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LinuxKPI: implement cpumask_of()

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Add a static set of cpumasks for all (possible) cpus with only the one
indexed cpu enabled in each set.
This is needed for cpumask_of(_cpuid) which returns a cpumask (cpuset)
with only cpu _cpuid enabled and is used by one wireless driver at least.

MFC after:	3 days
Reviewed by:	emaste
Differential Revision: https://reviews.freebsd.org/D37223
This commit is contained in:
Bjoern A. Zeeb 2022-10-31 14:33:58 +00:00
parent dc9daa04fb
commit e2361e04b0
2 changed files with 24 additions and 0 deletions
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4
sys/compat/linuxkpi/common/include/linux/cpu.h
View File

@ -44,6 +44,8 @@ typedef cpuset_t cpumask_t;
extern cpumask_t cpu_online_mask;
cpumask_t *lkpi_get_static_single_cpu_mask(int);
static __inline int
cpumask_next(int cpuid, cpumask_t mask)
{
@ -73,4 +75,6 @@ cpumask_set_cpu(int cpu, cpumask_t *mask)
CPU_SET(cpu, mask);
}
#define cpumask_of(_cpu) (lkpi_get_static_single_cpu_mask(_cpu))
#endif /* _LINUXKPI_LINUX_CPU_H */

20
sys/compat/linuxkpi/common/src/linux_compat.c
View File

@ -132,6 +132,7 @@ static void linux_cdev_deref(struct linux_cdev *ldev);
static struct vm_area_struct *linux_cdev_handle_find(void *handle);
cpumask_t cpu_online_mask;
static cpumask_t static_single_cpu_mask[MAXCPU];
struct kobject linux_class_root;
struct device linux_root_device;
struct class linux_class_misc;
@ -2734,6 +2735,16 @@ bool linux_cpu_has_clflush;
struct cpuinfo_x86 boot_cpu_data;
#endif
cpumask_t *
lkpi_get_static_single_cpu_mask(int cpuid)
{
KASSERT((cpuid >= 0 && cpuid < MAXCPU), ("%s: invalid cpuid %d\n",
__func__, cpuid));
return (&static_single_cpu_mask[cpuid]);
}
static void
linux_compat_init(void *arg)
{
@ -2771,6 +2782,15 @@ linux_compat_init(void *arg)
init_waitqueue_head(&linux_var_waitq);
CPU_COPY(&all_cpus, &cpu_online_mask);
/*
* Generate a single-CPU cpumask_t for each CPU (possibly) in the system.
* CPUs are indexed from 0..(MAXCPU-1). The entry for cpuid 0 will only
* have itself in the cpumask, cupid 1 only itself on entry 1, and so on.
* This is used by cpumask_of() (and possibly others in the future) for,
* e.g., drivers to pass hints to irq_set_affinity_hint().
*/
for (i = 0; i < MAXCPU; i++)
CPU_SET(i, &static_single_cpu_mask[i]);
}
SYSINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_init, NULL);