1. 15 9月, 2009 1 次提交
  2. 21 7月, 2008 1 次提交
  3. 30 4月, 2008 1 次提交
  4. 15 2月, 2007 1 次提交
  5. 12 2月, 2007 1 次提交
  6. 09 12月, 2006 1 次提交
    • A
      [PATCH] tty: switch to ktermios · 606d099c
      Alan Cox 提交于
      This is the grungy swap all the occurrences in the right places patch that
      goes with the updates.  At this point we have the same functionality as
      before (except that sgttyb() returns speeds not zero) and are ready to
      begin turning new stuff on providing nobody reports lots of bugs
      
      If you are a tty driver author converting an out of tree driver the only
      impact should be termios->ktermios name changes for the speed/property
      setting functions from your upper layers.
      
      If you are implementing your own TCGETS function before then your driver
      was broken already and its about to get a whole lot more painful for you so
      please fix it 8)
      
      Also fill in c_ispeed/ospeed on init for most devices, although the current
      code will do this for you anyway but I'd like eventually to lose that extra
      paranoia
      
      [akpm@osdl.org: bluetooth fix]
      [mp3@de.ibm.com: sclp fix]
      [mp3@de.ibm.com: warning fix for tty3270]
      [hugh@veritas.com: fix tty_ioctl powerpc build]
      [jdike@addtoit.com: uml: fix ->set_termios declaration]
      Signed-off-by: NAlan Cox <alan@redhat.com>
      Signed-off-by: NMartin Peschke <mp3@de.ibm.com>
      Acked-by: NPeter Oberparleiter <oberpar@de.ibm.com>
      Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
      Signed-off-by: NHugh Dickins <hugh@veritas.com>
      Signed-off-by: NJeff Dike <jdike@addtoit.com>
      Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      606d099c
  7. 31 10月, 2006 1 次提交
  8. 17 10月, 2006 1 次提交
  9. 05 10月, 2006 1 次提交
    • D
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      David Howells 提交于
      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: NDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  10. 01 10月, 2006 1 次提交
  11. 03 7月, 2006 1 次提交
  12. 23 6月, 2006 1 次提交
  13. 26 3月, 2006 1 次提交
  14. 12 3月, 2006 1 次提交
  15. 11 2月, 2006 1 次提交
  16. 11 1月, 2006 1 次提交
    • A
      [PATCH] TTY layer buffering revamp · 33f0f88f
      Alan Cox 提交于
      The API and code have been through various bits of initial review by
      serial driver people but they definitely need to live somewhere for a
      while so the unconverted drivers can get knocked into shape, existing
      drivers that have been updated can be better tuned and bugs whacked out.
      
      This replaces the tty flip buffers with kmalloc objects in rings. In the
      normal situation for an IRQ driven serial port at typical speeds the
      behaviour is pretty much the same, two buffers end up allocated and the
      kernel cycles between them as before.
      
      When there are delays or at high speed we now behave far better as the
      buffer pool can grow a bit rather than lose characters. This also means
      that we can operate at higher speeds reliably.
      
      For drivers that receive characters in blocks (DMA based, USB and
      especially virtualisation) the layer allows a lot of driver specific
      code that works around the tty layer with private secondary queues to be
      removed. The IBM folks need this sort of layer, the smart serial port
      people do, the virtualisers do (because a virtualised tty typically
      operates at infinite speed rather than emulating 9600 baud).
      
      Finally many drivers had invalid and unsafe attempts to avoid buffer
      overflows by directly invoking tty methods extracted out of the innards
      of work queue structs. These are no longer needed and all go away. That
      fixes various random hangs with serial ports on overflow.
      
      The other change in here is to optimise the receive_room path that is
      used by some callers. It turns out that only one ldisc uses receive room
      except asa constant and it updates it far far less than the value is
      read. We thus make it a variable not a function call.
      
      I expect the code to contain bugs due to the size alone but I'll be
      watching and squashing them and feeding out new patches as it goes.
      
      Because the buffers now dynamically expand you should only run out of
      buffering when the kernel runs out of memory for real.  That means a lot of
      the horrible hacks high performance drivers used to do just aren't needed any
      more.
      
      Description:
      
      tty_insert_flip_char is an old API and continues to work as before, as does
      tty_flip_buffer_push() [this is why many drivers dont need modification].  It
      does now also return the number of chars inserted
      
      There are also
      
      tty_buffer_request_room(tty, len)
      
      which asks for a buffer block of the length requested and returns the space
      found.  This improves efficiency with hardware that knows how much to
      transfer.
      
      and tty_insert_flip_string_flags(tty, str, flags, len)
      
      to insert a string of characters and flags
      
      For a smart interface the usual code is
      
          len = tty_request_buffer_room(tty, amount_hardware_says);
          tty_insert_flip_string(tty, buffer_from_card, len);
      
      More description!
      
      At the moment tty buffers are attached directly to the tty.  This is causing a
      lot of the problems related to tty layer locking, also problems at high speed
      and also with bursty data (such as occurs in virtualised environments)
      
      I'm working on ripping out the flip buffers and replacing them with a pool of
      dynamically allocated buffers.  This allows both for old style "byte I/O"
      devices and also helps virtualisation and smart devices where large blocks of
      data suddenely materialise and need storing.
      
      So far so good.  Lots of drivers reference tty->flip.*.  Several of them also
      call directly and unsafely into function pointers it provides.  This will all
      break.  Most drivers can use tty_insert_flip_char which can be kept as an API
      but others need more.
      
