mirror of https://gitee.com/openkylin/linux.git
1223 lines
34 KiB
C
1223 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* A fairly generic DMA-API to IOMMU-API glue layer.
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*
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* Copyright (C) 2014-2015 ARM Ltd.
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*
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* based in part on arch/arm/mm/dma-mapping.c:
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* Copyright (C) 2000-2004 Russell King
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*/
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#include <linux/acpi_iort.h>
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#include <linux/device.h>
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#include <linux/dma-contiguous.h>
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#include <linux/dma-iommu.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/gfp.h>
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#include <linux/huge_mm.h>
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#include <linux/iommu.h>
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#include <linux/iova.h>
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#include <linux/irq.h>
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#include <linux/mm.h>
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#include <linux/pci.h>
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#include <linux/scatterlist.h>
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#include <linux/vmalloc.h>
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struct iommu_dma_msi_page {
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struct list_head list;
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dma_addr_t iova;
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phys_addr_t phys;
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};
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enum iommu_dma_cookie_type {
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IOMMU_DMA_IOVA_COOKIE,
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IOMMU_DMA_MSI_COOKIE,
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};
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struct iommu_dma_cookie {
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enum iommu_dma_cookie_type type;
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union {
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/* Full allocator for IOMMU_DMA_IOVA_COOKIE */
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struct iova_domain iovad;
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/* Trivial linear page allocator for IOMMU_DMA_MSI_COOKIE */
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dma_addr_t msi_iova;
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};
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struct list_head msi_page_list;
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spinlock_t msi_lock;
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/* Domain for flush queue callback; NULL if flush queue not in use */
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struct iommu_domain *fq_domain;
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};
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static inline size_t cookie_msi_granule(struct iommu_dma_cookie *cookie)
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{
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if (cookie->type == IOMMU_DMA_IOVA_COOKIE)
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return cookie->iovad.granule;
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return PAGE_SIZE;
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}
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static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
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{
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struct iommu_dma_cookie *cookie;
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cookie = kzalloc(sizeof(*cookie), GFP_KERNEL);
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if (cookie) {
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spin_lock_init(&cookie->msi_lock);
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INIT_LIST_HEAD(&cookie->msi_page_list);
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cookie->type = type;
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}
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return cookie;
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}
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/**
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* iommu_get_dma_cookie - Acquire DMA-API resources for a domain
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* @domain: IOMMU domain to prepare for DMA-API usage
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*
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* IOMMU drivers should normally call this from their domain_alloc
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* callback when domain->type == IOMMU_DOMAIN_DMA.
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*/
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int iommu_get_dma_cookie(struct iommu_domain *domain)
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{
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if (domain->iova_cookie)
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return -EEXIST;
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domain->iova_cookie = cookie_alloc(IOMMU_DMA_IOVA_COOKIE);
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if (!domain->iova_cookie)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL(iommu_get_dma_cookie);
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/**
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* iommu_get_msi_cookie - Acquire just MSI remapping resources
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* @domain: IOMMU domain to prepare
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* @base: Start address of IOVA region for MSI mappings
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*
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* Users who manage their own IOVA allocation and do not want DMA API support,
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* but would still like to take advantage of automatic MSI remapping, can use
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* this to initialise their own domain appropriately. Users should reserve a
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* contiguous IOVA region, starting at @base, large enough to accommodate the
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* number of PAGE_SIZE mappings necessary to cover every MSI doorbell address
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* used by the devices attached to @domain.
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*/
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int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
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{
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struct iommu_dma_cookie *cookie;
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if (domain->type != IOMMU_DOMAIN_UNMANAGED)
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return -EINVAL;
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if (domain->iova_cookie)
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return -EEXIST;
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cookie = cookie_alloc(IOMMU_DMA_MSI_COOKIE);
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if (!cookie)
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return -ENOMEM;
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cookie->msi_iova = base;
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domain->iova_cookie = cookie;
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return 0;
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}
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EXPORT_SYMBOL(iommu_get_msi_cookie);
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/**
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* iommu_put_dma_cookie - Release a domain's DMA mapping resources
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* @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() or
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* iommu_get_msi_cookie()
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*
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* IOMMU drivers should normally call this from their domain_free callback.
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*/
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void iommu_put_dma_cookie(struct iommu_domain *domain)
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{
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struct iommu_dma_cookie *cookie = domain->iova_cookie;
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struct iommu_dma_msi_page *msi, *tmp;
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if (!cookie)
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return;
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if (cookie->type == IOMMU_DMA_IOVA_COOKIE && cookie->iovad.granule)
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put_iova_domain(&cookie->iovad);
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list_for_each_entry_safe(msi, tmp, &cookie->msi_page_list, list) {
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list_del(&msi->list);
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kfree(msi);
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}
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kfree(cookie);
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domain->iova_cookie = NULL;
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}
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EXPORT_SYMBOL(iommu_put_dma_cookie);
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/**
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* iommu_dma_get_resv_regions - Reserved region driver helper
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* @dev: Device from iommu_get_resv_regions()
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* @list: Reserved region list from iommu_get_resv_regions()
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*
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* IOMMU drivers can use this to implement their .get_resv_regions callback
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* for general non-IOMMU-specific reservations. Currently, this covers GICv3
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* ITS region reservation on ACPI based ARM platforms that may require HW MSI
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* reservation.
