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path: root/drivers/usb/host/uhci-q.c
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* usb : replace dma_pool_alloc and memset with dma_pool_zallocSaurabh Sengar2015-12-011-2/+1
| | | | | | | | replace dma_pool_alloc and memset with a single call to dma_pool_zalloc Signed-off-by: Saurabh Sengar <saurabh.truth@gmail.com> Acked-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* USB: UHCI: accept very late isochronous URBsAlan Stern2013-09-251-4/+8
| | | | | | | | | | | | | | | | | Commit 24f531371de1 (USB: EHCI: accept very late isochronous URBs) changed the isochronous API provided by ehci-hcd. URBs submitted too late, so that the time slots for all their packets have already expired, are no longer rejected outright. Instead the submission is accepted, and the URB completes normally with a -EXDEV error for each packet. This is what client drivers expect. This patch implements the same policy in uhci-hcd. It should be applied to all kernels containing commit c44b225077bb (UHCI: implement new semantics for URB_ISO_ASAP). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* USB: fix latency in uhci-hcd and ohci-hcdAlan Stern2013-05-151-1/+1
| | | | | | | | | | | | | | | | | | | | | Commits c44b225077bb1fb25ed5cd5c4f226897b91bedd4 (UHCI: implement new semantics for URB_ISO_ASAP) and 6a41b4d3fe8cd4cc95181516fc6fba7b1747a27c (OHCI: implement new semantics for URB_ISO_ASAP) increased the latency for isochronous URBs in uhci-hcd and ohci-hcd respectively to 2 milliseconds, in an attempt to avoid underruns. It turns out that not only was this unnecessary -- 1-ms latency works okay -- it also causes problems with certain application loads such as real-time audio. This patch changes the latency for both drivers back to 1 ms. This should be applied to -stable kernels going back to 3.8. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-and-tested-by: Joe Rayhawk <jrayhawk@fairlystable.org> CC: Clemens Ladisch <clemens@ladisch.de> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* USB: uhci: check buffer length to avoid memory overflowChen Gang2013-01-241-1/+1
| | | | | | | | | | | | | | | | | | for function uhci_sprint_schedule: the buffer len is MAX_OUTPUT: 64 * 1024, which may not be enough: may loop UHCI_NUMFRAMES times (UHCI_NUMFRAMES is 1024) each time of loop may get more than 64 bytes so need check the buffer length to avoid memory overflow this patch fix it like this: at first, make enough room for buffering the exceeding contents judge the contents which written whether bigger than buffer length if bigger (the exceeding contents will be in the exceeding buffer) break current work flow, and return. Signed-off-by: Chen Gang <gang.chen@asianux.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* UHCI: implement new semantics for URB_ISO_ASAPAlan Stern2012-10-221-37/+36
| | | | | | | | | | This patch (as1613) updates the isochronous scheduling in uhci-hcd to match the new semantics for URB_ISO_ASAP. The amount of code alteration is smaller than it looks because of a change in the indentation level. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* usb: fix number of mapped SG DMA entriesClemens Ladisch2011-12-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a new field num_mapped_sgs to struct urb so that we have a place to store the number of mapped entries and can also retain the original value of entries in num_sgs. Previously, usb_hcd_map_urb_for_dma() would overwrite this with the number of mapped entries, which would break dma_unmap_sg() because it requires the original number of entries. This fixes warnings like the following when using USB storage devices: ------------[ cut here ]------------ WARNING: at lib/dma-debug.c:902 check_unmap+0x4e4/0x695() ehci_hcd 0000:00:12.2: DMA-API: device driver frees DMA sg list with different entry count [map count=4] [unmap count=1] Modules linked in: ohci_hcd ehci_hcd Pid: 0, comm: kworker/0:1 Not tainted 3.2.0-rc2+ #319 Call Trace: <IRQ> [<ffffffff81036d3b>] warn_slowpath_common+0x80/0x98 [<ffffffff81036de7>] warn_slowpath_fmt+0x41/0x43 [<ffffffff811fa5ae>] check_unmap+0x4e4/0x695 [<ffffffff8105e92c>] ? trace_hardirqs_off+0xd/0xf [<ffffffff8147208b>] ? _raw_spin_unlock_irqrestore+0x33/0x50 [<ffffffff811fa84a>] debug_dma_unmap_sg+0xeb/0x117 [<ffffffff8137b02f>] usb_hcd_unmap_urb_for_dma+0x71/0x188 [<ffffffff8137b166>] unmap_urb_for_dma+0x20/0x22 [<ffffffff8137b1c5>] usb_hcd_giveback_urb+0x5d/0xc0 [<ffffffffa0000d02>] ehci_urb_done+0xf7/0x10c [ehci_hcd] [<ffffffffa0001140>] qh_completions+0x429/0x4bd [ehci_hcd] [<ffffffffa000340a>] ehci_work+0x95/0x9c0 [ehci_hcd] ... ---[ end trace f29ac88a5a48c580 ]--- Mapped at: [<ffffffff811faac4>] debug_dma_map_sg+0x45/0x139 [<ffffffff8137bc0b>] usb_hcd_map_urb_for_dma+0x22e/0x478 [<ffffffff8137c494>] usb_hcd_submit_urb+0x63f/0x6fa [<ffffffff8137d01c>] usb_submit_urb+0x2c7/0x2de [<ffffffff8137dcd4>] usb_sg_wait+0x55/0x161 Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: use usb_endpoint_maxp() instead of le16_to_cpu()Kuninori Morimoto2011-08-231-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now ${LINUX}/drivers/usb/* can use usb_endpoint_maxp(desc) to get maximum packet size instead of le16_to_cpu(desc->wMaxPacketSize). This patch fix it up Cc: Armin Fuerst <fuerst@in.tum.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Johannes Erdfelt <johannes@erdfelt.com> Cc: Vojtech Pavlik <vojtech@suse.cz> Cc: Oliver Neukum <oliver@neukum.name> Cc: David Kubicek <dave@awk.cz> Cc: Johan Hovold <jhovold@gmail.com> Cc: Brad Hards <bhards@bigpond.net.au> Acked-by: Felipe Balbi <balbi@ti.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de> Cc: David Brownell <david-b@pacbell.net> Cc: David Lopo <dlopo@chipidea.mips.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Xie Xiaobo <X.Xie@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Jiang Bo <tanya.jiang@freescale.com> Cc: Yuan-hsin Chen <yhchen@faraday-tech.com> Cc: Darius Augulis <augulis.darius@gmail.com> Cc: Xiaochen Shen <xiaochen.shen@intel.com> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Cc: OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Cc: Ben Dooks <ben@simtec.co.uk> Cc: Thomas Abraham <thomas.ab@samsung.com> Cc: Herbert Pötzl <herbert@13thfloor.at> Cc: Arnaud Patard <arnaud.patard@rtp-net.org> Cc: Roman Weissgaerber <weissg@vienna.at> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Tony Olech <tony.olech@elandigitalsystems.com> Cc: Florian Floe Echtler <echtler@fs.tum.de> Cc: Christian Lucht <lucht@codemercs.com> Cc: Juergen Stuber <starblue@sourceforge.net> Cc: Georges Toth <g.toth@e-biz.lu> Cc: Bill Ryder <bryder@sgi.com> Cc: Kuba Ober <kuba@mareimbrium.org> Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: UHCI: Add support for big endian descriptorsJan Andersson2011-05-191-64/+67
| | | | | | | | | | | | | | | This patch adds support for universal host controllers that use big endian descriptors. Support for BE descriptors requires a non-PCI host controller. For kernels with PCI-only UHCI there should be no change in behaviour. This patch tries to replicate the technique used to support BE descriptors in the EHCI HCD. Parts added to uhci-hcd.h are basically copy'n'paste from ehci.h. Signed-off-by: Jan Andersson <jan@gaisler.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: host: uhci-q: Fixed minor coding style issuesTobias Ollmann2010-12-101-5/+7
| | | | | | | | Fixed coding style issues (delete trailing whitespaces, break long line) Signed-off-by: Tobias Ollmann <tobias.ollmann@gmx.at> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: UHCI: add native scatter-gather support(v1)Ming Lei2010-10-221-4/+29
| | | | | | | | | | This patch adds native scatter-gather support to uhci-hcd. Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Ming Lei <tom.leiming@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: UHCI: acquire spinlock before calling start_rh()Alan Stern2010-08-101-2/+2
| | | | | | | | | | | | | | | | | | This patch (as1392) fixes a bug in uhci-hcd: The start_rh() routine is supposed to be called with the private spinlock held. If an IRQ comes in at just the wrong time, the driver will think the controller has died when in fact it simply hasn't start yet. The patch also addresses some issues that may prevent an URB from being unlinked after the controller has stopped. This is an abnormal occurrence (ordinarily the controller stops only when the entire bus is suspended and hence there are no active URBs), so the pathways haven't gotten much testing. These two changes may be a little more than is strictly necessary, but clearly they won't hurt. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: uhci: rm repeatedly evaluation for urbp->qhBob Liu2009-09-231-1/+0
