Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 | /* uisutils.c
*
* Copyright (C) 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uuid.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include "uniklog.h"
#include "uisutils.h"
#include "version.h"
#include "vbushelper.h"
#include <linux/skbuff.h>
#ifdef CONFIG_HIGHMEM
#include <linux/highmem.h>
#endif
/* this is shorter than using __FILE__ (full path name) in
* debug/info/error messages
*/
#define CURRENT_FILE_PC UISLIB_PC_uisutils_c
#define __MYFILE__ "uisutils.c"
/* exports */
atomic_t uisutils_registered_services = ATOMIC_INIT(0);
/* num registrations via
* uisctrl_register_req_handler() or
* uisctrl_register_req_handler_ex() */
/*****************************************************/
/* Utility functions */
/*****************************************************/
int
uisutil_add_proc_line_ex(int *total, char **buffer, int *buffer_remaining,
char *format, ...)
{
va_list args;
int len;
DBGINF("buffer = 0x%p : *buffer = 0x%p.\n", buffer, *buffer);
va_start(args, format);
len = vsnprintf(*buffer, *buffer_remaining, format, args);
if (len >= *buffer_remaining) {
*buffer += *buffer_remaining;
*total += *buffer_remaining;
*buffer_remaining = 0;
LOGERR("bytes remaining is too small!\n");
return -1;
}
*buffer_remaining -= len;
*buffer += len;
*total += len;
return len;
}
EXPORT_SYMBOL_GPL(uisutil_add_proc_line_ex);
int
uisctrl_register_req_handler(int type, void *fptr,
struct ultra_vbus_deviceinfo *chipset_driver_info)
{
LOGINF("type = %d, fptr = 0x%p.\n", type, fptr);
switch (type) {
case 2:
if (fptr) {
if (!virt_control_chan_func)
atomic_inc(&uisutils_registered_services);
virt_control_chan_func = fptr;
} else {
if (virt_control_chan_func)
atomic_dec(&uisutils_registered_services);
virt_control_chan_func = NULL;
}
break;
default:
LOGERR("invalid type %d.\n", type);
return 0;
}
if (chipset_driver_info)
bus_device_info_init(chipset_driver_info, "chipset", "uislib",
VERSION, NULL);
return 1;
}
EXPORT_SYMBOL_GPL(uisctrl_register_req_handler);
int
uisctrl_register_req_handler_ex(uuid_le switch_uuid,
const char *switch_type_name,
int (*controlfunc)(struct io_msgs *),
unsigned long min_channel_bytes,
int (*server_channel_ok)(unsigned long channel_bytes),
int (*server_channel_init)(void *x,
unsigned char *client_str,
u32 client_str_len, u64 bytes),
struct ultra_vbus_deviceinfo *chipset_driver_info)
{
struct req_handler_info *pReqHandlerInfo;
int rc = 0; /* assume failure */
LOGINF("type=%pUL, controlfunc=0x%p.\n",
&switch_uuid, controlfunc);
if (!controlfunc) {
LOGERR("%pUL: controlfunc must be supplied\n", &switch_uuid);
goto Away;
}
if (!server_channel_ok) {
LOGERR("%pUL: Server_Channel_Ok must be supplied\n",
&switch_uuid);
goto Away;
}
if (!server_channel_init) {
LOGERR("%pUL: Server_Channel_Init must be supplied\n",
&switch_uuid);
goto Away;
}
pReqHandlerInfo = req_handler_add(switch_uuid,
switch_type_name,
controlfunc,
min_channel_bytes,
server_channel_ok, server_channel_init);
if (!pReqHandlerInfo) {
LOGERR("failed to add %pUL to server list\n", &switch_uuid);
goto Away;
}
atomic_inc(&uisutils_registered_services);
rc = 1; /* success */
Away:
if (rc) {
if (chipset_driver_info)
bus_device_info_init(chipset_driver_info, "chipset",
"uislib", VERSION, NULL);
} else
LOGERR("failed to register type %pUL.\n", &switch_uuid);
return rc;
}
EXPORT_SYMBOL_GPL(uisctrl_register_req_handler_ex);
int
uisctrl_unregister_req_handler_ex(uuid_le switch_uuid)
{
int rc = 0; /* assume failure */
LOGINF("type=%pUL.\n", &switch_uuid);
if (req_handler_del(switch_uuid) < 0) {
LOGERR("failed to remove %pUL from server list\n",
&switch_uuid);
goto Away;
}
atomic_dec(&uisutils_registered_services);
rc = 1; /* success */
Away:
if (!rc)
LOGERR("failed to unregister type %pUL.\n", &switch_uuid);
return rc;
}
EXPORT_SYMBOL_GPL(uisctrl_unregister_req_handler_ex);
/*
* unsigned int uisutil_copy_fragsinfo_from_skb(unsigned char *calling_ctx,
* void *skb_in,
* unsigned int firstfraglen,
* unsigned int frags_max,
* struct phys_info frags[])
*
* calling_ctx - input - a string that is displayed to show
* who called * this func
* void *skb_in - skb whose frag info we're copying type is hidden so we
* don't need to include skbbuff in uisutils.h which is
* included in non-networking code.
