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The CXL specification claims S3 support at a hardware level, but at a system software level there are some missing pieces. Section 9.4 (CXL 2.0) rightly claims that "CXL mem adapters may need aux power to retain memory context across S3", but there is no enumeration mechanism for the OS to determine if a given adapter has that support. Moreover the save state and resume image for the system may inadvertantly end up in a CXL device that needs to be restored before the save state is recoverable. I.e. a circular dependency that is not resolvable without a third party save-area. Arrange for the cxl_mem driver to fail S3 attempts. This still nominaly allows for suspend, but requires unbinding all CXL memory devices before the suspend to ensure the typical DRAM flow is taken. The cxl_mem unbind flow is intended to also tear down all CXL memory regions associated with a given cxl_memdev. It is reasonable to assume that any device participating in a System RAM range published in the EFI memory map is covered by aux power and save-area outside the device itself. So this restriction can be minimized in the future once pre-existing region enumeration support arrives, and perhaps a spec update to clarify if the EFI memory map is sufficent for determining the range of devices managed by platform-firmware for S3 support. Per Rafael, if the CXL configuration prevents suspend then it should fail early before tasks are frozen, and mem_sleep should stop showing 'mem' as an option [1]. Effectively CXL augments the platform suspend ->valid() op since, for example, the ACPI ops are not aware of the CXL / PCI dependencies. Given the split role of platform firmware vs OS provisioned CXL memory it is up to the cxl_mem driver to determine if the CXL configuration has elements that platform firmware may not be prepared to restore. Link: https://lore.kernel.org/r/CAJZ5v0hGVN_=3iU8OLpHY3Ak35T5+JcBM-qs8SbojKrpd0VXsA@mail.gmail.com [1] Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Len Brown <len.brown@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/165066828317.3907920.5690432272182042556.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
191 lines
5.3 KiB
Makefile
191 lines
5.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the Linux kernel device drivers.
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#
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# 15 Sep 2000, Christoph Hellwig <hch@infradead.org>
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# Rewritten to use lists instead of if-statements.
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#
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obj-y += irqchip/
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obj-y += bus/
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obj-$(CONFIG_GENERIC_PHY) += phy/
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# GPIO must come after pinctrl as gpios may need to mux pins etc
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obj-$(CONFIG_PINCTRL) += pinctrl/
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obj-$(CONFIG_GPIOLIB) += gpio/
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obj-y += pwm/
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obj-y += pci/
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obj-$(CONFIG_PARISC) += parisc/
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obj-$(CONFIG_RAPIDIO) += rapidio/
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obj-y += video/
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obj-y += idle/
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# IPMI must come before ACPI in order to provide IPMI opregion support
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obj-y += char/ipmi/
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obj-$(CONFIG_ACPI) += acpi/
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# PnP must come after ACPI since it will eventually need to check if acpi
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# was used and do nothing if so
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obj-$(CONFIG_PNP) += pnp/
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obj-y += amba/
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obj-y += clk/
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# Many drivers will want to use DMA so this has to be made available
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# really early.
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obj-$(CONFIG_DMADEVICES) += dma/
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# SOC specific infrastructure drivers.
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obj-y += soc/
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obj-y += virtio/
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obj-$(CONFIG_VDPA) += vdpa/
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obj-$(CONFIG_XEN) += xen/
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# regulators early, since some subsystems rely on them to initialize
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obj-$(CONFIG_REGULATOR) += regulator/
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# reset controllers early, since gpu drivers might rely on them to initialize
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obj-$(CONFIG_RESET_CONTROLLER) += reset/
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# tty/ comes before char/ so that the VT console is the boot-time
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# default.
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obj-y += tty/
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obj-y += char/
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# iommu/ comes before gpu as gpu are using iommu controllers
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obj-y += iommu/
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# gpu/ comes after char for AGP vs DRM startup and after iommu
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obj-y += gpu/
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obj-$(CONFIG_CONNECTOR) += connector/
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# i810fb and intelfb depend on char/agp/
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obj-$(CONFIG_FB_I810) += video/fbdev/i810/
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obj-$(CONFIG_FB_INTEL) += video/fbdev/intelfb/
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obj-$(CONFIG_PARPORT) += parport/
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obj-y += base/ block/ misc/ mfd/ nfc/
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obj-$(CONFIG_LIBNVDIMM) += nvdimm/
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obj-$(CONFIG_DAX) += dax/
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obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf/
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obj-$(CONFIG_NUBUS) += nubus/
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obj-y += cxl/
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obj-y += macintosh/
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obj-y += scsi/
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obj-y += nvme/
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obj-$(CONFIG_ATA) += ata/
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obj-$(CONFIG_TARGET_CORE) += target/
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obj-$(CONFIG_MTD) += mtd/
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obj-$(CONFIG_SPI) += spi/
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obj-$(CONFIG_SPMI) += spmi/
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obj-$(CONFIG_HSI) += hsi/
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obj-$(CONFIG_SLIMBUS) += slimbus/
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obj-y += net/
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obj-$(CONFIG_ATM) += atm/
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obj-$(CONFIG_FUSION) += message/
