Commit Graph

214 Commits

Author SHA1 Message Date
Pedro F. Giffuni
71e3c3083b sys/powerpc: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:09:59 +00:00
Mark Johnston
b999e9c813 Implement mmu_page_init for AIM platforms.
As of r323290 we cannot rely on the vm_page array being
zero-initialized.

Reported and tested by:	andreast
MFC after:	1 week
2017-09-17 15:40:12 +00:00
Mark Johnston
dbbaf04f1e Remove support for idle page zeroing.
Idle page zeroing has been disabled by default on all architectures since
r170816 and has some bugs that make it seemingly unusable. Specifically,
the idle-priority pagezero thread exacerbates contention for the free page
lock, and yields the CPU without releasing it in non-preemptive kernels. The
pagezero thread also does not behave correctly when superpage reservations
are enabled: its target is a function of v_free_count, which includes
reserved-but-free pages, but it is only able to zero pages belonging to the
physical memory allocator.

Reviewed by:	alc, imp, kib
Differential Revision:	https://reviews.freebsd.org/D7714
2016-09-03 20:38:13 +00:00
Nathan Whitehorn
0081393d79 Do not rely on firmware having pre-enabled the MMU in a reasonable way for
late boot: enable it explicitly after installing the page tables. If booting
from an FDT, also make sure to escape the firmware's MMU context early
before overwriting firmware page tables.

Approved by:	re (gjb)
2016-06-29 14:40:43 +00:00
Pedro F. Giffuni
d9c9c81c08 sys: use our roundup2/rounddown2() macros when param.h is available.
rounddown2 tends to produce longer lines than the original code
and when the code has a high indentation level it was not really
advantageous to do the replacement.

This tries to strike a balance between readability using the macros
and flexibility of having the expressions, so not everything is
converted.
2016-04-21 19:57:40 +00:00
Justin Hibbits
54ac2713d5 Add VM_MEMATTR_CACHEABLE support for AIM, for parity with Book-E.
Not used right now, but may be in the future anyway.
2016-03-01 00:50:39 +00:00
Konstantin Belousov
edc8222303 Make kstack_pages a tunable on arm, x86, and powepc. On i386, the
initial thread stack is not adjusted by the tunable, the stack is
allocated too early to get access to the kernel environment. See
TD0_KSTACK_PAGES for the thread0 stack sizing on i386.

The tunable was tested on x86 only.  From the visual inspection, it
seems that it might work on arm and powerpc.  The arm
USPACE_SVC_STACK_TOP and powerpc USPACE macros seems to be already
incorrect for the threads with non-default kstack size.  I only
changed the macros to use variable instead of constant, since I cannot
test.

On arm64, mips and sparc64, some static data structures are sized by
KSTACK_PAGES, so the tunable is disabled.

Sponsored by:	The FreeBSD Foundation
MFC after:	2 week
2015-08-10 17:18:21 +00:00
Jason A. Harmening
713841afb2 Add two new pmap functions:
vm_offset_t pmap_quick_enter_page(vm_page_t m)
void pmap_quick_remove_page(vm_offset_t kva)

These will create and destroy a temporary, CPU-local KVA mapping of a specified page.

Guarantees:
--Will not sleep and will not fail.
--Safe to call under a non-sleepable lock or from an ithread

Restrictions:
--Not guaranteed to be safe to call from an interrupt filter or under a spin mutex on all platforms
--Current implementation does not guarantee more than one page of mapping space across all platforms. MI code should not make nested calls to pmap_quick_enter_page.
--MI code should not perform locking while holding onto a mapping created by pmap_quick_enter_page

The idea is to use this in busdma, for bounce buffer copies as well as virtually-indexed cache maintenance on mips and arm.

NOTE: the non-i386, non-amd64 implementations of these functions still need review and testing.

