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 28 static struct xe_tile *dev_to_tile(struct device *dev) 29 { 30 return kobj_to_tile(dev->kobj.parent); 31 } 32 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 struct xe_gt *gt = tile->primary_gt; 38 u32 val, mbox; 39 int err; 40 41 mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG) 42 | REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_P0) 43 | REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM); 44 45 err = xe_pcode_read(gt, mbox, &val, NULL); 46 if (err) 47 return err; 48 49 /* data_out - Fused P0 for domain ID in units of 50 MHz */ 50 val *= 50; 51 52 return sysfs_emit(buf, "%u\n", val); 53 } 54 static DEVICE_ATTR_RO(max_freq); 55 56 static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, 57 char *buf) 58 { 59 struct xe_tile *tile = dev_to_tile(dev); 60 struct xe_gt *gt = tile->primary_gt; 61 u32 val, mbox; 62 int err; 63 64 mbox = REG_FIELD_PREP(PCODE_MB_COMMAND, PCODE_FREQUENCY_CONFIG) 65 | REG_FIELD_PREP(PCODE_MB_PARAM1, PCODE_MBOX_FC_SC_READ_FUSED_PN) 66 | REG_FIELD_PREP(PCODE_MB_PARAM2, PCODE_MBOX_DOMAIN_HBM); 67 68 err = xe_pcode_read(gt, mbox, &val, NULL); 69 if (err) 70 return err; 71 72 /* data_out - Fused Pn for domain ID in units of 50 MHz */ 73 val *= 50; 74 75 return sysfs_emit(buf, "%u\n", val); 76 } 77 static DEVICE_ATTR_RO(min_freq); 78 79 static struct attribute *freq_attrs[] = { 80 &dev_attr_max_freq.attr, 81 &dev_attr_min_freq.attr, 82 NULL 83 }; 84 85 static const struct attribute_group freq_group_attrs = { 86 .name = "freq0", 87 .attrs = freq_attrs, 88 }; 89 90 static void vram_freq_sysfs_fini(void *arg) 91 { 92 struct kobject *kobj = arg; 93 94 sysfs_remove_group(kobj, &freq_group_attrs); 95 kobject_put(kobj); 96 } 97 98 /** 99 * xe_vram_freq_sysfs_init - Initialize vram frequency sysfs component 100 * @tile: Xe Tile object 101 * 102 * It needs to be initialized after the main tile component is ready 103 * 104 * Returns: 0 on success, negative error code on error. 105 */ 106 int xe_vram_freq_sysfs_init(struct xe_tile *tile) 107 { 108 struct xe_device *xe = tile_to_xe(tile); 109 struct kobject *kobj; 110 int err; 111 112 if (xe->info.platform != XE_PVC) 113 return 0; 114 115 kobj = kobject_create_and_add("memory", tile->sysfs); 116 if (!kobj) 117 return -ENOMEM; 118 119 err = sysfs_create_group(kobj, &freq_group_attrs); 120 if (err) { 121 kobject_put(kobj); 122 return err; 123 } 124 125 return devm_add_action_or_reset(xe->drm.dev, vram_freq_sysfs_fini, kobj); 126 } 127