#include <linux/clockchips.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>
}
/*:*/
-/* Wrappers for the SEND_DMA and BIND_DMA hypercalls. This is mainly because
- * Jeff Garzik complained that __pa() should never appear in drivers, and this
- * helps remove most of them. But also, it wraps some ugliness. */
-void lguest_send_dma(unsigned long key, struct lguest_dma *dma)
-{
- /* The hcall might not write this if something goes wrong */
- dma->used_len = 0;
- hcall(LHCALL_SEND_DMA, key, __pa(dma), 0);
-}
-
-int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
- unsigned int num, u8 irq)
-{
- /* This is the only hypercall which actually wants 5 arguments, and we
- * only support 4. Fortunately the interrupt number is always less
- * than 256, so we can pack it with the number of dmas in the final
- * argument. */
- if (!hcall(LHCALL_BIND_DMA, key, __pa(dmas), (num << 8) | irq))
- return -ENOMEM;
- return 0;
-}
-
-/* Unbinding is the same hypercall as binding, but with 0 num & irq. */
-void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas)
-{
- hcall(LHCALL_BIND_DMA, key, __pa(dmas), 0);
-}
-
-/* For guests, device memory can be used as normal memory, so we cast away the
- * __iomem to quieten sparse. */
-void *lguest_map(unsigned long phys_addr, unsigned long pages)
-{
- return (__force void *)ioremap(phys_addr, PAGE_SIZE*pages);
-}
-
-void lguest_unmap(void *addr)
-{
- iounmap((__force void __iomem *)addr);
-}
-
/*G:033
* Here are our first native-instruction replacements: four functions for
* interrupt control.
obj-$(CONFIG_BLK_DEV_UB) += ub.o
obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += xen-blkfront.o
-obj-$(CONFIG_LGUEST_BLOCK) += lguest_blk.o
+++ /dev/null
-/*D:400
- * The Guest block driver
- *
- * This is a simple block driver, which appears as /dev/lgba, lgbb, lgbc etc.
- * The mechanism is simple: we place the information about the request in the
- * device page, then use SEND_DMA (containing the data for a write, or an empty
- * "ping" DMA for a read).
- :*/
-/* Copyright 2006 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-//#define DEBUG
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/blkdev.h>
-#include <linux/interrupt.h>
-#include <linux/lguest_bus.h>
-
-static char next_block_index = 'a';
-
-/*D:420 Here is the structure which holds all the information we need about
- * each Guest block device.
- *
- * I'm sure at this stage, you're wondering "hey, where was the adventure I was
- * promised?" and thinking "Rusty sucks, I shall say nasty things about him on
- * my blog". I think Real adventures have boring bits, too, and you're in the
- * middle of one. But it gets better. Just not quite yet. */
-struct blockdev
-{
- /* The block queue infrastructure wants a spinlock: it is held while it
- * calls our block request function. We grab it in our interrupt
- * handler so the responses don't mess with new requests. */
- spinlock_t lock;
-
- /* The disk structure registered with kernel. */
- struct gendisk *disk;
-
- /* The major device number for this disk, and the interrupt. We only
- * really keep them here for completeness; we'd need them if we
- * supported device unplugging. */
- int major;
- int irq;
-
- /* The physical address of this device's memory page */
- unsigned long phys_addr;
- /* The mapped memory page for convenient acces. */
- struct lguest_block_page *lb_page;
-
- /* We only have a single request outstanding at a time: this is it. */
- struct lguest_dma dma;
- struct request *req;
-};
-
-/*D:495 We originally used end_request() throughout the driver, but it turns
- * out that end_request() is deprecated, and doesn't actually end the request
- * (which seems like a good reason to deprecate it!). It simply ends the first
- * bio. So if we had 3 bios in a "struct request" we would do all 3,
- * end_request(), do 2, end_request(), do 1 and end_request(): twice as much
- * work as we needed to do.
- *
- * This reinforced to me that I do not understand the block layer.
- *
- * Nonetheless, Jens Axboe gave me this nice helper to end all chunks of a
- * request. This improved disk speed by 130%. */
-static void end_entire_request(struct request *req, int uptodate)
-{
- if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
- BUG();
- add_disk_randomness(req->rq_disk);
- blkdev_dequeue_request(req);
- end_that_request_last(req, uptodate);
-}
-
-/* I'm told there are only two stories in the world worth telling: love and
- * hate. So there used to be a love scene here like this:
- *
- * Launcher: We could make beautiful I/O together, you and I.
- * Guest: My, that's a big disk!
- *
- * Unfortunately, it was just too raunchy for our otherwise-gentle tale. */
-
-/*D:490 This is the interrupt handler, called when a block read or write has
- * been completed for us. */
-static irqreturn_t lgb_irq(int irq, void *_bd)
-{
- /* We handed our "struct blockdev" as the argument to request_irq(), so
- * it is passed through to us here. This tells us which device we're
- * dealing with in case we have more than one. */
- struct blockdev *bd = _bd;
- unsigned long flags;
-
- /* We weren't doing anything? Strange, but could happen if we shared
- * interrupts (we don't!). */
- if (!bd->req) {
- pr_debug("No work!\n");
- return IRQ_NONE;
- }
-
- /* Not done yet? That's equally strange. */
- if (!bd->lb_page->result) {
- pr_debug("No result!\n");
- return IRQ_NONE;
- }
-
- /* We have to grab the lock before ending the request. */
- spin_lock_irqsave(&bd->lock, flags);
- /* "result" is 1 for success, 2 for failure: end_entire_request() wants
- * to know whether this succeeded or not. */
- end_entire_request(bd->req, bd->lb_page->result == 1);
- /* Clear out request, it's done. */
- bd->req = NULL;
- /* Reset incoming DMA for next time. */
- bd->dma.used_len = 0;
- /* Ready for more reads or writes */
- blk_start_queue(bd->disk->queue);
- spin_unlock_irqrestore(&bd->lock, flags);
-
- /* The interrupt was for us, we dealt with it. */
- return IRQ_HANDLED;
-}
-
-/*D:480 The block layer's "struct request" contains a number of "struct bio"s,
- * each of which contains "struct bio_vec"s, each of which contains a page, an
- * offset and a length.
