kernel_optimize_test/arch/ia64/kernel/pci-dma.c
Alex Williamson bcb71abe7d iommu: Add option to group multi-function devices
The option iommu=group_mf indicates the that the iommu driver should
expose all functions of a multi-function PCI device as the same
iommu_device_group.  This is useful for disallowing individual functions
being exposed as independent devices to userspace as there are often
hidden dependencies.  Virtual functions are not affected by this option.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2011-11-15 12:22:31 +01:00

122 lines
2.7 KiB
C

/*
* Dynamic DMA mapping support.
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/dmar.h>
#include <asm/iommu.h>
#include <asm/machvec.h>
#include <linux/dma-mapping.h>
#include <asm/system.h>
#ifdef CONFIG_INTEL_IOMMU
#include <linux/kernel.h>
#include <asm/page.h>
dma_addr_t bad_dma_address __read_mostly;
EXPORT_SYMBOL(bad_dma_address);
static int iommu_sac_force __read_mostly;
int no_iommu __read_mostly;
#ifdef CONFIG_IOMMU_DEBUG
int force_iommu __read_mostly = 1;
#else
int force_iommu __read_mostly;
#endif
int iommu_pass_through;
int iommu_group_mf;
/* Dummy device used for NULL arguments (normally ISA). Better would
be probably a smaller DMA mask, but this is bug-to-bug compatible
to i386. */
struct device fallback_dev = {
.init_name = "fallback device",
.coherent_dma_mask = DMA_BIT_MASK(32),
.dma_mask = &fallback_dev.coherent_dma_mask,
};
extern struct dma_map_ops intel_dma_ops;
static int __init pci_iommu_init(void)
{
if (iommu_detected)
intel_iommu_init();
return 0;
}
/* Must execute after PCI subsystem */
fs_initcall(pci_iommu_init);
void pci_iommu_shutdown(void)
{
return;
}
void __init
iommu_dma_init(void)
{
return;
}
int iommu_dma_supported(struct device *dev, u64 mask)
{
/* Copied from i386. Doesn't make much sense, because it will
only work for pci_alloc_coherent.
The caller just has to use GFP_DMA in this case. */
if (mask < DMA_BIT_MASK(24))
return 0;
/* Tell the device to use SAC when IOMMU force is on. This
allows the driver to use cheaper accesses in some cases.
Problem with this is that if we overflow the IOMMU area and
return DAC as fallback address the device may not handle it
correctly.
As a special case some controllers have a 39bit address
mode that is as efficient as 32bit (aic79xx). Don't force
SAC for these. Assume all masks <= 40 bits are of this
type. Normally this doesn't make any difference, but gives
more gentle handling of IOMMU overflow. */
if (iommu_sac_force && (mask >= DMA_BIT_MASK(40))) {
dev_info(dev, "Force SAC with mask %llx\n", mask);
return 0;
}
return 1;
}
EXPORT_SYMBOL(iommu_dma_supported);
void __init pci_iommu_alloc(void)
{
dma_ops = &intel_dma_ops;
dma_ops->sync_single_for_cpu = machvec_dma_sync_single;
dma_ops->sync_sg_for_cpu = machvec_dma_sync_sg;
dma_ops->sync_single_for_device = machvec_dma_sync_single;
dma_ops->sync_sg_for_device = machvec_dma_sync_sg;
dma_ops->dma_supported = iommu_dma_supported;
/*
* The order of these functions is important for
* fall-back/fail-over reasons
*/
detect_intel_iommu();
#ifdef CONFIG_SWIOTLB
pci_swiotlb_init();
#endif
}
#endif