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![Tejun Heo](/assets/img/avatar_default.png)
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>
451 lines
13 KiB
C
451 lines
13 KiB
C
/*
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* Wireless USB Host Controller
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* Root Hub operations
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*
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* We fake a root hub that has fake ports (as many as simultaneous
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* devices the Wireless USB Host Controller can deal with). For each
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* port we keep an state in @wusbhc->port[index] identical to the one
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* specified in the USB2.0[ch11] spec and some extra device
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* information that complements the one in 'struct usb_device' (as
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* this lacs a hcpriv pointer).
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*
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* Note this is common to WHCI and HWA host controllers.
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*
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* Through here we enable most of the state changes that the USB stack
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* will use to connect or disconnect devices. We need to do some
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* forced adaptation of Wireless USB device states vs. wired:
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*
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* USB: WUSB:
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*
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* Port Powered-off port slot n/a
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* Powered-on port slot available
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* Disconnected port slot available
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* Connected port slot assigned device
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* device sent DN_Connect
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* device was authenticated
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* Enabled device is authenticated, transitioned
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* from unauth -> auth -> default address
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* -> enabled
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* Reset disconnect
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* Disable disconnect
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*
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* This maps the standard USB port states with the WUSB device states
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* so we can fake ports without having to modify the USB stack.
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*
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* FIXME: this process will change in the future
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*
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*
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* ENTRY POINTS
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*
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* Our entry points into here are, as in hcd.c, the USB stack root hub
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* ops defined in the usb_hcd struct:
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*
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* wusbhc_rh_status_data() Provide hub and port status data bitmap
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*
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* wusbhc_rh_control() Execution of all the major requests
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* you can do to a hub (Set|Clear
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* features, get descriptors, status, etc).
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*
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* wusbhc_rh_[suspend|resume]() That
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*
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* wusbhc_rh_start_port_reset() ??? unimplemented
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*/
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#include <linux/slab.h>
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#include "wusbhc.h"
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/*
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* Reset a fake port
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*
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* Using a Reset Device IE is too heavyweight as it causes the device
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* to enter the UnConnected state and leave the cluster, this can mean
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* that when the device reconnects it is connected to a different fake
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* port.
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*
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* Instead, reset authenticated devices with a SetAddress(0), followed
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* by a SetAddresss(AuthAddr).
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*
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* For unauthenticated devices just pretend to reset but do nothing.
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* If the device initialization continues to fail it will eventually
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* time out after TrustTimeout and enter the UnConnected state.
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* Supposedly we are the only thread accesing @wusbhc->port; in any
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* case, maybe we should move the mutex locking from
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* wusbhc_devconnect_auth() to here.
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*
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* @port_idx refers to the wusbhc's port index, not the USB port number
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*/
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static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
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{
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int result = 0;
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struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
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struct wusb_dev *wusb_dev = port->wusb_dev;
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if (wusb_dev == NULL)
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return -ENOTCONN;
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port->status |= USB_PORT_STAT_RESET;
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port->change |= USB_PORT_STAT_C_RESET;
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if (wusb_dev->addr & WUSB_DEV_ADDR_UNAUTH)
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result = 0;
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else
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result = wusb_dev_update_address(wusbhc, wusb_dev);
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port->status &= ~USB_PORT_STAT_RESET;
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port->status |= USB_PORT_STAT_ENABLE;
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port->change |= USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_ENABLE;
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return result;
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}
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/*
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* Return the hub change status bitmap
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*
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* The bits in the change status bitmap are cleared when a
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* ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4].
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* WARNING!! This gets called from atomic context; we cannot get the
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* mutex--the only race condition we can find is some bit
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* changing just after we copy it, which shouldn't be too
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* big of a problem [and we can't make it an spinlock
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* because other parts need to take it and sleep] .
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*
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* @usb_hcd is refcounted, so it won't dissapear under us
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* and before killing a host, the polling of the root hub
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* would be stopped anyway.
