linux/drivers/uwb/drp-ie.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

319 lines
9.5 KiB
C

/*
* UWB DRP IE management.
*
* Copyright (C) 2005-2006 Intel Corporation
* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/uwb.h>
#include "uwb-internal.h"
/*
* Return the reason code for a reservations's DRP IE.
*/
int uwb_rsv_reason_code(struct uwb_rsv *rsv)
{
static const int reason_codes[] = {
[UWB_RSV_STATE_O_INITIATED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_PENDING] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_MODIFIED] = UWB_DRP_REASON_MODIFIED,
[UWB_RSV_STATE_O_ESTABLISHED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_TO_BE_MOVED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_O_MOVE_COMBINING] = UWB_DRP_REASON_MODIFIED,
[UWB_RSV_STATE_O_MOVE_REDUCING] = UWB_DRP_REASON_MODIFIED,
[UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_CONFLICT] = UWB_DRP_REASON_CONFLICT,
[UWB_RSV_STATE_T_PENDING] = UWB_DRP_REASON_PENDING,
[UWB_RSV_STATE_T_DENIED] = UWB_DRP_REASON_DENIED,
[UWB_RSV_STATE_T_RESIZED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
};
return reason_codes[rsv->state];
}
/*
* Return the reason code for a reservations's companion DRP IE .
*/
int uwb_rsv_companion_reason_code(struct uwb_rsv *rsv)
{
static const int companion_reason_codes[] = {
[UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
};
return companion_reason_codes[rsv->state];
}
/*
* Return the status bit for a reservations's DRP IE.
*/
int uwb_rsv_status(struct uwb_rsv *rsv)
{
static const int statuses[] = {
[UWB_RSV_STATE_O_INITIATED] = 0,
[UWB_RSV_STATE_O_PENDING] = 0,
[UWB_RSV_STATE_O_MODIFIED] = 1,
[UWB_RSV_STATE_O_ESTABLISHED] = 1,
[UWB_RSV_STATE_O_TO_BE_MOVED] = 0,
[UWB_RSV_STATE_O_MOVE_COMBINING] = 1,
[UWB_RSV_STATE_O_MOVE_REDUCING] = 1,
[UWB_RSV_STATE_O_MOVE_EXPANDING] = 1,
[UWB_RSV_STATE_T_ACCEPTED] = 1,
[UWB_RSV_STATE_T_CONFLICT] = 0,
[UWB_RSV_STATE_T_PENDING] = 0,
[UWB_RSV_STATE_T_DENIED] = 0,
[UWB_RSV_STATE_T_RESIZED] = 1,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 1,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = 1,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = 1,
};
return statuses[rsv->state];
}
/*
* Return the status bit for a reservations's companion DRP IE .
*/
int uwb_rsv_companion_status(struct uwb_rsv *rsv)
{
static const int companion_statuses[] = {
[UWB_RSV_STATE_O_MOVE_EXPANDING] = 0,
[UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
[UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 0,
[UWB_RSV_STATE_T_EXPANDING_PENDING] = 0,
[UWB_RSV_STATE_T_EXPANDING_DENIED] = 0,
};
return companion_statuses[rsv->state];
}
/*
* Allocate a DRP IE.
*
* To save having to free/allocate a DRP IE when its MAS changes,
* enough memory is allocated for the maxiumum number of DRP
* allocation fields. This gives an overhead per reservation of up to
* (UWB_NUM_ZONES - 1) * 4 = 60 octets.
*/
static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
{
struct uwb_ie_drp *drp_ie;
drp_ie = kzalloc(sizeof(struct uwb_ie_drp) +
UWB_NUM_ZONES * sizeof(struct uwb_drp_alloc),
GFP_KERNEL);
if (drp_ie) {
drp_ie->hdr.element_id = UWB_IE_DRP;
}
return drp_ie;
}
/*
* Fill a DRP IE's allocation fields from a MAS bitmap.