- *
- * Fortunately there are iterators to help us walk through the "struct
- * request". Even more fortunately, there were plenty of places to steal the
- * code from. We pack the "struct request" into our "struct lguest_dma" and
- * return the total length. */
-static unsigned int req_to_dma(struct request *req, struct lguest_dma *dma)
-{
- unsigned int i = 0, len = 0;
- struct req_iterator iter;
- struct bio_vec *bvec;
-
- rq_for_each_segment(bvec, req, iter) {
- /* We told the block layer not to give us too many. */
- BUG_ON(i == LGUEST_MAX_DMA_SECTIONS);
- /* If we had a zero-length segment, it would look like
- * the end of the data referred to by the "struct
- * lguest_dma", so make sure that doesn't happen. */
- BUG_ON(!bvec->bv_len);
- /* Convert page & offset to a physical address */
- dma->addr[i] = page_to_phys(bvec->bv_page)
- + bvec->bv_offset;
- dma->len[i] = bvec->bv_len;
- len += bvec->bv_len;
- i++;
- }
- /* If the array isn't full, we mark the end with a 0 length */
- if (i < LGUEST_MAX_DMA_SECTIONS)
- dma->len[i] = 0;
- return len;
-}
-
-/* This creates an empty DMA, useful for prodding the Host without sending data
- * (ie. when we want to do a read) */
-static void empty_dma(struct lguest_dma *dma)
-{
- dma->len[0] = 0;
-}
-
-/*D:470 Setting up a request is fairly easy: */
-static void setup_req(struct blockdev *bd,
- int type, struct request *req, struct lguest_dma *dma)
-{
- /* The type is 1 (write) or 0 (read). */
- bd->lb_page->type = type;
- /* The sector on disk where the read or write starts. */
- bd->lb_page->sector = req->sector;
- /* The result is initialized to 0 (unfinished). */
- bd->lb_page->result = 0;
- /* The current request (so we can end it in the interrupt handler). */
- bd->req = req;
- /* The number of bytes: returned as a side-effect of req_to_dma(),
- * which packs the block layer's "struct request" into our "struct
- * lguest_dma" */
- bd->lb_page->bytes = req_to_dma(req, dma);
-}
-
-/*D:450 Write is pretty straightforward: we pack the request into a "struct
- * lguest_dma", then use SEND_DMA to send the request. */
-static void do_write(struct blockdev *bd, struct request *req)
-{
- struct lguest_dma send;
-
- pr_debug("lgb: WRITE sector %li\n", (long)req->sector);
- setup_req(bd, 1, req, &send);
-
- lguest_send_dma(bd->phys_addr, &send);
-}
-
-/* Read is similar to write, except we pack the request into our receive
- * "struct lguest_dma" and send through an empty DMA just to tell the Host that
- * there's a request pending. */
-static void do_read(struct blockdev *bd, struct request *req)
-{
- struct lguest_dma ping;
-
- pr_debug("lgb: READ sector %li\n", (long)req->sector);
- setup_req(bd, 0, req, &bd->dma);
-
- empty_dma(&ping);
- lguest_send_dma(bd->phys_addr, &ping);
-}
-
-/*D:440 This where requests come in: we get handed the request queue and are
- * expected to pull a "struct request" off it until we've finished them or
- * we're waiting for a reply: */
-static void do_lgb_request(struct request_queue *q)
-{
- struct blockdev *bd;
- struct request *req;
-
-again:
- /* This sometimes returns NULL even on the very first time around. I
- * wonder if it's something to do with letting elves handle the request
- * queue... */
- req = elv_next_request(q);
- if (!req)
- return;
-
- /* We attached the struct blockdev to the disk: get it back */
- bd = req->rq_disk->private_data;
- /* Sometimes we get repeated requests after blk_stop_queue(), but we
- * can only handle one at a time. */
- if (bd->req)
- return;
-
- /* We only do reads and writes: no tricky business! */
- if (!blk_fs_request(req)) {
- pr_debug("Got non-command 0x%08x\n", req->cmd_type);
- req->errors++;
- end_entire_request(req, 0);
- goto again;
- }
-
- if (rq_data_dir(req) == WRITE)
- do_write(bd, req);
- else
- do_read(bd, req);
-
- /* We've put out the request, so stop any more coming in until we get
- * an interrupt, which takes us to lgb_irq() to re-enable the queue. */
- blk_stop_queue(q);
-}
-
-/*D:430 This is the "struct block_device_operations" we attach to the disk at
- * the end of lguestblk_probe(). It doesn't seem to want much. */
-static struct block_device_operations lguestblk_fops = {
- .owner = THIS_MODULE,
-};
-
-/*D:425 Setting up a disk device seems to involve a lot of code. I'm not sure
- * quite why. I do know that the IDE code sent two or three of the maintainers
- * insane, perhaps this is the fringe of the same disease?
- *
- * As in the console code, the probe function gets handed the generic
- * lguest_device from lguest_bus.c: */
-static int lguestblk_probe(struct lguest_device *lgdev)
-{
- struct blockdev *bd;
- int err;
- int irqflags = IRQF_SHARED;
-
- /* First we allocate our own "struct blockdev" and initialize the easy
- * fields. */
- bd = kmalloc(sizeof(*bd), GFP_KERNEL);
- if (!bd)
- return -ENOMEM;
-
- spin_lock_init(&bd->lock);
- bd->irq = lgdev_irq(lgdev);
- bd->req = NULL;
- bd->dma.used_len = 0;
- bd->dma.len[0] = 0;
- /* The descriptor in the lguest_devices array provided by the Host
- * gives the Guest the physical page number of the device's page. */
- bd->phys_addr = (lguest_devices[lgdev->index].pfn << PAGE_SHIFT);
-
- /* We use lguest_map() to get a pointer to the device page */
- bd->lb_page = lguest_map(bd->phys_addr, 1);
- if (!bd->lb_page) {
- err = -ENOMEM;
- goto out_free_bd;
- }
-
- /* We need a major device number: 0 means "assign one dynamically". */
- bd->major = register_blkdev(0, "lguestblk");
- if (bd->major < 0) {
- err = bd->major;
- goto out_unmap;
- }
-
- /* This allocates a "struct gendisk" where we pack all the information
- * about the disk which the rest of Linux sees. The argument is the
- * number of minor devices desired: we need one minor for the main
- * disk, and one for each partition. Of course, we can't possibly know
- * how many partitions are on the disk (add_disk does that).