Reviewed by:	kib
Approved by:	kib (mentor)
Differential Revision:	http://reviews.freebsd.org/D3013
2015-08-04 19:46:13 +00:00
Justin Hibbits
0936003e3d Use the correct type for physical addresses.
On Book-E, physical addresses are actually 36-bits, not 32-bits.  This is
currently worked around by ignoring the top bits.  However, in some cases, the
boot loader configures CCSR to something above the 32-bit mark.  This is stage 1
in updating the pmap to handle 36-bit physaddr.
2015-07-04 19:00:38 +00:00
Nathan Whitehorn
d1295abdc0 Move Book-E/AIM dependent bits for setting user PMAP during thread switch
out of cpu_switch() and into pmap_activate() where they belong. This also
removes all the #ifdef from cpu_switch().
2015-03-04 16:45:31 +00:00
Rui Paulo
29d0137a8d Remove FreeBSD/wii.
This port failed to gain traction and probably only a couple Wii consoles
ran FreeBSD all the way to single user mode with an md(4). IPC
support was never implemented, so it was impossible to use any peripheral

Any further development, if any, will happen at https://github.com/rpaulo/wii.

Discussed with:	nathanw (a long time ago), jhibbits
2015-02-10 06:35:16 +00:00
Mark Johnston
bdb9ab0dd9 Factor out duplicated code from dumpsys() on each architecture into generic
code in sys/kern/kern_dump.c. Most dumpsys() implementations are nearly
identical and simply redefine a number of constants and helper subroutines;
a generic implementation will make it easier to implement features around
kernel core dumps. This change does not alter any minidump code and should
have no functional impact.

PR:		193873
Differential Revision:	https://reviews.freebsd.org/D904
Submitted by:	Conrad Meyer <conrad.meyer@isilon.com>
Reviewed by:	jhibbits (earlier version)
Sponsored by:	EMC / Isilon Storage Division
2015-01-07 01:01:39 +00:00
Konstantin Belousov
39ffa8c138 Change pmap_enter(9) interface to take flags parameter and superpage
mapping size (currently unused).  The flags includes the fault access
bits, wired flag as PMAP_ENTER_WIRED, and a new flag
PMAP_ENTER_NOSLEEP to indicate that pmap should not sleep.

For powerpc aim both 32 and 64 bit, fix implementation to ensure that
the requested mapping is created when PMAP_ENTER_NOSLEEP is not
specified, in particular, wait for the available memory required to
proceed.

In collaboration with:	alc
Tested by:	nwhitehorn (ppc aim32 and booke)
Sponsored by:	The FreeBSD Foundation and EMC / Isilon Storage Division
MFC after:	2 weeks
2014-08-08 17:12:03 +00:00
Alan Cox
a695d9b25b Retire pmap_change_wiring(). We have never used it to wire virtual pages.
We continue to use pmap_enter() for that.  For unwiring virtual pages, we
now use pmap_unwire(), which unwires a range of virtual addresses instead
of a single virtual page.

Sponsored by:	EMC / Isilon Storage Division
2014-08-03 20:40:51 +00:00
Alan Cox
081b8e203b Simplify the selection of the pvo_head and pvo allocation zone in
moea_enter_locked() and moea64_enter().

Eliminate an unused variable from moea64_enter().
2014-08-01 17:09:50 +00:00
Alan Cox
eb2af3e758 Retire PVO_EXECUTABLE. It's neither used nor set correctly. 2014-08-01 04:53:35 +00:00
Alan Cox
add0359068 Correct a long-standing problem in moea{,64}_pvo_enter() that was revealed
by the combination of r268591 and r269134: When we attempt to add the
wired attribute to an existing mapping, moea{,64}_pvo_enter() do nothing.
(They only set the wired attribute on newly created mappings.)

Tested by:	andreast
2014-08-01 01:48:41 +00:00
Alan Cox
f26bcf99e0 Eliminate an unused variable. Refresh two comments. 2014-07-13 17:52:07 +00:00
Alan Cox
a844c68fc2 Implement pmap_unwire(). See r268327 for the motivation behind this change. 2014-07-13 16:27:57 +00:00
Alan Cox
bfc30490a7 Correct the accounting code for wired mappings. The wrong field of the PVO
entry was being tested.  We were incrementing and decrementing the pmap's
wired mapping count based on whether the physical page being mapped or
unmapped was cache coherent, not whether it was a wired mapping.

