efi: Add "efi_fake_mem" boot option

This patch introduces new boot option named "efi_fake_mem".
By specifying this parameter, you can add arbitrary attribute
to specific memory range.
This is useful for debugging of Address Range Mirroring feature.

For example, if "efi_fake_mem=2G@4G:0x10000,2G@0x10a0000000:0x10000"
is specified, the original (firmware provided) EFI memmap will be
updated so that the specified memory regions have
EFI_MEMORY_MORE_RELIABLE attribute (0x10000):

 <original>
   efi: mem36: [Conventional Memory|  |  |  |  |  |   |WB|WT|WC|UC] range=[0x0000000100000000-0x00000020a0000000) (129536MB)

 <updated>
   efi: mem36: [Conventional Memory|  |MR|  |  |  |   |WB|WT|WC|UC] range=[0x0000000100000000-0x0000000180000000) (2048MB)
   efi: mem37: [Conventional Memory|  |  |  |  |  |   |WB|WT|WC|UC] range=[0x0000000180000000-0x00000010a0000000) (61952MB)
   efi: mem38: [Conventional Memory|  |MR|  |  |  |   |WB|WT|WC|UC] range=[0x00000010a0000000-0x0000001120000000) (2048MB)
   efi: mem39: [Conventional Memory|  |  |  |  |  |   |WB|WT|WC|UC] range=[0x0000001120000000-0x00000020a0000000) (63488MB)

And you will find that the following message is output:

   efi: Memory: 4096M/131455M mirrored memory

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

3 files changed, 261 insertions, 0 deletions

diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 54071c148340..1de6f0ed5077 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -52,6 +52,28 @@ config EFI_RUNTIME_MAP
 
