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Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

Browse Source 
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  lguest: don't force VIRTIO_F_NOTIFY_ON_EMPTY
  lguest: cleanup for map_switcher()
  lguest: use PGDIR_SHIFT for PAE code to allow different PAGE_OFFSET
  lguest: use set_pte/set_pmd uniformly for real page table entries
  lguest: move panic notifier registration to its expected place.
  virtio_blk: add support for cache flush
  virtio: add virtio IDs file
  virtio: get rid of redundant VIRTIO_ID_9P definition
  virtio: make add_buf return capacity remaining
  virtio_pci: minor MSI-X cleanups
This commit is contained in:
Linus Torvalds 2009-09-23 09:23:45 -07:00
commit 1f0918d03f
20 changed files with 199 additions and 133 deletions
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26
Documentation/lguest/lguest.c
View File

@ -42,6 +42,7 @@
#include <signal.h> #include <signal.h>
#include "linux/lguest_launcher.h" #include "linux/lguest_launcher.h"
#include "linux/virtio_config.h" #include "linux/virtio_config.h"
#include <linux/virtio_ids.h>
#include "linux/virtio_net.h" #include "linux/virtio_net.h"
#include "linux/virtio_blk.h" #include "linux/virtio_blk.h"
#include "linux/virtio_console.h" #include "linux/virtio_console.h"
@ -133,6 +134,9 @@ struct device {
/* Is it operational */ /* Is it operational */
bool running; bool running;
/* Does Guest want an intrrupt on empty? */
bool irq_on_empty;
/* Device-specific data. */ /* Device-specific data. */
void *priv; void *priv;
}; };
@ -623,10 +627,13 @@ static void trigger_irq(struct virtqueue *vq)
return; return;
vq->pending_used = 0; vq->pending_used = 0;
/* If they don't want an interrupt, don't send one, unless empty. */ /* If they don't want an interrupt, don't send one... */
if ((vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT) if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT) {
&& lg_last_avail(vq) != vq->vring.avail->idx) /* ... unless they've asked us to force one on empty. */
return; if (!vq->dev->irq_on_empty
|| lg_last_avail(vq) != vq->vring.avail->idx)
return;
}
/* Send the Guest an interrupt tell them we used something up. */ /* Send the Guest an interrupt tell them we used something up. */
if (write(lguest_fd, buf, sizeof(buf)) != 0) if (write(lguest_fd, buf, sizeof(buf)) != 0)
@ -1042,6 +1049,15 @@ static void create_thread(struct virtqueue *vq)
close(vq->eventfd); close(vq->eventfd);
} }
static bool accepted_feature(struct device *dev, unsigned int bit)
{
const u8 *features = get_feature_bits(dev) + dev->feature_len;
if (dev->feature_len < bit / CHAR_BIT)
return false;
return features[bit / CHAR_BIT] & (1 << (bit % CHAR_BIT));
}
static void start_device(struct device *dev) static void start_device(struct device *dev)
{ {
unsigned int i; unsigned int i;
@ -1055,6 +1071,8 @@ static void start_device(struct device *dev)
verbose(" %02x", get_feature_bits(dev) verbose(" %02x", get_feature_bits(dev)
[dev->feature_len+i]); [dev->feature_len+i]);
dev->irq_on_empty = accepted_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY);
for (vq = dev->vq; vq; vq = vq->next) { for (vq = dev->vq; vq; vq = vq->next) {
if (vq->service) if (vq->service)
create_thread(vq); create_thread(vq);

10
arch/x86/lguest/boot.c
View File

@ -1135,11 +1135,6 @@ static struct notifier_block paniced = {
/* Setting up memory is fairly easy. */ /* Setting up memory is fairly easy. */
static __init char *lguest_memory_setup(void) static __init char *lguest_memory_setup(void)
{ {
/* We do this here and not earlier because lockcheck used to barf if we
* did it before start_kernel(). I think we fixed that, so it'd be
* nice to move it back to lguest_init. Patch welcome... */
atomic_notifier_chain_register(&panic_notifier_list, &paniced);
/* /*
*The Linux bootloader header contains an "e820" memory map: the *The Linux bootloader header contains an "e820" memory map: the
* Launcher populated the first entry with our memory limit. * Launcher populated the first entry with our memory limit.
@ -1364,10 +1359,13 @@ __init void lguest_init(void)
/* /*
* If we don't initialize the lock dependency checker now, it crashes * If we don't initialize the lock dependency checker now, it crashes
* paravirt_disable_iospace. * atomic_notifier_chain_register, then paravirt_disable_iospace.
*/ */
lockdep_init(); lockdep_init();
/* Hook in our special panic hypercall code. */
atomic_notifier_chain_register(&panic_notifier_list, &paniced);
/* /*
* The IDE code spends about 3 seconds probing for disks: if we reserve * The IDE code spends about 3 seconds probing for disks: if we reserve
* all the I/O ports up front it can't get them and so doesn't probe. * all the I/O ports up front it can't get them and so doesn't probe.

