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