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512b7931ad
Merge misc updates from Andrew Morton: "257 patches. Subsystems affected by this patch series: scripts, ocfs2, vfs, and mm (slab-generic, slab, slub, kconfig, dax, kasan, debug, pagecache, gup, swap, memcg, pagemap, mprotect, mremap, iomap, tracing, vmalloc, pagealloc, memory-failure, hugetlb, userfaultfd, vmscan, tools, memblock, oom-kill, hugetlbfs, migration, thp, readahead, nommu, ksm, vmstat, madvise, memory-hotplug, rmap, zsmalloc, highmem, zram, cleanups, kfence, and damon)" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (257 commits) mm/damon: remove return value from before_terminate callback mm/damon: fix a few spelling mistakes in comments and a pr_debug message mm/damon: simplify stop mechanism Docs/admin-guide/mm/pagemap: wordsmith page flags descriptions Docs/admin-guide/mm/damon/start: simplify the content Docs/admin-guide/mm/damon/start: fix a wrong link Docs/admin-guide/mm/damon/start: fix wrong example commands mm/damon/dbgfs: add adaptive_targets list check before enable monitor_on mm/damon: remove unnecessary variable initialization Documentation/admin-guide/mm/damon: add a document for DAMON_RECLAIM mm/damon: introduce DAMON-based Reclamation (DAMON_RECLAIM) selftests/damon: support watermarks mm/damon/dbgfs: support watermarks mm/damon/schemes: activate schemes based on a watermarks mechanism tools/selftests/damon: update for regions prioritization of schemes mm/damon/dbgfs: support prioritization weights mm/damon/vaddr,paddr: support pageout prioritization mm/damon/schemes: prioritize regions within the quotas mm/damon/selftests: support schemes quotas mm/damon/dbgfs: support quotas of schemes ...
568 lines
16 KiB
C
568 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2010
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* by Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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*
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* This code provides a IOMMU for Xen PV guests with PCI passthrough.
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*
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* PV guests under Xen are running in an non-contiguous memory architecture.
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*
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* When PCI pass-through is utilized, this necessitates an IOMMU for
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* translating bus (DMA) to virtual and vice-versa and also providing a
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* mechanism to have contiguous pages for device drivers operations (say DMA
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* operations).
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*
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* Specifically, under Xen the Linux idea of pages is an illusion. It
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* assumes that pages start at zero and go up to the available memory. To
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* help with that, the Linux Xen MMU provides a lookup mechanism to
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* translate the page frame numbers (PFN) to machine frame numbers (MFN)
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* and vice-versa. The MFN are the "real" frame numbers. Furthermore
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* memory is not contiguous. Xen hypervisor stitches memory for guests
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* from different pools, which means there is no guarantee that PFN==MFN
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* and PFN+1==MFN+1. Lastly with Xen 4.0, pages (in debug mode) are
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* allocated in descending order (high to low), meaning the guest might
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* never get any MFN's under the 4GB mark.
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*/
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#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
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#include <linux/memblock.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-map-ops.h>
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#include <linux/export.h>
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#include <xen/swiotlb-xen.h>
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#include <xen/page.h>
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#include <xen/xen-ops.h>
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#include <xen/hvc-console.h>
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#include <asm/dma-mapping.h>
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#include <asm/xen/page-coherent.h>
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#include <trace/events/swiotlb.h>
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#define MAX_DMA_BITS 32
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/*
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* Quick lookup value of the bus address of the IOTLB.