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*/
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void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
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{
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if (!is_of_node(dev_iommu_fwspec_get(dev)->iommu_fwnode))
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iort_iommu_msi_get_resv_regions(dev, list);
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}
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EXPORT_SYMBOL(iommu_dma_get_resv_regions);
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static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie,
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phys_addr_t start, phys_addr_t end)
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{
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struct iova_domain *iovad = &cookie->iovad;
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struct iommu_dma_msi_page *msi_page;
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int i, num_pages;
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start -= iova_offset(iovad, start);
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num_pages = iova_align(iovad, end - start) >> iova_shift(iovad);
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msi_page = kcalloc(num_pages, sizeof(*msi_page), GFP_KERNEL);
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if (!msi_page)
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return -ENOMEM;
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for (i = 0; i < num_pages; i++) {
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msi_page[i].phys = start;
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msi_page[i].iova = start;
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INIT_LIST_HEAD(&msi_page[i].list);
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list_add(&msi_page[i].list, &cookie->msi_page_list);
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start += iovad->granule;
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}
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return 0;
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}
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static int iova_reserve_pci_windows(struct pci_dev *dev,
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struct iova_domain *iovad)
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{
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struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus);
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struct resource_entry *window;
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unsigned long lo, hi;
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phys_addr_t start = 0, end;
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resource_list_for_each_entry(window, &bridge->windows) {
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if (resource_type(window->res) != IORESOURCE_MEM)
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continue;
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lo = iova_pfn(iovad, window->res->start - window->offset);
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hi = iova_pfn(iovad, window->res->end - window->offset);
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reserve_iova(iovad, lo, hi);
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}
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/* Get reserved DMA windows from host bridge */
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resource_list_for_each_entry(window, &bridge->dma_ranges) {
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end = window->res->start - window->offset;
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resv_iova:
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if (end > start) {
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lo = iova_pfn(iovad, start);
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hi = iova_pfn(iovad, end);
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reserve_iova(iovad, lo, hi);
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} else {
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/* dma_ranges list should be sorted */
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dev_err(&dev->dev, "Failed to reserve IOVA\n");
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return -EINVAL;
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}
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start = window->res->end - window->offset + 1;
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/* If window is last entry */
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if (window->node.next == &bridge->dma_ranges &&
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end != ~(phys_addr_t)0) {
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end = ~(phys_addr_t)0;
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goto resv_iova;
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}
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}
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return 0;
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}
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static int iova_reserve_iommu_regions(struct device *dev,
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struct iommu_domain *domain)
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{
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struct iommu_dma_cookie *cookie = domain->iova_cookie;
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struct iova_domain *iovad = &cookie->iovad;
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struct iommu_resv_region *region;
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LIST_HEAD(resv_regions);
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int ret = 0;
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if (dev_is_pci(dev)) {
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ret = iova_reserve_pci_windows(to_pci_dev(dev), iovad);
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if (ret)
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return ret;
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}
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iommu_get_resv_regions(dev, &resv_regions);
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list_for_each_entry(region, &resv_regions, list) {
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unsigned long lo, hi;
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/* We ARE the software that manages these! */
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if (region->type == IOMMU_RESV_SW_MSI)
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continue;
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lo = iova_pfn(iovad, region->start);
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hi = iova_pfn(iovad, region->start + region->length - 1);
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reserve_iova(iovad, lo, hi);
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if (region->type == IOMMU_RESV_MSI)
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ret = cookie_init_hw_msi_region(cookie, region->start,
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region->start + region->length);
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if (ret)
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break;
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}
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iommu_put_resv_regions(dev, &resv_regions);
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return ret;
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}
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static void iommu_dma_flush_iotlb_all(struct iova_domain *iovad)
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{
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struct iommu_dma_cookie *cookie;
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struct iommu_domain *domain;
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cookie = container_of(iovad, struct iommu_dma_cookie, iovad);
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domain = cookie->fq_domain;
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/*
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* The IOMMU driver supporting DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE
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* implies that ops->flush_iotlb_all must be non-NULL.
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*/
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domain->ops->flush_iotlb_all(domain);
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}
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/**
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* iommu_dma_init_domain - Initialise a DMA mapping domain
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* @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
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* @base: IOVA at which the mappable address space starts
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* @size: Size of IOVA space
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* @dev: Device the domain is being initialised for
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*
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* @base and @size should be exact multiples of IOMMU page granularity to
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* avoid rounding surprises. If necessary, we reserve the page at address 0
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* to ensure it is an invalid IOVA. It is safe to reinitialise a domain, but
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* any change which could make prior IOVAs invalid will fail.
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*/
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static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
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u64 size, struct device *dev)
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{
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struct iommu_dma_cookie *cookie = domain->iova_cookie;
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struct iova_domain *iovad = &cookie->iovad;
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unsigned long order, base_pfn;
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int attr;
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if (!cookie || cookie->type != IOMMU_DMA_IOVA_COOKIE)
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return -EINVAL;
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/* Use the smallest supported page size for IOVA granularity */
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order = __ffs(domain->pgsize_bitmap);
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base_pfn = max_t(unsigned long, 1, base >> order);
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/* Check the domain allows at least some access to the device... */
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if (domain->geometry.force_aperture) {
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if (base > domain->geometry.aperture_end ||
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base + size <= domain->geometry.aperture_start) {
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pr_warn("specified DMA range outside IOMMU capability\n");
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return -EFAULT;
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}
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/* ...then finally give it a kicking to make sure it fits */
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base_pfn = max_t(unsigned long, base_pfn,
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domain->geometry.aperture_start >> order);
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}
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/* start_pfn is always nonzero for an already-initialised domain */
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if (iovad->start_pfn) {
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if (1UL << order != iovad->granule ||
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base_pfn != iovad->start_pfn) {
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pr_warn("Incompatible range for DMA domain\n");
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return -EFAULT;
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}
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return 0;
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}
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init_iova_domain(iovad, 1UL << order, base_pfn);
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if (!cookie->fq_domain && !iommu_domain_get_attr(domain,
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DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, &attr) && attr) {
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cookie->fq_domain = domain;
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init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, NULL);
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}
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if (!dev)
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return 0;
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return iova_reserve_iommu_regions(dev, domain);
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}
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/**
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* dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API
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* page flags.