Reviewed by:	nwhitehorn
2014-07-10 20:55:38 +00:00
Ed Maste
0fcefb433d Update NetBSD Foundation copyrights to 2-clause BSD
The NetBSD Foundation states "Third parties are encouraged to change the
license on any files which have a 4-clause license contributed to the
NetBSD Foundation to a 2-clause license."

This change removes clauses 3 and 4 from copyright / license blocks that
list The NetBSD Foundation as the only copyright holder.

Sponsored by:	The FreeBSD Foundation
2014-03-18 01:40:25 +00:00
Justin Hibbits
fe938c0835 Use a loop of dcbz, instead of calling bzero() to zero a page. This matches
what is done in mmu_oea64.c.

MFC after:	1 month
2014-01-29 05:58:08 +00:00
Nathan Whitehorn
258dbffe6e Clean up missed header references. 2013-10-26 17:54:31 +00:00
Alan Cox
deb179bb4c The pmap function pmap_clear_reference() is no longer used. Remove it.
pmap_clear_reference() has had exactly one caller in the kernel for
several years, more precisely, since FreeBSD 8.  Now, that call no
longer exists.

Approved by:	re (kib)
Sponsored by:	EMC / Isilon Storage Division
2013-09-20 04:30:18 +00:00
Konstantin Belousov
e68c64f0ba Revert r254501. Instead, reuse the type stability of the struct pmap
which is the part of struct vmspace, allocated from UMA_ZONE_NOFREE
zone.  Initialize the pmap lock in the vmspace zone init function, and
remove pmap lock initialization and destruction from pmap_pinit() and
pmap_release().

Suggested and reviewed by:	alc (previous version)
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
2013-08-22 18:12:24 +00:00
Attilio Rao
c7aebda8a1 The soft and hard busy mechanism rely on the vm object lock to work.
Unify the 2 concept into a real, minimal, sxlock where the shared
acquisition represent the soft busy and the exclusive acquisition
represent the hard busy.
The old VPO_WANTED mechanism becames the hard-path for this new lock
and it becomes per-page rather than per-object.
The vm_object lock becames an interlock for this functionality:
it can be held in both read or write mode.
However, if the vm_object lock is held in read mode while acquiring
or releasing the busy state, the thread owner cannot make any
assumption on the busy state unless it is also busying it.

Also:
- Add a new flag to directly shared busy pages while vm_page_alloc
  and vm_page_grab are being executed.  This will be very helpful
  once these functions happen under a read object lock.
- Move the swapping sleep into its own per-object flag

The KPI is heavilly changed this is why the version is bumped.
It is very likely that some VM ports users will need to change
their own code.

Sponsored by:	EMC / Isilon storage division
Discussed with:	alc
Reviewed by:	jeff, kib
Tested by:	gavin, bapt (older version)
Tested by:	pho, scottl
2013-08-09 11:11:11 +00:00
Jeff Roberson
5df87b21d3 Replace kernel virtual address space allocation with vmem. This provides
transparent layering and better fragmentation.

 - Normalize functions that allocate memory to use kmem_*
 - Those that allocate address space are named kva_*
 - Those that operate on maps are named kmap_*
 - Implement recursive allocation handling for kmem_arena in vmem.

Reviewed by:	alc
Tested by:	pho
Sponsored by:	EMC / Isilon Storage Division
2013-08-07 06:21:20 +00:00
Justin Hibbits
a3b2cab451 Remove an unnecessary panic. The PVO's PTE entry and the PTEG's PTE entry may
not match, if the PVO's PTE is invalid.
2013-08-06 02:58:16 +00:00
Justin Hibbits
804d1cc1b6 Evict pages from the PTEG when it's full and trying to insert a new PTE,
rather than panicking.

