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-rw-r--r--drivers/firmware/efi/Kconfig13
-rw-r--r--drivers/firmware/efi/Makefile1
-rw-r--r--drivers/firmware/efi/apple-properties.c248
3 files changed, 262 insertions, 0 deletions
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 893fda48fcdd..2e78b0b96d74 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -129,6 +129,19 @@ config EFI_TEST
Say Y here to enable the runtime services support via /dev/efi_test.
If unsure, say N.
+config APPLE_PROPERTIES
+ bool "Apple Device Properties"
+ depends on EFI_STUB && X86
+ select EFI_DEV_PATH_PARSER
+ select UCS2_STRING
+ help
+ Retrieve properties from EFI on Apple Macs and assign them to
+ devices, allowing for improved support of Apple hardware.
+ Properties that would otherwise be missing include the
+ Thunderbolt Device ROM and GPU configuration data.
+
+ If unsure, say Y if you have a Mac. Otherwise N.
+
endmenu
config UEFI_CPER
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index 3e91ae31f9d1..ad67342313ed 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o
obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
obj-$(CONFIG_EFI_TEST) += test/
obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o
+obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o
arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o
obj-$(CONFIG_ARM) += $(arm-obj-y)
diff --git a/drivers/firmware/efi/apple-properties.c b/drivers/firmware/efi/apple-properties.c
new file mode 100644
index 000000000000..c473f4c5ca34
--- /dev/null
+++ b/drivers/firmware/efi/apple-properties.c
@@ -0,0 +1,248 @@
+/*
+ * apple-properties.c - EFI device properties on Macs
+ * Copyright (C) 2016 Lukas Wunner <lukas@wunner.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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/>.
+ */
+
+#define pr_fmt(fmt) "apple-properties: " fmt
+
+#include <linux/bootmem.h>
+#include <linux/dmi.h>
+#include <linux/efi.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+#include <linux/ucs2_string.h>
+#include <asm/setup.h>
+
+static bool dump_properties __initdata;
+
+static int __init dump_properties_enable(char *arg)
+{
+ dump_properties = true;
+ return 0;
+}
+
+__setup("dump_apple_properties", dump_properties_enable);
+
+struct dev_header {
+ u32 len;
+ u32 prop_count;
+ struct efi_dev_path path[0];
+ /*
+ * followed by key/value pairs, each key and value preceded by u32 len,
+ * len includes itself, value may be empty (in which case its len is 4)
+ */
+};
+
+struct properties_header {
+ u32 len;
+ u32 version;
+ u32 dev_count;
+ struct dev_header dev_header[0];
+};
+
+static u8 one __initdata = 1;
+
+static void __init unmarshal_key_value_pairs(struct dev_header *dev_header,
+ struct device *dev, void *ptr,
+ struct property_entry entry[])
+{
+ int i;
+
+ for (i = 0; i < dev_header->prop_count; i++) {
+ int remaining = dev_header->len - (ptr - (void *)dev_header);
+ u32 key_len, val_len;
+ char *key;
+
+ if (sizeof(key_len) > remaining)
+ break;
+
+ key_len = *(typeof(key_len) *)ptr;
+ if (key_len + sizeof(val_len) > remaining ||
+ key_len < sizeof(key_len) + sizeof(efi_char16_t) ||
+ *(efi_char16_t *)(ptr + sizeof(key_len)) == 0) {
+ dev_err(dev, "invalid property name len at %#zx\n",
+ ptr - (void *)dev_header);
+ break;
+ }
+
+ val_len = *(typeof(val_len) *)(ptr + key_len);
+ if (key_len + val_len > remaining ||
+ val_len < sizeof(val_len)) {
+ dev_err(dev, "invalid property val len at %#zx\n",
+ ptr - (void *)dev_header + key_len);
+ break;
+ }
+
+ /* 4 bytes to accommodate UTF-8 code points + null byte */
+ key = kzalloc((key_len - sizeof(key_len)) * 4 + 1, GFP_KERNEL);
+ if (!key) {
+ dev_err(dev, "cannot allocate property name\n");
+ break;
+ }
+ ucs2_as_utf8(key, ptr + sizeof(key_len),
+ key_len - sizeof(key_len));
+
+ entry[i].name = key;
+ entry[i].is_array = true;