33
drivers/block/virtio_blk.c
View File

@ -3,6 +3,7 @@
#include <linux/blkdev.h> #include <linux/blkdev.h>
#include <linux/hdreg.h> #include <linux/hdreg.h>
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_blk.h> #include <linux/virtio_blk.h>
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
@ -91,15 +92,26 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
return false; return false;
vbr->req = req; vbr->req = req;
if (blk_fs_request(vbr->req)) { switch (req->cmd_type) {
case REQ_TYPE_FS:
vbr->out_hdr.type = 0; vbr->out_hdr.type = 0;
vbr->out_hdr.sector = blk_rq_pos(vbr->req); vbr->out_hdr.sector = blk_rq_pos(vbr->req);
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
} else if (blk_pc_request(vbr->req)) { break;
case REQ_TYPE_BLOCK_PC:
vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD; vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
vbr->out_hdr.sector = 0; vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
} else { break;
case REQ_TYPE_LINUX_BLOCK:
if (req->cmd[0] == REQ_LB_OP_FLUSH) {
vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
vbr->out_hdr.sector = 0;
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
break;
}
/*FALLTHRU*/
default:
/* We don't put anything else in the queue. */ /* We don't put anything else in the queue. */
BUG(); BUG();
} }
@ -139,7 +151,7 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
} }
} }
if (vblk->vq->vq_ops->add_buf(vblk->vq, vblk->sg, out, in, vbr)) { if (vblk->vq->vq_ops->add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) {
mempool_free(vbr, vblk->pool); mempool_free(vbr, vblk->pool);
return false; return false;
} }
@ -199,6 +211,12 @@ static int virtblk_identify(struct gendisk *disk, void *argp)
return err; return err;
} }
static void virtblk_prepare_flush(struct request_queue *q, struct request *req)
{
req->cmd_type = REQ_TYPE_LINUX_BLOCK;
req->cmd[0] = REQ_LB_OP_FLUSH;
}
static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long data) unsigned cmd, unsigned long data)
{ {
@ -337,7 +355,10 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
index++; index++;
/* If barriers are supported, tell block layer that queue is ordered */ /* If barriers are supported, tell block layer that queue is ordered */
if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH))
blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_DRAIN_FLUSH,
virtblk_prepare_flush);
else if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER))
blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL);
/* If disk is read-only in the host, the guest should obey */ /* If disk is read-only in the host, the guest should obey */
@ -424,7 +445,7 @@ static struct virtio_device_id id_table[] = {
static unsigned int features[] = { static unsigned int features[] = {
VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX,
VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_IDENTIFY VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_IDENTIFY, VIRTIO_BLK_F_FLUSH
}; };
/* /*

3
drivers/char/hw_random/virtio-rng.c
View File

@ -21,6 +21,7 @@
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_rng.h> #include <linux/virtio_rng.h>
/* The host will fill any buffer we give it with sweet, sweet randomness. We /* The host will fill any buffer we give it with sweet, sweet randomness. We
@ -51,7 +52,7 @@ static void register_buffer(void)
sg_init_one(&sg, random_data+data_left, RANDOM_DATA_SIZE-data_left); sg_init_one(&sg, random_data+data_left, RANDOM_DATA_SIZE-data_left);
/* There should always be room for one buffer. */ /* There should always be room for one buffer. */
if (vq->vq_ops->add_buf(vq, &sg, 0, 1, random_data) != 0) if (vq->vq_ops->add_buf(vq, &sg, 0, 1, random_data) < 0)
BUG(); BUG();
vq->vq_ops->kick(vq); vq->vq_ops->kick(vq);
} }

5
drivers/char/virtio_console.c
View File

@ -31,6 +31,7 @@
#include <linux/err.h> #include <linux/err.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_console.h> #include <linux/virtio_console.h>
#include "hvc_console.h" #include "hvc_console.h"
@ -65,7 +66,7 @@ static int put_chars(u32 vtermno, const char *buf, int count)
/* add_buf wants a token to identify this buffer: we hand it any /* add_buf wants a token to identify this buffer: we hand it any
* non-NULL pointer, since there's only ever one buffer. */ * non-NULL pointer, since there's only ever one buffer. */
if (out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, (void *)1) == 0) { if (out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, (void *)1) >= 0) {
/* Tell Host to go! */ /* Tell Host to go! */
out_vq->vq_ops->kick(out_vq); out_vq->vq_ops->kick(out_vq);
/* Chill out until it's done with the buffer. */ /* Chill out until it's done with the buffer. */
@ -85,7 +86,7 @@ static void add_inbuf(void)
sg_init_one(sg, inbuf, PAGE_SIZE); sg_init_one(sg, inbuf, PAGE_SIZE);
/* We should always be able to add one buffer to an empty queue. */ /* We should always be able to add one buffer to an empty queue. */
if (in_vq->vq_ops->add_buf(in_vq, sg, 0, 1, inbuf) != 0) if (in_vq->vq_ops->add_buf(in_vq, sg, 0, 1, inbuf) < 0)
BUG(); BUG();
in_vq->vq_ops->kick(in_vq); in_vq->vq_ops->kick(in_vq);
} }

