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    Merge tag 'cxl-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · 825d1508
    Linus Torvalds 提交于
    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: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      4cdadfd5 ("cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints")
      13237183 ("cxl/mem: Add a "RAW" send command")
      472b1ce6 ("cxl/mem: Enable commands via CEL")
      57ee605b ("cxl/mem: Add set of informational commands")
    Reviewed-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
      8adaf747 ("cxl/mem: Find device capabilities")
      b39cb105 ("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
    825d1508
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