linux/arch/powerpc/platforms/powernv/powernv.h
Daniel Axtens 763d2d8df1 powerpc/powernv: Move dma_set_mask() from pnv_phb to pci_controller_ops
Previously, dma_set_mask() on powernv was convoluted:
 0) Call dma_set_mask() (a/p/kernel/dma.c)
 1) In dma_set_mask(), ppc_md.dma_set_mask() exists, so call it.
 2) On powernv, that function pointer is pnv_dma_set_mask().
    In pnv_dma_set_mask(), the device is pci, so call pnv_pci_dma_set_mask().
 3) In pnv_pci_dma_set_mask(), call pnv_phb->set_dma_mask() if it exists.
 4) It only exists in the ioda case, where it points to
    pnv_pci_ioda_dma_set_mask(), which is the final function.

So the call chain is:
 dma_set_mask() ->
  pnv_dma_set_mask() ->
   pnv_pci_dma_set_mask() ->
    pnv_pci_ioda_dma_set_mask()

Both ppc_md and pnv_phb function pointers are used.

Rip out the ppc_md call, pnv_dma_set_mask() and pnv_pci_dma_set_mask().

Instead:
 0) Call dma_set_mask() (a/p/kernel/dma.c)
 1) In dma_set_mask(), the device is pci, and pci_controller_ops.dma_set_mask()
    exists, so call pci_controller_ops.dma_set_mask()
 2) In the ioda case, that points to pnv_pci_ioda_dma_set_mask().

The new call chain is
 dma_set_mask() ->
  pnv_pci_ioda_dma_set_mask()

Now only the pci_controller_ops function pointer is used.

The fallback paths for p5ioc2 are the same.

Previously, pnv_pci_dma_set_mask() would find no pnv_phb->set_dma_mask()
function, to it would call __set_dma_mask().

Now, dma_set_mask() finds no ppc_md call or pci_controller_ops call,
so it calls __set_dma_mask().

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-02 13:18:49 +10:00

36 lines
735 B
C

#ifndef _POWERNV_H
#define _POWERNV_H
#ifdef CONFIG_SMP
extern void pnv_smp_init(void);
#else
static inline void pnv_smp_init(void) { }
#endif
struct pci_dev;
#ifdef CONFIG_PCI
extern void pnv_pci_init(void);
extern void pnv_pci_shutdown(void);
extern u64 pnv_pci_dma_get_required_mask(struct pci_dev *pdev);
#else
static inline void pnv_pci_init(void) { }
static inline void pnv_pci_shutdown(void) { }
static inline u64 pnv_pci_dma_get_required_mask(struct pci_dev *pdev)
{
return 0;
}
#endif
extern u32 pnv_get_supported_cpuidle_states(void);
extern void pnv_lpc_init(void);
extern void opal_handle_events(uint64_t events);
extern void opal_event_shutdown(void);
bool cpu_core_split_required(void);
#endif /* _POWERNV_H */