5
drivers/lguest/core.c
View File

@ -67,12 +67,11 @@ static __init int map_switcher(void)
* so we make sure they're zeroed. * so we make sure they're zeroed.
*/ */
for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) { for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) {
unsigned long addr = get_zeroed_page(GFP_KERNEL); switcher_page[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
if (!addr) { if (!switcher_page[i]) {
err = -ENOMEM; err = -ENOMEM;
goto free_some_pages; goto free_some_pages;
} }
switcher_page[i] = virt_to_page(addr);
} }
/* /*

45
drivers/lguest/page_tables.c
View File

@ -380,7 +380,7 @@ bool demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode)
* And we copy the flags to the shadow PMD entry. The page * And we copy the flags to the shadow PMD entry. The page
* number in the shadow PMD is the page we just allocated. * number in the shadow PMD is the page we just allocated.
*/ */
native_set_pmd(spmd, __pmd(__pa(ptepage) | pmd_flags(gpmd))); set_pmd(spmd, __pmd(__pa(ptepage) | pmd_flags(gpmd)));
} }
/* /*
@ -447,7 +447,7 @@ bool demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode)
* we will come back here when a write does actually occur, so * we will come back here when a write does actually occur, so
* we can update the Guest's _PAGE_DIRTY flag. * we can update the Guest's _PAGE_DIRTY flag.
*/ */
native_set_pte(spte, gpte_to_spte(cpu, pte_wrprotect(gpte), 0)); set_pte(spte, gpte_to_spte(cpu, pte_wrprotect(gpte), 0));
/* /*
* Finally, we write the Guest PTE entry back: we've set the * Finally, we write the Guest PTE entry back: we've set the
@ -528,7 +528,7 @@ static void release_pmd(pmd_t *spmd)
/* Now we can free the page of PTEs */ /* Now we can free the page of PTEs */
free_page((long)ptepage); free_page((long)ptepage);
/* And zero out the PMD entry so we never release it twice. */ /* And zero out the PMD entry so we never release it twice. */
native_set_pmd(spmd, __pmd(0)); set_pmd(spmd, __pmd(0));
} }
} }
@ -833,15 +833,15 @@ static void do_set_pte(struct lg_cpu *cpu, int idx,
*/ */
if (pte_flags(gpte) & (_PAGE_DIRTY | _PAGE_ACCESSED)) { if (pte_flags(gpte) & (_PAGE_DIRTY | _PAGE_ACCESSED)) {
check_gpte(cpu, gpte); check_gpte(cpu, gpte);
native_set_pte(spte, set_pte(spte,
gpte_to_spte(cpu, gpte, gpte_to_spte(cpu, gpte,
pte_flags(gpte) & _PAGE_DIRTY)); pte_flags(gpte) & _PAGE_DIRTY));
} else { } else {
/* /*
* Otherwise kill it and we can demand_page() * Otherwise kill it and we can demand_page()
* it in later. * it in later.
*/ */
native_set_pte(spte, __pte(0)); set_pte(spte, __pte(0));
} }
#ifdef CONFIG_X86_PAE #ifdef CONFIG_X86_PAE
} }
@ -983,25 +983,22 @@ static unsigned long setup_pagetables(struct lguest *lg,
*/ */
for (i = j = 0; i < mapped_pages && j < PTRS_PER_PMD; for (i = j = 0; i < mapped_pages && j < PTRS_PER_PMD;
i += PTRS_PER_PTE, j++) { i += PTRS_PER_PTE, j++) {
/* FIXME: native_set_pmd is overkill here. */ pmd = pfn_pmd(((unsigned long)&linear[i] - mem_base)/PAGE_SIZE,
native_set_pmd(&pmd, __pmd(((unsigned long)(linear + i) __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER));
- mem_base) | _PAGE_PRESENT | _PAGE_RW | _PAGE_USER));
if (copy_to_user(&pmds[j], &pmd, sizeof(pmd)) != 0) if (copy_to_user(&pmds[j], &pmd, sizeof(pmd)) != 0)
return -EFAULT; return -EFAULT;
} }
/* One PGD entry, pointing to that PMD page. */ /* One PGD entry, pointing to that PMD page. */
set_pgd(&pgd, __pgd(((u32)pmds - mem_base) | _PAGE_PRESENT)); pgd = __pgd(((unsigned long)pmds - mem_base) | _PAGE_PRESENT);
/* Copy it in as the first PGD entry (ie. addresses 0-1G). */ /* Copy it in as the first PGD entry (ie. addresses 0-1G). */
