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path: root/drivers/block/xen-blkback/common.h
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Diffstat (limited to 'drivers/block/xen-blkback/common.h')
-rw-r--r--drivers/block/xen-blkback/common.h138
1 files changed, 17 insertions, 121 deletions
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index ecb35fe8ca8d..b427d54bc120 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -36,7 +36,6 @@
#include <linux/io.h>
#include <linux/rbtree.h>
#include <asm/setup.h>
-#include <asm/pgalloc.h>
#include <asm/hypervisor.h>
#include <xen/grant_table.h>
#include <xen/page.h>
@@ -133,7 +132,7 @@ struct blkif_x86_32_request {
struct blkif_x86_64_request_rw {
uint8_t nr_segments; /* number of segments */
blkif_vdev_t handle; /* only for read/write requests */
- uint32_t _pad1; /* offsetof(blkif_reqest..,u.rw.id)==8 */
+ uint32_t _pad1; /* offsetof(blkif_request..,u.rw.id)==8 */
uint64_t id;
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
@@ -222,27 +221,20 @@ struct xen_vbd {
unsigned char type;
/* phys device that this vbd maps to. */
u32 pdevice;
- struct block_device *bdev;
+ struct file *bdev_file;
/* Cached size parameter. */
sector_t size;
unsigned int flush_support:1;
unsigned int discard_secure:1;
+ /* Connect-time cached feature_persistent parameter value */
+ unsigned int feature_gnt_persistent_parm:1;
+ /* Persistent grants feature negotiation result */
unsigned int feature_gnt_persistent:1;
unsigned int overflow_max_grants:1;
};
struct backend_info;
-/* Number of available flags */
-#define PERSISTENT_GNT_FLAGS_SIZE 2
-/* This persistent grant is currently in use */
-#define PERSISTENT_GNT_ACTIVE 0
-/*
- * This persistent grant has been used, this flag is set when we remove the
- * PERSISTENT_GNT_ACTIVE, to know that this grant has been used recently.
- */
-#define PERSISTENT_GNT_WAS_ACTIVE 1
-
/* Number of requests that we can fit in a ring */
#define XEN_BLKIF_REQS_PER_PAGE 32
@@ -250,7 +242,8 @@ struct persistent_gnt {
struct page *page;
grant_ref_t gnt;
grant_handle_t handle;
- DECLARE_BITMAP(flags, PERSISTENT_GNT_FLAGS_SIZE);
+ unsigned long last_used;
+ bool active;
struct rb_node node;
struct list_head remove_node;
};
@@ -278,7 +271,6 @@ struct xen_blkif_ring {
wait_queue_head_t pending_free_wq;
/* Tree to store persistent grants. */
- spinlock_t pers_gnts_lock;
struct rb_root persistent_gnts;
unsigned int persistent_gnt_c;
atomic_t persistent_gnt_in_use;
@@ -299,14 +291,12 @@ struct xen_blkif_ring {
struct work_struct persistent_purge_work;
/* Buffer of free pages to map grant refs. */
- spinlock_t free_pages_lock;
- int free_pages_num;
- struct list_head free_pages;
+ struct gnttab_page_cache free_pages;
struct work_struct free_work;
/* Thread shutdown wait queue. */
wait_queue_head_t shutdown_wq;
- struct xen_blkif *blkif;
+ struct xen_blkif *blkif;
};
struct xen_blkif {
@@ -325,10 +315,12 @@ struct xen_blkif {
atomic_t drain;
struct work_struct free_work;
- unsigned int nr_ring_pages;
+ unsigned int nr_ring_pages;
+ bool multi_ref;
/* All rings for this device. */
struct xen_blkif_ring *rings;
unsigned int nr_rings;
+ unsigned long buffer_squeeze_end;
};
struct seg_buf {
@@ -337,7 +329,7 @@ struct seg_buf {
};
struct grant_page {
- struct page *page;
+ struct page *page;
struct persistent_gnt *persistent_gnt;
grant_handle_t handle;
grant_ref_t gref;
@@ -368,9 +360,7 @@ struct pending_req {
};
-#define vbd_sz(_v) ((_v)->bdev->bd_part ? \
- (_v)->bdev->bd_part->nr_sects : \
- get_capacity((_v)->bdev->bd_disk))
+#define vbd_sz(_v) bdev_nr_sectors(file_bdev((_v)->bdev_file))
#define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt))
#define xen_blkif_put(_b) \
@@ -385,13 +375,15 @@ struct phys_req {
struct block_device *bdev;
blkif_sector_t sector_number;
};
+
int xen_blkif_interface_init(void);
