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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 18:07:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 18:07:03 -0700
commitb9132c32e01976686efa26252cc246944a0d2cab (patch)
treefe93979a569002f6f9a4188b1f21d475bbdec82b /lib
parentb14ffae378aa1db993e62b01392e70d1e585fb23 (diff)
parent05e815539f3f161585c13a9ab023341bade2c52f (diff)
Merge tag 'cxl-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
Pull CXL (Compute Express Link) updates from Dan Williams: "This development cycle extends the subsystem to discover CXL resources throughout a CXL/PCIe switch topology and respond to hot add/remove events anywhere in that topology. This is more foundational infrastructure in preparation for dynamic memory region provisioning support. Recall that CXL memory regions, as the new "Theory of Operation" section of Documentation/driver-api/cxl/memory-devices.rst describes, bring storage volume striping semantics to memory. The hot add/remove behavior is validated with extensions to the cxl_test unit test environment and this test in the cxl-cli test suite: https://github.com/pmem/ndctl/blob/djbw/for-74/cxl/test/cxl-topology.sh Summary: - Add a driver for 'struct cxl_memdev' objects responsible for CXL.mem operation as distinct from 'cxl_pci' mailbox operations. Its primary responsibility is enumerating an endpoint 'struct cxl_port' and all the 'struct cxl_port' instances between an endpoint and the CXL platform root. - Add a driver for 'struct cxl_port' objects responsible for enumerating and operating all Host-managed Device Memory (HDM) decoder resources between the platform-level CXL memory description, all intervening host bridges / switches, and the HDM resources in endpoints. - Update the cxl_pci driver to validate CXL.mem operation precursors to HDM decoder operation like ready-polling, and legacy CXL 1.1 DVSEC based CXL.mem configuration. - Add basic lockdep coverage for usage of device_lock() on CXL subsystem objects similar to what exists for LIBNVDIMM. Include a compile-time switch for which subsystem to validate at run-time. - Update cxl_test to emulate a one level switch topology. - Document a "Theory of Operation" for the subsystem. - Add 'numa_node' and 'serial' attributes to cxl_memdev sysfs - Include miscellaneous fixes for spec / QEMU CXL emulation compatibility and static analysis reports" * tag 'cxl-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (48 commits) cxl/core/port: Fix NULL but dereferenced coccicheck error cxl/port: Hold port reference until decoder release cxl/port: Fix endpoint refcount leak cxl/core: Fix cxl_device_lock() class detection cxl/core/port: Fix unregister_port() lock assertion cxl/regs: Fix size of CXL Capability Header Register cxl/core/port: Handle invalid decoders cxl/core/port: Fix / relax decoder target enumeration tools/testing/cxl: Add a physical_node link tools/testing/cxl: Enumerate mock decoders tools/testing/cxl: Mock one level of switches tools/testing/cxl: Fix root port to host bridge assignment tools/testing/cxl: Mock dvsec_ranges() cxl/core/port: Add endpoint decoders cxl/core: Move target_list out of base decoder attributes cxl/mem: Add the cxl_mem driver cxl/core/port: Add switch port enumeration cxl/memdev: Add numa_node attribute cxl/pci: Emit device serial number cxl/pci: Implement wait for media active ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug23
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cfe3b092c31d..075cd25363ac 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1544,6 +1544,29 @@ config CSD_LOCK_WAIT_DEBUG
include the IPI handler function currently executing (if any)
and relevant stack traces.
+choice
+ prompt "Lock debugging: prove subsystem device_lock() correctness"
+ depends on PROVE_LOCKING
+ help
+ For subsystems that have instrumented their usage of the device_lock()
+ with nested annotations, enable lock dependency checking. The locking
+ hierarchy 'subclass' identifiers are not compatible across
+ sub-systems, so only one can be enabled at a time.
+
+config PROVE_NVDIMM_LOCKING
+ bool "NVDIMM"
+ depends on LIBNVDIMM
+ help
+ Enable lockdep to validate nd_device_lock() usage.
+
+config PROVE_CXL_LOCKING
+ bool "CXL"
+ depends on CXL_BUS
+ help
+ Enable lockdep to validate cxl_device_lock() usage.
+
+endchoice
+
endmenu # lock debugging
config TRACE_IRQFLAGS