- */
- bd->disk = alloc_disk(16);
- if (!bd->disk) {
- err = -ENOMEM;
- goto out_unregister_blkdev;
- }
-
- /* Every disk needs a queue for requests to come in: we set up the
- * queue with a callback function (the core of our driver) and the lock
- * to use. */
- bd->disk->queue = blk_init_queue(do_lgb_request, &bd->lock);
- if (!bd->disk->queue) {
- err = -ENOMEM;
- goto out_put_disk;
- }
-
- /* We can only handle a certain number of pointers in our SEND_DMA
- * call, so we set that with blk_queue_max_hw_segments(). This is not
- * to be confused with blk_queue_max_phys_segments() of course! I
- * know, who could possibly confuse the two?
- *
- * Well, it's simple to tell them apart: this one seems to work and the
- * other one didn't. */
- blk_queue_max_hw_segments(bd->disk->queue, LGUEST_MAX_DMA_SECTIONS);
-
- /* Due to technical limitations of our Host (and simple coding) we
- * can't have a single buffer which crosses a page boundary. Tell it
- * here. This means that our maximum request size is 16
- * (LGUEST_MAX_DMA_SECTIONS) pages. */
- blk_queue_segment_boundary(bd->disk->queue, PAGE_SIZE-1);
-
- /* We name our disk: this becomes the device name when udev does its
- * magic thing and creates the device node, such as /dev/lgba.
- * next_block_index is a global which starts at 'a'. Unfortunately
- * this simple increment logic means that the 27th disk will be called
- * "/dev/lgb{". In that case, I recommend having at least 29 disks, so
- * your /dev directory will be balanced. */
- sprintf(bd->disk->disk_name, "lgb%c", next_block_index++);
-
- /* We look to the device descriptor again to see if this device's
- * interrupts are expected to be random. If they are, we tell the irq
- * subsystem. At the moment this bit is always set. */
- if (lguest_devices[lgdev->index].features & LGUEST_DEVICE_F_RANDOMNESS)
- irqflags |= IRQF_SAMPLE_RANDOM;
-
- /* Now we have the name and irqflags, we can request the interrupt; we
- * give it the "struct blockdev" we have set up to pass to lgb_irq()
- * when there is an interrupt. */
- err = request_irq(bd->irq, lgb_irq, irqflags, bd->disk->disk_name, bd);
- if (err)
- goto out_cleanup_queue;
-
- /* We bind our one-entry DMA pool to the key for this block device so
- * the Host can reply to our requests. The key is equal to the
- * physical address of the device's page, which is conveniently
- * unique. */
- err = lguest_bind_dma(bd->phys_addr, &bd->dma, 1, bd->irq);
- if (err)
- goto out_free_irq;
-
- /* We finish our disk initialization and add the disk to the system. */
- bd->disk->major = bd->major;
- bd->disk->first_minor = 0;
- bd->disk->private_data = bd;
- bd->disk->fops = &lguestblk_fops;
- /* This is initialized to the disk size by the Launcher. */
- set_capacity(bd->disk, bd->lb_page->num_sectors);
- add_disk(bd->disk);
-
- printk(KERN_INFO "%s: device %i at major %d\n",
- bd->disk->disk_name, lgdev->index, bd->major);
-
- /* We don't need to keep the "struct blockdev" around, but if we ever
- * implemented device removal, we'd need this. */
- lgdev->private = bd;
- return 0;
-
-out_free_irq:
- free_irq(bd->irq, bd);
-out_cleanup_queue:
- blk_cleanup_queue(bd->disk->queue);
-out_put_disk:
- put_disk(bd->disk);
-out_unregister_blkdev:
- unregister_blkdev(bd->major, "lguestblk");
-out_unmap:
- lguest_unmap(bd->lb_page);
-out_free_bd:
- kfree(bd);
- return err;
-}
-
-/*D:410 The boilerplate code for registering the lguest block driver is just
- * like the console: */
-static struct lguest_driver lguestblk_drv = {
- .name = "lguestblk",
- .owner = THIS_MODULE,
- .device_type = LGUEST_DEVICE_T_BLOCK,
- .probe = lguestblk_probe,
-};
-
-static __init int lguestblk_init(void)
-{
- return register_lguest_driver(&lguestblk_drv);
-}
-module_init(lguestblk_init);
-
-MODULE_DESCRIPTION("Lguest block driver");
-MODULE_LICENSE("GPL");
obj-$(CONFIG_N_HDLC) += n_hdlc.o
obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
obj-$(CONFIG_SX) += sx.o generic_serial.o
-obj-$(CONFIG_LGUEST_GUEST) += hvc_lguest.o
obj-$(CONFIG_RIO) += rio/ generic_serial.o
obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
+++ /dev/null
-/*D:300
- * The Guest console driver
- *
- * This is a trivial console driver: we use lguest's DMA mechanism to send
- * bytes out, and register a DMA buffer to receive bytes in. It is assumed to
- * be present and available from the very beginning of boot.
- *
- * Writing console drivers is one of the few remaining Dark Arts in Linux.
- * Fortunately for us, the path of virtual consoles has been well-trodden by
- * the PowerPC folks, who wrote "hvc_console.c" to generically support any
- * virtual console. We use that infrastructure which only requires us to write
- * the basic put_chars and get_chars functions and call the right register
- * functions.
