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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/dma-map-ops.h>
- #include <linux/dma-direct.h>
- #include <linux/iommu.h>
- #include <linux/dmar.h>
- #include <linux/export.h>
- #include <linux/memblock.h>
- #include <linux/gfp.h>
- #include <linux/pci.h>
- #include <asm/proto.h>
- #include <asm/dma.h>
- #include <asm/iommu.h>
- #include <asm/gart.h>
- #include <asm/x86_init.h>
- #include <asm/iommu_table.h>
- static bool disable_dac_quirk __read_mostly;
- const struct dma_map_ops *dma_ops;
- EXPORT_SYMBOL(dma_ops);
- #ifdef CONFIG_IOMMU_DEBUG
- int panic_on_overflow __read_mostly = 1;
- int force_iommu __read_mostly = 1;
- #else
- int panic_on_overflow __read_mostly = 0;
- int force_iommu __read_mostly = 0;
- #endif
- int iommu_merge __read_mostly = 0;
- int no_iommu __read_mostly;
- /* Set this to 1 if there is a HW IOMMU in the system */
- int iommu_detected __read_mostly = 0;
- extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
- void __init pci_iommu_alloc(void)
- {
- struct iommu_table_entry *p;
- sort_iommu_table(__iommu_table, __iommu_table_end);
- check_iommu_entries(__iommu_table, __iommu_table_end);
- for (p = __iommu_table; p < __iommu_table_end; p++) {
- if (p && p->detect && p->detect() > 0) {
- p->flags |= IOMMU_DETECTED;
- if (p->early_init)
- p->early_init();
- if (p->flags & IOMMU_FINISH_IF_DETECTED)
- break;
- }
- }
- }
- /*
- * See <Documentation/x86/x86_64/boot-options.rst> for the iommu kernel
- * parameter documentation.
- */
- static __init int iommu_setup(char *p)
- {
- iommu_merge = 1;
- if (!p)
- return -EINVAL;
- while (*p) {
- if (!strncmp(p, "off", 3))
- no_iommu = 1;
- /* gart_parse_options has more force support */
- if (!strncmp(p, "force", 5))
- force_iommu = 1;
- if (!strncmp(p, "noforce", 7)) {
- iommu_merge = 0;
- force_iommu = 0;
- }
- if (!strncmp(p, "biomerge", 8)) {
- iommu_merge = 1;
- force_iommu = 1;
- }
- if (!strncmp(p, "panic", 5))
- panic_on_overflow = 1;
- if (!strncmp(p, "nopanic", 7))
- panic_on_overflow = 0;
- if (!strncmp(p, "merge", 5)) {
- iommu_merge = 1;
- force_iommu = 1;
- }
- if (!strncmp(p, "nomerge", 7))
- iommu_merge = 0;
- if (!strncmp(p, "forcesac", 8))
- pr_warn("forcesac option ignored.\n");
- if (!strncmp(p, "allowdac", 8))
- pr_warn("allowdac option ignored.\n");
- if (!strncmp(p, "nodac", 5))
- pr_warn("nodac option ignored.\n");
- if (!strncmp(p, "usedac", 6)) {
- disable_dac_quirk = true;
- return 1;
- }
- #ifdef CONFIG_SWIOTLB
- if (!strncmp(p, "soft", 4))
- swiotlb = 1;
- #endif
- if (!strncmp(p, "pt", 2))
- iommu_set_default_passthrough(true);
- if (!strncmp(p, "nopt", 4))
- iommu_set_default_translated(true);
- gart_parse_options(p);
- p += strcspn(p, ",");
- if (*p == ',')
- ++p;
- }
- return 0;
- }
- early_param("iommu", iommu_setup);
- static int __init pci_iommu_init(void)
- {
- struct iommu_table_entry *p;
- x86_init.iommu.iommu_init();
- for (p = __iommu_table; p < __iommu_table_end; p++) {
- if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
- p->late_init();
- }
- return 0;
- }
- /* Must execute after PCI subsystem */
- rootfs_initcall(pci_iommu_init);
- #ifdef CONFIG_PCI
- /* Many VIA bridges seem to corrupt data for DAC. Disable it here */
- static int via_no_dac_cb(struct pci_dev *pdev, void *data)
- {
- pdev->dev.bus_dma_limit = DMA_BIT_MASK(32);
- return 0;
- }
- static void via_no_dac(struct pci_dev *dev)
- {
- if (!disable_dac_quirk) {
- dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n");
- pci_walk_bus(dev->subordinate, via_no_dac_cb, NULL);
- }
- }
- DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
- PCI_CLASS_BRIDGE_PCI, 8, via_no_dac);
- #endif
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