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