if (copy_to_user(&pgdir[0], &pgd, sizeof(pgd)) != 0) if (copy_to_user(&pgdir[0], &pgd, sizeof(pgd)) != 0)
return -EFAULT; return -EFAULT;
/* /*
* And the third PGD entry (ie. addresses 3G-4G). * And the other PGD entry to make the linear mapping at PAGE_OFFSET
*
* FIXME: This assumes that PAGE_OFFSET for the Guest is 0xC0000000.
*/ */
if (copy_to_user(&pgdir[3], &pgd, sizeof(pgd)) != 0) if (copy_to_user(&pgdir[KERNEL_PGD_BOUNDARY], &pgd, sizeof(pgd)))
return -EFAULT; return -EFAULT;
#else #else
/* /*
@ -1141,15 +1138,13 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages)
{ {
pte_t *switcher_pte_page = __get_cpu_var(switcher_pte_pages); pte_t *switcher_pte_page = __get_cpu_var(switcher_pte_pages);
pte_t regs_pte; pte_t regs_pte;
unsigned long pfn;
#ifdef CONFIG_X86_PAE #ifdef CONFIG_X86_PAE
pmd_t switcher_pmd; pmd_t switcher_pmd;
pmd_t *pmd_table; pmd_t *pmd_table;
/* FIXME: native_set_pmd is overkill here. */ switcher_pmd = pfn_pmd(__pa(switcher_pte_page) >> PAGE_SHIFT,
native_set_pmd(&switcher_pmd, pfn_pmd(__pa(switcher_pte_page) >> PAGE_KERNEL_EXEC);
PAGE_SHIFT, PAGE_KERNEL_EXEC));
/* Figure out where the pmd page is, by reading the PGD, and converting /* Figure out where the pmd page is, by reading the PGD, and converting
* it to a virtual address. */ * it to a virtual address. */
@ -1157,7 +1152,7 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages)
pgdirs[cpu->cpu_pgd].pgdir[SWITCHER_PGD_INDEX]) pgdirs[cpu->cpu_pgd].pgdir[SWITCHER_PGD_INDEX])
<< PAGE_SHIFT); << PAGE_SHIFT);
/* Now write it into the shadow page table. */ /* Now write it into the shadow page table. */
native_set_pmd(&pmd_table[SWITCHER_PMD_INDEX], switcher_pmd); set_pmd(&pmd_table[SWITCHER_PMD_INDEX], switcher_pmd);
#else #else
pgd_t switcher_pgd; pgd_t switcher_pgd;
@ -1179,10 +1174,8 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages)
* page is already mapped there, we don't have to copy them out * page is already mapped there, we don't have to copy them out
* again. * again.
*/ */
pfn = __pa(cpu->regs_page) >> PAGE_SHIFT; regs_pte = pfn_pte(__pa(cpu->regs_page) >> PAGE_SHIFT, PAGE_KERNEL);
native_set_pte(&regs_pte, pfn_pte(pfn, PAGE_KERNEL)); set_pte(&switcher_pte_page[pte_index((unsigned long)pages)], regs_pte);
native_set_pte(&switcher_pte_page[pte_index((unsigned long)pages)],
regs_pte);
} }
/*:*/ /*:*/
@ -1209,7 +1202,7 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
/* The first entries are easy: they map the Switcher code. */ /* The first entries are easy: they map the Switcher code. */
for (i = 0; i < pages; i++) { for (i = 0; i < pages; i++) {
native_set_pte(&pte[i], mk_pte(switcher_page[i], set_pte(&pte[i], mk_pte(switcher_page[i],
__pgprot(_PAGE_PRESENT|_PAGE_ACCESSED))); __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED)));
} }
@ -1217,14 +1210,14 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
i = pages + cpu*2; i = pages + cpu*2;
/* First page (Guest registers) is writable from the Guest */ /* First page (Guest registers) is writable from the Guest */
native_set_pte(&pte[i], pfn_pte(page_to_pfn(switcher_page[i]), set_pte(&pte[i], pfn_pte(page_to_pfn(switcher_page[i]),
__pgprot(_PAGE_PRESENT|_PAGE_ACCESSED|_PAGE_RW))); __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED|_PAGE_RW)));
/* /*
* The second page contains the "struct lguest_ro_state", and is * The second page contains the "struct lguest_ro_state", and is
* read-only. * read-only.
*/ */
native_set_pte(&pte[i+1], pfn_pte(page_to_pfn(switcher_page[i+1]), set_pte(&pte[i+1], pfn_pte(page_to_pfn(switcher_page[i+1]),
__pgprot(_PAGE_PRESENT|_PAGE_ACCESSED))); __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED)));
} }

