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x86/amd-iommu: Add passthrough mode initialization functions
When iommu=pt is passed on kernel command line the devices should run untranslated. This requires the allocation of a special domain for that purpose. This patch implements the allocation and initialization path for iommu=pt. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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3 changed files with 69 additions and 8 deletions
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@ -25,6 +25,7 @@
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#ifdef CONFIG_AMD_IOMMU
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extern int amd_iommu_init(void);
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extern int amd_iommu_init_dma_ops(void);
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extern int amd_iommu_init_passthrough(void);
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extern void amd_iommu_detect(void);
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extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
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extern void amd_iommu_flush_all_domains(void);
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@ -143,6 +143,7 @@
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#define EVT_BUFFER_SIZE 8192 /* 512 entries */
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#define EVT_LEN_MASK (0x9ULL << 56)
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#define PAGE_MODE_NONE 0x00
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#define PAGE_MODE_1_LEVEL 0x01
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#define PAGE_MODE_2_LEVEL 0x02
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#define PAGE_MODE_3_LEVEL 0x03
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@ -194,6 +195,9 @@
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#define PD_DMA_OPS_MASK (1UL << 0) /* domain used for dma_ops */
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#define PD_DEFAULT_MASK (1UL << 1) /* domain is a default dma_ops
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domain for an IOMMU */
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#define PD_PASSTHROUGH_MASK (1UL << 2) /* domain has no page
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translation */
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extern bool amd_iommu_dump;
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#define DUMP_printk(format, arg...) \
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do { \
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@ -41,6 +41,12 @@ static DEFINE_RWLOCK(amd_iommu_devtable_lock);
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static LIST_HEAD(iommu_pd_list);
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static DEFINE_SPINLOCK(iommu_pd_list_lock);
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/*
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* Domain for untranslated devices - only allocated
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* if iommu=pt passed on kernel cmd line.
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*/
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static struct protection_domain *pt_domain;
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#ifdef CONFIG_IOMMU_API
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static struct iommu_ops amd_iommu_ops;
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#endif
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@ -1067,9 +1073,9 @@ static struct protection_domain *domain_for_device(u16 devid)
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* If a device is not yet associated with a domain, this function does
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* assigns it visible for the hardware
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*/
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static void attach_device(struct amd_iommu *iommu,
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struct protection_domain *domain,
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u16 devid)
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static void __attach_device(struct amd_iommu *iommu,
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struct protection_domain *domain,
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u16 devid)
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{
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unsigned long flags;
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u64 pte_root = virt_to_phys(domain->pt_root);
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@ -1087,12 +1093,19 @@ static void attach_device(struct amd_iommu *iommu,
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amd_iommu_pd_table[devid] = domain;
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write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
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}
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/*
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* We might boot into a crash-kernel here. The crashed kernel
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* left the caches in the IOMMU dirty. So we have to flush
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* here to evict all dirty stuff.
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*/
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static void attach_device(struct amd_iommu *iommu,
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struct protection_domain *domain,
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u16 devid)
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{
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__attach_device(iommu, domain, devid);
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/*
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* We might boot into a crash-kernel here. The crashed kernel
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* left the caches in the IOMMU dirty. So we have to flush
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* here to evict all dirty stuff.
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*/
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iommu_queue_inv_dev_entry(iommu, devid);
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iommu_flush_tlb_pde(iommu, domain->id);
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}
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@ -2219,3 +2232,46 @@ static struct iommu_ops amd_iommu_ops = {
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.domain_has_cap = amd_iommu_domain_has_cap,
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};
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/*****************************************************************************
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*
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* The next functions do a basic initialization of IOMMU for pass through
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* mode
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*
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* In passthrough mode the IOMMU is initialized and enabled but not used for
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* DMA-API translation.
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*
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*****************************************************************************/
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int __init amd_iommu_init_passthrough(void)
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{
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struct pci_dev *dev = NULL;
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u16 devid, devid2;
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/* allocate passthroug domain */
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pt_domain = protection_domain_alloc();
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if (!pt_domain)
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return -ENOMEM;
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pt_domain->mode |= PAGE_MODE_NONE;
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while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
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struct amd_iommu *iommu;
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devid = calc_devid(dev->bus->number, dev->devfn);
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if (devid > amd_iommu_last_bdf)
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continue;
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devid2 = amd_iommu_alias_table[devid];
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iommu = amd_iommu_rlookup_table[devid2];
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if (!iommu)
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continue;
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__attach_device(iommu, pt_domain, devid);
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__attach_device(iommu, pt_domain, devid2);
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}
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pr_info("AMD-Vi: Initialized for Passthrough Mode\n");
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return 0;
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}
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