#include <linux/list.h>
#include <xen/balloon.h>
#include <asm/hypervisor.h>
+#include <asm/hypercall.h>
#include "common.h"
/*
module_param_named(reqs, blkif_reqs, int, 0);
MODULE_PARM_DESC(reqs, "Number of blkback requests to allocate");
-static int mmap_pages;
-
/* Run-time switchable: /sys/module/blkback/parameters/ */
static unsigned int log_stats = 0;
static unsigned int debug_lvl = 0;
#define BLKBACK_INVALID_HANDLE (~0)
-static unsigned long mmap_vstart;
-static unsigned long *pending_vaddrs;
+static struct page **pending_pages;
static grant_handle_t *pending_grant_handles;
static inline int vaddr_pagenr(pending_req_t *req, int seg)
static inline unsigned long vaddr(pending_req_t *req, int seg)
{
- return pending_vaddrs[vaddr_pagenr(req, seg)];
+ unsigned long pfn = page_to_pfn(pending_pages[vaddr_pagenr(req, seg)]);
+ return (unsigned long)pfn_to_kaddr(pfn);
}
#define pending_handle(_req, _seg) \
wake_up(&blkif->wq);
}
-irqreturn_t blkif_be_int(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t blkif_be_int(int irq, void *dev_id)
{
blkif_notify_work(dev_id);
return IRQ_HANDLED;
static int do_block_io_op(blkif_t *blkif)
{
blkif_back_ring_t *blk_ring = &blkif->blk_ring;
- blkif_request_t *req;
+ blkif_request_t req;
pending_req_t *pending_req;
RING_IDX rc, rp;
int more_to_do = 0;
break;
}
- req = RING_GET_REQUEST(blk_ring, rc);
+ memcpy(&req, RING_GET_REQUEST(blk_ring, rc), sizeof(req));
blk_ring->req_cons = ++rc; /* before make_response() */
- switch (req->operation) {
+ switch (req.operation) {
case BLKIF_OP_READ:
blkif->st_rd_req++;
- dispatch_rw_block_io(blkif, req, pending_req);
+ dispatch_rw_block_io(blkif, &req, pending_req);
break;
case BLKIF_OP_WRITE:
blkif->st_wr_req++;
- dispatch_rw_block_io(blkif, req, pending_req);
+ dispatch_rw_block_io(blkif, &req, pending_req);
break;
default:
DPRINTK("error: unknown block io operation [%d]\n",
- req->operation);
- make_response(blkif, req->id, req->operation,
+ req.operation);
+ make_response(blkif, req.id, req.operation,
BLKIF_RSP_ERROR);
free_req(pending_req);
break;
blkif_request_t *req,
pending_req_t *pending_req)
{
- extern void ll_rw_block(int rw, int nr, struct buffer_head * bhs[]);
+ extern void ll_rw_block(int rw, int nr, struct buffer_head * bhs[]);
int operation = (req->operation == BLKIF_OP_WRITE) ? WRITE : READ;
struct gnttab_map_grant_ref map[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct phys_req preq;
req->seg[i].first_sect + 1;
if ((req->seg[i].last_sect >= (PAGE_SIZE >> 9)) ||
- (seg[i].nsec <= 0))
+ (req->seg[i].last_sect < req->seg[i].first_sect))
goto fail_response;
preq.nr_sects += seg[i].nsec;
for (i = 0; i < nseg; i++) {
if (unlikely(map[i].status != 0)) {
DPRINTK("invalid buffer -- could not remap it\n");
- goto fail_flush;
+ map[i].handle = BLKBACK_INVALID_HANDLE;
+ ret |= 1;
}
pending_handle(pending_req, i) = map[i].handle;
+
+ if (ret)
+ continue;
+
set_phys_to_machine(__pa(vaddr(
pending_req, i)) >> PAGE_SHIFT,
FOREIGN_FRAME(map[i].dev_bus_addr >> PAGE_SHIFT));
(req->seg[i].first_sect << 9);
}
+ if (ret)
+ goto fail_flush;
+
if (vbd_translate(&preq, blkif, operation) != 0) {
DPRINTK("access denied: %s of [%llu,%llu] on dev=%04x\n",
operation == READ ? "read" : "write",
preq.sector_number,
- preq.sector_number + preq.nr_sects, preq.dev);
+ preq.sector_number + preq.nr_sects, preq.dev);
goto fail_flush;
}
static int __init blkif_init(void)
{
- struct page *page;
- int i;
+ int i, mmap_pages;
if (!is_running_on_xen())
return -ENODEV;
- mmap_pages = blkif_reqs * BLKIF_MAX_SEGMENTS_PER_REQUEST;
-
-#ifdef CONFIG_XEN_IA64_DOM0_NON_VP
- extern unsigned long alloc_empty_foreign_map_page_range(
- unsigned long pages);
- mmap_vstart = (unsigned long)
- alloc_empty_foreign_map_page_range(mmap_pages);
-#else /* ! ia64 */
- page = balloon_alloc_empty_page_range(mmap_pages);
- if (page == NULL)
- return -ENOMEM;
- mmap_vstart = (unsigned long)pfn_to_kaddr(page_to_pfn(page));
-#endif
+ mmap_pages = blkif_reqs * BLKIF_MAX_SEGMENTS_PER_REQUEST;
pending_reqs = kmalloc(sizeof(pending_reqs[0]) *
blkif_reqs, GFP_KERNEL);
pending_grant_handles = kmalloc(sizeof(pending_grant_handles[0]) *
mmap_pages, GFP_KERNEL);
- pending_vaddrs = kmalloc(sizeof(pending_vaddrs[0]) *
- mmap_pages, GFP_KERNEL);
- if (!pending_reqs || !pending_grant_handles || !pending_vaddrs) {
- kfree(pending_reqs);
- kfree(pending_grant_handles);
- kfree(pending_vaddrs);
- printk("%s: out of memory\n", __FUNCTION__);
- return -ENOMEM;
- }
+ pending_pages = alloc_empty_pages_and_pagevec(mmap_pages);
- blkif_interface_init();
-
- printk("%s: reqs=%d, pages=%d, mmap_vstart=0x%lx\n",
- __FUNCTION__, blkif_reqs, mmap_pages, mmap_vstart);
- BUG_ON(mmap_vstart == 0);
- for (i = 0; i < mmap_pages; i++) {
- pending_vaddrs[i] = mmap_vstart + (i << PAGE_SHIFT);
+ if (!pending_reqs || !pending_grant_handles || !pending_pages)
+ goto out_of_memory;
+
+ for (i = 0; i < mmap_pages; i++)
pending_grant_handles[i] = BLKBACK_INVALID_HANDLE;
- }
+
+ blkif_interface_init();
memset(pending_reqs, 0, sizeof(pending_reqs));
INIT_LIST_HEAD(&pending_free);
for (i = 0; i < blkif_reqs; i++)
list_add_tail(&pending_reqs[i].free_list, &pending_free);
-
+
blkif_xenbus_init();
return 0;
+
+ out_of_memory:
+ kfree(pending_reqs);
+ kfree(pending_grant_handles);
+ free_empty_pages_and_pagevec(pending_pages, mmap_pages);
+ printk("%s: out of memory\n", __FUNCTION__);
+ return -ENOMEM;
}
module_init(blkif_init);