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Dan Williams d18bc74ace cxl/region: Manage CPU caches relative to DPA invalidation events 
A "DPA invalidation event" is any scenario where the contents of a DPA
(Device Physical Address) is modified in a way that is incoherent with
CPU caches, or if the HPA (Host Physical Address) to DPA association
changes due to a remapping event.

PMEM security events like Unlock and Passphrase Secure Erase already
manage caches through LIBNVDIMM, so that leaves HPA to DPA remap events
that need cache management by the CXL core. Those only happen when the
boot time CXL configuration has changed. That event occurs when
userspace attaches an endpoint decoder to a region configuration, and
that region is subsequently activated.

The implications of not invalidating caches between remap events is that
reads from the region at different points in time may return different
results due to stale cached data from the previous HPA to DPA mapping.
Without a guarantee that the region contents after cxl_region_probe()
are written before being read (a layering-violation assumption that
cxl_region_probe() can not make) the CXL subsystem needs to ensure that
reads that precede writes see consistent results.

A CONFIG_CXL_REGION_INVALIDATION_TEST option is added to support debug
and unit testing of the CXL implementation in QEMU or other environments
where cpu_cache_has_invalidate_memregion() returns false. This may prove
too restrictive for QEMU where the HDM decoders are emulated, but in
that case the CXL subsystem needs some new mechanism / indication that
the HDM decoder is emulated and not a passthrough of real hardware.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166993222098.1995348.16604163596374520890.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2022-12-03 00:03:57 -08:00
..
accessibility
acpi nvdimm/region: Move cache management to the region driver 2022-12-02 23:52:32 -08:00
amba
android Scheduler changes for v6.1: 2022-10-10 09:10:28 -07:00
ata ata: palmld: fix return value check in palmld_pata_probe() 2022-10-31 20:28:05 +09:00
atm
auxdisplay
base ACPI and device properties fixes for 6.1-rc3 2022-10-28 16:48:29 -07:00
bcma Interrupt subsystem updates: 2022-10-12 10:23:24 -07:00
block block-6.1-2022-11-05 2022-11-05 09:02:28 -07:00
bluetooth Bluetooth: virtio_bt: Use skb_put to set length 2022-11-02 14:15:42 -07:00
bus Char/Misc and other driver changes for 6.1-rc1 2022-10-08 08:56:37 -07:00
cdrom
char random: use arch_get_random*_early() in random_init() 2022-10-29 00:24:03 +02:00
clk clk: qcom: Update the force mem core bit for GPU clocks 2022-10-27 17:23:29 -07:00
clocksource A boring time, timekeeping, timers update: 2022-10-10 10:16:00 -07:00
comedi
connector
counter counter: 104-quad-8: Fix race getting function mode and direction 2022-10-23 20:39:26 -04:00
cpufreq cpufreq: intel_pstate: hybrid: Use known scaling factor for P-cores 2022-10-25 15:09:23 +02:00
cpuidle RISC-V Patches for the 6.1 Merge Window, Part 1 2022-10-09 13:24:01 -07:00
crypto This update includes the following changes: 2022-10-10 13:04:25 -07:00
cxl cxl/region: Manage CPU caches relative to DPA invalidation events 2022-12-03 00:03:57 -08:00