- :*/
-
-/*M:002 The console can be flooded: while the Guest is processing input the
- * Host can send more. Buffering in the Host could alleviate this, but it is a
- * difficult problem in general. :*/
-/* Copyright (C) 2006 Rusty Russell, IBM Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/lguest_bus.h>
-#include <asm/paravirt.h>
-#include "hvc_console.h"
-
-/*D:340 This is our single console input buffer, with associated "struct
- * lguest_dma" referring to it. Note the 0-terminated length array, and the
- * use of physical address for the buffer itself. */
-static char inbuf[256];
-static struct lguest_dma cons_input = { .used_len = 0,
- .addr[0] = __pa(inbuf),
- .len[0] = sizeof(inbuf),
- .len[1] = 0 };
-
-/*D:310 The put_chars() callback is pretty straightforward.
- *
- * First we put the pointer and length in a "struct lguest_dma": we only have
- * one pointer, so we set the second length to 0. Then we use SEND_DMA to send
- * the data to (Host) buffers attached to the console key. Usually a device's
- * key is a physical address within the device's memory, but because the
- * console device doesn't have any associated physical memory, we use the
- * LGUEST_CONSOLE_DMA_KEY constant (aka 0). */
-static int put_chars(u32 vtermno, const char *buf, int count)
-{
- struct lguest_dma dma;
-
- /* FIXME: DMA buffers in a "struct lguest_dma" are not allowed
- * to go over page boundaries. This never seems to happen,
- * but if it did we'd need to fix this code. */
- dma.len[0] = count;
- dma.len[1] = 0;
- dma.addr[0] = __pa(buf);
-
- lguest_send_dma(LGUEST_CONSOLE_DMA_KEY, &dma);
- /* We're expected to return the amount of data we wrote: all of it. */
- return count;
-}
-
-/*D:350 get_chars() is the callback from the hvc_console infrastructure when
- * an interrupt is received.
- *
- * Firstly we see if our buffer has been filled: if not, we return. The rest
- * of the code deals with the fact that the hvc_console() infrastructure only
- * asks us for 16 bytes at a time. We keep a "cons_offset" variable for
- * partially-read buffers. */
-static int get_chars(u32 vtermno, char *buf, int count)
-{
- static int cons_offset;
-
- /* Nothing left to see here... */
- if (!cons_input.used_len)
- return 0;
-
- /* You want more than we have to give? Well, try wanting less! */
- if (cons_input.used_len - cons_offset < count)
- count = cons_input.used_len - cons_offset;
-
- /* Copy across to their buffer and increment offset. */
- memcpy(buf, inbuf + cons_offset, count);
- cons_offset += count;
-
- /* Finished? Zero offset, and reset cons_input so Host will use it
- * again. */
- if (cons_offset == cons_input.used_len) {
- cons_offset = 0;
- cons_input.used_len = 0;
- }
- return count;
-}
-/*:*/
-
-static struct hv_ops lguest_cons = {
- .get_chars = get_chars,
- .put_chars = put_chars,
-};
-
-/*D:320 Console drivers are initialized very early so boot messages can go
- * out. At this stage, the console is output-only. Our driver checks we're a
- * Guest, and if so hands hvc_instantiate() the console number (0), priority
- * (0), and the struct hv_ops containing the put_chars() function. */
-static int __init cons_init(void)
-{
- if (strcmp(pv_info.name, "lguest") != 0)
- return 0;
-
- return hvc_instantiate(0, 0, &lguest_cons);
-}
-console_initcall(cons_init);
-
-/*D:370 To set up and manage our virtual console, we call hvc_alloc() and
- * stash the result in the private pointer of the "struct lguest_device".
- * Since we never remove the console device we never need this pointer again,
- * but using ->private is considered good form, and you never know who's going
- * to copy your driver.
- *
- * Once the console is set up, we bind our input buffer ready for input. */
-static int lguestcons_probe(struct lguest_device *lgdev)
-{
- int err;
-
- /* The first argument of hvc_alloc() is the virtual console number, so
- * we use zero. The second argument is the interrupt number.
- *
- * The third argument is a "struct hv_ops" containing the put_chars()
- * and get_chars() pointers. The final argument is the output buffer
- * size: we use 256 and expect the Host to have room for us to send
- * that much. */
- lgdev->private = hvc_alloc(0, lgdev_irq(lgdev), &lguest_cons, 256);
- if (IS_ERR(lgdev->private))
- return PTR_ERR(lgdev->private);
-
- /* We bind a single DMA buffer at key LGUEST_CONSOLE_DMA_KEY.
- * "cons_input" is that statically-initialized global DMA buffer we saw
- * above, and we also give the interrupt we want. */
- err = lguest_bind_dma(LGUEST_CONSOLE_DMA_KEY, &cons_input, 1,
- lgdev_irq(lgdev));
- if (err)
- printk("lguest console: failed to bind buffer.\n");
- return err;
-}
-/* Note the use of lgdev_irq() for the interrupt number. We tell hvc_alloc()
- * to expect input when this interrupt is triggered, and then tell
- * lguest_bind_dma() that is the interrupt to send us when input comes in. */
-
-/*D:360 From now on the console driver follows standard Guest driver form:
- * register_lguest_driver() registers the device type and probe function, and
- * the probe function sets up the device.
- *
- * The standard "struct lguest_driver": */
-static struct lguest_driver lguestcons_drv = {
- .name = "lguestcons",
- .owner = THIS_MODULE,
- .device_type = LGUEST_DEVICE_T_CONSOLE,
- .probe = lguestcons_probe,
-};
-
-/* The standard init function */
-static int __init hvc_lguest_init(void)
-{
- return register_lguest_driver(&lguestcons_drv);
-}
-module_init(hvc_lguest_init);
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
-# 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 \
+++ /dev/null
-/*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);
#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>
obj-$(CONFIG_HPLANCE) += hplance.o 7990.o
obj-$(CONFIG_MVME147_NET) += mvme147.o 7990.o
obj-$(CONFIG_EQUALIZER) += eql.o
-obj-$(CONFIG_LGUEST_NET) += lguest_net.o
obj-$(CONFIG_MIPS_JAZZ_SONIC) += jazzsonic.o
obj-$(CONFIG_MIPS_AU1X00_ENET) += au1000_eth.o
obj-$(CONFIG_MIPS_SIM_NET) += mipsnet.o
+++ /dev/null
-/*D:500
- * The Guest network driver.
