linux/drivers/usb/wusbcore/wa-rpipe.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

530 lines
15 KiB
C

/*
* WUSB Wire Adapter
* rpipe 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
*
* RPIPE
*
* Targetted at different downstream endpoints
*
* Descriptor: use to config the remote pipe.
*
* The number of blocks could be dynamic (wBlocks in descriptor is
* 0)--need to schedule them then.
*
* Each bit in wa->rpipe_bm represents if an rpipe is being used or
* not. Rpipes are represented with a 'struct wa_rpipe' that is
* attached to the hcpriv member of a 'struct usb_host_endpoint'.
*
* When you need to xfer data to an endpoint, you get an rpipe for it
* with wa_ep_rpipe_get(), which gives you a reference to the rpipe
* and keeps a single one (the first one) with the endpoint. When you
* are done transferring, you drop that reference. At the end the
* rpipe is always allocated and bound to the endpoint. There it might
* be recycled when not used.
*
* Addresses:
*
* We use a 1:1 mapping mechanism between port address (0 based
* index, actually) and the address. The USB stack knows about this.
*
* USB Stack port number 4 (1 based)
* WUSB code port index 3 (0 based)
* USB Addresss 5 (2 based -- 0 is for default, 1 for root hub)
*
* Now, because we don't use the concept as default address exactly
* like the (wired) USB code does, we need to kind of skip it. So we
* never take addresses from the urb->pipe, but from the
* urb->dev->devnum, to make sure that we always have the right
* destination address.
*/
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
#include "wusbhc.h"
#include "wa-hc.h"
static int __rpipe_get_descr(struct wahc *wa,
struct usb_rpipe_descriptor *descr, u16 index)
{
ssize_t result;
struct device *dev = &wa->usb_iface->dev;
/* Get the RPIPE descriptor -- we cannot use the usb_get_descriptor()
* function because the arguments are different.
*/
result = usb_control_msg(
wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
USB_REQ_GET_DESCRIPTOR,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_RPIPE,
USB_DT_RPIPE<<8, index, descr, sizeof(*descr),
1000 /* FIXME: arbitrary */);
if (result < 0) {
dev_err(dev, "rpipe %u: get descriptor failed: %d\n",
index, (int)result);
goto error;
}
if (result < sizeof(*descr)) {
dev_err(dev, "rpipe %u: got short descriptor "
"(%zd vs %zd bytes needed)\n",
index, result, sizeof(*descr));
result = -EINVAL;
goto error;
}
result = 0;
error:
return result;
}
/*
*
* The descriptor is assumed to be properly initialized (ie: you got
* it through __rpipe_get_descr()).
*/
static int __rpipe_set_descr(struct wahc *wa,
struct usb_rpipe_descriptor *descr, u16 index)
{
ssize_t result;
struct device *dev = &wa->usb_iface->dev;
/* we cannot use the usb_get_descriptor() function because the
* arguments are different.
*/
result = usb_control_msg(
wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
USB_REQ_SET_DESCRIPTOR,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
USB_DT_RPIPE<<8, index, descr, sizeof(*descr),
HZ / 10);
if (result < 0) {
dev_err(dev, "rpipe %u: set descriptor failed: %d\n",
index, (int)result);
goto error;
}
if (result < sizeof(*descr)) {
dev_err(dev, "rpipe %u: sent short descriptor "
"(%zd vs %zd bytes required)\n",
index, result, sizeof(*descr));
result = -EINVAL;
goto error;
}
result = 0;
error:
return result;
}
static void rpipe_init(struct wa_rpipe *rpipe)
{
kref_init(&rpipe->refcnt);
spin_lock_init(&rpipe->seg_lock);
INIT_LIST_HEAD(&rpipe->seg_list);
}
static unsigned rpipe_get_idx(struct wahc *wa, unsigned rpipe_idx)
{
unsigned long flags;
spin_lock_irqsave(&wa->rpipe_bm_lock, flags);
rpipe_idx = find_next_zero_bit(wa->rpipe_bm, wa->rpipes, rpipe_idx);
if (rpipe_idx < wa->rpipes)
set_bit(rpipe_idx, wa->rpipe_bm);
spin_unlock_irqrestore(&wa->rpipe_bm_lock, flags);
return rpipe_idx;
}
static void rpipe_put_idx(struct wahc *wa, unsigned rpipe_idx)
{
unsigned long flags;
spin_lock_irqsave(&wa->rpipe_bm_lock, flags);
clear_bit(rpipe_idx, wa->rpipe_bm);
spin_unlock_irqrestore(&wa->rpipe_bm_lock, flags);
}
void rpipe_destroy(struct kref *_rpipe)
{
struct wa_rpipe *rpipe = container_of(_rpipe, struct wa_rpipe, refcnt);
u8 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
if (rpipe->ep)
rpipe->ep->hcpriv = NULL;
rpipe_put_idx(rpipe->wa, index);
wa_put(rpipe->wa);
kfree(rpipe);
}
EXPORT_SYMBOL_GPL(rpipe_destroy);
/*
* Locate an idle rpipe, create an structure for it and return it
*
* @wa is referenced and unlocked
* @crs enum rpipe_attr, required endpoint characteristics
*
* The rpipe can be used only sequentially (not in parallel).