+void xen_blkif_interface_fini(void);
int xen_blkif_xenbus_init(void);
+void xen_blkif_xenbus_fini(void);
irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
int xen_blkif_schedule(void *arg);
-int xen_blkif_purge_persistent(void *arg);
void xen_blkbk_free_caches(struct xen_blkif_ring *ring);
int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
@@ -402,100 +394,4 @@ int xen_blkbk_barrier(struct xenbus_transaction xbt,
struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
void xen_blkbk_unmap_purged_grants(struct work_struct *work);
-static inline void blkif_get_x86_32_req(struct blkif_request *dst,
- struct blkif_x86_32_request *src)
-{
- int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j;
- dst->operation = READ_ONCE(src->operation);
- switch (dst->operation) {
- case BLKIF_OP_READ:
- case BLKIF_OP_WRITE:
- case BLKIF_OP_WRITE_BARRIER:
- case BLKIF_OP_FLUSH_DISKCACHE:
- dst->u.rw.nr_segments = src->u.rw.nr_segments;
- dst->u.rw.handle = src->u.rw.handle;
- dst->u.rw.id = src->u.rw.id;
- dst->u.rw.sector_number = src->u.rw.sector_number;
- barrier();
- if (n > dst->u.rw.nr_segments)
- n = dst->u.rw.nr_segments;
- for (i = 0; i < n; i++)
- dst->u.rw.seg[i] = src->u.rw.seg[i];
- break;
- case BLKIF_OP_DISCARD:
- dst->u.discard.flag = src->u.discard.flag;
- dst->u.discard.id = src->u.discard.id;
- dst->u.discard.sector_number = src->u.discard.sector_number;
- dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
- break;
- case BLKIF_OP_INDIRECT:
- dst->u.indirect.indirect_op = src->u.indirect.indirect_op;
- dst->u.indirect.nr_segments = src->u.indirect.nr_segments;
- dst->u.indirect.handle = src->u.indirect.handle;
- dst->u.indirect.id = src->u.indirect.id;
- dst->u.indirect.sector_number = src->u.indirect.sector_number;
- barrier();
- j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments));
- for (i = 0; i < j; i++)
- dst->u.indirect.indirect_grefs[i] =
- src->u.indirect.indirect_grefs[i];
- break;
- default:
- /*
- * Don't know how to translate this op. Only get the
- * ID so failure can be reported to the frontend.
- */
- dst->u.other.id = src->u.other.id;
- break;
- }
-}
-
-static inline void blkif_get_x86_64_req(struct blkif_request *dst,
- struct blkif_x86_64_request *src)
-{
- int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j;
- dst->operation = READ_ONCE(src->operation);
- switch (dst->operation) {
- case BLKIF_OP_READ:
- case BLKIF_OP_WRITE:
- case BLKIF_OP_WRITE_BARRIER:
- case BLKIF_OP_FLUSH_DISKCACHE:
- dst->u.rw.nr_segments = src->u.rw.nr_segments;
- dst->u.rw.handle = src->u.rw.handle;
- dst->u.rw.id = src->u.rw.id;
- dst->u.rw.sector_number = src->u.rw.sector_number;
- barrier();
- if (n > dst->u.rw.nr_segments)
- n = dst->u.rw.nr_segments;
- for (i = 0; i < n; i++)
- dst->u.rw.seg[i] = src->u.rw.seg[i];
- break;
- case BLKIF_OP_DISCARD:
- dst->u.discard.flag = src->u.discard.flag;
- dst->u.discard.id = src->u.discard.id;
- dst->u.discard.sector_number = src->u.discard.sector_number;
- dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
- break;
- case BLKIF_OP_INDIRECT:
- dst->u.indirect.indirect_op = src->u.indirect.indirect_op;
- dst->u.indirect.nr_segments = src->u.indirect.nr_segments;
- dst->u.indirect.handle = src->u.indirect.handle;
- dst->u.indirect.id = src->u.indirect.id;
- dst->u.indirect.sector_number = src->u.indirect.sector_number;
- barrier();
- j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments));
- for (i = 0; i < j; i++)
- dst->u.indirect.indirect_grefs[i] =
- src->u.indirect.indirect_grefs[i];
- break;
- default:
- /*
- * Don't know how to translate this op. Only get the
- * ID so failure can be reported to the frontend.
- */
- dst->u.other.id = src->u.other.id;
- break;
- }
-}
-
#endif /* __XEN_BLKIF__BACKEND__COMMON_H__ */
generated by cgit (git 2.34.1) at 2025-12-29 11:30:27 +0000