mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Andy Shevchenko](/assets/img/avatar_default.png)
In kernel we have nice specifier %*ph to dump small buffers. Let's use it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
466 lines
13 KiB
C
466 lines
13 KiB
C
/*
|
|
* Ultra Wide Band Radio Control
|
|
* Event Size Tables management
|
|
*
|
|
* Copyright (C) 2005-2006 Intel Corporation
|
|
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*
|
|
*
|
|
* FIXME: docs
|
|
*
|
|
* Infrastructure, code and data tables for guessing the size of
|
|
* events received on the notification endpoints of UWB radio
|
|
* controllers.
|
|
*
|
|
* You define a table of events and for each, its size and how to get
|
|
* the extra size.
|
|
*
|
|
* ENTRY POINTS:
|
|
*
|
|
* uwb_est_{init/destroy}(): To initialize/release the EST subsystem.
|
|
*
|
|
* uwb_est_[u]register(): To un/register event size tables
|
|
* uwb_est_grow()
|
|
*
|
|
* uwb_est_find_size(): Get the size of an event
|
|
* uwb_est_get_size()
|
|
*/
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/export.h>
|
|
|
|
#include "uwb-internal.h"
|
|
|
|
struct uwb_est {
|
|
u16 type_event_high;
|
|
u16 vendor, product;
|
|
u8 entries;
|
|
const struct uwb_est_entry *entry;
|
|
};
|
|
|
|
static struct uwb_est *uwb_est;
|
|
static u8 uwb_est_size;
|
|
static u8 uwb_est_used;
|
|
static DEFINE_RWLOCK(uwb_est_lock);
|
|
|
|
/**
|
|
* WUSB Standard Event Size Table, HWA-RC interface
|
|
*
|
|
* Sizes for events and notifications type 0 (general), high nibble 0.
|
|
*/
|
|
static
|
|
struct uwb_est_entry uwb_est_00_00xx[] = {
|
|
[UWB_RC_EVT_IE_RCV] = {
|
|
.size = sizeof(struct uwb_rc_evt_ie_rcv),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_ie_rcv, wIELength),
|
|
},
|
|
[UWB_RC_EVT_BEACON] = {
|
|
.size = sizeof(struct uwb_rc_evt_beacon),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_beacon, wBeaconInfoLength),
|
|
},
|
|
[UWB_RC_EVT_BEACON_SIZE] = {
|
|
.size = sizeof(struct uwb_rc_evt_beacon_size),
|
|
},
|
|
[UWB_RC_EVT_BPOIE_CHANGE] = {
|
|
.size = sizeof(struct uwb_rc_evt_bpoie_change),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_bpoie_change,
|
|
wBPOIELength),
|
|
},
|
|
[UWB_RC_EVT_BP_SLOT_CHANGE] = {
|
|
.size = sizeof(struct uwb_rc_evt_bp_slot_change),
|
|
},
|
|
[UWB_RC_EVT_BP_SWITCH_IE_RCV] = {
|
|
.size = sizeof(struct uwb_rc_evt_bp_switch_ie_rcv),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_bp_switch_ie_rcv, wIELength),
|
|
},
|
|
[UWB_RC_EVT_DEV_ADDR_CONFLICT] = {
|
|
.size = sizeof(struct uwb_rc_evt_dev_addr_conflict),
|
|
},
|
|
[UWB_RC_EVT_DRP_AVAIL] = {
|
|
.size = sizeof(struct uwb_rc_evt_drp_avail)
|
|
},
|
|
[UWB_RC_EVT_DRP] = {
|
|
.size = sizeof(struct uwb_rc_evt_drp),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_drp, ie_length),
|
|
},
|
|
[UWB_RC_EVT_BP_SWITCH_STATUS] = {
|
|
.size = sizeof(struct uwb_rc_evt_bp_switch_status),
|
|
},
|
|
[UWB_RC_EVT_CMD_FRAME_RCV] = {
|
|
.size = sizeof(struct uwb_rc_evt_cmd_frame_rcv),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_cmd_frame_rcv, dataLength),
|
|
},
|
|
[UWB_RC_EVT_CHANNEL_CHANGE_IE_RCV] = {
|
|
.size = sizeof(struct uwb_rc_evt_channel_change_ie_rcv),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_channel_change_ie_rcv, wIELength),
|
|
},
|
|
[UWB_RC_CMD_CHANNEL_CHANGE] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_DEV_ADDR_MGMT] = {
|
|
.size = sizeof(struct uwb_rc_evt_dev_addr_mgmt) },
|
|
[UWB_RC_CMD_GET_IE] = {
|
|
.size = sizeof(struct uwb_rc_evt_get_ie),
|
|
.offset = 1 + offsetof(struct uwb_rc_evt_get_ie, wIELength),
|
|
},
|
|
