Commit 021b7e42 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Dave Jiang
Browse files

cxl/pci: Introduce cxl_gpf_get_dvsec() 



Add a helper to fetch the port/device GPF dvsecs. This is
currently only used for ports, but a later patch to export
dirty count to users will make use of the device one.

Signed-off-by: default avatarDavidlohr Bueso <dave@stgolabs.net>
Reviewed-by: default avatarLi Ming <ming.li@zohomail.com>
Reviewed-by: default avatarDave Jiang <dave.jiang@intel.com>
Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://patch.msgid.link/20250220220235.276831-2-dave@stgolabs.net


Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
parent a52b6a2c

drivers/cxl/core/pci.c

+20 −10
Original line number Diff line number Diff line
@@ -1072,6 +1072,22 @@ int cxl_pci_get_bandwidth(struct pci_dev *pdev, struct access_coordinate *c) 
#define GPF_TIMEOUT_BASE_MAX 2

#define GPF_TIMEOUT_SCALE_MAX 7 /* 10 seconds */



u16 cxl_gpf_get_dvsec(struct device *dev, bool is_port)

{

	u16 dvsec;



	if (!dev_is_pci(dev))

		return 0;



	dvsec = pci_find_dvsec_capability(to_pci_dev(dev), PCI_VENDOR_ID_CXL,

			is_port ? CXL_DVSEC_PORT_GPF : CXL_DVSEC_DEVICE_GPF);

	if (!dvsec)

		dev_warn(dev, "%s GPF DVSEC not present\n",

			 is_port ? "Port" : "Device");

	return dvsec;

}

EXPORT_SYMBOL_NS_GPL(cxl_gpf_get_dvsec, "CXL");



static int update_gpf_port_dvsec(struct pci_dev *pdev, int dvsec, int phase)

{

	u64 base, scale;
@@ -1116,26 +1132,20 @@ int cxl_gpf_port_setup(struct device *dport_dev, struct cxl_port *port) 
{

	struct pci_dev *pdev;



	if (!dev_is_pci(dport_dev))

		return 0;



	pdev = to_pci_dev(dport_dev);

	if (!pdev || !port)

	if (!port)

		return -EINVAL;



	if (!port->gpf_dvsec) {

		int dvsec;



		dvsec = pci_find_dvsec_capability(pdev, PCI_VENDOR_ID_CXL,

						  CXL_DVSEC_PORT_GPF);

		if (!dvsec) {

			pci_warn(pdev, "Port GPF DVSEC not present\n");

		dvsec = cxl_gpf_get_dvsec(dport_dev, true);

		if (!dvsec)

			return -EINVAL;

		}



		port->gpf_dvsec = dvsec;

	}



	pdev = to_pci_dev(dport_dev);

	update_gpf_port_dvsec(pdev, port->gpf_dvsec, 1);

	update_gpf_port_dvsec(pdev, port->gpf_dvsec, 2);

drivers/cxl/cxl.h

+2 −0
Original line number Diff line number Diff line
@@ -922,4 +922,6 @@ bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port); 
#define __mock static

#endif



u16 cxl_gpf_get_dvsec(struct device *dev, bool is_port);



#endif /* __CXL_H__ */