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* @dir: Direction of DMA transfer
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* @coherent: Is the DMA master cache-coherent?
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* @attrs: DMA attributes for the mapping
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*
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* Return: corresponding IOMMU API page protection flags
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*/
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static int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
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unsigned long attrs)
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{
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int prot = coherent ? IOMMU_CACHE : 0;
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if (attrs & DMA_ATTR_PRIVILEGED)
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prot |= IOMMU_PRIV;
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switch (dir) {
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case DMA_BIDIRECTIONAL:
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return prot | IOMMU_READ | IOMMU_WRITE;
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case DMA_TO_DEVICE:
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return prot | IOMMU_READ;
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case DMA_FROM_DEVICE:
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return prot | IOMMU_WRITE;
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default:
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return 0;
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}
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}
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static dma_addr_t iommu_dma_alloc_iova(struct iommu_domain *domain,
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size_t size, dma_addr_t dma_limit, struct device *dev)
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{
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struct iommu_dma_cookie *cookie = domain->iova_cookie;
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struct iova_domain *iovad = &cookie->iovad;
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unsigned long shift, iova_len, iova = 0;
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if (cookie->type == IOMMU_DMA_MSI_COOKIE) {
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cookie->msi_iova += size;
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return cookie->msi_iova - size;
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}
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shift = iova_shift(iovad);
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iova_len = size >> shift;
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/*
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* Freeing non-power-of-two-sized allocations back into the IOVA caches
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* will come back to bite us badly, so we have to waste a bit of space
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* rounding up anything cacheable to make sure that can't happen. The
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* order of the unadjusted size will still match upon freeing.
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*/
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if (iova_len < (1 << (IOVA_RANGE_CACHE_MAX_SIZE - 1)))
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iova_len = roundup_pow_of_two(iova_len);
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if (dev->bus_dma_mask)
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dma_limit &= dev->bus_dma_mask;
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if (domain->geometry.force_aperture)
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dma_limit = min(dma_limit, domain->geometry.aperture_end);
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/* Try to get PCI devices a SAC address */
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if (dma_limit > DMA_BIT_MASK(32) && dev_is_pci(dev))
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iova = alloc_iova_fast(iovad, iova_len,
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DMA_BIT_MASK(32) >> shift, false);
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if (!iova)
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iova = alloc_iova_fast(iovad, iova_len, dma_limit >> shift,
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true);
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return (dma_addr_t)iova << shift;
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}
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static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
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dma_addr_t iova, size_t size)
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{
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struct iova_domain *iovad = &cookie->iovad;
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/* The MSI case is only ever cleaning up its most recent allocation */
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if (cookie->type == IOMMU_DMA_MSI_COOKIE)
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cookie->msi_iova -= size;
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else if (cookie->fq_domain) /* non-strict mode */
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queue_iova(iovad, iova_pfn(iovad, iova),
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size >> iova_shift(iovad), 0);
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else
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free_iova_fast(iovad, iova_pfn(iovad, iova),
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size >> iova_shift(iovad));
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}
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static void __iommu_dma_unmap(struct device *dev, dma_addr_t dma_addr,
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size_t size)
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{
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struct iommu_domain *domain = iommu_get_dma_domain(dev);
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struct iommu_dma_cookie *cookie = domain->iova_cookie;
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struct iova_domain *iovad = &cookie->iovad;
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size_t iova_off = iova_offset(iovad, dma_addr);
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struct iommu_iotlb_gather iotlb_gather;
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size_t unmapped;
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dma_addr -= iova_off;
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size = iova_align(iovad, size + iova_off);
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iommu_iotlb_gather_init(&iotlb_gather);
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unmapped = iommu_unmap_fast(domain, dma_addr, size, &iotlb_gather);
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WARN_ON(unmapped != size);
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if (!cookie->fq_domain)
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iommu_tlb_sync(domain, &iotlb_gather);
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iommu_dma_free_iova(cookie, dma_addr, size);
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}
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static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
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size_t size, int prot)
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{
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struct iommu_domain *domain = iommu_get_dma_domain(dev);
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struct iommu_dma_cookie *cookie = domain->iova_cookie;
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size_t iova_off = 0;
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dma_addr_t iova;
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if (cookie->type == IOMMU_DMA_IOVA_COOKIE) {
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iova_off = iova_offset(&cookie->iovad, phys);
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size = iova_align(&cookie->iovad, size + iova_off);
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}
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iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
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if (!iova)
|
|
return DMA_MAPPING_ERROR;
|
|
|
|
if (iommu_map(domain, iova, phys - iova_off, size, prot)) {
|
|
iommu_dma_free_iova(cookie, iova, size);
|
|
return DMA_MAPPING_ERROR;
|
|
}
|
|
return iova + iova_off;
|
|
}
|
|
|
|
static void __iommu_dma_free_pages(struct page **pages, int count)
|
|
{
|
|
while (count--)
|
|
__free_page(pages[count]);
|
|
kvfree(pages);
|
|
}
|
|
|
|
static struct page **__iommu_dma_alloc_pages(struct device *dev,
|
|
unsigned int count, unsigned long order_mask, gfp_t gfp)
|
|
{
|
|
struct page **pages;
|
|
unsigned int i = 0, nid = dev_to_node(dev);
|
|
|
|
order_mask &= (2U << MAX_ORDER) - 1;
|
|
if (!order_mask)
|
|
return NULL;
|
|
|
|
pages = kvzalloc(count * sizeof(*pages), GFP_KERNEL);
|
|
if (!pages)
|
|
return NULL;
|
|
|
|
/* IOMMU can map any pages, so himem can also be used here */
|
|
gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
|
|
|
|
while (count) {
|
|
struct page *page = NULL;
|
|
unsigned int order_size;
|
|
|
|
/*
|
|
* Higher-order allocations are a convenience rather
|
|
* than a necessity, hence using __GFP_NORETRY until
|
|
* falling back to minimum-order allocations.
