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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8b4282e6b8
On some platforms msi parent address regions have to be excluded from normal IOVA allocation in that they are detected and decoded in a HW specific way by system components and so they cannot be considered normal IOVA address space. Add a helper function that retrieves ITS address regions - the msi parent - through IORT device <-> ITS mappings and reserves it so that these regions will not be translated by IOMMU and will be excluded from IOVA allocations. The function checks for the smmu model number and only applies the msi reservation if the platform requires it. Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> [For the ITS part] Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/*
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* Copyright (C) 2016, Semihalf
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* Author: Tomasz Nowicki <tn@semihalf.com>
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*/
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#ifndef __ACPI_IORT_H__
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#define __ACPI_IORT_H__
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#include <linux/acpi.h>
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#include <linux/fwnode.h>
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#include <linux/irqdomain.h>
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#define IORT_IRQ_MASK(irq) (irq & 0xffffffffULL)
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#define IORT_IRQ_TRIGGER_MASK(irq) ((irq >> 32) & 0xffffffffULL)
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int iort_register_domain_token(int trans_id, phys_addr_t base,
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struct fwnode_handle *fw_node);
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void iort_deregister_domain_token(int trans_id);
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struct fwnode_handle *iort_find_domain_token(int trans_id);
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#ifdef CONFIG_ACPI_IORT
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void acpi_iort_init(void);
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u32 iort_msi_map_rid(struct device *dev, u32 req_id);
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struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
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void acpi_configure_pmsi_domain(struct device *dev);
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int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
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/* IOMMU interface */
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void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size);
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const struct iommu_ops *iort_iommu_configure(struct device *dev);
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int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head);
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#else
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static inline void acpi_iort_init(void) { }
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static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
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{ return req_id; }
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static inline struct irq_domain *iort_get_device_domain(struct device *dev,
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u32 req_id)
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{ return NULL; }
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static inline void acpi_configure_pmsi_domain(struct device *dev) { }
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/* IOMMU interface */
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static inline void iort_dma_setup(struct device *dev, u64 *dma_addr,
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u64 *size) { }
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static inline const struct iommu_ops *iort_iommu_configure(
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struct device *dev)
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{ return NULL; }
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static inline
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int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
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{ return 0; }
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#endif
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#endif /* __ACPI_IORT_H__ */
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