linux/drivers/usb/host/whci/asl.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

390 lines
9.5 KiB
C

/*
* Wireless Host Controller (WHC) asynchronous schedule management.
*
* Copyright (C) 2007 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/gfp.h>
#include <linux/dma-mapping.h>
#include <linux/uwb/umc.h>
#include <linux/usb.h>
#include "../../wusbcore/wusbhc.h"
#include "whcd.h"
static void qset_get_next_prev(struct whc *whc, struct whc_qset *qset,
struct whc_qset **next, struct whc_qset **prev)
{
struct list_head *n, *p;
BUG_ON(list_empty(&whc->async_list));
n = qset->list_node.next;
if (n == &whc->async_list)
n = n->next;
p = qset->list_node.prev;
if (p == &whc->async_list)
p = p->prev;
*next = container_of(n, struct whc_qset, list_node);
*prev = container_of(p, struct whc_qset, list_node);
}
static void asl_qset_insert_begin(struct whc *whc, struct whc_qset *qset)
{
list_move(&qset->list_node, &whc->async_list);
qset->in_sw_list = true;
}
static void asl_qset_insert(struct whc *whc, struct whc_qset *qset)
{
struct whc_qset *next, *prev;
qset_clear(whc, qset);
/* Link into ASL. */
qset_get_next_prev(whc, qset, &next, &prev);
whc_qset_set_link_ptr(&qset->qh.link, next->qset_dma);
whc_qset_set_link_ptr(&prev->qh.link, qset->qset_dma);
qset->in_hw_list = true;
}
static void asl_qset_remove(struct whc *whc, struct whc_qset *qset)
{
struct whc_qset *prev, *next;
qset_get_next_prev(whc, qset, &next, &prev);
list_move(&qset->list_node, &whc->async_removed_list);
qset->in_sw_list = false;
/*
* No more qsets in the ASL? The caller must stop the ASL as
* it's no longer valid.
*/
if (list_empty(&whc->async_list))
return;
/* Remove from ASL. */
whc_qset_set_link_ptr(&prev->qh.link, next->qset_dma);
qset->in_hw_list = false;
}
/**
* process_qset - process any recently inactivated or halted qTDs in a
* qset.
*
* After inactive qTDs are removed, new qTDs can be added if the
* urb queue still contains URBs.
*
* Returns any additional WUSBCMD bits for the ASL sync command (i.e.,
* WUSBCMD_ASYNC_QSET_RM if a halted qset was removed).
*/
static uint32_t process_qset(struct whc *whc, struct whc_qset *qset)
{
enum whc_update update = 0;
uint32_t status = 0;
while (qset->ntds) {
struct whc_qtd *td;
int t;
t = qset->td_start;
td = &qset->qtd[qset->td_start];
status = le32_to_cpu(td->status);
/*
* Nothing to do with a still active qTD.
*/
if (status & QTD_STS_ACTIVE)
break;
if (status & QTD_STS_HALTED) {
/* Ug, an error. */
process_halted_qtd(whc, qset, td);
/* A halted qTD always triggers an update
because the qset was either removed or
reactivated. */
update |= WHC_UPDATE_UPDATED;
goto done;
}
/* Mmm, a completed qTD. */
process_inactive_qtd(whc, qset, td);
}
if (!qset->remove)
update |= qset_add_qtds(whc, qset);
done:
/*
* Remove this qset from the ASL if requested, but only if has
* no qTDs.
*/
if (qset->remove && qset->ntds == 0) {
asl_qset_remove(whc, qset);
update |= WHC_UPDATE_REMOVED;
}
return update;
}
void asl_start(struct whc *whc)
{
struct whc_qset *qset;
qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
le_writeq(qset->qset_dma | QH_LINK_NTDS(8), whc->base + WUSBASYNCLISTADDR);
whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, WUSBCMD_ASYNC_EN);
whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
WUSBSTS_ASYNC_SCHED, WUSBSTS_ASYNC_SCHED,
1000, "start ASL");
}
void asl_stop(struct whc *whc)
{
whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, 0);
whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
WUSBSTS_ASYNC_SCHED, 0,
1000, "stop ASL");
}
/**
* asl_update - request an ASL update and wait for the hardware to be synced
* @whc: the WHCI HC
* @wusbcmd: WUSBCMD value to start the update.
*
* If the WUSB HC is inactive (i.e., the ASL is stopped) then the
* update must be skipped as the hardware may not respond to update
* requests.
*/
void asl_update(struct whc *whc, uint32_t wusbcmd)
{
struct wusbhc *wusbhc = &whc->wusbhc;
long t;
mutex_lock(&wusbhc->mutex);
if (wusbhc->active) {
whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
t = wait_event_timeout(
whc->async_list_wq,
(le_readl(whc->base + WUSBCMD) & WUSBCMD_ASYNC_UPDATED) == 0,
msecs_to_jiffies(1000));
if (t == 0)
whc_hw_error(whc, "ASL update timeout");
}
mutex_unlock(&wusbhc->mutex);
}
/**
* scan_async_work - scan the ASL for qsets to process.
*
* Process each qset in the ASL in turn and then signal the WHC that
* the ASL has been updated.
