diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/debugfs.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/debugfs.c b/drivers/gpu/drm/i915/gvt/debugfs.c new file mode 100644 index 000000000000..32a66dfdf112 --- /dev/null +++ b/drivers/gpu/drm/i915/gvt/debugfs.c @@ -0,0 +1,212 @@ +/* + * Copyright(c) 2011-2017 Intel Corporation. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#include <linux/debugfs.h> +#include <linux/list_sort.h> +#include "i915_drv.h" +#include "gvt.h" + +struct mmio_diff_param { + struct intel_vgpu *vgpu; + int total; + int diff; + struct list_head diff_mmio_list; +}; + +struct diff_mmio { + struct list_head node; + u32 offset; + u32 preg; + u32 vreg; +}; + +/* Compare two diff_mmio items. */ +static int mmio_offset_compare(void *priv, + struct list_head *a, struct list_head *b) +{ + struct diff_mmio *ma; + struct diff_mmio *mb; + + ma = container_of(a, struct diff_mmio, node); + mb = container_of(b, struct diff_mmio, node); + if (ma->offset < mb->offset) + return -1; + else if (ma->offset > mb->offset) + return 1; + return 0; +} + +static inline int mmio_diff_handler(struct intel_gvt *gvt, + u32 offset, void *data) +{ + struct drm_i915_private *dev_priv = gvt->dev_priv; + struct mmio_diff_param *param = data; + struct diff_mmio *node; + u32 preg, vreg; + + preg = I915_READ_NOTRACE(_MMIO(offset)); + vreg = vgpu_vreg(param->vgpu, offset); + + if (preg != vreg) { + node = kmalloc(sizeof(*node), GFP_KERNEL); + if (!node) + return -ENOMEM; + + node->offset = offset; + node->preg = preg; + node->vreg = vreg; + list_add(&node->node, ¶m->diff_mmio_list); + param->diff++; + } + param->total++; + return 0; +} + +/* Show the all the different values of tracked mmio. */ +static int vgpu_mmio_diff_show(struct seq_file *s, void *unused) +{ + struct intel_vgpu *vgpu = s->private; + struct intel_gvt *gvt = vgpu->gvt; + struct mmio_diff_param param = { + .vgpu = vgpu, + .total = 0, + .diff = 0, + }; + struct diff_mmio *node, *next; + + INIT_LIST_HEAD(¶m.diff_mmio_list); + + mutex_lock(&gvt->lock); + spin_lock_bh(&gvt->scheduler.mmio_context_lock); + + mmio_hw_access_pre(gvt->dev_priv); + /* Recognize all the diff mmios to list. */ + intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, ¶m); + mmio_hw_access_post(gvt->dev_priv); + + spin_unlock_bh(&gvt->scheduler.mmio_context_lock); + mutex_unlock(&gvt->lock); + + /* In an ascending order by mmio offset. */ + list_sort(NULL, ¶m.diff_mmio_list, mmio_offset_compare); + + seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff"); + list_for_each_entry_safe(node, next, ¶m.diff_mmio_list, node) { + u32 diff = node->preg ^ node->vreg; + + seq_printf(s, "%08x %08x %08x %*pbl\n", + node->offset, node->preg, node->vreg, + 32, &diff); + list_del(&node->node); + kfree(node); + } + seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff); + return 0; +} + +static int vgpu_mmio_diff_open(struct inode *inode, struct file *file) +{ + return single_open(file, vgpu_mmio_diff_show, inode->i_private); +} + +static const struct file_operations vgpu_mmio_diff_fops = { + .open = vgpu_mmio_diff_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +/** + * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU + * @vgpu: a vGPU + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu) +{ + struct dentry *ent; + char name[10] = ""; + + sprintf(name, "vgpu%d", vgpu->id); + vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root); + if (!vgpu->debugfs) + return -ENOMEM; + + ent = debugfs_create_bool("active", 0444, vgpu->debugfs, + &vgpu->active); + if (!ent) + return -ENOMEM; + + ent = debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, + vgpu, &vgpu_mmio_diff_fops); + if (!ent) + return -ENOMEM; + + return 0; +} + +/** + * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU + * @vgpu: a vGPU + */ +void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu) +{ + debugfs_remove_recursive(vgpu->debugfs); + vgpu->debugfs = NULL; +} + +/** + * intel_gvt_debugfs_init - register gvt debugfs root entry + * @gvt: GVT device + * + * Returns: + * zero on success, negative if failed. + */ +int intel_gvt_debugfs_init(struct intel_gvt *gvt) +{ + struct drm_minor *minor = gvt->dev_priv->drm.primary; + struct dentry *ent; + + gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root); + if (!gvt->debugfs_root) { + gvt_err("Cannot create debugfs dir\n"); + return -ENOMEM; + } + + ent = debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root, + &gvt->mmio.num_tracked_mmio); + if (!ent) + return -ENOMEM; + + return 0; +} + +/** + * intel_gvt_debugfs_clean - remove debugfs entries + * @gvt: GVT device + */ +void intel_gvt_debugfs_clean(struct intel_gvt *gvt) +{ + debugfs_remove_recursive(gvt->debugfs_root); + gvt->debugfs_root = NULL; +} |