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// 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 int 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);
vm_insert_pfn(vma, vmf->address, offset);
return VM_FAULT_NOPAGE;
}
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);
}
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