Release 4.18 arch/x86/kernel/pci-swiotlb.c

// SPDX-License-Identifier: GPL-2.0
/* Glue code to lib/swiotlb.c */

#include <linux/pci.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/swiotlb.h>
#include <linux/bootmem.h>
#include <linux/dma-direct.h>
#include <linux/mem_encrypt.h>

#include <asm/iommu.h>
#include <asm/swiotlb.h>
#include <asm/dma.h>
#include <asm/xen/swiotlb-xen.h>
#include <asm/iommu_table.h>


int swiotlb __read_mostly;

/*
 * pci_swiotlb_detect_override - set swiotlb to 1 if necessary
 *
 * This returns non-zero if we are forced to use swiotlb (by the boot
 * option).
 */


int __init pci_swiotlb_detect_override(void)
{
	if (swiotlb_force == SWIOTLB_FORCE)
		swiotlb = 1;

	return swiotlb;
}
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Muli Ben-Yehuda
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3
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2
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Jan Beulich
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16.67%
FUJITA Tomonori
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6
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IOMMU_INIT_FINISH(pci_swiotlb_detect_override,
		  pci_xen_swiotlb_detect,
		  pci_swiotlb_init,
		  pci_swiotlb_late_init);

/*
 * If 4GB or more detected (and iommu=off not set) or if SME is active
 * then set swiotlb to 1 and return 1.
 */


int __init pci_swiotlb_detect_4gb(void)
{
	/* don't initialize swiotlb if iommu=off (no_iommu=1) */
#ifdef CONFIG_X86_64
	if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
		swiotlb = 1;
#endif

	/*
         * If SME is active then swiotlb will be set to 1 so that bounce
         * buffers are allocated and used for devices that do not support
         * the addressing range required for the encryption mask.
         */
	if (sme_active())
		swiotlb = 1;

	return swiotlb;
}
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Konrad Rzeszutek Wilk
8
20.00%
1
14.29%
Jeremy Fitzhardinge
5
12.50%
1
14.29%
Andi Kleen
5
12.50%
1
14.29%
FUJITA Tomonori
3
7.50%
1
14.29%
Igor Mammedov
1
2.50%
1
14.29%
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40
100.00%
7
100.00%

IOMMU_INIT(pci_swiotlb_detect_4gb,
	   pci_swiotlb_detect_override,
	   pci_swiotlb_init,
	   pci_swiotlb_late_init);



void __init pci_swiotlb_init(void)
{
	if (swiotlb) {
		swiotlb_init(0);
		dma_ops = &swiotlb_dma_ops;
	}
}

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1
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24
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5
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void __init pci_swiotlb_late_init(void)
{
	/* An IOMMU turned us off. */
	if (!swiotlb)
		swiotlb_exit();
	else {
		printk(KERN_INFO "PCI-DMA: "
		       "Using software bounce buffering for IO (SWIOTLB)\n");
		swiotlb_print_info();
	}
}
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30
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2
100.00%

Overall Contributors
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78
43.09%
2
10.00%
Muli Ben-Yehuda
47
25.97%
1
5.00%
FUJITA Tomonori
16
8.84%
4
20.00%
Tom Lendacky
14
7.73%
1
5.00%
Jeremy Fitzhardinge
11
6.08%
2
10.00%
Andi Kleen
5
2.76%
1
5.00%
Christoph Hellwig
3
1.66%
3
15.00%
Geert Uytterhoeven
3
1.66%
2
10.00%
Paul Gortmaker
1
0.55%
1
5.00%
Igor Mammedov
1
0.55%
1
5.00%
Jan Beulich
1
0.55%
1
5.00%
Greg Kroah-Hartman
1
0.55%
1
5.00%
Total
181
100.00%
20
100.00%
Directory: arch/x86/kernel

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