*/
static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
struct uwb_mas_bm *mas)
{
int z, i, num_fields = 0, next = 0;
struct uwb_drp_alloc *zones;
__le16 current_bmp;
DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);
zones = drp_ie->allocs;
bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);
/* Determine unique MAS bitmaps in zones from bitmap. */
for (z = 0; z < UWB_NUM_ZONES; z++) {
bitmap_copy(tmp_mas_bm, tmp_bmp, UWB_MAS_PER_ZONE);
if (bitmap_weight(tmp_mas_bm, UWB_MAS_PER_ZONE) > 0) {
bool found = false;
current_bmp = (__le16) *tmp_mas_bm;
for (i = 0; i < next; i++) {
if (current_bmp == zones[i].mas_bm) {
zones[i].zone_bm |= 1 << z;
found = true;
break;
}
}
if (!found) {
num_fields++;
zones[next].zone_bm = 1 << z;
zones[next].mas_bm = current_bmp;
next++;
}
}
bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
}
/* Store in format ready for transmission (le16). */
for (i = 0; i < num_fields; i++) {
drp_ie->allocs[i].zone_bm = cpu_to_le16(zones[i].zone_bm);
drp_ie->allocs[i].mas_bm = cpu_to_le16(zones[i].mas_bm);
}
drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
+ num_fields * sizeof(struct uwb_drp_alloc);
}
/**
* uwb_drp_ie_update - update a reservation's DRP IE
* @rsv: the reservation
*/
int uwb_drp_ie_update(struct uwb_rsv *rsv)
{
struct uwb_ie_drp *drp_ie;
struct uwb_rsv_move *mv;
int unsafe;
if (rsv->state == UWB_RSV_STATE_NONE) {
kfree(rsv->drp_ie);
rsv->drp_ie = NULL;
return 0;
}
unsafe = rsv->mas.unsafe ? 1 : 0;
if (rsv->drp_ie == NULL) {
rsv->drp_ie = uwb_drp_ie_alloc();
if (rsv->drp_ie == NULL)
return -ENOMEM;
}
drp_ie = rsv->drp_ie;
uwb_ie_drp_set_unsafe(drp_ie, unsafe);
uwb_ie_drp_set_tiebreaker(drp_ie, rsv->tiebreaker);
uwb_ie_drp_set_owner(drp_ie, uwb_rsv_is_owner(rsv));
uwb_ie_drp_set_status(drp_ie, uwb_rsv_status(rsv));
uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_reason_code(rsv));
uwb_ie_drp_set_stream_index(drp_ie, rsv->stream);
uwb_ie_drp_set_type(drp_ie, rsv->type);
if (uwb_rsv_is_owner(rsv)) {
switch (rsv->target.type) {
case UWB_RSV_TARGET_DEV:
drp_ie->dev_addr = rsv->target.dev->dev_addr;
break;
case UWB_RSV_TARGET_DEVADDR:
drp_ie->dev_addr = rsv->target.devaddr;
break;
}
} else
drp_ie->dev_addr = rsv->owner->dev_addr;
uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
if (uwb_rsv_has_two_drp_ies(rsv)) {
mv = &rsv->mv;
if (mv->companion_drp_ie == NULL) {
mv->companion_drp_ie = uwb_drp_ie_alloc();
if (mv->companion_drp_ie == NULL)
return -ENOMEM;
}
drp_ie = mv->companion_drp_ie;
/* keep all the same configuration of the main drp_ie */
memcpy(drp_ie, rsv->drp_ie, sizeof(struct uwb_ie_drp));
/* FIXME: handle properly the unsafe bit */
uwb_ie_drp_set_unsafe(drp_ie, 1);
uwb_ie_drp_set_status(drp_ie, uwb_rsv_companion_status(rsv));
uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_companion_reason_code(rsv));
uwb_drp_ie_from_bm(drp_ie, &mv->companion_mas);
}
rsv->ie_valid = true;
return 0;
}
/*
* Set MAS bits from given MAS bitmap in a single zone of large bitmap.
*
* We are given a zone id and the MAS bitmap of bits that need to be set in
* this zone. Note that this zone may already have bits set and this only
* adds settings - we cannot simply assign the MAS bitmap contents to the
* zone contents. We iterate over the the bits (MAS) in the zone and set the
* bits that are set in the given MAS bitmap.
*/
static
void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
{
int mas;
u16 mas_mask;
for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
mas_mask = 1 << mas;
if (mas_bm & mas_mask)
set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
}
}
/**
* uwb_drp_ie_zones_to_bm - convert DRP allocation fields to a bitmap
* @mas: MAS bitmap that will be populated to correspond to the
* allocation fields in the DRP IE
* @drp_ie: the DRP IE that contains the allocation fields.
*
* The input format is an array of MAS allocation fields (16 bit Zone
* bitmap, 16 bit MAS bitmap) as described in [ECMA-368] section
* 16.8.6. The output is a full 256 bit MAS bitmap.
*
* We go over all the allocation fields, for each allocation field we
* know which zones are impacted. We iterate over all the zones
* impacted and call a function that will set the correct MAS bits in
* each zone.
*/
void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
{
int numallocs = (drp_ie->hdr.length - 4) / 4;
const struct uwb_drp_alloc *alloc;
int cnt;
u16 zone_bm, mas_bm;
u8 zone;
u16 zone_mask;
bitmap_zero(bm->bm, UWB_NUM_MAS);
for (cnt = 0; cnt < numallocs; cnt++) {
alloc = &drp_ie->allocs[cnt];
zone_bm = le16_to_cpu(alloc->zone_bm);
mas_bm = le16_to_cpu(alloc->mas_bm);
for (zone = 0; zone < UWB_NUM_ZONES; zone++) {
zone_mask = 1 << zone;
if (zone_bm & zone_mask)
uwb_drp_ie_single_zone_to_bm(bm, zone, mas_bm);
}
}
}