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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/scsi/fnic/vnic_wq.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/scsi/fnic/vnic_wq.c')
-rw-r--r--drivers/scsi/fnic/vnic_wq.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/scsi/fnic/vnic_wq.c b/drivers/scsi/fnic/vnic_wq.c
new file mode 100644
index 000000000..426b901c8
--- /dev/null
+++ b/drivers/scsi/fnic/vnic_wq.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2008 Cisco Systems, Inc. All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc. All rights reserved.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include "vnic_dev.h"
+#include "vnic_wq.h"
+
+
+static int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
+ unsigned int index, enum vnic_res_type res_type)
+{
+ wq->ctrl = vnic_dev_get_res(vdev, res_type, index);
+
+ if (!wq->ctrl)
+ return -EINVAL;
+
+ return 0;
+}
+
+
+static int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
+ unsigned int desc_count, unsigned int desc_size)
+{
+ return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
+}
+
+
+static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
+{
+ struct vnic_wq_buf *buf;
+ unsigned int i, j, count = wq->ring.desc_count;
+ unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
+
+ for (i = 0; i < blks; i++) {
+ wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
+ if (!wq->bufs[i]) {
+ printk(KERN_ERR "Failed to alloc wq_bufs\n");
+ return -ENOMEM;
+ }
+ }
+
+ for (i = 0; i < blks; i++) {
+ buf = wq->bufs[i];
+ for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
+ buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
+ buf->desc = (u8 *)wq->ring.descs +
+ wq->ring.desc_size * buf->index;
+ if (buf->index + 1 == count) {
+ buf->next = wq->bufs[0];
+ break;
+ } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
+ buf->next = wq->bufs[i + 1];
+ } else {
+ buf->next = buf + 1;
+ buf++;
+ }
+ }
+ }
+
+ wq->to_use = wq->to_clean = wq->bufs[0];
+
+ return 0;
+}
+
+void vnic_wq_free(struct vnic_wq *wq)
+{
+ struct vnic_dev *vdev;
+ unsigned int i;
+
+ vdev = wq->vdev;
+
+ vnic_dev_free_desc_ring(vdev, &wq->ring);
+
+ for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
+ kfree(wq->bufs[i]);
+ wq->bufs[i] = NULL;
+ }
+
+ wq->ctrl = NULL;
+
+}
+
+int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
+ unsigned int desc_count, unsigned int desc_size)
+{
+ int err;
+
+ wq->index = index;
+ wq->vdev = vdev;
+
+ wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
+ if (!wq->ctrl) {
+ printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
+ return -EINVAL;
+ }
+
+ vnic_wq_disable(wq);
+
+ err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
+ if (err)
+ return err;
+
+ err = vnic_wq_alloc_bufs(wq);
+ if (err) {
+ vnic_wq_free(wq);
+ return err;
+ }
+
+ return 0;
+}
+
+
+int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
+ unsigned int desc_count, unsigned int desc_size)
+{
+ int err;
+
+ wq->index = 0;
+ wq->vdev = vdev;
+
+ err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
+ if (err) {
+ pr_err("Failed to get devcmd2 resource\n");
+ return err;
+ }
+ vnic_wq_disable(wq);
+
+ err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
+ if (err)
+ return err;
+ return 0;
+}
+
+void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
+ unsigned int fetch_index, unsigned int posted_index,
+ unsigned int error_interrupt_enable,
+ unsigned int error_interrupt_offset)
+{
+ u64 paddr;
+ unsigned int count = wq->ring.desc_count;
+
+ paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
+ writeq(paddr, &wq->ctrl->ring_base);
+ iowrite32(count, &wq->ctrl->ring_size);
+ iowrite32(fetch_index, &wq->ctrl->fetch_index);
+ iowrite32(posted_index, &wq->ctrl->posted_index);
+ iowrite32(cq_index, &wq->ctrl->cq_index);
+ iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
+ iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
+ iowrite32(0, &wq->ctrl->error_status);
+
+ wq->to_use = wq->to_clean =
+ &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
+ [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
+}
+
+
+void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
+ unsigned int error_interrupt_enable,
+ unsigned int error_interrupt_offset)
+{
+ u64 paddr;
+
+ paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
+ writeq(paddr, &wq->ctrl->ring_base);
+ iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
+ iowrite32(0, &wq->ctrl->fetch_index);
+ iowrite32(0, &wq->ctrl->posted_index);
+ iowrite32(cq_index, &wq->ctrl->cq_index);
+ iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
+ iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
+ iowrite32(0, &wq->ctrl->error_status);
+}
+
+unsigned int vnic_wq_error_status(struct vnic_wq *wq)
+{
+ return ioread32(&wq->ctrl->error_status);
+}
+
+void vnic_wq_enable(struct vnic_wq *wq)
+{
+ iowrite32(1, &wq->ctrl->enable);
+}
+
+int vnic_wq_disable(struct vnic_wq *wq)
+{
+ unsigned int wait;
+
+ iowrite32(0, &wq->ctrl->enable);
+
+ /* Wait for HW to ACK disable request */
+ for (wait = 0; wait < 100; wait++) {
+ if (!(ioread32(&wq->ctrl->running)))
+ return 0;
+ udelay(1);
+ }
+
+ printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
+
+ return -ETIMEDOUT;
+}
+
+void vnic_wq_clean(struct vnic_wq *wq,
+ void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
+{
+ struct vnic_wq_buf *buf;
+
+ BUG_ON(ioread32(&wq->ctrl->enable));
+
+ buf = wq->to_clean;
+
+ while (vnic_wq_desc_used(wq) > 0) {
+
+ (*buf_clean)(wq, buf);
+
+ buf = wq->to_clean = buf->next;
+ wq->ring.desc_avail++;
+ }
+
+ wq->to_use = wq->to_clean = wq->bufs[0];
+
+ iowrite32(0, &wq->ctrl->fetch_index);
+ iowrite32(0, &wq->ctrl->posted_index);
+ iowrite32(0, &wq->ctrl->error_status);
+
+ vnic_dev_clear_desc_ring(&wq->ring);
+}