diff options
Diffstat (limited to 'drivers/lguest')
| -rw-r--r-- | drivers/lguest/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/lguest/Makefile | 3 | ||||
| -rw-r--r-- | drivers/lguest/lguest_bus.c | 220 | ||||
| -rw-r--r-- | drivers/lguest/x86/core.c | 1 |
4 files changed, 0 insertions, 234 deletions
diff --git a/drivers/lguest/Kconfig b/drivers/lguest/Kconfig index 3ec5cc803a0..7eb9ecff8f4 100644 --- a/drivers/lguest/Kconfig +++ b/drivers/lguest/Kconfig @@ -17,13 +17,3 @@ config LGUEST_GUEST The guest needs code built-in, even if the host has lguest support as a module. The drivers are tiny, so we build them in too. - -config LGUEST_NET - tristate - default y - depends on LGUEST_GUEST && NET - -config LGUEST_BLOCK - tristate - default y - depends on LGUEST_GUEST && BLOCK diff --git a/drivers/lguest/Makefile b/drivers/lguest/Makefile index d330f5b8c45..8c28236ee1a 100644 --- a/drivers/lguest/Makefile +++ b/drivers/lguest/Makefile @@ -1,6 +1,3 @@ -# Guest requires the bus driver. -obj-$(CONFIG_LGUEST_GUEST) += lguest_bus.o - # Host requires the other files, which can be a module. obj-$(CONFIG_LGUEST) += lg.o lg-y = core.o hypercalls.o page_tables.o interrupts_and_traps.o \ diff --git a/drivers/lguest/lguest_bus.c b/drivers/lguest/lguest_bus.c deleted file mode 100644 index 2e9a202be44..00000000000 --- a/drivers/lguest/lguest_bus.c +++ /dev/null @@ -1,220 +0,0 @@ -/*P:050 Lguest guests use a very simple bus for devices. It's a simple array - * of device descriptors contained just above the top of normal memory. The - * lguest bus is 80% tedious boilerplate code. :*/ -#include <linux/init.h> -#include <linux/bootmem.h> -#include <linux/lguest_bus.h> -#include <asm/io.h> -#include <asm/paravirt.h> - -struct lguest_device_desc *lguest_devices; - -static ssize_t type_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%hu", lguest_devices[dev->index].type); -} -static ssize_t features_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%hx", lguest_devices[dev->index].features); -} -static ssize_t pfn_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%u", lguest_devices[dev->index].pfn); -} -static ssize_t status_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - return sprintf(buf, "%hx", lguest_devices[dev->index].status); -} -static ssize_t status_store(struct device *_dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - if (sscanf(buf, "%hi", &lguest_devices[dev->index].status) != 1) - return -EINVAL; - return count; -} -static struct device_attribute lguest_dev_attrs[] = { - __ATTR_RO(type), - __ATTR_RO(features), - __ATTR_RO(pfn), - __ATTR(status, 0644, status_show, status_store), - __ATTR_NULL -}; - -/*D:130 The generic bus infrastructure requires a function which says whether a - * device matches a driver. For us, it is simple: "struct lguest_driver" - * contains a "device_type" field which indicates what type of device it can - * handle, so we just cast the args and compare: */ -static int lguest_dev_match(struct device *_dev, struct device_driver *_drv) -{ - struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); - struct lguest_driver *drv = container_of(_drv,struct lguest_driver,drv); - - return (drv->device_type == lguest_devices[dev->index].type); -} -/*:*/ - -struct lguest_bus { - struct bus_type bus; - struct device dev; -}; - -static struct lguest_bus lguest_bus = { - .bus = { - .name = "lguest", - .match = lguest_dev_match, - .dev_attrs = lguest_dev_attrs, - }, - .dev = { - .parent = NULL, - .bus_id = "lguest", - } -}; - -/*D:140 This is the callback which occurs once the bus infrastructure matches - * up a device and driver, ie. in response to add_lguest_device() calling - * device_register(), or register_lguest_driver() calling driver_register(). - * - * At the moment it's always the latter: the devices are added first, since - * scan_devices() is called from a "core_initcall", and the drivers themselves - * called later as a normal "initcall". But it would work the other way too. - * - * So now we have the happy couple, we add the status bit to indicate that we - * found a driver. If the driver truly loves the device, it will return - * happiness from its probe function (ok, perhaps this wasn't my greatest - * analogy), and we set the final "driver ok" bit so the Host sees it's all - * green. */ -static int lguest_dev_probe(struct device *_dev) -{ - int ret; - struct lguest_device*dev = container_of(_dev,struct lguest_device,dev); - struct lguest_driver*drv = container_of(dev->dev.driver, - struct lguest_driver, drv); - - lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER; - ret = drv->probe(dev); - if (ret == 0) - lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER_OK; - return ret; -} - -/* The last part of the bus infrastructure is the function lguest drivers use - * to register themselves. Firstly, we do nothing if there's no lguest bus - * (ie. this is not a Guest), otherwise we fill in the embedded generic "struct - * driver" fields and call the generic driver_register(). */ -int register_lguest_driver(struct lguest_driver *drv) -{ - if (!lguest_devices) - return 0; - - drv->drv.bus = &lguest_bus.bus; - drv->drv.name = drv->name; - drv->drv.owner = drv->owner; - drv->drv.probe = lguest_dev_probe; - - return driver_register(&drv->drv); -} - -/* At the moment we build all the drivers into the kernel because they're so - * simple: 8144 bytes for all three of them as I type this. And as the console - * really needs to be built in, it's actually only 3527 bytes for the network - * and block drivers. - * - * If they get complex it will make sense for them to be modularized, so we - * need to explicitly export the symbol. - * - * I don't think non-GPL modules make sense, so it's a GPL-only export. - */ -EXPORT_SYMBOL_GPL(register_lguest_driver); - -/*D:120 This is the core of the lguest bus: actually adding a new device. - * It's a separate function because it's neater that way, and because an - * earlier version of the code supported hotplug and unplug. They were removed - * early on because they were never used. - * - * As Andrew Tridgell says, "Untested code is buggy code". - * - * It's worth reading this carefully: we start with an index into the array of - * "struct lguest_device_desc"s indicating the device which is new: */ -static void add_lguest_device(unsigned int index) -{ - struct lguest_device *new; - - /* Each "struct lguest_device_desc" has a "status" field, which the - * Guest updates as the device is probed. In the worst case, the Host - * can look at these bits to tell what part of device setup failed, - * even if the console isn't available. */ - lguest_devices[index].status |= LGUEST_DEVICE_S_ACKNOWLEDGE; - new = kmalloc(sizeof(struct lguest_device), GFP_KERNEL); - if (!new) { - printk(KERN_EMERG "Cannot allocate lguest device %u\n", index); - lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; - return; - } - - /* The "struct lguest_device" setup is pretty straight-forward example - * code. */ - new->index = index; - new->private = NULL; - memset(&new->dev, 0, sizeof(new->dev)); - new->dev.parent = &lguest_bus.dev; - new->dev.bus = &lguest_bus.bus; - sprintf(new->dev.bus_id, "%u", index); - - /* device_register() causes the bus infrastructure to look for a - * matching driver. */ - if (device_register(&new->dev) != 0) { - printk(KERN_EMERG "Cannot register lguest device %u\n", index); - lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; - kfree(new); - } -} - -/*D:110 scan_devices() simply iterates through the device array. The type 0 - * is reserved to mean "no device", and anything else means we have found a - * device: add it. */ -static void scan_devices(void) -{ - unsigned int i; - - for (i = 0; i < LGUEST_MAX_DEVICES; i++) - if (lguest_devices[i].type) - add_lguest_device(i); -} - -/*D:100 Fairly early in boot, lguest_bus_init() is called to set up the lguest - * bus. We check that we are a Guest by checking paravirt_ops.name: there are - * other ways of checking, but this seems most obvious to me. - * - * So we can access the array of "struct lguest_device_desc"s easily, we map - * that memory and store the pointer in the global "lguest_devices". Then we - * register the bus with the core. Doing two registrations seems clunky to me, - * but it seems to be the correct sysfs incantation. - * - * Finally we call scan_devices() which adds all the devices found in the - * "struct lguest_device_desc" array. */ -static int __init lguest_bus_init(void) -{ - if (strcmp(pv_info.name, "lguest") != 0) - return 0; - - /* Devices are in a single page above top of "normal" mem */ - lguest_devices = lguest_map(max_pfn<<PAGE_SHIFT, 1); - - if (bus_register(&lguest_bus.bus) != 0 - || device_register(&lguest_bus.dev) != 0) - panic("lguest bus registration failed"); - - scan_devices(); - return 0; -} -/* Do this after core stuff, before devices. */ -postcore_initcall(lguest_bus_init); diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 39f64c95de1..ef976ccb419 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -29,7 +29,6 @@ #include <linux/cpu.h> #include <linux/lguest.h> #include <linux/lguest_launcher.h> -#include <linux/lguest_bus.h> #include <asm/paravirt.h> #include <asm/param.h> #include <asm/page.h> |