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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
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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,
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20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 #include <linux/debugfs.h>
24 #include <linux/list_sort.h>
28 struct mmio_diff_param {
29 struct intel_vgpu *vgpu;
32 struct list_head diff_mmio_list;
36 struct list_head node;
42 /* Compare two diff_mmio items. */
43 static int mmio_offset_compare(void *priv,
44 struct list_head *a, struct list_head *b)
49 ma = container_of(a, struct diff_mmio, node);
50 mb = container_of(b, struct diff_mmio, node);
51 if (ma->offset < mb->offset)
53 else if (ma->offset > mb->offset)
58 static inline int mmio_diff_handler(struct intel_gvt *gvt,
59 u32 offset, void *data)
61 struct drm_i915_private *dev_priv = gvt->dev_priv;
62 struct mmio_diff_param *param = data;
63 struct diff_mmio *node;
66 preg = I915_READ_NOTRACE(_MMIO(offset));
67 vreg = vgpu_vreg(param->vgpu, offset);
70 node = kmalloc(sizeof(*node), GFP_KERNEL);
74 node->offset = offset;
77 list_add(&node->node, ¶m->diff_mmio_list);
84 /* Show the all the different values of tracked mmio. */
85 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
87 struct intel_vgpu *vgpu = s->private;
88 struct intel_gvt *gvt = vgpu->gvt;
89 struct mmio_diff_param param = {
94 struct diff_mmio *node, *next;
96 INIT_LIST_HEAD(¶m.diff_mmio_list);
98 mutex_lock(&gvt->lock);
99 spin_lock_bh(&gvt->scheduler.mmio_context_lock);
101 mmio_hw_access_pre(gvt->dev_priv);
102 /* Recognize all the diff mmios to list. */
103 intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, ¶m);
104 mmio_hw_access_post(gvt->dev_priv);
106 spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
107 mutex_unlock(&gvt->lock);
109 /* In an ascending order by mmio offset. */
110 list_sort(NULL, ¶m.diff_mmio_list, mmio_offset_compare);
112 seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
113 list_for_each_entry_safe(node, next, ¶m.diff_mmio_list, node) {
114 u32 diff = node->preg ^ node->vreg;
116 seq_printf(s, "%08x %08x %08x %*pbl\n",
117 node->offset, node->preg, node->vreg,
119 list_del(&node->node);
122 seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
126 static int vgpu_mmio_diff_open(struct inode *inode, struct file *file)
128 return single_open(file, vgpu_mmio_diff_show, inode->i_private);
131 static const struct file_operations vgpu_mmio_diff_fops = {
132 .open = vgpu_mmio_diff_open,
135 .release = single_release,
139 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
143 * Zero on success, negative error code if failed.
145 int intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
150 sprintf(name, "vgpu%d", vgpu->id);
151 vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
155 ent = debugfs_create_bool("active", 0444, vgpu->debugfs,
160 ent = debugfs_create_file("mmio_diff", 0444, vgpu->debugfs,
161 vgpu, &vgpu_mmio_diff_fops);
169 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
172 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
174 debugfs_remove_recursive(vgpu->debugfs);
175 vgpu->debugfs = NULL;
179 * intel_gvt_debugfs_init - register gvt debugfs root entry
183 * zero on success, negative if failed.
185 int intel_gvt_debugfs_init(struct intel_gvt *gvt)
187 struct drm_minor *minor = gvt->dev_priv->drm.primary;
190 gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
191 if (!gvt->debugfs_root) {
192 gvt_err("Cannot create debugfs dir\n");
196 ent = debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
197 &gvt->mmio.num_tracked_mmio);
205 * intel_gvt_debugfs_clean - remove debugfs entries
208 void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
210 debugfs_remove_recursive(gvt->debugfs_root);
211 gvt->debugfs_root = NULL;