11 Aug, 2015
1 commit
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Quoting Arnd:
I was thinking the opposite approach and basically removing all uses
of IORESOURCE_CACHEABLE from the kernel. There are only a handful of
them.and we can probably replace them all with hardcoded
ioremap_cached() calls in the cases they are actually useful.All existing usages of IORESOURCE_CACHEABLE call ioremap() instead of
ioremap_nocache() if the resource is cacheable, however ioremap() is
uncached by default. Clearly none of the existing usages care about the
cacheability. Particularly devm_ioremap_resource() never worked as
advertised since it always fell back to plain ioremap().Clean this up as the new direction we want is to convert
ioremap_() usages to memremap(..., flags).Suggested-by: Arnd Bergmann
Reviewed-by: Christoph Hellwig
Signed-off-by: Dan Williams
22 May, 2013
1 commit
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To fix a 5-year-old regression, reverse changes made by commit
7ef3639 (PNP: don't fail device init if no DMA channel available).As an example to show the problem, my sound card provides a
prioritized list of PnP "dependent sets" of requested resources:dependent set 0 (preferred) wants DMA 5.
dependent set 1 (acceptable) will take DMA 5, 6, or 7.
...
dependent set 4 (acceptable) doesn't request a high DMA.If DMA 5 is not available, pnp_assign_dma has to fail on set 0 so that
pnp_auto_config_dev will move on to set 1 and get DMA 6 or 7.
Instead, pnp_assign_dma adds the resource with flags |=
IORESOURCE_DISABLED and returns success. pnp_auto_config_dev just
sees success and therefore chooses set 0 with a disabled DMA and never
tries the sets that would have resolved the conflict.Furthermore, this mode of "success" is unexpected and unhandled in
sound/isa/sb and probably other drivers. sb assumes that the returned
DMA is enabled and obliviously uses the invalid DMA number. Observed
consequences were sb successfully grabbing a DMA that was expressly
forbidden by the kernel parameter pnp_reserve_dma.The only upside to the original change would be as a kludge for
devices that can operate in degraded mode without a DMA but that don't
provide the corresponding non-preferred dependent set. The right
workaround for those devices is to synthesize the missing set in
quirks.c; otherwise, you're reinventing PnP fallback functionality at
the driver level for that device and all others.Signed-off-by: David Flater
Signed-off-by: Rafael J. Wysocki
03 Jan, 2013
1 commit
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The patch copies the flags masked by IORESOURCE_BITS from a resource's
template. This is necessary because the resource settings require proper
IORESOURCE_BITS which are not known during the definition of these resources
using the "/sys/bus/pnp/*/*/resources" interface. (In fact, they should not
be set by the user as the resource templates define the proper settings.)If the patch is not applied, the resource flags are not initialized properly
and obscure messages in the kernel log have been seen ("invalid flags").Signed-off-by: Witold Szczeponik
Reviewed-by: Bjorn Helgaas
Signed-off-by: Rafael J. Wysocki
23 Mar, 2011
1 commit
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IORESOURCE_DMA cannot be assigned without utilizing the interface
provided by CONFIG_ISA_DMA_API, specifically request_dma() and
free_dma(). Thus, there's a strict dependency on the config option and
limits IORESOURCE_DMA only to architectures that support ISA-style DMA.ia64 is not one of those architectures, so pnp_check_dma() no longer
needs to be special-cased for that architecture.pnp_assign_resources() will now return -EINVAL if IORESOURCE_DMA is
attempted on such a kernel.Signed-off-by: David Rientjes
Cc: Ingo Molnar
Cc: "H. Peter Anvin"
Cc: Thomas Gleixner
Cc: Bjorn Helgaas
Cc: Russell King
Cc: "Luck, Tony"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Mar, 2010
1 commit
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…it slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig8. 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>
11 Oct, 2008
1 commit
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pnp_dbg() is equivalent to dev_dbg() except that we can turn it
on at boot-time with the "pnp.debug" kernel parameter, so we don't
have to build a new kernel image.Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Signed-off-by: Len Brown
17 Jul, 2008
8 commits
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ISAPNP, PNPBIOS, and ACPI describe the "possible resource settings" of
a device, i.e., the possibilities an OS bus driver has when it assigns
I/O port, MMIO, and other resources to the device.PNP used to maintain this "possible resource setting" information in
one independent option structure and a list of dependent option
structures for each device. Each of these option structures had lists
of I/O, memory, IRQ, and DMA resources, for example:dev
independent options
ind-io0 -> ind-io1 ...
ind-mem0 -> ind-mem1 ...
...
dependent option set 0
dep0-io0 -> dep0-io1 ...
dep0-mem0 -> dep0-mem1 ...
...
dependent option set 1
dep1-io0 -> dep1-io1 ...
dep1-mem0 -> dep1-mem1 ...
