Commit af113553 authored by Sean V Kelley's avatar Sean V Kelley Committed by Bjorn Helgaas
Browse files

PCI/AER: Add pcie_walk_rcec() to RCEC AER handling 



Root Complex Event Collectors (RCEC) appear as peers to Root Ports and also
have the AER capability. In addition, actions need to be taken for
associated RCiEPs. In such cases the RCECs will need to be walked in order
to find and act upon their respective RCiEPs.

Extend the existing ability to link the RCECs with a walking function
pcie_walk_rcec(). Add RCEC support to the current AER service driver and
attach the AER service driver to the RCEC device.

Co-developed-by: default avatarQiuxu Zhuo <qiuxu.zhuo@intel.com>
Link: https://lore.kernel.org/r/20201121001036.8560-14-sean.v.kelley@intel.com


Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # non-native/no RCEC
Signed-off-by: default avatarQiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: default avatarSean V Kelley <sean.v.kelley@intel.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarKuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
parent 57908622

drivers/pci/pci.h

+6 −0
Original line number Diff line number Diff line
@@ -473,10 +473,16 @@ static inline void pci_dpc_init(struct pci_dev *pdev) {} 
void pci_rcec_init(struct pci_dev *dev);

void pci_rcec_exit(struct pci_dev *dev);

void pcie_link_rcec(struct pci_dev *rcec);

void pcie_walk_rcec(struct pci_dev *rcec,

		    int (*cb)(struct pci_dev *, void *),

		    void *userdata);

#else

static inline void pci_rcec_init(struct pci_dev *dev) {}

static inline void pci_rcec_exit(struct pci_dev *dev) {}

static inline void pcie_link_rcec(struct pci_dev *rcec) {}

static inline void pcie_walk_rcec(struct pci_dev *rcec,

				  int (*cb)(struct pci_dev *, void *),

				  void *userdata) {}

#endif



#ifdef CONFIG_PCI_ATS

drivers/pci/pcie/aer.c

+11 −4
Original line number Diff line number Diff line
@@ -918,6 +918,9 @@ static bool find_source_device(struct pci_dev *parent, 
	if (result)

		return true;



	if (pci_pcie_type(parent) == PCI_EXP_TYPE_RC_EC)

		pcie_walk_rcec(parent, find_device_iter, e_info);

	else

		pci_walk_bus(parent->subordinate, find_device_iter, e_info);



	if (!e_info->error_dev_num) {
@@ -1056,6 +1059,7 @@ int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) 
		if (!(info->status & ~info->mask))

			return 0;

	} else if (type == PCI_EXP_TYPE_ROOT_PORT ||

		   type == PCI_EXP_TYPE_RC_EC ||

		   type == PCI_EXP_TYPE_DOWNSTREAM ||

		   info->severity == AER_NONFATAL) {
@@ -1233,9 +1237,12 @@ static void set_downstream_devices_error_reporting(struct pci_dev *dev, 
{

	set_device_error_reporting(dev, &enable);



	if (!dev->subordinate)

		return;

	pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);

	if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC)

		pcie_walk_rcec(dev, set_device_error_reporting, &enable);

	else if (dev->subordinate)

		pci_walk_bus(dev->subordinate, set_device_error_reporting,

			     &enable);



}



/**

drivers/pci/pcie/rcec.c

+37 −0
Original line number Diff line number Diff line
@@ -53,6 +53,18 @@ static int link_rcec_helper(struct pci_dev *dev, void *data) 
	return 0;

}



static int walk_rcec_helper(struct pci_dev *dev, void *data)

{

	struct walk_rcec_data *rcec_data = data;

	struct pci_dev *rcec = rcec_data->rcec;



	if ((pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) &&

	    rcec_assoc_rciep(rcec, dev))

		rcec_data->user_callback(dev, rcec_data->user_data);



	return 0;

}



static void walk_rcec(int (*cb)(struct pci_dev *dev, void *data),

		      void *userdata)

{
@@ -109,6 +121,31 @@ void pcie_link_rcec(struct pci_dev *rcec) 
	walk_rcec(link_rcec_helper, &rcec_data);

}



/**

 * pcie_walk_rcec - Walk RCiEP devices associating with RCEC and call callback.

 * @rcec:	RCEC whose RCiEP devices should be walked

 * @cb:		Callback to be called for each RCiEP device found

 * @userdata:	Arbitrary pointer to be passed to callback

 *

 * Walk the given RCEC. Call the callback on each RCiEP found.

 *

 * If @cb returns anything other than 0, break out.

 */

void pcie_walk_rcec(struct pci_dev *rcec, int (*cb)(struct pci_dev *, void *),

		    void *userdata)

{

	struct walk_rcec_data rcec_data;



	if (!rcec->rcec_ea)

		return;



	rcec_data.rcec = rcec;

	rcec_data.user_callback = cb;

	rcec_data.user_data = userdata;



	walk_rcec(walk_rcec_helper, &rcec_data);

}



void pci_rcec_init(struct pci_dev *dev)

{

	struct rcec_ea *rcec_ea;

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