           See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
 
+config EFI_FAKE_MEMMAP
+        bool "Enable EFI fake memory map"
+        depends on EFI && X86
+        default n
+        help
+          Saying Y here will enable "efi_fake_mem" boot option.
+          By specifying this parameter, you can add arbitrary attribute
+          to specific memory range by updating original (firmware provided)
+          EFI memmap.
+          This is useful for debugging of EFI memmap related feature.
+          e.g. Address Range Mirroring feature.
+
+config EFI_MAX_FAKE_MEM
+        int "maximum allowable number of ranges in efi_fake_mem boot option"
+        depends on EFI_FAKE_MEMMAP
+        range 1 128
+        default 8
+        help
+          Maximum allowable number of ranges in efi_fake_mem boot option.
+          Ranges can be set up to this value using comma-separated list.
+          The default value is 8.
+
 config EFI_PARAMS_FROM_FDT
         bool
         help
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index 6fd3da938717..c24f00569acb 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_UEFI_CPER)			+= cper.o
 obj-$(CONFIG_EFI_RUNTIME_MAP)           += runtime-map.o
 obj-$(CONFIG_EFI_RUNTIME_WRAPPERS)      += runtime-wrappers.o
 obj-$(CONFIG_EFI_STUB)                  += libstub/
+obj-$(CONFIG_EFI_FAKE_MEMMAP)           += fake_mem.o
diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c
new file mode 100644
index 000000000000..32bcb14df2c8
--- /dev/null
+++ b/drivers/firmware/efi/fake_mem.c
@@ -0,0 +1,238 @@
+/*
+ * fake_mem.c
+ *
+ * Copyright (C) 2015 FUJITSU LIMITED
+ * Author: Taku Izumi <izumi.taku@jp.fujitsu.com>
+ *
+ * This code introduces new boot option named "efi_fake_mem"
+ * By specifying this parameter, you can add arbitrary attribute to
+ * specific memory range by updating original (firmware provided) EFI
+ * memmap.
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms and conditions of the GNU General Public License,
+ *  version 2, as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ *  more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  The full GNU General Public License is included in this distribution in
+ *  the file called "COPYING".
+ */
+
+#include <linux/kernel.h>
+#include <linux/efi.h>
+#include <linux/init.h>
+#include <linux/memblock.h>
+#include <linux/types.h>
+#include <linux/sort.h>
+#include <asm/efi.h>
+
+#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM
+
+struct fake_mem {
+        struct range range;
+        u64 attribute;
+};
+static struct fake_mem fake_mems[EFI_MAX_FAKEMEM];
+static int nr_fake_mem;
+
+static int __init cmp_fake_mem(const void *x1, const void *x2)
+{
+        const struct fake_mem *m1 = x1;
+        const struct fake_mem *m2 = x2;
+
+        if (m1->range.start < m2->range.start)
+                return -1;
+        if (m1->range.start > m2->range.start)
+                return 1;
+        return 0;
+}
+
+void __init efi_fake_memmap(void)
+{
+        u64 start, end, m_start, m_end, m_attr;
+        int new_nr_map = memmap.nr_map;
+        efi_memory_desc_t *md;
+        u64 new_memmap_phy;
+        void *new_memmap;
+        void *old, *new;
+        int i;
+
+        if (!nr_fake_mem || !efi_enabled(EFI_MEMMAP))
+                return;
+
+        /* count up the number of EFI memory descriptor */
+        for (old = memmap.map; old < memmap.map_end; old += memmap.desc_size) {
+                md = old;
+                start = md->phys_addr;
+                end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
+
+                for (i = 0; i < nr_fake_mem; i++) {
+                        /* modifying range */
+                        m_start = fake_mems[i].range.start;
+                        m_end = fake_mems[i].range.end;
+
+                        if (m_start <= start) {
+                                /* split into 2 parts */
+                                if (start < m_end && m_end < end)
+                                        new_nr_map++;
+                        }
+                        if (start < m_start && m_start < end) {
+                                /* split into 3 parts */
+                                if (m_end < end)
+                                        new_nr_map += 2;
+                                /* split into 2 parts */
+                                if (end <= m_end)
+                                        new_nr_map++;
+                        }
+                }
+        }
+
+        /* allocate memory for new EFI memmap */
+        new_memmap_phy = memblock_alloc(memmap.desc_size * new_nr_map,
+                                        PAGE_SIZE);
+        if (!new_memmap_phy)
+                return;
+
+        /* create new EFI memmap */
+        new_memmap = early_memremap(new_memmap_phy,
+                                    memmap.desc_size * new_nr_map);
+        if (!new_memmap) {
+                memblock_free(new_memmap_phy, memmap.desc_size * new_nr_map);
+                return;
+        }
+
+        for (old = memmap.map, new = new_memmap;
+             old < memmap.map_end;
+             old += memmap.desc_size, new += memmap.desc_size) {
+
+                /* copy original EFI memory descriptor */
+                memcpy(new, old, memmap.desc_size);
+                md = new;
+                start = md->phys_addr;
+                end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
+
+                for (i = 0; i < nr_fake_mem; i++) {
+                        /* modifying range */
+                        m_start = fake_mems[i].range.start;
+                        m_end = fake_mems[i].range.end;
+                        m_attr = fake_mems[i].attribute;
+
+                        if (m_start <= start && end <= m_end)
+                                md->attribute |= m_attr;
+
+                        if (m_start <= start &&
+                            (start < m_end && m_end < end)) {
+                                /* first part */
+                                md->attribute |= m_attr;
+                                md->num_pages = (m_end - md->phys_addr + 1) >>
+                                        EFI_PAGE_SHIFT;
+                                /* latter part */
+                                new += memmap.desc_size;
+                                memcpy(new, old, memmap.desc_size);
+                                md = new;
+                                md->phys_addr = m_end + 1;
+                                md->num_pages = (end - md->phys_addr + 1) >>
+                                        EFI_PAGE_SHIFT;
+                        }
+
+                        if ((start < m_start && m_start < end) && m_end < end) {
+                                /* first part */
+                                md->num_pages = (m_start - md->phys_addr) >>
+                                        EFI_PAGE_SHIFT;
+                                /* middle part */
+                                new += memmap.desc_size;
+                                memcpy(new, old, memmap.desc_size);
+                                md = new;
+                                md->attribute |= m_attr;
+                                md->phys_addr = m_start;
+                                md->num_pages = (m_end - m_start + 1) >>
+                                        EFI_PAGE_SHIFT;
+                                /* last part */
+                                new += memmap.desc_size;
+                                memcpy(new, old, memmap.desc_size);
+                                md = new;
+                                md->phys_addr = m_end + 1;
+                                md->num_pages = (end - m_end) >>
+                                        EFI_PAGE_SHIFT;
+                        }
+
+                        if ((start < m_start && m_start < end) &&
+                            (end <= m_end)) {
+                                /* first part */
+                                md->num_pages = (m_start - md->phys_addr) >>
+                                        EFI_PAGE_SHIFT;
+                                /* latter part */
+                                new += memmap.desc_size;
+                                memcpy(new, old, memmap.desc_size);
+                                md = new;
+                                md->phys_addr = m_start;
+                                md->num_pages = (end - md->phys_addr + 1) >>
+                                        EFI_PAGE_SHIFT;
+                                md->attribute |= m_attr;
+                        }
+                }
+        }
+
+        /* swap into new EFI memmap */
+        efi_unmap_memmap();
+        memmap.map = new_memmap;
+        memmap.phys_map = (void *)new_memmap_phy;
+        memmap.nr_map = new_nr_map;
+        memmap.map_end = memmap.map + memmap.nr_map * memmap.desc_size;
+        set_bit(EFI_MEMMAP, &efi.flags);
+
+        /* print new EFI memmap */
+        efi_print_memmap();
+}
+
+static int __init setup_fake_mem(char *p)
+{
+        u64 start = 0, mem_size = 0, attribute = 0;
+        int i;
+
+        if (!p)
+                return -EINVAL;
+
+        while (*p != '\0') {
+                mem_size = memparse(p, &p);
+                if (*p == '@')
+                        start = memparse(p+1, &p);
+                else
+                        break;
+
+                if (*p == ':')
+                        attribute = simple_strtoull(p+1, &p, 0);
+                else
+                        break;
+
+                if (nr_fake_mem >= EFI_MAX_FAKEMEM)
+                        break;
+
+                fake_mems[nr_fake_mem].range.start = start;
+                fake_mems[nr_fake_mem].range.end = start + mem_size - 1;
+                fake_mems[nr_fake_mem].attribute = attribute;
+                nr_fake_mem++;
+
+                if (*p == ',')
+                        p++;
+        }
+
+        sort(fake_mems, nr_fake_mem, sizeof(struct fake_mem),
+             cmp_fake_mem, NULL);
+
+        for (i = 0; i < nr_fake_mem; i++)
+                pr_info("efi_fake_mem: add attr=0x%016llx to [mem 0x%016llx-0x%016llx]",
+                        fake_mems[i].attribute, fake_mems[i].range.start,
+                        fake_mems[i].range.end);
+
+        return *p == '\0' ? 0 : -EINVAL;
+}
+
+early_param("efi_fake_mem", setup_fake_mem);