15
drivers/net/virtio_net.c
View File

@ -22,6 +22,7 @@
#include <linux/ethtool.h> #include <linux/ethtool.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_net.h> #include <linux/virtio_net.h>
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
#include <linux/if_vlan.h> #include <linux/if_vlan.h>
@ -320,7 +321,7 @@ static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
skb_queue_head(&vi->recv, skb); skb_queue_head(&vi->recv, skb);
err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
if (err) { if (err < 0) {
skb_unlink(skb, &vi->recv); skb_unlink(skb, &vi->recv);
trim_pages(vi, skb); trim_pages(vi, skb);
kfree_skb(skb); kfree_skb(skb);
@ -373,7 +374,7 @@ static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
skb_queue_head(&vi->recv, skb); skb_queue_head(&vi->recv, skb);
err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb); err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb);
if (err) { if (err < 0) {
skb_unlink(skb, &vi->recv); skb_unlink(skb, &vi->recv);
kfree_skb(skb); kfree_skb(skb);
break; break;
@ -527,7 +528,7 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
if (!err && !vi->free_in_tasklet) if (err >= 0 && !vi->free_in_tasklet)
mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
return err; return err;
@ -538,7 +539,7 @@ static void xmit_tasklet(unsigned long data)
struct virtnet_info *vi = (void *)data; struct virtnet_info *vi = (void *)data;
netif_tx_lock_bh(vi->dev); netif_tx_lock_bh(vi->dev);
if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) >= 0) {
vi->svq->vq_ops->kick(vi->svq); vi->svq->vq_ops->kick(vi->svq);
vi->last_xmit_skb = NULL; vi->last_xmit_skb = NULL;
} }
@ -557,7 +558,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
/* If we has a buffer left over from last time, send it now. */ /* If we has a buffer left over from last time, send it now. */
if (unlikely(vi->last_xmit_skb) && if (unlikely(vi->last_xmit_skb) &&
xmit_skb(vi, vi->last_xmit_skb) != 0) xmit_skb(vi, vi->last_xmit_skb) < 0)
goto stop_queue; goto stop_queue;
vi->last_xmit_skb = NULL; vi->last_xmit_skb = NULL;
@ -565,7 +566,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Put new one in send queue and do transmit */ /* Put new one in send queue and do transmit */
if (likely(skb)) { if (likely(skb)) {
__skb_queue_head(&vi->send, skb); __skb_queue_head(&vi->send, skb);
if (xmit_skb(vi, skb) != 0) { if (xmit_skb(vi, skb) < 0) {
vi->last_xmit_skb = skb; vi->last_xmit_skb = skb;
skb = NULL; skb = NULL;
goto stop_queue; goto stop_queue;
@ -668,7 +669,7 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
sg_set_buf(&sg[i + 1], sg_virt(s), s->length); sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi)); BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0);
vi->cvq->vq_ops->kick(vi->cvq); vi->cvq->vq_ops->kick(vi->cvq);

3
drivers/virtio/virtio_balloon.c
View File

@ -19,6 +19,7 @@
*/ */
//#define DEBUG //#define DEBUG
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_balloon.h> #include <linux/virtio_balloon.h>
#include <linux/swap.h> #include <linux/swap.h>
#include <linux/kthread.h> #include <linux/kthread.h>
@ -84,7 +85,7 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
init_completion(&vb->acked); init_completion(&vb->acked);
/* We should always be able to add one buffer to an empty queue. */ /* We should always be able to add one buffer to an empty queue. */
if (vq->vq_ops->add_buf(vq, &sg, 1, 0, vb) != 0) if (vq->vq_ops->add_buf(vq, &sg, 1, 0, vb) < 0)
BUG(); BUG();
vq->vq_ops->kick(vq); vq->vq_ops->kick(vq);

