linux-next.git/drivers/cxl/core/memdev.c, branch master

Merge branch 'for-7.3/cxl-fixes' into cxl-for-next

2026-07-24T20:16:27+00:00

Various CXL fixes cxl/features: Clamp Get Feature output size to the remaining buffer cxl/features: Reject Set Features output buffer smaller than the header cxl/features: Reject Get Feature count larger than the output buffer cxl/port: Restart port enumeration when a sibling adds the dport first cxl/features: Serialize multi-part Get/Set Feature transfers cxl/pci: Honor -EPROBE_DEFER from component register setup cxl/mbox: Break poison list loop on an empty payload cxl/memdev: Fix firmware upload exact-fit handling cxl/features: bound fwctl command payload to the input buffer cxl/mce: Make the MCE notifier per-region cxl/pci: Remove incorrect mbox.valid check in cxl_pci_type3_init_mailbox() cxl: docs/linux/dax-driver - fix typos cxl: fix mailbox return code description typo cxl/mbox: Clamp mailbox output allocation to the payload size

cxl/memdev: Fix firmware upload exact-fit handling

2026-07-14T15:55:26+00:00

cxl_fw_prepare() classifies a firmware image as a one-shot transfer only when its Transfer FW input payload is smaller than the mailbox payload size. An image that exactly fills the payload is therefore treated as a multi-part transfer. The firmware loader invokes cxl_fw_write() only once for that image. Since both offset == 0 and remaining == 0, the multi-part action selection sends INITIATE, never sends END, and then attempts to activate the target slot. Include equality in the one-shot classification so exact-fit images use the FULL action. Fixes: 9521875bbe00 ("cxl: add a firmware update mechanism using the sysfs firmware loader") Signed-off-by: Guzebing Reviewed-by: Dave Jiang Link: https://patch.msgid.link/20260713112744.2543829-1-guzebing1612@gmail.com Signed-off-by: Dave Jiang

cxl: Support dpa without a mailbox

2026-06-29T17:55:47+00:00

Type3 relies on mailbox CXL_MBOX_OP_IDENTIFY command for initializing memdev state params which end up being used for DPA initialization. Allow a Type2 driver to initialize DPA simply by giving the size of its volatile hardware partition. Move related functions to memdev. Signed-off-by: Alejandro Lucero Reviewed-by: Dan Williams Reviewed-by: Dave Jiang Reviewed-by: Ben Cheatham Reviewed-by: Jonathan Cameron Acked-by: Edward Cree Link: https://patch.msgid.link/20260629183727.51502-3-alejandro.lucero-palau@amd.com Signed-off-by: Dave Jiang

cxl/memdev: Introduce cxl_class_memdev_type

2026-06-12T20:47:29+00:00

In preparation for memdev's without mailbox related infrastructure, introduce cxl_class_memdev_type as a superset of a cxl_memdev_type. Effectively the only difference is that cxl_class_memdev_type exports common sysfs attributes where cxl_memdev_type has none. Related to this is all the cxl_mem_probe() paths that assume the presence of a class device mailbox are updated to skip that requirement. Co-developed-by: Alejandro Lucero Signed-off-by: Alejandro Lucero Signed-off-by: Dan Williams Tested-by: ALejandro Lucero Reviewed-by: Dave Jiang Link: https://patch.msgid.link/20260519210158.1499795-5-djbw@kernel.org Signed-off-by: Dave Jiang

cxl/memdev: Pin parents for entire memdev lifetime

2026-06-12T20:47:29+00:00

In order to be able to manage the driver that uses a memdev attach mechanism the parent needs to stick around for the device_release_driver(cxlmd->dev.parent) event. Fixes: 29317f8dc6ed ("cxl/mem: Introduce cxl_memdev_attach for CXL-dependent operation") Signed-off-by: Dan Williams Reviewed-by: Alejandro Lucero Tested-by: ALejandro Lucero Reviewed-by: Dave Jiang Link: https://patch.msgid.link/20260519210158.1499795-4-djbw@kernel.org Signed-off-by: Dave Jiang

Merge branch 'for-7.1/cxl-type2-support' into cxl-for-next

2026-04-03T19:18:23+00:00

Prep patches for CXL type2 accelerator basic support cxl/region: Factor out interleave granularity setup cxl/region: Factor out interleave ways setup cxl: Make region type based on endpoint type cxl/pci: Remove redundant cxl_pci_find_port() call cxl: Move pci generic code from cxl_pci to core/cxl_pci cxl: export internal structs for external Type2 drivers cxl: support Type2 when initializing cxl_dev_state

cxl/core: Check existence of cxl_memdev_state in poison test

2026-03-31T22:18:06+00:00

Before now, all CXL memdevs were assumed to have a mailbox-backed cxl_memdev_state, so poison command checks could safely dereference the @mds. With the introduction of Type 2 devices, a memdev may not implement a mailbox interface, and so there is no associated cxl_memdev_state. Guard against this case by returning false when @mds is absent. Signed-off-by: Alison Schofield Reviewed-by: Alejandro Lucero Link: https://patch.msgid.link/20260331005047.2813980-1-alison.schofield@intel.com Signed-off-by: Dave Jiang

cxl: support Type2 when initializing cxl_dev_state

2026-03-16T23:24:29+00:00

In preparation for type2 drivers add function and macro for differentiating CXL memory expanders (type 3) from CXL device accelerators (type 2) helping drivers built from public headers to embed struct cxl_dev_state inside a private struct. Update type3 driver for using this same initialization. Signed-off-by: Alejandro Lucero Reviewed-by: Dave Jiang Reviewed-by: Alison Schofield Reviewed-by: Gregory Price Reviewed-by: Jonathan Cameron Link: https://patch.msgid.link/20260306164741.3796372-2-alejandro.lucero-palau@amd.com Signed-off-by: Dave Jiang

cxl/memdev: fix deadlock in cxl_memdev_autoremove() on attach failure

2026-02-23T16:03:44+00:00

cxl_memdev_autoremove() takes device_lock(&cxlmd->dev) via guard(device) and then calls cxl_memdev_unregister() when the attach callback was provided but cxl_mem_probe() failed to bind. cxl_memdev_unregister() calls cdev_device_del() device_del() bus_remove_device() device_release_driver() This path is reached when a driver uses the @attach parameter to devm_cxl_add_memdev() and the CXL topology fails to enumerate (e.g. DVSEC range registers decode outside platform-defined CXL ranges, causing the endpoint port probe to fail). Add cxl_memdev_attach_failed() to set the scope of the check correctly. Reported-by: kreview-c94b85d6d2 Fixes: 29317f8dc6ed ("cxl/mem: Introduce cxl_memdev_attach for CXL-dependent operation") Signed-off-by: Gregory Price Reviewed-by: Dan Williams Reviewed-by: Davidlohr Bueso Link: https://patch.msgid.link/20260211192228.2148713-1-gourry@gourry.net Signed-off-by: Dave Jiang

Convert 'alloc_flex' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This is the exact same thing as the 'alloc_obj()' version, only much smaller because there are a lot fewer users of the *alloc_flex() interface. As with alloc_obj() version, this was done entirely with mindless brute force, using the same script, except using 'flex' in the pattern rather than 'objs*'. Signed-off-by: Linus Torvalds