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cxl: Deprecate driver

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The cxl driver is no longer actively maintained and we intend to remove it
in a future kernel release.

cxl has received minimal maintenance for several years, and is not
supported on the Power10 processor. We aren't aware of any users who are
likely to be using recent kernels.

Change its MAINTAINERS status to obsolete, update the sysfs ABI
documentation accordingly, add a warning message on device probe, change
the Kconfig options to label it as deprecated, and don't build it by
default.

Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241210054055.144813-2-ajd@linux.ibm.com
This commit is contained in:
Andrew Donnellan 2024-12-10 16:40:54 +11:00 • committed by Madhavan Srinivasan
parent 3a7a53c8d4
commit 5731d41af9
5 changed files with 13 additions and 4 deletions
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3
Documentation/ABI/testing/sysfs-class-cxl → Documentation/ABI/obsolete/sysfs-class-cxl
View file

@ -1,3 +1,6 @@
The cxl driver is no longer maintained, and will be removed from the kernel in
the near future.
Please note that attributes that are shared between devices are stored in
the directory pointed to by the symlink device/.
For example, the real path of the attribute /sys/class/cxl/afu0.0s/irqs_max is

4
MAINTAINERS
View file

@ -6228,8 +6228,8 @@ CXL (IBM Coherent Accelerator Processor Interface CAPI) DRIVER
M: Frederic Barrat <fbarrat@linux.ibm.com>
M: Andrew Donnellan <ajd@linux.ibm.com>
L: linuxppc-dev@lists.ozlabs.org
S: Supported
F: Documentation/ABI/testing/sysfs-class-cxl
S: Obsolete
F: Documentation/ABI/obsolete/sysfs-class-cxl
F: Documentation/arch/powerpc/cxl.rst
F: arch/powerpc/platforms/powernv/pci-cxl.c
F: drivers/misc/cxl/

6
drivers/misc/cxl/Kconfig
View file

@ -9,11 +9,13 @@ config CXL_BASE
select PPC_64S_HASH_MMU
config CXL
tristate "Support for IBM Coherent Accelerators (CXL)"
tristate "Support for IBM Coherent Accelerators (CXL) (DEPRECATED)"
depends on PPC_POWERNV && PCI_MSI && EEH
select CXL_BASE
default m
help
The cxl driver is deprecated and will be removed in a future
kernel release.
Select this option to enable driver support for IBM Coherent
Accelerators (CXL). CXL is otherwise known as Coherent Accelerator
Processor Interface (CAPI). CAPI allows accelerators in FPGAs to be

2
drivers/misc/cxl/of.c
View file

@ -295,6 +295,8 @@ int cxl_of_probe(struct platform_device *pdev)
int ret;
int slice = 0, slice_ok = 0;
dev_err_once(&pdev->dev, "DEPRECATION: cxl is deprecated and will be removed in a future kernel release\n");
pr_devel("in %s\n", __func__);
np = pdev->dev.of_node;

2
drivers/misc/cxl/pci.c
View file

@ -1726,6 +1726,8 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
int slice;
int rc;
dev_err_once(&dev->dev, "DEPRECATED: cxl is deprecated and will be removed in a future kernel release\n");
if (cxl_pci_is_vphb_device(dev)) {
dev_dbg(&dev->dev, "cxl_init_adapter: Ignoring cxl vphb device\n");
return -ENODEV;