(KERN_INFO PFX "Core Boosting enabled.\n");
-        } else if (!t && cpb_enabled) {
-                cpb_enabled = false;
-                _cpb_toggle_msrs(t);
-                printk(KERN_INFO PFX "Core Boosting disabled.\n");
-        }
-}
-
-static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
-                                 size_t count)
-{
-        int ret = -EINVAL;
-        unsigned long val = 0;
-
-        ret = strict_strtoul(buf, 10, &val);
-        if (!ret && (val == 0 || val == 1) && cpb_capable)
-                cpb_toggle(val);
-        else
-                return -EINVAL;
-
-        return count;
-}
-
-static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
-{
-        return sprintf(buf, "%u\n", cpb_enabled);
-}
-
-#define define_one_rw(_name) \
-static struct freq_attr _name = \
-__ATTR(_name, 0644, show_##_name, store_##_name)
-
-define_one_rw(cpb);
-
 static struct freq_attr *powernow_k8_attr[] = {
         &cpufreq_freq_attr_scaling_available_freqs,
-        &cpb,
         NULL,
 };
 
@@ -1515,53 +1256,18 @@ static struct cpufreq_driver cpufreq_amd64_driver = {
         .attr           = powernow_k8_attr,
 };
 
-/*
- * Clear the boost-disable flag on the CPU_DOWN path so that this cpu
- * cannot block the remaining ones from boosting. On the CPU_UP path we
- * simply keep the boost-disable flag in sync with the current global
- * state.
- */
-static int cpb_notify(struct notifier_block *nb, unsigned long action,
-                      void *hcpu)
-{
-        unsigned cpu = (long)hcpu;
-        u32 lo, hi;
-
-        switch (action) {
-        case CPU_UP_PREPARE:
-        case CPU_UP_PREPARE_FROZEN:
-
-                if (!cpb_enabled) {
-                        rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
-                        lo |= BIT(25);
-                        wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi);
-                }
-                break;
-
-        case CPU_DOWN_PREPARE:
-        case CPU_DOWN_PREPARE_FROZEN:
-                rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
-                lo &= ~BIT(25);
-                wrmsr_on_cpu(cpu, MSR_K7_HWCR, lo, hi);
-                break;
-
-        default:
-                break;
-        }
-
-        return NOTIFY_OK;
-}
-
-static struct notifier_block cpb_nb = {
-        .notifier_call          = cpb_notify,
-};
-
 /* driver entry point for init */
 static int __cpuinit powernowk8_init(void)
 {
-        unsigned int i, supported_cpus = 0, cpu;
+        unsigned int i, supported_cpus = 0;
         int rv;
 
+        if (static_cpu_has(X86_FEATURE_HW_PSTATE)) {
+                pr_warn(PFX "this CPU is not supported anymore, using acpi-cpufreq instead.\n");
+                request_module("acpi-cpufreq");
+                return -ENODEV;
+        }
+
         if (!x86_match_cpu(powernow_k8_ids))
                 return -ENODEV;
 
@@ -1575,38 +1281,13 @@ static int __cpuinit powernowk8_init(void)
         if (supported_cpus != num_online_cpus())
                 return -ENODEV;
 
-        printk(KERN_INFO PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
-                num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
-
-        if (boot_cpu_has(X86_FEATURE_CPB)) {
-
-                cpb_capable = true;
-
-                msrs = msrs_alloc();
-                if (!msrs) {
-                        printk(KERN_ERR "%s: Error allocating msrs!\n", __func__);
-                        return -ENOMEM;
-                }
-
-                register_cpu_notifier(&cpb_nb);
-
-                rdmsr_on_cpus(cpu_online_mask, MSR_K7_HWCR, msrs);
+        rv = cpufreq_register_driver(&cpufreq_amd64_driver);
 
-                for_each_cpu(cpu, cpu_online_mask) {
-                        struct msr *reg = per_cpu_ptr(msrs, cpu);
-                        cpb_enabled |= !(!!(reg->l & BIT(25)));
-                }
+        if (!rv)
+                pr_info(PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
+                        num_online_nodes(), boot_cpu_data.x86_model_id,
+                        supported_cpus);
 
-                printk(KERN_INFO PFX "Core Performance Boosting: %s.\n",
-                        (cpb_enabled ? "on" : "off"));
-        }
-
-        rv = cpufreq_register_driver(&cpufreq_amd64_driver);
-        if (rv < 0 && boot_cpu_has(X86_FEATURE_CPB)) {
-                unregister_cpu_notifier(&cpb_nb);
-                msrs_free(msrs);
-                msrs = NULL;
-        }
         return rv;
 }
 
@@ -1615,13 +1296,6 @@ static void __exit powernowk8_exit(void)
 {
         pr_debug("exit\n");
 
-        if (boot_cpu_has(X86_FEATURE_CPB)) {
-                msrs_free(msrs);
-                msrs = NULL;
-
-                unregister_cpu_notifier(&cpb_nb);
-        }
-
         cpufreq_unregister_driver(&cpufreq_amd64_driver);
 }