| | | | | | | Signed-off-by: Bob Liu <yjfpb04@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: UHCI queue: use usb_endpoint_type()Matthias Kaehlcke2009-06-151-1/+1
| | | | | | | | | use usb_endpoint_type() instead of fiddling manually with bmAttributes Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: uhci: don't use pseudo negative valuesAlan Stern2009-03-241-7/+4
| | | | | | | | | | | | The code in uhci-q.c doesn't have to use pseudo-negative values. I did it that way because it was easy and because it would give the expected output during debugging. But it doesn't have to work that way. Here's another approach. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: replace uses of __constant_{endian}Harvey Harrison2009-03-241-5/+5
| | | | | | | | The base versions handle constant folding now. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: UHCI: improve scheduling of interrupt URBsAlan Stern2008-10-171-6/+11
| | | | | | | | | | | | | | | | | This patch (as1140) adds a little intelligence to the interrupt-URB scheduler in uhci-hcd. Right now the scheduler is stupid; every URB having the same period is assigned to the same slot. Thus a large group of period-N URBs can fill their slot and cause -ENOSPC errors even when all the lower-period slots are empty. With the patch, if an URB doesn't fit in its assigned slot then the scheduler will try using lower-period slots. This will provide greater flexibility. As an example, the driver will be able to handle more than just three or four mice, which the current driver cannot. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* usb: turn dev_warn+WARN_ON combos into dev_WARNArjan van de Ven2008-10-161-16/+8
| | | | | | | | | | dev_WARN is both compacter and gives better debug information than just a WARN_ON, since people and tools will copy the device information message together with the WARN_ON in bug reports. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: replace remaining __FUNCTION__ occurrencesHarvey Harrison2008-04-241-1/+1
| | | | | | | | __FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: fix scheduling of Iso URBs in uhci-hcdAlan Stern2007-10-251-5/+14
| | | | | | | | | | | | | | This patch (as1003) changes uhci-hcd to treat the URB_ISO_ASAP flag the same as other host controller drivers, namely, to schedule an Iso URB for the first available time slot that hasn't already expired. URBs in which the flag isn't set will be scheduled for the first slot following the last URB, even if it has expired. This fixes a problem reported by Martin Bachem. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: Eliminate urb->status usage!Alan Stern2007-10-121-8/+4
| | | | | | | | | | | | | | | This patch (as979) removes the last vestiges of urb->status from the host controller drivers and the root-hub emulator. Now the field doesn't get set until just before the URB's completion routine is called. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: David Brownell <david-b@pacbell.net> CC: Olav Kongas <ok@artecdesign.ee> CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> CC: Tony Olech <tony.olech@elandigitalsystems.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: add urb->unlinked fieldAlan Stern2007-10-121-6/+3
| | | | | | | | | | | | | | | | This patch (as970) adds a new urb->unlinked field, which is used to store the status of unlinked URBs since we can't use urb->status for that purpose any more. To help simplify the HCDs, usbcore will check urb->unlinked before calling the completion handler; if the value is set it will automatically override the status reported by the HCD. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: David Brownell <david-b@pacbell.net> CC: Olav Kongas <ok@artecdesign.ee> CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> CC: Tony Olech <tony.olech@elandigitalsystems.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: centralize -EREMOTEIO handlingAlan Stern2007-10-121-8/+0
| | | | | | | | | | | | | | | | | | | This patch (as969) continues the ongoing changes to the way HCDs report URB statuses. The programming interface has been simplified by making usbcore responsible for clearing urb->hcpriv and for setting -EREMOTEIO status when an URB with the URB_SHORT_NOT_OK flag ends up as a short transfer. By moving the work out of the HCDs, this removes a fair amount of repeated code. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: David Brownell <david-b@pacbell.net> CC: Olav Kongas <ok@artecdesign.ee> CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> CC: Tony Olech <tony.olech@elandigitalsystems.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: remove Iso status value in uhci-hcdAlan Stern2007-10-121-8/+3
