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hwpmc: split out PMC_OP_PMCRELEASE

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Split out the functional logic from the syscall handler into a helper
function. This keeps it separate from the syscall control-flow logic,
resulting in better readability overall. It also wins back a level of
indentation.

Reviewed by:	jkoshy
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D40293
This commit is contained in:
Mitchell Horne 2023-06-14 13:33:35 -03:00
parent c514a571af
commit f4fac946c6
1 changed files with 38 additions and 28 deletions
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66
sys/dev/hwpmc/hwpmc_mod.c
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@ -3622,6 +3622,40 @@ pmc_do_op_pmcdetach(struct thread *td, struct pmc_op_pmcattach a)
return (error);
}
/*
* Main body of PMC_OP_PMCRELEASE.
*/
static int
pmc_do_op_pmcrelease(pmc_id_t pmcid)
{
struct pmc_owner *po;
struct pmc *pm;
int error;
/*
* Find PMC pointer for the named PMC.
*
* Use pmc_release_pmc_descriptor() to switch off the
* PMC, remove all its target threads, and remove the
* PMC from its owner's list.
*
* Remove the owner record if this is the last PMC
* owned.
*
* Free up space.
*/
error = pmc_find_pmc(pmcid, &pm);
if (error != 0)
return (error);
po = pm->pm_owner;
pmc_release_pmc_descriptor(pm);
pmc_maybe_remove_owner(po);
pmc_destroy_pmc_descriptor(pm);
return (error);
}
static int
pmc_syscall_handler(struct thread *td, void *syscall_args)
{
@ -4205,41 +4239,17 @@ pmc_syscall_handler(struct thread *td, void *syscall_args)
break;
/*
* Release an allocated PMC
* Release an allocated PMC.
*/
case PMC_OP_PMCRELEASE:
{
pmc_id_t pmcid;
struct pmc *pm;
struct pmc_owner *po;
struct pmc_op_simple sp;
/*
* Find PMC pointer for the named PMC.
*
* Use pmc_release_pmc_descriptor() to switch off the
* PMC, remove all its target threads, and remove the
* PMC from its owner's list.
*
* Remove the owner record if this is the last PMC
* owned.
*
* Free up space.
*/
if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
error = copyin(arg, &sp, sizeof(sp));
if (error != 0)
break;
pmcid = sp.pm_pmcid;
if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
break;
po = pm->pm_owner;
pmc_release_pmc_descriptor(pm);
pmc_maybe_remove_owner(po);
pmc_destroy_pmc_descriptor(pm);
error = pmc_do_op_pmcrelease(sp.pm_pmcid);
}
break;