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freebsd-src/sys/dev/acpica
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Alexander Motin 5bc10feacc acpi_cpu: Reduce BUS_MASTER_RLD manipulations 
Instead of setting and clearing BUS_MASTER_RLD register on every C3
state enter/exit, set it only once if the system supports C3 state
and we are going to "disable" bus master arbitration while in it.

This is what Linux does for the past 14 years, and for even more time
this register is not implemented in a relevant hardware.  Same time
since this is only a single bit in a bigger register, ACPI has to
do take a global lock and do read-modify-write for it, that is too
expensive, saved only by C3 not entered frequently, but enough to be
seen in idle system CPU profiles.

MFC after:	1 month
2023-12-25 21:43:20 -05:00
..
Osd pci_cfgreg: Add a PCI domain argument to the low-level register API 2023-11-29 10:31:47 -08:00
acpi.c x86: Support multiple PCI MCFG regions 2023-11-29 10:32:39 -08:00
acpi_acad.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_apei.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_battery.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_bus_if.m sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
acpi_button.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_cmbat.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_container.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
acpi_cpu.c acpi_cpu: Reduce BUS_MASTER_RLD manipulations 2023-12-25 21:43:20 -05:00
acpi_dock.c sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
acpi_ec.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_ged.c acpi_ged: Handle events directly 2023-10-12 11:27:44 -04:00
acpi_hpet.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_hpet.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
acpi_if.m sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
acpi_isab.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_lid.c acpi_lid: Remove duplicate events 2023-12-23 21:33:51 -05:00
acpi_package.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
acpi_pci.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_pci_link.c pci_cfgreg: Add a PCI domain argument to the low-level register API 2023-11-29 10:31:47 -08:00
acpi_pcib.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_pcib_acpi.c pci_cfgreg: Add a PCI domain argument to the low-level register API 2023-11-29 10:31:47 -08:00
acpi_pcib_pci.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_pcibvar.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
acpi_pcivar.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
acpi_perf.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_powerres.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_pxm.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_quirk.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
acpi_quirks sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
acpi_resource.c acpi: Add workaround for Altra I2C memory resource 2023-11-15 16:25:00 -05:00
acpi_smbat.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_smbus.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
acpi_thermal.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_throttle.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_timer.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpi_video.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
acpiio.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
acpivar.h sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00