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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
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2 | #include <linux/slab.h> |
3 | #include <linux/types.h> | |
4 | #include <linux/mm.h> | |
5 | #include <linux/fs.h> | |
6 | ||
7 | #include <xen/page.h> | |
332f791d | 8 | #include <xen/xenbus.h> |
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9 | |
10 | #include "xenfs.h" | |
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11 | |
12 | static ssize_t xsd_read(struct file *file, char __user *buf, | |
13 | size_t size, loff_t *off) | |
14 | { | |
15 | const char *str = (const char *)file->private_data; | |
16 | return simple_read_from_buffer(buf, size, off, str, strlen(str)); | |
17 | } | |
18 | ||
19 | static int xsd_release(struct inode *inode, struct file *file) | |
20 | { | |
21 | kfree(file->private_data); | |
22 | return 0; | |
23 | } | |
24 | ||
25 | static int xsd_kva_open(struct inode *inode, struct file *file) | |
26 | { | |
27 | file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p", | |
28 | xen_store_interface); | |
29 | if (!file->private_data) | |
30 | return -ENOMEM; | |
31 | return 0; | |
32 | } | |
33 | ||
34 | static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma) | |
35 | { | |
36 | size_t size = vma->vm_end - vma->vm_start; | |
37 | ||
38 | if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0)) | |
39 | return -EINVAL; | |
40 | ||
41 | if (remap_pfn_range(vma, vma->vm_start, | |
42 | virt_to_pfn(xen_store_interface), | |
43 | size, vma->vm_page_prot)) | |
44 | return -EAGAIN; | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | const struct file_operations xsd_kva_file_ops = { | |
50 | .open = xsd_kva_open, | |
51 | .mmap = xsd_kva_mmap, | |
52 | .read = xsd_read, | |
53 | .release = xsd_release, | |
54 | }; | |
55 | ||
56 | static int xsd_port_open(struct inode *inode, struct file *file) | |
57 | { | |
58 | file->private_data = (void *)kasprintf(GFP_KERNEL, "%d", | |
59 | xen_store_evtchn); | |
60 | if (!file->private_data) | |
61 | return -ENOMEM; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | const struct file_operations xsd_port_file_ops = { | |
66 | .open = xsd_port_open, | |
67 | .read = xsd_read, | |
68 | .release = xsd_release, | |
69 | }; |