1 // SPDX-License-Identifier: GPL-2.0+ 2 // Copyright 2017 IBM Corp. 3 #include <linux/sysfs.h> 4 #include "ocxl_internal.h" 5 6 static 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 13 static 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 23 static 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 33 static 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 44 static 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 54 static struct device_attribute afu_attrs[] = { 55 __ATTR_RO(global_mmio_size), 56 __ATTR_RO(pp_mmio_size), 57 __ATTR_RO(afu_version), 58 __ATTR_RO(contexts), 59 }; 60 61 static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj, 62 struct bin_attribute *bin_attr, char *buf, 63 loff_t off, size_t count) 64 { 65 struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj)); 66 67 if (count == 0 || off < 0 || 68 off >= afu->config.global_mmio_size) 69 return 0; 70 memcpy_fromio(buf, afu->global_mmio_ptr + off, count); 71 return count; 72 } 73 74 static vm_fault_t global_mmio_fault(struct vm_fault *vmf) 75 { 76 struct vm_area_struct *vma = vmf->vma; 77 struct ocxl_afu *afu = vma->vm_private_data; 78 unsigned long offset; 79 80 if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT)) 81 return VM_FAULT_SIGBUS; 82 83 offset = vmf->pgoff; 84 offset += (afu->global_mmio_start >> PAGE_SHIFT); 85 return vmf_insert_pfn(vma, vmf->address, offset); 86 } 87 88 static const struct vm_operations_struct global_mmio_vmops = { 89 .fault = global_mmio_fault, 90 }; 91 92 static int global_mmio_mmap(struct file *filp, struct kobject *kobj, 93 struct bin_attribute *bin_attr, 94 struct vm_area_struct *vma) 95 { 96 struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj)); 97 98 if ((vma_pages(vma) + vma->vm_pgoff) > 99 (afu->config.global_mmio_size >> PAGE_SHIFT)) 100 return -EINVAL; 101 102 vma->vm_flags |= VM_IO | VM_PFNMAP; 103 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 104 vma->vm_ops = &global_mmio_vmops; 105 vma->vm_private_data = afu; 106 return 0; 107 } 108 109 int ocxl_sysfs_register_afu(struct ocxl_file_info *info) 110 { 111 int i, rc; 112 113 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) { 114 rc = device_create_file(&info->dev, &afu_attrs[i]); 115 if (rc) 116 goto err; 117 } 118 119 sysfs_attr_init(&info->attr_global_mmio.attr); 120 info->attr_global_mmio.attr.name = "global_mmio_area"; 121 info->attr_global_mmio.attr.mode = 0600; 122 info->attr_global_mmio.size = info->afu->config.global_mmio_size; 123 info->attr_global_mmio.read = global_mmio_read; 124 info->attr_global_mmio.mmap = global_mmio_mmap; 125 rc = device_create_bin_file(&info->dev, &info->attr_global_mmio); 126 if (rc) { 127 dev_err(&info->dev, "Unable to create global mmio attr for afu: %d\n", rc); 128 goto err; 129 } 130 131 return 0; 132 133 err: 134 for (i--; i >= 0; i--) 135 device_remove_file(&info->dev, &afu_attrs[i]); 136 137 return rc; 138 } 139 140 void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info) 141 { 142 int i; 143 144 /* 145 * device_remove_bin_file is safe to call if the file is not added as 146 * the files are removed by name, and early exit if not found 147 */ 148 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) 149 device_remove_file(&info->dev, &afu_attrs[i]); 150 device_remove_bin_file(&info->dev, &info->attr_global_mmio); 151 } 152