[PATCH 21/33] powerpc/dma: remove get_pci_dma_ops

Christoph Hellwig
2018-10-09T13:26:33Z

This function is only used by the Cell iommu code, which can keep track
if it is using the iommu internally just as good.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/powerpc/include/asm/pci.h | 2 --
arch/powerpc/kernel/pci-common.c | 6 ------
arch/powerpc/platforms/cell/iommu.c | 17 ++++++++---------
3 files changed, 8 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h
index a01d2e3d6ff9..4f7cf0a7f89d 100644
--- a/arch/powerpc/include/asm/pci.h
+++ b/arch/powerpc/include/asm/pci.h
@@ -52,10 +52,8 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)

#ifdef CONFIG_PCI
extern void set_pci_dma_ops(const struct dma_map_ops *dma_ops);
-extern const struct dma_map_ops *get_pci_dma_ops(void);
#else /* CONFIG_PCI */
#define set_pci_dma_ops(d)
-#define get_pci_dma_ops() NULL
#endif

#ifdef CONFIG_PPC64
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 88e4f69a09e5..a84707680525 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -69,12 +69,6 @@ void set_pci_dma_ops(const struct dma_map_ops *dma_ops)
pci_dma_ops = dma_ops;
}

-const struct dma_map_ops *get_pci_dma_ops(void)
-{
- return pci_dma_ops;
-}
-EXPORT_SYMBOL(get_pci_dma_ops);
-
/*
* This function should run under locking protection, specifically
* hose_spinlock.
diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index fb51f78035ce..93c7e4aef571 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -544,6 +544,7 @@ static struct cbe_iommu *cell_iommu_for_node(int nid)
static unsigned long cell_dma_nommu_offset;

static unsigned long dma_iommu_fixed_base;
+static bool cell_iommu_enabled;

/* iommu_fixed_is_weak is set if booted with iommu_fixed=weak */
bool iommu_fixed_is_weak;
@@ -572,16 +573,14 @@ static u64 cell_iommu_get_fixed_address(struct device *dev);

static void cell_dma_dev_setup(struct device *dev)
{
- if (get_pci_dma_ops() == &dma_iommu_ops) {
+ if (cell_iommu_enabled) {
u64 addr = cell_iommu_get_fixed_address(dev);

if (addr != OF_BAD_ADDR)
set_dma_offset(dev, addr + dma_iommu_fixed_base);
set_iommu_table_base(dev, cell_get_iommu_table(dev));
- } else if (get_pci_dma_ops() == &dma_nommu_ops) {
- set_dma_offset(dev, cell_dma_nommu_offset);
} else {
- BUG();
+ set_dma_offset(dev, cell_dma_nommu_offset);
}
}

@@ -599,11 +598,11 @@ static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action,
if (action != BUS_NOTIFY_ADD_DEVICE)
return 0;

- /* We use the PCI DMA ops */
- dev->dma_ops = get_pci_dma_ops();
-
+ if (cell_iommu_enabled)
+ dev->dma_ops = &dma_iommu_ops;
+ else
+ dev->dma_ops = &dma_nommu_ops;
cell_dma_dev_setup(dev);
-
return 0;
}

@@ -1091,7 +1090,7 @@ static int __init cell_iommu_init(void)
cell_pci_iommu_bypass_supported;
}
set_pci_dma_ops(&dma_iommu_ops);
-
+ cell_iommu_enabled = true;
bail:
/* Register callbacks on OF platform device addition/removal
* to handle linking them to the right DMA operations
--
2.19.0