- *
- * This is very simple a virtual network driver, and our last Guest driver.
- * The only trick is that it can talk directly to multiple other recipients
- * (ie. other Guests on the same network). It can also be used with only the
- * Host on the network.
- :*/
-
-/* Copyright 2006 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-//#define DEBUG
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/module.h>
-#include <linux/mm_types.h>
-#include <linux/io.h>
-#include <linux/lguest_bus.h>
-
-#define SHARED_SIZE PAGE_SIZE
-#define MAX_LANS 4
-#define NUM_SKBS 8
-
-/*M:011 Network code master Jeff Garzik points out numerous shortcomings in
- * this driver if it aspires to greatness.
- *
- * Firstly, it doesn't use "NAPI": the networking's New API, and is poorer for
- * it. As he says "NAPI means system-wide load leveling, across multiple
- * network interfaces. Lack of NAPI can mean competition at higher loads."
- *
- * He also points out that we don't implement set_mac_address, so users cannot
- * change the devices hardware address. When I asked why one would want to:
- * "Bonding, and situations where you /do/ want the MAC address to "leak" out
- * of the host onto the wider net."
- *
- * Finally, he would like module unloading: "It is not unrealistic to think of
- * [un|re|]loading the net support module in an lguest guest. And, adding
- * module support makes the programmer more responsible, because they now have
- * to learn to clean up after themselves. Any driver that cannot clean up
- * after itself is an incomplete driver in my book."
- :*/
-
-/*D:530 The "struct lguestnet_info" contains all the information we need to
- * know about the network device. */
-struct lguestnet_info
-{
- /* The mapped device page(s) (an array of "struct lguest_net"). */
- struct lguest_net *peer;
- /* The physical address of the device page(s) */
- unsigned long peer_phys;
- /* The size of the device page(s). */
- unsigned long mapsize;
-
- /* The lguest_device I come from */
- struct lguest_device *lgdev;
-
- /* My peerid (ie. my slot in the array). */
- unsigned int me;
-
- /* Receive queue: the network packets waiting to be filled. */
- struct sk_buff *skb[NUM_SKBS];
- struct lguest_dma dma[NUM_SKBS];
-};
-/*:*/
-
-/* How many bytes left in this page. */
-static unsigned int rest_of_page(void *data)
-{
- return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE);
-}
-
-/*D:570 Each peer (ie. Guest or Host) on the network binds their receive
- * buffers to a different key: we simply use the physical address of the
- * device's memory page plus the peer number. The Host insists that all keys
- * be a multiple of 4, so we multiply the peer number by 4. */
-static unsigned long peer_key(struct lguestnet_info *info, unsigned peernum)
-{
- return info->peer_phys + 4 * peernum;
-}
-
-/* This is the routine which sets up a "struct lguest_dma" to point to a
- * network packet, similar to req_to_dma() in lguest_blk.c. The structure of a
- * "struct sk_buff" has grown complex over the years: it consists of a "head"
- * linear section pointed to by "skb->data", and possibly an array of
- * "fragments" in the case of a non-linear packet.
- *
- * Our receive buffers don't use fragments at all but outgoing skbs might, so
- * we handle it. */
-static void skb_to_dma(const struct sk_buff *skb, unsigned int headlen,
- struct lguest_dma *dma)
-{
- unsigned int i, seg;
-
- /* First, we put the linear region into the "struct lguest_dma". Each
- * entry can't go over a page boundary, so even though all our packets
- * are 1514 bytes or less, we might need to use two entries here: */
- for (i = seg = 0; i < headlen; seg++, i += rest_of_page(skb->data+i)) {
- dma->addr[seg] = virt_to_phys(skb->data + i);
- dma->len[seg] = min((unsigned)(headlen - i),
- rest_of_page(skb->data + i));
- }
-
- /* Now we handle the fragments: at least they're guaranteed not to go
- * over a page. skb_shinfo(skb) returns a pointer to the structure
- * which tells us about the number of fragments and the fragment
- * array. */
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++, seg++) {
- const skb_frag_t *f = &skb_shinfo(skb)->frags[i];
- /* Should not happen with MTU less than 64k - 2 * PAGE_SIZE. */
- if (seg == LGUEST_MAX_DMA_SECTIONS) {
- /* We will end up sending a truncated packet should
- * this ever happen. Plus, a cool log message! */
- printk("Woah dude! Megapacket!\n");
- break;
- }
- dma->addr[seg] = page_to_phys(f->page) + f->page_offset;
- dma->len[seg] = f->size;
- }
-
- /* If after all that we didn't use the entire "struct lguest_dma"
- * array, we terminate it with a 0 length. */
- if (seg < LGUEST_MAX_DMA_SECTIONS)
- dma->len[seg] = 0;
-}
-
-/*
- * Packet transmission.
- *
- * Our packet transmission is a little unusual. A real network card would just
- * send out the packet and leave the receivers to decide if they're interested.
- * Instead, we look through the network device memory page and see if any of
- * the ethernet addresses match the packet destination, and if so we send it to
- * that Guest.
- *
- * This is made a little more complicated in two cases. The first case is
- * broadcast packets: for that we send the packet to all Guests on the network,
- * one at a time. The second case is "promiscuous" mode, where a Guest wants
- * to see all the packets on the network. We need a way for the Guest to tell
- * us it wants to see all packets, so it sets the "multicast" bit on its
- * published MAC address, which is never valid in a real ethernet address.
