sysfs.c (4753B)
1// SPDX-License-Identifier: GPL-2.0+ 2// Copyright 2017 IBM Corp. 3#include <linux/sysfs.h> 4#include "ocxl_internal.h" 5 6static inline struct ocxl_afu *to_afu(struct device *device) 7{ 8 struct ocxl_file_info *info = container_of(device, struct ocxl_file_info, dev); 9 10 return info->afu; 11} 12 13static ssize_t global_mmio_size_show(struct device *device, 14 struct device_attribute *attr, 15 char *buf) 16{ 17 struct ocxl_afu *afu = to_afu(device); 18 19 return scnprintf(buf, PAGE_SIZE, "%d\n", 20 afu->config.global_mmio_size); 21} 22 23static ssize_t pp_mmio_size_show(struct device *device, 24 struct device_attribute *attr, 25 char *buf) 26{ 27 struct ocxl_afu *afu = to_afu(device); 28 29 return scnprintf(buf, PAGE_SIZE, "%d\n", 30 afu->config.pp_mmio_stride); 31} 32 33static ssize_t afu_version_show(struct device *device, 34 struct device_attribute *attr, 35 char *buf) 36{ 37 struct ocxl_afu *afu = to_afu(device); 38 39 return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n", 40 afu->config.version_major, 41 afu->config.version_minor); 42} 43 44static ssize_t contexts_show(struct device *device, 45 struct device_attribute *attr, 46 char *buf) 47{ 48 struct ocxl_afu *afu = to_afu(device); 49 50 return scnprintf(buf, PAGE_SIZE, "%d/%d\n", 51 afu->pasid_count, afu->pasid_max); 52} 53 54static ssize_t reload_on_reset_show(struct device *device, 55 struct device_attribute *attr, 56 char *buf) 57{ 58 struct ocxl_afu *afu = to_afu(device); 59 struct ocxl_fn *fn = afu->fn; 60 struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent); 61 int val; 62 63 if (ocxl_config_get_reset_reload(pci_dev, &val)) 64 return scnprintf(buf, PAGE_SIZE, "unavailable\n"); 65 66 return scnprintf(buf, PAGE_SIZE, "%d\n", val); 67} 68 69static ssize_t reload_on_reset_store(struct device *device, 70 struct device_attribute *attr, 71 const char *buf, size_t count) 72{ 73 struct ocxl_afu *afu = to_afu(device); 74 struct ocxl_fn *fn = afu->fn; 75 struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent); 76 int rc, val; 77 78 rc = kstrtoint(buf, 0, &val); 79 if (rc || (val != 0 && val != 1)) 80 return -EINVAL; 81 82 if (ocxl_config_set_reset_reload(pci_dev, val)) 83 return -ENODEV; 84 85 return count; 86} 87 88static struct device_attribute afu_attrs[] = { 89 __ATTR_RO(global_mmio_size), 90 __ATTR_RO(pp_mmio_size), 91 __ATTR_RO(afu_version), 92 __ATTR_RO(contexts), 93 __ATTR_RW(reload_on_reset), 94}; 95 96static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj, 97 struct bin_attribute *bin_attr, char *buf, 98 loff_t off, size_t count) 99{ 100 struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj)); 101 102 if (count == 0 || off < 0 || 103 off >= afu->config.global_mmio_size) 104 return 0; 105 memcpy_fromio(buf, afu->global_mmio_ptr + off, count); 106 return count; 107} 108 109static vm_fault_t global_mmio_fault(struct vm_fault *vmf) 110{ 111 struct vm_area_struct *vma = vmf->vma; 112 struct ocxl_afu *afu = vma->vm_private_data; 113 unsigned long offset; 114 115 if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT)) 116 return VM_FAULT_SIGBUS; 117 118 offset = vmf->pgoff; 119 offset += (afu->global_mmio_start >> PAGE_SHIFT); 120 return vmf_insert_pfn(vma, vmf->address, offset); 121} 122 123static const struct vm_operations_struct global_mmio_vmops = { 124 .fault = global_mmio_fault, 125}; 126 127static int global_mmio_mmap(struct file *filp, struct kobject *kobj, 128 struct bin_attribute *bin_attr, 129 struct vm_area_struct *vma) 130{ 131 struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj)); 132 133 if ((vma_pages(vma) + vma->vm_pgoff) > 134 (afu->config.global_mmio_size >> PAGE_SHIFT)) 135 return -EINVAL; 136 137 vma->vm_flags |= VM_IO | VM_PFNMAP; 138 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 139 vma->vm_ops = &global_mmio_vmops; 140 vma->vm_private_data = afu; 141 return 0; 142} 143 144int ocxl_sysfs_register_afu(struct ocxl_file_info *info) 145{ 146 int i, rc; 147 148 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) { 149 rc = device_create_file(&info->dev, &afu_attrs[i]); 150 if (rc) 151 goto err; 152 } 153 154 sysfs_attr_init(&info->attr_global_mmio.attr); 155 info->attr_global_mmio.attr.name = "global_mmio_area"; 156 info->attr_global_mmio.attr.mode = 0600; 157 info->attr_global_mmio.size = info->afu->config.global_mmio_size; 158 info->attr_global_mmio.read = global_mmio_read; 159 info->attr_global_mmio.mmap = global_mmio_mmap; 160 rc = device_create_bin_file(&info->dev, &info->attr_global_mmio); 161 if (rc) { 162 dev_err(&info->dev, "Unable to create global mmio attr for afu: %d\n", rc); 163 goto err; 164 } 165 166 return 0; 167 168err: 169 for (i--; i >= 0; i--) 170 device_remove_file(&info->dev, &afu_attrs[i]); 171 172 return rc; 173} 174 175void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info) 176{ 177 int i; 178 179 /* 180 * device_remove_bin_file is safe to call if the file is not added as 181 * the files are removed by name, and early exit if not found 182 */ 183 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) 184 device_remove_file(&info->dev, &afu_attrs[i]); 185 device_remove_bin_file(&info->dev, &info->attr_global_mmio); 186}