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56368029d9
Add full support for negotiating _OSC as defined in the CXL 2.0 spec, as applicable to CXL-enabled platforms. Advertise support for the CXL features we support - 'CXL 2.0 port/device register access', 'Protocol Error Reporting', and 'CXL Native Hot Plug'. Request control for 'CXL Memory Error Reporting'. The requests are dependent on CONFIG_* based prerequisites, and prior PCI enabling, similar to how the standard PCI _OSC bits are determined. The CXL specification does not define any additional constraints on the hotplug flow beyond PCIe native hotplug, so a kernel that supports native PCIe hotplug, supports CXL hotplug. For error handling protocol and link errors just use PCIe AER. There is nascent support for amending AER events with CXL specific status [1], but there's otherwise no additional OS responsibility for CXL errors beyond PCIe AER. CXL Memory Errors behave the same as typical memory errors so CONFIG_MEMORY_FAILURE is sufficient to indicate support to platform firmware. [1]: https://lore.kernel.org/linux-cxl/164740402242.3912056.8303625392871313860.stgit@dwillia2-desk3.amr.corp.intel.com/ Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Robert Moore <robert.moore@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Link: https://lore.kernel.org/r/20220413073618.291335-4-vishal.l.verma@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> |
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.. | ||
platform | ||
acbuffer.h | ||
acconfig.h | ||
acexcep.h | ||
acnames.h | ||
acoutput.h | ||
acpi_bus.h | ||
acpi_drivers.h | ||
acpi_io.h | ||
acpi_lpat.h | ||
acpi_numa.h | ||
acpi.h | ||
acpiosxf.h | ||
acpixf.h | ||
acrestyp.h | ||
actbl1.h | ||
actbl2.h | ||
actbl3.h | ||
actbl.h | ||
actypes.h | ||
acuuid.h | ||
apei.h | ||
battery.h | ||
button.h | ||
cppc_acpi.h | ||
ghes.h | ||
hed.h | ||
nfit.h | ||
pcc.h | ||
pdc_intel.h | ||
processor.h | ||
reboot.h | ||
video.h |