- */
-#define PROMISC_BIT 0x01
-
-/* This is the callback which is summoned whenever the network device's
- * multicast or promiscuous state changes. If the card is in promiscuous mode,
- * we advertise that in our ethernet address in the device's memory. We do the
- * same if Linux wants any or all multicast traffic. */
-static void lguestnet_set_multicast(struct net_device *dev)
-{
- struct lguestnet_info *info = netdev_priv(dev);
-
- if ((dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) || dev->mc_count)
- info->peer[info->me].mac[0] |= PROMISC_BIT;
- else
- info->peer[info->me].mac[0] &= ~PROMISC_BIT;
-}
-
-/* A simple test function to see if a peer wants to see all packets.*/
-static int promisc(struct lguestnet_info *info, unsigned int peer)
-{
- return info->peer[peer].mac[0] & PROMISC_BIT;
-}
-
-/* Another simple function to see if a peer's advertised ethernet address
- * matches a packet's destination ethernet address. */
-static int mac_eq(const unsigned char mac[ETH_ALEN],
- struct lguestnet_info *info, unsigned int peer)
-{
- /* Ignore multicast bit, which peer turns on to mean promisc. */
- if ((info->peer[peer].mac[0] & (~PROMISC_BIT)) != mac[0])
- return 0;
- return memcmp(mac+1, info->peer[peer].mac+1, ETH_ALEN-1) == 0;
-}
-
-/* This is the function which actually sends a packet once we've decided a
- * peer wants it: */
-static void transfer_packet(struct net_device *dev,
- struct sk_buff *skb,
- unsigned int peernum)
-{
- struct lguestnet_info *info = netdev_priv(dev);
- struct lguest_dma dma;
-
- /* We use our handy "struct lguest_dma" packing function to prepare
- * the skb for sending. */
- skb_to_dma(skb, skb_headlen(skb), &dma);
- pr_debug("xfer length %04x (%u)\n", htons(skb->len), skb->len);
-
- /* This is the actual send call which copies the packet. */
- lguest_send_dma(peer_key(info, peernum), &dma);
-
- /* Check that the entire packet was transmitted. If not, it could mean
- * that the other Guest registered a short receive buffer, but this
- * driver should never do that. More likely, the peer is dead. */
- if (dma.used_len != skb->len) {
- dev->stats.tx_carrier_errors++;
- pr_debug("Bad xfer to peer %i: %i of %i (dma %p/%i)\n",
- peernum, dma.used_len, skb->len,
- (void *)dma.addr[0], dma.len[0]);
- } else {
- /* On success we update the stats. */
- dev->stats.tx_bytes += skb->len;
- dev->stats.tx_packets++;
- }
-}
-
-/* Another helper function to tell is if a slot in the device memory is unused.
- * Since we always set the Local Assignment bit in the ethernet address, the
- * first byte can never be 0. */
-static int unused_peer(const struct lguest_net peer[], unsigned int num)
-{
- return peer[num].mac[0] == 0;
-}
-
-/* Finally, here is the routine which handles an outgoing packet. It's called
- * "start_xmit" for traditional reasons. */
-static int lguestnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- unsigned int i;
- int broadcast;
- struct lguestnet_info *info = netdev_priv(dev);
- /* Extract the destination ethernet address from the packet. */
- const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
- DECLARE_MAC_BUF(mac);
-
- pr_debug("%s: xmit %s\n", dev->name, print_mac(mac, dest));
-
- /* If it's a multicast packet, we broadcast to everyone. That's not
- * very efficient, but there are very few applications which actually
- * use multicast, which is a shame really.
- *
- * As etherdevice.h points out: "By definition the broadcast address is
- * also a multicast address." So we don't have to test for broadcast
- * packets separately. */
- broadcast = is_multicast_ether_addr(dest);
-
- /* Look through all the published ethernet addresses to see if we
- * should send this packet. */
- for (i = 0; i < info->mapsize/sizeof(struct lguest_net); i++) {
- /* We don't send to ourselves (we actually can't SEND_DMA to
- * ourselves anyway), and don't send to unused slots.*/
- if (i == info->me || unused_peer(info->peer, i))
- continue;
-
- /* If it's broadcast we send it. If they want every packet we
- * send it. If the destination matches their address we send
- * it. Otherwise we go to the next peer. */
- if (!broadcast && !promisc(info, i) && !mac_eq(dest, info, i))
- continue;
-
- pr_debug("lguestnet %s: sending from %i to %i\n",
- dev->name, info->me, i);
- /* Our routine which actually does the transfer. */
- transfer_packet(dev, skb, i);
- }
-
- /* An xmit routine is expected to dispose of the packet, so we do. */
- dev_kfree_skb(skb);
-
- /* As per kernel convention, 0 means success. This is why I love
- * networking: even if we never sent to anyone, that's still
- * success! */
- return 0;
-}
-
-/*D:560
- * Packet receiving.