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*/
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int wusbhc_rh_status_data(struct usb_hcd *usb_hcd, char *_buf)
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{
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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size_t cnt, size;
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unsigned long *buf = (unsigned long *) _buf;
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/* WE DON'T LOCK, see comment */
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size = wusbhc->ports_max + 1 /* hub bit */;
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size = (size + 8 - 1) / 8; /* round to bytes */
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for (cnt = 0; cnt < wusbhc->ports_max; cnt++)
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if (wusb_port_by_idx(wusbhc, cnt)->change)
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set_bit(cnt + 1, buf);
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else
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clear_bit(cnt + 1, buf);
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return size;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);
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/*
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* Return the hub's desciptor
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*
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* NOTE: almost cut and paste from ehci-hub.c
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked
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*/
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static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue,
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u16 wIndex,
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struct usb_hub_descriptor *descr,
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u16 wLength)
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{
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u16 temp = 1 + (wusbhc->ports_max / 8);
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u8 length = 7 + 2 * temp;
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if (wLength < length)
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return -ENOSPC;
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descr->bDescLength = 7 + 2 * temp;
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descr->bDescriptorType = 0x29; /* HUB type */
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descr->bNbrPorts = wusbhc->ports_max;
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descr->wHubCharacteristics = cpu_to_le16(
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0x00 /* All ports power at once */
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| 0x00 /* not part of compound device */
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| 0x10 /* No overcurrent protection */
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| 0x00 /* 8 FS think time FIXME ?? */
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| 0x00); /* No port indicators */
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descr->bPwrOn2PwrGood = 0;
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descr->bHubContrCurrent = 0;
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/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
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memset(&descr->bitmap[0], 0, temp);
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memset(&descr->bitmap[temp], 0xff, temp);
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return 0;
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}
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/*
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* Clear a hub feature
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* Nothing to do, so no locking needed ;)
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*/
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static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature)
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{
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int result;
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switch (feature) {
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case C_HUB_LOCAL_POWER:
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/* FIXME: maybe plug bit 0 to the power input status,
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* if any?
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* see wusbhc_rh_get_hub_status() */
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case C_HUB_OVER_CURRENT:
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result = 0;
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break;
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default:
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result = -EPIPE;
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}
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return result;
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}
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/*
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* Return hub status (it is always zero...)
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* Nothing to do, so no locking needed ;)
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*/
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static int wusbhc_rh_get_hub_status(struct wusbhc *wusbhc, u32 *buf,
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u16 wLength)
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{
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/* FIXME: maybe plug bit 0 to the power input status (if any)? */
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*buf = 0;
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return 0;
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}
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/*
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* Set a port feature
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature,
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u8 selector, u8 port_idx)
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{
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struct device *dev = wusbhc->dev;
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if (port_idx > wusbhc->ports_max)
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return -EINVAL;
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switch (feature) {
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/* According to USB2.0[11.24.2.13]p2, these features
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* are not required to be implemented. */
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case USB_PORT_FEAT_C_OVER_CURRENT:
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case USB_PORT_FEAT_C_ENABLE:
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case USB_PORT_FEAT_C_SUSPEND:
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case USB_PORT_FEAT_C_CONNECTION:
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case USB_PORT_FEAT_C_RESET:
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return 0;
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case USB_PORT_FEAT_POWER:
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/* No such thing, but we fake it works */
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mutex_lock(&wusbhc->mutex);
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wusb_port_by_idx(wusbhc, port_idx)->status |= USB_PORT_STAT_POWER;
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mutex_unlock(&wusbhc->mutex);
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return 0;
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case USB_PORT_FEAT_RESET:
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return wusbhc_rh_port_reset(wusbhc, port_idx);
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case USB_PORT_FEAT_ENABLE:
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case USB_PORT_FEAT_SUSPEND:
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dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n",
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port_idx, feature, selector);
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return -ENOSYS;
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default:
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dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n",
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port_idx, feature, selector);
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return -EPIPE;
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}
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return 0;
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}
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/*
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* Clear a port feature...
