Release 4.16 arch/ia64/kernel/pci-dma.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 <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;

extern struct dma_map_ops intel_dma_ops;



static int __init pci_iommu_init(void)
{
	if (iommu_detected)
		intel_iommu_init();

	return 0;
}

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/* Must execute after PCI subsystem */
fs_initcall(pci_iommu_init);



void pci_iommu_shutdown(void)
{
	return;
}

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void __init

iommu_dma_init(void)
{
	return;
}

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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;
}
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EXPORT_SYMBOL(iommu_dma_supported);



void __init pci_iommu_alloc(void)
{
	dma_ops = &intel_dma_ops;

	intel_dma_ops.sync_single_for_cpu = machvec_dma_sync_single;
	intel_dma_ops.sync_sg_for_cpu = machvec_dma_sync_sg;
	intel_dma_ops.sync_single_for_device = machvec_dma_sync_single;
	intel_dma_ops.sync_sg_for_device = machvec_dma_sync_sg;
	intel_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
	if (!iommu_detected) {
#ifdef CONFIG_IA64_GENERIC
		printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
		machvec_init("dig");
		swiotlb_dma_init();
#else
		panic("Unable to find Intel IOMMU");
#endif /* CONFIG_IA64_GENERIC */
	}
#endif /* CONFIG_SWIOTLB */
}
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Directory: arch/ia64/kernel

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