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kernel_samsung_sm7125/arch/ia64/hp/common/hwsw_iommu.c

196 lines
5.9 KiB

/*
* Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
* Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
*
* This is a pseudo I/O MMU which dispatches to the hardware I/O MMU
* whenever possible. We assume that the hardware I/O MMU requires
* full 32-bit addressability, as is the case, e.g., for HP zx1-based
* systems (there, the I/O MMU window is mapped at 3-4GB). If a
* device doesn't provide full 32-bit addressability, we fall back on
* the sw I/O TLB. This is good enough to let us support broken
* hardware such as soundcards which have a DMA engine that can
* address only 28 bits.
*/
#include <linux/device.h>
#include <linux/swiotlb.h>
#include <asm/machvec.h>
/* swiotlb declarations & definitions: */
extern int swiotlb_late_init_with_default_size (size_t size);
/* hwiommu declarations & definitions: */
extern ia64_mv_dma_alloc_coherent sba_alloc_coherent;
extern ia64_mv_dma_free_coherent sba_free_coherent;
extern ia64_mv_dma_map_single_attrs sba_map_single_attrs;
extern ia64_mv_dma_unmap_single_attrs sba_unmap_single_attrs;
extern ia64_mv_dma_map_sg_attrs sba_map_sg_attrs;
extern ia64_mv_dma_unmap_sg_attrs sba_unmap_sg_attrs;
extern ia64_mv_dma_supported sba_dma_supported;
extern ia64_mv_dma_mapping_error sba_dma_mapping_error;
#define hwiommu_alloc_coherent sba_alloc_coherent
#define hwiommu_free_coherent sba_free_coherent
#define hwiommu_map_single_attrs sba_map_single_attrs
#define hwiommu_unmap_single_attrs sba_unmap_single_attrs
#define hwiommu_map_sg_attrs sba_map_sg_attrs
#define hwiommu_unmap_sg_attrs sba_unmap_sg_attrs
#define hwiommu_dma_supported sba_dma_supported
#define hwiommu_dma_mapping_error sba_dma_mapping_error
#define hwiommu_sync_single_for_cpu machvec_dma_sync_single
#define hwiommu_sync_sg_for_cpu machvec_dma_sync_sg
#define hwiommu_sync_single_for_device machvec_dma_sync_single
#define hwiommu_sync_sg_for_device machvec_dma_sync_sg
/*
* Note: we need to make the determination of whether or not to use
* the sw I/O TLB based purely on the device structure. Anything else
* would be unreliable or would be too intrusive.
*/
static inline int
use_swiotlb (struct device *dev)
{
return dev && dev->dma_mask && !hwiommu_dma_supported(dev, *dev->dma_mask);
}
void __init
hwsw_init (void)
{
/* default to a smallish 2MB sw I/O TLB */
if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
#ifdef CONFIG_IA64_GENERIC
/* Better to have normal DMA than panic */
printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
" reverting to hpzx1 platform vector\n", __func__);
machvec_init("hpzx1");
#else
panic("Unable to initialize software I/O TLB services");
#endif
}
}
void *
hwsw_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flags)
{
if (use_swiotlb(dev))
return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
else
return hwiommu_alloc_coherent(dev, size, dma_handle, flags);
}
void
hwsw_free_coherent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
{
if (use_swiotlb(dev))
swiotlb_free_coherent(dev, size, vaddr, dma_handle);
else
hwiommu_free_coherent(dev, size, vaddr, dma_handle);
}
dma_addr_t
hwsw_map_single_attrs(struct device *dev, void *addr, size_t size, int dir,
struct dma_attrs *attrs)
{
if (use_swiotlb(dev))
return swiotlb_map_single_attrs(dev, addr, size, dir, attrs);
else
return hwiommu_map_single_attrs(dev, addr, size, dir, attrs);
}
EXPORT_SYMBOL(hwsw_map_single_attrs);
void
hwsw_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
int dir, struct dma_attrs *attrs)
{
if (use_swiotlb(dev))
return swiotlb_unmap_single_attrs(dev, iova, size, dir, attrs);
else
return hwiommu_unmap_single_attrs(dev, iova, size, dir, attrs);
}
EXPORT_SYMBOL(hwsw_unmap_single_attrs);
int
hwsw_map_sg_attrs(struct device *dev, struct scatterlist *sglist, int nents,
int dir, struct dma_attrs *attrs)
{
if (use_swiotlb(dev))
return swiotlb_map_sg_attrs(dev, sglist, nents, dir, attrs);
else
return hwiommu_map_sg_attrs(dev, sglist, nents, dir, attrs);
}
EXPORT_SYMBOL(hwsw_map_sg_attrs);
void
hwsw_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist, int nents,
int dir, struct dma_attrs *attrs)
{
if (use_swiotlb(dev))
return swiotlb_unmap_sg_attrs(dev, sglist, nents, dir, attrs);
else
return hwiommu_unmap_sg_attrs(dev, sglist, nents, dir, attrs);
}
EXPORT_SYMBOL(hwsw_unmap_sg_attrs);
void
hwsw_sync_single_for_cpu (struct device *dev, dma_addr_t addr, size_t size, int dir)
{
if (use_swiotlb(dev))
swiotlb_sync_single_for_cpu(dev, addr, size, dir);
else
hwiommu_sync_single_for_cpu(dev, addr, size, dir);
}
void
hwsw_sync_sg_for_cpu (struct device *dev, struct scatterlist *sg, int nelems, int dir)
{
if (use_swiotlb(dev))
swiotlb_sync_sg_for_cpu(dev, sg, nelems, dir);
else
hwiommu_sync_sg_for_cpu(dev, sg, nelems, dir);
}
void
hwsw_sync_single_for_device (struct device *dev, dma_addr_t addr, size_t size, int dir)
{
if (use_swiotlb(dev))
swiotlb_sync_single_for_device(dev, addr, size, dir);
else
hwiommu_sync_single_for_device(dev, addr, size, dir);
}
void
hwsw_sync_sg_for_device (struct device *dev, struct scatterlist *sg, int nelems, int dir)
