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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2009-05-29 10:04:24 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-05-29 10:04:24 +0100
commit42f1d2e06a25628ae4ceaadccc4fa67c7787e2b4 (patch)
tree8aac83e399de7ad13748a59853a0feea9ed2c5cb /drivers/scsi/fnic/vnic_wq_copy.h
parent9af5324a070e0b2dcb6e22c89e17424eba245fcc (diff)
parent77bbca138c64cb80259732db6f70e1668123f2a7 (diff)
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci into devel
Diffstat (limited to 'drivers/scsi/fnic/vnic_wq_copy.h')
-rw-r--r--drivers/scsi/fnic/vnic_wq_copy.h128
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/scsi/fnic/vnic_wq_copy.h b/drivers/scsi/fnic/vnic_wq_copy.h
new file mode 100644
index 00000000000..6aff9740c3d
--- /dev/null
+++ b/drivers/scsi/fnic/vnic_wq_copy.h
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2008 Cisco Systems, Inc. All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef _VNIC_WQ_COPY_H_
+#define _VNIC_WQ_COPY_H_
+
+#include <linux/pci.h>
+#include "vnic_wq.h"
+#include "fcpio.h"
+
+#define VNIC_WQ_COPY_MAX 1
+
+struct vnic_wq_copy {
+ unsigned int index;
+ struct vnic_dev *vdev;
+ struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
+ struct vnic_dev_ring ring;
+ unsigned to_use_index;
+ unsigned to_clean_index;
+};
+
+static inline unsigned int vnic_wq_copy_desc_avail(struct vnic_wq_copy *wq)
+{
+ return wq->ring.desc_avail;
+}
+
+static inline unsigned int vnic_wq_copy_desc_in_use(struct vnic_wq_copy *wq)
+{
+ return wq->ring.desc_count - 1 - wq->ring.desc_avail;
+}
+
+static inline void *vnic_wq_copy_next_desc(struct vnic_wq_copy *wq)
+{
+ struct fcpio_host_req *desc = wq->ring.descs;
+ return &desc[wq->to_use_index];
+}
+
+static inline void vnic_wq_copy_post(struct vnic_wq_copy *wq)
+{
+
+ ((wq->to_use_index + 1) == wq->ring.desc_count) ?
+ (wq->to_use_index = 0) : (wq->to_use_index++);
+ wq->ring.desc_avail--;
+
+ /* Adding write memory barrier prevents compiler and/or CPU
+ * reordering, thus avoiding descriptor posting before
+ * descriptor is initialized. Otherwise, hardware can read
+ * stale descriptor fields.
+ */
+ wmb();
+
+ iowrite32(wq->to_use_index, &wq->ctrl->posted_index);
+}
+
+static inline void vnic_wq_copy_desc_process(struct vnic_wq_copy *wq, u16 index)
+{
+ unsigned int cnt;
+
+ if (wq->to_clean_index <= index)
+ cnt = (index - wq->to_clean_index) + 1;
+ else
+ cnt = wq->ring.desc_count - wq->to_clean_index + index + 1;
+
+ wq->to_clean_index = ((index + 1) % wq->ring.desc_count);
+ wq->ring.desc_avail += cnt;
+
+}
+
+static inline void vnic_wq_copy_service(struct vnic_wq_copy *wq,
+ u16 completed_index,
+ void (*q_service)(struct vnic_wq_copy *wq,
+ struct fcpio_host_req *wq_desc))
+{
+ struct fcpio_host_req *wq_desc = wq->ring.descs;
+ unsigned int curr_index;
+
+ while (1) {
+
+ if (q_service)
+ (*q_service)(wq, &wq_desc[wq->to_clean_index]);
+
+ wq->ring.desc_avail++;
+
+ curr_index = wq->to_clean_index;
+
+ /* increment the to-clean index so that we start
+ * with an unprocessed index next time we enter the loop
+ */
+ ((wq->to_clean_index + 1) == wq->ring.desc_count) ?
+ (wq->to_clean_index = 0) : (wq->to_clean_index++);
+
+ if (curr_index == completed_index)
+ break;
+
+ /* we have cleaned all the entries */
+ if ((completed_index == (u16)-1) &&
+ (wq->to_clean_index == wq->to_use_index))
+ break;
+ }
+}
+
+void vnic_wq_copy_enable(struct vnic_wq_copy *wq);
+int vnic_wq_copy_disable(struct vnic_wq_copy *wq);
+void vnic_wq_copy_free(struct vnic_wq_copy *wq);
+int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
+ unsigned int index, unsigned int desc_count, unsigned int desc_size);
+void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
+ unsigned int error_interrupt_enable,
+ unsigned int error_interrupt_offset);
+void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
+ void (*q_clean)(struct vnic_wq_copy *wq,
+ struct fcpio_host_req *wq_desc));
+
+#endif /* _VNIC_WQ_COPY_H_ */