tile: support reporting Tilera hypervisor statistics

Newer hypervisors have an API for reporting per-cpu statistics
information.  This change allows seeing that information via
/sys/devices/system/cpu/cpuN/hv_stats file for each core.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

2 files changed, 89 insertions, 3 deletions

diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h
index 0971ebbde1b7..dfcdeb61ba34 100644
--- a/arch/tile/include/hv/hypervisor.h
+++ b/arch/tile/include/hv/hypervisor.h
@@ -544,14 +544,24 @@ typedef enum {
   HV_CONFSTR_CPUMOD_REV      = 18,
 
   /** Human-readable CPU module description. */
-  HV_CONFSTR_CPUMOD_DESC     = 19
+  HV_CONFSTR_CPUMOD_DESC     = 19,
+
+  /** Per-tile hypervisor statistics.  When this identifier is specified,
+   *  the hv_confstr call takes two extra arguments.  The first is the
+   *  HV_XY_TO_LOTAR of the target tile's coordinates.  The second is
+   *  a flag word.  The only current flag is the lowest bit, which means
+   *  "zero out the stats instead of retrieving them"; in this case the
+   *  buffer and buffer length are ignored. */
+  HV_CONFSTR_HV_STATS        = 20
 
 } HV_ConfstrQuery;
 
 /** Query a configuration string from the hypervisor.
  *
  * @param query Identifier for the specific string to be retrieved
- *        (HV_CONFSTR_xxx).
+ *        (HV_CONFSTR_xxx).  Some strings may require or permit extra
+ *        arguments to be appended which select specific objects to be
+ *        described; see the string descriptions above.
  * @param buf Buffer in which to place the string.
  * @param len Length of the buffer.
  * @return If query is valid, then the length of the corresponding string,
@@ -559,7 +569,7 @@ typedef enum {
  *        was truncated.  If query is invalid, HV_EINVAL.  If the specified
  *        buffer is not writable by the client, HV_EFAULT.
  */
-int hv_confstr(HV_ConfstrQuery query, HV_VirtAddr buf, int len);
+int hv_confstr(HV_ConfstrQuery query, HV_VirtAddr buf, int len, ...);
 
 /** Tile coordinate */
 typedef struct
diff --git a/arch/tile/kernel/sysfs.c b/arch/tile/kernel/sysfs.c
index e25b0a89c18f..a3ed12f8f83b 100644
--- a/arch/tile/kernel/sysfs.c
+++ b/arch/tile/kernel/sysfs.c
@@ -157,6 +157,67 @@ hvconfig_bin_read(struct file *filp, struct kobject *kobj,
         return count;
 }
 
+static ssize_t hv_stats_show(struct device *dev,
+                             struct device_attribute *attr,
+                             char *page)
+{
+        int cpu = dev->id;
+        long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
+
+        ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS,
+                               (unsigned long)page, PAGE_SIZE - 1,
+                               lotar, 0);
+        n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1);
+        page[n] = '\0';
+        return n;
+}
+
+static ssize_t hv_stats_store(struct device *dev,
+                              struct device_attribute *attr,
+                              const char *page,
+                              size_t count)
+{
+        int cpu = dev->id;
+        long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
+
+        ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS, 0, 0, lotar, 1);
+        return n < 0 ? n : count;
+}
+
+static DEVICE_ATTR(hv_stats, 0644, hv_stats_show, hv_stats_store);
+
+static int hv_stats_device_add(struct device *dev, struct subsys_interface *sif)
+{
+        int err, cpu = dev->id;
+
+        if (!cpu_online(cpu))
+                return 0;
+
+        err = sysfs_create_file(&dev->kobj, &dev_attr_hv_stats.attr);
+
+        return err;
+}
+
+static int hv_stats_device_remove(struct device *dev,
+                                  struct subsys_interface *sif)
+{
+        int cpu = dev->id;
+
+        if (!cpu_online(cpu))
+                return 0;
+
+        sysfs_remove_file(&dev->kobj, &dev_attr_hv_stats.attr);
+        return 0;
+}
+
+
+static struct subsys_interface hv_stats_interface = {
+        .name                   = "hv_stats",
+        .subsys                 = &cpu_subsys,
+        .add_dev                = hv_stats_device_add,
+        .remove_dev             = hv_stats_device_remove,
+};
+
 static int __init create_sysfs_entries(void)
 {
         int err = 0;
@@ -188,6 +249,21 @@ static int __init create_sysfs_entries(void)
                 err = sysfs_create_bin_file(hypervisor_kobj, &hvconfig_bin);
         }
 
+        if (!err) {
+                /*
+                 * Don't bother adding the hv_stats files on each CPU if
+                 * our hypervisor doesn't supply statistics.
+                 */
+                int cpu = raw_smp_processor_id();
+                long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
+                char dummy;
+                ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS,
+                                       (unsigned long) &dummy, 1,
+                                       lotar, 0);
+                if (n >= 0)
+                        err = subsys_interface_register(&hv_stats_interface);
+        }
+
         return err;
 }
 subsys_initcall(create_sysfs_entries);