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c5552fde10
linux_dsm_epyc7002/drivers
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Andy Lutomirski c5552fde10 nvme: Enable autonomous power state transitions 
NVMe devices can advertise multiple power states.  These states can
be either "operational" (the device is fully functional but possibly
slow) or "non-operational" (the device is asleep until woken up).
Some devices can automatically enter a non-operational state when
idle for a specified amount of time and then automatically wake back
up when needed.

The hardware configuration is a table.  For each state, an entry in
the table indicates the next deeper non-operational state, if any,
to autonomously transition to and the idle time required before
transitioning.

This patch teaches the driver to program APST so that each successive
non-operational state will be entered after an idle time equal to 100%
of the total latency (entry plus exit) associated with that state.
The maximum acceptable latency is controlled using dev_pm_qos
(e.g. power/pm_qos_latency_tolerance_us in sysfs); non-operational
states with total latency greater than this value will not be used.
As a special case, setting the latency tolerance to 0 will disable
APST entirely.  On hardware without APST support, the sysfs file will
not be exposed.

The latency tolerance for newly-probed devices is set by the module
parameter nvme_core.default_ps_max_latency_us.

In theory, the device can expose "default" APST table, but this
doesn't seem to function correctly on my device (Samsung 950), nor
does it seem particularly useful.  There is also an optional
mechanism by which a configuration can be "saved" so it will be
automatically loaded on reset.  This can be configured from
userspace, but it doesn't seem useful to support in the driver.

On my laptop, enabling APST seems to save nearly 1W.

The hardware tables can be decoded in userspace with nvme-cli.
'nvme id-ctrl /dev/nvmeN' will show the power state table and
'nvme get-feature -f 0x0c -H /dev/nvme0' will show the current APST
configuration.

