From de979b1f256be8488f49a78646dee1ded06251ef Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 20 Jan 2014 12:49:40 +0100 Subject: [PATCH 2/4] scsi-disk: add UNMAP limits to block limits VPD page RH-Author: Paolo Bonzini Message-id: <1390222180-24891-1-git-send-email-pbonzini@redhat.com> Patchwork-id: 56831 O-Subject: [RHEL 7.0 qemu-kvm PATCH] scsi-disk: add UNMAP limits to block limits VPD page Bugzilla: 1037503 RH-Acked-by: Orit Wasserman RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Fam Zheng Bugzilla: 1037503 Brew build: 6896455 Linux prefers WRITE SAME to UNMAP if the limits are zero, and WRITE SAME does not discard anything unless the device can guarantee that the resulting block is zero. Setting the maximum unmap block and descriptor counts to non-zero makes Linux choose UNMAP and fixes thin provisioning on glusterfs. While the maximum unmap block count can have some effect on performance, the (suggested) maximum number of descriptors is not particularly important so I didn't add a customization option. SCSI drivers are used to online firmware updates so I'm not yet adding versioning support for SCSI, but we're probably getting close to the point when it's worth thinking about it. Reported-by: Bharata B Rao Signed-off-by: Paolo Bonzini (cherry picked from commit 8a1bd2973ed5f99a3c37c9afdff823c4a22152b1) --- hw/scsi/scsi-disk.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) Signed-off-by: Miroslav Rezanina --- hw/scsi/scsi-disk.c | 20 ++++++++++++++++++++ 1 files changed, 20 insertions(+), 0 deletions(-) diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index 7653411..bce617c 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -47,6 +47,7 @@ do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0) #define SCSI_MAX_MODE_LEN 256 #define DEFAULT_DISCARD_GRANULARITY 4096 +#define DEFAULT_MAX_UNMAP_SIZE (1 << 30) /* 1 GB */ typedef struct SCSIDiskState SCSIDiskState; @@ -74,6 +75,7 @@ struct SCSIDiskState bool media_event; bool eject_request; uint64_t wwn; + uint64_t max_unmap_size; QEMUBH *bh; char *version; char *serial; @@ -625,6 +627,8 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf) s->qdev.conf.min_io_size / s->qdev.blocksize; unsigned int opt_io_size = s->qdev.conf.opt_io_size / s->qdev.blocksize; + unsigned int max_unmap_sectors = + s->max_unmap_size / s->qdev.blocksize; if (s->qdev.type == TYPE_ROM) { DPRINTF("Inquiry (EVPD[%02X] not supported for CDROM\n", @@ -647,6 +651,18 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf) outbuf[14] = (opt_io_size >> 8) & 0xff; outbuf[15] = opt_io_size & 0xff; + /* max unmap LBA count, default is 1GB */ + outbuf[20] = (max_unmap_sectors >> 24) & 0xff; + outbuf[21] = (max_unmap_sectors >> 16) & 0xff; + outbuf[22] = (max_unmap_sectors >> 8) & 0xff; + outbuf[23] = max_unmap_sectors & 0xff; + + /* max unmap descriptors, 255 fit in 4 kb with an 8-byte header. */ + outbuf[24] = 0; + outbuf[25] = 0; + outbuf[26] = 0; + outbuf[27] = 255; + /* optimal unmap granularity */ outbuf[28] = (unmap_sectors >> 24) & 0xff; outbuf[29] = (unmap_sectors >> 16) & 0xff; @@ -2519,6 +2535,8 @@ static Property scsi_hd_properties[] = { DEFINE_PROP_BIT("dpofua", SCSIDiskState, features, SCSI_DISK_F_DPOFUA, false), DEFINE_PROP_HEX64("wwn", SCSIDiskState, wwn, 0), + DEFINE_PROP_UINT64("max_unmap_size", SCSIDiskState, max_unmap_size, + DEFAULT_MAX_UNMAP_SIZE), DEFINE_BLOCK_CHS_PROPERTIES(SCSIDiskState, qdev.conf), DEFINE_PROP_END_OF_LIST(), }; @@ -2628,6 +2646,8 @@ static Property scsi_disk_properties[] = { DEFINE_PROP_BIT("dpofua", SCSIDiskState, features, SCSI_DISK_F_DPOFUA, false), DEFINE_PROP_HEX64("wwn", SCSIDiskState, wwn, 0), + DEFINE_PROP_UINT64("max_unmap_size", SCSIDiskState, max_unmap_size, + DEFAULT_MAX_UNMAP_SIZE), DEFINE_PROP_END_OF_LIST(), }; -- 1.7.1