2017-09-26 15:19:13 +07:00
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/*
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* Copyright(c) 2011-2017 Intel Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/debugfs.h>
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drm/i915/gvt: Add new debugfs tool mmio_diff
This new debugfs entry is used to figure out which registers of vGPU
is different to host. It is a useful tool for new platform enabling
and debugging. When read this entry, all the diff mmio are recognized
and sorted by mmio offset. Besides, the bit positions of different
value are listed in 'Diff' column. Here is a show:
$ sudo cat ./mmio_diff
Offset HW vGPU Diff
00002030 000025f8 00000000 3-8,10,13
00002034 012025f8 00000000 3-8,10,13,21,24
00002038 027fb000 00000000 12-13,15-22,25
0000203c 00003000 00000000 12-13
00002054 0000000a 00000040 1,3,6
00002074 012025f8 00000000 3-8,10,13,21,24
00002080 fffe6000 00000000 13-14,17-31
000020a8 fffffeff ffffffff 8
000020d4 00000004 00000000 2
....
00145974 eb42718c 010c11b0 2-5,13-14,17-19,22,25,27,29-31
00145978 0000002f 0000002a 0,2
0014597c 0000002f 0000002a 0,2
00145980 0000002b 00000028 0-1
00145984 a5a87c9e b27d20c0 1-4,6,10-12,14,16,18,20,22-26,28
001459c0 88390000 883c0000 16,18
00146200 88350000 883a0000 16-19
Total: 72432, Diff: 901
v3: fix a typo.
v2: add mmio_hw_access_pre/post().
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2017-10-23 10:46:44 +07:00
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#include <linux/list_sort.h>
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2017-09-26 15:19:13 +07:00
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#include "i915_drv.h"
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#include "gvt.h"
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drm/i915/gvt: Add new debugfs tool mmio_diff
This new debugfs entry is used to figure out which registers of vGPU
is different to host. It is a useful tool for new platform enabling
and debugging. When read this entry, all the diff mmio are recognized
and sorted by mmio offset. Besides, the bit positions of different
value are listed in 'Diff' column. Here is a show:
$ sudo cat ./mmio_diff
Offset HW vGPU Diff
00002030 000025f8 00000000 3-8,10,13
00002034 012025f8 00000000 3-8,10,13,21,24
00002038 027fb000 00000000 12-13,15-22,25
0000203c 00003000 00000000 12-13
00002054 0000000a 00000040 1,3,6
00002074 012025f8 00000000 3-8,10,13,21,24
00002080 fffe6000 00000000 13-14,17-31
000020a8 fffffeff ffffffff 8
000020d4 00000004 00000000 2
....
00145974 eb42718c 010c11b0 2-5,13-14,17-19,22,25,27,29-31
00145978 0000002f 0000002a 0,2
0014597c 0000002f 0000002a 0,2
00145980 0000002b 00000028 0-1
00145984 a5a87c9e b27d20c0 1-4,6,10-12,14,16,18,20,22-26,28
001459c0 88390000 883c0000 16,18
00146200 88350000 883a0000 16-19
Total: 72432, Diff: 901
v3: fix a typo.
v2: add mmio_hw_access_pre/post().
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2017-10-23 10:46:44 +07:00
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struct mmio_diff_param {
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struct intel_vgpu *vgpu;
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int total;
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int diff;
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struct list_head diff_mmio_list;
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};
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struct diff_mmio {
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struct list_head node;
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u32 offset;
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u32 preg;
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u32 vreg;
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};
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/* Compare two diff_mmio items. */
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static int mmio_offset_compare(void *priv,
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struct list_head *a, struct list_head *b)
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{
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struct diff_mmio *ma;
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struct diff_mmio *mb;
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ma = container_of(a, struct diff_mmio, node);
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mb = container_of(b, struct diff_mmio, node);
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if (ma->offset < mb->offset)
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return -1;
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else if (ma->offset > mb->offset)
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return 1;
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return 0;
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}
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static inline int mmio_diff_handler(struct intel_gvt *gvt,
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u32 offset, void *data)
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{
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struct drm_i915_private *dev_priv = gvt->dev_priv;
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struct mmio_diff_param *param = data;
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struct diff_mmio *node;
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u32 preg, vreg;
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preg = I915_READ_NOTRACE(_MMIO(offset));
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vreg = vgpu_vreg(param->vgpu, offset);
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if (preg != vreg) {
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node = kmalloc(sizeof(*node), GFP_KERNEL);
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if (!node)
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return -ENOMEM;
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node->offset = offset;
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node->preg = preg;
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node->vreg = vreg;
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list_add(&node->node, ¶m->diff_mmio_list);
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param->diff++;
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}
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param->total++;
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return 0;
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}
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/* Show the all the different values of tracked mmio. */
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static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
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{
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struct intel_vgpu *vgpu = s->private;
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struct intel_gvt *gvt = vgpu->gvt;
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struct mmio_diff_param param = {
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.vgpu = vgpu,
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.total = 0,
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.diff = 0,
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};
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struct diff_mmio *node, *next;
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INIT_LIST_HEAD(¶m.diff_mmio_list);
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mutex_lock(&gvt->lock);
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spin_lock_bh(&gvt->scheduler.mmio_context_lock);
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mmio_hw_access_pre(gvt->dev_priv);
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/* Recognize all the diff mmios to list. */
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intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, ¶m);
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mmio_hw_access_post(gvt->dev_priv);
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spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
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mutex_unlock(&gvt->lock);
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/* In an ascending order by mmio offset. */
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list_sort(NULL, ¶m.diff_mmio_list, mmio_offset_compare);
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seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
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list_for_each_entry_safe(node, next, ¶m.diff_mmio_list, node) {
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u32 diff = node->preg ^ node->vreg;
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seq_printf(s, "%08x %08x %08x %*pbl\n",
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node->offset, node->preg, node->vreg,
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32, &diff);
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list_del(&node->node);
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kfree(node);
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}
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seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
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return 0;
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}
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2018-03-16 21:12:13 +07:00
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DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
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2017-09-26 15:19:13 +07:00
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2018-04-04 12:57:09 +07:00
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static int
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vgpu_scan_nonprivbb_get(void *data, u64 *val)
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{
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struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
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*val = vgpu->scan_nonprivbb;
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return 0;
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}
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/*
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* set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
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* of non-privileged batch buffer. e.g.
