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![Tom Lendacky](/assets/img/avatar_default.png)
The ioremap() function is intended for mapping MMIO. For RAM, the memremap() function should be used. Convert calls from ioremap() to memremap() when re-mapping RAM. This will be used later by SME to control how the encryption mask is applied to memory mappings, with certain memory locations being mapped decrypted vs encrypted. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Toshimitsu Kani <toshi.kani@hpe.com> Cc: kasan-dev@googlegroups.com Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/b13fccb9abbd547a7eef7b1fdfc223431b211c88.1500319216.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
202 lines
3.6 KiB
C
202 lines
3.6 KiB
C
/*
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* Architecture specific debugfs files
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*
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* Copyright (C) 2007, Intel Corp.
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* Huang Ying <ying.huang@intel.com>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/stat.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <asm/setup.h>
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struct dentry *arch_debugfs_dir;
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EXPORT_SYMBOL(arch_debugfs_dir);
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#ifdef CONFIG_DEBUG_BOOT_PARAMS
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struct setup_data_node {
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u64 paddr;
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u32 type;
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u32 len;
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};
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static ssize_t setup_data_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct setup_data_node *node = file->private_data;
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unsigned long remain;
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loff_t pos = *ppos;
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void *p;
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u64 pa;
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if (pos < 0)
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return -EINVAL;
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if (pos >= node->len)
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return 0;
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if (count > node->len - pos)
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count = node->len - pos;
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pa = node->paddr + sizeof(struct setup_data) + pos;
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p = memremap(pa, count, MEMREMAP_WB);
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if (!p)
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return -ENOMEM;
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remain = copy_to_user(user_buf, p, count);
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memunmap(p);
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if (remain)
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return -EFAULT;
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*ppos = pos + count;
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return count;
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}
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static const struct file_operations fops_setup_data = {
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.read = setup_data_read,
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.open = simple_open,
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.llseek = default_llseek,
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};
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static int __init
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create_setup_data_node(struct dentry *parent, int no,
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struct setup_data_node *node)
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{
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struct dentry *d, *type, *data;
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char buf[16];
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sprintf(buf, "%d", no);
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d = debugfs_create_dir(buf, parent);
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if (!d)
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return -ENOMEM;
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type = debugfs_create_x32("type", S_IRUGO, d, &node->type);
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if (!type)
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goto err_dir;
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data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
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if (!data)
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goto err_type;
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return 0;
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err_type:
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debugfs_remove(type);
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err_dir:
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debugfs_remove(d);
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return -ENOMEM;
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}
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static int __init create_setup_data_nodes(struct dentry *parent)
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{
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struct setup_data_node *node;
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struct setup_data *data;
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int error;
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struct dentry *d;
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u64 pa_data;
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int no = 0;
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d = debugfs_create_dir("setup_data", parent);
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if (!d)
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return -ENOMEM;
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pa_data = boot_params.hdr.setup_data;
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while (pa_data) {
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node = kmalloc(sizeof(*node), GFP_KERNEL);
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if (!node) {
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error = -ENOMEM;
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goto err_dir;
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}
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data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
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if (!data) {
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kfree(node);
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error = -ENOMEM;
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goto err_dir;
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}
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node->paddr = pa_data;
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node->type = data->type;
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node->len = data->len;
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error = create_setup_data_node(d, no, node);
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pa_data = data->next;
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memunmap(data);
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if (error)
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goto err_dir;
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no++;
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}
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return 0;
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err_dir:
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debugfs_remove(d);
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return error;
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}
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static struct debugfs_blob_wrapper boot_params_blob = {
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.data = &boot_params,
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.size = sizeof(boot_params),
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};
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static int __init boot_params_kdebugfs_init(void)
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{
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struct dentry *dbp, *version, *data;
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int error = -ENOMEM;
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dbp = debugfs_create_dir("boot_params", arch_debugfs_dir);
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if (!dbp)
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return -ENOMEM;
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version = debugfs_create_x16("version", S_IRUGO, dbp,
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&boot_params.hdr.version);
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if (!version)
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goto err_dir;
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data = debugfs_create_blob("data", S_IRUGO, dbp,
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&boot_params_blob);
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if (!data)
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goto err_version;
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error = create_setup_data_nodes(dbp);
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if (error)
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goto err_data;
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return 0;
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err_data:
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debugfs_remove(data);
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err_version:
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debugfs_remove(version);
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err_dir:
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debugfs_remove(dbp);
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return error;
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}
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#endif /* CONFIG_DEBUG_BOOT_PARAMS */
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static int __init arch_kdebugfs_init(void)
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{
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int error = 0;
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arch_debugfs_dir = debugfs_create_dir("x86", NULL);
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if (!arch_debugfs_dir)
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return -ENOMEM;
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#ifdef CONFIG_DEBUG_BOOT_PARAMS
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error = boot_params_kdebugfs_init();
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#endif
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return error;
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}
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arch_initcall(arch_kdebugfs_init);
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