|
|
*/
|
|
for (order_mask &= (2U << __fls(count)) - 1;
|
|
order_mask; order_mask &= ~order_size) {
|
|
unsigned int order = __fls(order_mask);
|
|
gfp_t alloc_flags = gfp;
|
|
|
|
order_size = 1U << order;
|
|
if (order_mask > order_size)
|
|
alloc_flags |= __GFP_NORETRY;
|
|
page = alloc_pages_node(nid, alloc_flags, order);
|
|
if (!page)
|
|
continue;
|
|
if (!order)
|
|
break;
|
|
if (!PageCompound(page)) {
|
|
split_page(page, order);
|
|
break;
|
|
} else if (!split_huge_page(page)) {
|
|
break;
|
|
}
|
|
__free_pages(page, order);
|
|
}
|
|
if (!page) {
|
|
__iommu_dma_free_pages(pages, i);
|
|
return NULL;
|
|
}
|
|
count -= order_size;
|
|
while (order_size--)
|
|
pages[i++] = page++;
|
|
}
|
|
return pages;
|
|
}
|
|
|
|
static struct page **__iommu_dma_get_pages(void *cpu_addr)
|
|
{
|
|
struct vm_struct *area = find_vm_area(cpu_addr);
|
|
|
|
if (!area || !area->pages)
|
|
return NULL;
|
|
return area->pages;
|
|
}
|
|
|
|
/**
|
|
* iommu_dma_alloc_remap - Allocate and map a buffer contiguous in IOVA space
|
|
* @dev: Device to allocate memory for. Must be a real device
|
|
* attached to an iommu_dma_domain
|
|
* @size: Size of buffer in bytes
|
|
* @dma_handle: Out argument for allocated DMA handle
|
|
* @gfp: Allocation flags
|
|
* @attrs: DMA attributes for this allocation
|
|
*
|
|
* If @size is less than PAGE_SIZE, then a full CPU page will be allocated,
|
|
* but an IOMMU which supports smaller pages might not map the whole thing.
|
|
*
|
|
* Return: Mapped virtual address, or NULL on failure.
|
|
*/
|
|
static void *iommu_dma_alloc_remap(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
|
|
{
|
|
struct iommu_domain *domain = iommu_get_dma_domain(dev);
|
|
struct iommu_dma_cookie *cookie = domain->iova_cookie;
|
|
struct iova_domain *iovad = &cookie->iovad;
|
|
bool coherent = dev_is_dma_coherent(dev);
|
|
int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
|
|
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
|
|
unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap;
|
|
struct page **pages;
|
|
struct sg_table sgt;
|
|
dma_addr_t iova;
|
|
void *vaddr;
|
|
|
|
*dma_handle = DMA_MAPPING_ERROR;
|
|
|
|
min_size = alloc_sizes & -alloc_sizes;
|
|
if (min_size < PAGE_SIZE) {
|
|
min_size = PAGE_SIZE;
|
|
alloc_sizes |= PAGE_SIZE;
|
|
} else {
|
|
size = ALIGN(size, min_size);
|
|
}
|
|
if (attrs & DMA_ATTR_ALLOC_SINGLE_PAGES)
|
|
alloc_sizes = min_size;
|
|
|
|
count = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
|
pages = __iommu_dma_alloc_pages(dev, count, alloc_sizes >> PAGE_SHIFT,
|
|
gfp);
|
|
if (!pages)
|
|
return NULL;
|
|
|
|
size = iova_align(iovad, size);
|
|
iova = iommu_dma_alloc_iova(domain, size, dev->coherent_dma_mask, dev);
|
|
if (!iova)
|
|
goto out_free_pages;
|
|
|
|
if (sg_alloc_table_from_pages(&sgt, pages, count, 0, size, GFP_KERNEL))
|
|
goto out_free_iova;
|
|
|
|
if (!(ioprot & IOMMU_CACHE)) {
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgt.sgl, sg, sgt.orig_nents, i)
|
|
arch_dma_prep_coherent(sg_page(sg), sg->length);
|
|
}
|
|
|
|
if (iommu_map_sg(domain, iova, sgt.sgl, sgt.orig_nents, ioprot)
|
|
< size)
|
|
goto out_free_sg;
|
|
|
|
vaddr = dma_common_pages_remap(pages, size, VM_USERMAP, prot,
|
|
__builtin_return_address(0));
|
|
if (!vaddr)
|
|
goto out_unmap;
|
|
|
|
*dma_handle = iova;
|
|
sg_free_table(&sgt);
|
|
return vaddr;
|
|
|
|
out_unmap:
|
|
__iommu_dma_unmap(dev, iova, size);
|
|
out_free_sg:
|
|
sg_free_table(&sgt);
|
|
out_free_iova:
|
|
iommu_dma_free_iova(cookie, iova, size);
|
|
out_free_pages:
|
|
__iommu_dma_free_pages(pages, count);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __iommu_dma_mmap - Map a buffer into provided user VMA
|
|
* @pages: Array representing buffer from __iommu_dma_alloc()
|
|
* @size: Size of buffer in bytes
|
|
* @vma: VMA describing requested userspace mapping
|
|
*
|
|
* Maps the pages of the buffer in @pages into @vma. The caller is responsible
|
|
* for verifying the correct size and protection of @vma beforehand.
