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Commit 7e19bf32 authored by Gavin Shan's avatar Gavin Shan Committed by Michael Ellerman
Browse files

powerpc/powernv: Introduce pnv_pci_get_slot_id() 



This introduces pnv_pci_get_slot_id() to get the hotpluggable PCI
slot ID from the corresponding device node. It will be used by
hotplug driver.

Requested-by: default avatarAndrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 9c0e1ecb

arch/powerpc/include/asm/pnv-pci.h

+2 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#define PCI_SLOT_ID(phb_id, bdfn)	\

	(PCI_SLOT_ID_PREFIX | ((uint64_t)(bdfn) << 16) | (phb_id))



extern int pnv_pci_get_slot_id(struct device_node *np, uint64_t *id);



int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode);

int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,

			   unsigned int virq);

arch/powerpc/platforms/powernv/pci.c

+38 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <asm/machdep.h>

#include <asm/msi_bitmap.h>

#include <asm/ppc-pci.h>

#include <asm/pnv-pci.h>

#include <asm/opal.h>

#include <asm/iommu.h>

#include <asm/tce.h>
@@ -36,6 +37,43 @@ 
#include "powernv.h"

#include "pci.h"



int pnv_pci_get_slot_id(struct device_node *np, uint64_t *id)

{

	struct device_node *parent = np;

	u32 bdfn;

	u64 phbid;

	int ret;



	ret = of_property_read_u32(np, "reg", &bdfn);

	if (ret)

		return -ENXIO;



	bdfn = ((bdfn & 0x00ffff00) >> 8);

	while ((parent = of_get_parent(parent))) {

		if (!PCI_DN(parent)) {

			of_node_put(parent);

			break;

		}



		if (!of_device_is_compatible(parent, "ibm,ioda2-phb")) {

			of_node_put(parent);

			continue;

		}



		ret = of_property_read_u64(parent, "ibm,opal-phbid", &phbid);

		if (ret) {

			of_node_put(parent);

			return -ENXIO;

		}



		*id = PCI_SLOT_ID(phbid, bdfn);

		return 0;

	}



	return -ENODEV;

}

EXPORT_SYMBOL_GPL(pnv_pci_get_slot_id);



#ifdef CONFIG_PCI_MSI

int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)

{