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Date: Wed, 4 Jan 2017 13:32:12 +0000 From: Eric Auger <eric.auger@...hat.com> To: eric.auger@...hat.com, eric.auger.pro@...il.com, christoffer.dall@...aro.org, marc.zyngier@....com, robin.murphy@....com, alex.williamson@...hat.com, will.deacon@....com, joro@...tes.org, tglx@...utronix.de, jason@...edaemon.net, linux-arm-kernel@...ts.infradead.org Cc: kvm@...r.kernel.org, drjones@...hat.com, linux-kernel@...r.kernel.org, pranav.sawargaonkar@...il.com, iommu@...ts.linux-foundation.org, punit.agrawal@....com, diana.craciun@....com, gpkulkarni@...il.com, shankerd@...eaurora.org, bharat.bhushan@....com, geethasowjanya.akula@...il.com Subject: [PATCH v5 03/17] iommu: Add a new type field in iommu_resv_region We introduce a new field to differentiate the reserved region types and specialize the apply_resv_region implementation. Legacy direct mapped regions have IOMMU_RESV_DIRECT type. We introduce 2 new reserved memory types: - IOMMU_RESV_MSI will characterize MSI regions - IOMMU_RESV_NOMAP characterize regions that cannot by mapped. Signed-off-by: Eric Auger <eric.auger@...hat.com> --- drivers/iommu/amd_iommu.c | 1 + include/linux/iommu.h | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 04334eb..c6c3f1e 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -3186,6 +3186,7 @@ static void amd_iommu_get_resv_regions(struct device *dev, region->start = entry->address_start; region->length = entry->address_end - entry->address_start; + region->type = IOMMU_RESV_DIRECT; if (entry->prot & IOMMU_PROT_IR) region->prot |= IOMMU_READ; if (entry->prot & IOMMU_PROT_IW) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index bfecb8b..9128a8d 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -117,18 +117,25 @@ enum iommu_attr { DOMAIN_ATTR_MAX, }; +/* These are the possible reserved region types */ +#define IOMMU_RESV_DIRECT (1 << 0) +#define IOMMU_RESV_NOMAP (1 << 1) +#define IOMMU_RESV_MSI (1 << 2) + /** * struct iommu_resv_region - descriptor for a reserved memory region * @list: Linked list pointers * @start: System physical start address of the region * @length: Length of the region in bytes * @prot: IOMMU Protection flags (READ/WRITE/...) + * @type: Type of the reserved region */ struct iommu_resv_region { struct list_head list; phys_addr_t start; size_t length; int prot; + int type; }; #ifdef CONFIG_IOMMU_API -- 1.9.1
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