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Subject[PATCH 3/5V2] EFI: add efi driver for Xen efi
Date
From: Jan Beulich <JBeulich@suse.com>

The efi memory is owned by Xen and efi run-time service can not be called
directly,so a new efi driver is needed by Xen efi.
We call efi run-time service through the Xen in Xen efi driver.

[v2: Modifications done to abstract calls]

Signed-off-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Tang Liang <liang.tang@oracle.com>
---
arch/x86/platform/efi/Makefile | 3 +
arch/x86/platform/efi/efi-xen.c | 432 ++++++++++++++++++++++++++++++++++++++
include/linux/efi.h | 1 +
include/xen/interface/platform.h | 122 +++++++++++
4 files changed, 558 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/platform/efi/efi-xen.c

diff --git a/arch/x86/platform/efi/Makefile b/arch/x86/platform/efi/Makefile
index 73b8be0..9577899 100644
--- a/arch/x86/platform/efi/Makefile
+++ b/arch/x86/platform/efi/Makefile
@@ -1 +1,4 @@
obj-$(CONFIG_EFI) += efi.o efi_$(BITS).o efi_stub_$(BITS).o
+ifdef CONFIG_XEN
+obj-$(CONFIG_EFI) += efi-xen.o
+endif
diff --git a/arch/x86/platform/efi/efi-xen.c b/arch/x86/platform/efi/efi-xen.c
new file mode 100644
index 0000000..c133d60
--- /dev/null
+++ b/arch/x86/platform/efi/efi-xen.c
@@ -0,0 +1,432 @@
+/*
+ * Common EFI (Extensible Firmware Interface) support functions
+ * Based on Extensible Firmware Interface Specification version 1.0
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ * Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@intel.com>
+ * Bibo Mao <bibo.mao@intel.com>
+ * Chandramouli Narayanan <mouli@linux.intel.com>
+ * Huang Ying <ying.huang@intel.com>
+ * Copyright (C) 2011 Novell Co.
+ * Jan Beulic <JBeulich@suse.com>
+ * Copyright (C) 2011-2012 Oracle Co.
+ * Liang Tang <liang.tang@oracle.com>
+ *
+ *
+ * Copied from efi_32.c to eliminate the duplicated code between EFI
+ * 32/64 support code. --ying 2007-10-26
+ *
+ * All EFI Runtime Services are not implemented yet as EFI only
+ * supports physical mode addressing on SoftSDV. This is to be fixed
+ * in a future version. --drummond 1999-07-20
+ *
+ * Implemented EFI runtime services and virtual mode calls. --davidm
+ *
+ * Goutham Rao: <goutham.rao@intel.com>
+ * Skip non-WB memory and ignore empty memory ranges.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/efi.h>
+#include <linux/export.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/time.h>
+
+#include <asm/setup.h>
+#include <asm/efi.h>
+#include <asm/time.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/x86_init.h>
+
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+
+#define PFX "EFI: "
+
+#define call (op.u.efi_runtime_call)
+#define DECLARE_CALL(what) \
+ struct xen_platform_op op; \
+ op.cmd = XENPF_efi_runtime_call; \
+ call.function = XEN_EFI_##what; \
+ call.misc = 0
+
+static void register_xen_efi_function(void);
+
+static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ int err;
+ DECLARE_CALL(get_time);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.get_time.time));
+ memcpy(tm, &call.u.get_time.time, sizeof(*tm));
+ }
+
+ if (tc) {
+ tc->resolution = call.u.get_time.resolution;
+ tc->accuracy = call.u.get_time.accuracy;
+ tc->sets_to_zero = !!(call.misc &
+ XEN_EFI_GET_TIME_SET_CLEARS_NS);
+ }
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_time(efi_time_t *tm)
+{
+ DECLARE_CALL(set_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.set_time));
+ memcpy(&call.u.set_time, tm, sizeof(*tm));
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ int err;
+ DECLARE_CALL(get_wakeup_time);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.get_wakeup_time));
+ memcpy(tm, &call.u.get_wakeup_time, sizeof(*tm));
+ }
+
+ if (enabled)
+ *enabled = !!(call.misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
+
+ if (pending)