+ entry[i].length = val_len - sizeof(val_len);
+ entry[i].pointer.raw_data = ptr + key_len + sizeof(val_len);
+ if (!entry[i].length) {
+ /* driver core doesn't accept empty properties */
+ entry[i].length = 1;
+ entry[i].pointer.raw_data = &one;
+ }
+
+ if (dump_properties) {
+ dev_info(dev, "property: %s\n", entry[i].name);
+ print_hex_dump(KERN_INFO, pr_fmt(), DUMP_PREFIX_OFFSET,
+ 16, 1, entry[i].pointer.raw_data,
+ entry[i].length, true);
+ }
+
+ ptr += key_len + val_len;
+ }
+
+ if (i != dev_header->prop_count) {
+ dev_err(dev, "got %d device properties, expected %u\n", i,
+ dev_header->prop_count);
+ print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
+ 16, 1, dev_header, dev_header->len, true);
+ return;
+ }
+
+ dev_info(dev, "assigning %d device properties\n", i);
+}
+
+static int __init unmarshal_devices(struct properties_header *properties)
+{
+ size_t offset = offsetof(struct properties_header, dev_header[0]);
+
+ while (offset + sizeof(struct dev_header) < properties->len) {
+ struct dev_header *dev_header = (void *)properties + offset;
+ struct property_entry *entry = NULL;
+ struct device *dev;
+ size_t len;
+ int ret, i;
+ void *ptr;
+
+ if (offset + dev_header->len > properties->len ||
+ dev_header->len <= sizeof(*dev_header)) {
+ pr_err("invalid len in dev_header at %#zx\n", offset);
+ return -EINVAL;
+ }
+
+ ptr = dev_header->path;
+ len = dev_header->len - sizeof(*dev_header);
+
+ dev = efi_get_device_by_path((struct efi_dev_path **)&ptr, &len);
+ if (IS_ERR(dev)) {
+ pr_err("device path parse error %ld at %#zx:\n",
+ PTR_ERR(dev), ptr - (void *)dev_header);
+ print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
+ 16, 1, dev_header, dev_header->len, true);
+ dev = NULL;
+ goto skip_device;
+ }
+
+ entry = kcalloc(dev_header->prop_count + 1, sizeof(*entry),
+ GFP_KERNEL);
+ if (!entry) {
+ dev_err(dev, "cannot allocate properties\n");
+ goto skip_device;
+ }
+
+ unmarshal_key_value_pairs(dev_header, dev, ptr, entry);
+ if (!entry[0].name)
+ goto skip_device;
+
+ ret = device_add_properties(dev, entry); /* makes deep copy */
+ if (ret)
+ dev_err(dev, "error %d assigning properties\n", ret);
+
+ for (i = 0; entry[i].name; i++)
+ kfree(entry[i].name);
+
+skip_device:
+ kfree(entry);
+ put_device(dev);
+ offset += dev_header->len;
+ }
+
+ return 0;
+}
+
+static int __init map_properties(void)
+{
+ struct properties_header *properties;
+ struct setup_data *data;
+ u32 data_len;
+ u64 pa_data;
+ int ret;
+
+ if (!dmi_match(DMI_SYS_VENDOR, "Apple Inc.") &&
+ !dmi_match(DMI_SYS_VENDOR, "Apple Computer, Inc."))
+ return 0;
+
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = ioremap(pa_data, sizeof(*data));
+ if (!data) {
+ pr_err("cannot map setup_data header\n");
+ return -ENOMEM;
+ }
+
+ if (data->type != SETUP_APPLE_PROPERTIES) {
+ pa_data = data->next;
+ iounmap(data);
+ continue;
+ }
+
+ data_len = data->len;
+ iounmap(data);
+
+ data = ioremap(pa_data, sizeof(*data) + data_len);
+ if (!data) {
+ pr_err("cannot map setup_data payload\n");
+ return -ENOMEM;
+ }
+
+ properties = (struct properties_header *)data->data;
+ if (properties->version != 1) {
+ pr_err("unsupported version:\n");
+ print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
+ 16, 1, properties, data_len, true);
+ ret = -ENOTSUPP;
+ } else if (properties->len != data_len) {
+ pr_err("length mismatch, expected %u\n", data_len);
+ print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
+ 16, 1, properties, data_len, true);
+ ret = -EINVAL;
+ } else
+ ret = unmarshal_devices(properties);
+
+ /*
+ * Can only free the setup_data payload but not its header
+ * to avoid breaking the chain of ->next pointers.
+ */
+ data->len = 0;
+ iounmap(data);
+ free_bootmem_late(pa_data + sizeof(*data), data_len);
+
+ return ret;
+ }
+ return 0;
+}
+
+fs_initcall(map_properties);
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