The subject line says it all.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Signed-off-by: Abhishek Kane <v-abkane@xxxxxxxxxxxxx>
Signed-off-by: Hank Janssen <hjanssen@xxxxxxxxxxxxx>
---
drivers/staging/hv/hyperv_storage.h | 138 ++++++++++++++++++++++++++++++++++-
1 files changed, 136 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/hv/hyperv_storage.h b/drivers/staging/hv/hyperv_storage.h
index 4324493..93fac7c 100644
--- a/drivers/staging/hv/hyperv_storage.h
+++ b/drivers/staging/hv/hyperv_storage.h
@@ -22,6 +22,9 @@
*
*/
+#ifndef _HYPERV_STORAGE_H
+#define _HYPERV_STORAGE_H
+
/*
* vstorage.w revision number. This is used in the case
* of a version match, to alert the user that structure sizes may
@@ -29,8 +32,11 @@
* protocol versions match.
*/
-#ifndef _HYPERV_STORAGE_H
-#define _HYPERV_STORAGE_H
+#include <linux/kernel.h>
+#include <linux/atomic.h>
+#include <linux/completion.h>
+#include <linux/wait.h>
+
#define REVISION_STRING(REVISION_) #REVISION_
#define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \
@@ -198,4 +204,132 @@ struct vstor_packet {
/* This is the set of flags that the vsc can set in any packets it sends */
#define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG)
+/* Defines */
+#define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
+#define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
+
+#define STORVSC_MAX_IO_REQUESTS 128
+
+/*
+ * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
+ * reality, the path/target is not used (ie always set to 0) so our
+ * scsi host adapter essentially has 1 bus with 1 target that contains
+ * up to 256 luns.
+ */
+#define STORVSC_MAX_LUNS_PER_TARGET 64
+#define STORVSC_MAX_TARGETS 1
+#define STORVSC_MAX_CHANNELS 1
+
+struct hv_storvsc_request;
+
+/* Matches Windows-end */
+enum storvsc_request_type {
+ WRITE_TYPE,
+ READ_TYPE,
+ UNKNOWN_TYPE,
+};
+
+
+struct hv_storvsc_request {
+ struct hv_storvsc_request *request;
+ struct hv_device *device;
+
+ /* Synchronize the request/response if needed */
+ struct completion wait_event;
+
+ unsigned char *sense_buffer;
+ void *context;
+ void (*on_io_completion)(struct hv_storvsc_request *request);
+ struct hv_multipage_buffer data_buffer;
+
+ struct vstor_packet vstor_packet;
+};
+
+
+struct storvsc_device_info {
+ u32 ring_buffer_size;
+ unsigned int port_number;
+ unsigned char path_id;
+ unsigned char target_id;
+};
+
+struct storvsc_major_info {
+ int major;
+ int index;
+ bool do_register;
+ char *devname;
+ char *diskname;
+};
+
+/* A storvsc device is a device object that contains a vmbus channel */
+struct storvsc_device {
+ struct hv_device *device;
+
+ /* 0 indicates the device is being destroyed */
+ atomic_t ref_count;
+
+ bool drain_notify;
+ atomic_t num_outstanding_req;
+
+ wait_queue_head_t waiting_to_drain;
+
+ /*
+ * Each unique Port/Path/Target represents 1 channel ie scsi
+ * controller. In reality, the pathid, targetid is always 0
+ * and the port is set by us
+ */
+ unsigned int port_number;
+ unsigned char path_id;
+ unsigned char target_id;
+
+ /* Used for vsc/vsp channel reset process */
+ struct hv_storvsc_request init_request;
+ struct hv_storvsc_request reset_request;
+};
+
+
+/* Get the stordevice object iff exists and its refcount > 1 */
+static inline struct storvsc_device *get_stor_device(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = (struct storvsc_device *)device->ext;
+ if (stor_device && atomic_read(&stor_device->ref_count) > 1)
+ atomic_inc(&stor_device->ref_count);
+ else
+ stor_device = NULL;
+
+ return stor_device;
+}
+
+
+static inline void put_stor_device(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = (struct storvsc_device *)device->ext;
+
+ atomic_dec(&stor_device->ref_count);
+}
+
+static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
+{
+ dev->drain_notify = true;
+ wait_event(dev->waiting_to_drain,
+ atomic_read(&dev->num_outstanding_req) == 0);
+ dev->drain_notify = false;
+}
+
+/* Interface */
+
+int storvsc_dev_add(struct hv_device *device,
+ void *additional_info);
+int storvsc_dev_remove(struct hv_device *device);
+
+int storvsc_do_io(struct hv_device *device,
+ struct hv_storvsc_request *request);
+
+int storvsc_get_major_info(struct storvsc_device_info *device_info,
+ struct storvsc_major_info *major_info);
+
#endif /* _HYPERV_STORAGE_H */
--
1.7.4.1
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