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33 .Nm rman_activate_resource ,
34 .Nm rman_adjust_resource ,
35 .Nm rman_await_resource ,
36 .Nm rman_deactivate_resource ,
39 .Nm rman_init_from_resource ,
40 .Nm rman_is_region_manager ,
41 .Nm rman_manage_region ,
42 .Nm rman_first_free_region ,
43 .Nm rman_last_free_region ,
44 .Nm rman_release_resource ,
45 .Nm rman_reserve_resource ,
46 .Nm rman_reserve_resource_bound ,
47 .Nm rman_make_alignment_flags ,
53 .Nm rman_set_virtual ,
54 .Nm rman_get_virtual ,
57 .Nm rman_set_bushandle ,
58 .Nm rman_get_bushandle ,
61 .Nd resource management functions
65 .Fn rman_activate_resource "struct resource *r"
67 .Fn rman_adjust_resource "struct resource *r" "u_long start" "u_long end"
69 .Fn rman_await_resource "struct resource *r" "int pri2" "int timo"
71 .Fn rman_deactivate_resource "struct resource *r"
73 .Fn rman_fini "struct rman *rm"
75 .Fn rman_init "struct rman *rm"
77 .Fn rman_init_from_resource "struct rman *rm" "struct resource *r"
79 .Fn rman_is_region_manager "struct resource *r" "struct rman *rm"
81 .Fn rman_manage_region "struct rman *rm" "u_long start" "u_long end"
83 .Fn rman_first_free_region "struct rman *rm" "u_long *start" "u_long *end"
85 .Fn rman_last_free_region "struct rman *rm" "u_long *start" "u_long *end"
87 .Fn rman_release_resource "struct resource *r"
88 .Ft "struct resource *"
89 .Fo rman_reserve_resource
90 .Fa "struct rman *rm" "u_long start" "u_long end" "u_long count"
91 .Fa "u_int flags" "struct device *dev"
93 .Ft "struct resource *"
94 .Fo rman_reserve_resource_bound
95 .Fa "struct rman *rm" "u_long start" "u_long end" "u_long count"
96 .Fa "u_long bound" "u_int flags" "struct device *dev"
99 .Fn rman_make_alignment_flags "uint32_t size"
101 .Fn rman_get_start "struct resource *r"
103 .Fn rman_get_end "struct resource *r"
104 .Ft "struct device *"
105 .Fn rman_get_device "struct resource *r"
107 .Fn rman_get_size "struct resource *r"
109 .Fn rman_get_flags "struct resource *r"
111 .Fn rman_set_virtual "struct resource *r" "void *v"
113 .Fn rman_get_virtual "struct resource *r"
115 .Fn rman_set_bustag "struct resource *r" "bus_space_tag_t t"
117 .Fn rman_get_bustag "struct resource *r"
119 .Fn rman_set_bushandle "struct resource *r" "bus_space_handle_t h"
120 .Ft bus_space_handle_t
121 .Fn rman_get_bushandle "struct resource *r"
123 .Fn rman_set_rid "struct resource *r" "int rid"
125 .Fn rman_get_rid "struct resource *r"
129 set of functions provides a flexible resource management abstraction.
130 It is used extensively by the bus management code.
131 It implements the abstractions of region and resource.
132 A region descriptor is used to manage a region; this could be memory or
133 some other form of bus space.
135 Each region has a set of bounds.
136 Within these bounds, allocated segments may reside.
137 Each segment, termed a resource, has several properties which are
138 represented by a 16-bit flag register, as follows.
140 #define RF_ALLOCATED 0x0001 /* resource has been reserved */
141 #define RF_ACTIVE 0x0002 /* resource allocation has been activated */
142 #define RF_SHAREABLE 0x0004 /* resource permits contemporaneous sharing */
143 #define RF_TIMESHARE 0x0008 /* resource permits time-division sharing */
144 #define RF_WANTED 0x0010 /* somebody is waiting for this resource */
145 #define RF_FIRSTSHARE 0x0020 /* first in sharing list */
146 #define RF_PREFETCHABLE 0x0040 /* resource is prefetchable */
149 The remainder of the flag bits are used to represent the desired alignment
150 of the resource within the region.
154 function initializes the region descriptor, pointed to by the
156 argument, for use with the resource management functions.
157 It is required that the fields
163 be set before calling
171 shall be set to a string that describes the resource to be managed.
176 fields may be set to limit the range of acceptable resource addresses.
177 If these fields are not set,
179 will initialize them to allow the entire range of resource addresses.
