i915/gvt/debugfs.c

0001 /*
0002  * Copyright(c) 2011-2017 Intel Corporation. All rights reserved.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice (including the next
0012  * paragraph) shall be included in all copies or substantial portions of the
0013  * Software.
0014  *
0015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0016  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0017  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0018  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0019  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0020  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0021  * SOFTWARE.
0022  */
0023 #include <linux/debugfs.h>
0024 #include <linux/list_sort.h>
0025 #include "i915_drv.h"
0026 #include "gvt.h"
0027
0028 struct mmio_diff_param {
0029     struct intel_vgpu *vgpu;
0030     int total;
0031     int diff;
0032     struct list_head diff_mmio_list;
0033 };
0034
0035 struct diff_mmio {
0036     struct list_head node;
0037     u32 offset;
0038     u32 preg;
0039     u32 vreg;
0040 };
0041
0042 /* Compare two diff_mmio items. */
0043 static int mmio_offset_compare(void *priv,
0044     const struct list_head *a, const struct list_head *b)
0045 {
0046     struct diff_mmio *ma;
0047     struct diff_mmio *mb;
0048
0049     ma = container_of(a, struct diff_mmio, node);
0050     mb = container_of(b, struct diff_mmio, node);
0051     if (ma->offset < mb->offset)
0052         return -1;
0053     else if (ma->offset > mb->offset)
0054         return 1;
0055     return 0;
0056 }
0057
0058 static inline int mmio_diff_handler(struct intel_gvt *gvt,
0059                     u32 offset, void *data)
0060 {
0061     struct mmio_diff_param *param = data;
0062     struct diff_mmio *node;
0063     u32 preg, vreg;
0064
0065     preg = intel_uncore_read_notrace(gvt->gt->uncore, _MMIO(offset));
0066     vreg = vgpu_vreg(param->vgpu, offset);
0067
0068     if (preg != vreg) {
0069         node = kmalloc(sizeof(*node), GFP_ATOMIC);
0070         if (!node)
0071             return -ENOMEM;
0072
0073         node->offset = offset;
0074         node->preg = preg;
0075         node->vreg = vreg;
0076         list_add(&node->node, &param->diff_mmio_list);
0077         param->diff++;
0078     }
0079     param->total++;
0080     return 0;
0081 }
0082
0083 /* Show the all the different values of tracked mmio. */
0084 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
0085 {
0086     struct intel_vgpu *vgpu = s->private;
0087     struct intel_gvt *gvt = vgpu->gvt;
0088     struct mmio_diff_param param = {
0089         .vgpu = vgpu,
0090         .total = 0,
0091         .diff = 0,
0092     };
0093     struct diff_mmio *node, *next;
0094
0095     INIT_LIST_HEAD(&param.diff_mmio_list);
0096
0097     mutex_lock(&gvt->lock);
0098     spin_lock_bh(&gvt->scheduler.mmio_context_lock);
0099
0100     mmio_hw_access_pre(gvt->gt);
0101     /* Recognize all the diff mmios to list. */
0102     intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, &param);
0103     mmio_hw_access_post(gvt->gt);
0104
0105     spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
0106     mutex_unlock(&gvt->lock);
0107
0108     /* In an ascending order by mmio offset. */
0109     list_sort(NULL, &param.diff_mmio_list, mmio_offset_compare);
0110
0111     seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
0112     list_for_each_entry_safe(node, next, &param.diff_mmio_list, node) {
0113         u32 diff = node->preg ^ node->vreg;
0114
0115         seq_printf(s, "%08x %08x %08x %*pbl\n",
0116                node->offset, node->preg, node->vreg,
0117                32, &diff);
0118         list_del(&node->node);
0119         kfree(node);
0120     }
0121     seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
0122     return 0;
0123 }
0124 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
0125
0126 static int
0127 vgpu_scan_nonprivbb_get(void *data, u64 *val)
0128 {
0129     struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
0130
0131     *val = vgpu->scan_nonprivbb;
0132     return 0;
0133 }
0134
0135 /*
0136  * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
0137  * of non-privileged batch buffer. e.g.
0138  * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
0139  * on engine 0 and 1.
0140  */
0141 static int
0142 vgpu_scan_nonprivbb_set(void *data, u64 val)
0143 {
0144     struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
0145
0146     vgpu->scan_nonprivbb = val;
0147     return 0;
0148 }
0149
0150 DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
0151             vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
0152             "0x%llx\n");
0153
0154 /**
0155  * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
0156  * @vgpu: a vGPU
0157  */
0158 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
0159 {
0160     char name[16] = "";
0161
0162     snprintf(name, 16, "vgpu%d", vgpu->id);
0163     vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
0164
0165     debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
0166     debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
0167                 &vgpu_mmio_diff_fops);
0168     debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
0169                 &vgpu_scan_nonprivbb_fops);
0170 }
0171
0172 /**
0173  * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
0174  * @vgpu: a vGPU
0175  */
0176 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
0177 {
0178     debugfs_remove_recursive(vgpu->debugfs);
0179     vgpu->debugfs = NULL;
0180 }
0181
0182 /**
0183  * intel_gvt_debugfs_init - register gvt debugfs root entry
0184  * @gvt: GVT device
0185  */
0186 void intel_gvt_debugfs_init(struct intel_gvt *gvt)
0187 {
0188     struct drm_minor *minor = gvt->gt->i915->drm.primary;
0189
0190     gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
0191
0192     debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
0193                  &gvt->mmio.num_tracked_mmio);
0194 }
0195
0196 /**
0197  * intel_gvt_debugfs_clean - remove debugfs entries
0198  * @gvt: GVT device
0199  */
0200 void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
0201 {
0202     debugfs_remove_recursive(gvt->debugfs_root);
0203     gvt->debugfs_root = NULL;
0204 }