LXR linux/drivers/gpu/drm/i915/gvt/debugfs.c

   1/*
   2 * Copyright(c) 2011-2017 Intel Corporation. All rights reserved.
   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 FROM,
  20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21 * SOFTWARE.
  22 */
  23#include <linux/debugfs.h>
  24#include <linux/list_sort.h>
  25#include "i915_drv.h"
  26#include "gvt.h"
  27
  28struct mmio_diff_param {
  29        struct intel_vgpu *vgpu;
  30        int total;
  31        int diff;
  32        struct list_head diff_mmio_list;
  33};
  34
  35struct diff_mmio {
  36        struct list_head node;
  37        u32 offset;
  38        u32 preg;
  39        u32 vreg;
  40};
  41
  42/* Compare two diff_mmio items. */
  43static int mmio_offset_compare(void *priv,
  44        const struct list_head *a, const struct list_head *b)
  45{
  46        struct diff_mmio *ma;
  47        struct diff_mmio *mb;
  48
  49        ma = container_of(a, struct diff_mmio, node);
  50        mb = container_of(b, struct diff_mmio, node);
  51        if (ma->offset < mb->offset)
  52                return -1;
  53        else if (ma->offset > mb->offset)
  54                return 1;
  55        return 0;
  56}
  57
  58static inline int mmio_diff_handler(struct intel_gvt *gvt,
  59                                    u32 offset, void *data)
  60{
  61        struct mmio_diff_param *param = data;
  62        struct diff_mmio *node;
  63        u32 preg, vreg;
  64
  65        preg = intel_uncore_read_notrace(gvt->gt->uncore, _MMIO(offset));
  66        vreg = vgpu_vreg(param->vgpu, offset);
  67
  68        if (preg != vreg) {
  69                node = kmalloc(sizeof(*node), GFP_ATOMIC);
  70                if (!node)
  71                        return -ENOMEM;
  72
  73                node->offset = offset;
  74                node->preg = preg;
  75                node->vreg = vreg;
  76                list_add(&node->node, &param->diff_mmio_list);
  77                param->diff++;
  78        }
  79        param->total++;
  80        return 0;
  81}
  82
  83/* Show the all the different values of tracked mmio. */
  84static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
  85{
  86        struct intel_vgpu *vgpu = s->private;
  87        struct intel_gvt *gvt = vgpu->gvt;
  88        struct mmio_diff_param param = {
  89                .vgpu = vgpu,
  90                .total = 0,
  91                .diff = 0,
  92        };
  93        struct diff_mmio *node, *next;
  94
  95        INIT_LIST_HEAD(&param.diff_mmio_list);
  96
  97        mutex_lock(&gvt->lock);
  98        spin_lock_bh(&gvt->scheduler.mmio_context_lock);
  99
 100        mmio_hw_access_pre(gvt->gt);
 101        /* Recognize all the diff mmios to list. */
 102        intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, &param);
 103        mmio_hw_access_post(gvt->gt);
 104
 105        spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
 106        mutex_unlock(&gvt->lock);
 107
 108        /* In an ascending order by mmio offset. */
 109        list_sort(NULL, &param.diff_mmio_list, mmio_offset_compare);
 110
 111        seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
 112        list_for_each_entry_safe(node, next, &param.diff_mmio_list, node) {
 113                u32 diff = node->preg ^ node->vreg;
 114
 115                seq_printf(s, "%08x %08x %08x %*pbl\n",
 116                           node->offset, node->preg, node->vreg,
 117                           32, &diff);
 118                list_del(&node->node);
 119                kfree(node);
 120        }
 121        seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
 122        return 0;
 123}
 124DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
 125
 126static int
 127vgpu_scan_nonprivbb_get(void *data, u64 *val)
 128{
 129        struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
 130
 131        *val = vgpu->scan_nonprivbb;
 132        return 0;
 133}
 134
 135/*
 136 * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
 137 * of non-privileged batch buffer. e.g.
 138 * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
 139 * on engine 0 and 1.
 140 */
 141static int
 142vgpu_scan_nonprivbb_set(void *data, u64 val)
 143{
 144        struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
 145
 146        vgpu->scan_nonprivbb = val;
 147        return 0;
 148}
 149
 150DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
 151                        vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
 152                        "0x%llx\n");
 153
 154/**
 155 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
 156 * @vgpu: a vGPU
 157 */
 158void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
 159{
 160        char name[16] = "";
 161
 162        snprintf(name, 16, "vgpu%d", vgpu->id);
 163        vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
 164
 165        debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
 166        debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
 167                            &vgpu_mmio_diff_fops);
 168        debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
 169                            &vgpu_scan_nonprivbb_fops);
 170}
 171
 172/**
 173 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
 174 * @vgpu: a vGPU
 175 */
 176void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
 177{
 178        debugfs_remove_recursive(vgpu->debugfs);
 179        vgpu->debugfs = NULL;
 180}
 181
 182/**
 183 * intel_gvt_debugfs_init - register gvt debugfs root entry
 184 * @gvt: GVT device
 185 */
 186void intel_gvt_debugfs_init(struct intel_gvt *gvt)
 187{
 188        struct drm_minor *minor = gvt->gt->i915->drm.primary;
 189
 190        gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
 191
 192        debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
 193                             &gvt->mmio.num_tracked_mmio);
 194}
 195
 196/**
 197 * intel_gvt_debugfs_clean - remove debugfs entries
 198 * @gvt: GVT device
 199 */
 200void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
 201{
 202        debugfs_remove_recursive(gvt->debugfs_root);
 203        gvt->debugfs_root = NULL;
 204}
 205