{
if (use_swiotlb(dev))
swiotlb_sync_sg_for_device(dev, sg, nelems, dir);
else
hwiommu_sync_sg_for_device(dev, sg, nelems, dir);
}
int
hwsw_dma_supported (struct device *dev, u64 mask)
{
if (hwiommu_dma_supported(dev, mask))
return 1;
return swiotlb_dma_supported(dev, mask);
}
int
dma-mapping: add the device argument to dma_mapping_error() Add per-device dma_mapping_ops support for CONFIG_X86_64 as POWER architecture does: This enables us to cleanly fix the Calgary IOMMU issue that some devices are not behind the IOMMU (http://lkml.org/lkml/2008/5/8/423). I think that per-device dma_mapping_ops support would be also helpful for KVM people to support PCI passthrough but Andi thinks that this makes it difficult to support the PCI passthrough (see the above thread). So I CC'ed this to KVM camp. Comments are appreciated. A pointer to dma_mapping_ops to struct dev_archdata is added. If the pointer is non NULL, DMA operations in asm/dma-mapping.h use it. If it's NULL, the system-wide dma_ops pointer is used as before. If it's useful for KVM people, I plan to implement a mechanism to register a hook called when a new pci (or dma capable) device is created (it works with hot plugging). It enables IOMMUs to set up an appropriate dma_mapping_ops per device. The major obstacle is that dma_mapping_error doesn't take a pointer to the device unlike other DMA operations. So x86 can't have dma_mapping_ops per device. Note all the POWER IOMMUs use the same dma_mapping_error function so this is not a problem for POWER but x86 IOMMUs use different dma_mapping_error functions. The first patch adds the device argument to dma_mapping_error. The patch is trivial but large since it touches lots of drivers and dma-mapping.h in all the architecture. This patch: dma_mapping_error() doesn't take a pointer to the device unlike other DMA operations. So we can't have dma_mapping_ops per device. Note that POWER already has dma_mapping_ops per device but all the POWER IOMMUs use the same dma_mapping_error function. x86 IOMMUs use device argument. [akpm@linux-foundation.org: fix sge] [akpm@linux-foundation.org: fix svc_rdma] [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix bnx2x] [akpm@linux-foundation.org: fix s2io] [akpm@linux-foundation.org: fix pasemi_mac] [akpm@linux-foundation.org: fix sdhci] [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix sparc] [akpm@linux-foundation.org: fix ibmvscsi] Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
17 years ago
hwsw_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
dma-mapping: add the device argument to dma_mapping_error() Add per-device dma_mapping_ops support for CONFIG_X86_64 as POWER architecture does: This enables us to cleanly fix the Calgary IOMMU issue that some devices are not behind the IOMMU (http://lkml.org/lkml/2008/5/8/423). I think that per-device dma_mapping_ops support would be also helpful for KVM people to support PCI passthrough but Andi thinks that this makes it difficult to support the PCI passthrough (see the above thread). So I CC'ed this to KVM camp. Comments are appreciated. A pointer to dma_mapping_ops to struct dev_archdata is added. If the pointer is non NULL, DMA operations in asm/dma-mapping.h use it. If it's NULL, the system-wide dma_ops pointer is used as before. If it's useful for KVM people, I plan to implement a mechanism to register a hook called when a new pci (or dma capable) device is created (it works with hot plugging). It enables IOMMUs to set up an appropriate dma_mapping_ops per device. The major obstacle is that dma_mapping_error doesn't take a pointer to the device unlike other DMA operations. So x86 can't have dma_mapping_ops per device. Note all the POWER IOMMUs use the same dma_mapping_error function so this is not a problem for POWER but x86 IOMMUs use different dma_mapping_error functions. The first patch adds the device argument to dma_mapping_error. The patch is trivial but large since it touches lots of drivers and dma-mapping.h in all the architecture. This patch: dma_mapping_error() doesn't take a pointer to the device unlike other DMA operations. So we can't have dma_mapping_ops per device. Note that POWER already has dma_mapping_ops per device but all the POWER IOMMUs use the same dma_mapping_error function. x86 IOMMUs use device argument. [akpm@linux-foundation.org: fix sge] [akpm@linux-foundation.org: fix svc_rdma] [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix bnx2x] [akpm@linux-foundation.org: fix s2io] [akpm@linux-foundation.org: fix pasemi_mac] [akpm@linux-foundation.org: fix sdhci] [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix sparc] [akpm@linux-foundation.org: fix ibmvscsi] Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
17 years ago
return hwiommu_dma_mapping_error(dev, dma_addr) ||
swiotlb_dma_mapping_error(dev, dma_addr);
}
EXPORT_SYMBOL(hwsw_dma_mapping_error);
EXPORT_SYMBOL(hwsw_dma_supported);
EXPORT_SYMBOL(hwsw_alloc_coherent);
EXPORT_SYMBOL(hwsw_free_coherent);
EXPORT_SYMBOL(hwsw_sync_single_for_cpu);
EXPORT_SYMBOL(hwsw_sync_single_for_device);
EXPORT_SYMBOL(hwsw_sync_sg_for_cpu);
EXPORT_SYMBOL(hwsw_sync_sg_for_device);