|
|
*/
|
|
static int __iommu_dma_mmap(struct page **pages, size_t size,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return vm_map_pages(vma, pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
|
|
}
|
|
|
|
static void iommu_dma_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
|
|
{
|
|
phys_addr_t phys;
|
|
|
|
if (dev_is_dma_coherent(dev))
|
|
return;
|
|
|
|
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
|
|
arch_sync_dma_for_cpu(dev, phys, size, dir);
|
|
}
|
|
|
|
static void iommu_dma_sync_single_for_device(struct device *dev,
|
|
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
|
|
{
|
|
phys_addr_t phys;
|
|
|
|
if (dev_is_dma_coherent(dev))
|
|
return;
|
|
|
|
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
|
|
arch_sync_dma_for_device(dev, phys, size, dir);
|
|
}
|
|
|
|
static void iommu_dma_sync_sg_for_cpu(struct device *dev,
|
|
struct scatterlist *sgl, int nelems,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
if (dev_is_dma_coherent(dev))
|
|
return;
|
|
|
|
for_each_sg(sgl, sg, nelems, i)
|
|
arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
|
|
}
|
|
|
|
static void iommu_dma_sync_sg_for_device(struct device *dev,
|
|
struct scatterlist *sgl, int nelems,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
if (dev_is_dma_coherent(dev))
|
|
return;
|
|
|
|
for_each_sg(sgl, sg, nelems, i)
|
|
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
|
|
}
|
|
|
|
static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
phys_addr_t phys = page_to_phys(page) + offset;
|
|
bool coherent = dev_is_dma_coherent(dev);
|
|
int prot = dma_info_to_prot(dir, coherent, attrs);
|
|
dma_addr_t dma_handle;
|
|
|
|
dma_handle =__iommu_dma_map(dev, phys, size, prot);
|
|
if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
|
|
dma_handle != DMA_MAPPING_ERROR)
|
|
arch_sync_dma_for_device(dev, phys, size, dir);
|
|
return dma_handle;
|
|
}
|
|
|
|
static void iommu_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
|
|
size_t size, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
iommu_dma_sync_single_for_cpu(dev, dma_handle, size, dir);
|
|
__iommu_dma_unmap(dev, dma_handle, size);
|
|
}
|
|
|
|
/*
|
|
* Prepare a successfully-mapped scatterlist to give back to the caller.
|
|
*
|
|
* At this point the segments are already laid out by iommu_dma_map_sg() to
|
|
* avoid individually crossing any boundaries, so we merely need to check a
|
|
* segment's start address to avoid concatenating across one.
|
|
*/
|
|
static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents,
|
|
dma_addr_t dma_addr)
|
|
{
|
|
struct scatterlist *s, *cur = sg;
|
|
unsigned long seg_mask = dma_get_seg_boundary(dev);
|
|
unsigned int cur_len = 0, max_len = dma_get_max_seg_size(dev);
|
|
int i, count = 0;
|
|
|
|
for_each_sg(sg, s, nents, i) {
|
|
/* Restore this segment's original unaligned fields first */
|
|
unsigned int s_iova_off = sg_dma_address(s);
|
|
unsigned int s_length = sg_dma_len(s);
|
|
unsigned int s_iova_len = s->length;
|
|
|
|
s->offset += s_iova_off;
|
|
s->length = s_length;
|
|
sg_dma_address(s) = DMA_MAPPING_ERROR;
|
|
sg_dma_len(s) = 0;
|
|
|
|
/*
|
|
* Now fill in the real DMA data. If...
|
|
* - there is a valid output segment to append to
|
|
* - and this segment starts on an IOVA page boundary
|
|
* - but doesn't fall at a segment boundary
|
|
* - and wouldn't make the resulting output segment too long
|
|
*/
|
|
if (cur_len && !s_iova_off && (dma_addr & seg_mask) &&
|
|
(cur_len + s_length <= max_len)) {
|
|
/* ...then concatenate it with the previous one */
|
|
cur_len += s_length;
|
|
} else {
|
|
/* Otherwise start the next output segment */
|
|
if (i > 0)
|
|
cur = sg_next(cur);
|
|
cur_len = s_length;
|
|
count++;
|
|
|
|
sg_dma_address(cur) = dma_addr + s_iova_off;
|
|
}
|
|
|
|
sg_dma_len(cur) = cur_len;
|
|
dma_addr += s_iova_len;
|
|
|
|
if (s_length + s_iova_off < s_iova_len)
|
|
cur_len = 0;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* If mapping failed, then just restore the original list,
|
|
* but making sure the DMA fields are invalidated.
