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  1. 02 12月, 2006 4 次提交
  3. 15 11月, 2006 1 次提交
  5. 01 11月, 2006 1 次提交
  7. 05 10月, 2006 2 次提交
    • D
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      由 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
    • A
      [PATCH] libata: Don't believe bogus claims in the older PIO mode register · 46767aeb
      由 Alan Cox 提交于 
      Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      46767aeb
  9. 29 9月, 2006 1 次提交
  11. 28 9月, 2006 3 次提交
  13. 27 9月, 2006 1 次提交
  15. 19 9月, 2006 2 次提交
    • A
      [PATCH] libata: improve handling of diagostic fail (and hardware that misreports it) · 93590859
      由 Alan Cox 提交于 
      Our ATA probe code checks that a device is not reporting a diagnostic
failure during start up. Unfortunately at least one device seems to like
doing this - the Gigabyte iRAM.

This is only done for the master right now (which is fine for the iRAM
as it is SATA), as with PATA some combinations of ATAPI device seem to
fool the check into seeing a drive that isn't there if it is applied to
the slave.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      93590859
    • T
      [PATCH] libata: fix non-uniform ports handling · fea63e38
      由 Tejun Heo 提交于 
      Non-uniform ports handling got broken while updating libata to handle
those in the same host.  Only separate irq for the non-uniform
secondary port was implemented while all other fields (host flags,
transfer mode...) of the secondary port simply shared those of the
first.

For ata_piix combined mode, which ATM is the only user of non-uniform
ports, this causes the secondary port assume the wrong type.  This can
cause PATA port to use SATA ops, which results in bogus check on PCS
and detection failure.

This patch adds ata_probe_ent->pinfo2 which points to optional
port_info for the secondary port.  For the time being, this seems to
be the simplest solution.  This workaround will be removed together
with ata_probe_ent itself after init model is updated to allow more
flexibility.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Nelson A. de Oliveira <naoliv@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      fea63e38
  17. 24 8月, 2006 1 次提交
    • J
      libata: Grand renaming. · cca3974e
      由 Jeff Garzik 提交于 
      The biggest change is that ata_host_set is renamed to ata_host.

* ata_host_set			=> ata_host
* ata_probe_ent->host_flags	=> ata_probe_ent->port_flags
* ata_probe_ent->host_set_flags	=> ata_probe_ent->_host_flags
* ata_host_stats		=> ata_port_stats
* ata_port->host		=> ata_port->scsi_host
* ata_port->host_set		=> ata_port->host
* ata_port_info->host_flags	=> ata_port_info->flags
* ata_(.*)host_set(.*)\(\)	=> ata_\1host\2()

The leading underscore in ata_probe_ent->_host_flags is to avoid
reusing ->host_flags for different purpose.  Currently, the only user
of the field is libata-bmdma.c and probe_ent itself is scheduled to be
removed.

ata_port->host is reused for different purpose but this field is used
inside libata core proper and of different type.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      cca3974e
  19. 15 8月, 2006 1 次提交
  21. 10 8月, 2006 9 次提交
    • J
      Move libata to drivers/ata. · c6fd2807
      由 Jeff Garzik 提交于
      c6fd2807
    • T
      [PATCH] libata: kill unused hard_port_no and legacy_mode · 4852ba24
      由 Tejun Heo 提交于 
      Kill unused probe_ent/ap->hard_port_no and probe_ent->legacy_mode.
Signed-off-by: NTejun Heo <htejun@gmail.com>
      4852ba24
    • T
      [PATCH] libata: use dummy port for stolen legacy ports · c4b01f1d
      由 Tejun Heo 提交于 
      Use dummy port for stolen legacy ports.  This makes ap->port_no always
equal ap->hard_port_no.
Signed-off-by: NTejun Heo <htejun@gmail.com>
      c4b01f1d
    • T
      [PATCH] libata: implement dummy port · dd5b06c4
      由 Tejun Heo 提交于 
      Implement dummy port which can be requested by setting appropriate bit
in probe_ent->dummy_port_mask.  The dummy port is used as placeholder
for stolen legacy port.  This allows libata to guarantee that
index_of(ap) == ap->port_no == actual_device_port_no, and thus to
remove error-prone ap->hard_port_no.

As it's used only when one port of a legacy controller is reserved by
some other entity (e.g. IDE), the focus is on keeping the added *code*
complexity at minimum, so dummy port allocates all libata core
resources and acts as a normal port.  It just has all dummy port_ops.

This patch only implements dummy port.  The following patch will make
libata use it for stolen legacy ports.
Signed-off-by: NTejun Heo <htejun@gmail.com>
      dd5b06c4
    • A
      [PATCH] libata: rework legacy handling to remove much of the cruft · 2ec7df04
      由 Alan Cox 提交于 
      Kill host_set->next
Fix simplex support
Allow per platform setting of IDE legacy bases

Some of this can be tidied further later on, in particular all the
legacy port gunge belongs as a PCI quirk/PCI header decode to understand
the special legacy IDE rules in the PCI spec.

Longer term Jeff also wants to move the request_irq/free_irq out of core
which will make this even cleaner.

tj: folded in three followup patches - ata_piix-fix, broken-arch-fix
and fix-new-legacy-handling, and separated per-dev xfermask into
separate patch preceding this one.  Folded in fixes are...

* ata_piix-fix: fix build failure due to host_set->next removal
* broken-arch-fix: add missing include/asm-*/libata-portmap.h
* fix-new-legacy-handling:
	* In ata_pci_init_legacy_port(), probe_num was incorrectly
          incremented during initialization of the secondary port and
          probe_ent->n_ports was incorrectly fixed to 1.

	* Both legacy ports ended up having the same hard_port_no.