- *
- * First, here's a helper routine which fills one of our array of receive
- * buffers: */
-static int fill_slot(struct net_device *dev, unsigned int slot)
-{
- struct lguestnet_info *info = netdev_priv(dev);
-
- /* We can receive ETH_DATA_LEN (1500) byte packets, plus a standard
- * ethernet header of ETH_HLEN (14) bytes. */
- info->skb[slot] = netdev_alloc_skb(dev, ETH_HLEN + ETH_DATA_LEN);
- if (!info->skb[slot]) {
- printk("%s: could not fill slot %i\n", dev->name, slot);
- return -ENOMEM;
- }
-
- /* skb_to_dma() is a helper which sets up the "struct lguest_dma" to
- * point to the data in the skb: we also use it for sending out a
- * packet. */
- skb_to_dma(info->skb[slot], ETH_HLEN + ETH_DATA_LEN, &info->dma[slot]);
-
- /* This is a Write Memory Barrier: it ensures that the entry in the
- * receive buffer array is written *before* we set the "used_len" entry
- * to 0. If the Host were looking at the receive buffer array from a
- * different CPU, it could potentially see "used_len = 0" and not see
- * the updated receive buffer information. This would be a horribly
- * nasty bug, so make sure the compiler and CPU know this has to happen
- * first. */
- wmb();
- /* Writing 0 to "used_len" tells the Host it can use this receive
- * buffer now. */
- info->dma[slot].used_len = 0;
- return 0;
-}
-
-/* This is the actual receive routine. When we receive an interrupt from the
- * Host to tell us a packet has been delivered, we arrive here: */
-static irqreturn_t lguestnet_rcv(int irq, void *dev_id)
-{
- struct net_device *dev = dev_id;
- struct lguestnet_info *info = netdev_priv(dev);
- unsigned int i, done = 0;
-
- /* Look through our entire receive array for an entry which has data
- * in it. */
- for (i = 0; i < ARRAY_SIZE(info->dma); i++) {
- unsigned int length;
- struct sk_buff *skb;
-
- length = info->dma[i].used_len;
- if (length == 0)
- continue;
-
- /* We've found one! Remember the skb (we grabbed the length
- * above), and immediately refill the slot we've taken it
- * from. */
- done++;
- skb = info->skb[i];
- fill_slot(dev, i);
-
- /* This shouldn't happen: micropackets could be sent by a
- * badly-behaved Guest on the network, but the Host will never
- * stuff more data in the buffer than the buffer length. */
- if (length < ETH_HLEN || length > ETH_HLEN + ETH_DATA_LEN) {
- pr_debug(KERN_WARNING "%s: unbelievable skb len: %i\n",
- dev->name, length);
- dev_kfree_skb(skb);
- continue;
- }
-
- /* skb_put(), what a great function! I've ranted about this
- * function before (http://lkml.org/lkml/1999/9/26/24). You
- * call it after you've added data to the end of an skb (in
- * this case, it was the Host which wrote the data). */
- skb_put(skb, length);
-
- /* The ethernet header contains a protocol field: we use the
- * standard helper to extract it, and place the result in
- * skb->protocol. The helper also sets up skb->pkt_type and
- * eats up the ethernet header from the front of the packet. */
- skb->protocol = eth_type_trans(skb, dev);
-
- /* If this device doesn't need checksums for sending, we also
- * don't need to check the packets when they come in. */
- if (dev->features & NETIF_F_NO_CSUM)
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- /* As a last resort for debugging the driver or the lguest I/O
- * subsystem, you can uncomment the "#define DEBUG" at the top
- * of this file, which turns all the pr_debug() into printk()
- * and floods the logs. */
- pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
- ntohs(skb->protocol), skb->len, skb->pkt_type);
-
- /* Update the packet and byte counts (visible from ifconfig,
- * and good for debugging). */
- dev->stats.rx_bytes += skb->len;
- dev->stats.rx_packets++;
-
- /* Hand our fresh network packet into the stack's "network
- * interface receive" routine. That will free the packet
- * itself when it's finished. */
- netif_rx(skb);
- }
-
- /* If we found any packets, we assume the interrupt was for us. */
- return done ? IRQ_HANDLED : IRQ_NONE;
-}
-
-/*D:550 This is where we start: when the device is brought up by dhcpd or
- * ifconfig. At this point we advertise our MAC address to the rest of the
- * network, and register receive buffers ready for incoming packets. */
-static int lguestnet_open(struct net_device *dev)
-{
- int i;
- struct lguestnet_info *info = netdev_priv(dev);
-
- /* Copy our MAC address into the device page, so others on the network
- * can find us. */
- memcpy(info->peer[info->me].mac, dev->dev_addr, ETH_ALEN);
-
- /* We might already be in promisc mode (dev->flags & IFF_PROMISC). Our
- * set_multicast callback handles this already, so we call it now. */
- lguestnet_set_multicast(dev);
-
- /* Allocate packets and put them into our "struct lguest_dma" array.
- * If we fail to allocate all the packets we could still limp along,
- * but it's a sign of real stress so we should probably give up now. */
- for (i = 0; i < ARRAY_SIZE(info->dma); i++) {
- if (fill_slot(dev, i) != 0)
- goto cleanup;
- }
-
- /* Finally we tell the Host where our array of "struct lguest_dma"
- * receive buffers is, binding it to the key corresponding to the
- * device's physical memory plus our peerid. */
- if (lguest_bind_dma(peer_key(info,info->me), info->dma,
- NUM_SKBS, lgdev_irq(info->lgdev)) != 0)
- goto cleanup;
- return 0;
-
-cleanup:
- while (--i >= 0)
- dev_kfree_skb(info->skb[i]);
- return -ENOMEM;
-}
-/*:*/
-
-/* The close routine is called when the device is no longer in use: we clean up
- * elegantly. */
-static int lguestnet_close(struct net_device *dev)
-{
- unsigned int i;
- struct lguestnet_info *info = netdev_priv(dev);
-
- /* Clear all trace of our existence out of the device memory by setting
- * the slot which held our MAC address to 0 (unused). */
- memset(&info->peer[info->me], 0, sizeof(info->peer[info->me]));
-
- /* Unregister our array of receive buffers */
- lguest_unbind_dma(peer_key(info, info->me), info->dma);
- for (i = 0; i < ARRAY_SIZE(info->dma); i++)
- dev_kfree_skb(info->skb[i]);
- return 0;
-}
-