[UWB_RC_CMD_RESET] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SCAN] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SET_BEACON_FILTER] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SET_DRP_IE] = {
|
|
.size = sizeof(struct uwb_rc_evt_set_drp_ie),
|
|
},
|
|
[UWB_RC_CMD_SET_IE] = {
|
|
.size = sizeof(struct uwb_rc_evt_set_ie),
|
|
},
|
|
[UWB_RC_CMD_SET_NOTIFICATION_FILTER] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SET_TX_POWER] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SLEEP] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_START_BEACON] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_STOP_BEACON] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_BP_MERGE] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SEND_COMMAND_FRAME] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
[UWB_RC_CMD_SET_ASIE_NOTIF] = {
|
|
.size = sizeof(struct uwb_rc_evt_confirm),
|
|
},
|
|
};
|
|
|
|
static
|
|
struct uwb_est_entry uwb_est_01_00xx[] = {
|
|
[UWB_RC_DAA_ENERGY_DETECTED] = {
|
|
.size = sizeof(struct uwb_rc_evt_daa_energy_detected),
|
|
},
|
|
[UWB_RC_SET_DAA_ENERGY_MASK] = {
|
|
.size = sizeof(struct uwb_rc_evt_set_daa_energy_mask),
|
|
},
|
|
[UWB_RC_SET_NOTIFICATION_FILTER_EX] = {
|
|
.size = sizeof(struct uwb_rc_evt_set_notification_filter_ex),
|
|
},
|
|
};
|
|
|
|
/**
|
|
* Initialize the EST subsystem
|
|
*
|
|
* Register the standard tables also.
|
|
*
|
|
* FIXME: tag init
|
|
*/
|
|
int uwb_est_create(void)
|
|
{
|
|
int result;
|
|
|
|
uwb_est_size = 2;
|
|
uwb_est_used = 0;
|
|
uwb_est = kcalloc(uwb_est_size, sizeof(uwb_est[0]), GFP_KERNEL);
|
|
if (uwb_est == NULL)
|
|
return -ENOMEM;
|
|
|
|
result = uwb_est_register(UWB_RC_CET_GENERAL, 0, 0xffff, 0xffff,
|
|
uwb_est_00_00xx, ARRAY_SIZE(uwb_est_00_00xx));
|
|
if (result < 0)
|
|
goto out;
|
|
result = uwb_est_register(UWB_RC_CET_EX_TYPE_1, 0, 0xffff, 0xffff,
|
|
uwb_est_01_00xx, ARRAY_SIZE(uwb_est_01_00xx));
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
|
|
/** Clean it up */
|
|
void uwb_est_destroy(void)
|
|
{
|
|
kfree(uwb_est);
|
|
uwb_est = NULL;
|
|
uwb_est_size = uwb_est_used = 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Double the capacity of the EST table
|
|
*
|
|
* @returns 0 if ok, < 0 errno no error.
|
|
*/
|
|
static
|
|
int uwb_est_grow(void)
|
|
{
|
|
size_t actual_size = uwb_est_size * sizeof(uwb_est[0]);
|
|
void *new = kmalloc(2 * actual_size, GFP_ATOMIC);
|
|
if (new == NULL)
|
|
return -ENOMEM;
|
|
memcpy(new, uwb_est, actual_size);
|
|
memset(new + actual_size, 0, actual_size);
|
|
kfree(uwb_est);
|
|
uwb_est = new;
|
|
uwb_est_size *= 2;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Register an event size table
|
|
*
|
|
* Makes room for it if the table is full, and then inserts it in the
|
|
* right position (entries are sorted by type, event_high, vendor and
|
|
* then product).
|
|
*
|
|
* @vendor: vendor code for matching against the device (0x0000 and
|
|
* 0xffff mean any); use 0x0000 to force all to match without
|
|
* checking possible vendor specific ones, 0xfffff to match
|
|
* after checking vendor specific ones.
|
|
*
|
|
* @product: product code from that vendor; same matching rules, use
|
|
* 0x0000 for not allowing vendor specific matches, 0xffff
|
|
* for allowing.
|
|
*
|
|
* This arragement just makes the tables sort differenty. Because the
|
|
* table is sorted by growing type-event_high-vendor-product, a zero
|
|
* vendor will match before than a 0x456a vendor, that will match
|
|
* before a 0xfffff vendor.
|
|
*
|
|
* @returns 0 if ok, < 0 errno on error (-ENOENT if not found).