Reviewed by:	nwhitehorn
MFC after:	3 weeks
2013-08-06 01:01:15 +00:00
Attilio Rao
9af6d512f5 o Relax locking assertions for vm_page_find_least()
o Relax locking assertions for pmap_enter_object() and add them also
  to architectures that currently don't have any
o Introduce VM_OBJECT_LOCK_DOWNGRADE() which is basically a downgrade
  operation on the per-object rwlock
o Use all the mechanisms above to make vm_map_pmap_enter() to work
  mostl of the times only with readlocks.

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc
2013-05-21 20:38:19 +00:00
Alan Cox
658f180b3b Relax the object locking assertion in pmap_enter_locked().
Reviewed by:	attilio
Sponsored by:	EMC / Isilon Storage Division
2013-05-17 18:59:00 +00:00
Justin Hibbits
70c29e3930 Remove a comment that shouldn't have gone in.
X-MFC-with:	r249864
2013-04-26 05:18:18 +00:00
Justin Hibbits
afd9cb6c6d Introduce kernel coredumps to ppc32 AIM. Leeched from the booke code.
MFC after:	2 weeks
2013-04-25 00:39:43 +00:00
Konstantin Belousov
e8a4a618cf Add pmap function pmap_copy_pages(), which copies the content of the
pages around, taking array of vm_page_t both for source and
destination.  Starting offsets and total transfer size are specified.

The function implements optimal algorithm for copying using the
platform-specific optimizations.  For instance, on the architectures
were the direct map is available, no transient mappings are created,
for i386 the per-cpu ephemeral page frame is used.  The code was
typically borrowed from the pmap_copy_page() for the same
architecture.

Only i386/amd64, powerpc aim and arm/arm-v6 implementations were
tested at the time of commit. High-level code, not committed yet to
the tree, ensures that the use of the function is only allowed after
explicit enablement.

For sparc64, the existing code has known issues and a stab is added
instead, to allow the kernel linking.

Sponsored by:	The FreeBSD Foundation
Tested by:	pho (i386, amd64), scottl (amd64), ian (arm and arm-v6)
MFC after:	2 weeks
2013-03-14 20:18:12 +00:00
Attilio Rao
89f6b8632c Switch the vm_object mutex to be a rwlock. This will enable in the
future further optimizations where the vm_object lock will be held
in read mode most of the time the page cache resident pool of pages
are accessed for reading purposes.

The change is mostly mechanical but few notes are reported:
* The KPI changes as follow:
  - VM_OBJECT_LOCK() -> VM_OBJECT_WLOCK()
  - VM_OBJECT_TRYLOCK() -> VM_OBJECT_TRYWLOCK()
  - VM_OBJECT_UNLOCK() -> VM_OBJECT_WUNLOCK()
  - VM_OBJECT_LOCK_ASSERT(MA_OWNED) -> VM_OBJECT_ASSERT_WLOCKED()
    (in order to avoid visibility of implementation details)
  - The read-mode operations are added:
    VM_OBJECT_RLOCK(), VM_OBJECT_TRYRLOCK(), VM_OBJECT_RUNLOCK(),
    VM_OBJECT_ASSERT_RLOCKED(), VM_OBJECT_ASSERT_LOCKED()
* The vm/vm_pager.h namespace pollution avoidance (forcing requiring
  sys/mutex.h in consumers directly to cater its inlining functions
  using VM_OBJECT_LOCK()) imposes that all the vm/vm_pager.h
  consumers now must include also sys/rwlock.h.
* zfs requires a quite convoluted fix to include FreeBSD rwlocks into
  the compat layer because the name clash between FreeBSD and solaris
  versions must be avoided.
  At this purpose zfs redefines the vm_object locking functions
  directly, isolating the FreeBSD components in specific compat stubs.

The KPI results heavilly broken by this commit.  Thirdy part ports must
be updated accordingly (I can think off-hand of VirtualBox, for example).

Sponsored by:	EMC / Isilon storage division
Reviewed by:	jeff
Reviewed by:	pjd (ZFS specific review)
Discussed with:	alc
Tested by:	pho
2013-03-09 02:32:23 +00:00
Attilio Rao
dc1558d1cd Merge from vmobj-rwlock:
VM_OBJECT_LOCKED() macro is only used to implement a custom version
of lock assertions right now (which likely spread out thanks to
copy and paste).
Remove it and implement actual assertions.

