linux_dsm_epyc7002/drivers/net/wimax/i2400m/usb-notif.c

259 lines
7.8 KiB
C
Raw Normal View History

/*
* Intel Wireless WiMAX Connection 2400m over USB
* Notification handling
*
*
* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* Intel Corporation <linux-wimax@intel.com>
* Yanir Lubetkin <yanirx.lubetkin@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* - Initial implementation
*
*
* The notification endpoint is active when the device is not in boot
* mode; in here we just read and get notifications; based on those,
* we act to either reinitialize the device after a reboot or to
* submit a RX request.
*
* ROADMAP
*
* i2400mu_usb_notification_setup()
*
* i2400mu_usb_notification_release()
*
* i2400mu_usb_notification_cb() Called when a URB is ready
* i2400mu_notif_grok()
* i2400m_is_boot_barker()
* i2400m_dev_reset_handle()
* i2400mu_rx_kick()
*/
#include <linux/usb.h>
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>
2010-03-24 15:04:11 +07:00
#include <linux/slab.h>
#include "i2400m-usb.h"
#define D_SUBMODULE notif
#include "usb-debug-levels.h"
static const
__le32 i2400m_ZERO_BARKER[4] = { 0, 0, 0, 0 };
/*
* Process a received notification
*
* In normal operation mode, we can only receive two types of payloads
* on the notification endpoint:
*
* - a reboot barker, we do a bootstrap (the device has reseted).
*
* - a block of zeroes: there is pending data in the IN endpoint
*/
static
int i2400mu_notification_grok(struct i2400mu *i2400mu, const void *buf,
size_t buf_len)
{
int ret;
struct device *dev = &i2400mu->usb_iface->dev;
struct i2400m *i2400m = &i2400mu->i2400m;
d_fnstart(4, dev, "(i2400m %p buf %p buf_len %zu)\n",
i2400mu, buf, buf_len);
ret = -EIO;
if (buf_len < sizeof(i2400m_ZERO_BARKER))
/* Not a bug, just ignore */
goto error_bad_size;
ret = 0;
if (!memcmp(i2400m_ZERO_BARKER, buf, sizeof(i2400m_ZERO_BARKER))) {
i2400mu_rx_kick(i2400mu);
goto out;
}
ret = i2400m_is_boot_barker(i2400m, buf, buf_len);
if (unlikely(ret >= 0))
ret = i2400m_dev_reset_handle(i2400m, "device rebooted");
else /* Unknown or unexpected data in the notif message */
i2400m_unknown_barker(i2400m, buf, buf_len);
error_bad_size:
out:
d_fnend(4, dev, "(i2400m %p buf %p buf_len %zu) = %d\n",
i2400mu, buf, buf_len, ret);
return ret;
}
/*
* URB callback for the notification endpoint
*
* @urb: the urb received from the notification endpoint
*
* This function will just process the USB side of the transaction,
* checking everything is fine, pass the processing to
* i2400m_notification_grok() and resubmit the URB.
