according to virtio spec, add feature VIRTIO_BLK_F_SIZE_MAX
and VIRTIO_BLK_F_SEG_MAX parse to virtio blk driver.
Signed-off-by: dinglimin <dinglimin(a)cmss.chinamobile.com>
Signed-off-by: Andy Pei <andy.pei(a)intel.com>
---
src/block.h | 2 ++
src/hw/virtio-blk.c | 46 ++++++++++++++++++++++++++++++++++++++++++++--
src/hw/virtio-blk.h | 3 +++
3 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/src/block.h b/src/block.h
index c1b8d73..3af2d71 100644
--- a/src/block.h
+++ b/src/block.h
@@ -57,6 +57,8 @@ struct drive_s {
u8 translation; // type of translation
u16 blksize; // block size
struct chs_s pchs; // Physical CHS
+ u32 max_segment_size; //max_segment_size
+ u32 max_segments; //max_segments
};
#define DISK_SECTOR_SIZE 512
diff --git a/src/hw/virtio-blk.c b/src/hw/virtio-blk.c
index 3b19896..f315839 100644
--- a/src/hw/virtio-blk.c
+++ b/src/hw/virtio-blk.c
@@ -121,12 +121,16 @@ init_virtio_blk(void *data)
u64 version1 = 1ull << VIRTIO_F_VERSION_1;
u64 iommu_platform = 1ull << VIRTIO_F_IOMMU_PLATFORM;
u64 blk_size = 1ull << VIRTIO_BLK_F_BLK_SIZE;
+ u64 max_segments = 1ull << VIRTIO_BLK_F_SEG_MAX;
+ u64 max_segment_size = 1ull << VIRTIO_BLK_F_SIZE_MAX;
+
if (!(features & version1)) {
dprintf(1, "modern device without virtio_1 feature bit: %pP\n", pci);
goto fail;
}
- features = features & (version1 | iommu_platform | blk_size);
+ features = features & (version1 | iommu_platform | blk_size
+ | max_segments | max_segment_size);
vp_set_features(vp, features);
status |= VIRTIO_CONFIG_S_FEATURES_OK;
vp_set_status(vp, status);
@@ -135,6 +139,18 @@ init_virtio_blk(void *data)
goto fail;
}
+ if (features & max_segment_size)
+ vdrive->drive.max_segment_size =
+ vp_read(&vp->device, struct virtio_blk_config, size_max);
+ else
+ vdrive->drive.max_segment_size = 0;
+
+ if (features & max_segments)
+ vdrive->drive.max_segments =
+ vp_read(&vp->device, struct virtio_blk_config, seg_max);
+ else
+ vdrive->drive.max_segments = 0;
+
vdrive->drive.sectors =
vp_read(&vp->device, struct virtio_blk_config, capacity);
if (features & blk_size) {
@@ -177,6 +193,17 @@ init_virtio_blk(void *data)
vdrive->drive.pchs.cylinder = cfg.cylinders;
vdrive->drive.pchs.head = cfg.heads;
vdrive->drive.pchs.sector = cfg.sectors;
+
+ if (f & (1 << VIRTIO_BLK_F_SIZE_MAX))
+ vdrive->drive.max_segment_size = cfg.size_max;
+ else
+ vdrive->drive.max_segment_size = 0;
+
+ if (f & (1 << VIRTIO_BLK_F_SEG_MAX))
+ vdrive->drive.max_segments = cfg.seg_max;
+ else
+ vdrive->drive.max_segments = 0;
+
}
char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%pP", pci);
@@ -218,8 +245,11 @@ init_virtio_blk_mmio(void *mmio)
u64 features = vp_get_features(vp);
u64 version1 = 1ull << VIRTIO_F_VERSION_1;
u64 blk_size = 1ull << VIRTIO_BLK_F_BLK_SIZE;
+ u64 max_segments = 1ull << VIRTIO_BLK_F_SEG_MAX;
+ u64 max_segment_size = 1ull << VIRTIO_BLK_F_SIZE_MAX;
- features = features & (version1 | blk_size);
+ features = features & (version1 | blk_size
+ | max_segments | max_segment_size);
vp_set_features(vp, features);
status |= VIRTIO_CONFIG_S_FEATURES_OK;
vp_set_status(vp, status);
@@ -228,6 +258,18 @@ init_virtio_blk_mmio(void *mmio)
goto fail;
}
+ if (features & max_segment_size)
+ vdrive->drive.max_segment_size =
+ vp_read(&vp->device, struct virtio_blk_config, size_max);
+ else
+ vdrive->drive.max_segment_size = 0;
+
+ if (features & max_segments)
+ vdrive->drive.max_segments =
+ vp_read(&vp->device, struct virtio_blk_config, seg_max);
+ else
+ vdrive->drive.max_segments = 0;
+
vdrive->drive.sectors =
vp_read(&vp->device, struct virtio_blk_config, capacity);
if (features & blk_size) {
diff --git a/src/hw/virtio-blk.h b/src/hw/virtio-blk.h
index d20461a..0294291 100644
--- a/src/hw/virtio-blk.h
+++ b/src/hw/virtio-blk.h
@@ -16,6 +16,9 @@ struct virtio_blk_config
u32 opt_io_size;
} __attribute__((packed));
+/* Feature bits */
+#define VIRTIO_BLK_F_SIZE_MAX 1 /* Maximum size of any single segment */
+#define VIRTIO_BLK_F_SEG_MAX 2 /* Maximum number of segments in a request */
#define VIRTIO_BLK_F_BLK_SIZE 6
/* These two define direction. */
--
1.8.3.1