|
|
*/
|
|
/* FIXME: add bus type to vendor/product code */
|
|
int uwb_est_register(u8 type, u8 event_high, u16 vendor, u16 product,
|
|
const struct uwb_est_entry *entry, size_t entries)
|
|
{
|
|
unsigned long flags;
|
|
unsigned itr;
|
|
u16 type_event_high;
|
|
int result = 0;
|
|
|
|
write_lock_irqsave(&uwb_est_lock, flags);
|
|
if (uwb_est_used == uwb_est_size) {
|
|
result = uwb_est_grow();
|
|
if (result < 0)
|
|
goto out;
|
|
}
|
|
/* Find the right spot to insert it in */
|
|
type_event_high = type << 8 | event_high;
|
|
for (itr = 0; itr < uwb_est_used; itr++)
|
|
if (uwb_est[itr].type_event_high < type
|
|
&& uwb_est[itr].vendor < vendor
|
|
&& uwb_est[itr].product < product)
|
|
break;
|
|
|
|
/* Shift others to make room for the new one? */
|
|
if (itr < uwb_est_used)
|
|
memmove(&uwb_est[itr+1], &uwb_est[itr], uwb_est_used - itr);
|
|
uwb_est[itr].type_event_high = type << 8 | event_high;
|
|
uwb_est[itr].vendor = vendor;
|
|
uwb_est[itr].product = product;
|
|
uwb_est[itr].entry = entry;
|
|
uwb_est[itr].entries = entries;
|
|
uwb_est_used++;
|
|
out:
|
|
write_unlock_irqrestore(&uwb_est_lock, flags);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_est_register);
|
|
|
|
|
|
/**
|
|
* Unregister an event size table
|
|
*
|
|
* This just removes the specified entry and moves the ones after it
|
|
* to fill in the gap. This is needed to keep the list sorted; no
|
|
* reallocation is done to reduce the size of the table.
|
|
*
|
|
* We unregister by all the data we used to register instead of by
|
|
* pointer to the @entry array because we might have used the same
|
|
* table for a bunch of IDs (for example).
|
|
*
|
|
* @returns 0 if ok, < 0 errno on error (-ENOENT if not found).
|
|
*/
|
|
int uwb_est_unregister(u8 type, u8 event_high, u16 vendor, u16 product,
|
|
const struct uwb_est_entry *entry, size_t entries)
|
|
{
|
|
unsigned long flags;
|
|
unsigned itr;
|
|
struct uwb_est est_cmp = {
|
|
.type_event_high = type << 8 | event_high,
|
|
.vendor = vendor,
|
|
.product = product,
|
|
.entry = entry,
|
|
.entries = entries
|
|
};
|
|
write_lock_irqsave(&uwb_est_lock, flags);
|
|
for (itr = 0; itr < uwb_est_used; itr++)
|
|
if (!memcmp(&uwb_est[itr], &est_cmp, sizeof(est_cmp)))
|
|
goto found;
|
|
write_unlock_irqrestore(&uwb_est_lock, flags);
|
|
return -ENOENT;
|
|
|
|
found:
|
|
if (itr < uwb_est_used - 1) /* Not last one? move ones above */
|
|
memmove(&uwb_est[itr], &uwb_est[itr+1], uwb_est_used - itr - 1);
|
|
uwb_est_used--;
|
|
write_unlock_irqrestore(&uwb_est_lock, flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_est_unregister);
|
|
|
|
|
|
/**
|
|
* Get the size of an event from a table
|
|
*
|
|
* @rceb: pointer to the buffer with the event
|
|
* @rceb_size: size of the area pointed to by @rceb in bytes.
|
|
* @returns: > 0 Size of the event
|
|
* -ENOSPC An area big enough was not provided to look
|
|
* ahead into the event's guts and guess the size.
|
|
* -EINVAL Unknown event code (wEvent).
|
|
*
|
|
* This will look at the received RCEB and guess what is the total
|
|
* size. For variable sized events, it will look further ahead into
|
|
* their length field to see how much data should be read.
|
|
*
|
|
* Note this size is *not* final--the neh (Notification/Event Handle)
|
|
* might specificy an extra size to add.