*
* The rpipe is moved into the "ready" state.
*/
static int rpipe_get_idle(struct wa_rpipe **prpipe, struct wahc *wa, u8 crs,
gfp_t gfp)
{
int result;
unsigned rpipe_idx;
struct wa_rpipe *rpipe;
struct device *dev = &wa->usb_iface->dev;
rpipe = kzalloc(sizeof(*rpipe), gfp);
if (rpipe == NULL)
return -ENOMEM;
rpipe_init(rpipe);
/* Look for an idle pipe */
for (rpipe_idx = 0; rpipe_idx < wa->rpipes; rpipe_idx++) {
rpipe_idx = rpipe_get_idx(wa, rpipe_idx);
if (rpipe_idx >= wa->rpipes) /* no more pipes :( */
break;
result = __rpipe_get_descr(wa, &rpipe->descr, rpipe_idx);
if (result < 0)
dev_err(dev, "Can't get descriptor for rpipe %u: %d\n",
rpipe_idx, result);
else if ((rpipe->descr.bmCharacteristics & crs) != 0)
goto found;
rpipe_put_idx(wa, rpipe_idx);
}
*prpipe = NULL;
kfree(rpipe);
return -ENXIO;
found:
set_bit(rpipe_idx, wa->rpipe_bm);
rpipe->wa = wa_get(wa);
*prpipe = rpipe;
return 0;
}
static int __rpipe_reset(struct wahc *wa, unsigned index)
{
int result;
struct device *dev = &wa->usb_iface->dev;
result = usb_control_msg(
wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
USB_REQ_RPIPE_RESET,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
0, index, NULL, 0, 1000 /* FIXME: arbitrary */);
if (result < 0)
dev_err(dev, "rpipe %u: reset failed: %d\n",
index, result);
return result;
}
/*
* Fake companion descriptor for ep0
*
* See WUSB1.0[7.4.4], most of this is zero for bulk/int/ctl
*/
static struct usb_wireless_ep_comp_descriptor epc0 = {
.bLength = sizeof(epc0),
.bDescriptorType = USB_DT_WIRELESS_ENDPOINT_COMP,
/* .bMaxBurst = 1, */
.bMaxSequence = 31,
};
/*
* Look for EP companion descriptor
*
* Get there, look for Inara in the endpoint's extra descriptors
*/
static struct usb_wireless_ep_comp_descriptor *rpipe_epc_find(
struct device *dev, struct usb_host_endpoint *ep)
{
void *itr;
size_t itr_size;
struct usb_descriptor_header *hdr;
struct usb_wireless_ep_comp_descriptor *epcd;
if (ep->desc.bEndpointAddress == 0) {
epcd = &epc0;
goto out;
}
itr = ep->extra;
itr_size = ep->extralen;
epcd = NULL;
while (itr_size > 0) {
if (itr_size < sizeof(*hdr)) {
dev_err(dev, "HW Bug? ep 0x%02x: extra descriptors "
"at offset %zu: only %zu bytes left\n",
ep->desc.bEndpointAddress,
itr - (void *) ep->extra, itr_size);
break;
}
hdr = itr;
if (hdr->bDescriptorType == USB_DT_WIRELESS_ENDPOINT_COMP) {
epcd = itr;
break;
}
if (hdr->bLength > itr_size) {
dev_err(dev, "HW Bug? ep 0x%02x: extra descriptor "
"at offset %zu (type 0x%02x) "
"length %d but only %zu bytes left\n",
ep->desc.bEndpointAddress,
itr - (void *) ep->extra, hdr->bDescriptorType,
hdr->bLength, itr_size);
break;
}
itr += hdr->bLength;
itr_size -= hdr->bDescriptorType;
}
out:
return epcd;
}
/*
* Aim an rpipe to its device & endpoint destination
*
* Make sure we change the address to unauthenticathed if the device
* is WUSB and it is not authenticated.
