1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2024 Intel Corporation
4 */
5 #include <linux/sysfs.h>
6 #include <drm/drm_managed.h>
7
8 #include "xe_gt_types.h"
9 #include "xe_pcode.h"
10 #include "xe_pcode_api.h"
11 #include "xe_tile.h"
12 #include "xe_tile_sysfs.h"
13 #include "xe_vram_freq.h"
14
15 /**
16 * DOC: Xe VRAM freq
17 *
18 * Provides sysfs entries for vram frequency in tile
19 *
20 * device/tile#/memory/freq0/max_freq - This is maximum frequency. This value is read-only as it
21 * is the fixed fuse point P0. It is not the system
22 * configuration.
23 * device/tile#/memory/freq0/min_freq - This is minimum frequency. This value is read-only as it
24 * is the fixed fuse point PN. It is not the system
25 * configuration.
26 */
27
dev_to_tile(struct device * dev)28 static struct xe_tile *dev_to_tile(struct device *dev)
29 {
30 return kobj_to_tile(dev->kobj.parent);
31 }
32
max_freq_show(struct device * dev,struct device_attribute * attr,char * buf)33 static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
34 char *buf)
35 {
36 struct xe_tile *tile = dev_to_tile(dev);
37 u32 val, mbox;
38 int err;
39
40 mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
41 | REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0)
42 | REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
43
44 err = xe_pcode_read(tile, mbox, &val, NULL);
45 if (err)
46 return err;
47
48 /* data_out - Fused P0 for domain ID in units of 50 MHz */
49 val *= 50;
50
51 return sysfs_emit(buf, "%u\n", val);
52 }
53 static DEVICE_ATTR_RO(max_freq);
54
min_freq_show(struct device * dev,struct device_attribute * attr,char * buf)55 static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
56 char *buf)
57 {
58 struct xe_tile *tile = dev_to_tile(dev);
59 u32 val, mbox;
60 int err;
61
62 mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG)
63 | REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN)
64 | REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM);
65
66 err = xe_pcode_read(tile, mbox, &val, NULL);
67 if (err)
68 return err;
69
70 /* data_out - Fused Pn for domain ID in units of 50 MHz */
71 val *= 50;
72
73 return sysfs_emit(buf, "%u\n", val);
74 }
75 static DEVICE_ATTR_RO(min_freq);
76
77 static struct attribute *freq_attrs[] = {
78 &dev_attr_max_freq.attr,
79 &dev_attr_min_freq.attr,
80 NULL
81 };
82
83 static const struct attribute_group freq_group_attrs = {
84 .name = "freq0",
85 .attrs = freq_attrs,
86 };
87
vram_freq_sysfs_fini(void * arg)88 static void vram_freq_sysfs_fini(void *arg)
89 {
90 struct kobject *kobj = arg;
91
92 sysfs_remove_group(kobj, &freq_group_attrs);
93 kobject_put(kobj);
94 }
95
96 /**
97 * xe_vram_freq_sysfs_init - Initialize vram frequency sysfs component
98 * @tile: Xe Tile object
99 *
100 * It needs to be initialized after the main tile component is ready
101 *
102 * Returns: 0 on success, negative error code on error.
103 */
xe_vram_freq_sysfs_init(struct xe_tile * tile)104 int xe_vram_freq_sysfs_init(struct xe_tile *tile)
105 {
106 struct xe_device *xe = tile_to_xe(tile);
107 struct kobject *kobj;
108 int err;
109
110 if (xe->info.platform != XE_PVC)
111 return 0;
112
113 kobj = kobject_create_and_add("memory", tile->sysfs);
114 if (!kobj)
115 return -ENOMEM;
116
117 err = sysfs_create_group(kobj, &freq_group_attrs);
118 if (err) {
119 kobject_put(kobj);
120 return err;
121 }
122
123 return devm_add_action_or_reset(xe->drm.dev, vram_freq_sysfs_fini, kobj);
124 }
125