dax libnvdimm for 6.1 2022-10-14 18:41:41 -07:00
dca
devfreq PM / devfreq: rockchip-dfi: Fix an error message 2022-09-26 03:59:43 +09:00
dio
dma treewide: use get_random_bytes() when possible 2022-10-11 17:42:58 -06:00
dma-buf whack-a-mole: cropped up open-coded file_inode() uses... 2022-10-06 17:22:11 -07:00
edac Merge patch series "Use composable cache instead of L2 cache" 2022-10-13 11:07:13 -07:00
eisa
extcon Char/Misc and other driver changes for 6.1-rc1 2022-10-08 08:56:37 -07:00
firewire
firmware Second batch of EFI fixes for v6.1 2022-11-04 14:37:25 -07:00
fpga Char/Misc and other driver changes for 6.1-rc1 2022-10-08 08:56:37 -07:00
fsi fsi: core: Check error number after calling ida_simple_get 2022-09-28 21:10:57 +09:30
gnss
gpio gpio: tegra: Convert to immutable irq chip 2022-10-20 13:47:54 +02:00
gpu Merge tag 'drm-intel-fixes-2022-11-03' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes 2022-11-04 09:30:18 +10:00
greybus
hid for-linus-2022102101 2022-10-21 17:41:57 -07:00
hsi
hte
hv hyperv-next for 6.1 2022-10-10 13:59:01 -07:00
hwmon Revert "hwmon: (pmbus) Add regulator supply into macro" 2022-11-04 16:47:01 -07:00
hwspinlock
hwtracing coresight: cti: Fix hang in cti_disable_hw() 2022-10-25 19:08:07 +02:00
i2c i2c: i801: add lis3lv02d's I2C address for Vostro 5568 2022-11-01 13:46:30 +01:00
i3c i3c: master: Remove the wrong place of reattach. 2022-10-12 23:45:29 +02:00
idle
iio iio: bmc150-accel-core: Fix unsafe buffer attributes 2022-10-17 08:51:26 +01:00
infiniband RDMA/qedr: clean up work queue on failure in qedr_alloc_resources() 2022-10-28 12:59:40 -03:00
input Input updates for 6.1 merge window: 2022-10-11 10:53:25 -07:00
interconnect
iommu iommu/vt-d: Clean up si_domain in the init_dmars() error path 2022-10-21 10:49:35 +02:00
ipack Char/Misc and other driver changes for 6.1-rc1 2022-10-08 08:56:37 -07:00
irqchip Interrupt subsystem updates: 2022-10-12 10:23:24 -07:00
isdn isdn: mISDN: netjet: fix wrong check of device registration 2022-11-02 12:34:48 +00:00
leds leds: simatic-ipc-leds-gpio: fix incorrect LED to GPIO mapping 2022-10-24 11:32:10 +02:00
macintosh powerpc updates for 6.1 2022-10-09 14:05:15 -07:00
mailbox mailbox: qcom-ipcc: flag IRQ NO_THREAD 2022-10-05 21:51:58 -05:00
mcb
md dm clone: Fix typo in block_device format specifier 2022-10-18 17:17:48 -04:00
media media: vivid: set num_in/outputs to 0 if not supported 2022-10-25 16:43:34 +01:00
memory
memstick
message
mfd Revert "mfd: syscon: Remove repetition of the regmap_get_val_endian()" 2022-10-23 12:04:56 -07:00
misc misc: sgi-gru: use explicitly signed char 2022-10-25 19:12:10 +02:00
mmc mmc: sdhci_am654: 'select', not 'depends' REGMAP_MMIO 2022-10-26 11:48:03 +02:00
most
mtd mtd: parsers: bcm47xxpart: Fix halfblock reads 2022-10-18 11:20:12 +02:00
mux
net stmmac: dwmac-loongson: fix invalid mdio_node 2022-11-02 20:30:51 -07:00
nfc nfc: nfcmrvl: Fix potential memory leak in nfcmrvl_i2c_nci_send() 2022-10-30 21:43:26 +00:00
ntb
nubus
nvdimm nvdimm/region: Move cache management to the region driver 2022-12-02 23:52:32 -08:00
nvme block-6.1-2022-10-28 2022-10-29 18:06:52 -07:00
