John Baldwin bc153c692f Add a new bus method to fetch device-specific CPU sets. ... bus_get_cpus() returns a specified set of CPUs for a device. It accepts an enum for the second parameter that indicates the type of cpuset to request. Currently two valus are supported: - LOCAL_CPUS (on x86 this returns all the CPUs in the package closest to the device when DEVICE_NUMA is enabled) - INTR_CPUS (like LOCAL_CPUS but only returns 1 SMT thread for each core) For systems that do not support NUMA (or if it is not enabled in the kernel config), LOCAL_CPUS fails with EINVAL. INTR_CPUS is mapped to 'all_cpus' by default. The idea is that INTR_CPUS should always return a valid set. Device drivers which want to use per-CPU interrupts should start using INTR_CPUS instead of simply assigning interrupts to all available CPUs. In the future we may wish to add tunables to control the policy of INTR_CPUS (e.g. should it be local-only or global, should it ignore SMT threads or not). The x86 nexus driver exposes the internal set of interrupt CPUs from the the x86 interrupt code via INTR_CPUS. The ACPI bus driver and PCI bridge drivers use _PXM to return a suitable LOCAL_CPUS set when _PXM exists and DEVICE_NUMA is enabled. They also and the global INTR_CPUS set from the nexus driver with the per-domain set from _PXM to generate a local INTR_CPUS set for child devices. Reviewed by: wblock (manpage) Differential Revision: https://reviews.freebsd.org/D5519		2016-05-02 18:00:38 +00:00
..
acpica	Add a new bus method to fetch device-specific CPU sets.	2016-05-02 18:00:38 +00:00
bios
cpufreq	Cleanup unnecessary semicolons from the kernel.	2016-04-10 23:07:00 +00:00
include	Add x86 CPU features definitions published in the Intel SDM rev. 58.	2016-04-16 06:07:13 +00:00
iommu	sys: use our roundup2/rounddown2() macros when param.h is available.	2016-04-21 19:57:40 +00:00
isa	atrtc: export function to set RTC	2016-05-02 16:14:55 +00:00
pci	Convert rman to use rman_res_t instead of u_long	2016-01-27 02:23:54 +00:00
x86	Add a new bus method to fetch device-specific CPU sets.	2016-05-02 18:00:38 +00:00
xen	xen: Set ipi_{alloc,free} even for UP	2016-04-07 07:00:00 +00:00