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* if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
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* on engine 0 and 1.
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*/
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static int
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vgpu_scan_nonprivbb_set(void *data, u64 val)
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{
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struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
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struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
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enum intel_engine_id id;
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char buf[128], *s;
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int len;
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val &= (1 << I915_NUM_ENGINES) - 1;
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if (vgpu->scan_nonprivbb == val)
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return 0;
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if (!val)
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goto done;
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len = sprintf(buf,
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"gvt: vgpu %d turns on non-privileged batch buffers scanning on Engines:",
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vgpu->id);
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s = buf + len;
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for (id = 0; id < I915_NUM_ENGINES; id++) {
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struct intel_engine_cs *engine;
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engine = dev_priv->engine[id];
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if (engine && (val & (1 << id))) {
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len = snprintf(s, 4, "%d, ", engine->id);
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s += len;
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} else
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val &= ~(1 << id);
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}
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if (val)
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sprintf(s, "low performance expected.");
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pr_warn("%s\n", buf);
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done:
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vgpu->scan_nonprivbb = val;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
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vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
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"0x%llx\n");
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2017-09-26 15:19:13 +07:00
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/**
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* intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
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* @vgpu: a vGPU
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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int intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
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{
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struct dentry *ent;
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char name[10] = "";
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sprintf(name, "vgpu%d", vgpu->id);
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vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
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if (!vgpu->debugfs)
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return -ENOMEM;
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ent = debugfs_create_bool("active", 0444, vgpu->debugfs,
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&vgpu->active);
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if (!ent)
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return -ENOMEM;
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drm/i915/gvt: Add new debugfs tool mmio_diff
This new debugfs entry is used to figure out which registers of vGPU
is different to host. It is a useful tool for new platform enabling
and debugging. When read this entry, all the diff mmio are recognized
and sorted by mmio offset. Besides, the bit positions of different
value are listed in 'Diff' column. Here is a show:
$ sudo cat ./mmio_diff
Offset HW vGPU Diff
00002030 000025f8 00000000 3-8,10,13
00002034 012025f8 00000000 3-8,10,13,21,24
00002038 027fb000 00000000 12-13,15-22,25
0000203c 00003000 00000000 12-13
00002054 0000000a 00000040 1,3,6
00002074 012025f8 00000000 3-8,10,13,21,24
00002080 fffe6000 00000000 13-14,17-31
000020a8 fffffeff ffffffff 8
000020d4 00000004 00000000 2
....
00145974 eb42718c 010c11b0 2-5,13-14,17-19,22,25,27,29-31
00145978 0000002f 0000002a 0,2
0014597c 0000002f 0000002a 0,2
00145980 0000002b 00000028 0-1
00145984 a5a87c9e b27d20c0 1-4,6,10-12,14,16,18,20,22-26,28
001459c0 88390000 883c0000 16,18
00146200 88350000 883a0000 16-19
Total: 72432, Diff: 901
v3: fix a typo.
v2: add mmio_hw_access_pre/post().
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2017-10-23 10:46:44 +07:00
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ent = debugfs_create_file("mmio_diff", 0444, vgpu->debugfs,
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vgpu, &vgpu_mmio_diff_fops);
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if (!ent)
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return -ENOMEM;
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2018-04-04 12:57:09 +07:00
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ent = debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs,
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vgpu, &vgpu_scan_nonprivbb_fops);
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if (!ent)
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return -ENOMEM;
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2017-09-26 15:19:13 +07:00
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return 0;
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}
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/**
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* intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
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* @vgpu: a vGPU
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*/
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void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
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{
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debugfs_remove_recursive(vgpu->debugfs);
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vgpu->debugfs = NULL;
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}
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/**
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* intel_gvt_debugfs_init - register gvt debugfs root entry
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* @gvt: GVT device
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*
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* Returns:
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* zero on success, negative if failed.
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*/
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int intel_gvt_debugfs_init(struct intel_gvt *gvt)
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{
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struct drm_minor *minor = gvt->dev_priv->drm.primary;
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struct dentry *ent;
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gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
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if (!gvt->debugfs_root) {
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gvt_err("Cannot create debugfs dir\n");
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return -ENOMEM;
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}
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ent = debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
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&gvt->mmio.num_tracked_mmio);
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if (!ent)
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return -ENOMEM;
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return 0;
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}
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/**
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* intel_gvt_debugfs_clean - remove debugfs entries
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* @gvt: GVT device
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*/
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void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
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{
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debugfs_remove_recursive(gvt->debugfs_root);
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gvt->debugfs_root = NULL;
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}
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