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc
Tested by:	pho
2013-02-27 18:12:13 +00:00
Attilio Rao
590f9303e5 Merge from vmobj-rwlock branch:
Remove unused inclusion of vm/vm_pager.h and vm/vnode_pager.h.

Sponsored by:	EMC / Isilon storage division
Tested by:	pho
Reviewed by:	alc
2013-02-26 01:00:11 +00:00
Adrian Chadd
aef8ef5168 Setup BAT0 and BAT1 on the Wii.
This is the missing piece for FreeBSD/Wii, but there's still a lot of
work ahead. We have to reset the MMU in locore before continuing
the boot process because we don't know how the boot loaders might
have setup the BATs. We also disable the PCI BAT because there's no PCI
bus on the Wii.

Thanks to Nathan Whitehorn and Peter Grenhan for their help.

Submitted by:	Margarida Gouveia
2012-11-21 08:04:21 +00:00
Attilio Rao
cfedf924d3 Rework the known rwlock to benefit about staying on their own
cache line in order to avoid manual frobbing but using
struct rwlock_padalign.

Reviewed by:	alc, jimharris
2012-11-03 23:03:14 +00:00
Alan Cox
e4b8a2fc5a Eliminate a stale comment. It describes another use case for the pmap in
Mach that doesn't exist in FreeBSD.
2012-09-28 05:30:59 +00:00
Alan Cox
8d9e6d9f93 Avoid recursion on the pvh global lock in the aim oea pmap.
Correct the return type of the pmap_ts_referenced() implementations.

Reported by:	jhibbits [1]
Tested by:	andreast
2012-07-10 22:10:21 +00:00
Alan Cox
3653f5cbcb Replace all uses of the vm page queues lock by a r/w lock that is private
to this pmap.

Tested by:	andreast, jhibbits
2012-07-06 02:18:49 +00:00
Rafal Jaworowski
20b7961267 Fix physical address type to vm_paddr_t. 2012-05-24 21:13:24 +00:00
Nathan Whitehorn
ccc4a5c761 Replace the list of PVOs owned by each PMAP with an RB tree. This simplifies
range operations like pmap_remove() and pmap_protect() as well as allowing
simple operations like pmap_extract() not to involve any global state.
This substantially reduces lock coverages for the global table lock and
improves concurrency.
2012-05-20 14:33:28 +00:00
Nathan Whitehorn
e3c2930d36 We don't need kcopy() in any of the remaining places it is used, so
remove it.

MFC after:	2 weeks
2012-04-11 22:23:50 +00:00
Nathan Whitehorn
805bee55eb Fix error in r233949. Synchronizing icaches on uncacheable pages turns out
not to be a good idea, and of course the PV entry list for a page is never
empty after the page has been mapped.
2012-04-11 20:28:05 +00:00
Nathan Whitehorn
57bd5cce62 Reduce the frequency that the PowerPC/AIM pmaps invalidate instruction
caches, by invalidating kernel icaches only when needed and not flushing
user caches for shared pages.

Suggested by:	kib
MFC after:	2 weeks
2012-04-06 16:03:38 +00:00
Nathan Whitehorn
cbfa304088 Use LIST_FOREACH_SAFE() instead of LIST_FOREACH() in pmap_remove(), since
the point of this loop is to remove elements. This worked by accident before.

MFC after:	2 days
2012-03-14 20:19:49 +00:00
Nathan Whitehorn
e347e23bfe Allow this to work on embedded systems without Open Firmware by making
lack of a /chosen non-fatal, and manually removing memory in use by the
kernel from the physical memory map.

Submitted by:	rpaulo
2011-12-16 23:46:05 +00:00
Nathan Whitehorn
598d99ddee Keep track of PVO entries in each pmap, which allows much faster
pmap_remove() for large sparse requests. This can prevent pmap_remove()
operations on 64-bit process destruction or swapout that would take
several hundred times the lifetime of the universe to complete. This
behavior is largely indistinguishable from a hang.
2011-12-11 17:19:48 +00:00