Linus Torvalds 825d150875 cxl for 5.12 ... Introduce an initial driver for CXL 2.0 Type-3 Memory Devices. CXL is Compute Express Link which released the 2.0 specification in November. The Linux relevant changes in CXL 2.0 are support for an OS to dynamically assign address space to memory devices, support for switches, persistent memory, and hotplug. A Type-3 Memory Device is a PCI enumerated device presenting the CXL Memory Device Class Code and implementing the CXL.mem protocol. CXL.mem allows device to advertise CPU and I/O coherent memory to the system, i.e. typical "System RAM" and "Persistent Memory" in Linux /proc/iomem terms. In addition to the CXL.mem fast path there is an administrative command hardware mailbox interface for maintenance and provisioning. It is this command interface that is the focus of the initial driver. With this driver a CXL device that is mapped by the BIOS can be administered by Linux. Linux support for CXL PMEM and dynamic CXL address space management are to be implemented post v5.12. 4cdadfd5e0 cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 8adaf747c9 cxl/mem: Find device capabilities Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> b39cb1052a cxl/mem: Register CXL memX devices Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 13237183c7 cxl/mem: Add a "RAW" send command Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 472b1ce6e9 cxl/mem: Enable commands via CEL Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 57ee605b97 cxl/mem: Add set of informational commands Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEf41QbsdZzFdA8EfZHtKRamZ9iAIFAmA1xV0ACgkQHtKRamZ9 iALEMQ/8Ce45LCh0oWh8FsSZ50i1KRwKGwpYNCiutTYLBArpBZXJdE1ZRFFCKgi9 ahMs29KSsj/60vG/DYuOwZBKClUiqOQHmtCRUQbb5wGxb7q8f2AKQSPOJ+Nn0nJE kgstMnkqe/neAlNDeMRdZcoBku2++hWjVVnz8QqE5Py3v3T+uEU5Au3fIhnCyvk5 usXcH8Y6R7Lb3BxT4z3DKumaRfoxIsQlH5XFbnUbgwlkE7KHoyAagZluJqh3cZpo sZrCpwG5Onw8rKqfLl//CZ8FfBjE2XfSqJkEPCCMfZUhI78sGGdmHL3ElM9/MNIB neGs3dQ5lkTaiw0nCqFtZMvDZEUsIgXPLiBByG22TM3/aIMmLqbJzeYG6UHENwC+ hLZDV/WJNLRfeUVppt+6PgcOgjTUjNV45SdVryf10Kh3NPZh7m6OPeqG/QTKHMv9 EgbFGihZF3NcSwvf5mdQNIMlnEL0WxOl/I+bSszYPXP6l38btegHR75gUXu7UGwl 9LQhkVEQL8UmfRKX2HaG6h8hyTUOf1kQiXgvchLxYLKHXSc0J/wAwCa0w3jw1m5r bdcVQx3JcBv2S1tUHp+wMqHDbLSGpeE5nF3emWabttsjSUmlb1LuAQxgrdyBtQi9 o5v6dDLOTmAH4sAt96HWKDzpUIMix3YmO3YSghYtNrwWUylQLuA= =3SAQ -----END PGP SIGNATURE----- Merge tag 'cxl-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm Pull initial support for CXL (Compute Express Link) from Dan Williams: "Introduce an initial driver for CXL 2.0 Type-3 Memory Devices. CXL is Compute Express Link which released the 2.0 specification in November. The Linux relevant changes in CXL 2.0 are support for an OS to dynamically assign address space to memory devices, support for switches, persistent memory, and hotplug. A Type-3 Memory Device is a PCI enumerated device presenting the CXL Memory Device Class Code and implementing the CXL.mem protocol. CXL.mem allows device to advertise CPU and I/O coherent memory to the system, i.e. typical "System RAM" and "Persistent Memory" in Linux /proc/iomem terms. In addition to the CXL.mem fast path there is an administrative command hardware mailbox interface for maintenance and provisioning. It is this command interface that is the focus of the initial driver. With this driver a CXL device that is mapped by the BIOS can be administered by Linux. Linux support for CXL PMEM and dynamic CXL address space management are to be implemented post v5.12" Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 4cdadfd5e0 ("cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints") 13237183c7 ("cxl/mem: Add a "RAW" send command") 472b1ce6e9 ("cxl/mem: Enable commands via CEL") 57ee605b97 ("cxl/mem: Add set of informational commands") Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 8adaf747c9 ("cxl/mem: Find device capabilities") b39cb1052a ("cxl/mem: Register CXL memX devices") * tag 'cxl-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: cxl/mem: Fix potential memory leak cxl/mem: Return -EFAULT if copy_to_user() fails MAINTAINERS: Add maintainers of the CXL driver cxl/mem: Add set of informational commands cxl/mem: Enable commands via CEL cxl/mem: Add a "RAW" send command cxl/mem: Add basic IOCTL interface cxl/mem: Register CXL memX devices cxl/mem: Find device capabilities cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints		2021-02-24 09:38:36 -08:00
..
cdrom.rst
hdio.rst	Documentation/hdio: fix up obscure bd_contains references	2020-09-25 08:18:57 -06:00
index.rst
ioctl-decoding.rst
ioctl-number.rst	cxl for 5.12	2021-02-24 09:38:36 -08:00