*/
static
void i2400mu_notification_cb(struct urb *urb)
{
int ret;
struct i2400mu *i2400mu = urb->context;
struct device *dev = &i2400mu->usb_iface->dev;
d_fnstart(4, dev, "(urb %p status %d actual_length %d)\n",
urb, urb->status, urb->actual_length);
ret = urb->status;
switch (ret) {
case 0:
ret = i2400mu_notification_grok(i2400mu, urb->transfer_buffer,
urb->actual_length);
if (ret == -EIO && edc_inc(&i2400mu->urb_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME))
goto error_exceeded;
if (ret == -ENOMEM) /* uff...power cycle? shutdown? */
goto error_exceeded;
break;
case -EINVAL: /* while removing driver */
case -ENODEV: /* dev disconnect ... */
case -ENOENT: /* ditto */
case -ESHUTDOWN: /* URB killed */
case -ECONNRESET: /* disconnection */
goto out; /* Notify around */
default: /* Some error? */
if (edc_inc(&i2400mu->urb_edc,
EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME))
goto error_exceeded;
dev_err(dev, "notification: URB error %d, retrying\n",
urb->status);
}
usb_mark_last_busy(i2400mu->usb_dev);
ret = usb_submit_urb(i2400mu->notif_urb, GFP_ATOMIC);
switch (ret) {
case 0:
case -EINVAL: /* while removing driver */
case -ENODEV: /* dev disconnect ... */
case -ENOENT: /* ditto */
case -ESHUTDOWN: /* URB killed */
case -ECONNRESET: /* disconnection */
break; /* just ignore */
default: /* Some error? */
dev_err(dev, "notification: cannot submit URB: %d\n", ret);
goto error_submit;
}
d_fnend(4, dev, "(urb %p status %d actual_length %d) = void\n",
urb, urb->status, urb->actual_length);
return;
error_exceeded:
dev_err(dev, "maximum errors in notification URB exceeded; "
"resetting device\n");
error_submit:
usb_queue_reset_device(i2400mu->usb_iface);
out:
d_fnend(4, dev, "(urb %p status %d actual_length %d) = void\n",
urb, urb->status, urb->actual_length);
}
/*
* setup the notification endpoint
*
* @i2400m: device descriptor
*
* This procedure prepares the notification urb and handler for receiving
* unsolicited barkers from the device.
*/
int i2400mu_notification_setup(struct i2400mu *i2400mu)
{
struct device *dev = &i2400mu->usb_iface->dev;
int usb_pipe, ret = 0;
struct usb_endpoint_descriptor *epd;
char *buf;
d_fnstart(4, dev, "(i2400m %p)\n", i2400mu);
buf = kmalloc(I2400MU_MAX_NOTIFICATION_LEN, GFP_KERNEL | GFP_DMA);
if (buf == NULL) {
ret = -ENOMEM;
goto error_buf_alloc;
}
i2400mu->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!i2400mu->notif_urb) {
ret = -ENOMEM;
goto error_alloc_urb;
}
epd = usb_get_epd(i2400mu->usb_iface,
i2400mu->endpoint_cfg.notification);
usb_pipe = usb_rcvintpipe(i2400mu->usb_dev, epd->bEndpointAddress);
usb_fill_int_urb(i2400mu->notif_urb, i2400mu->usb_dev, usb_pipe,
buf, I2400MU_MAX_NOTIFICATION_LEN,
i2400mu_notification_cb, i2400mu, epd->bInterval);
ret = usb_submit_urb(i2400mu->notif_urb, GFP_KERNEL);
if (ret != 0) {
dev_err(dev, "notification: cannot submit URB: %d\n", ret);
goto error_submit;
}
d_fnend(4, dev, "(i2400m %p) = %d\n", i2400mu, ret);
return ret;
error_submit:
usb_free_urb(i2400mu->notif_urb);
error_alloc_urb:
kfree(buf);
error_buf_alloc:
d_fnend(4, dev, "(i2400m %p) = %d\n", i2400mu, ret);
return ret;
}
/*
* Tear down of the notification mechanism
*
* @i2400m: device descriptor
*
* Kill the interrupt endpoint urb, free any allocated resources.
*
* We need to check if we have done it before as for example,
* _suspend() call this; if after a suspend() we get a _disconnect()
* (as the case is when hibernating), nothing bad happens.
*/
void i2400mu_notification_release(struct i2400mu *i2400mu)
{
struct device *dev = &i2400mu->usb_iface->dev;
d_fnstart(4, dev, "(i2400mu %p)\n", i2400mu);
if (i2400mu->notif_urb != NULL) {
usb_kill_urb(i2400mu->notif_urb);
kfree(i2400mu->notif_urb->transfer_buffer);
usb_free_urb(i2400mu->notif_urb);
i2400mu->notif_urb = NULL;
}
d_fnend(4, dev, "(i2400mu %p)\n", i2400mu);
}