+ *pending = !!(call.misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ DECLARE_CALL(set_wakeup_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.set_wakeup_time));
+ if (enabled)
+ call.misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
+ if (tm)
+ memcpy(&call.u.set_wakeup_time, tm, sizeof(*tm));
+ else
+ call.misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_get_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 *attr,
+ unsigned long *data_size,
+ void *data)
+{
+ int err;
+ DECLARE_CALL(get_variable);
+
+ set_xen_guest_handle(call.u.get_variable.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.get_variable.vendor_guid));
+ memcpy(&call.u.get_variable.vendor_guid, vendor, sizeof(*vendor));
+ call.u.get_variable.size = *data_size;
+ set_xen_guest_handle(call.u.get_variable.data, data);
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *data_size = call.u.get_variable.size;
+ *attr = call.misc; /* misc in struction is U32 variable*/
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ int err;
+ DECLARE_CALL(get_next_variable_name);
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+ call.u.get_next_variable_name.size = *name_size;
+ set_xen_guest_handle(call.u.get_next_variable_name.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.get_next_variable_name.vendor_guid));
+ memcpy(&call.u.get_next_variable_name.vendor_guid, vendor,
+ sizeof(*vendor));
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *name_size = call.u.get_next_variable_name.size;
+ memcpy(vendor, &call.u.get_next_variable_name.vendor_guid,
+ sizeof(*vendor));
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 attr,
+ unsigned long data_size,
+ void *data)
+{
+ DECLARE_CALL(set_variable);
+
+ set_xen_guest_handle(call.u.set_variable.name, name);
+ call.misc = attr;
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.set_variable.vendor_guid));
+ memcpy(&call.u.set_variable.vendor_guid, vendor, sizeof(*vendor));
+ call.u.set_variable.size = data_size;
+ set_xen_guest_handle(call.u.set_variable.data, data);
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_query_variable_info(u32 attr,
+ u64 *storage_space,
+ u64 *remaining_space,
+ u64 *max_variable_size)
+{
+ int err;
+ DECLARE_CALL(query_variable_info);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *storage_space = call.u.query_variable_info.max_store_size;
+ *remaining_space = call.u.query_variable_info.remain_store_size;
+ *max_variable_size = call.u.query_variable_info.max_size;
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
+{
+ int err;
+ DECLARE_CALL(get_next_high_monotonic_count);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *count = call.misc;
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+ unsigned long count,
+ unsigned long sg_list)
+{
+ DECLARE_CALL(update_capsule);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(call.u.update_capsule.capsule_header_array,
+ capsules);
+ call.u.update_capsule.capsule_count = count;
+ call.u.update_capsule.sg_list = sg_list;
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+ unsigned long count,
+ u64 *max_size,
+ int *reset_type)
+{
+ int err;
+ DECLARE_CALL(query_capsule_capabilities);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(call.u.query_capsule_capabilities.
+ capsule_header_array, capsules);
+ call.u.query_capsule_capabilities.capsule_count = count;
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *max_size = call.u.query_capsule_capabilities.max_capsule_size;
+ *reset_type = call.u.query_capsule_capabilities.reset_type;
+
+ return call.status;
+}
+
+#undef DECLARE_CALL
+#undef call
+
+static struct efi __read_mostly efi_xen = {
+ .mps = EFI_INVALID_TABLE_ADDR,
+ .acpi = EFI_INVALID_TABLE_ADDR,
+ .acpi20 = EFI_INVALID_TABLE_ADDR,
+ .smbios = EFI_INVALID_TABLE_ADDR,
+ .sal_systab = EFI_INVALID_TABLE_ADDR,
+ .boot_info = EFI_INVALID_TABLE_ADDR,
+ .hcdp = EFI_INVALID_TABLE_ADDR,