125
drivers/virtio/virtio_pci.c
View File

@ -84,7 +84,7 @@ struct virtio_pci_vq_info
struct list_head node; struct list_head node;
/* MSI-X vector (or none) */ /* MSI-X vector (or none) */
unsigned vector; unsigned msix_vector;
}; };
/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
@ -280,25 +280,14 @@ static void vp_free_vectors(struct virtio_device *vdev)
vp_dev->msix_entries = NULL; vp_dev->msix_entries = NULL;
} }
static int vp_request_vectors(struct virtio_device *vdev, int nvectors, static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
bool per_vq_vectors) bool per_vq_vectors)
{ {
struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev); const char *name = dev_name(&vp_dev->vdev.dev);
unsigned i, v; unsigned i, v;
int err = -ENOMEM; int err = -ENOMEM;
if (!nvectors) {
/* Can't allocate MSI-X vectors, use regular interrupt */
vp_dev->msix_vectors = 0;
err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
IRQF_SHARED, name, vp_dev);
if (err)
return err;
vp_dev->intx_enabled = 1;
return 0;
}
vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries, vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
GFP_KERNEL); GFP_KERNEL);
if (!vp_dev->msix_entries) if (!vp_dev->msix_entries)
@ -311,6 +300,7 @@ static int vp_request_vectors(struct virtio_device *vdev, int nvectors,
for (i = 0; i < nvectors; ++i) for (i = 0; i < nvectors; ++i)
vp_dev->msix_entries[i].entry = i; vp_dev->msix_entries[i].entry = i;
/* pci_enable_msix returns positive if we can't get this many. */
err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors); err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors);
if (err > 0) if (err > 0)
err = -ENOSPC; err = -ENOSPC;
@ -356,10 +346,22 @@ static int vp_request_vectors(struct virtio_device *vdev, int nvectors,
return err; return err;
} }
static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index, static int vp_request_intx(struct virtio_device *vdev)
void (*callback)(struct virtqueue *vq), {
const char *name, int err;
u16 vector) struct virtio_pci_device *vp_dev = to_vp_device(vdev);
err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
if (!err)
vp_dev->intx_enabled = 1;
return err;
}
static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec)
{ {
struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info; struct virtio_pci_vq_info *info;
@ -384,7 +386,7 @@ static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index,
info->queue_index = index; info->queue_index = index;
info->num = num; info->num = num;
info->vector = vector; info->msix_vector = msix_vec;
size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN)); size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO); info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
@ -408,10 +410,10 @@ static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index,
vq->priv = info; vq->priv = info;
info->vq = vq; info->vq = vq;
if (vector != VIRTIO_MSI_NO_VECTOR) { if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
vector = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
if (vector == VIRTIO_MSI_NO_VECTOR) { if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY; err = -EBUSY;
goto out_assign; goto out_assign;
} }
@ -472,7 +474,8 @@ static void vp_del_vqs(struct virtio_device *vdev)
list_for_each_entry_safe(vq, n, &vdev->vqs, list) { list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
info = vq->priv; info = vq->priv;
if (vp_dev->per_vq_vectors) if (vp_dev->per_vq_vectors)
free_irq(vp_dev->msix_entries[info->vector].vector, vq); free_irq(vp_dev->msix_entries[info->msix_vector].vector,
vq);
vp_del_vq(vq); vp_del_vq(vq);
} }
vp_dev->per_vq_vectors = false; vp_dev->per_vq_vectors = false;
@ -484,38 +487,58 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], struct virtqueue *vqs[],
vq_callback_t *callbacks[], vq_callback_t *callbacks[],
const char *names[], const char *names[],
int nvectors, bool use_msix,
bool per_vq_vectors) bool per_vq_vectors)
{ {
struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_device *vp_dev = to_vp_device(vdev);
u16 vector; u16 msix_vec;
int i, err, allocated_vectors; int i, err, nvectors, allocated_vectors;
err = vp_request_vectors(vdev, nvectors, per_vq_vectors); if (!use_msix) {
if (err) /* Old style: one normal interrupt for change and all vqs. */
goto error_request; err = vp_request_intx(vdev);
if (err)
goto error_request;
} else {
if (per_vq_vectors) {
/* Best option: one for change interrupt, one per vq. */
nvectors = 1;
for (i = 0; i < nvqs; ++i)
if (callbacks[i])
++nvectors;
} else {
/* Second best: one for change, shared for all vqs. */
nvectors = 2;
}
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
if (err)
goto error_request;
}
vp_dev->per_vq_vectors = per_vq_vectors; vp_dev->per_vq_vectors = per_vq_vectors;
allocated_vectors = vp_dev->msix_used_vectors; allocated_vectors = vp_dev->msix_used_vectors;
for (i = 0; i < nvqs; ++i) { for (i = 0; i < nvqs; ++i) {
if (!callbacks[i] || !vp_dev->msix_enabled) if (!callbacks[i] || !vp_dev->msix_enabled)
vector = VIRTIO_MSI_NO_VECTOR; msix_vec = VIRTIO_MSI_NO_VECTOR;
else if (vp_dev->per_vq_vectors) else if (vp_dev->per_vq_vectors)
vector = allocated_vectors++; msix_vec = allocated_vectors++;
else else
vector = VP_MSIX_VQ_VECTOR; msix_vec = VP_MSIX_VQ_VECTOR;
vqs[i] = vp_find_vq(vdev, i, callbacks[i], names[i], vector); vqs[i] = setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
if (IS_ERR(vqs[i])) { if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]); err = PTR_ERR(vqs[i]);
goto error_find; goto error_find;
} }
/* allocate per-vq irq if available and necessary */ /* allocate per-vq irq if available and necessary */
if (vp_dev->per_vq_vectors && vector != VIRTIO_MSI_NO_VECTOR) { if (vp_dev->per_vq_vectors) {
snprintf(vp_dev->msix_names[vector], sizeof *vp_dev->msix_names, snprintf(vp_dev->msix_names[msix_vec],
"%s-%s", dev_name(&vp_dev->vdev.dev), names[i]); sizeof *vp_dev->msix_names,
err = request_irq(vp_dev->msix_entries[vector].vector, "%s-%s",
vring_interrupt, 0, dev_name(&vp_dev->vdev.dev), names[i]);
vp_dev->msix_names[vector], vqs[i]); err = request_irq(msix_vec, vring_interrupt, 0,
vp_dev->msix_names[msix_vec],
vqs[i]);
if (err) { if (err) {
vp_del_vq(vqs[i]); vp_del_vq(vqs[i]);
goto error_find; goto error_find;
@ -537,28 +560,20 @@ static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
vq_callback_t *callbacks[], vq_callback_t *callbacks[],
const char *names[]) const char *names[])
{ {
int vectors = 0; int err;
int i, uninitialized_var(err);
/* How many vectors would we like? */ /* Try MSI-X with one vector per queue. */
for (i = 0; i < nvqs; ++i) err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
if (callbacks[i])
++vectors;
/* We want at most one vector per queue and one for config changes. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
vectors + 1, true);
if (!err) if (!err)
return 0; return 0;
/* Fallback to separate vectors for config and a shared for queues. */ /* Fallback: MSI-X with one vector for config, one shared for queues. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
2, false); true, false);
if (!err) if (!err)
return 0; return 0;
/* Finally fall back to regular interrupts. */ /* Finally fall back to regular interrupts. */
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
0, false); false, false);
return err;
} }
static struct virtio_config_ops virtio_pci_config_ops = { static struct virtio_config_ops virtio_pci_config_ops = {

