From 9ea4dcf49878bb9546b8fa9319dcbdc9b7ee20f8 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 22 Apr 2022 15:58:11 -0700 Subject: [PATCH] PM: CXL: Disable suspend 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" Cc: Pavel Machek Cc: Len Brown Reviewed-by: Rafael J. Wysocki Link: https://lore.kernel.org/r/165066828317.3907920.5690432272182042556.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams --- drivers/Makefile | 2 +- drivers/cxl/Kconfig | 4 ++++ drivers/cxl/Makefile | 2 +- drivers/cxl/core/Makefile | 1 + drivers/cxl/core/suspend.c | 24 ++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 11 +++++++++++ drivers/cxl/mem.c | 22 +++++++++++++++++++++- include/linux/pm.h | 9 +++++++++ kernel/power/hibernate.c | 2 +- kernel/power/main.c | 5 ++++- kernel/power/suspend.c | 3 ++- 11 files changed, 79 insertions(+), 6 deletions(-) create mode 100644 drivers/cxl/core/suspend.c diff --git a/drivers/Makefile b/drivers/Makefile index 020780b..f735c49 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -72,9 +72,9 @@ obj-$(CONFIG_PARPORT) += parport/ obj-y += base/ block/ misc/ mfd/ nfc/ obj-$(CONFIG_LIBNVDIMM) += nvdimm/ obj-$(CONFIG_DAX) += dax/ -obj-$(CONFIG_CXL_BUS) += cxl/ obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf/ obj-$(CONFIG_NUBUS) += nubus/ +obj-y += cxl/ obj-y += macintosh/ obj-y += scsi/ obj-y += nvme/ diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index b88ab95..f64e398 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -98,4 +98,8 @@ config CXL_PORT default CXL_BUS tristate +config CXL_SUSPEND + def_bool y + depends on SUSPEND && CXL_MEM + endif diff --git a/drivers/cxl/Makefile b/drivers/cxl/Makefile index ce267ef..a782707 100644 --- a/drivers/cxl/Makefile +++ b/drivers/cxl/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_CXL_BUS) += core/ +obj-y += core/ obj-$(CONFIG_CXL_PCI) += cxl_pci.o obj-$(CONFIG_CXL_MEM) += cxl_mem.o obj-$(CONFIG_CXL_ACPI) += cxl_acpi.o diff --git a/drivers/cxl/core/Makefile b/drivers/cxl/core/Makefile index 6d37cd7..9d35085 100644 --- a/drivers/cxl/core/Makefile +++ b/drivers/cxl/core/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_CXL_BUS) += cxl_core.o +obj-$(CONFIG_CXL_SUSPEND) += suspend.o ccflags-y += -I$(srctree)/drivers/cxl cxl_core-y := port.o diff --git a/drivers/cxl/core/suspend.c b/drivers/cxl/core/suspend.c new file mode 100644 index 0000000..a5984d9 --- /dev/null +++ b/drivers/cxl/core/suspend.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2022 Intel Corporation. All rights reserved. */ +#include +#include +#include "cxlmem.h" + +static atomic_t mem_active; + +bool cxl_mem_active(void) +{ + return atomic_read(&mem_active) != 0; +} + +void cxl_mem_active_inc(void) +{ + atomic_inc(&mem_active); +} +EXPORT_SYMBOL_NS_GPL(cxl_mem_active_inc, CXL); + +void cxl_mem_active_dec(void) +{ + atomic_dec(&mem_active); +} +EXPORT_SYMBOL_NS_GPL(cxl_mem_active_dec, CXL); diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 243dd86..7235d2f 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -353,6 +353,17 @@ int cxl_mem_create_range_info(struct cxl_dev_state *cxlds); struct cxl_dev_state *cxl_dev_state_create(struct device *dev); void set_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds); void clear_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds); +#ifdef CONFIG_CXL_SUSPEND +void cxl_mem_active_inc(void); +void cxl_mem_active_dec(void); +#else +static inline void cxl_mem_active_inc(void) +{ +} +static inline void cxl_mem_active_dec(void) +{ +} +#endif struct cxl_hdm { struct cxl_component_regs regs; diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 43e73d2..1bd2e0b 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -138,6 +138,11 @@ out: return retval; } +static void enable_suspend(void *data) +{ + cxl_mem_active_dec(); +} + static int cxl_mem_probe(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); @@ -194,7 +199,22 @@ static int cxl_mem_probe(struct device *dev) out: cxl_device_unlock(&parent_port->dev); put_device(&parent_port->dev); - return rc; + + /* + * The kernel may be operating out of CXL memory on this device, + * there is no spec defined way to determine whether this device + * preserves contents over suspend, and there is no simple way + * to arrange for the suspend image to avoid CXL memory which + * would setup a circular dependency between PCI resume and save + * state restoration. + * + * TODO: support suspend when all the regions this device is + * hosting are locked and covered by the system address map, + * i.e. platform firmware owns restoring the HDM configuration + * that it locked. + */ + cxl_mem_active_inc(); + return devm_add_action_or_reset(dev, enable_suspend, NULL); } static struct cxl_driver cxl_mem_driver = { diff --git a/include/linux/pm.h b/include/linux/pm.h index e65b3ab..7911c4c 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -36,6 +36,15 @@ static inline void pm_vt_switch_unregister(struct device *dev) } #endif /* CONFIG_VT_CONSOLE_SLEEP */ +#ifdef CONFIG_CXL_SUSPEND +bool cxl_mem_active(void); +#else +static inline bool cxl_mem_active(void) +{ + return false; +} +#endif + /* * Device power management */ diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 938d5c7..20a66bf 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -83,7 +83,7 @@ bool hibernation_available(void) { return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION) && - !secretmem_active(); + !secretmem_active() && !cxl_mem_active(); } /** diff --git a/kernel/power/main.c b/kernel/power/main.c index 7e64607..3e6be1c 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -127,7 +127,9 @@ static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, char *s = buf; suspend_state_t i; - for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) + for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) { + if (i >= PM_SUSPEND_MEM && cxl_mem_active()) + continue; if (mem_sleep_states[i]) { const char *label = mem_sleep_states[i]; @@ -136,6 +138,7 @@ static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, else s += sprintf(s, "%s ", label); } + } /* Convert the last space to a newline if needed. */ if (s != buf) diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 6fcdee7..8270759 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -236,7 +236,8 @@ EXPORT_SYMBOL_GPL(suspend_valid_only_mem); static bool sleep_state_supported(suspend_state_t state) { - return state == PM_SUSPEND_TO_IDLE || valid_state(state); + return state == PM_SUSPEND_TO_IDLE || + (valid_state(state) && !cxl_mem_active()); } static int platform_suspend_prepare(suspend_state_t state) -- 2.7.4