-/*D:510 The network device probe function is basically a standard ethernet
- * device setup. It reads the "struct lguest_device_desc" and sets the "struct
- * net_device". Oh, the line-by-line excitement! Let's skip over it. :*/
-static int lguestnet_probe(struct lguest_device *lgdev)
-{
- int err, irqf = IRQF_SHARED;
- struct net_device *dev;
- struct lguestnet_info *info;
- struct lguest_device_desc *desc = &lguest_devices[lgdev->index];
-
- pr_debug("lguest_net: probing for device %i\n", lgdev->index);
-
- dev = alloc_etherdev(sizeof(struct lguestnet_info));
- if (!dev)
- return -ENOMEM;
-
- /* Ethernet defaults with some changes */
- ether_setup(dev);
- dev->set_mac_address = NULL;
- random_ether_addr(dev->dev_addr);
-
- dev->open = lguestnet_open;
- dev->stop = lguestnet_close;
- dev->hard_start_xmit = lguestnet_start_xmit;
-
- /* We don't actually support multicast yet, but turning on/off
- * promisc also calls dev->set_multicast_list. */
- dev->set_multicast_list = lguestnet_set_multicast;
- SET_NETDEV_DEV(dev, &lgdev->dev);
-
- /* The network code complains if you have "scatter-gather" capability
- * if you don't also handle checksums (it seem that would be
- * "illogical"). So we use a lie of omission and don't tell it that we
- * can handle scattered packets unless we also don't want checksums,
- * even though to us they're completely independent. */
- if (desc->features & LGUEST_NET_F_NOCSUM)
- dev->features = NETIF_F_SG|NETIF_F_NO_CSUM;
-
- info = netdev_priv(dev);
- info->mapsize = PAGE_SIZE * desc->num_pages;
- info->peer_phys = ((unsigned long)desc->pfn << PAGE_SHIFT);
- info->lgdev = lgdev;
- info->peer = lguest_map(info->peer_phys, desc->num_pages);
- if (!info->peer) {
- err = -ENOMEM;
- goto free;
- }
-
- /* This stores our peerid (upper bits reserved for future). */
- info->me = (desc->features & (info->mapsize-1));
-
- err = register_netdev(dev);
- if (err) {
- pr_debug("lguestnet: registering device failed\n");
- goto unmap;
- }
-
- if (lguest_devices[lgdev->index].features & LGUEST_DEVICE_F_RANDOMNESS)
- irqf |= IRQF_SAMPLE_RANDOM;
- if (request_irq(lgdev_irq(lgdev), lguestnet_rcv, irqf, "lguestnet",
- dev) != 0) {
- pr_debug("lguestnet: cannot get irq %i\n", lgdev_irq(lgdev));
- goto unregister;
- }
-
- pr_debug("lguestnet: registered device %s\n", dev->name);
- /* Finally, we put the "struct net_device" in the generic "struct
- * lguest_device"s private pointer. Again, it's not necessary, but
- * makes sure the cool kernel kids don't tease us. */
- lgdev->private = dev;
- return 0;
-
-unregister:
- unregister_netdev(dev);
-unmap:
- lguest_unmap(info->peer);
-free:
- free_netdev(dev);
- return err;
-}
-
-static struct lguest_driver lguestnet_drv = {
- .name = "lguestnet",
- .owner = THIS_MODULE,
- .device_type = LGUEST_DEVICE_T_NET,
- .probe = lguestnet_probe,
-};
-
-static __init int lguestnet_init(void)
-{
- return register_lguest_driver(&lguestnet_drv);
-}
-module_init(lguestnet_init);
-
-MODULE_DESCRIPTION("Lguest network driver");
-MODULE_LICENSE("GPL");
-
-/*D:580
- * This is the last of the Drivers, and with this we have covered the many and
- * wonderous and fine (and boring) details of the Guest.
- *
- * "make Launcher" beckons, where we answer questions like "Where do Guests
- * come from?", and "What do you do when someone asks for optimization?"
- */
+++ /dev/null
-#ifndef _ASM_LGUEST_DEVICE_H
-#define _ASM_LGUEST_DEVICE_H
-/* Everything you need to know about lguest devices. */
-#include <linux/device.h>
-#include <linux/lguest.h>
-#include <linux/lguest_launcher.h>
-
-struct lguest_device {
- /* Unique busid, and index into lguest_page->devices[] */
- unsigned int index;
-
- struct device dev;
-
- /* Driver can hang data off here. */
- void *private;
-};
-
-/*D:380 Since interrupt numbers are arbitrary, we use a convention: each device
- * can use the interrupt number corresponding to its index. The +1 is because
- * interrupt 0 is not usable (it's actually the timer interrupt). */
-static inline int lgdev_irq(const struct lguest_device *dev)
-{
- return dev->index + 1;
-}
-/*:*/
-
-/* dma args must not be vmalloced! */
-void lguest_send_dma(unsigned long key, struct lguest_dma *dma);
-int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
- unsigned int num, u8 irq);
-void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas);
-
-/* Map the virtual device space */
-void *lguest_map(unsigned long phys_addr, unsigned long pages);
-void lguest_unmap(void *);
-
-struct lguest_driver {
- const char *name;
- struct module *owner;
- u16 device_type;
- int (*probe)(struct lguest_device *dev);
- void (*remove)(struct lguest_device *dev);
-
- struct device_driver drv;
-};
-
-extern int register_lguest_driver(struct lguest_driver *drv);
-extern void unregister_lguest_driver(struct lguest_driver *drv);
-
-extern struct lguest_device_desc *lguest_devices; /* Just past max_pfn */
-#endif /* _ASM_LGUEST_DEVICE_H */
};
/*:*/
-/*D:460 This is the layout of a block device memory page. The Launcher sets up
- * the num_sectors initially to tell the Guest the size of the disk. The Guest
- * puts the type, sector and length of the request in the first three fields,
- * then DMAs to the Host. The Host processes the request, sets up the result,
- * then DMAs back to the Guest. */
-struct lguest_block_page
-{
- /* 0 is a read, 1 is a write. */
- int type;
- __u32 sector; /* Offset in device = sector * 512. */
- __u32 bytes; /* Length expected to be read/written in bytes */
- /* 0 = pending, 1 = done, 2 = done, error */
- int result;
- __u32 num_sectors; /* Disk length = num_sectors * 512 */
-};
-
-/*D:520 The network device is basically a memory page where all the Guests on
- * the network publish their MAC (ethernet) addresses: it's an array of "struct
- * lguest_net": */
-struct lguest_net
-{
- /* Simply the mac address (with multicast bit meaning promisc). */
- unsigned char mac[6];
-};
-/*:*/
-
/* Where the Host expects the Guest to SEND_DMA console output to. */
#define LGUEST_CONSOLE_DMA_KEY 0
projects / linux-2.6 / commitdiff