|
|
*/
|
|
static
|
|
ssize_t uwb_est_get_size(struct uwb_rc *uwb_rc, struct uwb_est *est,
|
|
u8 event_low, const struct uwb_rceb *rceb,
|
|
size_t rceb_size)
|
|
{
|
|
unsigned offset;
|
|
ssize_t size;
|
|
struct device *dev = &uwb_rc->uwb_dev.dev;
|
|
const struct uwb_est_entry *entry;
|
|
|
|
size = -ENOENT;
|
|
if (event_low >= est->entries) { /* in range? */
|
|
dev_err(dev, "EST %p 0x%04x/%04x/%04x[%u]: event %u out of range\n",
|
|
est, est->type_event_high, est->vendor, est->product,
|
|
est->entries, event_low);
|
|
goto out;
|
|
}
|
|
size = -ENOENT;
|
|
entry = &est->entry[event_low];
|
|
if (entry->size == 0 && entry->offset == 0) { /* unknown? */
|
|
dev_err(dev, "EST %p 0x%04x/%04x/%04x[%u]: event %u unknown\n",
|
|
est, est->type_event_high, est->vendor, est->product,
|
|
est->entries, event_low);
|
|
goto out;
|
|
}
|
|
offset = entry->offset; /* extra fries with that? */
|
|
if (offset == 0)
|
|
size = entry->size;
|
|
else {
|
|
/* Ops, got an extra size field at 'offset'--read it */
|
|
const void *ptr = rceb;
|
|
size_t type_size = 0;
|
|
offset--;
|
|
size = -ENOSPC; /* enough data for more? */
|
|
switch (entry->type) {
|
|
case UWB_EST_16: type_size = sizeof(__le16); break;
|
|
case UWB_EST_8: type_size = sizeof(u8); break;
|
|
default: BUG();
|
|
}
|
|
if (offset + type_size > rceb_size) {
|
|
dev_err(dev, "EST %p 0x%04x/%04x/%04x[%u]: "
|
|
"not enough data to read extra size\n",
|
|
est, est->type_event_high, est->vendor,
|
|
est->product, est->entries);
|
|
goto out;
|
|
}
|
|
size = entry->size;
|
|
ptr += offset;
|
|
switch (entry->type) {
|
|
case UWB_EST_16: size += le16_to_cpu(*(__le16 *)ptr); break;
|
|
case UWB_EST_8: size += *(u8 *)ptr; break;
|
|
default: BUG();
|
|
}
|
|
}
|
|
out:
|
|
return size;
|
|
}
|
|
|
|
|
|
/**
|
|
* Guesses the size of a WA event
|
|
*
|
|
* @rceb: pointer to the buffer with the event
|
|
* @rceb_size: size of the area pointed to by @rceb in bytes.
|
|
* @returns: > 0 Size of the event
|
|
* -ENOSPC An area big enough was not provided to look
|
|
* ahead into the event's guts and guess the size.
|
|
* -EINVAL Unknown event code (wEvent).
|
|
*
|
|
* This will look at the received RCEB and guess what is the total
|
|
* size by checking all the tables registered with
|
|
* uwb_est_register(). For variable sized events, it will look further
|
|
* ahead into their length field to see how much data should be read.
|
|
*
|
|
* Note this size is *not* final--the neh (Notification/Event Handle)
|
|
* might specificy an extra size to add or replace.
|
|
*/
|
|
ssize_t uwb_est_find_size(struct uwb_rc *rc, const struct uwb_rceb *rceb,
|
|
size_t rceb_size)
|
|
{
|
|
/* FIXME: add vendor/product data */
|
|
ssize_t size;
|
|
struct device *dev = &rc->uwb_dev.dev;
|
|
unsigned long flags;
|
|
unsigned itr;
|
|
u16 type_event_high, event;
|
|
|
|
read_lock_irqsave(&uwb_est_lock, flags);
|
|
size = -ENOSPC;
|
|
if (rceb_size < sizeof(*rceb))
|
|
goto out;
|
|
event = le16_to_cpu(rceb->wEvent);
|
|
type_event_high = rceb->bEventType << 8 | (event & 0xff00) >> 8;
|
|
for (itr = 0; itr < uwb_est_used; itr++) {
|
|
if (uwb_est[itr].type_event_high != type_event_high)
|
|
continue;
|
|
size = uwb_est_get_size(rc, &uwb_est[itr],
|
|
event & 0x00ff, rceb, rceb_size);
|
|
/* try more tables that might handle the same type */
|
|
if (size != -ENOENT)
|
|
goto out;
|
|
}
|
|
dev_dbg(dev,
|
|
"event 0x%02x/%04x/%02x: no handlers available; RCEB %4ph\n",
|
|
(unsigned) rceb->bEventType,
|
|
(unsigned) le16_to_cpu(rceb->wEvent),
|
|
(unsigned) rceb->bEventContext,
|
|
rceb);
|
|
size = -ENOENT;
|
|
out:
|
|
read_unlock_irqrestore(&uwb_est_lock, flags);
|
|
return size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_est_find_size);
|