freebsd-skq/sys/vm
jhb b4b2ae5652 Add new bus methods for mapping resources.
Add a pair of bus methods that can be used to "map" resources for direct
CPU access using bus_space(9).  bus_map_resource() creates a mapping and
bus_unmap_resource() releases a previously created mapping.  Mappings are
described by 'struct resource_map' object.  Pointers to these objects can
be passed as the first argument to the bus_space wrapper API used for bus
resources.

Drivers that wish to map all of a resource using default settings
(for example, using uncacheable memory attributes) do not need to change.
However, drivers that wish to use non-default settings can now do so
without jumping through hoops.

First, an RF_UNMAPPED flag is added to request that a resource is not
implicitly mapped with the default settings when it is activated.  This
permits other activation steps (such as enabling I/O or memory decoding
in a device's PCI command register) to be taken without creating a
mapping.  Right now the AGP drivers don't set RF_ACTIVE to avoid using
up a large amount of KVA to map the AGP aperture on 32-bit platforms.
Once RF_UNMAPPED is supported on all platforms that support AGP this
can be changed to using RF_UNMAPPED with RF_ACTIVE instead.

Second, bus_map_resource accepts an optional structure that defines
additional settings for a given mapping.

For example, a driver can now request to map only a subset of a resource
instead of the entire range.  The AGP driver could also use this to only
map the first page of the aperture (IIRC, it calls pmap_mapdev() directly
to map the first page currently).  I will also eventually change the
PCI-PCI bridge driver to request mappings of the subset of the I/O window
resource on its parent side to create mappings for child devices rather
than passing child resources directly up to nexus to be mapped.  This
also permits bridges that do address translation to request suitable
mappings from a resource on the "upper" side of the bus when mapping
resources on the "lower" side of the bus.

Another attribute that can be specified is an alternate memory attribute
for memory-mapped resources.  This can be used to request a
Write-Combining mapping of a PCI BAR in an MI fashion.  (Currently the
drivers that do this call pmap_change_attr() directly for x86 only.)

Note that this commit only adds the MI framework.  Each platform needs
to add support for handling RF_UNMAPPED and thew new
bus_map/unmap_resource methods.  Generally speaking, any drivers that
are calling rman_set_bustag() and rman_set_bushandle() need to be
updated.

Discussed on:	arch
Reviewed by:	cem
Differential Revision:	https://reviews.freebsd.org/D5237
2016-05-20 17:57:47 +00:00
..
_vm_radix.h
default_pager.c A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES(). 2015-12-16 21:30:45 +00:00
device_pager.c Avoid duplicated calls to pmap_page_get_memattr(). 2016-05-01 17:48:43 +00:00
memguard.c Include sys/_task.h into uma_int.h, so that taskqueue.h isn't a 2016-02-09 20:22:35 +00:00
memguard.h
phys_pager.c sys: use our roundup2/rounddown2() macros when param.h is available. 2016-04-21 19:57:40 +00:00
pmap.h Properly sort the function declarations added in r286296 2015-08-05 10:48:32 +00:00
redzone.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
redzone.h
sg_pager.c Plug a vm_page leak introduced in r292373. 2016-02-05 19:35:53 +00:00
swap_pager.c sys/vm: minor spelling fixes in comments. 2016-05-02 20:16:29 +00:00
swap_pager.h
uma_core.c sys/vm: minor spelling fixes in comments. 2016-05-02 20:16:29 +00:00
uma_dbg.c Include sys/_task.h into uma_int.h, so that taskqueue.h isn't a 2016-02-09 20:22:35 +00:00
uma_dbg.h Move uma_dbg_alloc() and uma_dbg_free() into uma_core.c, which allows 2016-02-03 22:02:36 +00:00
uma_int.h sys/vm: minor spelling fixes in comments. 2016-05-02 20:16:29 +00:00
uma.h Remove UMA_ZONE_REFCNT feature, now unused. 2016-03-01 00:33:32 +00:00
vm_domain.c Move vm_domain_rr_selectdomain() under #ifdef VM_NUMA_ALLOC. 2016-05-10 22:25:55 +00:00
vm_domain.h Add an initial NUMA affinity/policy configuration for threads and processes. 2015-07-11 15:21:37 +00:00
vm_extern.h Various cleanups to the main function for AIO kernel processes: 2016-01-19 21:37:51 +00:00
vm_fault.c Clean up the handling of errors from vm_pager_get_pages(). Mostly, this 2016-05-19 19:27:33 +00:00
vm_glue.c sys/vm: minor spelling fixes in comments. 2016-05-02 20:16:29 +00:00
vm_init.c Parallelize the buffer cache and rewrite getnewbuf(). This results in a 2015-10-14 02:10:07 +00:00
vm_kern.c Introduce a new mechanism for relocating virtual pages to a new physical 2015-12-19 18:42:50 +00:00
vm_kern.h
vm_map.c sys/vm: minor spelling fixes in comments. 2016-05-02 20:16:29 +00:00
vm_map.h Do not pretend that vm_fault(9) supports unwiring the address. Rename 2015-07-30 18:28:34 +00:00
vm_meter.c Remove the v_cache_min and v_cache_max sysctls. They are unused and have 2015-09-11 03:00:24 +00:00
vm_mmap.c Add a local variable initialization needed in the OBJT_DEFAULT case. 2015-07-05 22:26:19 +00:00
vm_object.c Add implementation of robust mutexes, hopefully close enough to the 2016-05-17 09:56:22 +00:00
vm_object.h Add implementation of robust mutexes, hopefully close enough to the 2016-05-17 09:56:22 +00:00
vm_page.c vm/vm_page.h: Fix trivial '-Wpointer-sign' warning 2016-05-19 17:54:14 +00:00
vm_page.h vm/vm_page.h: Fix trivial '-Wpointer-sign' warning 2016-05-19 17:54:14 +00:00
vm_pageout.c sys/vm: minor spelling fixes in comments. 2016-05-02 20:16:29 +00:00
vm_pageout.h Introduce a new mechanism for relocating virtual pages to a new physical 2015-12-19 18:42:50 +00:00
vm_pager.c Remove slightly used const values that can be replaced with nitems(). 2016-04-21 15:38:28 +00:00
vm_pager.h A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES(). 2015-12-16 21:30:45 +00:00
vm_param.h Remove the v_cache_min and v_cache_max sysctls. They are unused and have 2015-09-11 03:00:24 +00:00
vm_phys.c sys: use our roundup2/rounddown2() macros when param.h is available. 2016-04-21 19:57:40 +00:00
vm_phys.h Add more fine-grained kernel options for NUMA support. 2016-04-09 13:58:04 +00:00
vm_radix.c Cleanup redundant parenthesis from existing howmany()/roundup() macro uses. 2016-04-22 16:57:42 +00:00
vm_radix.h
vm_reserv.c Introduce a new mechanism for relocating virtual pages to a new physical 2015-12-19 18:42:50 +00:00
vm_reserv.h Introduce a new mechanism for relocating virtual pages to a new physical 2015-12-19 18:42:50 +00:00
vm_unix.c Implement lockless resource limits. 2015-06-10 10:48:12 +00:00
vm_zeroidle.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
vm.h Add new bus methods for mapping resources. 2016-05-20 17:57:47 +00:00
vnode_pager.c Add implementation of robust mutexes, hopefully close enough to the 2016-05-17 09:56:22 +00:00
vnode_pager.h A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES(). 2015-12-16 21:30:45 +00:00