diff options
author | Takashi Iwai <tiwai@suse.de> | 2009-05-29 05:46:10 -0400 |
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committer | Takashi Iwai <tiwai@suse.de> | 2009-05-29 05:46:10 -0400 |
commit | e93721a70263afefbac781f575bfe851c6f95d84 (patch) | |
tree | ab359f12a0688802aa99339bae82c51763dae9f6 /drivers/scsi/fnic/vnic_wq.c | |
parent | ae1ec5e1e97f67d41e641a73380129e5905e41cc (diff) | |
parent | c87d9732004b3f8fd82d729f12ccfb96c0df279e (diff) |
Merge branch 'fix/pcm-jiffies-check' into topic/pcm-jiffies-check
Diffstat (limited to 'drivers/scsi/fnic/vnic_wq.c')
-rw-r--r-- | drivers/scsi/fnic/vnic_wq.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/scsi/fnic/vnic_wq.c b/drivers/scsi/fnic/vnic_wq.c new file mode 100644 index 000000000000..1f9ea790d130 --- /dev/null +++ b/drivers/scsi/fnic/vnic_wq.c | |||
@@ -0,0 +1,182 @@ | |||
1 | /* | ||
2 | * Copyright 2008 Cisco Systems, Inc. All rights reserved. | ||
3 | * Copyright 2007 Nuova Systems, Inc. All rights reserved. | ||
4 | * | ||
5 | * This program is free software; you may redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License as published by | ||
7 | * the Free Software Foundation; version 2 of the License. | ||
8 | * | ||
9 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
10 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
11 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
12 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | ||
13 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | ||
14 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
15 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
16 | * SOFTWARE. | ||
17 | */ | ||
18 | |||
19 | #include <linux/errno.h> | ||
20 | #include <linux/types.h> | ||
21 | #include <linux/pci.h> | ||
22 | #include <linux/delay.h> | ||
23 | #include "vnic_dev.h" | ||
24 | #include "vnic_wq.h" | ||
25 | |||
26 | static int vnic_wq_alloc_bufs(struct vnic_wq *wq) | ||
27 | { | ||
28 | struct vnic_wq_buf *buf; | ||
29 | struct vnic_dev *vdev; | ||
30 | unsigned int i, j, count = wq->ring.desc_count; | ||
31 | unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); | ||
32 | |||
33 | vdev = wq->vdev; | ||
34 | |||
35 | for (i = 0; i < blks; i++) { | ||
36 | wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); | ||
37 | if (!wq->bufs[i]) { | ||
38 | printk(KERN_ERR "Failed to alloc wq_bufs\n"); | ||
39 | return -ENOMEM; | ||
40 | } | ||
41 | } | ||
42 | |||
43 | for (i = 0; i < blks; i++) { | ||
44 | buf = wq->bufs[i]; | ||
45 | for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) { | ||
46 | buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j; | ||
47 | buf->desc = (u8 *)wq->ring.descs + | ||
48 | wq->ring.desc_size * buf->index; | ||
49 | if (buf->index + 1 == count) { | ||
50 | buf->next = wq->bufs[0]; | ||
51 | break; | ||
52 | } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) { | ||
53 | buf->next = wq->bufs[i + 1]; | ||
54 | } else { | ||
55 | buf->next = buf + 1; | ||
56 | buf++; | ||
57 | } | ||
58 | } | ||
59 | } | ||
60 | |||
61 | wq->to_use = wq->to_clean = wq->bufs[0]; | ||
62 | |||
63 | return 0; | ||
64 | } | ||
65 | |||
66 | void vnic_wq_free(struct vnic_wq *wq) | ||
67 | { | ||
68 | struct vnic_dev *vdev; | ||
69 | unsigned int i; | ||
70 | |||
71 | vdev = wq->vdev; | ||
72 | |||
73 | vnic_dev_free_desc_ring(vdev, &wq->ring); | ||