...
...This data structure was designed for ISAPNP, where the OS configures
device resource settings by writing directly to configuration
registers. The OS can write the registers in arbitrary order much
like it writes PCI BARs.However, for PNPBIOS and ACPI devices, the OS uses firmware interfaces
that perform device configuration, and it is important to pass the
desired settings to those interfaces in the correct order. The OS
learns the correct order by using firmware interfaces that return the
"current resource settings" and "possible resource settings," but the
option structures above doesn't store the ordering information.This patch replaces the independent and dependent lists with a single
list of options. For example, a device might have possible resource
settings like this:dev
options
ind-io0 -> dep0-io0 -> dep1->io0 -> ind-io1 ...All the possible settings are in the same list, in the order they
come from the firmware "possible resource settings" list. Each entry
is tagged with an independent/dependent flag. Dependent entries also
have a "set number" and an optional priority value. All dependent
entries must be assigned from the same set. For example, the OS can
use all the entries from dependent set 0, or all the entries from
dependent set 1, but it cannot mix entries from set 0 with entries
from set 1.Prior to this patch PNP didn't keep track of the order of this list,
and it assigned all independent options first, then all dependent
ones. Using the example above, that resulted in a "desired
configuration" list like this:ind->io0 -> ind->io1 -> depN-io0 ...
instead of the list the firmware expects, which looks like this:
ind->io0 -> depN-io0 -> ind-io1 ...
Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Acked-by: Rene Herman
Signed-off-by: Len Brown -
This patch adds an IORESOURCE_IRQ_OPTIONAL flag for use when
assigning resources to a device. If the flag is set and we are
unable to assign an IRQ to the device, we can leave the IRQ
disabled but allow the overall resource allocation to succeed.Some devices request an IRQ, but can run without an IRQ
(possibly with degraded performance). This flag lets us run
the device without the IRQ instead of just leaving the
device disabled.This is a reimplementation of this previous change by Rene
Herman :
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3b73a223661ed137c5d3d2635f954382e94f5a43I reimplemented this for two reasons:
- to prepare for converting all resource options into a single linked
list, as opposed to the per-resource-type lists we have now, and
- to preserve the order and number of resource options.In PNPBIOS and ACPI, we configure a device by giving firmware a
list of resource assignments. It is important that this list
has exactly the same number of resources, in the same order,
as the "template" list we got from the firmware in the first
place.The problem of a sound card MPU401 being left disabled for want of
an IRQ was reported by Uwe Bugla .Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Acked-by: Rene Herman
Signed-off-by: Len Brown -
pnp_assign_resources() is static and the only caller checks
pnp_can_configure() before calling it, so no need to do it
again.Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Acked-by: Rene Herman
Signed-off-by: Len Brown -
This patch doesn't change any behavior; it just makes the return
values more conventional.This changes pnp_assign_dma() from a void function to one that
returns an int, just like the other assignment functions. For
now, at least, pnp_assign_dma() always returns 0 (success), so
it appears to never fail, just like before.Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Acked-by: Rene Herman
Signed-off-by: Len Brown -
When we fail to assign an I/O or MEM resource, include the min/max
in the debug output to help match it with the options.Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Acked-by: Rene Herman
Signed-off-by: Len Brown -
This adds a typedef for the IRQ bitmap, which should cause
no functional change, but will make it easier to pass a
pointer to a bitmap to pnp_register_irq_resource().Signed-off-by: Bjorn Helgaas
Signed-off-by: Andi Kleen
Acked-by: Rene Herman
Signed-off-by: Len Brown -
PNP used to have a fixed-size pnp_resource_table for tracking the
resources used by a device. This table often overflowed, so we've
had to increase the table size, which wastes memory because most
devices have very few resources.This patch replaces the table with a linked list of resources where
the entries are allocated on demand.This removes messages like these:
pnpacpi: exceeded the max number of IO resources
00:01: too many I/O port resourcesReferences:
http://bugzilla.kernel.org/show_bug.cgi?id=9535
http://bugzilla.kernel.org/show_bug.cgi?id=9740
http://lkml.org/lkml/2007/11/30/110This patch also changes the way PNP uses the IORESOURCE_UNSET,
IORESOURCE_AUTO, and IORESOURCE_DISABLED flags.Prior to this patch, the pnp_resource_table entries used the flags
like this:IORESOURCE_UNSET
This table entry is unused and available for use. When this flag
is set, we shouldn't look at anything else in the resource structure.