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*/
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static inline phys_addr_t xen_phys_to_bus(struct device *dev, phys_addr_t paddr)
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{
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unsigned long bfn = pfn_to_bfn(XEN_PFN_DOWN(paddr));
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phys_addr_t baddr = (phys_addr_t)bfn << XEN_PAGE_SHIFT;
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baddr |= paddr & ~XEN_PAGE_MASK;
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return baddr;
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}
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static inline dma_addr_t xen_phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return phys_to_dma(dev, xen_phys_to_bus(dev, paddr));
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}
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static inline phys_addr_t xen_bus_to_phys(struct device *dev,
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phys_addr_t baddr)
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{
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unsigned long xen_pfn = bfn_to_pfn(XEN_PFN_DOWN(baddr));
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phys_addr_t paddr = (xen_pfn << XEN_PAGE_SHIFT) |
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(baddr & ~XEN_PAGE_MASK);
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return paddr;
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}
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static inline phys_addr_t xen_dma_to_phys(struct device *dev,
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dma_addr_t dma_addr)
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{
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return xen_bus_to_phys(dev, dma_to_phys(dev, dma_addr));
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}
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static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
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{
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unsigned long next_bfn, xen_pfn = XEN_PFN_DOWN(p);
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unsigned int i, nr_pages = XEN_PFN_UP(xen_offset_in_page(p) + size);
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next_bfn = pfn_to_bfn(xen_pfn);
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for (i = 1; i < nr_pages; i++)
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if (pfn_to_bfn(++xen_pfn) != ++next_bfn)
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return 1;
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return 0;
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}
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static int is_xen_swiotlb_buffer(struct device *dev, dma_addr_t dma_addr)
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{
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unsigned long bfn = XEN_PFN_DOWN(dma_to_phys(dev, dma_addr));
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unsigned long xen_pfn = bfn_to_local_pfn(bfn);
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phys_addr_t paddr = (phys_addr_t)xen_pfn << XEN_PAGE_SHIFT;
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/* If the address is outside our domain, it CAN
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* have the same virtual address as another address
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* in our domain. Therefore _only_ check address within our domain.
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*/
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if (pfn_valid(PFN_DOWN(paddr)))
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return is_swiotlb_buffer(dev, paddr);
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return 0;
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}
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static int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
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{
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int rc;
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unsigned int order = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT);
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unsigned int i, dma_bits = order + PAGE_SHIFT;
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dma_addr_t dma_handle;
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phys_addr_t p = virt_to_phys(buf);
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BUILD_BUG_ON(IO_TLB_SEGSIZE & (IO_TLB_SEGSIZE - 1));
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BUG_ON(nslabs % IO_TLB_SEGSIZE);
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i = 0;
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do {
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do {
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rc = xen_create_contiguous_region(
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p + (i << IO_TLB_SHIFT), order,
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dma_bits, &dma_handle);
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} while (rc && dma_bits++ < MAX_DMA_BITS);
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if (rc)
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return rc;
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i += IO_TLB_SEGSIZE;
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} while (i < nslabs);
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return 0;
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}
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enum xen_swiotlb_err {
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XEN_SWIOTLB_UNKNOWN = 0,
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XEN_SWIOTLB_ENOMEM,
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XEN_SWIOTLB_EFIXUP
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};
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static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
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{
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switch (err) {
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case XEN_SWIOTLB_ENOMEM:
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return "Cannot allocate Xen-SWIOTLB buffer\n";
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case XEN_SWIOTLB_EFIXUP:
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return "Failed to get contiguous memory for DMA from Xen!\n"\
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"You either: don't have the permissions, do not have"\
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" enough free memory under 4GB, or the hypervisor memory"\
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" is too fragmented!";
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default:
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break;
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}
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return "";
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}
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int xen_swiotlb_init(void)
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{
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enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
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unsigned long bytes = swiotlb_size_or_default();
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unsigned long nslabs = bytes >> IO_TLB_SHIFT;
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unsigned int order, repeat = 3;
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int rc = -ENOMEM;
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char *start;
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if (io_tlb_default_mem.nslabs) {
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pr_warn("swiotlb buffer already initialized\n");
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return -EEXIST;
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}
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retry:
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m_ret = XEN_SWIOTLB_ENOMEM;
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order = get_order(bytes);
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/*
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* Get IO TLB memory from any location.
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*/
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#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
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#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
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while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
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start = (void *)xen_get_swiotlb_free_pages(order);
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if (start)
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break;
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order--;
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}
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if (!start)
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goto exit;
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if (order != get_order(bytes)) {
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pr_warn("Warning: only able to allocate %ld MB for software IO TLB\n",
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(PAGE_SIZE << order) >> 20);
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nslabs = SLABS_PER_PAGE << order;
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bytes = nslabs << IO_TLB_SHIFT;
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}
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/*
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* And replace that memory with pages under 4GB.
