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![Dan Williams](/assets/img/avatar_default.png)
Cleanup fill_list() to keep all the pgmap manipulations in a single location of the function. Update the exit unwind path accordingly. Link: http://lore.kernel.org/r/6186fa28-d123-12db-6171-a75cb6e615a5@oracle.com Link: https://lkml.kernel.org/r/160272253442.3136502.16683842453317773487.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Juergen Gross <jgross@suse.com> Cc: Stefano Stabellini <sstabellini@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
202 lines
4.3 KiB
C
202 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/errno.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/memremap.h>
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#include <linux/slab.h>
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#include <asm/page.h>
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#include <xen/page.h>
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#include <xen/xen.h>
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static DEFINE_MUTEX(list_lock);
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static struct page *page_list;
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static unsigned int list_count;
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static int fill_list(unsigned int nr_pages)
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{
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struct dev_pagemap *pgmap;
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struct resource *res;
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void *vaddr;
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unsigned int i, alloc_pages = round_up(nr_pages, PAGES_PER_SECTION);
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int ret = -ENOMEM;
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res = kzalloc(sizeof(*res), GFP_KERNEL);
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if (!res)
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return -ENOMEM;
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res->name = "Xen scratch";
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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ret = allocate_resource(&iomem_resource, res,
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alloc_pages * PAGE_SIZE, 0, -1,
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PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
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if (ret < 0) {
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pr_err("Cannot allocate new IOMEM resource\n");
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goto err_resource;
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}
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pgmap = kzalloc(sizeof(*pgmap), GFP_KERNEL);
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if (!pgmap)
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goto err_pgmap;
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pgmap->type = MEMORY_DEVICE_GENERIC;
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pgmap->range = (struct range) {
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.start = res->start,
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.end = res->end,
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};
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pgmap->nr_range = 1;
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pgmap->owner = res;
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#ifdef CONFIG_XEN_HAVE_PVMMU
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/*
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* memremap will build page tables for the new memory so
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* the p2m must contain invalid entries so the correct
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* non-present PTEs will be written.
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*
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* If a failure occurs, the original (identity) p2m entries
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* are not restored since this region is now known not to
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* conflict with any devices.
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*/
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if (!xen_feature(XENFEAT_auto_translated_physmap)) {
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xen_pfn_t pfn = PFN_DOWN(res->start);
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for (i = 0; i < alloc_pages; i++) {
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if (!set_phys_to_machine(pfn + i, INVALID_P2M_ENTRY)) {
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pr_warn("set_phys_to_machine() failed, no memory added\n");
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ret = -ENOMEM;
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goto err_memremap;
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}
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}
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}
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#endif
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vaddr = memremap_pages(pgmap, NUMA_NO_NODE);
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if (IS_ERR(vaddr)) {
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pr_err("Cannot remap memory range\n");
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ret = PTR_ERR(vaddr);
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goto err_memremap;
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}
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for (i = 0; i < alloc_pages; i++) {
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struct page *pg = virt_to_page(vaddr + PAGE_SIZE * i);
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BUG_ON(!virt_addr_valid(vaddr + PAGE_SIZE * i));
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pg->zone_device_data = page_list;
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page_list = pg;
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list_count++;
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}
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return 0;
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err_memremap:
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kfree(pgmap);
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err_pgmap:
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release_resource(res);
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err_resource:
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kfree(res);
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return ret;
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}
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/**
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* xen_alloc_unpopulated_pages - alloc unpopulated pages
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* @nr_pages: Number of pages
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* @pages: pages returned
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* @return 0 on success, error otherwise
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*/
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int xen_alloc_unpopulated_pages(unsigned int nr_pages, struct page **pages)
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{
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unsigned int i;
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int ret = 0;
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mutex_lock(&list_lock);
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if (list_count < nr_pages) {
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ret = fill_list(nr_pages - list_count);
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if (ret)
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goto out;
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}
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for (i = 0; i < nr_pages; i++) {
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struct page *pg = page_list;
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BUG_ON(!pg);
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page_list = pg->zone_device_data;
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list_count--;
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pages[i] = pg;
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#ifdef CONFIG_XEN_HAVE_PVMMU
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if (!xen_feature(XENFEAT_auto_translated_physmap)) {
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ret = xen_alloc_p2m_entry(page_to_pfn(pg));
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if (ret < 0) {
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unsigned int j;
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for (j = 0; j <= i; j++) {
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pages[j]->zone_device_data = page_list;
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page_list = pages[j];
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list_count++;
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}
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goto out;
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}
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}
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#endif
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}
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out:
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mutex_unlock(&list_lock);
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return ret;
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}
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EXPORT_SYMBOL(xen_alloc_unpopulated_pages);
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/**
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* xen_free_unpopulated_pages - return unpopulated pages
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* @nr_pages: Number of pages
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* @pages: pages to return
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*/
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void xen_free_unpopulated_pages(unsigned int nr_pages, struct page **pages)
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{
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unsigned int i;
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mutex_lock(&list_lock);
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for (i = 0; i < nr_pages; i++) {
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pages[i]->zone_device_data = page_list;
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page_list = pages[i];
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list_count++;
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}
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mutex_unlock(&list_lock);
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}
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EXPORT_SYMBOL(xen_free_unpopulated_pages);
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#ifdef CONFIG_XEN_PV
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static int __init init(void)
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{
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unsigned int i;
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if (!xen_domain())
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return -ENODEV;
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if (!xen_pv_domain())
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return 0;
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/*
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* Initialize with pages from the extra memory regions (see
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* arch/x86/xen/setup.c).
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*/
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for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
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unsigned int j;
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for (j = 0; j < xen_extra_mem[i].n_pfns; j++) {
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struct page *pg =
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pfn_to_page(xen_extra_mem[i].start_pfn + j);
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pg->zone_device_data = page_list;
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page_list = pg;
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list_count++;
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}
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}
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return 0;
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}
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subsys_initcall(init);
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#endif
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