| | | | | | | | | | | | | This patch (968) changes the way uhci-hcd reports status for Isochronous URBs. Until now urb->status has been set to the last detected error code. But other HCDs don't do this; they leave the status set to 0 and report errors only in the individual iso packet descriptors. So this patch removes the extra computation and makes uhci-hcd behave like the others. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: make HCDs responsible for managing endpoint queuesAlan Stern2007-10-121-15/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch (as954) implements a suggestion of David Brownell's. Now the host controller drivers are responsible for linking and unlinking URBs to/from their endpoint queues. This eliminates the possiblity of strange situations where usbcore thinks an URB is linked but the HCD thinks it isn't. It also means HCDs no longer have to check for URBs being dequeued before they were fully enqueued. In addition to the core changes, this requires changing every host controller driver and the root-hub URB handler. For the most part the required changes are fairly small; drivers have to call usb_hcd_link_urb_to_ep() in their urb_enqueue method, usb_hcd_check_unlink_urb() in their urb_dequeue method, and usb_hcd_unlink_urb_from_ep() before giving URBs back. A few HCDs make matters more complicated by the way they split up the flow of control. In addition some method interfaces get changed. The endpoint argument for urb_enqueue is now redundant so it is removed. The unlink status is required by usb_hcd_check_unlink_urb(), so it has been added to urb_dequeue. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: David Brownell <david-b@pacbell.net> CC: Olav Kongas <ok@artecdesign.ee> CC: Tony Olech <tony.olech@elandigitalsystems.com> CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: short control URBs get a status stageAlan Stern2007-07-191-21/+38
| | | | | | | | | | | It has recently been pointed out that short control transfers should have a status stage, even if they generate an error because URB_SHORT_NOT_OK was set. This patch (as935) changes uhci-hcd to enable the status stage when this happens. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: Add some WARN_ON()sAlan Stern2007-04-271-4/+12
| | | | | | | | | | | | This patch (as872) adds some WARN_ON()s to various error checks which are never supposed to fail. Unsettlingly, one of them has shown up in a user's log! Maybe making the warning more visible and having the call-stack information available will help pinpoint the source of the problem. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: Fix problem caused by lack of terminating QHAlan Stern2007-03-261-70/+24
| | | | | | | | | | | | | | This patch (as871) fixes a problem introduced by an earlier change. It turns out that some systems really do need to have a terminating skeleton QH present whenever FSBR is on. I don't know any way to tell which systems do need it and which don't; the easiest answer is to have it there always. This fixes the NumLock-hang bug reported by Jiri Slaby. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: Eliminate asynchronous skeleton Queue HeadersAlan Stern2007-02-231-22/+171
| | | | | | | | | | | | | | | | | | This patch (as856) attempts to improve the performance of uhci-hcd by removing the asynchronous skeleton Queue Headers. They don't contain any useful information but the controller has to read through them at least once every millisecond, incurring a non-zero DMA overhead. Now all the asynchronous queues are combined, along with the period-1 interrupt queue, into a single list with a single skeleton QH. The start of the low-speed control, full-speed control, and bulk sublists is determined by linear search. Since there should rarely be more than a couple of QHs in the list, the searches should incur a much smaller total load than keeping the skeleton QHs. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: Add macros for computing DMA valuesAlan Stern2007-02-231-16/+14
