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cxl: Add support for reading CXL switch CDAT table

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Add read_cdat_data() call in cxl_switch_port_probe() to allow
reading of CDAT data for CXL switches. read_cdat_data() needs
to be adjusted for the retrieving of the PCIe device depending
on if the passed in port is endpoint or switch.

Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/169713682855.2205276.6418370379144967443.stgit@djiang5-mobl3
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2023-10-12 11:53:48 -07:00 committed by Dan Williams
parent 670e4e88f3
commit 8358e8f159
2 changed files with 20 additions and 5 deletions
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22
drivers/cxl/core/pci.c
View File

@ -613,18 +613,30 @@ static unsigned char cdat_checksum(void *buf, size_t size)
*/
void read_cdat_data(struct cxl_port *port)
{
struct cxl_memdev *cxlmd = to_cxl_memdev(port->uport_dev);
struct device *host = cxlmd->dev.parent;
struct device *uport = port->uport_dev;
struct device *dev = &port->dev;
struct pci_doe_mb *cdat_doe;
struct pci_dev *pdev = NULL;
struct cxl_memdev *cxlmd;
size_t cdat_length;
void *cdat_table;
int rc;
if (!dev_is_pci(host))
if (is_cxl_memdev(uport)) {
struct device *host;
cxlmd = to_cxl_memdev(uport);
host = cxlmd->dev.parent;
if (dev_is_pci(host))
pdev = to_pci_dev(host);
} else if (dev_is_pci(uport)) {
pdev = to_pci_dev(uport);
}
if (!pdev)
return;
cdat_doe = pci_find_doe_mailbox(to_pci_dev(host),
PCI_DVSEC_VENDOR_ID_CXL,
cdat_doe = pci_find_doe_mailbox(pdev, PCI_DVSEC_VENDOR_ID_CXL,
CXL_DOE_PROTOCOL_TABLE_ACCESS);
if (!cdat_doe) {
dev_dbg(dev, "No CDAT mailbox\n");

3
drivers/cxl/port.c
View File

@ -62,6 +62,9 @@ static int cxl_switch_port_probe(struct cxl_port *port)
struct cxl_hdm *cxlhdm;
int rc;
/* Cache the data early to ensure is_visible() works */
read_cdat_data(port);
rc = devm_cxl_port_enumerate_dports(port);
if (rc < 0)
return rc;