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![Linus Torvalds](/assets/img/avatar_default.png)
This time with bigger changes than usual: * A new IOMMU driver for the ARM SMMUv3. This IOMMU is pretty different from SMMUv1 and v2 in that it is configured through in-memory structures and not through the MMIO register region. The ARM SMMUv3 also supports IO demand paging for PCI devices with PRI/PASID capabilities, but this is not implemented in the driver yet. * Lots of cleanups and device-tree support for the Exynos IOMMU driver. This is part of the effort to bring Exynos DRM support upstream. * Introduction of default domains into the IOMMU core code. The rationale behind this is to move functionalily out of the IOMMU drivers to common code to get to a unified behavior between different drivers. The patches here introduce a default domain for iommu-groups (isolation groups). A device will now always be attached to a domain, either the default domain or another domain handled by the device driver. The IOMMU drivers have to be modified to make use of that feature. So long the AMD IOMMU driver is converted, with others to follow. * Patches for the Intel VT-d drvier to fix DMAR faults that happen when a kdump kernel boots. When the kdump kernel boots it re-initializes the IOMMU hardware, which destroys all mappings from the crashed kernel. As this happens before the endpoint devices are re-initialized, any in-flight DMA causes a DMAR fault. These faults cause PCI master aborts, which some devices can't handle properly and go into an undefined state, so that the device driver in the kdump kernel fails to initialize them and the dump fails. This is now fixed by copying over the mapping structures (only context tables and interrupt remapping tables) from the old kernel and keep the old mappings in place until the device driver of the new kernel takes over. This emulates the the behavior without an IOMMU to the best degree possible. * A couple of other small fixes and cleanups. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABAgAGBQJViSIWAAoJECvwRC2XARrjl+cP/2FXS7SWDq91VFiIZfXfPt8H C5Ef3OGWCnMzn4MKE1ExkyDhC+AH6pF1s4zi3XfT6b8iOA+DUpa51rxJjixszt31 tQwmvB7hWu4mznGxSN7EA0Pm0l/v3tBAY5BvG598af0aNZFFJ6po+31MyQA5X67+ 6xpqLbH/hm4IZhFBOEzZwxuWWsNxlJwwzKqeAjGyqeUhdruRYZiPHWQ17sDjwLM/ QcVvWBb7meOtKv1OCtpzC4sglSk3scbAfEHMEBuDt8cI6OD7/t2VzPXDWWZuXGqK nRAxCT7NrXvyOnv0xwdn0j5p1FUGipVxvhsGWX7sJsh3UHWm8Q+5rRKFFVI9pm50 QcMjiIMazK5VwcAkDnLoDgSz4Zz6TfHXEOqSJ2vjTPt2VDP/J9zdM2iwHx2ujicI mIkrtmsBprvAPx6e9jcqiS5L/Xy1y1xewXuGxa5F2XOjqdoXkPqaupjlyrWzrChA MC8w67FdzjHDPCfIqfIWZpJQj4f1OFQGd3HS5HpkBACxIwCg85gRw4DEMfD/sirO BL2VM0RO/bB5+4R0AY7UA2VszQvNMqedj1bA4vAbrnXqOh8BI/0GgeoWiBMXhyX1 qvT1jl+cxuCm5tgBOMUGYoRyF+//bH+l78jLsTYaWRtuVzFlkAX6idNvYYK0dmNt tLII2IIZBk87P3pF4d6A =Zicw -----END PGP SIGNATURE----- Merge tag 'iommu-updates-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu Pull IOMMU updates from Joerg Roedel: "This time with bigger changes than usual: - A new IOMMU driver for the ARM SMMUv3. This IOMMU is pretty different from SMMUv1 and v2 in that it is configured through in-memory structures and not through the MMIO register region. The ARM SMMUv3 also supports IO demand paging for PCI devices with PRI/PASID capabilities, but this is not implemented in the driver yet. - Lots of cleanups and device-tree support for the Exynos IOMMU driver. This is part of the effort to bring Exynos DRM support upstream. - Introduction of default domains into the IOMMU core code. The rationale behind this is to move functionalily out of the IOMMU drivers to common code to get to a unified behavior between different drivers. The patches here introduce a default domain for iommu-groups (isolation groups). A device will now always be attached to a domain, either the default domain or another domain handled by the device driver. The IOMMU drivers have to be modified to make use of that feature. So long the AMD IOMMU driver is converted, with others to follow. - Patches for the Intel VT-d drvier to fix DMAR faults that happen when a kdump kernel boots. When the kdump kernel boots it re-initializes the IOMMU hardware, which destroys all mappings from the crashed kernel. As this happens before the endpoint devices are re-initialized, any in-flight DMA causes a DMAR fault. These faults cause PCI master aborts, which some devices can't handle properly and go into an undefined state, so that the device driver in the kdump kernel fails to initialize them and the dump fails. This is now fixed by copying over the mapping structures (only context tables and interrupt remapping tables) from the old kernel and keep the old mappings in place until the device driver of the new kernel takes over. This emulates the the behavior without an IOMMU to the best degree possible. - A couple of other small fixes and cleanups" * tag 'iommu-updates-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (69 commits) iommu/amd: Handle large pages correctly in free_pagetable iommu/vt-d: Don't disable IR when it was previously enabled iommu/vt-d: Make sure copied over IR entries are not reused iommu/vt-d: Copy IR table from old kernel when in kdump mode iommu/vt-d: Set IRTA in intel_setup_irq_remapping iommu/vt-d: Disable IRQ remapping in intel_prepare_irq_remapping iommu/vt-d: Move QI initializationt to intel_setup_irq_remapping iommu/vt-d: Move EIM detection to intel_prepare_irq_remapping iommu/vt-d: Enable Translation only if it was previously disabled iommu/vt-d: Don't disable translation prior to OS handover iommu/vt-d: Don't copy translation tables if RTT bit needs to be changed iommu/vt-d: Don't do early domain assignment if kdump kernel iommu/vt-d: Allocate si_domain in init_dmars() iommu/vt-d: Mark copied context entries iommu/vt-d: Do not re-use domain-ids from the old kernel iommu/vt-d: Copy translation tables from old kernel iommu/vt-d: Detect pre enabled translation iommu/vt-d: Make root entry visible for hardware right after allocation iommu/vt-d: Init QI before root entry is allocated iommu/vt-d: Cleanup log messages ...
101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
/*
