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powerpc/powernv: Introduce pnv_pci_get_slot_id()

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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: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan 2016-05-20 16:41:40 +10:00 committed by Michael Ellerman
parent 9c0e1ecbe1
commit 7e19bf32c8
2 changed files with 40 additions and 0 deletions
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2
arch/powerpc/include/asm/pnv-pci.h
View File

@ -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);

38
arch/powerpc/platforms/powernv/pci.c
View File

@ -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)
{