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 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 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 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 */ 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