v4.19.13 snapshot.
diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c
new file mode 100644
index 0000000..0ab1fd1
--- /dev/null
+++ b/drivers/misc/ocxl/sysfs.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/sysfs.h>
+#include "ocxl_internal.h"
+
+static ssize_t global_mmio_size_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_ocxl_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n",
+ afu->config.global_mmio_size);
+}
+
+static ssize_t pp_mmio_size_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_ocxl_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n",
+ afu->config.pp_mmio_stride);
+}
+
+static ssize_t afu_version_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_ocxl_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n",
+ afu->config.version_major,
+ afu->config.version_minor);
+}
+
+static ssize_t contexts_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_ocxl_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%d/%d\n",
+ afu->pasid_count, afu->pasid_max);
+}
+
+static struct device_attribute afu_attrs[] = {
+ __ATTR_RO(global_mmio_size),
+ __ATTR_RO(pp_mmio_size),
+ __ATTR_RO(afu_version),
+ __ATTR_RO(contexts),
+};
+
+static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct ocxl_afu *afu = to_ocxl_afu(kobj_to_dev(kobj));
+
+ if (count == 0 || off < 0 ||
+ off >= afu->config.global_mmio_size)
+ return 0;
+ memcpy_fromio(buf, afu->global_mmio_ptr + off, count);
+ return count;
+}
+
+static vm_fault_t global_mmio_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct ocxl_afu *afu = vma->vm_private_data;
+ unsigned long offset;
+
+ if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT))
+ return VM_FAULT_SIGBUS;
+
+ offset = vmf->pgoff;
+ offset += (afu->global_mmio_start >> PAGE_SHIFT);
+ return vmf_insert_pfn(vma, vmf->address, offset);
+}
+
+static const struct vm_operations_struct global_mmio_vmops = {
+ .fault = global_mmio_fault,
+};
+
+static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ struct vm_area_struct *vma)
+{
+ struct ocxl_afu *afu = to_ocxl_afu(kobj_to_dev(kobj));
+
+ if ((vma_pages(vma) + vma->vm_pgoff) >
+ (afu->config.global_mmio_size >> PAGE_SHIFT))
+ return -EINVAL;
+
+ vma->vm_flags |= VM_IO | VM_PFNMAP;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_ops = &global_mmio_vmops;
+ vma->vm_private_data = afu;
+ return 0;
+}
+
+int ocxl_sysfs_add_afu(struct ocxl_afu *afu)
+{
+ int i, rc;
+
+ for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
+ rc = device_create_file(&afu->dev, &afu_attrs[i]);
+ if (rc)
+ goto err;
+ }
+
+ sysfs_attr_init(&afu->attr_global_mmio.attr);
+ afu->attr_global_mmio.attr.name = "global_mmio_area";
+ afu->attr_global_mmio.attr.mode = 0600;
+ afu->attr_global_mmio.size = afu->config.global_mmio_size;
+ afu->attr_global_mmio.read = global_mmio_read;
+ afu->attr_global_mmio.mmap = global_mmio_mmap;
+ rc = device_create_bin_file(&afu->dev, &afu->attr_global_mmio);
+ if (rc) {
+ dev_err(&afu->dev,
+ "Unable to create global mmio attr for afu: %d\n",
+ rc);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ for (i--; i >= 0; i--)
+ device_remove_file(&afu->dev, &afu_attrs[i]);
+ return rc;
+}
+
+void ocxl_sysfs_remove_afu(struct ocxl_afu *afu)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
+ device_remove_file(&afu->dev, &afu_attrs[i]);
+ device_remove_bin_file(&afu->dev, &afu->attr_global_mmio);
+}