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800f879a AT |
1 | /* |
2 | * Copyright 2010-2017 Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * Disclaimer: The codes contained in these modules may be specific to | |
14 | * the Intel Software Development Platform codenamed Knights Ferry, | |
15 | * and the Intel product codenamed Knights Corner, and are not backward | |
16 | * compatible with other Intel products. Additionally, Intel will NOT | |
17 | * support the codes or instruction set in future products. | |
18 | * | |
19 | * Intel offers no warranty of any kind regarding the code. This code is | |
20 | * licensed on an "AS IS" basis and Intel is not obligated to provide | |
21 | * any support, assistance, installation, training, or other services | |
22 | * of any kind. Intel is also not obligated to provide any updates, | |
23 | * enhancements or extensions. Intel specifically disclaims any warranty | |
24 | * of merchantability, non-infringement, fitness for any particular | |
25 | * purpose, and any other warranty. | |
26 | * | |
27 | * Further, Intel disclaims all liability of any kind, including but | |
28 | * not limited to liability for infringement of any proprietary rights, | |
29 | * relating to the use of the code, even if Intel is notified of the | |
30 | * possibility of such liability. Except as expressly stated in an Intel | |
31 | * license agreement provided with this code and agreed upon with Intel, | |
32 | * no license, express or implied, by estoppel or otherwise, to any | |
33 | * intellectual property rights is granted herein. | |
34 | */ | |
35 | ||
36 | #include "micint.h" | |
37 | ||
38 | int mic_psmi_open(struct file *filp) | |
39 | { | |
40 | bd_info_t *bd_info = mic_data.dd_bi[0]; | |
41 | if (!bd_info->bi_ctx.bi_psmi.enabled) | |
42 | return -EINVAL; | |
43 | ((filp)->private_data) = &bd_info->bi_ctx; | |
44 | return 0; | |
45 | } | |
46 | ||
47 | extern int usagemode_param; | |
48 | ||
49 | ssize_t mic_psmi_read(struct file * filp, char __user *buf, | |
50 | size_t count, loff_t *pos) | |
51 | { | |
52 | ssize_t total_bytes = 0; | |
53 | unsigned int pg_no, pg_off, bytes; | |
54 | mic_ctx_t *mic_ctx = ((filp)->private_data); | |
55 | struct mic_psmi_ctx *psmi_ctx = &mic_ctx->bi_psmi; | |
56 | loff_t mem_size; | |
57 | ||
58 | if (!psmi_ctx->enabled) | |
59 | return -EINVAL; | |
60 | if (FAMILY_ABR == mic_ctx->bi_family && | |
61 | USAGE_MODE_NORMAL != usagemode_param) | |
62 | mem_size = MIC_APERTURE_SIZE; | |
63 | else | |
64 | mem_size = psmi_ctx->dma_mem_size; | |
65 | if (*pos >= mem_size || count <= 0) | |
66 | return 0; | |
67 | if (*pos + count > mem_size) | |
68 | count = mem_size - *pos; | |
69 | /* read aperture memory */ | |
70 | if (USAGE_MODE_NORMAL != usagemode_param) { | |
71 | if (copy_to_user(buf, | |
72 | mic_ctx->aper.va + *pos, count)) | |
73 | return -EFAULT; | |
74 | goto read_exit; | |
75 | } | |
76 | /* read host memory allocated for psmi handler */ | |
77 | pg_no = *pos / MIC_PSMI_PAGE_SIZE; | |
78 | pg_off = *pos % MIC_PSMI_PAGE_SIZE; | |
79 | while (total_bytes < count) { | |
80 | pci_dma_sync_single_for_cpu(mic_ctx->bi_pdev, | |
81 | psmi_ctx->dma_tbl[pg_no + 1].pa, | |
82 | MIC_PSMI_PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); | |
83 | bytes = MIC_PSMI_PAGE_SIZE - pg_off; | |
84 | if (total_bytes + bytes > count) | |
85 | bytes = count - total_bytes; | |
86 | if (copy_to_user(buf, | |
87 | (void *)psmi_ctx->va_tbl[pg_no].pa + pg_off, bytes)) | |
88 | return -EFAULT; | |
89 | total_bytes += bytes; | |
90 | buf += bytes; | |
91 | pg_no++; | |
92 | /* Only the first page needs an offset */ | |
93 | pg_off = 0; | |
94 | } | |
95 | read_exit: | |
96 | *pos += count; | |
97 | return count; | |
98 | } | |
99 | ||
100 | static ssize_t show_mem_size(struct device *dev, | |
101 | struct device_attribute *attr, char *buf) | |
102 | { | |
103 | mic_ctx_t *mic_ctx = dev_get_drvdata(dev); | |
104 | struct mic_psmi_ctx *psmi_ctx = &mic_ctx->bi_psmi; | |
105 | ||
106 | return snprintf(buf, PAGE_SIZE, "%ld\n", | |
107 | (unsigned long)psmi_ctx->dma_mem_size); | |
108 | } | |
109 | static DEVICE_ATTR(mem_size, S_IRUGO, show_mem_size, NULL); | |
110 | ||
111 | static struct attribute *psmi_attributes[] = { | |
112 | &dev_attr_mem_size.attr, | |
113 | NULL | |
114 | }; | |
115 | ||
116 | struct attribute_group psmi_attr_group = { | |
117 | .attrs = psmi_attributes | |
118 | }; | |
119 | ||
120 | #if (defined(RHEL_RELEASE_CODE) && \ | |
121 | (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,32))) || \ | |
122 | LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) | |
123 | static ssize_t mic_psmi_read_ptes(struct file *filp, struct kobject *kobj, | |
124 | struct bin_attribute *attr, char *buf, loff_t pos, size_t size) | |
125 | #else | |
126 | static ssize_t mic_psmi_read_ptes(struct kobject *kobj, | |
127 | struct bin_attribute *attr, char *buf, loff_t pos, size_t size) | |
128 | #endif | |
129 | { | |
130 | struct device *dev = container_of(kobj, struct device, kobj); | |
131 | struct mic_psmi_ctx *psmi_ctx = | |
132 | &((mic_ctx_t *)dev_get_drvdata(dev))->bi_psmi; | |
133 | ||
134 | if (pos >= psmi_ctx->dma_tbl_size || size <= 0) | |
135 | return 0; | |
136 | if (pos + size > psmi_ctx->dma_tbl_size) | |
137 | size = psmi_ctx->dma_tbl_size - pos; | |
138 | memcpy(buf, psmi_ctx->dma_tbl, size); | |
139 | return size; | |
140 | } | |
141 | ||
142 | struct bin_attribute mic_psmi_ptes_attr = { | |
143 | .attr = { | |
144 | .name = "psmi_ptes", | |
145 | .mode = S_IRUSR | |
146 | }, | |
147 | .read = mic_psmi_read_ptes | |
148 | }; | |
149 | ||
150 | extern bool mic_psmi_enable; | |
151 | module_param_named(psmi, mic_psmi_enable, bool, S_IRUSR); | |
152 | MODULE_PARM_DESC(psmi, "Enable/disable mic psmi"); |