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bhnd(4): Fix resource allocation issues exposed by chipc PMU support.

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- Delete all chipc children on attachment failure.
- Added missing bhnd_nexus bhnd_bus_deactivate_resource implementation.
- Drop a CHIPC_UNLOCK() accidentally left behind after lifting
  synchronization into the chipc region refcounting API.
- Fix re-allocation of chipc resources. Previously, the resource ID was
  reset to -1 on release, preventing later re-allocation.

Approved by:	re (gjb), adrian (mentor)
Differential Revision:	 https://reviews.freebsd.org/D6849
This commit is contained in:
Landon J. Fuller 2016-06-16 19:57:24 +00:00
parent 5b4dc397af
commit 7d1fb1aadc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=301971
4 changed files with 43 additions and 18 deletions
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16
sys/dev/bhnd/bhnd_nexus.c
View File

@ -106,10 +106,26 @@ bhnd_nexus_activate_resource(device_t dev, device_t child, int type, int rid,
return (0);
}
static int
bhnd_nexus_deactivate_resource(device_t dev, device_t child,
int type, int rid, struct bhnd_resource *r)
{
int error;
/* Always direct */
KASSERT(r->direct, ("indirect resource delegated to bhnd_nexus\n"));
if ((error = bus_deactivate_resource(child, type, rid, r->res)))
return (error);
r->direct = false;
return (0);
}
static device_method_t bhnd_nexus_methods[] = {
/* bhnd interface */
DEVMETHOD(bhnd_bus_activate_resource, bhnd_nexus_activate_resource),
DEVMETHOD(bhnd_bus_deactivate_resource, bhnd_nexus_deactivate_resource),
DEVMETHOD(bhnd_bus_is_hw_disabled, bhnd_nexus_is_hw_disabled),
DEVMETHOD(bhnd_bus_get_attach_type, bhnd_nexus_get_attach_type),

6
sys/dev/bhnd/cores/chipc/chipc.c
View File

@ -282,6 +282,8 @@ chipc_attach(device_t dev)
return (0);
failed:
device_delete_children(sc->dev);
if (sc->core_region != NULL) {
chipc_release_region(sc, sc->core_region,
RF_ALLOCATED|RF_ACTIVE);
@ -878,10 +880,8 @@ chipc_alloc_resource(device_t dev, device_t child, int type,
}
/* Try to retain a region reference */
if ((error = chipc_retain_region(sc, cr, RF_ALLOCATED))) {
CHIPC_UNLOCK(sc);
if ((error = chipc_retain_region(sc, cr, RF_ALLOCATED)))
return (NULL);
}
/* Make our rman reservation */
rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,

8
sys/dev/bhnd/cores/chipc/chipc_private.h
View File

@ -84,11 +84,13 @@ struct chipc_region {
bhnd_addr_t cr_addr; /**< region base address */
bhnd_addr_t cr_end; /**< region end address */
bhnd_size_t cr_count; /**< region count */
int cr_rid; /**< rid, or -1 if no rid
* is allocated by the bus for
* this region */
int cr_rid; /**< rid to use when performing
resource allocation, or -1
if region has no assigned
resource ID */
struct bhnd_resource *cr_res; /**< bus resource, or NULL */
int cr_res_rid; /**< cr_res RID, if any. */
u_int cr_refs; /**< RF_ALLOCATED refcount */
u_int cr_act_refs; /**< RF_ACTIVE refcount */

31
sys/dev/bhnd/cores/chipc/chipc_subr.c
View File

@ -150,9 +150,10 @@ chipc_alloc_region(struct chipc_softc *sc, bhnd_port_type type,
cr->cr_end = cr->cr_addr + cr->cr_count - 1;
/* Note that not all regions have an assigned rid, in which case
* this will return -1 */
/* Fetch default resource ID for this region. Not all regions have an
* assigned rid, in which case this will return -1 */
cr->cr_rid = bhnd_get_port_rid(sc->dev, type, port, region);
return (cr);
failed:
@ -177,7 +178,7 @@ chipc_free_region(struct chipc_softc *sc, struct chipc_region *cr)
cr->cr_region_num, cr->cr_refs));
if (cr->cr_res != NULL) {
bhnd_release_resource(sc->dev, SYS_RES_MEMORY, cr->cr_rid,
bhnd_release_resource(sc->dev, SYS_RES_MEMORY, cr->cr_res_rid,
cr->cr_res);
}
@ -264,10 +265,16 @@ chipc_retain_region(struct chipc_softc *sc, struct chipc_region *cr, int flags)
KASSERT(cr->cr_res == NULL,
("non-NULL resource has refcount"));
cr->cr_res = bhnd_alloc_resource(sc->dev,
SYS_RES_MEMORY, &cr->cr_rid, cr->cr_addr,
cr->cr_end, cr->cr_count, 0);
/* Fetch initial resource ID */
if ((cr->cr_res_rid = cr->cr_rid) == -1) {
CHIPC_UNLOCK(sc);
return (EINVAL);
}
/* Allocate resource */
cr->cr_res = bhnd_alloc_resource(sc->dev,
SYS_RES_MEMORY, &cr->cr_res_rid, cr->cr_addr,
cr->cr_end, cr->cr_count, 0);
if (cr->cr_res == NULL) {
CHIPC_UNLOCK(sc);
return (ENXIO);
@ -287,7 +294,7 @@ chipc_retain_region(struct chipc_softc *sc, struct chipc_region *cr, int flags)
/* If this is the first reference, activate the resource */
if (cr->cr_act_refs == 0) {
error = bhnd_activate_resource(sc->dev, SYS_RES_MEMORY,
cr->cr_rid, cr->cr_res);
cr->cr_res_rid, cr->cr_res);
if (error) {
/* Drop any allocation reference acquired
* above */
@ -324,6 +331,8 @@ chipc_release_region(struct chipc_softc *sc, struct chipc_region *cr,
CHIPC_LOCK(sc);
error = 0;
KASSERT(cr->cr_res != NULL, ("release on NULL region resource"));
if (flags & RF_ACTIVE) {
KASSERT(cr->cr_act_refs > 0, ("RF_ACTIVE over-released"));
KASSERT(cr->cr_act_refs <= cr->cr_refs,
@ -332,7 +341,7 @@ chipc_release_region(struct chipc_softc *sc, struct chipc_region *cr,
/* If this is the last reference, deactivate the resource */
if (cr->cr_act_refs == 1) {
error = bhnd_deactivate_resource(sc->dev,
SYS_RES_MEMORY, cr->cr_rid, cr->cr_res);
SYS_RES_MEMORY, cr->cr_res_rid, cr->cr_res);
if (error)
goto done;
}
@ -343,16 +352,14 @@ chipc_release_region(struct chipc_softc *sc, struct chipc_region *cr,
if (flags & RF_ALLOCATED) {
KASSERT(cr->cr_refs > 0, ("overrelease of refs"));
/* If this is the last reference, release the resource */
if (cr->cr_refs == 1) {
error = bhnd_release_resource(sc->dev,
SYS_RES_MEMORY, cr->cr_rid, cr->cr_res);
error = bhnd_release_resource(sc->dev, SYS_RES_MEMORY,
cr->cr_res_rid, cr->cr_res);
if (error)
goto done;
cr->cr_res = NULL;
cr->cr_rid = -1;
}
/* Drop our allocation refcount */