	* When printing port information, both legacy ports printed
	  the first irq.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NTejun Heo <htejun@gmail.com>
      2ec7df04
    • T
      [PATCH] libata: implement per-dev xfermask · 37deecb5
      由 Tejun Heo 提交于 
      Implement per-dev xfermask.  libata used to determine xfermask
per-port - the fastest mode of the slowest device on the port.  This
patch enables per-dev xfermask.

Original patch is from Alan Cox <alan@redhat.com>.  The following
changes are made by me.

* simplex warning message is added
* remove disabled device handling code which is never invoked
  (originally for choosing port-wide lowest PIO mode)

Cc: Alan Cox <alan@redhat.com>
Signed-off-by: NTejun Heo <htejun@gmail.com>
      37deecb5
    • J
      [PATCH] [libata] Kill 'count' var in ata_device_add() · 6d0500df
      由 Jeff Garzik 提交于 
      Eliminate redundant loop variable 'count'
Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NTejun Heo <htejun@gmail.com>
      6d0500df
    • J
      [PATCH] [libata] some function renaming · 996139f1
      由 Jeff Garzik 提交于 
      s/ata_host_add/ata_port_add/
s/ata_host_init/ata_port_init/

libata naming got stuck in the middle of a Great Renaming:

	ata_host -> ata_port
	ata_host_set -> ata_host

To eliminate confusion, let's just give up for now, and simply ensure
that things are internally consistent.
Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NTejun Heo <htejun@gmail.com>
      996139f1
    • T
      [PATCH] libata: update ata_host_init() and rename it to ata_port_init_shost() · 4608c160
      由 Tejun Heo 提交于 
      Update ata_host_init() such that it only initializes SCSI host related
stuff and doesn't call into ata_port_init(), and rename it to
ata_port_init_shost().
Signed-off-by: NTejun Heo <htejun@gmail.com>
      4608c160
  23. 09 8月, 2006 4 次提交
  25. 05 8月, 2006 3 次提交
  27. 29 7月, 2006 1 次提交
  29. 06 7月, 2006 6 次提交
    • B
      [PATCH] libata-core.c: restore configuration boot messages in ata_dev_configure(), v2 · 5afc8142
      由 Borislav Petkov 提交于 
      This one looks better, IMHO.

This restores the default libata configuration messages printed during booting.

Signed-off-by: <petkov@math.uni-muenster.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      5afc8142
    • T
      [PATCH] libata: reimplement controller-wide PM · 500530f6
      由 Tejun Heo 提交于 
      Reimplement controller-wide PM.  ata_host_set_suspend/resume() are
defined to suspend and resume a host_set.  While suspended, EHs for
all ports in the host_set are pegged using ATA_FLAG_SUSPENDED and
frozen.

Because SCSI device hotplug is done asynchronously against the rest of
libata EH and the same mutex is used when adding new device, suspend
cannot wait for hotplug to complete.  So, if SCSI device hotplug is in
progress, suspend fails with -EBUSY.

In most cases, host_set resume is followed by device resume.  As each
resume operation requires a reset, a single host_set-wide resume
operation may result in multiple resets.  To avoid this, resume waits
upto 1 second giving PM to request resume for devices.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      500530f6
    • T
      [PATCH] libata: reimplement per-dev PM · d6f26d1f
      由 Tejun Heo 提交于 
      Reimplement per-dev PM.  The original implementation directly put the
device into suspended mode and didn't synchronize w/ EH operations
including hotplug.  This patch reimplements ata_scsi_device_suspend()
and ata_scsi_device_resume() such that they request EH to perform the
respective operations.  Both functions synchronize with hotplug such
that it doesn't operate on detached devices.

Suspend waits for completion but resume just issues request and
returns.  This allows parallel wake up of devices and thus speeds up
system resume.

Due to sdev detach synchronization, it's not feasible to separate out
EH requesting from sdev handling; thus, ata_device_suspend/resume()
are removed and everything is implemented in the respective
libata-scsi functions.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      d6f26d1f
    • T
      [PATCH] libata: implement PM EH actions · 02670bf3
      由 Tejun Heo 提交于 
      Implement two PM per-dev EH actions - ATA_EH_SUSPEND and
ATA_EH_RESUME.  Each action puts the target device into suspended mode
and resumes from it respectively.

Once a device is put to suspended mode, no EH operations other than
RESUME is allowed on the device.  The device will stay suspended till
it gets resumed and thus reset and revalidated.  To implement this, a
new device state helper - ata_dev_ready() - is implemented and used in
EH action implementations to make them operate only on attached &
running devices.

If all possible devices on a port are suspended, reset is skipped too.
This prevents spurious events including hotplug events from disrupting
suspended devices.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      02670bf3
    • T
      [PATCH] libata: implement ATA_EHI_NO_AUTOPSY and QUIET · 1cdaf534
      由 Tejun Heo 提交于 
      Implement ATA_EHI_NO_AUTOPSY and QUIET.  These used to be implied by
ATA_PFLAG_LOADING, but new power management and PMP support need to
use these separately.  e.g. Suspend/resume operations shouldn't print
full EH messages and resume shouldn't be recorded as an error.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      1cdaf534
    • T
      [PATCH] libata: clean up debounce parameters and improve parameter selection · e9c83914
      由 Tejun Heo 提交于 
      The names of predefined debounce timing parameters didn't exactly
match their usages.  Rename to more generic names and implement param
selection helper sata_ehc_deb_timing() which uses EHI_HOTPLUGGED to
select params.

Combined with the previous EHI_RESUME_LINK differentiation, this makes
parameter selection accurate.  e.g. user scan resumes link but normal
deb param is used instead of hotplug param.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      e9c83914