*/
static int rpipe_aim(struct wa_rpipe *rpipe, struct wahc *wa,
struct usb_host_endpoint *ep, struct urb *urb, gfp_t gfp)
{
int result = -ENOMSG; /* better code for lack of companion? */
struct device *dev = &wa->usb_iface->dev;
struct usb_device *usb_dev = urb->dev;
struct usb_wireless_ep_comp_descriptor *epcd;
u8 unauth;
epcd = rpipe_epc_find(dev, ep);
if (epcd == NULL) {
dev_err(dev, "ep 0x%02x: can't find companion descriptor\n",
ep->desc.bEndpointAddress);
goto error;
}
unauth = usb_dev->wusb && !usb_dev->authenticated ? 0x80 : 0;
__rpipe_reset(wa, le16_to_cpu(rpipe->descr.wRPipeIndex));
atomic_set(&rpipe->segs_available, le16_to_cpu(rpipe->descr.wRequests));
/* FIXME: block allocation system; request with queuing and timeout */
/* FIXME: compute so seg_size > ep->maxpktsize */
rpipe->descr.wBlocks = cpu_to_le16(16); /* given */
/* ep0 maxpktsize is 0x200 (WUSB1.0[4.8.1]) */
rpipe->descr.wMaxPacketSize = cpu_to_le16(ep->desc.wMaxPacketSize);
rpipe->descr.bHSHubAddress = 0; /* reserved: zero */
rpipe->descr.bHSHubPort = wusb_port_no_to_idx(urb->dev->portnum);
/* FIXME: use maximum speed as supported or recommended by device */
rpipe->descr.bSpeed = usb_pipeendpoint(urb->pipe) == 0 ?
UWB_PHY_RATE_53 : UWB_PHY_RATE_200;
dev_dbg(dev, "addr %u (0x%02x) rpipe #%u ep# %u speed %d\n",
urb->dev->devnum, urb->dev->devnum | unauth,
le16_to_cpu(rpipe->descr.wRPipeIndex),
usb_pipeendpoint(urb->pipe), rpipe->descr.bSpeed);
/* see security.c:wusb_update_address() */
if (unlikely(urb->dev->devnum == 0x80))
rpipe->descr.bDeviceAddress = 0;
else
rpipe->descr.bDeviceAddress = urb->dev->devnum | unauth;
rpipe->descr.bEndpointAddress = ep->desc.bEndpointAddress;
/* FIXME: bDataSequence */
rpipe->descr.bDataSequence = 0;
/* FIXME: dwCurrentWindow */
rpipe->descr.dwCurrentWindow = cpu_to_le32(1);
/* FIXME: bMaxDataSequence */
rpipe->descr.bMaxDataSequence = epcd->bMaxSequence - 1;
rpipe->descr.bInterval = ep->desc.bInterval;
/* FIXME: bOverTheAirInterval */
rpipe->descr.bOverTheAirInterval = 0; /* 0 if not isoc */
/* FIXME: xmit power & preamble blah blah */
rpipe->descr.bmAttribute = ep->desc.bmAttributes & 0x03;
/* rpipe->descr.bmCharacteristics RO */
/* FIXME: bmRetryOptions */
rpipe->descr.bmRetryOptions = 15;
/* FIXME: use for assessing link quality? */
rpipe->descr.wNumTransactionErrors = 0;
result = __rpipe_set_descr(wa, &rpipe->descr,
le16_to_cpu(rpipe->descr.wRPipeIndex));
if (result < 0) {
dev_err(dev, "Cannot aim rpipe: %d\n", result);
goto error;
}
result = 0;
error:
return result;
}
/*
* Check an aimed rpipe to make sure it points to where we want
*
* We use bit 19 of the Linux USB pipe bitmap for unauth vs auth
* space; when it is like that, we or 0x80 to make an unauth address.
*/
static int rpipe_check_aim(const struct wa_rpipe *rpipe, const struct wahc *wa,
const struct usb_host_endpoint *ep,
const struct urb *urb, gfp_t gfp)
{
int result = 0; /* better code for lack of companion? */
struct device *dev = &wa->usb_iface->dev;
struct usb_device *usb_dev = urb->dev;
u8 unauth = (usb_dev->wusb && !usb_dev->authenticated) ? 0x80 : 0;
u8 portnum = wusb_port_no_to_idx(urb->dev->portnum);
#define AIM_CHECK(rdf, val, text) \
do { \
if (rpipe->descr.rdf != (val)) { \
dev_err(dev, \
"rpipe aim discrepancy: " #rdf " " text "\n", \
rpipe->descr.rdf, (val)); \
result = -EINVAL; \
WARN_ON(1); \
} \
} while (0)
AIM_CHECK(wMaxPacketSize, cpu_to_le16(ep->desc.wMaxPacketSize),
"(%u vs %u)");
AIM_CHECK(bHSHubPort, portnum, "(%u vs %u)");
AIM_CHECK(bSpeed, usb_pipeendpoint(urb->pipe) == 0 ?
