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
 33#include "gt/intel_gt_regs.h"
 34#include "gt/intel_rc6.h"
 35#include "gt/intel_rps.h"
 36#include "gt/sysfs_engines.h"
 37
 38#include "i915_drv.h"
 39#include "i915_sysfs.h"
 40
 41struct drm_i915_private *kdev_minor_to_i915(struct device *kdev)
 42{
 43	struct drm_minor *minor = dev_get_drvdata(kdev);
 44	return to_i915(minor->dev);
 45}
 46
 47static int l3_access_valid(struct drm_i915_private *i915, loff_t offset)
 48{
 49	if (!HAS_L3_DPF(i915))
 50		return -EPERM;
 51
 52	if (!IS_ALIGNED(offset, sizeof(u32)))
 53		return -EINVAL;
 54
 55	if (offset >= GEN7_L3LOG_SIZE)
 56		return -ENXIO;
 57
 58	return 0;
 59}
 60
 61static ssize_t
 62i915_l3_read(struct file *filp, struct kobject *kobj,
 63	     struct bin_attribute *attr, char *buf,
 64	     loff_t offset, size_t count)
 65{
 66	struct device *kdev = kobj_to_dev(kobj);
 67	struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
 68	int slice = (int)(uintptr_t)attr->private;
 69	int ret;
 70
 71	ret = l3_access_valid(i915, offset);
 72	if (ret)
 73		return ret;
 74
 75	count = round_down(count, sizeof(u32));
 76	count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count);
 77	memset(buf, 0, count);
 78
 79	spin_lock(&i915->gem.contexts.lock);
 80	if (i915->l3_parity.remap_info[slice])
 81		memcpy(buf,
 82		       i915->l3_parity.remap_info[slice] + offset / sizeof(u32),
 83		       count);
 84	spin_unlock(&i915->gem.contexts.lock);
 85
 86	return count;
 87}
 88
 89static ssize_t
 90i915_l3_write(struct file *filp, struct kobject *kobj,
 91	      struct bin_attribute *attr, char *buf,
 92	      loff_t offset, size_t count)
 93{
 94	struct device *kdev = kobj_to_dev(kobj);
 95	struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
 96	int slice = (int)(uintptr_t)attr->private;
 97	u32 *remap_info, *freeme = NULL;
 98	struct i915_gem_context *ctx;
 99	int ret;
100
101	ret = l3_access_valid(i915, offset);
102	if (ret)
103		return ret;
104
105	if (count < sizeof(u32))
106		return -EINVAL;
107
108	remap_info = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
109	if (!remap_info)
110		return -ENOMEM;
111
112	spin_lock(&i915->gem.contexts.lock);
113
114	if (i915->l3_parity.remap_info[slice]) {
115		freeme = remap_info;
116		remap_info = i915->l3_parity.remap_info[slice];
117	} else {
118		i915->l3_parity.remap_info[slice] = remap_info;
119	}
120
121	count = round_down(count, sizeof(u32));
122	memcpy(remap_info + offset / sizeof(u32), buf, count);
123
124	/* NB: We defer the remapping until we switch to the context */
125	list_for_each_entry(ctx, &i915->gem.contexts.list, link)
126		ctx->remap_slice |= BIT(slice);
127
128	spin_unlock(&i915->gem.contexts.lock);
129	kfree(freeme);
130
131	/*
132	 * TODO: Ideally we really want a GPU reset here to make sure errors
133	 * aren't propagated. Since I cannot find a stable way to reset the GPU
134	 * at this point it is left as a TODO.
135	*/
136
137	return count;
138}
139
140static const struct bin_attribute dpf_attrs = {
141	.attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
142	.size = GEN7_L3LOG_SIZE,
143	.read = i915_l3_read,
144	.write = i915_l3_write,
145	.mmap = NULL,
146	.private = (void *)0
147};
148
149static const struct bin_attribute dpf_attrs_1 = {
150	.attr = {.name = "l3_parity_slice_1", .mode = (S_IRUSR | S_IWUSR)},
151	.size = GEN7_L3LOG_SIZE,
152	.read = i915_l3_read,
153	.write = i915_l3_write,
154	.mmap = NULL,
155	.private = (void *)1
156};
157
158void i915_setup_sysfs(struct drm_i915_private *dev_priv)
159{
160	struct device *kdev = dev_priv->drm.primary->kdev;
161	int ret;
162
163	if (HAS_L3_DPF(dev_priv)) {
164		ret = device_create_bin_file(kdev, &dpf_attrs);
165		if (ret)
166			drm_err(&dev_priv->drm,
167				"l3 parity sysfs setup failed\n");
168
169		if (NUM_L3_SLICES(dev_priv) > 1) {
170			ret = device_create_bin_file(kdev,
171						     &dpf_attrs_1);
172			if (ret)
173				drm_err(&dev_priv->drm,
174					"l3 parity slice 1 setup failed\n");
175		}
176	}
177
178	dev_priv->sysfs_gt = kobject_create_and_add("gt", &kdev->kobj);
179	if (!dev_priv->sysfs_gt)
180		drm_warn(&dev_priv->drm,
181			 "failed to register GT sysfs directory\n");
182
183	i915_gpu_error_sysfs_setup(dev_priv);
184
185	intel_engines_add_sysfs(dev_priv);
186}
187
188void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
189{
190	struct device *kdev = dev_priv->drm.primary->kdev;
191
192	i915_gpu_error_sysfs_teardown(dev_priv);
193
194	device_remove_bin_file(kdev, &dpf_attrs_1);
195	device_remove_bin_file(kdev, &dpf_attrs);
196
197	kobject_put(dev_priv->sysfs_gt);
198}