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*/
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rc = xen_swiotlb_fixup(start, nslabs);
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if (rc) {
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free_pages((unsigned long)start, order);
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m_ret = XEN_SWIOTLB_EFIXUP;
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goto error;
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}
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rc = swiotlb_late_init_with_tbl(start, nslabs);
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if (rc)
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return rc;
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swiotlb_set_max_segment(PAGE_SIZE);
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return 0;
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error:
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if (nslabs > 1024 && repeat--) {
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/* Min is 2MB */
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nslabs = max(1024UL, ALIGN(nslabs >> 1, IO_TLB_SEGSIZE));
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bytes = nslabs << IO_TLB_SHIFT;
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pr_info("Lowering to %luMB\n", bytes >> 20);
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goto retry;
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}
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exit:
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pr_err("%s (rc:%d)\n", xen_swiotlb_error(m_ret), rc);
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return rc;
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}
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#ifdef CONFIG_X86
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void __init xen_swiotlb_init_early(void)
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{
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unsigned long bytes = swiotlb_size_or_default();
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unsigned long nslabs = bytes >> IO_TLB_SHIFT;
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unsigned int repeat = 3;
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char *start;
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int rc;
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retry:
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/*
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* Get IO TLB memory from any location.
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*/
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start = memblock_alloc(PAGE_ALIGN(bytes),
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IO_TLB_SEGSIZE << IO_TLB_SHIFT);
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if (!start)
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panic("%s: Failed to allocate %lu bytes\n",
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__func__, PAGE_ALIGN(bytes));
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/*
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* And replace that memory with pages under 4GB.
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*/
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rc = xen_swiotlb_fixup(start, nslabs);
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if (rc) {
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memblock_free(start, PAGE_ALIGN(bytes));
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if (nslabs > 1024 && repeat--) {
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/* Min is 2MB */
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nslabs = max(1024UL, ALIGN(nslabs >> 1, IO_TLB_SEGSIZE));
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bytes = nslabs << IO_TLB_SHIFT;
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pr_info("Lowering to %luMB\n", bytes >> 20);
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goto retry;
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}
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panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
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}
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if (swiotlb_init_with_tbl(start, nslabs, true))
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panic("Cannot allocate SWIOTLB buffer");
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swiotlb_set_max_segment(PAGE_SIZE);
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}
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#endif /* CONFIG_X86 */
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static void *
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xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags,
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unsigned long attrs)
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{
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void *ret;
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int order = get_order(size);
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u64 dma_mask = DMA_BIT_MASK(32);
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phys_addr_t phys;
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dma_addr_t dev_addr;
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/*
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* Ignore region specifiers - the kernel's ideas of
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* pseudo-phys memory layout has nothing to do with the
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* machine physical layout. We can't allocate highmem
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* because we can't return a pointer to it.
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*/
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flags &= ~(__GFP_DMA | __GFP_HIGHMEM);
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/* Convert the size to actually allocated. */
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size = 1UL << (order + XEN_PAGE_SHIFT);
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/* On ARM this function returns an ioremap'ped virtual address for
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* which virt_to_phys doesn't return the corresponding physical
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* address. In fact on ARM virt_to_phys only works for kernel direct
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* mapped RAM memory. Also see comment below.
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*/
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ret = xen_alloc_coherent_pages(hwdev, size, dma_handle, flags, attrs);
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if (!ret)
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return ret;
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if (hwdev && hwdev->coherent_dma_mask)
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dma_mask = hwdev->coherent_dma_mask;
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/* At this point dma_handle is the dma address, next we are
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* going to set it to the machine address.