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature,
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u8 selector, u8 port_idx)
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{
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int result = 0;
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struct device *dev = wusbhc->dev;
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if (port_idx > wusbhc->ports_max)
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return -EINVAL;
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mutex_lock(&wusbhc->mutex);
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switch (feature) {
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case USB_PORT_FEAT_POWER: /* fake port always on */
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/* According to USB2.0[11.24.2.7.1.4], no need to implement? */
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case USB_PORT_FEAT_C_OVER_CURRENT:
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break;
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case USB_PORT_FEAT_C_RESET:
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wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET;
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break;
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case USB_PORT_FEAT_C_CONNECTION:
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wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION;
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break;
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case USB_PORT_FEAT_ENABLE:
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__wusbhc_dev_disable(wusbhc, port_idx);
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break;
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case USB_PORT_FEAT_C_ENABLE:
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wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE;
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break;
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case USB_PORT_FEAT_SUSPEND:
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case USB_PORT_FEAT_C_SUSPEND:
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dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n",
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port_idx, feature, selector);
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result = -ENOSYS;
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break;
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default:
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dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n",
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port_idx, feature, selector);
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result = -EPIPE;
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break;
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}
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mutex_unlock(&wusbhc->mutex);
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return result;
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}
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/*
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* Return the port's status
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx,
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u32 *_buf, u16 wLength)
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{
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__le16 *buf = (__le16 *)_buf;
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if (port_idx > wusbhc->ports_max)
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return -EINVAL;
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mutex_lock(&wusbhc->mutex);
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buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status);
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buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change);
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mutex_unlock(&wusbhc->mutex);
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return 0;
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}
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/*
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* Entry point for Root Hub operations
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue,
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u16 wIndex, char *buf, u16 wLength)
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{
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int result = -ENOSYS;
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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switch (reqntype) {
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case GetHubDescriptor:
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result = wusbhc_rh_get_hub_descr(
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wusbhc, wValue, wIndex,
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(struct usb_hub_descriptor *) buf, wLength);
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break;
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case ClearHubFeature:
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result = wusbhc_rh_clear_hub_feat(wusbhc, wValue);
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break;
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case GetHubStatus:
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result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength);
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break;
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case SetPortFeature:
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result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8,
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(wIndex & 0xff) - 1);
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break;
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case ClearPortFeature:
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result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8,
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(wIndex & 0xff) - 1);
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break;
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case GetPortStatus:
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result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1,
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(u32 *)buf, wLength);
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break;
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case SetHubFeature:
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default:
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dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) "
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"UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype,
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wValue, wIndex, buf, wLength);
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/* dump_stack(); */
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result = -ENOSYS;
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}
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return result;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_control);
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int wusbhc_rh_suspend(struct usb_hcd *usb_hcd)
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{
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
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usb_hcd, wusbhc);
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/* dump_stack(); */
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_suspend);
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int wusbhc_rh_resume(struct usb_hcd *usb_hcd)
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{
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
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usb_hcd, wusbhc);
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/* dump_stack(); */
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_resume);
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int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx)
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{
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n",
|
|
__func__, usb_hcd, wusbhc, port_idx);
|
|
WARN_ON(1);
|
|
return -ENOSYS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset);
|
|
|
|
static void wusb_port_init(struct wusb_port *port)
|
|
{
|
|
port->status |= USB_PORT_STAT_HIGH_SPEED;
|
|
}
|
|
|
|
/*
|
|
* Alloc fake port specific fields and status.
|
|
*/
|
|
int wusbhc_rh_create(struct wusbhc *wusbhc)
|
|
{
|
|
int result = -ENOMEM;
|
|
size_t port_size, itr;
|
|
port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]);
|
|
wusbhc->port = kzalloc(port_size, GFP_KERNEL);
|
|
if (wusbhc->port == NULL)
|
|
goto error_port_alloc;
|
|
for (itr = 0; itr < wusbhc->ports_max; itr++)
|
|
wusb_port_init(&wusbhc->port[itr]);
|
|
result = 0;
|
|
error_port_alloc:
|
|
return result;
|
|
}
|
|
|
|
void wusbhc_rh_destroy(struct wusbhc *wusbhc)
|
|
{
|
|
kfree(wusbhc->port);
|
|
}
|