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}