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obj-y += firewire/
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obj-$(CONFIG_UIO) += uio/
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obj-$(CONFIG_VFIO) += vfio/
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obj-y += cdrom/
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obj-y += auxdisplay/
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obj-$(CONFIG_PCCARD) += pcmcia/
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obj-$(CONFIG_DIO) += dio/
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obj-$(CONFIG_SBUS) += sbus/
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obj-$(CONFIG_ZORRO) += zorro/
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obj-$(CONFIG_ATA_OVER_ETH) += block/aoe/
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obj-$(CONFIG_PARIDE) += block/paride/
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obj-$(CONFIG_TC) += tc/
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obj-$(CONFIG_USB_PHY) += usb/
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obj-$(CONFIG_USB) += usb/
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obj-$(CONFIG_USB_SUPPORT) += usb/
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obj-$(CONFIG_PCI) += usb/
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obj-$(CONFIG_USB_GADGET) += usb/
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obj-$(CONFIG_OF) += usb/
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obj-$(CONFIG_SERIO) += input/serio/
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obj-$(CONFIG_GAMEPORT) += input/gameport/
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obj-$(CONFIG_INPUT) += input/
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obj-$(CONFIG_RTC_LIB) += rtc/
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obj-y += i2c/ i3c/ media/
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obj-$(CONFIG_PPS) += pps/
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obj-y += ptp/
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obj-$(CONFIG_W1) += w1/
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obj-y += power/
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obj-$(CONFIG_HWMON) += hwmon/
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obj-$(CONFIG_THERMAL) += thermal/
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obj-$(CONFIG_WATCHDOG) += watchdog/
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obj-$(CONFIG_MD) += md/
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obj-$(CONFIG_BT) += bluetooth/
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obj-$(CONFIG_ACCESSIBILITY) += accessibility/
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obj-$(CONFIG_ISDN) += isdn/
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obj-$(CONFIG_EDAC) += edac/
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obj-$(CONFIG_EISA) += eisa/
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obj-$(CONFIG_PM_OPP) += opp/
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obj-$(CONFIG_CPU_FREQ) += cpufreq/
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obj-$(CONFIG_CPU_IDLE) += cpuidle/
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obj-y += mmc/
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obj-$(CONFIG_MEMSTICK) += memstick/
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obj-$(CONFIG_NEW_LEDS) += leds/
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obj-$(CONFIG_INFINIBAND) += infiniband/
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obj-y += firmware/
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obj-$(CONFIG_CRYPTO) += crypto/
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obj-$(CONFIG_SUPERH) += sh/
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obj-y += clocksource/
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obj-$(CONFIG_DCA) += dca/
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obj-$(CONFIG_HID) += hid/
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obj-$(CONFIG_PPC_PS3) += ps3/
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obj-$(CONFIG_OF) += of/
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obj-$(CONFIG_SSB) += ssb/
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obj-$(CONFIG_BCMA) += bcma/
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obj-$(CONFIG_VHOST_RING) += vhost/
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obj-$(CONFIG_VHOST_IOTLB) += vhost/
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obj-$(CONFIG_VHOST) += vhost/
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obj-$(CONFIG_VLYNQ) += vlynq/
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obj-$(CONFIG_GREYBUS) += greybus/
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obj-$(CONFIG_COMEDI) += comedi/
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obj-$(CONFIG_STAGING) += staging/
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obj-y += platform/
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obj-$(CONFIG_MAILBOX) += mailbox/
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obj-$(CONFIG_HWSPINLOCK) += hwspinlock/
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obj-$(CONFIG_REMOTEPROC) += remoteproc/
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obj-$(CONFIG_RPMSG) += rpmsg/
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obj-$(CONFIG_SOUNDWIRE) += soundwire/
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# Virtualization drivers
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obj-$(CONFIG_VIRT_DRIVERS) += virt/
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obj-$(subst m,y,$(CONFIG_HYPERV)) += hv/
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obj-$(CONFIG_PM_DEVFREQ) += devfreq/
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obj-$(CONFIG_EXTCON) += extcon/
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obj-$(CONFIG_MEMORY) += memory/
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obj-$(CONFIG_IIO) += iio/
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obj-$(CONFIG_VME_BUS) += vme/
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obj-$(CONFIG_IPACK_BUS) += ipack/
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obj-$(CONFIG_NTB) += ntb/
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obj-$(CONFIG_POWERCAP) += powercap/
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obj-$(CONFIG_MCB) += mcb/
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obj-$(CONFIG_PERF_EVENTS) += perf/
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obj-$(CONFIG_RAS) += ras/
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obj-$(CONFIG_USB4) += thunderbolt/
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obj-$(CONFIG_CORESIGHT) += hwtracing/coresight/
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obj-y += hwtracing/intel_th/
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obj-$(CONFIG_STM) += hwtracing/stm/
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obj-$(CONFIG_ANDROID) += android/
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obj-$(CONFIG_NVMEM) += nvmem/
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obj-$(CONFIG_FPGA) += fpga/
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obj-$(CONFIG_FSI) += fsi/
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obj-$(CONFIG_TEE) += tee/
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obj-$(CONFIG_MULTIPLEXER) += mux/
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obj-$(CONFIG_UNISYS_VISORBUS) += visorbus/
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obj-$(CONFIG_SIOX) += siox/
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obj-$(CONFIG_GNSS) += gnss/
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obj-$(CONFIG_INTERCONNECT) += interconnect/
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obj-$(CONFIG_COUNTER) += counter/
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obj-$(CONFIG_MOST) += most/
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obj-$(CONFIG_PECI) += peci/
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