|
|
*/
|
|
static void __invalidate_sg(struct scatterlist *sg, int nents)
|
|
{
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
for_each_sg(sg, s, nents, i) {
|
|
if (sg_dma_address(s) != DMA_MAPPING_ERROR)
|
|
s->offset += sg_dma_address(s);
|
|
if (sg_dma_len(s))
|
|
s->length = sg_dma_len(s);
|
|
sg_dma_address(s) = DMA_MAPPING_ERROR;
|
|
sg_dma_len(s) = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The DMA API client is passing in a scatterlist which could describe
|
|
* any old buffer layout, but the IOMMU API requires everything to be
|
|
* aligned to IOMMU pages. Hence the need for this complicated bit of
|
|
* impedance-matching, to be able to hand off a suitably-aligned list,
|
|
* but still preserve the original offsets and sizes for the caller.
|
|
*/
|
|
static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
struct iommu_domain *domain = iommu_get_dma_domain(dev);
|
|
struct iommu_dma_cookie *cookie = domain->iova_cookie;
|
|
struct iova_domain *iovad = &cookie->iovad;
|
|
struct scatterlist *s, *prev = NULL;
|
|
int prot = dma_info_to_prot(dir, dev_is_dma_coherent(dev), attrs);
|
|
dma_addr_t iova;
|
|
size_t iova_len = 0;
|
|
unsigned long mask = dma_get_seg_boundary(dev);
|
|
int i;
|
|
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
iommu_dma_sync_sg_for_device(dev, sg, nents, dir);
|
|
|
|
/*
|
|
* Work out how much IOVA space we need, and align the segments to
|
|
* IOVA granules for the IOMMU driver to handle. With some clever
|
|
* trickery we can modify the list in-place, but reversibly, by
|
|
* stashing the unaligned parts in the as-yet-unused DMA fields.
|
|
*/
|
|
for_each_sg(sg, s, nents, i) {
|
|
size_t s_iova_off = iova_offset(iovad, s->offset);
|
|
size_t s_length = s->length;
|
|
size_t pad_len = (mask - iova_len + 1) & mask;
|
|
|
|
sg_dma_address(s) = s_iova_off;
|
|
sg_dma_len(s) = s_length;
|
|
s->offset -= s_iova_off;
|
|
s_length = iova_align(iovad, s_length + s_iova_off);
|
|
s->length = s_length;
|
|
|
|
/*
|
|
* Due to the alignment of our single IOVA allocation, we can
|
|
* depend on these assumptions about the segment boundary mask:
|
|
* - If mask size >= IOVA size, then the IOVA range cannot
|
|
* possibly fall across a boundary, so we don't care.
|
|
* - If mask size < IOVA size, then the IOVA range must start
|
|
* exactly on a boundary, therefore we can lay things out
|
|
* based purely on segment lengths without needing to know
|
|
* the actual addresses beforehand.
|
|
* - The mask must be a power of 2, so pad_len == 0 if
|
|
* iova_len == 0, thus we cannot dereference prev the first
|
|
* time through here (i.e. before it has a meaningful value).
|
|
*/
|
|
if (pad_len && pad_len < s_length - 1) {
|
|
prev->length += pad_len;
|
|
iova_len += pad_len;
|
|
}
|
|
|
|
iova_len += s_length;
|
|
prev = s;
|
|
}
|
|
|
|
iova = iommu_dma_alloc_iova(domain, iova_len, dma_get_mask(dev), dev);
|
|
if (!iova)
|
|
goto out_restore_sg;
|
|
|
|
/*
|
|
* We'll leave any physical concatenation to the IOMMU driver's
|
|
* implementation - it knows better than we do.
|
|
*/
|
|
if (iommu_map_sg(domain, iova, sg, nents, prot) < iova_len)
|
|
goto out_free_iova;
|
|
|
|
return __finalise_sg(dev, sg, nents, iova);
|
|
|
|
out_free_iova:
|
|
iommu_dma_free_iova(cookie, iova, iova_len);
|
|
out_restore_sg:
|
|
__invalidate_sg(sg, nents);
|
|
return 0;
|
|
}
|
|
|
|
static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
dma_addr_t start, end;
|
|
struct scatterlist *tmp;
|
|
int i;
|
|
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
iommu_dma_sync_sg_for_cpu(dev, sg, nents, dir);
|
|
|
|
/*
|
|
* The scatterlist segments are mapped into a single
|
|
* contiguous IOVA allocation, so this is incredibly easy.
|
|
*/
|
|
start = sg_dma_address(sg);
|
|
for_each_sg(sg_next(sg), tmp, nents - 1, i) {
|
|
if (sg_dma_len(tmp) == 0)
|
|
break;
|
|
sg = tmp;
|
|
}
|
|
end = sg_dma_address(sg) + sg_dma_len(sg);
|
|
__iommu_dma_unmap(dev, start, end - start);
|
|
}
|
|
|
|
static dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
|
|
size_t size, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
return __iommu_dma_map(dev, phys, size,
|
|
dma_info_to_prot(dir, false, attrs) | IOMMU_MMIO);
|
|
}
|
|
|
|
static void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
|
|
size_t size, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
__iommu_dma_unmap(dev, handle, size);
|
|
}
|
|
|
|
static void __iommu_dma_free(struct device *dev, size_t size, void *cpu_addr)
|
|
{
|
|
size_t alloc_size = PAGE_ALIGN(size);
|
|
int count = alloc_size >> PAGE_SHIFT;
|
|
struct page *page = NULL, **pages = NULL;
|
|
|
|
/* Non-coherent atomic allocation? Easy */
|
|
if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
|
|
dma_free_from_pool(cpu_addr, alloc_size))
|
|
return;
|
|
|
|
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
|
|
/*
|
|
* If it the address is remapped, then it's either non-coherent
|
|
* or highmem CMA, or an iommu_dma_alloc_remap() construction.
