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authorDan Williams <dan.j.williams@intel.com>2021-02-17 07:09:50 +0300
committerDan Williams <dan.j.williams@intel.com>2021-02-17 07:36:38 +0300
commit4cdadfd5e0a70017fec735b7b6d7f2f731842dc6 (patch)
tree2799c35a3a590847b517271742eccde395655e6f /include/linux/pci_ids.h
parent1048ba83fb1c00cd24172e23e8263972f6b5d9ac (diff)
downloadlinux-4cdadfd5e0a70017fec735b7b6d7f2f731842dc6.tar.xz
cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints
The CXL.mem protocol allows a device to act as a provider of "System RAM" and/or "Persistent Memory" that is fully coherent as if the memory was attached to the typical CPU memory controller. With the CXL-2.0 specification a PCI endpoint can implement a "Type-3" device interface and give the operating system control over "Host Managed Device Memory". See section 2.3 Type 3 CXL Device. The memory range exported by the device may optionally be described by the platform firmware memory map, or by infrastructure like LIBNVDIMM to provision persistent memory capacity from one, or more, CXL.mem devices. A pre-requisite for Linux-managed memory-capacity provisioning is this cxl_mem driver that can speak the mailbox protocol defined in section 8.2.8.4 Mailbox Registers. For now just land the initial driver boiler-plate and Documentation/ infrastructure. Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: David Rientjes <rientjes@google.com> (v1) Cc: Jonathan Corbet <corbet@lwn.net> Link: https://www.computeexpresslink.org/download-the-specification Link: https://lore.kernel.org/r/20210217040958.1354670-2-ben.widawsky@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/pci_ids.h')
-rw-r--r--include/linux/pci_ids.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index d8156a5dbee8..766260a9b247 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -51,6 +51,7 @@
#define PCI_BASE_CLASS_MEMORY 0x05
#define PCI_CLASS_MEMORY_RAM 0x0500
#define PCI_CLASS_MEMORY_FLASH 0x0501
+#define PCI_CLASS_MEMORY_CXL 0x0502
#define PCI_CLASS_MEMORY_OTHER 0x0580
#define PCI_BASE_CLASS_BRIDGE 0x06