This flag is set when a resource table entry is initialized.IORESOURCE_AUTO
This resource was assigned automatically by pnp_assign_{io,mem,etc}().This flag is set when a resource table entry is initialized and
cleared whenever we discover a resource setting by reading an ISAPNP
config register, parsing a PNPBIOS resource data stream, parsing an
ACPI _CRS list, or interpreting a sysfs "set" command.Resources marked IORESOURCE_AUTO are reinitialized and marked as
IORESOURCE_UNSET by pnp_clean_resource_table() in these cases:- before we attempt to assign resources automatically,
- if we fail to assign resources automatically,
- after disabling a deviceIORESOURCE_DISABLED
Set by pnp_assign_{io,mem,etc}() when automatic assignment fails.
Also set by PNPBIOS and PNPACPI for:- invalid IRQs or GSI registration failures
- invalid DMA channels
- I/O ports above 0x10000
- mem ranges with negative lengthAfter this patch, there is no pnp_resource_table, and the resource list
entries use the flags like this:IORESOURCE_UNSET
This flag is no longer used in PNP. Instead of keeping
IORESOURCE_UNSET entries in the resource list, we remove
entries from the list and free them.IORESOURCE_AUTO
No change in meaning: it still means the resource was assigned
automatically by pnp_assign_{port,mem,etc}(), but these functions
now set the bit explicitly.We still "clean" a device's resource list in the same places,
but rather than reinitializing IORESOURCE_AUTO entries, we
just remove them from the list.Note that IORESOURCE_AUTO entries are always at the end of the
list, so removing them doesn't reorder other list entries.
This is because non-IORESOURCE_AUTO entries are added by the
ISAPNP, PNPBIOS, or PNPACPI "get resources" methods and by the
sysfs "set" command. In each of these cases, we completely free
the resource list first.IORESOURCE_DISABLED
In addition to the cases where we used to set this flag, ISAPNP now
adds an IORESOURCE_DISABLED resource when it reads a configuration
register with a "disabled" value.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown
Signed-off-by: Andi Kleen -
We used pnp_resource.index to keep track of which ISAPNP configuration
register a resource should be written to. We needed this only to
handle the case where a register is disabled but a subsequent register
in the same set is enabled.Rather than explicitly maintaining the pnp_resource.index, this patch
adds a resource every time we read an ISAPNP configuration register
and marks the resource as IORESOURCE_DISABLED when appropriate. This
makes the position in the pnp_resource_table always correspond to the
config register index.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown
Signed-off-by: Andi Kleen
29 Apr, 2008
12 commits
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Save the ISAPNP config register index in the struct pnp_resource.
We need this because it is important to write ISAPNP configuration
back to the same registers we read it from. For example, if we
read valid regions from memory descriptors 0, 1, and 3, we'd
better write them back to the same registers, without compressing
them to descriptors 0, 1, and 2.This was previously guaranteed by using the index into the
pnp_resource_table array as the ISAPNP config register index.
However, I am removing those fixed-size arrays, so we need to
save the ISAPNP register index elsewhere.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown -
This patch adds a "struct pnp_resource". This currently
contains only a struct resource, but we will soon need
additional PNP-specific information.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown -
There are no remaining references to the PNP_MAX_* constants or
the pnp_resource_table structure outside of the PNP core. Make
them private to the PNP core.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown -
This removes more direct references to pnp_resource_table from the
pnp_assign_resources() path and the /sys user interface path.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown -
The caller already has the struct resource pointer, so no need for
pnp_check_port(), pnp_check_mem(), etc., to look it up again.Signed-off-by: Bjorn Helgaas
Acked-By: Rene Herman
Signed-off-by: Len Brown -
Use a temporary "res" pointer to replace repeated lookups in
the pnp resource tables.Signed-off-by: Bjorn Helgaas
Acked-By: Rene Herman
Signed-off-by: Len Brown -
Move the common part of pnp_init_resource_table() and
pnp_clean_resource_table() into a new pnp_init_resource().
This reduces a little code duplication and will be
useful later to initialize an individual resource.Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown -
Rene Herman recently removed the only in-tree
driver uses of:pnp_init_resource_table()
pnp_manual_config_dev()
pnp_resource_change()in this change:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=109c53f840e551d6e99ecfd8b0131a968332c89f
These are no longer used in the PNP core either, so we can just remove
them completely.It's possible that there are out-of-tree drivers that use these
interfaces. They should be changed to either (1) use PNP quirks
to work around broken hardware or firmware, or (2) use the sysfs
interfaces to control resource usage from userspace.Signed-off-by: Bjorn Helgaas
Acked-By: Rene Herman
Signed-off-by: Len Brown -
This changes pnp_clean_resource_table() to take a pnp_dev pointer
rather than a pnp_resource_table pointer. This reduces the visibility
of pnp_resource_table and removes an opportunity for error in the
caller.Signed-off-by: Bjorn Helgaas
Acked-By: Rene Herman
Signed-off-by: Len Brown -
Add pnp_init_resources(struct pnp_dev *) to replace
pnp_init_resource_table(), which takes a pointer to the
pnp_resource_table itself. Passing only the pnp_dev * reduces
the possibility for error in the caller and removes the
pnp_resource_table implementation detail from the interface.Even though pnp_init_resource_table() is exported, I did not
export pnp_init_resources() because it is used only by the PNP
core.Signed-off-by: Bjorn Helgaas
Acked-By: Rene Herman
Signed-off-by: Len Brown -
This patch adds code to dump PNP resources before and after
assigning resources and before writing them to the device.This is enabled by CONFIG_PNP_DEBUG=y.