|
|
*/
|
|
pages = __iommu_dma_get_pages(cpu_addr);
|
|
if (!pages)
|
|
page = vmalloc_to_page(cpu_addr);
|
|
dma_common_free_remap(cpu_addr, alloc_size, VM_USERMAP);
|
|
} else {
|
|
/* Lowmem means a coherent atomic or CMA allocation */
|
|
page = virt_to_page(cpu_addr);
|
|
}
|
|
|
|
if (pages)
|
|
__iommu_dma_free_pages(pages, count);
|
|
if (page)
|
|
dma_free_contiguous(dev, page, alloc_size);
|
|
}
|
|
|
|
static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
|
|
dma_addr_t handle, unsigned long attrs)
|
|
{
|
|
__iommu_dma_unmap(dev, handle, size);
|
|
__iommu_dma_free(dev, size, cpu_addr);
|
|
}
|
|
|
|
static void *iommu_dma_alloc_pages(struct device *dev, size_t size,
|
|
struct page **pagep, gfp_t gfp, unsigned long attrs)
|
|
{
|
|
bool coherent = dev_is_dma_coherent(dev);
|
|
size_t alloc_size = PAGE_ALIGN(size);
|
|
struct page *page = NULL;
|
|
void *cpu_addr;
|
|
|
|
page = dma_alloc_contiguous(dev, alloc_size, gfp);
|
|
if (!page)
|
|
return NULL;
|
|
|
|
if (IS_ENABLED(CONFIG_DMA_REMAP) && (!coherent || PageHighMem(page))) {
|
|
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
|
|
|
|
cpu_addr = dma_common_contiguous_remap(page, alloc_size,
|
|
VM_USERMAP, prot, __builtin_return_address(0));
|
|
if (!cpu_addr)
|
|
goto out_free_pages;
|
|
|
|
if (!coherent)
|
|
arch_dma_prep_coherent(page, size);
|
|
} else {
|
|
cpu_addr = page_address(page);
|
|
}
|
|
|
|
*pagep = page;
|
|
memset(cpu_addr, 0, alloc_size);
|
|
return cpu_addr;
|
|
out_free_pages:
|
|
dma_free_contiguous(dev, page, alloc_size);
|
|
return NULL;
|
|
}
|
|
|
|
static void *iommu_dma_alloc(struct device *dev, size_t size,
|
|
dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
|
|
{
|
|
bool coherent = dev_is_dma_coherent(dev);
|
|
int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
|
|
struct page *page = NULL;
|
|
void *cpu_addr;
|
|
|
|
gfp |= __GFP_ZERO;
|
|
|
|
if (IS_ENABLED(CONFIG_DMA_REMAP) && gfpflags_allow_blocking(gfp) &&
|
|
!(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
|
|
return iommu_dma_alloc_remap(dev, size, handle, gfp, attrs);
|
|
|
|
if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
|
|
!gfpflags_allow_blocking(gfp) && !coherent)
|
|
cpu_addr = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp);
|
|
else
|
|
cpu_addr = iommu_dma_alloc_pages(dev, size, &page, gfp, attrs);
|
|
if (!cpu_addr)
|
|
return NULL;
|
|
|
|
*handle = __iommu_dma_map(dev, page_to_phys(page), size, ioprot);
|
|
if (*handle == DMA_MAPPING_ERROR) {
|
|
__iommu_dma_free(dev, size, cpu_addr);
|
|
return NULL;
|
|
}
|
|
|
|
return cpu_addr;
|
|
}
|
|
|
|
static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
|
|
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
|
unsigned long attrs)
|
|
{
|
|
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
|
unsigned long pfn, off = vma->vm_pgoff;
|
|
int ret;
|
|
|
|
vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs);
|
|
|
|
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
|
|
return ret;
|
|
|
|
if (off >= nr_pages || vma_pages(vma) > nr_pages - off)
|
|
return -ENXIO;
|
|
|
|
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
|
|
struct page **pages = __iommu_dma_get_pages(cpu_addr);
|
|
|
|
if (pages)
|
|
return __iommu_dma_mmap(pages, size, vma);
|
|
pfn = vmalloc_to_pfn(cpu_addr);
|
|
} else {
|
|
pfn = page_to_pfn(virt_to_page(cpu_addr));
|
|
}
|
|
|
|
return remap_pfn_range(vma, vma->vm_start, pfn + off,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot);
|
|
}
|
|
|
|
static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
|
|
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
|
unsigned long attrs)
|
|
{
|
|
struct page *page;
|
|
int ret;
|
|
|
|
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
|
|
struct page **pages = __iommu_dma_get_pages(cpu_addr);
|
|
|
|
if (pages) {
|
|
return sg_alloc_table_from_pages(sgt, pages,
|
|
PAGE_ALIGN(size) >> PAGE_SHIFT,
|
|
0, size, GFP_KERNEL);
|
|
}
|
|
|
|
page = vmalloc_to_page(cpu_addr);
|
|
} else {
|
|
page = virt_to_page(cpu_addr);
|
|
}
|
|
|
|
ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
|
|
if (!ret)
|
|
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
|
|
return ret;
|
|
}
|
|
|
|
static const struct dma_map_ops iommu_dma_ops = {
|
|
.alloc = iommu_dma_alloc,
|
|
.free = iommu_dma_free,
|
|
.mmap = iommu_dma_mmap,
|
|
.get_sgtable = iommu_dma_get_sgtable,
|
|
.map_page = iommu_dma_map_page,
|
|
.unmap_page = iommu_dma_unmap_page,
|
|
.map_sg = iommu_dma_map_sg,
|
|
.unmap_sg = iommu_dma_unmap_sg,
|
|
.sync_single_for_cpu = iommu_dma_sync_single_for_cpu,
|
|
.sync_single_for_device = iommu_dma_sync_single_for_device,
|
|
.sync_sg_for_cpu = iommu_dma_sync_sg_for_cpu,
|
|
.sync_sg_for_device = iommu_dma_sync_sg_for_device,
|
|
.map_resource = iommu_dma_map_resource,
|
|
.unmap_resource = iommu_dma_unmap_resource,
|
|
};
|
|
|
|
/*
|
|
* The IOMMU core code allocates the default DMA domain, which the underlying
|
|
* IOMMU driver needs to support via the dma-iommu layer.