* unsigned int firstfraglen - input - length of first fragment in skb
* unsigned int frags_max - input - max len of frags array
* struct phys_info frags[] - output - frags array filled in on output
* return value indicates number of
* entries filled in frags
*/
unsigned int
uisutil_copy_fragsinfo_from_skb(unsigned char *calling_ctx, void *skb_in,
unsigned int firstfraglen,
unsigned int frags_max,
struct phys_info frags[])
{
unsigned int count = 0, ii, size, offset = 0, numfrags;
struct sk_buff *skb = skb_in;
numfrags = skb_shinfo(skb)->nr_frags;
while (firstfraglen) {
if (count == frags_max) {
LOGERR("%s frags array too small: max:%d count:%d\n",
calling_ctx, frags_max, count);
return -1; /* failure */
}
frags[count].pi_pfn =
page_to_pfn(virt_to_page(skb->data + offset));
frags[count].pi_off =
(unsigned long) (skb->data + offset) & PI_PAGE_MASK;
size =
min(firstfraglen,
(unsigned int) (PI_PAGE_SIZE - frags[count].pi_off));
/* can take smallest of firstfraglen(what's left) OR
* bytes left in the page
*/
frags[count].pi_len = size;
firstfraglen -= size;
offset += size;
count++;
}
if (!numfrags)
goto dolist;
if ((count + numfrags) > frags_max) {
LOGERR("**** FAILED %s frags array too small: max:%d count+nr_frags:%d\n",
calling_ctx, frags_max, count + numfrags);
return -1; /* failure */
}
for (ii = 0; ii < numfrags; ii++) {
count = add_physinfo_entries(page_to_pfn(
skb_frag_page(&skb_shinfo(skb)->frags[ii])),
skb_shinfo(skb)->frags[ii].
page_offset,
skb_shinfo(skb)->frags[ii].
size, count, frags_max,
frags);
if (count == 0) {
LOGERR("**** FAILED to add physinfo entries\n");
return -1; /* failure */
}
}
dolist: if (skb_shinfo(skb)->frag_list) {
struct sk_buff *skbinlist;
int c;
for (skbinlist = skb_shinfo(skb)->frag_list; skbinlist;
skbinlist = skbinlist->next) {
c = uisutil_copy_fragsinfo_from_skb("recursive",
skbinlist,
skbinlist->len - skbinlist->data_len,
frags_max - count,
&frags[count]);
if (c == -1) {
LOGERR("**** FAILED recursive call failed\n");
return -1;
}
count += c;
}
}
return count;
}
EXPORT_SYMBOL_GPL(uisutil_copy_fragsinfo_from_skb);
static LIST_HEAD(ReqHandlerInfo_list); /* list of struct req_handler_info */
static DEFINE_SPINLOCK(ReqHandlerInfo_list_lock);
struct req_handler_info *
req_handler_add(uuid_le switch_uuid,
const char *switch_type_name,
int (*controlfunc)(struct io_msgs *),
unsigned long min_channel_bytes,
int (*Server_Channel_Ok)(unsigned long channelBytes),
int (*Server_Channel_Init)
(void *x, unsigned char *clientStr, u32 clientStrLen, u64 bytes))
{
struct req_handler_info *rc = NULL;
rc = kzalloc(sizeof(*rc), GFP_ATOMIC);
if (!rc)
return NULL;
rc->switch_uuid = switch_uuid;
rc->controlfunc = controlfunc;
rc->min_channel_bytes = min_channel_bytes;
rc->server_channel_ok = Server_Channel_Ok;
rc->server_channel_init = Server_Channel_Init;
if (switch_type_name)
strncpy(rc->switch_type_name, switch_type_name,
sizeof(rc->switch_type_name) - 1);
spin_lock(&ReqHandlerInfo_list_lock);
list_add_tail(&(rc->list_link), &ReqHandlerInfo_list);
spin_unlock(&ReqHandlerInfo_list_lock);
return rc;
}
struct req_handler_info *
req_handler_find(uuid_le switch_uuid)
{
struct list_head *lelt, *tmp;
struct req_handler_info *entry = NULL;
spin_lock(&ReqHandlerInfo_list_lock);
list_for_each_safe(lelt, tmp, &ReqHandlerInfo_list) {
entry = list_entry(lelt, struct req_handler_info, list_link);
if (uuid_le_cmp(entry->switch_uuid, switch_uuid) == 0) {
spin_unlock(&ReqHandlerInfo_list_lock);
return entry;
}
}
spin_unlock(&ReqHandlerInfo_list_lock);
return NULL;
}
int
req_handler_del(uuid_le switch_uuid)
{
struct list_head *lelt, *tmp;
struct req_handler_info *entry = NULL;
int rc = -1;
spin_lock(&ReqHandlerInfo_list_lock);
list_for_each_safe(lelt, tmp, &ReqHandlerInfo_list) {
entry = list_entry(lelt, struct req_handler_info, list_link);
if (uuid_le_cmp(entry->switch_uuid, switch_uuid) == 0) {
list_del(lelt);
kfree(entry);
rc++;
}
}
spin_unlock(&ReqHandlerInfo_list_lock);
return rc;
}
|