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| 1 | +/* |
| 2 | + * Copyright © 2012 Intel Corporation |
| 3 | + * |
| 4 | + * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | + * copy of this software and associated documentation files (the "Software"), |
| 6 | + * to deal in the Software without restriction, including without limitation |
| 7 | + * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | + * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | + * Software is furnished to do so, subject to the following conditions: |
| 10 | + * |
| 11 | + * The above copyright notice and this permission notice (including the next |
| 12 | + * paragraph) shall be included in all copies or substantial portions of the |
| 13 | + * Software. |
| 14 | + * |
| 15 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 21 | + * IN THE SOFTWARE. |
| 22 | + * |
| 23 | + * Authors: |
| 24 | + * Ben Widawsky <ben@bwidawsk.net> |
| 25 | + * |
| 26 | + */ |
| 27 | + |
| 28 | +#include <linux/device.h> |
| 29 | +#include <linux/module.h> |
| 30 | +#include <linux/stat.h> |
| 31 | +#include <linux/sysfs.h> |
| 32 | +#include "i915_drv.h" |
| 33 | + |
| 34 | +static u32 calc_residency(struct drm_device *dev, const u32 reg) |
| 35 | +{ |
| 36 | + struct drm_i915_private *dev_priv = dev->dev_private; |
| 37 | + u64 raw_time; /* 32b value may overflow during fixed point math */ |
| 38 | + |
| 39 | + if (!intel_enable_rc6(dev)) |
| 40 | + return 0; |
| 41 | + |
| 42 | + raw_time = I915_READ(reg) * 128ULL + 500; |
| 43 | + return do_div(raw_time, 100000); |
| 44 | +} |
| 45 | + |
| 46 | +static ssize_t |
| 47 | +show_rc6_mask(struct device *dev, struct device_attribute *attr, char *buf) |
| 48 | +{ |
| 49 | + struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); |
| 50 | + return snprintf(buf, PAGE_SIZE, "%x", intel_enable_rc6(dminor->dev)); |
| 51 | +} |
| 52 | + |
| 53 | +static ssize_t |
| 54 | +show_rc6_ms(struct device *dev, struct device_attribute *attr, char *buf) |
| 55 | +{ |
| 56 | + struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); |
| 57 | + u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6); |
| 58 | + return snprintf(buf, PAGE_SIZE, "%u", rc6_residency); |
| 59 | +} |
| 60 | + |
| 61 | +static ssize_t |
| 62 | +show_rc6p_ms(struct device *dev, struct device_attribute *attr, char *buf) |
| 63 | +{ |
| 64 | + struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); |
| 65 | + u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p); |
| 66 | + return snprintf(buf, PAGE_SIZE, "%u", rc6p_residency); |
| 67 | +} |
| 68 | + |
| 69 | +static ssize_t |
| 70 | +show_rc6pp_ms(struct device *dev, struct device_attribute *attr, char *buf) |
| 71 | +{ |
| 72 | + struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); |
| 73 | + u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp); |
| 74 | + return snprintf(buf, PAGE_SIZE, "%u", rc6pp_residency); |
| 75 | +} |
| 76 | + |
| 77 | +static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL); |
| 78 | +static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL); |
| 79 | +static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL); |
| 80 | +static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL); |
| 81 | + |
| 82 | +static struct attribute *rc6_attrs[] = { |
| 83 | + &dev_attr_rc6_enable.attr, |
| 84 | + &dev_attr_rc6_residency_ms.attr, |
| 85 | + &dev_attr_rc6p_residency_ms.attr, |
| 86 | + &dev_attr_rc6pp_residency_ms.attr, |
| 87 | + NULL |
| 88 | +}; |
| 89 | + |
| 90 | +static struct attribute_group rc6_attr_group = { |
| 91 | + .name = power_group_name, |
| 92 | + .attrs = rc6_attrs |
| 93 | +}; |
| 94 | + |
| 95 | +void i915_setup_sysfs(struct drm_device *dev) |
| 96 | +{ |
| 97 | + int ret; |
| 98 | + |
| 99 | + /* ILK doesn't have any residency information */ |
| 100 | + if (INTEL_INFO(dev)->gen < 6) |
| 101 | + return; |
| 102 | + |
| 103 | + ret = sysfs_merge_group(&dev->primary->kdev.kobj, &rc6_attr_group); |
| 104 | + if (ret) |
| 105 | + DRM_ERROR("sysfs setup failed\n"); |
| 106 | +} |
| 107 | + |
| 108 | +void i915_teardown_sysfs(struct drm_device *dev) |
| 109 | +{ |
| 110 | + sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group); |
| 111 | +} |
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