diff options
author | jhb <jhb@FreeBSD.org> | 2016-05-20 17:57:47 +0000 |
---|---|---|
committer | jhb <jhb@FreeBSD.org> | 2016-05-20 17:57:47 +0000 |
commit | b4b2ae565200af6f37fec26de490a48783880ce4 (patch) | |
tree | 3aa16fa17a986984dd375052ea627ea43a7d21dd /sys/sys/rman.h | |
parent | 6f2769857a743d51ed1025cabba5e6b4c769fcfe (diff) | |
download | FreeBSD-src-b4b2ae565200af6f37fec26de490a48783880ce4.zip FreeBSD-src-b4b2ae565200af6f37fec26de490a48783880ce4.tar.gz |
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
Diffstat (limited to 'sys/sys/rman.h')
-rw-r--r-- | sys/sys/rman.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/sys/rman.h b/sys/sys/rman.h index 16899a9..9d1cd58 100644 --- a/sys/sys/rman.h +++ b/sys/sys/rman.h @@ -47,6 +47,7 @@ #define RF_FIRSTSHARE 0x0020 /* first in sharing list */ #define RF_PREFETCHABLE 0x0040 /* resource is prefetchable */ #define RF_OPTIONAL 0x0080 /* for bus_alloc_resources() */ +#define RF_UNMAPPED 0x0100 /* don't map resource when activating */ #define RF_ALIGNMENT_SHIFT 10 /* alignment size bit starts bit 10 */ #define RF_ALIGNMENT_MASK (0x003F << RF_ALIGNMENT_SHIFT) @@ -105,6 +106,7 @@ struct resource { }; struct resource_i; +struct resource_map; TAILQ_HEAD(resource_head, resource_i); @@ -127,6 +129,7 @@ bus_space_tag_t rman_get_bustag(struct resource *); rman_res_t rman_get_end(struct resource *); struct device *rman_get_device(struct resource *); u_int rman_get_flags(struct resource *); +void rman_get_mapping(struct resource *, struct resource_map *); int rman_get_rid(struct resource *); rman_res_t rman_get_size(struct resource *); rman_res_t rman_get_start(struct resource *); @@ -150,6 +153,7 @@ void rman_set_bushandle(struct resource *_r, bus_space_handle_t _h); void rman_set_bustag(struct resource *_r, bus_space_tag_t _t); void rman_set_device(struct resource *_r, struct device *_dev); void rman_set_end(struct resource *_r, rman_res_t _end); +void rman_set_mapping(struct resource *, struct resource_map *); void rman_set_rid(struct resource *_r, int _rid); void rman_set_start(struct resource *_r, rman_res_t _start); void rman_set_virtual(struct resource *_r, void *_v); |