These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / scsi / snic / vnic_intr.h

diff --git a/kernel/drivers/scsi/snic/vnic_intr.h b/kernel/drivers/scsi/snic/vnic_intr.h
new file mode 100644 (file)
index 0000000..4547f60
--- /dev/null
+++ b/kernel/drivers/scsi/snic/vnic_intr.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2014 Cisco 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_INTR_H_
+#define _VNIC_INTR_H_
+
+#include <linux/pci.h>
+#include "vnic_dev.h"
+
+#define VNIC_INTR_TIMER_MAX            0xffff
+
+#define VNIC_INTR_TIMER_TYPE_ABS       0
+#define VNIC_INTR_TIMER_TYPE_QUIET     1
+
+/* Interrupt control */
+struct vnic_intr_ctrl {
+       u32 coalescing_timer;           /* 0x00 */
+       u32 pad0;
+       u32 coalescing_value;           /* 0x08 */
+       u32 pad1;
+       u32 coalescing_type;            /* 0x10 */
+       u32 pad2;
+       u32 mask_on_assertion;          /* 0x18 */
+       u32 pad3;
+       u32 mask;                       /* 0x20 */
+       u32 pad4;
+       u32 int_credits;                /* 0x28 */
+       u32 pad5;
+       u32 int_credit_return;          /* 0x30 */
+       u32 pad6;
+};
+
+struct vnic_intr {
+       unsigned int index;
+       struct vnic_dev *vdev;
+       struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
+};
+
+static inline void
+svnic_intr_unmask(struct vnic_intr *intr)
+{
+       iowrite32(0, &intr->ctrl->mask);
+}
+
+static inline void
+svnic_intr_mask(struct vnic_intr *intr)
+{
+       iowrite32(1, &intr->ctrl->mask);
+}
+
+static inline void
+svnic_intr_return_credits(struct vnic_intr *intr,
+                         unsigned int credits,
+                         int unmask,
+                         int reset_timer)
+{
+#define VNIC_INTR_UNMASK_SHIFT         16
+#define VNIC_INTR_RESET_TIMER_SHIFT    17
+
+       u32 int_credit_return = (credits & 0xffff) |
+               (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
+               (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
+
+       iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
+}
+
+static inline unsigned int
+svnic_intr_credits(struct vnic_intr *intr)
+{
+       return ioread32(&intr->ctrl->int_credits);
+}
+
+static inline void
+svnic_intr_return_all_credits(struct vnic_intr *intr)
+{
+       unsigned int credits = svnic_intr_credits(intr);
+       int unmask = 1;
+       int reset_timer = 1;
+
+       svnic_intr_return_credits(intr, credits, unmask, reset_timer);
+}
+
+void svnic_intr_free(struct vnic_intr *);
+int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
+void svnic_intr_init(struct vnic_intr *intr,
+                    unsigned int coalescing_timer,
+                    unsigned int coalescing_type,
+                    unsigned int mask_on_assertion);
+void svnic_intr_clean(struct vnic_intr *);
+
+#endif /* _VNIC_INTR_H_ */