^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <xen/interface/platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/xen/hypercall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <xen/xen-ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "xenfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct xensyms {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct xen_platform_op op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) uint32_t namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Grab next output page from the hypervisor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int xensyms_next_sym(struct xensyms *xs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct xenpf_symdata *symdata = &xs->op.u.symdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) uint64_t symnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) memset(xs->name, 0, xs->namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) symdata->namelen = xs->namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) symnum = symdata->symnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ret = HYPERVISOR_platform_op(&xs->op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * If hypervisor's symbol didn't fit into the buffer then allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * a larger buffer and try again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (unlikely(symdata->namelen > xs->namelen)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) kfree(xs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) xs->namelen = symdata->namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) xs->name = kzalloc(xs->namelen, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (!xs->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) set_xen_guest_handle(symdata->name, xs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) symdata->symnum--; /* Rewind */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ret = HYPERVISOR_platform_op(&xs->op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (symdata->symnum == symnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* End of symbols */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static void *xensyms_start(struct seq_file *m, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct xensyms *xs = (struct xensyms *)m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) xs->op.u.symdata.symnum = *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (xensyms_next_sym(xs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct xensyms *xs = (struct xensyms *)m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) xs->op.u.symdata.symnum = ++(*pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (xensyms_next_sym(xs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static int xensyms_show(struct seq_file *m, void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct xensyms *xs = (struct xensyms *)m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct xenpf_symdata *symdata = &xs->op.u.symdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) seq_printf(m, "%016llx %c %s\n", symdata->address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) symdata->type, xs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static void xensyms_stop(struct seq_file *m, void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static const struct seq_operations xensyms_seq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .start = xensyms_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .next = xensyms_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .show = xensyms_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .stop = xensyms_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int xensyms_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct seq_file *m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct xensyms *xs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) ret = seq_open_private(file, &xensyms_seq_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) sizeof(struct xensyms));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) xs = (struct xensyms *)m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) xs->namelen = XEN_KSYM_NAME_LEN + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) xs->name = kzalloc(xs->namelen, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (!xs->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) set_xen_guest_handle(xs->op.u.symdata.name, xs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) xs->op.cmd = XENPF_get_symbol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) xs->op.u.symdata.namelen = xs->namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int xensyms_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct seq_file *m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct xensyms *xs = (struct xensyms *)m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) kfree(xs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) const struct file_operations xensyms_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .open = xensyms_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) .release = xensyms_release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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