Re: [PATCH 1/4] powerpc/powernv/pci: Add helper to find ioda_pe from BDFN

[Michael Ellerman]

On Fri, 17 Apr 2020 17:35:05 +1000, Oliver O'Halloran wrote:
> For each PHB we maintain a reverse-map that can be used to find the
> PE that a BDFN is currently mapped to. Add a helper for doing this
> lookup so we can check if a PE has been configured without looking
> at pdn->pe_number.

Applied to powerpc/next.

[1/4] powerpc/powernv/pci: Add helper to find ioda_pe from BDFN
  https://git.kernel.org/powerpc/c/a8d7d5fc2e1672924a391aa37ef8c02d1ec84a4e
[2/4] powerpc/powernv/pci: Re-work bus PE configuration
  https://git.kernel.org/powerpc/c/dc3d8f85bb571c3640ebba24b82a527cf2cb3f24
[3/4] powerpc/powernv/pci: Reserve the root bus PE during init
  https://git.kernel.org/powerpc/c/718d249aeadff058f79c2e6b25212dd45bd711ae
[4/4] powerpc/powernv/pci: Sprinkle around some WARN_ON()s
  https://git.kernel.org/powerpc/c/6ae8aedf8fa932541f48a85219d75ca041c22080

cheers

[PATCH 1/4] powerpc/powernv/pci: Add helper to find ioda_pe from BDFN

[Oliver O'Halloran]

For each PHB we maintain a reverse-map that can be used to find the
PE that a BDFN is currently mapped to. Add a helper for doing this
lookup so we can check if a PE has been configured without looking
at pdn->pe_number.

Signed-off-by: Oliver O'Halloran 
---
 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 8ae8836..934cbee 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_pci_bdfn_to_pe(struct pnv_phb *phb, u16 bdfn)
+{
+   int pe_number = phb->ioda.pe_rmap[bdfn];
+
+   if (pe_number == IODA_INVALID_PE)
+   return NULL;
+
+   return >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 fc05f9b..83d40a0 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -208,6 +208,7 @@ extern int pnv_eeh_phb_reset(struct pci_controller *hose, 
int option);
 
 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_pci_bdfn_to_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,
-- 
2.9.5