| | | | | | | | | This patch (as855) adds some convenience macros to uhci-hcd, to help simplify the code for computing hardware DMA pointers. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] Transform kmem_cache_alloc()+memset(0) -> kmem_cache_zalloc().Robert P. J. Day2007-02-111-3/+1
| | | | | | | | | | | | | | | | | | | | | | Replace appropriate pairs of "kmem_cache_alloc()" + "memset(0)" with the corresponding "kmem_cache_zalloc()" call. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: Roland McGrath <roland@redhat.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Greg KH <greg@kroah.com> Acked-by: Joel Becker <Joel.Becker@oracle.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Jan Kara <jack@ucw.cz> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* UHCI: fix bandwidth allocationAlan Stern2007-02-071-66/+175
| | | | | | | | | This patch (as840) fixes the bandwidth allocation mechanism in uhci-hcd. It has never worked correctly. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: no dummy TDs for Iso QHsAlan Stern2007-02-071-7/+10
| | | | | | | | | | | | | Isochronous queues don't need a dummy TD because the Queue Header isn't managed by the hardware. This patch (as836) removes the unnecessary dummy TDs. The patch also fixes a long-standing typo in a comment (a "don't" was missing -- potentially very confusing!). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] slab: remove SLAB_ATOMICChristoph Lameter2006-12-071-1/+1
| | | | | | | | SLAB_ATOMIC is an alias of GFP_ATOMIC Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells2006-10-051-8/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
* uhci-hcd: fix list access bugAlan Stern2006-08-311-1/+1
| | | | | | | | | | When skipping to the last TD of an URB, go to the _last_ entry in the list instead of the _first_ entry (as780). This fixes Bugzilla #6747 and possibly others. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UHCI: don't stop at an Iso errorAlan Stern2006-08-311-1/+1
| | | | | | | | | | | Unlike other sorts of endpoint queues, Isochronous queues don't stop when an error is encountered. This patch (as772) fixes the scanning routine in uhci-hcd, to make it keep on going when it finds an Iso error. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* USB: UHCI: Don't test the Short Packet Detect bitAlan Stern2006-08-021-1/+3
| | | | | | | | | | | | | | | | Apparently some UHCI controllers change the value of the Short Packet Detect (SPD) bit in the TD status word -- presumably when they receive a short packet. This patch (as759) changes uhci-hcd to avoid assuming that the bit is unchanged; in fact, the driver no longer looks at SPD at all. This fixes the second problem reported in Bugzilla #6752. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Improve FSBR-off timingAlan Stern2006-06-211-20/+51
| | | | | | | | | | | | This patch (as707) improves the FSBR operation in uhci-hcd by turning it off more quickly when it isn't needed. FSBR puts a noticeable load on a computer's PCI bus, so it should be disabled as soon as possible when it isn't in use. The patch leaves it running for only 10 ms after the last URB stops using it, on the theory that this should be long enough for a driver to submit another URB if it wants keep FSBR going. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: various updatesDavid Brownell2006-06-211-1/+1
| | | | | | | | | | | | | | | | | | | | This patch (as705) contains a small set of updates for uhci-hcd written mostly by Dave Brownell: * Root hub suspend messages come out labeled as root hub messages; PCI messages should only come out when the pci device suspends. * Rename the reset() method to better match its init() role * Behave more like the other HCDs by returning -ESHUTDOWN for root-hub suspend/resume errors. * When an URB fails, associate the message with the usb device not the host controller (it still hides endpoint and direction) From: David Brownell <david-b@pacbell.net> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: remove ISO TDs as they are usedAlan Stern2006-06-211-30/+73
| | | | | | | | | | | | This patch (as690) does the same thing for ISO TDs as as680 did for non-ISO TDs: free them as they are used rather than all at once when an URB is complete. At the same time it fixes a minor buglet (I'm not aware of it ever affecting anyone): An ISO TD should be retired when its frame is over, regardless of whether or not the hardware has marked it inactive. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: store the period in the queue headerAlan Stern2006-06-211-17/+55
