powerpc/powernv: move dma_get_required_mask from pnv_phb to pci_controller_ops

Simplify the dma_get_required_mask call chain by moving it from pnv_phb to
pci_controller_ops, similar to commit 763d2d8df1ee ("powerpc/powernv:
Move dma_set_mask from pnv_phb to pci_controller_ops").

Previous call chain:

  0) call dma_get_required_mask() (kernel/dma.c)
  1) call ppc_md.dma_get_required_mask, if it exists. On powernv, that
     points to pnv_dma_get_required_mask() (platforms/powernv/setup.c)
  2) device is PCI, therefore call pnv_pci_dma_get_required_mask()
     (platforms/powernv/pci.c)
  3) call phb->dma_get_required_mask if it exists
  4) it only exists in the ioda case, where it points to
       pnv_pci_ioda_dma_get_required_mask() (platforms/powernv/pci-ioda.c)

New call chain:

  0) call dma_get_required_mask() (kernel/dma.c)
  1) device is PCI, therefore call pci_controller_ops.dma_get_required_mask
     if it exists
  2) in the ioda case, that points to pnv_pci_ioda_dma_get_required_mask()
     (platforms/powernv/pci-ioda.c)

In the p5ioc2 case, the call chain remains the same -
dma_get_required_mask() does not find either a ppc_md call or
pci_controller_ops call, so it calls __dma_get_required_mask().

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

7 files changed, 12 insertions, 31 deletions

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 712add590445..37fc53587bb4 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -42,6 +42,7 @@ struct pci_controller_ops {
 #endif
 
         int             (*dma_set_mask)(struct pci_dev *dev, u64 dma_mask);
+        u64             (*dma_get_required_mask)(struct pci_dev *dev);
 
         void            (*shutdown)(struct pci_controller *);
 };
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 1558f81ac1ff..59503ed98e5f 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -353,6 +353,13 @@ u64 dma_get_required_mask(struct device *dev)
         if (ppc_md.dma_get_required_mask)
                 return ppc_md.dma_get_required_mask(dev);
 
+        if (dev_is_pci(dev)) {
+                struct pci_dev *pdev = to_pci_dev(dev);
+                struct pci_controller *phb = pci_bus_to_host(pdev->bus);
+                if (phb->controller_ops.dma_get_required_mask)
+                        return phb->controller_ops.dma_get_required_mask(pdev);
+        }
+
         return __dma_get_required_mask(dev);
 }
 EXPORT_SYMBOL_GPL(dma_get_required_mask);
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index fdafbaccafbe..528cd1e0b5ae 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1597,9 +1597,10 @@ static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
         return 0;
 }
 
-static u64 pnv_pci_ioda_dma_get_required_mask(struct pnv_phb *phb,
-                                              struct pci_dev *pdev)
+static u64 pnv_pci_ioda_dma_get_required_mask(struct pci_dev *pdev)
 {
+        struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+        struct pnv_phb *phb = hose->private_data;
         struct pci_dn *pdn = pci_get_pdn(pdev);
         struct pnv_ioda_pe *pe;
         u64 end, mask;
@@ -3024,6 +3025,7 @@ static const struct pci_controller_ops pnv_pci_ioda_controller_ops = {
        .window_alignment = pnv_pci_window_alignment,
        .reset_secondary_bus = pnv_pci_reset_secondary_bus,
        .dma_set_mask = pnv_pci_ioda_dma_set_mask,
+       .dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask,
        .shutdown = pnv_pci_ioda_shutdown,
 };
 
@@ -3170,7 +3172,6 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
 
         /* Setup TCEs */
         phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
-        phb->dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask;
 
         /* Setup MSI support */
         pnv_pci_init_ioda_msis(phb);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 765d8ed558d0..3e7f6fda00cf 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -761,17 +761,6 @@ void pnv_pci_dma_dev_setup(struct pci_dev *pdev)
                 phb->dma_dev_setup(phb, pdev);
 }
 
-u64 pnv_pci_dma_get_required_mask(struct pci_dev *pdev)
-{
-        struct pci_controller *hose = pci_bus_to_host(pdev->bus);
-        struct pnv_phb *phb = hose->private_data;
-
-        if (phb && phb->dma_get_required_mask)
-                return phb->dma_get_required_mask(phb, pdev);
-
-        return __dma_get_required_mask(&pdev->dev);
-}
-
 void pnv_pci_shutdown(void)
 {
         struct pci_controller *hose;
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index e891ff48d7e6..c8ff50e90766 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -105,8 +105,6 @@ struct pnv_phb {
                          unsigned int hwirq, unsigned int virq,
                          unsigned int is_64, struct msi_msg *msg);
         void (*dma_dev_setup)(struct pnv_phb *phb, struct pci_dev *pdev);
-        u64 (*dma_get_required_mask)(struct pnv_phb *phb,
-                                     struct pci_dev *pdev);
         void (*fixup_phb)(struct pci_controller *hose);
         u32 (*bdfn_to_pe)(struct pnv_phb *phb, struct pci_bus *bus, u32 devfn);
         int (*init_m64)(struct pnv_phb *phb);
diff --git a/arch/powerpc/platforms/powernv/powernv.h b/arch/powerpc/platforms/powernv/powernv.h
index 9269e30e4ca0..6dbc0a1da1f6 100644
--- a/arch/powerpc/platforms/powernv/powernv.h
+++ b/arch/powerpc/platforms/powernv/powernv.h
@@ -12,15 +12,9 @@ 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);
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 53737e019ae3..77a31c1474a5 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -165,14 +165,6 @@ static void pnv_progress(char *s, unsigned short hex)
 {
 }
 
-static u64 pnv_dma_get_required_mask(struct device *dev)
-{
-        if (dev_is_pci(dev))
-                return pnv_pci_dma_get_required_mask(to_pci_dev(dev));
-
-        return __dma_get_required_mask(dev);
-}
-
 static void pnv_shutdown(void)
 {
         /* Let the PCI code clear up IODA tables */
@@ -314,7 +306,6 @@ define_machine(powernv) {
         .machine_shutdown       = pnv_shutdown,
         .power_save             = power7_idle,
         .calibrate_decr         = generic_calibrate_decr,
-        .dma_get_required_mask  = pnv_dma_get_required_mask,
 #ifdef CONFIG_KEXEC
         .kexec_cpu_down         = pnv_kexec_cpu_down,
 #endif