+ .uga = EFI_INVALID_TABLE_ADDR,
+ .uv_systab = EFI_INVALID_TABLE_ADDR,
+ .get_time = xen_efi_get_time,
+ .set_time = xen_efi_set_time,
+ .get_wakeup_time = xen_efi_get_wakeup_time,
+ .set_wakeup_time = xen_efi_set_wakeup_time,
+ .get_variable = xen_efi_get_variable,
+ .get_next_variable = xen_efi_get_next_variable,
+ .set_variable = xen_efi_set_variable,
+ .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
+ .query_variable_info = xen_efi_query_variable_info,
+ .update_capsule = xen_efi_update_capsule,
+ .query_capsule_caps = xen_efi_query_capsule_caps,
+};
+
+void xen_efi_probe(void)
+{
+ static struct xen_platform_op __initdata op = {
+ .cmd = XENPF_firmware_info,
+ .u.firmware_info = {
+ .type = XEN_FW_EFI_INFO,
+ .index = XEN_FW_EFI_CONFIG_TABLE
+ }
+ };
+
+ if (HYPERVISOR_dom0_op(&op) == 0) {
+ efi_enabled = 1;
+
+ register_xen_efi_function();
+ }
+}
+
+
+static void __init efi_init_xen(void)
+{
+ efi_config_table_t *config_tables;
+ efi_char16_t c16[100];
+ char vendor[ARRAY_SIZE(c16)] = "unknown";
+ int ret, i;
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ efi = efi_xen;
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+
+ /*
+ * Show what we know for posterity
+ */
+ op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
+ info->vendor.bufsz = sizeof(c16);
+ set_xen_guest_handle(info->vendor.name, c16);
+ ret = HYPERVISOR_dom0_op(&op);
+ if (!ret) {
+ for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i)
+ vendor[i] = c16[i];
+ vendor[i] = '\0';
+ } else
+ pr_err("Could not get the firmware vendor!\n");
+
+ op.u.firmware_info.index = XEN_FW_EFI_VERSION;
+ ret = HYPERVISOR_dom0_op(&op);
+ if (!ret)
+ pr_info("EFI v%u.%.02u by %s\n",
+ info->version >> 16,
+ info->version & 0xffff, vendor);
+ else
+ pr_err("Could not get EFI revision!\n");
+
+ op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
+ ret = HYPERVISOR_dom0_op(&op);
+ if (!ret)
+ efi.runtime_version = info->version;
+ else
+ pr_warn(PFX "Could not get runtime services revision.\n");
+
+ /*
+ * Let's see what config tables the firmware passed to us.
+ */
+ op.u.firmware_info.index = XEN_FW_EFI_CONFIG_TABLE;
+ if (HYPERVISOR_dom0_op(&op))
+ BUG();
+ config_tables = early_ioremap(
+ info->cfg.addr,
+ info->cfg.nent * sizeof(efi_config_table_t));
+ if (config_tables == NULL)
+ panic("Could not map EFI Configuration Table!\n");
+
+ get_efi_table_info(config_tables, info->cfg.nent, &efi);
+
+ early_iounmap(config_tables,
+ info->cfg.nent * sizeof(efi_config_table_t));
+
+ x86_platform.get_wallclock = efi_get_time;
+ x86_platform.set_wallclock = efi_set_rtc_mmss;
+}
+
+/*
+ * Convenience functions to obtain memory types and attributes
+ */
+static u32 efi_mem_type_xen(unsigned long phys_addr)
+{
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_MEM_INFO;
+ info->mem.addr = phys_addr;
+ info->mem.size = 0;
+ return HYPERVISOR_dom0_op(&op) ? 0 : info->mem.type;
+}
+
+static u64 efi_mem_attributes_xen(unsigned long phys_addr)
+{
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_MEM_INFO;
+ info->mem.addr = phys_addr;
+ info->mem.size = 0;
+ return HYPERVISOR_dom0_op(&op) ? 0 : info->mem.attr;
+}
+
+static const struct efi_init_funcs xen_efi_funcs = {
+ .efi_init = efi_init_xen,
+ .efi_reserve_boot_services = NULL,
+ .efi_enter_virtual_mode = NULL,
+ .efi_mem_type = efi_mem_type_xen,
+ .efi_mem_attributes = efi_mem_attributes_xen
+};
+
+static void register_xen_efi_function(void)
+{
+ efi_init_function_register(&xen_efi_funcs);
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 4276c96..7b46590 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -477,6 +477,7 @@ extern struct efi_memory_map memmap;
extern void efi_init_function_register(const struct efi_init_funcs *funcs);
extern void get_efi_table_info(efi_config_table_t *config_tables, int nr_tables,
struct efi *efi_t);
+extern void xen_efi_probe(void);

