| Message ID | 166931494367.2104015.9411254827419714457.stgit@dwillia2-xfh.jf.intel.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | cxl: Add support for Restricted CXL hosts (RCD mode) | expand |
On 24.11.22 10:35:43, Dan Williams wrote: > From: Terry Bowman <terry.bowman@amd.com> > > ACPI includes a CXL _OSC for the OS to communicate what it knows of CXL > device topologies. To date Linux has added support for CXL 2.0 (VH) port > topologies, hotplug, and error handling. Now that the driver also know > how to enumerate CXL 1.1 (RCH) port topologies, indicate that capability > via CXL _OSC. See CXL3.0 Table 9-26 'Interpretation of CXL _OSC Support > Field' > > Signed-off-by: Terry Bowman <terry.bowman@amd.com> > Signed-off-by: Robert Richter <rrichter@amd.com> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > [djbw: wordsmith changelog] > Signed-off-by: Dan Williams <dan.j.williams@intel.com> I have had a reworded version of this in the pipe too, esp. version strings were dropped in favor of VH and RCD mode. You might want to consider that one: -- >8 -- From 260e04d5d34c6d37a1866b73a5e229d1ceddf272 Mon Sep 17 00:00:00 2001 From: Terry Bowman <terry.bowman@amd.com> Date: Mon, 14 Nov 2022 10:03:30 -0600 Subject: [PATCH v5] cxl/acpi: Set ACPI's CXL _OSC to indicate RCD mode support ACPI uses the CXL _OSC support method to communicate the available CXL functionality to FW. The CXL _OSC support method includes a field to indicate the OS is capable of RCD mode. FW can potentially change it's operation depending on the _OSC support method reported by the OS. The ACPI driver currently only sets the ACPI _OSC support method to indicate CXL VH mode. Change the capability reported to also include CXL RCD mode. [1] CXL3.0 Table 9-26 'Interpretation of CXL _OSC Support Field' Signed-off-by: Terry Bowman <terry.bowman@amd.com> [rrichter@amd.com: Reworded patch description.] Signed-off-by: Robert Richter <rrichter@amd.com> --- drivers/acpi/pci_root.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 4e3db20e9cbb..b3c202d2a433 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -493,6 +493,7 @@ static u32 calculate_cxl_support(void) u32 support; support = OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT; + support |= OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT; if (pci_aer_available()) support |= OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT; if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
Robert Richter wrote: > On 24.11.22 10:35:43, Dan Williams wrote: > > From: Terry Bowman <terry.bowman@amd.com> > > > > ACPI includes a CXL _OSC for the OS to communicate what it knows of CXL > > device topologies. To date Linux has added support for CXL 2.0 (VH) port > > topologies, hotplug, and error handling. Now that the driver also know > > how to enumerate CXL 1.1 (RCH) port topologies, indicate that capability > > via CXL _OSC. See CXL3.0 Table 9-26 'Interpretation of CXL _OSC Support > > Field' > > > > Signed-off-by: Terry Bowman <terry.bowman@amd.com> > > Signed-off-by: Robert Richter <rrichter@amd.com> > > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > [djbw: wordsmith changelog] > > Signed-off-by: Dan Williams <dan.j.williams@intel.com> > > I have had a reworded version of this in the pipe too, esp. version > strings were dropped in favor of VH and RCD mode. You might want to > consider that one: Sure, looks good to me.
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 4e3db20e9cbb..b3c202d2a433 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -493,6 +493,7 @@ static u32 calculate_cxl_support(void) u32 support; support = OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT; + support |= OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT; if (pci_aer_available()) support |= OSC_CXL_PROTOCOL_ERR_REPORTING_SUPPORT; if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))