180 It also initializes any mutexes associated with the structure.
183 fails to initalize the mutex, it will return
184 .Er ENOMEM ; otherwise it will return 0 and
190 function frees any structures associated with the structure
194 If any of the resources within the managed region have the
196 flag set, it will return
198 otherwise, any mutexes associated with the structure will be released
199 and destroyed, and the function will return 0.
202 .Fn rman_manage_region
203 function establishes the concept of a region which is under
208 argument points to the region descriptor.
213 arguments specify the bounds of the region.
215 .Fn rman_manage_region
217 If the region overlaps with an existing region, it will return
219 If any part of the region falls outside of the valid address range for
224 will be returned when
225 .Fn rman_manage_region
226 failed to allocate memory for the region.
229 .Fn rman_init_from_resource
230 function is a wrapper routine to create a resource manager backed by an
236 and then adds a region to
238 corresponding to the address range allocated to
241 .Fn rman_manage_region .
244 .Fn rman_first_free_region
246 .Fn rman_last_free_region
247 functions can be used to query a resource manager for its first
252 contains no free region,
253 these functions will return
259 are set to the bounds of the free region and zero is returned.
262 .Fn rman_reserve_resource_bound
263 function is where the bulk of the
266 It attempts to reserve a contiguous range in the specified region
268 for the use of the device
270 The caller can specify the
274 of an acceptable range,
275 as well as a boundary restriction and required aligment,
276 and the code will attempt to find a free segment which fits.
279 argument is the lowest acceptable starting value of the resource.
282 argument is the highest acceptable ending value of the resource.
284 .Fa start No + Fa count No \- 1
287 for any allocation to happen.
288 The aligment requirement
294 argument may be set to specify a boundary restriction such that an
295 allocated region may cross an address that is a multiple of the
299 argument must be a power of two.
300 It may be set to zero to specify no boundary restriction.
301 The default behavior is to allocate an exclusive segment, unless the
305 flags are set, in which case a shared
306 segment will be allocated.
307 If this shared segment already exists, the caller has its device
308 added to the list of consumers.
311 .Fn rman_reserve_resource
312 function is used to reserve resources within a previously established region.
313 It is a simplified interface to
314 .Fn rman_reserve_resource_bound
315 which passes 0 for the
320 .Fn rman_make_alignment_flags
321 function returns the flag mask corresponding to the desired alignment
323 This should be used when calling
324 .Fn rman_reserve_resource_bound .
327 .Fn rman_is_region_manager
328 function returns true if the allocated resource
336 .Fn rman_adjust_resource
337 function is used to adjust the reserved address range of an allocated resource
342 It can be used to grow or shrink one or both ends of the resource range.
343 The current implementation does not support entirely relocating the resource
346 if the new resource range does not overlap the old resource range.
347 If either end of the resource range grows and the new resource range would
348 conflict with another allocated resource,
349 the function will fail with
352 .Fn rman_adjust_resource
353 function does not support adjusting the resource range for shared resources
354 and will fail such attempts with
359 will have a start address of
361 and an end address of
363 and the function will return zero.
364 Note that none of the constraints of the original allocation request such
365 as alignment or boundary restrictions are checked by
366 .Fn rman_adjust_resource .
367 It is the caller's responsibility to enforce any such requirements.
370 .Fn rman_release_resource
371 function releases the reserved resource
373 It may attempt to merge adjacent free resources.
376 .Fn rman_activate_resource
377 function marks a resource as active, by setting the
380 If this is a time shared resource, and the caller has not yet acquired
381 the resource, the function returns
385 .Fn rman_deactivate_resource
386 function marks a resource
388 as inactive, by clearing the
391 If other consumers are waiting for this range, it will wakeup their threads.
394 .Fn rman_await_resource
395 function performs an asynchronous wait for a resource
397 to become inactive, that is, for the
400 It is used to enable cooperative sharing of a resource
401 which can only be safely used by one thread at a time.
407 .Fn rman_await_resource
416 functions return the bounds, size and flags of the previously reserved
422 function associates a
429 function is used to retrieve this tag once set.
432 .Fn rman_set_bushandle
433 function associates a
434 .Vt bus_space_handle_t
439 .Fn rman_get_bushandle
440 function is used to retrieve this handle once set.
444 function is used to associate a kernel virtual address with a resource
448 function can be used to retrieve the KVA once set.
452 function associates a resource identifier with a resource
456 function retrieves this RID.
460 function returns a pointer to the device which reserved the resource
463 .Xr bus_activate_resource 9 ,
464 .Xr bus_adjust_resource 9 ,
465 .Xr bus_alloc_resource 9 ,
466 .Xr bus_release_resource 9 ,
467 .Xr bus_set_resource 9 ,
470 This manual page was written by
471 .An Bruce M Simpson Aq bms@spc.org .