Dave Jiang 21becdf8bf cxl: Add post-reset warning if reset results in loss of previously committed HDM decoders ... [ Upstream commit 934edcd436 ] Secondary Bus Reset (SBR) is equivalent to a device being hot removed and inserted again. Doing a SBR on a CXL type 3 device is problematic if the exported device memory is part of system memory that cannot be offlined. The event is equivalent to violently ripping out that range of memory from the kernel. While the hardware requires the "Unmask SBR" bit set in the Port Control Extensions register and the kernel currently does not unmask it, user can unmask this bit via setpci or similar tool. The driver does not have a way to detect whether a reset coming from the PCI subsystem is a Function Level Reset (FLR) or SBR. The only way to detect is to note if a decoder is marked as enabled in software but the decoder control register indicates it's not committed. Add a helper function to find discrepancy between the decoder software state versus the hardware register state. Suggested-by: Dan Williams <dan.j.williams@intel.com> Link: https://lore.kernel.org/r/20240502165851.1948523-6-dave.jiang@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-06-27 13:52:18 +02:00
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core	cxl: Add post-reset warning if reset results in loss of previously committed HDM decoders	2024-06-27 13:52:18 +02:00
acpi.c	cxl: Consolidate dport access_coordinate ->hb_coord and ->sw_coord into ->coord	2024-04-08 08:25:21 -07:00
cxl.h	cxl: Add post-reset warning if reset results in loss of previously committed HDM decoders	2024-06-27 13:52:18 +02:00
cxlmem.h	cxl: Consolidate dport access_coordinate ->hb_coord and ->sw_coord into ->coord	2024-04-08 08:25:21 -07:00
cxlpci.h	cxl/pci: Get rid of pointer arithmetic reading CDAT table	2024-03-12 23:52:29 -07:00
Kconfig	cxl: remove CONFIG_CXL_PMU entry in drivers/cxl/Kconfig	2024-03-27 01:58:34 +09:00
Makefile	cxl/pmem: Introduce nvdimm_security_ops with ->get_flags() operation	2022-11-30 16:30:47 -08:00
mem.c	cxl: Fix sysfs export of qos_class for memdev	2024-02-16 23:20:34 -08:00
pci.c	cxl: Add post-reset warning if reset results in loss of previously committed HDM decoders	2024-06-27 13:52:18 +02:00
pmem.c	cxl/mbox: Move mailbox related driver state to its own data structure	2023-06-25 14:31:08 -07:00
pmu.h	cxl/pci: Find and register CXL PMU devices	2023-05-30 11:20:35 -07:00
port.c	cxl: Refactor to use __free() for cxl_root allocation in cxl_endpoint_port_probe()	2024-01-05 14:36:29 -08:00
security.c	Merge branch 'for-6.5/cxl-type-2' into for-6.5/cxl	2023-06-25 17:16:51 -07:00