drm/i915: Expose energy counter on SNB+ through debugfs

On SNB and IVB, there's an MSR (also exposed through MCHBAR) we can use
to read out the amount of energy used over time.  Expose this in sysfs
to make it easy to do power comparisons with different configurations.

If the platform supports it, the file will show up under the
drm/card0/power subdirectory of the PCI device in sysfs as gt_energy_uJ.
The value in the file is a running total of energy (in microjoules)
consumed by the graphics device.

v2: move to sysfs (Ben, Daniel)
    expose a simple value (Chris)
    drop unrelated hunk (Ben)

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

v3: by Ben
Tied it into existing rc6  sysfs entries and named that a more generic
"power attrs." Fixed rebase conflicts.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

v4: Since RAPL is a real driver that already exists to serve power
monitoring, place our entry in debugfs. This gives me a fallback
location for systems that do not expose it otherwise.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 4785d8c14654..236d97e51c3a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -31,6 +31,7 @@
 #include <linux/slab.h>
 #include <linux/export.h>
 #include <linux/list_sort.h>
+#include <asm/msr-index.h>
 #include <drm/drmP.h>
 #include "intel_drv.h"
 #include "intel_ringbuffer.h"
@@ -1769,6 +1770,27 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
         return 0;
 }
 
+static int i915_energy_uJ(struct seq_file *m, void *data)
+{
+        struct drm_info_node *node = m->private;
+        struct drm_device *dev = node->minor->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        u64 power;
+        u32 units;
+
+        if (INTEL_INFO(dev)->gen < 6)
+                return -ENODEV;
+
+        rdmsrl(MSR_RAPL_POWER_UNIT, power);
+        power = (power & 0x1f00) >> 8;
+        units = 1000000 / (1 << power); /* convert to uJ */
+        power = I915_READ(MCH_SECP_NRG_STTS);
+        power *= units;
+
+        seq_printf(m, "%llu", (long long unsigned)power);
+        return 0;
+}
+
 static int
 i915_wedged_get(void *data, u64 *val)
 {
@@ -2208,6 +2230,7 @@ static struct drm_info_list i915_debugfs_list[] = {
         {"i915_dpio", i915_dpio_info, 0},
         {"i915_llc", i915_llc, 0},
         {"i915_edp_psr_status", i915_edp_psr_status, 0},
+        {"i915_energy_uJ", i915_energy_uJ, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)