UWB_PHY_RATE_53 : UWB_PHY_RATE_200,
"(%u vs %u)");
AIM_CHECK(bDeviceAddress, urb->dev->devnum | unauth, "(%u vs %u)");
AIM_CHECK(bEndpointAddress, ep->desc.bEndpointAddress, "(%u vs %u)");
AIM_CHECK(bInterval, ep->desc.bInterval, "(%u vs %u)");
AIM_CHECK(bmAttribute, ep->desc.bmAttributes & 0x03, "(%u vs %u)");
#undef AIM_CHECK
return result;
}
#ifndef CONFIG_BUG
#define CONFIG_BUG 0
#endif
/*
* Make sure there is an rpipe allocated for an endpoint
*
* If already allocated, we just refcount it; if not, we get an
* idle one, aim it to the right location and take it.
*
* Attaches to ep->hcpriv and rpipe->ep to ep.
*/
int rpipe_get_by_ep(struct wahc *wa, struct usb_host_endpoint *ep,
struct urb *urb, gfp_t gfp)
{
int result = 0;
struct device *dev = &wa->usb_iface->dev;
struct wa_rpipe *rpipe;
u8 eptype;
mutex_lock(&wa->rpipe_mutex);
rpipe = ep->hcpriv;
if (rpipe != NULL) {
if (CONFIG_BUG == 1) {
result = rpipe_check_aim(rpipe, wa, ep, urb, gfp);
if (result < 0)
goto error;
}
__rpipe_get(rpipe);
dev_dbg(dev, "ep 0x%02x: reusing rpipe %u\n",
ep->desc.bEndpointAddress,
le16_to_cpu(rpipe->descr.wRPipeIndex));
} else {
/* hmm, assign idle rpipe, aim it */
result = -ENOBUFS;
eptype = ep->desc.bmAttributes & 0x03;
result = rpipe_get_idle(&rpipe, wa, 1 << eptype, gfp);
if (result < 0)
goto error;
result = rpipe_aim(rpipe, wa, ep, urb, gfp);
if (result < 0) {
rpipe_put(rpipe);
goto error;
}
ep->hcpriv = rpipe;
rpipe->ep = ep;
__rpipe_get(rpipe); /* for caching into ep->hcpriv */
dev_dbg(dev, "ep 0x%02x: using rpipe %u\n",
ep->desc.bEndpointAddress,
le16_to_cpu(rpipe->descr.wRPipeIndex));
}
error:
mutex_unlock(&wa->rpipe_mutex);
return result;
}
/*
* Allocate the bitmap for each rpipe.
*/
int wa_rpipes_create(struct wahc *wa)
{
wa->rpipes = wa->wa_descr->wNumRPipes;
wa->rpipe_bm = kzalloc(BITS_TO_LONGS(wa->rpipes)*sizeof(unsigned long),
GFP_KERNEL);
if (wa->rpipe_bm == NULL)
return -ENOMEM;
return 0;
}
void wa_rpipes_destroy(struct wahc *wa)
{
struct device *dev = &wa->usb_iface->dev;
if (!bitmap_empty(wa->rpipe_bm, wa->rpipes)) {
char buf[256];
WARN_ON(1);
bitmap_scnprintf(buf, sizeof(buf), wa->rpipe_bm, wa->rpipes);
dev_err(dev, "BUG: pipes not released on exit: %s\n", buf);
}
kfree(wa->rpipe_bm);
}
/*
* Release resources allocated for an endpoint
*
* If there is an associated rpipe to this endpoint, Abort any pending
* transfers and put it. If the rpipe ends up being destroyed,
* __rpipe_destroy() will cleanup ep->hcpriv.
*
* This is called before calling hcd->stop(), so you don't need to do
* anything else in there.
*/
void rpipe_ep_disable(struct wahc *wa, struct usb_host_endpoint *ep)
{
struct wa_rpipe *rpipe;
mutex_lock(&wa->rpipe_mutex);
rpipe = ep->hcpriv;
if (rpipe != NULL) {
u16 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
usb_control_msg(
wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
USB_REQ_RPIPE_ABORT,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
0, index, NULL, 0, 1000 /* FIXME: arbitrary */);
rpipe_put(rpipe);
}
mutex_unlock(&wa->rpipe_mutex);
}
EXPORT_SYMBOL_GPL(rpipe_ep_disable);