      At the moment I've added the following interfaces, if people think more will
      be needed now is a good time to say
      
       int tty_buffer_request_room(tty, size)
      
      Try and ensure at least size bytes are available, returns actual room (may be
      zero).  At the moment it just uses the flipbuf space but that will change.
      Repeated calls without characters being added are not cumulative.  (ie if you
      call it with 1, 1, 1, and then 4 you'll have four characters of space.  The
      other functions will also try and grow buffers in future but this will be a
      more efficient way when you know block sizes.
      
       int tty_insert_flip_char(tty, ch, flag)
      
      As before insert a character if there is room.  Now returns 1 for success, 0
      for failure.
      
       int tty_insert_flip_string(tty, str, len)
      
      Insert a block of non error characters.  Returns the number inserted.
      
       int tty_prepare_flip_string(tty, strptr, len)
      
      Adjust the buffer to allow len characters to be added.  Returns a buffer
      pointer in strptr and the length available.  This allows for hardware that
      needs to use functions like insl or mencpy_fromio.
      Signed-off-by: NAlan Cox <alan@redhat.com>
      Cc: Paul Fulghum <paulkf@microgate.com>
      Signed-off-by: NHirokazu Takata <takata@linux-m32r.org>
      Signed-off-by: NSerge Hallyn <serue@us.ibm.com>
      Signed-off-by: NJeff Dike <jdike@addtoit.com>
      Signed-off-by: NJohn Hawkes <hawkes@sgi.com>
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      Signed-off-by: NAdrian Bunk <bunk@stusta.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      33f0f88f
  17. 31 10月, 2005 1 次提交
  18. 01 10月, 2005 1 次提交
    • B
      [PATCH] ioc4_serial: Remove bogus error message · d38e24e2
      Brent Casavant 提交于
      This change removes a bogus error message from the IOC4 serial driver
      interrupt handler.
      
      This error message is bogus for two reasons.  First, it can never occur
      given that current code takes care to initialize IOC4 in such a way that
      these "unknown" interrupts could never occur.  Second, this code fails to
      take into account that other drivers can share the IOC4 interrupt mechanism
      through SA_SHIRQ, and thus this driver is not in-fact "all-knowing".
      
      Finally, this error message triggers every time some "unknown" interrupt
      occurs -- it's not rate limited or repetition limited in any way, thereby
      effectively denying use of the console device.  Given its bogosity in the
      first place, it's best to just get rid of it entirely.
      Acked-by: NPat Gefre <pfg@sgi.com>
      Signed-off-by: NBrent Casavant <bcasavan@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      d38e24e2
  19. 22 6月, 2005 2 次提交
    • B
      [PATCH] ioc4: PCI bus speed detection · d4c477ca
      Brent Casavant 提交于
      Several hardware features of SGI's IOC4 I/O controller chip require
      timing-related driver calculations dependent upon the PCI bus speed.  This
      patch enables the core IOC4 driver code to detect the actual bus speed and
      store a value that can later be used by the IOC4 subdrivers as needed.
      Signed-off-by: NBrent Casavant <bcasavan@sgi.com>
      Acked-by: NPat Gefre <pfg@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      d4c477ca
    • B
      [PATCH] ioc4: Core driver rewrite · 22329b51
      Brent Casavant 提交于
      This series of patches reworks the configuration and internal structure
      of the SGI IOC4 I/O controller device drivers.
      
      These changes are motivated by several factors:
      
      - The IOC4 chip PCI resources are of mixed use between functions (i.e.
        multiple functions are handled in the same address range, sometimes
        within the same register), muddling resource ownership and initialization
        issues.  Centralizing this ownership in a core driver is desirable.
      
      - The IOC4 chip implements multiple functions (serial, IDE, others not
        yet implemented in the mainline kernel) but is not a multifunction
        PCI device.  In order to properly handle device addition and removal
        as well as module insertion and deletion, an intermediary IOC4-specific
        driver layer is needed to handle these operations cleanly.
      
      - All IOC4 drivers are currently enabled by a single CONFIG value.  As
        not all systems need all IOC4 functions, it is desireable to enable
        these drivers independently.
      
      - The current IOC4 core driver will trigger loading of all function-level
        drivers, as it makes direct calls to them.  This situation should be
        reversed (i.e. function-level drivers cause loading of core driver)
        in order to maintain a clear and least-surprise driver loading model.
      
      - IOC4 hardware design necessitates some driver-level dependency on
        the PCI bus clock speed.  Current code assumes a 66MHz bus, but the
        speed should be autodetected and appropriate compensation taken.
      
      This patch series effects the above changes by a newly and better designed
      IOC4 core driver with which the function-level drivers can register and
      deregister themselves upon module insertion/removal.  By tracking these
      modules, device addition/removal is also handled properly.  PCI resource
      management and ownership issues are centralized in this core driver, and
      IOC4-wide configuration actions such as bus speed detection are also
      handled in this core driver.
      
      This patch:
      
      The SGI IOC4 I/O controller chip implements multiple functions, though it is
      not a multi-function PCI device.  Additionally, various PCI resources of the
      IOC4 are shared by multiple hardware functions, and thus resource ownership by
      driver is not clearly delineated.  Due to the current driver design, all core
      and subordinate drivers must be loaded, or none, which is undesirable if not
      all IOC4 hardware features are being used.
      
      This patch reorganizes the IOC4 drivers so that the core driver provides a
      subdriver registration service.  Through appropriate callbacks the subdrivers
      can now handle device addition and removal, as well as module insertion and
      deletion (though the IOC4 IDE driver requires further work before module
      deletion will work).  The core driver now takes care of allocating PCI
      resources and data which must be shared between subdrivers, to clearly
      delineate module ownership of these items.
      Signed-off-by: NBrent Casavant <bcasavan@sgi.com>
      Acked-by: Pat Gefre <pfg@sgi.com
      Acked-by: NJeremy Higdon <jeremy@sgi.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      22329b51
  20. 01 5月, 2005 4 次提交
  21. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4