6
drivers/virtio/virtio_ring.c
View File

@ -208,7 +208,11 @@ static int vring_add_buf(struct virtqueue *_vq,
pr_debug("Added buffer head %i to %p\n", head, vq); pr_debug("Added buffer head %i to %p\n", head, vq);
END_USE(vq); END_USE(vq);
return 0;
/* If we're indirect, we can fit many (assuming not OOM). */
if (vq->indirect)
return vq->num_free ? vq->vring.num : 0;
return vq->num_free;
} }
static void vring_kick(struct virtqueue *_vq) static void vring_kick(struct virtqueue *_vq)

2
include/linux/virtio.h
View File

@ -34,7 +34,7 @@ struct virtqueue {
* out_num: the number of sg readable by other side * out_num: the number of sg readable by other side
* in_num: the number of sg which are writable (after readable ones) * in_num: the number of sg which are writable (after readable ones)
* data: the token identifying the buffer. * data: the token identifying the buffer.
* Returns 0 or an error. * Returns remaining capacity of queue (sg segments) or a negative error.
* @kick: update after add_buf * @kick: update after add_buf
* vq: the struct virtqueue * vq: the struct virtqueue
* After one or more add_buf calls, invoke this to kick the other side. * After one or more add_buf calls, invoke this to kick the other side.

2
include/linux/virtio_9p.h
View File

@ -4,8 +4,6 @@
* compatible drivers/servers. */ * compatible drivers/servers. */
#include <linux/virtio_config.h> #include <linux/virtio_config.h>
/* The ID for virtio console */
#define VIRTIO_ID_9P 9
/* Maximum number of virtio channels per partition (1 for now) */ /* Maximum number of virtio channels per partition (1 for now) */
#define MAX_9P_CHAN 1 #define MAX_9P_CHAN 1

3
include/linux/virtio_balloon.h
View File

@ -4,9 +4,6 @@
* compatible drivers/servers. */ * compatible drivers/servers. */
#include <linux/virtio_config.h> #include <linux/virtio_config.h>
/* The ID for virtio_balloon */
#define VIRTIO_ID_BALLOON 5
/* The feature bitmap for virtio balloon */ /* The feature bitmap for virtio balloon */
#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */