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* Do not use virt_to_phys(ret) because on ARM it doesn't correspond
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* to *dma_handle. */
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phys = dma_to_phys(hwdev, *dma_handle);
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dev_addr = xen_phys_to_dma(hwdev, phys);
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if (((dev_addr + size - 1 <= dma_mask)) &&
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!range_straddles_page_boundary(phys, size))
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*dma_handle = dev_addr;
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else {
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if (xen_create_contiguous_region(phys, order,
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fls64(dma_mask), dma_handle) != 0) {
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xen_free_coherent_pages(hwdev, size, ret, (dma_addr_t)phys, attrs);
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return NULL;
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}
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*dma_handle = phys_to_dma(hwdev, *dma_handle);
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SetPageXenRemapped(virt_to_page(ret));
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}
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memset(ret, 0, size);
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return ret;
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}
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static void
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xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
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dma_addr_t dev_addr, unsigned long attrs)
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{
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int order = get_order(size);
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phys_addr_t phys;
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u64 dma_mask = DMA_BIT_MASK(32);
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struct page *page;
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if (hwdev && hwdev->coherent_dma_mask)
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dma_mask = hwdev->coherent_dma_mask;
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/* do not use virt_to_phys because on ARM it doesn't return you the
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* physical address */
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phys = xen_dma_to_phys(hwdev, dev_addr);
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/* Convert the size to actually allocated. */
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size = 1UL << (order + XEN_PAGE_SHIFT);
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if (is_vmalloc_addr(vaddr))
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page = vmalloc_to_page(vaddr);
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else
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page = virt_to_page(vaddr);
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if (!WARN_ON((dev_addr + size - 1 > dma_mask) ||
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range_straddles_page_boundary(phys, size)) &&
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TestClearPageXenRemapped(page))
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xen_destroy_contiguous_region(phys, order);
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xen_free_coherent_pages(hwdev, size, vaddr, phys_to_dma(hwdev, phys),
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attrs);
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}
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/*
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* Map a single buffer of the indicated size for DMA in streaming mode. The
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* physical address to use is returned.
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*
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* Once the device is given the dma address, the device owns this memory until
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* either xen_swiotlb_unmap_page or xen_swiotlb_dma_sync_single is performed.
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*/
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static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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phys_addr_t map, phys = page_to_phys(page) + offset;
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dma_addr_t dev_addr = xen_phys_to_dma(dev, phys);
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BUG_ON(dir == DMA_NONE);
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/*
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* If the address happens to be in the device's DMA window,
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* we can safely return the device addr and not worry about bounce
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* buffering it.
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*/
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if (dma_capable(dev, dev_addr, size, true) &&
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!range_straddles_page_boundary(phys, size) &&
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!xen_arch_need_swiotlb(dev, phys, dev_addr) &&
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!is_swiotlb_force_bounce(dev))
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goto done;
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/*
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* Oh well, have to allocate and map a bounce buffer.
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*/
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trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
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map = swiotlb_tbl_map_single(dev, phys, size, size, 0, dir, attrs);
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if (map == (phys_addr_t)DMA_MAPPING_ERROR)
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return DMA_MAPPING_ERROR;
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phys = map;
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dev_addr = xen_phys_to_dma(dev, map);
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/*
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* Ensure that the address returned is DMA'ble
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*/
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if (unlikely(!dma_capable(dev, dev_addr, size, true))) {
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swiotlb_tbl_unmap_single(dev, map, size, dir,
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attrs | DMA_ATTR_SKIP_CPU_SYNC);
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return DMA_MAPPING_ERROR;
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}
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done:
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if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
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if (pfn_valid(PFN_DOWN(dma_to_phys(dev, dev_addr))))
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arch_sync_dma_for_device(phys, size, dir);
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else
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xen_dma_sync_for_device(dev, dev_addr, size, dir);
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}
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return dev_addr;
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}
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/*
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* Unmap a single streaming mode DMA translation. The dma_addr and size must
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* match what was provided for in a previous xen_swiotlb_map_page call. All
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* other usages are undefined.
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*
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* After this call, reads by the cpu to the buffer are guaranteed to see
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* whatever the device wrote there.