This feature is quirked off on a known-buggy Samsung device.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-02-22 13:34:00 -07:00
..
accessibility
acpi ACPI updates for v4.11-rc1 2017-02-20 17:55:15 -08:00
amba
android
ata Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
atm Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
auxdisplay auxdisplay: fix new ht16k33 build errors 2017-01-11 09:27:30 +01:00
base Generic device properties framework updates for v4.11-rc1 2017-02-20 18:06:09 -08:00
bcma Revert "bcma: init serial console directly from ChipCommon code" 2017-01-17 14:23:44 +02:00
block cciss: Remove kmalloc cast 2017-02-22 11:54:49 -07:00
bluetooth Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-12-16 10:24:44 -08:00
bus cpu/hotplug: Cleanup state names 2016-12-25 10:47:44 +01:00
cdrom Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
char Revert "hwrng: core - zeroize buffers with random data" 2017-02-08 18:06:03 -08:00
clk PM / OPP: Update OPP users to put reference 2017-01-30 09:22:21 +01:00
clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 10:06:32 -08:00
connector
cpufreq Power management updates for v4.11-rc1 2017-02-20 17:41:31 -08:00
cpuidle cpuidle/menu: add per CPU PM QoS resume latency consideration 2017-01-30 11:03:32 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-02-06 14:16:23 -08:00
dax libnvdimm for 4.10 2016-12-18 15:49:10 -08:00
dca
devfreq Merge branch 'pm-devfreq' 2017-02-20 14:23:40 +01:00
dio Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
dma Merge branches 'iommu/fixes', 'arm/exynos', 'arm/renesas', 'arm/smmu', 'arm/mediatek', 'arm/core', 'x86/vt-d' and 'core' into next 2017-02-10 15:13:10 +01:00
dma-buf
edac Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 12:47:44 -08:00
eisa
extcon extcon: return error code on failure 2017-01-11 09:11:39 +01:00
firewire
firmware efi/libstub: Make file I/O chunking x86-specific 2017-02-07 10:42:11 +01:00
fmc
fpga
gpio gpio: provide lockdep keys for nested/unnested irqchips 2017-01-19 09:57:20 +01:00
gpu Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
hid Merge branches 'for-4.10/upstream-fixes', 'for-4.11/intel-ish', 'for-4.11/mayflash', 'for-4.11/microsoft', 'for-4.11/rmi', 'for-4.11/upstream' and 'for-4.11/wacom' into for-linus 2017-02-20 15:01:57 +01:00
hsi
hv Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read() 2017-01-31 10:59:48 +01:00
hwmon hwmon: (sht15) Add device tree support 2017-02-16 06:49:05 -08:00
hwspinlock
hwtracing coresight/etm3/4x: Consolidate hotplug state space 2016-12-25 10:47:44 +01:00
i2c Generic device properties framework updates for v4.11-rc1 2017-02-20 18:06:09 -08:00
ide Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
idle Power management material for v4.10-rc1 2016-12-13 10:41:53 -08:00
iio iio: dht11: Use usleep_range instead of msleep for start signal 2017-01-22 13:35:40 +00:00
infiniband Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
input Input: elan_i2c - add ELAN0605 to the ACPI table 2017-02-12 18:36:49 -08:00
iommu Merge branches 'iommu/fixes', 'arm/exynos', 'arm/renesas', 'arm/smmu', 'arm/mediatek', 'arm/core', 'x86/vt-d' and 'core' into next 2017-02-10 15:13:10 +01:00
ipack
irqchip IOMMU Updates for Linux v4.11 2017-02-20 16:42:43 -08:00
isdn isdn: Convert obsolete cputime type to nsecs 2017-02-01 09:13:50 +01:00
leds leds: ledtrig-heartbeat: Make top brightness adjustable 2017-02-14 22:20:24 +01:00
lguest Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
lightnvm lightnvm: set default lun range when no luns are specified 2017-02-15 08:27:21 -07:00
macintosh macintosh/rack-meter: Convert cputime64_t use to u64 2017-02-01 09:13:47 +01:00
mailbox ktime: Cleanup ktime_set() usage 2016-12-25 17:21:22 +01:00
mcb
md for-4.11/linus-merge-signed 2017-02-21 10:57:33 -08:00
media media fixes for v4.10-rc9 2017-02-16 10:22:41 -08:00
memory
memstick Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
message block: split scsi_request out of struct request 2017-01-27 15:08:35 -07:00
mfd mfd: lpc_ich: Add support for Intel Apollo Lake SoC 2017-01-03 17:34:16 +00:00
misc Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
mmc Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
mtd for-4.11/linus-merge-signed 2017-02-21 10:57:33 -08:00
net vxlan: fix oops in dev_fill_metadata_dst 2017-02-17 15:32:06 -05:00
nfc
ntb ntb: ntb_hw_intel: link_poll isn't clearing the pending status properly 2017-02-16 23:11:26 -05:00
nubus Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
nvdimm libnvdimm, pfn: fix memmap reservation size versus 4K alignment 2017-02-04 14:47:31 -08:00
nvme nvme: Enable autonomous power state transitions 2017-02-22 13:34:00 -07:00
nvmem nvmem: fix nvmem_cell_read() return type doc 2017-01-04 18:22:47 +01:00
of pci-v4.10-changes 2016-12-15 12:46:48 -08:00
oprofile Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
parisc Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
parport parisc, parport_gsc: Fixes for printk continuation lines 2017-01-28 21:54:21 +01:00
pci Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
pcmcia drivers/pcmcia/m32r_pcc.c: check return from add_pcc_socket 2016-12-12 18:55:06 -08:00
perf cpu/hotplug: Cleanup state names 2016-12-25 10:47:44 +01:00
phy SCSI misc on 20161213 2016-12-14 10:49:33 -08:00
pinctrl pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler 2017-01-30 15:53:57 +01:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 16:26:57 -08:00
pnp Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
power power: supply: add AC power supply driver for AXP20X and AXP22X PMICs 2017-01-29 23:15:18 +01:00
powercap
pps
ps3
ptp Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-12 19:56:15 -08:00
pwm pwm: Changes for v4.10-rc1 2016-12-15 11:45:13 -08:00
rapidio
ras
regulator regulator: Updates for v4.11 2017-02-20 17:23:57 -08:00
remoteproc Revert "remoteproc: Merge table_ptr and cached_table pointers" 2016-12-30 03:26:31 -08:00
reset reset: fix shared reset triggered_count decrement on error 2017-02-17 08:11:47 +01:00
rpmsg rpmsg: virtio_rpmsg_bus: fix channel creation 2016-12-30 03:12:11 -08:00
rtc rtc: jz4740: make the driver buildable as a module again 2017-01-26 23:03:21 +01:00
s390 Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
sbus Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
scsi scsi_transport_sas: fix BSG ioctl memory corruption 2017-02-21 14:18:54 -07:00
sfi
sh lib: radix-tree: check accounting of existing slot replacement users 2016-12-12 18:55:08 -08:00
sn
soc soc: ti: wkup_m3_ipc: Fix error return code in wkup_m3_ipc_probe() 2017-01-12 13:37:49 -08:00
spi ACPI updates for v4.11-rc1 2017-02-20 17:55:15 -08:00
spmi
ssb
staging Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
target for-4.11/linus-merge-signed 2017-02-21 10:57:33 -08:00
tc
thermal Merge branch 'pm-opp' 2017-02-20 14:22:50 +01:00
thunderbolt Char/Misc driver patches for 4.10-rc1 2016-12-13 12:11:01 -08:00
tty Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
uio
usb Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-20 13:23:30 -08:00
uwb
vfio IOMMU Updates for Linux v4.11 2017-02-20 16:42:43 -08:00
vhost vhost: fix initialization for vq->is_le 2017-02-03 23:38:57 +02:00
video fbdev: color map copying bounds checking 2017-01-24 16:26:14 -08:00
virt
virtio Revert "vring: Force use of DMA API for ARM-based systems with legacy devices" 2017-02-03 23:38:50 +02:00
vlynq
vme vme: Fix wrong pointer utilization in ca91cx42_slave_get 2017-01-11 10:42:16 +01:00
w1
watchdog Watchdog updates for v4.10 2016-12-24 11:27:45 -08:00
xen Merge branch 'stable/for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb 2017-01-27 12:17:07 -08:00
zorro Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
Kconfig
Makefile