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cxl/hdm: Create emulated cxl_hdm for devices that do not have HDM decoders

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CXL rev3 spec 8.1.3

RCDs may not have HDM register blocks. Create a fake HDM with information
from the CXL PCIe DVSEC registers. The decoder count will be set to the
HDM count retrieved from the DVSEC cap register.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/167640368994.935665.15831225724059704620.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang
2023-02-14 11:41:30 -08:00
committed by Dan Williams
parent b777e9bec9
commit 4474ce565e
7 changed files with 66 additions and 20 deletions
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3
tools/testing/cxl/test/cxl.c
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@@ -618,7 +618,8 @@ static struct acpi_pci_root *mock_acpi_pci_find_root(acpi_handle handle)
return &mock_pci_root[host_bridge_index(adev)];
}
static struct cxl_hdm *mock_cxl_setup_hdm(struct cxl_port *port)
static struct cxl_hdm *mock_cxl_setup_hdm(struct cxl_port *port,
struct cxl_endpoint_dvsec_info *info)
{
struct cxl_hdm *cxlhdm = devm_kzalloc(&port->dev, sizeof(*cxlhdm), GFP_KERNEL);