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* Copyright (C) 2009-2010 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <jroedel@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_X86_AMD_IOMMU_PROTO_H
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#define _ASM_X86_AMD_IOMMU_PROTO_H
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#include "amd_iommu_types.h"
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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 irqreturn_t amd_iommu_int_thread(int irq, void *data);
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extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
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extern void amd_iommu_apply_erratum_63(u16 devid);
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extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
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extern int amd_iommu_init_devices(void);
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extern void amd_iommu_uninit_devices(void);
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extern void amd_iommu_init_notifier(void);
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extern int amd_iommu_init_api(void);
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/* Needed for interrupt remapping */
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extern int amd_iommu_prepare(void);
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extern int amd_iommu_enable(void);
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extern void amd_iommu_disable(void);
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extern int amd_iommu_reenable(int);
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extern int amd_iommu_enable_faulting(void);
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/* IOMMUv2 specific functions */
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struct iommu_domain;
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extern bool amd_iommu_v2_supported(void);
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extern int amd_iommu_register_ppr_notifier(struct notifier_block *nb);
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extern int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb);
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extern void amd_iommu_domain_direct_map(struct iommu_domain *dom);
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extern int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids);
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extern int amd_iommu_flush_page(struct iommu_domain *dom, int pasid,
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u64 address);
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extern int amd_iommu_flush_tlb(struct iommu_domain *dom, int pasid);
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extern int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid,
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unsigned long cr3);
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extern int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid);
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extern struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev);
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/* IOMMU Performance Counter functions */
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extern bool amd_iommu_pc_supported(void);
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extern u8 amd_iommu_pc_get_max_banks(u16 devid);
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extern u8 amd_iommu_pc_get_max_counters(u16 devid);
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extern int amd_iommu_pc_get_set_reg_val(u16 devid, u8 bank, u8 cntr, u8 fxn,
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u64 *value, bool is_write);
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#ifdef CONFIG_IRQ_REMAP
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extern int amd_iommu_create_irq_domain(struct amd_iommu *iommu);
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#else
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static inline int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
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{
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return 0;
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}
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#endif
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#define PPR_SUCCESS 0x0
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#define PPR_INVALID 0x1
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#define PPR_FAILURE 0xf
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extern int amd_iommu_complete_ppr(struct pci_dev *pdev, int pasid,
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int status, int tag);
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#ifndef CONFIG_AMD_IOMMU_STATS
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static inline void amd_iommu_stats_init(void) { }
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#endif /* !CONFIG_AMD_IOMMU_STATS */
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static inline bool is_rd890_iommu(struct pci_dev *pdev)
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{
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return (pdev->vendor == PCI_VENDOR_ID_ATI) &&
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(pdev->device == PCI_DEVICE_ID_RD890_IOMMU);
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}
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static inline bool iommu_feature(struct amd_iommu *iommu, u64 f)
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{
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if (!(iommu->cap & (1 << IOMMU_CAP_EFR)))
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return false;
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return !!(iommu->features & f);
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}
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#endif /* _ASM_X86_AMD_IOMMU_PROTO_H */
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