#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 struct page **pending_pages;
+static unsigned long mmap_vstart;
+static unsigned long *pending_vaddrs;
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)
{
- unsigned long pfn = page_to_pfn(pending_pages[vaddr_pagenr(req, seg)]);
- return (unsigned long)pfn_to_kaddr(pfn);
+ return pending_vaddrs[vaddr_pagenr(req, seg)];
}
#define pending_handle(_req, _seg) \
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;
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)
{
- int i, mmap_pages;
+ struct page *page;
+ int i;
if (!is_running_on_xen())
return -ENODEV;
- mmap_pages = blkif_reqs * BLKIF_MAX_SEGMENTS_PER_REQUEST;
+ 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
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_pages = alloc_empty_pages_and_pagevec(mmap_pages);
-
- 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;
+ 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;
+ }
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);
+ pending_grant_handles[i] = BLKBACK_INVALID_HANDLE;
+ }
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);