/**
* efi_range_is_wc - check the WC bit on an address range
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index c168468..77eb0fa 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -108,10 +108,112 @@ struct xenpf_platform_quirk {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_platform_quirk_t);

+#define XENPF_efi_runtime_call 49
+#define XEN_EFI_get_time 1
+#define XEN_EFI_set_time 2
+#define XEN_EFI_get_wakeup_time 3
+#define XEN_EFI_set_wakeup_time 4
+#define XEN_EFI_get_next_high_monotonic_count 5
+#define XEN_EFI_get_variable 6
+#define XEN_EFI_set_variable 7
+#define XEN_EFI_get_next_variable_name 8
+#define XEN_EFI_query_variable_info 9
+#define XEN_EFI_query_capsule_capabilities 10
+#define XEN_EFI_update_capsule 11
+
+struct xenpf_efi_runtime_call {
+ uint32_t function;
+ /*
+ * This field is generally used for per sub-function flags (defined
+ * below), except for the XEN_EFI_get_next_high_monotonic_count case,
+ * where it holds the single returned value.
+ */
+ uint32_t misc;
+ unsigned long status;
+ union {
+#define XEN_EFI_GET_TIME_SET_CLEARS_NS 0x00000001
+ struct {
+ struct xenpf_efi_time {
+ uint16_t year;
+ uint8_t month;
+ uint8_t day;
+ uint8_t hour;
+ uint8_t min;
+ uint8_t sec;
+ uint32_t ns;
+ int16_t tz;
+ uint8_t daylight;
+ } time;
+ uint32_t resolution;
+ uint32_t accuracy;
+ } get_time;
+
+ struct xenpf_efi_time set_time;
+
+#define XEN_EFI_GET_WAKEUP_TIME_ENABLED 0x00000001
+#define XEN_EFI_GET_WAKEUP_TIME_PENDING 0x00000002
+ struct xenpf_efi_time get_wakeup_time;
+
+#define XEN_EFI_SET_WAKEUP_TIME_ENABLE 0x00000001
+#define XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY 0x00000002
+ struct xenpf_efi_time set_wakeup_time;
+
+#define XEN_EFI_VARIABLE_NON_VOLATILE 0x00000001
+#define XEN_EFI_VARIABLE_BOOTSERVICE_ACCESS 0x00000002
+#define XEN_EFI_VARIABLE_RUNTIME_ACCESS 0x00000004
+ struct {
+ GUEST_HANDLE(void) name; /* UCS-2/UTF-16 string */
+ unsigned long size;
+ GUEST_HANDLE(void) data;
+ struct xenpf_efi_guid {
+ uint32_t data1;
+ uint16_t data2;
+ uint16_t data3;
+ uint8_t data4[8];
+ } vendor_guid;
+ } get_variable, set_variable;
+
+ struct {
+ unsigned long size;
+ GUEST_HANDLE(void) name; /* UCS-2/UTF-16 string */
+ struct xenpf_efi_guid vendor_guid;
+ } get_next_variable_name;
+
+ struct {
+ uint32_t attr;
+ uint64_t max_store_size;
+ uint64_t remain_store_size;
+ uint64_t max_size;
+ } query_variable_info;
+
+ struct {
+ GUEST_HANDLE(void) capsule_header_array;
+ unsigned long capsule_count;
+ uint64_t max_capsule_size;
+ unsigned int reset_type;
+ } query_capsule_capabilities;
+
+ struct {
+ GUEST_HANDLE(void) capsule_header_array;
+ unsigned long capsule_count;
+ uint64_t sg_list; /* machine address */
+ } update_capsule;
+ } u;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xenpf_efi_runtime_call);
+
+#define XEN_FW_EFI_VERSION 0
+#define XEN_FW_EFI_CONFIG_TABLE 1
+#define XEN_FW_EFI_VENDOR 2
+#define XEN_FW_EFI_MEM_INFO 3
+#define XEN_FW_EFI_RT_VERSION 4
+
#define XENPF_firmware_info 50
#define XEN_FW_DISK_INFO 1 /* from int 13 AH=08/41/48 */
#define XEN_FW_DISK_MBR_SIGNATURE 2 /* from MBR offset 0x1b8 */
#define XEN_FW_VBEDDC_INFO 3 /* from int 10 AX=4f15 */
+#define XEN_FW_EFI_INFO 4 /* from EFI */
+
struct xenpf_firmware_info {
/* IN variables. */
uint32_t type;
@@ -142,6 +244,25 @@ struct xenpf_firmware_info {
/* must refer to 128-byte buffer */
GUEST_HANDLE(uchar) edid;
} vbeddc_info; /* XEN_FW_VBEDDC_INFO */
+ union xenpf_efi_info {
+ uint32_t version;
+ struct {
+ uint64_t addr; /* EFI_CONFIGURATION_TABLE */
+ uint32_t nent;
+ } cfg;
+ struct {
+ uint32_t revision;
+ uint32_t bufsz; /* input, in bytes */
+ GUEST_HANDLE(void) name;
+ /* UCS-2/UTF-16 string */
+ } vendor;
+ struct {
+ uint64_t addr;
+ uint64_t size;
+ uint64_t attr;
+ uint32_t type;
+ } mem;
+ } efi_info; /* XEN_FW_EFI_INFO */
} u;
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_firmware_info_t);
@@ -307,6 +428,7 @@ struct xen_platform_op {
struct xenpf_read_memtype read_memtype;
struct xenpf_microcode_update microcode;
struct xenpf_platform_quirk platform_quirk;
+ struct xenpf_efi_runtime_call efi_runtime_call;
struct xenpf_firmware_info firmware_info;
struct xenpf_enter_acpi_sleep enter_acpi_sleep;
struct xenpf_change_freq change_freq;
--
1.7.7.5


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