[Qemu-devel] [PATCH 09/18] qdev: Add a pre-firmware init capability

[minyard@acm.org]

From: Corey Minyard <cminyard@mvista.com>

Some devices may need to do some firmware-type initialization before
the firmware itself is initialized.  For instance, any device that
adds SMBIOS table entries (like IPMI) will need to do that before
the BIOS is initialized.

So add a list of devices that get initialized before the firmware
initialization.  Since those devices get removed from the list so
they don't get initialized twice, convert the qemu_opt_foreach() to
use the safe list traversal.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
 hw/pc.c           |    2 ++
 hw/qdev-monitor.c |   52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/qdev.h         |    3 +++
 qemu-option.c     |    4 ++--
 4 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index bedd5be..811d99c 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1010,6 +1010,8 @@ void *pc_bios_init(const char *kernel_filename,
     void *fw_cfg;
     int linux_boot, i;
 
+    qdev_prefw_init_check();
+
     /* Initialize PC system firmware */
     pc_system_firmware_init(rom_memory);
 
diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
index 7915b45..bb8e955 100644
--- a/hw/qdev-monitor.c
+++ b/hw/qdev-monitor.c
@@ -486,6 +486,58 @@ DeviceState *qdev_device_add(QemuOpts *opts)
     return qdev;
 }
 
+/*
+ * Some devices may need to be initialized before the firmware is
+ * initialized, so they may add information to the firmware
+ * structures.
+ */
+typedef struct prefw_list {
+    const char *name;
+    struct prefw_list *next;
+} prefw_list;
+
+prefw_list *prefw_init;
+
+void qdev_add_prefw_init(const char *name)
+{
+    prefw_list *e = g_malloc(sizeof(*e));
+    e->name = name;
+    e->next = prefw_init;
+    prefw_init = e;
+}
+
+static int prefw_check_func(QemuOpts *opts, void *opaque)
+{
+    DeviceState *dev;
+    const char *driver;
+    prefw_list *e;
+
+    driver = qemu_opt_get(opts, "driver");
+    if (!driver) {
+        return 0;
+    }
+
+    for (e = prefw_init; e; e = e->next) {
+        if (strcmp(driver, e->name) == 0) {
+            dev = qdev_device_add(opts);
+            if (!dev) {
+                return -1;
+            }
+            qemu_opts_del(opts);
+            break;
+        }
+    }
+    return 0;
+}
+
+void qdev_prefw_init_check(void)
+{
+    /* init generic devices */
+    if (qemu_opts_foreach(qemu_find_opts("device"),
+                          prefw_check_func, NULL, 1) != 0) {
+        exit(1);
+    }
+}
 
 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 static void qbus_print(Monitor *mon, BusState *bus, int indent);
diff --git a/hw/qdev.h b/hw/qdev.h
index f4683dc..2be4c95 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -167,6 +167,9 @@ int qdev_simple_unplug_cb(DeviceState *dev);
 void qdev_machine_creation_done(void);
 bool qdev_machine_modified(void);
 
+void qdev_add_prefw_init(const char *name);
+void qdev_prefw_init_check(void);
+
 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
 
diff --git a/qemu-option.c b/qemu-option.c
index bb3886c..1d000f8 100644
--- a/qemu-option.c
+++ b/qemu-option.c
@@ -709,10 +709,10 @@ int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
                      int abort_on_failure)
 {
-    QemuOpt *opt;
+    QemuOpt *opt, *next_opt;
     int rc = 0;
 
-    QTAILQ_FOREACH(opt, &opts->head, next) {
+    QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
         rc = func(opt->name, opt->str, opaque);
         if (abort_on_failure  &&  rc != 0)
             break;
-- 
1.7.4.1