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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 vm_flags_set(vma, 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 as181 * the files are removed by name, and early exit if not found182 */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}187