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[Qemu-devel] [RFC PATCH v2 04/13] scsi: let a SCSIDevice have children d
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [RFC PATCH v2 04/13] scsi: let a SCSIDevice have children devices |
Date: |
Mon, 6 Jun 2011 18:04:13 +0200 |
This provides the infrastructure for simple devices to pick LUNs.
Of course, this will not do anything until there is a device that
can report the existence of those LUNs.
Signed-off-by: Paolo Bonzini <address@hidden>
---
hw/esp.c | 4 +++-
hw/lsi53c895a.c | 2 +-
hw/scsi-bus.c | 15 +++++++++++++++
hw/scsi.h | 3 +++
4 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/hw/esp.c b/hw/esp.c
index e47dfec..a821a0a 100644
--- a/hw/esp.c
+++ b/hw/esp.c
@@ -239,12 +239,14 @@ static uint32_t get_cmd(ESPState *s, uint8_t *buf)
static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
{
+ SCSIDevice *dev;
int32_t datalen;
int lun;
DPRINTF("do_busid_cmd: busid 0x%x\n", busid);
lun = busid & 7;
- s->current_req = scsi_req_new(s->current_dev, &s->busdev.qdev, 0, lun);
+ dev = scsi_find_lun(s->current_dev, lun, buf);
+ s->current_req = scsi_req_new(dev, &s->busdev.qdev, 0, lun);
datalen = scsi_req_enqueue(s->current_req, buf);
s->ti_size = datalen;
if (datalen != 0) {
diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c
index 96b19f9..a908324 100644
--- a/hw/lsi53c895a.c
+++ b/hw/lsi53c895a.c
@@ -780,7 +780,7 @@ static void lsi_do_command(LSIState *s)
s->command_complete = 0;
id = (s->select_tag >> 8) & 0xf;
- dev = s->bus.devs[id];
+ dev = scsi_find_lun(s->bus.devs[id], s->current_lun, buf);
if (!dev) {
lsi_bad_selection(s, id);
return;
diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
index 24e91bf..b44f308 100644
--- a/hw/scsi-bus.c
+++ b/hw/scsi-bus.c
@@ -745,6 +745,21 @@ static char *scsibus_get_fw_dev_path(DeviceState *dev)
return strdup(path);
}
+/* Simplified walk of the SCSI bus hierarchy, for devices that only support
+ one bus and only flat-space LUNs (typically 3-bit ones!). */
+SCSIDevice *scsi_find_lun(SCSIDevice *sdev, int lun, uint8_t *cdb)
+{
+ SCSIBus *sbus = sdev->children;
+ if (!sbus ||
+ lun < 0 ||
+ (lun == 0 && cdb[0] == REPORT_LUNS) ||
+ lun >= sbus->ndev || sbus->devs[lun] == NULL) {
+ return sdev;
+ } else {
+ return sbus->devs[lun];
+ }
+}
+
/* Decode the bus and level parts of a LUN, as defined in the SCSI architecture
model. If false is returned, the LUN could not be parsed. If true
is return, "*bus" and "*target" identify the next two steps in the
diff --git a/hw/scsi.h b/hw/scsi.h
index fa3ca9b..8d5737b 100644
--- a/hw/scsi.h
+++ b/hw/scsi.h
@@ -59,6 +59,7 @@ struct SCSIDevice
uint32_t id;
BlockConf conf;
SCSIDeviceInfo *info;
+ SCSIBus *children;
QTAILQ_HEAD(, SCSIRequest) requests;
int blocksize;
int type;
@@ -152,7 +153,9 @@ extern const struct SCSISense sense_code_LUN_FAILURE;
int scsi_build_sense(SCSISense sense, uint8_t *buf, int len, int fixed);
int scsi_sense_valid(SCSISense sense);
+
SCSIDevice *scsi_decode_lun(SCSIBus *sbus, uint64_t sam_lun, int *lun);
+SCSIDevice *scsi_find_lun(SCSIDevice *sdev, int lun, uint8_t *cdb);
SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, DeviceState *initiator,
uint32_t tag, uint32_t lun);
--
1.7.4.4
- [Qemu-devel] [RFC PATCH v2 00/13] support hierarchical LUNs, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 02/13] scsi: support parsing of SAM logical unit numbers, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 01/13] scsi: cleanup reset and destroy callbacks, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 03/13] scsi: add initiator field to SCSIRequest, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 04/13] scsi: let a SCSIDevice have children devices,
Paolo Bonzini <=
- [Qemu-devel] [RFC PATCH v2 05/13] scsi: let the bus pick a LUN for the child device, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 06/13] scsi-generic: fix passthrough of devices with LUN != 0, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 07/13] scsi: add walking of hierarchical LUNs, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 08/13] scsi: introduce the scsi-path device, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 09/13] scsi: introduce the scsi-target device, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 10/13] scsi: include bus and device levels, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 11/13] qdev: introduce automatic creation of buses, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 12/13] scsi: create scsi-path and scsi-target devices automatically, Paolo Bonzini, 2011/06/06
- [Qemu-devel] [RFC PATCH v2 13/13] scsi: delete handling of REPORT LUNS and unknown LUNs outside scsi-target, Paolo Bonzini, 2011/06/06