Linux has a look-up table for mapping BDFNs to PEs which is updated when we call into OPAL to update the PHB's internally BDFN<->PE mapping. We can use this table to the PE for a device without needing to use the cached value inside the pci_dn.
We'd like to get rid of pci_dn eventually so this patch adds adds a helper to find the ioda_pe of a BDFN based on the table. This is different to the existing helper which takes a pci_dev directly because there are some contexts (e.g. EEH recovery) where we need to check for an existing PE assignment when no corresponding pci_dev exists. Signed-off-by: Oliver O'Halloran <ooh...@gmail.com> --- arch/powerpc/platforms/powernv/pci-ioda.c | 10 ++++++++++ arch/powerpc/platforms/powernv/pci.h | 1 + 2 files changed, 11 insertions(+) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index fdacf98555e9..65b5b121ebad 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -660,6 +660,16 @@ static int pnv_ioda_get_pe_state(struct pnv_phb *phb, int pe_no) return state; } +struct pnv_ioda_pe *__pnv_ioda_get_pe(struct pnv_phb *phb, u16 bdfn) +{ + int pe_number = phb->ioda.pe_rmap[bdfn]; + + if (pe_number == IODA_INVALID_PE) + return NULL; + + return &phb->ioda.pe_array[pe_number]; +} + struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev) { struct pci_controller *hose = pci_bus_to_host(dev->bus); diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h index f914f0b14e4e..01a01739c03e 100644 --- a/arch/powerpc/platforms/powernv/pci.h +++ b/arch/powerpc/platforms/powernv/pci.h @@ -193,6 +193,7 @@ extern void pnv_pci_dma_dev_setup(struct pci_dev *pdev); extern void pnv_pci_dma_bus_setup(struct pci_bus *bus); extern int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type); extern void pnv_teardown_msi_irqs(struct pci_dev *pdev); +extern struct pnv_ioda_pe *__pnv_ioda_get_pe(struct pnv_phb *phb, u16 bdfn); extern struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev); extern void pnv_set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq); extern unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift, -- 2.21.0