Signed-off-by: Bjorn Helgaas
Signed-off-by: Len Brown -
When we call protocol->get() and protocol->set() methods, we currently
supply pointers to both the pnp_dev and the pnp_resource_table even
though the pnp_resource_table should always be the one associated with
the pnp_dev.This removes the pnp_resource_table arguments to make it clear that
these methods only operate on the specified pnp_dev.Signed-off-by: Bjorn Helgaas
Acked-By: Rene Herman
Signed-off-by: Len Brown
07 Feb, 2008
2 commits
-
Changed the isapnp semaphore to a mutex.
[akpm@linux-foundation.org: no externs-in-c]
[akpm@linux-foundation.org: build fix]
Signed-off-by: Daniel Walker
Cc: Bjorn Helgaas
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make pnp_activate_dev() and pnp_disable_dev() return only 0 (success) or a
negative error value, as pci_enable_device() and pci_disable_device() do.Previously they returned:
0: device was already active (or disabled)
1: we just activated (or disabled) device
Cc: Adam Belay
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Oct, 2007
2 commits
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If we have the struct pnp_dev available, we can use dev_info(), dev_err(),
etc., to give a little more information and consistency.[akpm@linux-foundation.org: fix warning]
Signed-off-by: Bjorn Helgaas
Cc: Adam Belay
Cc: Len Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Most drivers for devices supporting ISA DMA can operate without DMA as well
(falling back zo PIO). Thus it seems inappropriate for PNP to fail device
initialization in case none of the possible DMA channels are available.
Instead, it should be left to the driver to decide what to do if
request_dma() fails.The patch at once adjusts the code to account for the fact that
pnp_assign_dma() now doesn't need to report failure anymore.Signed-off-by: Jan Beulich
Cc: Adam Belay
Cc: Bjorn Helgaas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
16 Oct, 2007
1 commit
-
Signed-off-by: Jaroslav Kysela
24 Aug, 2007
2 commits
-
Remove some null pointer checks. Null pointers in these areas indicate
programming errors, and I think it's better to oops immediately rather
than return an error that is easily ignored.Signed-off-by: Bjorn Helgaas
Acked-by: Adam Belay
Signed-off-by: Len Brown -
More manual fixups after Lindent. No functional change.
Signed-off-by: Bjorn Helgaas
Acked-by: Adam Belay
Signed-off-by: Len Brown
27 Jul, 2007
2 commits
-
These are manual fixups after running Lindent. No functional change.
Signed-off-by: Bjorn Helgaas
Cc: Len Brown
Cc: Adam Belay
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Run Lindent on all PNP source files.
Produced by:
$ quilt new pnp-lindent
$ find drivers/pnp -name \*.[ch] | xargs quilt add
$ quilt add include/linux/{pnp.h,pnpbios.h}
$ scripts/Lindent drivers/pnp/*.c drivers/pnp/*/*.c include/linux/pnp*.h
$ quilt refresh --sortSigned-off-by: Bjorn Helgaas
Cc: Len Brown
Cc: Adam Belay
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Mar, 2007
1 commit
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Make some normal code paths in PNP stop issuing syslog spam. Since PNP
issues calls regardless of device capablities, it's no surprise when some
of those devices don't support those calls!Signed-off-by: David Brownell
Cc: Adam Belay
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
01 Jul, 2006
1 commit
-
Signed-off-by: Jörn Engel
Signed-off-by: Adrian Bunk
28 Jun, 2006
1 commit
-
Based on a patch series originally from Vivek Goyal
Cc: Vivek Goyal
Signed-off-by: Andrew Morton
Signed-off-by: Greg Kroah-Hartman
20 Apr, 2006
1 commit
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The wording of two messages in drivers/pnp/manager.c is incorrect. Fix that.
Signed-off-by: Jan Engelhardt
Acked-by: Pavel Machek
Signed-off-by: Rafael J. Wysocki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
03 Jan, 2006
1 commit
-
Also use the PnP functions to start/stop the devices during the suspend so
that drivers will not have to duplicate this code.Cc: Adam Belay
Cc: Jaroslav Kysela
Cc: Takashi IwaiSigned-off-by: Pierre Ossman
Signed-off-by: Andrew Morton
Signed-off-by: Takashi Iwai