74 | |||
75 | for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { | ||
76 | kfree(wq->bufs[i]); | ||
77 | wq->bufs[i] = NULL; | ||
78 | } | ||
79 | |||
80 | wq->ctrl = NULL; | ||
81 | |||
82 | } | ||
83 | |||
84 | int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, | ||
85 | unsigned int desc_count, unsigned int desc_size) | ||
86 | { | ||
87 | int err; | ||
88 | |||
89 | wq->index = index; | ||
90 | wq->vdev = vdev; | ||
91 | |||
92 | wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); | ||
93 | if (!wq->ctrl) { | ||
94 | printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index); | ||
95 | return -EINVAL; | ||
96 | } | ||
97 | |||
98 | vnic_wq_disable(wq); | ||
99 | |||
100 | err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); | ||
101 | if (err) | ||
102 | return err; | ||
103 | |||
104 | err = vnic_wq_alloc_bufs(wq); | ||
105 | if (err) { | ||
106 | vnic_wq_free(wq); | ||
107 | return err; | ||
108 | } | ||
109 | |||
110 | return 0; | ||
111 | } | ||
112 | |||
113 | void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, | ||
114 | unsigned int error_interrupt_enable, | ||
115 | unsigned int error_interrupt_offset) | ||
116 | { | ||
117 | u64 paddr; | ||
118 | |||
119 | paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; | ||
120 | writeq(paddr, &wq->ctrl->ring_base); | ||
121 | iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size); | ||
122 | iowrite32(0, &wq->ctrl->fetch_index); | ||
123 | iowrite32(0, &wq->ctrl->posted_index); | ||
124 | iowrite32(cq_index, &wq->ctrl->cq_index); | ||
125 | iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); | ||
126 | iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); | ||
127 | iowrite32(0, &wq->ctrl->error_status); | ||
128 | } | ||
129 | |||
130 | unsigned int vnic_wq_error_status(struct vnic_wq *wq) | ||
131 | { | ||
132 | return ioread32(&wq->ctrl->error_status); | ||
133 | } | ||
134 | |||
135 | void vnic_wq_enable(struct vnic_wq *wq) | ||
136 | { | ||
137 | iowrite32(1, &wq->ctrl->enable); | ||
138 | } | ||
139 | |||
140 | int vnic_wq_disable(struct vnic_wq *wq) | ||
141 | { | ||
142 | unsigned int wait; | ||
143 | |||
144 | iowrite32(0, &wq->ctrl->enable); | ||
145 | |||
146 | /* Wait for HW to ACK disable request */ | ||
147 | for (wait = 0; wait < 100; wait++) { | ||
148 | if (!(ioread32(&wq->ctrl->running))) | ||
149 | return 0; | ||
150 | udelay(1); | ||
151 | } | ||
152 | |||
153 | printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index); | ||
154 | |||
155 | return -ETIMEDOUT; | ||
156 | } | ||
157 | |||
158 | void vnic_wq_clean(struct vnic_wq *wq, | ||
159 | void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) | ||
160 | { | ||
161 | struct vnic_wq_buf *buf; | ||
162 | |||
163 | BUG_ON(ioread32(&wq->ctrl->enable)); | ||
164 | |||
165 | buf = wq->to_clean; | ||
166 | |||
167 | while (vnic_wq_desc_used(wq) > 0) { | ||
168 | |||
169 | (*buf_clean)(wq, buf); | ||
170 | |||
171 | buf = wq->to_clean = buf->next; | ||
172 | wq->ring.desc_avail++; | ||
173 | } | ||
174 | |||
175 | wq->to_use = wq->to_clean = wq->bufs[0]; | ||
176 | |||
177 | iowrite32(0, &wq->ctrl->fetch_index); | ||
178 | iowrite32(0, &wq->ctrl->posted_index); | ||
179 | iowrite32(0, &wq->ctrl->error_status); | ||
180 | |||
181 | vnic_dev_clear_desc_ring(&wq->ring); | ||
182 | } | ||