*
* Then start, stop or update the asynchronous schedule as required.
*/
void scan_async_work(struct work_struct *work)
{
struct whc *whc = container_of(work, struct whc, async_work);
struct whc_qset *qset, *t;
enum whc_update update = 0;
spin_lock_irq(&whc->lock);
/*
* Transerve the software list backwards so new qsets can be
* safely inserted into the ASL without making it non-circular.
*/
list_for_each_entry_safe_reverse(qset, t, &whc->async_list, list_node) {
if (!qset->in_hw_list) {
asl_qset_insert(whc, qset);
update |= WHC_UPDATE_ADDED;
}
update |= process_qset(whc, qset);
}
spin_unlock_irq(&whc->lock);
if (update) {
uint32_t wusbcmd = WUSBCMD_ASYNC_UPDATED | WUSBCMD_ASYNC_SYNCED_DB;
if (update & WHC_UPDATE_REMOVED)
wusbcmd |= WUSBCMD_ASYNC_QSET_RM;
asl_update(whc, wusbcmd);
}
/*
* Now that the ASL is updated, complete the removal of any
* removed qsets.
*
* If the qset was to be reset, do so and reinsert it into the
* ASL if it has pending transfers.
*/
spin_lock_irq(&whc->lock);
list_for_each_entry_safe(qset, t, &whc->async_removed_list, list_node) {
qset_remove_complete(whc, qset);
if (qset->reset) {
qset_reset(whc, qset);
if (!list_empty(&qset->stds)) {
asl_qset_insert_begin(whc, qset);
queue_work(whc->workqueue, &whc->async_work);
}
}
}
spin_unlock_irq(&whc->lock);
}
/**
* asl_urb_enqueue - queue an URB onto the asynchronous list (ASL).
* @whc: the WHCI host controller
* @urb: the URB to enqueue
* @mem_flags: flags for any memory allocations
*
* The qset for the endpoint is obtained and the urb queued on to it.
*
* Work is scheduled to update the hardware's view of the ASL.
*/
int asl_urb_enqueue(struct whc *whc, struct urb *urb, gfp_t mem_flags)
{
struct whc_qset *qset;
int err;
unsigned long flags;
spin_lock_irqsave(&whc->lock, flags);
err = usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
if (err < 0) {
spin_unlock_irqrestore(&whc->lock, flags);
return err;
}
qset = get_qset(whc, urb, GFP_ATOMIC);
if (qset == NULL)
err = -ENOMEM;
else
err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
if (!err) {
if (!qset->in_sw_list && !qset->remove)
asl_qset_insert_begin(whc, qset);
} else
usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);
spin_unlock_irqrestore(&whc->lock, flags);
if (!err)
queue_work(whc->workqueue, &whc->async_work);
return err;
}
/**
* asl_urb_dequeue - remove an URB (qset) from the async list.
* @whc: the WHCI host controller
* @urb: the URB to dequeue
* @status: the current status of the URB
*
* URBs that do yet have qTDs can simply be removed from the software
* queue, otherwise the qset must be removed from the ASL so the qTDs
* can be removed.
*/
int asl_urb_dequeue(struct whc *whc, struct urb *urb, int status)
{
struct whc_urb *wurb = urb->hcpriv;
struct whc_qset *qset = wurb->qset;
struct whc_std *std, *t;
bool has_qtd = false;
int ret;
unsigned long flags;
spin_lock_irqsave(&whc->lock, flags);
ret = usb_hcd_check_unlink_urb(&whc->wusbhc.usb_hcd, urb, status);
if (ret < 0)
goto out;
list_for_each_entry_safe(std, t, &qset->stds, list_node) {
if (std->urb == urb) {
if (std->qtd)
has_qtd = true;
qset_free_std(whc, std);
} else
std->qtd = NULL; /* so this std is re-added when the qset is */
}
if (has_qtd) {
asl_qset_remove(whc, qset);
wurb->status = status;
wurb->is_async = true;
queue_work(whc->workqueue, &wurb->dequeue_work);
} else
qset_remove_urb(whc, qset, urb, status);
out:
spin_unlock_irqrestore(&whc->lock, flags);
return ret;
}
/**
* asl_qset_delete - delete a qset from the ASL
*/
void asl_qset_delete(struct whc *whc, struct whc_qset *qset)
{
qset->remove = 1;
queue_work(whc->workqueue, &whc->async_work);
qset_delete(whc, qset);
}
/**
* asl_init - initialize the asynchronous schedule list
*
* A dummy qset with no qTDs is added to the ASL to simplify removing
* qsets (no need to stop the ASL when the last qset is removed).
*/
int asl_init(struct whc *whc)
{
struct whc_qset *qset;
qset = qset_alloc(whc, GFP_KERNEL);
if (qset == NULL)
return -ENOMEM;
asl_qset_insert_begin(whc, qset);
asl_qset_insert(whc, qset);
return 0;
}
/**
* asl_clean_up - free ASL resources
*
* The ASL is stopped and empty except for the dummy qset.
*/
void asl_clean_up(struct whc *whc)
{
struct whc_qset *qset;
if (!list_empty(&whc->async_list)) {
qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
list_del(&qset->list_node);
qset_free(whc, qset);
}
}