nvmem nvmem: u-boot-env: fix crc32 casting type 2022-09-24 14:56:37 +02:00
of Devicetree updates for v6.1: 2022-10-10 13:13:51 -07:00
opp
parisc parisc: Export iosapic_serial_irq() symbol for serial port driver 2022-10-27 09:12:05 +02:00
parport
pci PCI: Allow drivers to request exclusive config regions 2022-11-14 10:07:22 -08:00
pcmcia pcmcia: remove AT91RM9200 Compact Flash driver 2022-09-27 08:12:16 +02:00
peci
perf arm64 fixes: 2022-10-14 12:38:03 -07:00
phy pci-v6.1-changes 2022-10-11 11:08:18 -07:00
pinctrl pinctrl: ocelot: Fix incorrect trigger of the interrupt. 2022-10-18 10:42:10 +02:00
platform LoongArch fixes for v6.1-rc3 2022-10-30 09:44:06 -07:00
pnp Merge branches 'acpi-apei', 'acpi-wakeup', 'acpi-reboot' and 'acpi-thermal' 2022-10-10 18:11:11 +02:00
power power supply and reset changes for the v6.1 series 2022-10-07 11:48:30 -07:00
powercap Scheduler changes for v6.1: 2022-10-10 09:10:28 -07:00
pps
ps3
ptp ] ptp: ocp: remove symlink for second GNSS 2022-10-10 08:37:24 +01:00
pwm pwm: Changes for v6.1-rc1 2022-10-07 11:32:10 -07:00
rapidio
ras
regulator - Core Frameworks 2022-10-07 11:24:20 -07:00
remoteproc remoteproc: virtio: Fix warning on bindings by removing the of_match_table 2022-10-05 09:20:44 -06:00
reset Here's the main clk pull request for this merge window. We have some 2022-10-08 10:06:48 -07:00
rpmsg
rtc rtc: cmos: fix build on non-ACPI platforms 2022-10-18 22:36:54 +02:00
s390 s390/vfio-ap: Fix memory allocation for mdev_types array 2022-10-26 14:47:31 +02:00
sbus
scsi SCSI fixes on 20221028 2022-10-29 18:12:45 -07:00
sh
siox
slimbus slimbus: qcom-ngd: Add error handling in of_qcom_slim_ngd_register 2022-09-24 14:53:06 +02:00
soc soc: imx: imx93-pd: Fix the error handling path of imx93_pd_probe() 2022-10-29 16:26:32 +08:00
soundwire soundwire updates for 6.1-rc1 2022-10-07 16:13:55 -07:00
spi spi: Fixes for v6.1 2022-10-26 17:38:46 -07:00
spmi spmi: pmic-arb: increase SPMI transaction timeout delay 2022-09-30 14:33:23 +02:00
ssb
staging media fixes for v6.1-rc2 2022-10-22 15:30:15 -07:00
target Merge branch '6.1/scsi-queue' into 6.1/scsi-fixes 2022-10-21 01:10:34 +00:00
tc
tee - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
thermal thermal: intel_powerclamp: Use first online CPU as control_cpu 2022-10-15 19:33:57 +02:00
thunderbolt treewide: use get_random_u32() when possible 2022-10-11 17:42:58 -06:00
tty parisc/serial: Rename 8250_gsc.c to 8250_parisc.c 2022-10-21 08:10:46 +02:00
ufs scsi: ufs: core: Fix typo in comment 2022-10-22 03:29:32 +00:00
uio
usb fbdev fixes for kernel 6.1-rc3: 2022-10-30 11:31:14 -07:00
vdpa virtio: fixes, features 2022-10-10 14:02:53 -07:00
vfio VFIO updates for v6.1-rc1 2022-10-12 14:46:48 -07:00
vhost virtio: fixes, features 2022-10-10 14:02:53 -07:00
video fbdev fixes for kernel 6.1-rc3: 2022-10-30 11:31:14 -07:00
virt Char/Misc and other driver changes for 6.1-rc1 2022-10-08 08:56:37 -07:00
virtio virtio_pci: use irq to detect interrupt support 2022-10-13 09:33:03 -04:00
vlynq
w1 Char/Misc and other driver changes for 6.1-rc1 2022-10-08 08:56:37 -07:00
watchdog linux-watchdog 6.1-rc4 tag 2022-11-01 12:21:53 -07:00
xen xen: branch for v6.1-rc2 2022-10-21 14:43:09 -07:00
zorro
Kconfig
Makefile