|
|
*/
|
|
void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size)
|
|
{
|
|
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
|
|
|
|
if (!domain)
|
|
goto out_err;
|
|
|
|
/*
|
|
* The IOMMU core code allocates the default DMA domain, which the
|
|
* underlying IOMMU driver needs to support via the dma-iommu layer.
|
|
*/
|
|
if (domain->type == IOMMU_DOMAIN_DMA) {
|
|
if (iommu_dma_init_domain(domain, dma_base, size, dev))
|
|
goto out_err;
|
|
dev->dma_ops = &iommu_dma_ops;
|
|
}
|
|
|
|
return;
|
|
out_err:
|
|
pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
|
|
dev_name(dev));
|
|
}
|
|
|
|
static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
|
|
phys_addr_t msi_addr, struct iommu_domain *domain)
|
|
{
|
|
struct iommu_dma_cookie *cookie = domain->iova_cookie;
|
|
struct iommu_dma_msi_page *msi_page;
|
|
dma_addr_t iova;
|
|
int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
|
|
size_t size = cookie_msi_granule(cookie);
|
|
|
|
msi_addr &= ~(phys_addr_t)(size - 1);
|
|
list_for_each_entry(msi_page, &cookie->msi_page_list, list)
|
|
if (msi_page->phys == msi_addr)
|
|
return msi_page;
|
|
|
|
msi_page = kzalloc(sizeof(*msi_page), GFP_ATOMIC);
|
|
if (!msi_page)
|
|
return NULL;
|
|
|
|
iova = __iommu_dma_map(dev, msi_addr, size, prot);
|
|
if (iova == DMA_MAPPING_ERROR)
|
|
goto out_free_page;
|
|
|
|
INIT_LIST_HEAD(&msi_page->list);
|
|
msi_page->phys = msi_addr;
|
|
msi_page->iova = iova;
|
|
list_add(&msi_page->list, &cookie->msi_page_list);
|
|
return msi_page;
|
|
|
|
out_free_page:
|
|
kfree(msi_page);
|
|
return NULL;
|
|
}
|
|
|
|
int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr)
|
|
{
|
|
struct device *dev = msi_desc_to_dev(desc);
|
|
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
|
|
struct iommu_dma_cookie *cookie;
|
|
struct iommu_dma_msi_page *msi_page;
|
|
unsigned long flags;
|
|
|
|
if (!domain || !domain->iova_cookie) {
|
|
desc->iommu_cookie = NULL;
|
|
return 0;
|
|
}
|
|
|
|
cookie = domain->iova_cookie;
|
|
|
|
/*
|
|
* We disable IRQs to rule out a possible inversion against
|
|
* irq_desc_lock if, say, someone tries to retarget the affinity
|
|
* of an MSI from within an IPI handler.
|
|
*/
|
|
spin_lock_irqsave(&cookie->msi_lock, flags);
|
|
msi_page = iommu_dma_get_msi_page(dev, msi_addr, domain);
|
|
spin_unlock_irqrestore(&cookie->msi_lock, flags);
|
|
|
|
msi_desc_set_iommu_cookie(desc, msi_page);
|
|
|
|
if (!msi_page)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void iommu_dma_compose_msi_msg(struct msi_desc *desc,
|
|
struct msi_msg *msg)
|
|
{
|
|
struct device *dev = msi_desc_to_dev(desc);
|
|
const struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
|
|
const struct iommu_dma_msi_page *msi_page;
|
|
|
|
msi_page = msi_desc_get_iommu_cookie(desc);
|
|
|
|
if (!domain || !domain->iova_cookie || WARN_ON(!msi_page))
|
|
return;
|
|
|
|
msg->address_hi = upper_32_bits(msi_page->iova);
|
|
msg->address_lo &= cookie_msi_granule(domain->iova_cookie) - 1;
|
|
msg->address_lo += lower_32_bits(msi_page->iova);
|
|
}
|
|
|
|
static int iommu_dma_init(void)
|
|
{
|
|
return iova_cache_get();
|
|
}
|
|
arch_initcall(iommu_dma_init);
|