1 /*
2  * Copyright (c) 2016 Hisilicon Limited.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 
33 #include <linux/platform_device.h>
34 #include <linux/pci.h>
35 #include <uapi/rdma/hns-abi.h>
36 #include "hns_roce_device.h"
37 
38 static int hns_roce_pd_alloc(struct hns_roce_dev *hr_dev, unsigned long *pdn)
39 {
40 	return hns_roce_bitmap_alloc(&hr_dev->pd_bitmap, pdn) ? -ENOMEM : 0;
41 }
42 
43 static void hns_roce_pd_free(struct hns_roce_dev *hr_dev, unsigned long pdn)
44 {
45 	hns_roce_bitmap_free(&hr_dev->pd_bitmap, pdn, BITMAP_NO_RR);
46 }
47 
48 int hns_roce_init_pd_table(struct hns_roce_dev *hr_dev)
49 {
50 	return hns_roce_bitmap_init(&hr_dev->pd_bitmap, hr_dev->caps.num_pds,
51 				    hr_dev->caps.num_pds - 1,
52 				    hr_dev->caps.reserved_pds, 0);
53 }
54 
55 void hns_roce_cleanup_pd_table(struct hns_roce_dev *hr_dev)
56 {
57 	hns_roce_bitmap_cleanup(&hr_dev->pd_bitmap);
58 }
59 
60 struct ib_pd *hns_roce_alloc_pd(struct ib_device *ib_dev,
61 				struct ib_ucontext *context,
62 				struct ib_udata *udata)
63 {
64 	struct hns_roce_dev *hr_dev = to_hr_dev(ib_dev);
65 	struct device *dev = hr_dev->dev;
66 	struct hns_roce_pd *pd;
67 	int ret;
68 
69 	pd = kmalloc(sizeof(*pd), GFP_KERNEL);
70 	if (!pd)
71 		return ERR_PTR(-ENOMEM);
72 
73 	ret = hns_roce_pd_alloc(to_hr_dev(ib_dev), &pd->pdn);
74 	if (ret) {
75 		kfree(pd);
76 		dev_err(dev, "[alloc_pd]hns_roce_pd_alloc failed!\n");
77 		return ERR_PTR(ret);
78 	}
79 
80 	if (context) {
81 		struct hns_roce_ib_alloc_pd_resp uresp = {.pdn = pd->pdn};
82 
83 		if (ib_copy_to_udata(udata, &uresp, sizeof(uresp))) {
84 			hns_roce_pd_free(to_hr_dev(ib_dev), pd->pdn);
85 			dev_err(dev, "[alloc_pd]ib_copy_to_udata failed!\n");
86 			kfree(pd);
87 			return ERR_PTR(-EFAULT);
88 		}
89 	}
90 
91 	return &pd->ibpd;
92 }
93 EXPORT_SYMBOL_GPL(hns_roce_alloc_pd);
94 
95 int hns_roce_dealloc_pd(struct ib_pd *pd)
96 {
97 	hns_roce_pd_free(to_hr_dev(pd->device), to_hr_pd(pd)->pdn);
98 	kfree(to_hr_pd(pd));
99 
100 	return 0;
101 }
102 EXPORT_SYMBOL_GPL(hns_roce_dealloc_pd);
103 
104 int hns_roce_uar_alloc(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
105 {
106 	struct resource *res;
107 	int ret = 0;
108 
109 	/* Using bitmap to manager UAR index */
110 	ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap, &uar->logic_idx);
111 	if (ret == -1)
112 		return -ENOMEM;
113 
114 	if (uar->logic_idx > 0 && hr_dev->caps.phy_num_uars > 1)
115 		uar->index = (uar->logic_idx - 1) %
116 			     (hr_dev->caps.phy_num_uars - 1) + 1;
117 	else
118 		uar->index = 0;
119 
120 	if (!dev_is_pci(hr_dev->dev)) {
121 		res = platform_get_resource(hr_dev->pdev, IORESOURCE_MEM, 0);
122 		if (!res) {
123 			dev_err(&hr_dev->pdev->dev, "memory resource not found!\n");
124 			return -EINVAL;
125 		}
126 		uar->pfn = ((res->start) >> PAGE_SHIFT) + uar->index;
127 	} else {
128 		uar->pfn = ((pci_resource_start(hr_dev->pci_dev, 2))
129 			   >> PAGE_SHIFT);
130 	}
131 
132 	return 0;
133 }
134 
135 void hns_roce_uar_free(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
136 {
137 	hns_roce_bitmap_free(&hr_dev->uar_table.bitmap, uar->logic_idx,
138 			     BITMAP_NO_RR);
139 }
140 
141 int hns_roce_init_uar_table(struct hns_roce_dev *hr_dev)
142 {
143 	return hns_roce_bitmap_init(&hr_dev->uar_table.bitmap,
144 				    hr_dev->caps.num_uars,
145 				    hr_dev->caps.num_uars - 1,
146 				    hr_dev->caps.reserved_uars, 0);
147 }
148 
149 void hns_roce_cleanup_uar_table(struct hns_roce_dev *hr_dev)
150 {
151 	hns_roce_bitmap_cleanup(&hr_dev->uar_table.bitmap);
152 }
153