| | | | | | | | | | | This patch (as689) stores the period for periodic transfers (interrupt and ISO) in the queue header. This is necessary for proper bandwidth tracking (not yet implemented). It also makes the scheduling of ISO transfers a bit more rigorous, with checks for out-of-bounds frame numbers. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: fix race in ISO dequeuingAlan Stern2006-06-211-12/+36
| | | | | | | | | | | | This patch (as688) fixes a small race in uhci-hcd. Because ISO queues aren't controlled by queue headers, they can't be unlinked. Only individual URBs can. So whenever multiple ISO URBs are dequeued, it's necessary to make sure the hardware is done with each one. We can't assume that dequeuing the first URB will suffice to unlink the entire queue. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Work around old Intel bugAlan Stern2006-06-211-1/+15
| | | | | | | | | | Some old Intel UHCI controllers have a bug that has shown up in a few systems (the PIIX3 "Neptune" chip set). Until now there has not been any simple way to work around the bug, but the lastest changes in uhci-hcd have made it easy. This patch (as684) adds the work-around. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Reimplement FSBRAlan Stern2006-06-211-40/+128
| | | | | | | | | | | | This patch (as683) re-implements Full-Speed Bandwidth Reclamation (FSBR) properly. It keeps track of which endpoint queues have advanced, and when none have advanced for a sufficiently long time, FSBR is turned off. The next TD on each of the non-moving queues is modified to generate an interrupt on completion, so that FSBR can be re-enabled as soon as the hardware starts to make some progress. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Eliminate the TD-removal listAlan Stern2006-06-211-65/+27
| | | | | | | | | | This patch (as682) gets rid of the TD-removal list in uhci-hcd. It is no longer needed because now TDs are not freed until we know the hardware isn't using them. It also simplifies the code for adding and removing TDs to/from URBs. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Move code for cleaning up unlinked URBsAlan Stern2006-06-211-24/+33
| | | | | | | | This patch (as681) moves some code for cleaning up after unlinked URBs out of the general completion pathway into the unlinking pathway. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Remove non-iso TDs as they are usedAlan Stern2006-06-211-36/+42
| | | | | | | | | | | This patch (as680) frees non-isochronous TDs as they are used, rather than all at once when an URB is complete. Although not a terribly important change in itself, it opens the door to a later enhancement that will reduce storage requirements by allocating only a limited number of TDs at any time for each endpoint queue. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] UHCI: Common result routine for Control/Bulk/InterruptAlan Stern2006-06-211-217/+125
| | | | | | | | | | | This patch (as679) combines the result routine for Control URBs with the routine for Bulk/Interrupt URBs. Along the way I eliminated the debugging printouts for Control transfers unless the debugging level is set higher than 1. I also eliminated a long-unused (#ifdef'ed-out) section that works around some buggy old APC BackUPS devices. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] USB: UHCI: fix obscure bug in enqueue()Alan Stern2006-06-211-9/+15
| | | | | | | | | | | This patch (as676) fixes a small bug in uhci-hcd's enqueue routine. When an URB is unlinked or gets an error and the completion handler queues another URB for the same endpoint, the queue shouldn't be allowed to start up again until the handler returns. Not even if the new URB is the only one on its queue. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] USB: UHCI: store the endpoint type in the QH structureAlan Stern2006-06-211-16/+18
| | | | | | | | This patch (as675) simplifies uhci-hcd slightly by storing each endpoint's type in the corresponding Queue Header structure. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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