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*/
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static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir, unsigned long attrs)
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{
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phys_addr_t paddr = xen_dma_to_phys(hwdev, dev_addr);
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BUG_ON(dir == DMA_NONE);
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if (!dev_is_dma_coherent(hwdev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
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if (pfn_valid(PFN_DOWN(dma_to_phys(hwdev, dev_addr))))
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arch_sync_dma_for_cpu(paddr, size, dir);
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else
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xen_dma_sync_for_cpu(hwdev, dev_addr, size, dir);
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}
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/* NOTE: We use dev_addr here, not paddr! */
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if (is_xen_swiotlb_buffer(hwdev, dev_addr))
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swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs);
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}
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static void
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xen_swiotlb_sync_single_for_cpu(struct device *dev, dma_addr_t dma_addr,
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size_t size, enum dma_data_direction dir)
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{
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phys_addr_t paddr = xen_dma_to_phys(dev, dma_addr);
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if (!dev_is_dma_coherent(dev)) {
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if (pfn_valid(PFN_DOWN(dma_to_phys(dev, dma_addr))))
|
|
arch_sync_dma_for_cpu(paddr, size, dir);
|
|
else
|
|
xen_dma_sync_for_cpu(dev, dma_addr, size, dir);
|
|
}
|
|
|
|
if (is_xen_swiotlb_buffer(dev, dma_addr))
|
|
swiotlb_sync_single_for_cpu(dev, paddr, size, dir);
|
|
}
|
|
|
|
static void
|
|
xen_swiotlb_sync_single_for_device(struct device *dev, dma_addr_t dma_addr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
phys_addr_t paddr = xen_dma_to_phys(dev, dma_addr);
|
|
|
|
if (is_xen_swiotlb_buffer(dev, dma_addr))
|
|
swiotlb_sync_single_for_device(dev, paddr, size, dir);
|
|
|
|
if (!dev_is_dma_coherent(dev)) {
|
|
if (pfn_valid(PFN_DOWN(dma_to_phys(dev, dma_addr))))
|
|
arch_sync_dma_for_device(paddr, size, dir);
|
|
else
|
|
xen_dma_sync_for_device(dev, dma_addr, size, dir);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unmap a set of streaming mode DMA translations. Again, cpu read rules
|
|
* concerning calls here are the same as for swiotlb_unmap_page() above.
|
|
*/
|
|
static void
|
|
xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
BUG_ON(dir == DMA_NONE);
|
|
|
|
for_each_sg(sgl, sg, nelems, i)
|
|
xen_swiotlb_unmap_page(hwdev, sg->dma_address, sg_dma_len(sg),
|
|
dir, attrs);
|
|
|
|
}
|
|
|
|
static int
|
|
xen_swiotlb_map_sg(struct device *dev, struct scatterlist *sgl, int nelems,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
BUG_ON(dir == DMA_NONE);
|
|
|
|
for_each_sg(sgl, sg, nelems, i) {
|
|
sg->dma_address = xen_swiotlb_map_page(dev, sg_page(sg),
|
|
sg->offset, sg->length, dir, attrs);
|
|
if (sg->dma_address == DMA_MAPPING_ERROR)
|
|
goto out_unmap;
|
|
sg_dma_len(sg) = sg->length;
|
|
}
|
|
|
|
return nelems;
|
|
out_unmap:
|
|
xen_swiotlb_unmap_sg(dev, sgl, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);
|
|
sg_dma_len(sgl) = 0;
|
|
return -EIO;
|
|
}
|
|
|
|
static void
|
|
xen_swiotlb_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
|
|
int nelems, enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nelems, i) {
|
|
xen_swiotlb_sync_single_for_cpu(dev, sg->dma_address,
|
|
sg->length, dir);
|
|
}
|
|
}
|
|
|
|
static void
|
|
xen_swiotlb_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
|
|
int nelems, enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
for_each_sg(sgl, sg, nelems, i) {
|
|
xen_swiotlb_sync_single_for_device(dev, sg->dma_address,
|
|
sg->length, dir);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return whether the given device DMA address mask can be supported
|
|
* properly. For example, if your device can only drive the low 24-bits
|
|
* during bus mastering, then you would pass 0x00ffffff as the mask to
|
|
* this function.
|
|
*/
|
|
static int
|
|
xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
|
|
{
|
|
return xen_phys_to_dma(hwdev, io_tlb_default_mem.end - 1) <= mask;
|
|
}
|
|
|
|
const struct dma_map_ops xen_swiotlb_dma_ops = {
|
|
.alloc = xen_swiotlb_alloc_coherent,
|
|
.free = xen_swiotlb_free_coherent,
|
|
.sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
|
|
.sync_single_for_device = xen_swiotlb_sync_single_for_device,
|
|
.sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
|
|
.sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
|
|
.map_sg = xen_swiotlb_map_sg,
|
|
.unmap_sg = xen_swiotlb_unmap_sg,
|
|
.map_page = xen_swiotlb_map_page,
|
|
.unmap_page = xen_swiotlb_unmap_page,
|
|
.dma_supported = xen_swiotlb_dma_supported,
|
|
.mmap = dma_common_mmap,
|
|
.get_sgtable = dma_common_get_sgtable,
|
|
.alloc_pages = dma_common_alloc_pages,
|
|
.free_pages = dma_common_free_pages,
|
|
};
|