Commit 6a5c7be5 authored by Milton Miller's avatar Milton Miller Committed by Benjamin Herrenschmidt
Browse files

powerpc: Override dma_get_required_mask by platform hook and ops 



The hook dma_get_required_mask is supposed to return the mask required
by the platform to operate efficently.  The generic version of
dma_get_required_mask in driver/base/platform.c returns a mask based
only on max_pfn.  However, this is likely too big for iommu systems
and could be too small for platforms that require a dma offset or have
a secondary window at a high offset.

Override the default, provide a hook in ppc_md used by pseries lpar and
cell, and provide the default answer based on memblock_end_of_DRAM(),
with hooks for get_dma_offset, and provide an implementation for iommu
that looks at the defined table size.  Coverting from the end address
to the required bit mask is based on the generic implementation.

The need for this was discovered when the qla2xxx driver switched to
64 bit dma then reverted to 32 bit when dma_get_required_mask said
32 bits was sufficient.

Signed-off-by: default avatarMilton Miller <miltonm@bga.com>
Signed-off-by: default avatarNishanth Aravamudan <nacc@us.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: benh@kernel.crashing.org
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent ce395088

arch/powerpc/include/asm/dma-mapping.h

+3 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 


#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)



#define ARCH_HAS_DMA_GET_REQUIRED_MASK



/* Some dma direct funcs must be visible for use in other dma_ops */

extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,

				       dma_addr_t *dma_handle, gfp_t flag);
@@ -69,6 +71,7 @@ static inline unsigned long device_to_mask(struct device *dev) 
 */

#ifdef CONFIG_PPC64

extern struct dma_map_ops dma_iommu_ops;

extern u64 dma_iommu_get_required_mask(struct device *dev);

#endif

extern struct dma_map_ops dma_direct_ops;

arch/powerpc/include/asm/machdep.h

+2 −1
Original line number Diff line number Diff line
@@ -85,8 +85,9 @@ struct machdep_calls { 
	void		(*pci_dma_dev_setup)(struct pci_dev *dev);

	void		(*pci_dma_bus_setup)(struct pci_bus *bus);



	/* Platform set_dma_mask override */

	/* Platform set_dma_mask and dma_get_required_mask overrides */

	int		(*dma_set_mask)(struct device *dev, u64 dma_mask);

	u64		(*dma_get_required_mask)(struct device *dev);



	int		(*probe)(void);

	void		(*setup_arch)(void); /* Optional, may be NULL */

arch/powerpc/kernel/dma-iommu.c

+13 −0
Original line number Diff line number Diff line
@@ -90,6 +90,19 @@ static int dma_iommu_dma_supported(struct device *dev, u64 mask) 
		return 1;

}



u64 dma_iommu_get_required_mask(struct device *dev)

{

	struct iommu_table *tbl = get_iommu_table_base(dev);

	u64 mask;

	if (!tbl)

		return 0;



	mask = 1ULL < (fls_long(tbl->it_offset + tbl->it_size) - 1);

	mask += mask - 1;



	return mask;

}



struct dma_map_ops dma_iommu_ops = {

	.alloc_coherent	= dma_iommu_alloc_coherent,

	.free_coherent	= dma_iommu_free_coherent,

arch/powerpc/kernel/dma.c

+39 −0
Original line number Diff line number Diff line
@@ -170,6 +170,45 @@ int dma_set_mask(struct device *dev, u64 dma_mask) 
}

EXPORT_SYMBOL(dma_set_mask);



u64 dma_get_required_mask(struct device *dev)

{

	struct dma_map_ops *dma_ops = get_dma_ops(dev);

	u64 mask, end = 0;



	if (ppc_md.dma_get_required_mask)

		return ppc_md.dma_get_required_mask(dev);



	if (unlikely(dma_ops == NULL))

		return 0;



#ifdef CONFIG_PPC64

	else if (dma_ops == &dma_iommu_ops)

		return dma_iommu_get_required_mask(dev);

#endif

#ifdef CONFIG_SWIOTLB

	else if (dma_ops == &swiotlb_dma_ops) {

		u64 max_direct_dma_addr = dev->archdata.max_direct_dma_addr;



		end = memblock_end_of_DRAM();

		if (max_direct_dma_addr && end > max_direct_dma_addr)

			end = max_direct_dma_addr;

		end += get_dma_offset(dev);

	}

#endif

	else if (dma_ops == &dma_direct_ops)

		end = memblock_end_of_DRAM() + get_dma_offset(dev);

	else {

		WARN_ONCE(1, "%s: unknown ops %p\n", __func__, dma_ops);

		end = memblock_end_of_DRAM();

	}



	mask = 1ULL << (fls64(end) - 1);

	mask += mask - 1;



	return mask;

}

EXPORT_SYMBOL_GPL(dma_get_required_mask);



static int __init dma_init(void)

{

       dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);

arch/powerpc/platforms/cell/iommu.c

+12 −0
Original line number Diff line number Diff line
@@ -1159,6 +1159,17 @@ static int __init setup_iommu_fixed(char *str) 
}

__setup("iommu_fixed=", setup_iommu_fixed);



static u64 cell_dma_get_required_mask(struct device *dev)

{

	if (!dev->dma_mask)

		return 0;



	if (iommu_fixed_disabled && get_dma_ops(dev) == &dma_iommu_ops)

		return dma_iommu_get_required_mask(dev);



	return DMA_BIT_MASK(64);

}



static int __init cell_iommu_init(void)

{

	struct device_node *np;
@@ -1175,6 +1186,7 @@ static int __init cell_iommu_init(void) 


	/* Setup various ppc_md. callbacks */

	ppc_md.pci_dma_dev_setup = cell_pci_dma_dev_setup;

	ppc_md.dma_get_required_mask = cell_dma_get_required_mask;

	ppc_md.tce_build = tce_build_cell;

	ppc_md.tce_free = tce_free_cell;

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