18
include/linux/virtio_blk.h
View File

@ -5,9 +5,6 @@
#include <linux/types.h> #include <linux/types.h>
#include <linux/virtio_config.h> #include <linux/virtio_config.h>
/* The ID for virtio_block */
#define VIRTIO_ID_BLOCK 2
/* Feature bits */ /* Feature bits */
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
@ -17,6 +14,7 @@
#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
#define VIRTIO_BLK_F_IDENTIFY 8 /* ATA IDENTIFY supported */ #define VIRTIO_BLK_F_IDENTIFY 8 /* ATA IDENTIFY supported */
#define VIRTIO_BLK_F_FLUSH 9 /* Cache flush command support */
#define VIRTIO_BLK_ID_BYTES (sizeof(__u16[256])) /* IDENTIFY DATA */ #define VIRTIO_BLK_ID_BYTES (sizeof(__u16[256])) /* IDENTIFY DATA */
@ -38,6 +36,17 @@ struct virtio_blk_config {
__u8 identify[VIRTIO_BLK_ID_BYTES]; __u8 identify[VIRTIO_BLK_ID_BYTES];
} __attribute__((packed)); } __attribute__((packed));
/*
* Command types
*
* Usage is a bit tricky as some bits are used as flags and some are not.
*
* Rules:
* VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or
* VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own
* and may not be combined with any of the other flags.
*/
/* These two define direction. */ /* These two define direction. */
#define VIRTIO_BLK_T_IN 0 #define VIRTIO_BLK_T_IN 0
#define VIRTIO_BLK_T_OUT 1 #define VIRTIO_BLK_T_OUT 1
@ -45,6 +54,9 @@ struct virtio_blk_config {
/* This bit says it's a scsi command, not an actual read or write. */ /* This bit says it's a scsi command, not an actual read or write. */
#define VIRTIO_BLK_T_SCSI_CMD 2 #define VIRTIO_BLK_T_SCSI_CMD 2
/* Cache flush command */
#define VIRTIO_BLK_T_FLUSH 4
/* Barrier before this op. */ /* Barrier before this op. */
#define VIRTIO_BLK_T_BARRIER 0x80000000 #define VIRTIO_BLK_T_BARRIER 0x80000000

3
include/linux/virtio_console.h
View File

@ -5,9 +5,6 @@
/* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so /* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
* anyone can use the definitions to implement compatible drivers/servers. */ * anyone can use the definitions to implement compatible drivers/servers. */
/* The ID for virtio console */
#define VIRTIO_ID_CONSOLE 3
/* Feature bits */ /* Feature bits */
#define VIRTIO_CONSOLE_F_SIZE 0 /* Does host provide console size? */ #define VIRTIO_CONSOLE_F_SIZE 0 /* Does host provide console size? */

17
include/linux/virtio_ids.h Normal file
View File

@ -0,0 +1,17 @@
#ifndef _LINUX_VIRTIO_IDS_H
#define _LINUX_VIRTIO_IDS_H
/*
* Virtio IDs
*
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*/
#define VIRTIO_ID_NET 1 /* virtio net */
#define VIRTIO_ID_BLOCK 2 /* virtio block */
#define VIRTIO_ID_CONSOLE 3 /* virtio console */
#define VIRTIO_ID_RNG 4 /* virtio ring */
#define VIRTIO_ID_BALLOON 5 /* virtio balloon */
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#endif /* _LINUX_VIRTIO_IDS_H */

3
include/linux/virtio_net.h
View File

@ -6,9 +6,6 @@
#include <linux/virtio_config.h> #include <linux/virtio_config.h>
#include <linux/if_ether.h> #include <linux/if_ether.h>
/* The ID for virtio_net */
#define VIRTIO_ID_NET 1
/* The feature bitmap for virtio net */ /* The feature bitmap for virtio net */
#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */

3
include/linux/virtio_rng.h
View File

@ -4,7 +4,4 @@
* compatible drivers/servers. */ * compatible drivers/servers. */
#include <linux/virtio_config.h> #include <linux/virtio_config.h>
/* The ID for virtio_rng */
#define VIRTIO_ID_RNG 4
#endif /* _LINUX_VIRTIO_RNG_H */ #endif /* _LINUX_VIRTIO_RNG_H */

5
net/9p/trans_virtio.c
View File

@ -43,6 +43,7 @@
#include <net/9p/transport.h> #include <net/9p/transport.h>
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
#include <linux/virtio.h> #include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_9p.h> #include <linux/virtio_9p.h>
#define VIRTQUEUE_NUM 128 #define VIRTQUEUE_NUM 128
@ -200,7 +201,7 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
req->status = REQ_STATUS_SENT; req->status = REQ_STATUS_SENT;
if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, req->tc)) { if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, req->tc) < 0) {
P9_DPRINTK(P9_DEBUG_TRANS, P9_DPRINTK(P9_DEBUG_TRANS,
"9p debug: virtio rpc add_buf returned failure"); "9p debug: virtio rpc add_buf returned failure");
return -EIO; return -EIO;
@ -334,8 +335,6 @@ static void p9_virtio_remove(struct virtio_device *vdev)
} }
} }
#define VIRTIO_ID_9P 9
static struct virtio_device_id id_table[] = { static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_9P, VIRTIO_DEV_ANY_ID }, { VIRTIO_ID_9P, VIRTIO_DEV_ANY_ID },
{ 0 }, { 0 },