powernv-cpufreq: Add helper to extract pstate from PMSR

On POWERNV platform, the fields for pstates in the Power Management
Status Register (PMSR) and the Power Management Control Register
(PMCR) are 8-bits wide. On POWER8 the pstates are negatively numbered
while on POWER9 they are positively numbered.

The device-tree exports pstates as 32-bit entries. The device-tree
implementation sign-extends the 8-bit pstate values to obtain the
corresponding 32-bit entry.

Eg: On POWER8, a pstate value 0x82 [-126] is represented in the
device-tree as 0xfffffff82 while on POWER9, the same value 0x82 [130]
is represented in the device-tree as 0x00000082.

The powernv-cpufreq driver implementation represents pstates using the
integer type. In multiple places in the driver, the code interprets
the pstates extracted from the PMSR as a signed byte and assigns it to
a integer variable to get the sign-extention.

On POWER9 platforms which have greater than 128 pstates, this results
in the driver performing incorrect sign-extention, and thereby
treating a legitimate pstate (say 130) as an invalid pstates (since it
is interpreted as -126).

This patch fixes the issue by implementing a helper function to
extract Pstates from PMSR register, and correctly sign-extend it to be
consistent with the values provided by the device-tree.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index b6d7c4c98d0ab67a3d141c0cc8360d722863d388..f46b60fb308474984daa8b8b6031d9a9bc435151 100644 (file)
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -41,11 +41,9 @@
 #define POWERNV_MAX_PSTATES    256
 #define PMSR_PSAFE_ENABLE      (1UL << 30)
 #define PMSR_SPR_EM_DISABLE    (1UL << 31)
-#define PMSR_MAX(x)            ((x >> 32) & 0xFF)
+#define MAX_PSTATE_SHIFT       32
 #define LPSTATE_SHIFT          48
 #define GPSTATE_SHIFT          56
-#define GET_LPSTATE(x)         (((x) >> LPSTATE_SHIFT) & 0xFF)
-#define GET_GPSTATE(x)         (((x) >> GPSTATE_SHIFT) & 0xFF)
 
 #define MAX_RAMP_DOWN_TIME                             5120
 /*
@@ -94,6 +92,7 @@ struct global_pstate_info {
 };
 
 static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
+u32 pstate_sign_prefix;
 static bool rebooting, throttled, occ_reset;
 
 static const char * const throttle_reason[] = {
@@ -148,6 +147,20 @@ static struct powernv_pstate_info {
        bool wof_enabled;
 } powernv_pstate_info;
 
+static inline int extract_pstate(u64 pmsr_val, unsigned int shift)
+{
+       int ret = ((pmsr_val >> shift) & 0xFF);
+
+       if (!ret)
+               return ret;
+
+       return (pstate_sign_prefix | ret);
+}
+
+#define extract_local_pstate(x) extract_pstate(x, LPSTATE_SHIFT)
+#define extract_global_pstate(x) extract_pstate(x, GPSTATE_SHIFT)
+#define extract_max_pstate(x)  extract_pstate(x, MAX_PSTATE_SHIFT)
+
 /* Use following macros for conversions between pstate_id and index */
 static inline int idx_to_pstate(unsigned int i)
 {
@@ -278,6 +291,9 @@ next:
 
        powernv_pstate_info.nr_pstates = nr_pstates;
        pr_debug("NR PStates %d\n", nr_pstates);
+
+       pstate_sign_prefix = pstate_min & ~0xFF;
+
        for (i = 0; i < nr_pstates; i++) {
                u32 id = be32_to_cpu(pstate_ids[i]);
                u32 freq = be32_to_cpu(pstate_freqs[i]);
@@ -438,17 +454,10 @@ struct powernv_smp_call_data {
 static void powernv_read_cpu_freq(void *arg)
 {
        unsigned long pmspr_val;
-       s8 local_pstate_id;
        struct powernv_smp_call_data *freq_data = arg;
 
        pmspr_val = get_pmspr(SPRN_PMSR);
-
-       /*
-        * The local pstate id corresponds bits 48..55 in the PMSR.
-        * Note: Watch out for the sign!
-        */
-       local_pstate_id = (pmspr_val >> 48) & 0xFF;
-       freq_data->pstate_id = local_pstate_id;
+       freq_data->pstate_id = extract_local_pstate(pmspr_val);
        freq_data->freq = pstate_id_to_freq(freq_data->pstate_id);
 
        pr_debug("cpu %d pmsr %016lX pstate_id %d frequency %d kHz\n",
@@ -522,7 +531,7 @@ static void powernv_cpufreq_throttle_check(void *data)
        chip = this_cpu_read(chip_info);
 
        /* Check for Pmax Capping */
-       pmsr_pmax = (s8)PMSR_MAX(pmsr);
+       pmsr_pmax = extract_max_pstate(pmsr);
        pmsr_pmax_idx = pstate_to_idx(pmsr_pmax);
        if (pmsr_pmax_idx != powernv_pstate_info.max) {
                if (chip->throttled)
@@ -645,8 +654,8 @@ void gpstate_timer_handler(struct timer_list *t)
         * value. Hence, read from PMCR to get correct data.
         */
        val = get_pmspr(SPRN_PMCR);
-       freq_data.gpstate_id = (s8)GET_GPSTATE(val);
-       freq_data.pstate_id = (s8)GET_LPSTATE(val);
+       freq_data.gpstate_id = extract_global_pstate(val);
+       freq_data.pstate_id = extract_local_pstate(val);
        if (freq_data.gpstate_id  == freq_data.pstate_id) {
                reset_gpstates(policy);
                spin_unlock(&gpstates->gpstate_lock);