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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 | bool mic_psmi_enable = 0; | |
39 | ||
40 | extern struct bin_attribute mic_psmi_ptes_attr; | |
41 | ||
42 | static __always_inline void | |
43 | mic_psmi_free_pte(mic_ctx_t *mic_ctx, int i) | |
44 | { | |
45 | pci_unmap_single(mic_ctx->bi_pdev, | |
46 | mic_ctx->bi_psmi.dma_tbl[i].pa, MIC_PSMI_PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); | |
47 | free_pages(mic_ctx->bi_psmi.va_tbl[i - 1].pa, MIC_PSMI_PAGE_ORDER); | |
48 | } | |
49 | ||
50 | static int mic_psmi_alloc_buffer(mic_ctx_t *mic_ctx) | |
51 | { | |
52 | int i, j, ret; | |
53 | void *va; | |
54 | dma_addr_t dma_hndl; | |
55 | struct mic_psmi_ctx *psmi_ctx = &mic_ctx->bi_psmi; | |
56 | ||
57 | /* allocate psmi page tables */ | |
58 | psmi_ctx->nr_dma_pages = | |
59 | ALIGN(psmi_ctx->dma_mem_size, | |
60 | MIC_PSMI_PAGE_SIZE) / MIC_PSMI_PAGE_SIZE; | |
61 | if ((psmi_ctx->va_tbl = | |
62 | kmalloc(psmi_ctx->nr_dma_pages * | |
63 | sizeof(struct mic_psmi_pte), GFP_KERNEL)) == NULL) { | |
64 | printk("mic: psmi va table alloc failed\n"); | |
65 | return -ENOMEM; | |
66 | } | |
67 | psmi_ctx->dma_tbl_size = | |
68 | (psmi_ctx->nr_dma_pages + 2) * sizeof(struct mic_psmi_pte); | |
69 | if ((psmi_ctx->dma_tbl = | |
70 | kmalloc(psmi_ctx->dma_tbl_size, GFP_KERNEL)) == NULL) { | |
71 | printk("mic: psmi dma table alloc failed\n"); | |
72 | ret = -ENOMEM; | |
73 | goto free_va_tbl; | |
74 | } | |
75 | psmi_ctx->dma_tbl_hndl = | |
76 | pci_map_single(mic_ctx->bi_pdev, | |
77 | psmi_ctx->dma_tbl, psmi_ctx->dma_tbl_size, PCI_DMA_BIDIRECTIONAL); | |
78 | if (pci_dma_mapping_error(mic_ctx->bi_pdev, | |
79 | psmi_ctx->dma_tbl_hndl)) { | |
80 | printk("mic: psmi dma table mapping failed\n"); | |
81 | ret = -ENOMEM; | |
82 | goto free_dma_tbl; | |
83 | } | |
84 | ||
85 | /* allocate psmi pages */ | |
86 | for (i = 0; i < psmi_ctx->nr_dma_pages; i++) { | |
87 | if ((va = (void *)__get_free_pages( | |
88 | GFP_KERNEL | __GFP_HIGHMEM, | |
89 | MIC_PSMI_PAGE_ORDER)) == NULL) { | |
90 | printk("mic: psmi page alloc failed: %d\n", i); | |
91 | ret = -ENOMEM; | |
92 | goto free_ptes; | |
93 | } | |
94 | memset(va, 0, MIC_PSMI_PAGE_SIZE); | |
95 | dma_hndl = pci_map_single(mic_ctx->bi_pdev, va, | |
96 | MIC_PSMI_PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); | |
97 | if (pci_dma_mapping_error(mic_ctx->bi_pdev, dma_hndl)) { | |
98 | printk("mic: psmi page mapping failed: %d\n", i); | |
99 | free_pages((unsigned long)va, MIC_PSMI_PAGE_ORDER); | |
100 | ret = -ENOMEM; | |
101 | goto free_ptes; | |
102 | } | |
103 | psmi_ctx->dma_tbl[i + 1].pa = dma_hndl; | |
104 | psmi_ctx->va_tbl[i].pa = (uint64_t)va; | |
105 | } | |
106 | psmi_ctx->dma_tbl[0].pa = MIC_PSMI_SIGNATURE; | |
107 | psmi_ctx->dma_tbl[psmi_ctx->nr_dma_pages + 1].pa = MIC_PSMI_SIGNATURE; | |
108 | printk("mic: psmi #%d, %ld bytes, " | |
109 | "dma_tbl va=0x%lx hndl=0x%lx\n", mic_ctx->bi_id + 1, | |
110 | (unsigned long)psmi_ctx->dma_mem_size, | |
111 | (unsigned long)psmi_ctx->dma_tbl, | |
112 | (unsigned long)psmi_ctx->dma_tbl_hndl); | |
113 | return 0; | |
114 | free_ptes: | |
115 | for (j = 1; j < i; j++) | |
116 | mic_psmi_free_pte(mic_ctx, j); | |
117 | pci_unmap_single(mic_ctx->bi_pdev, | |
118 | psmi_ctx->dma_tbl_hndl, psmi_ctx->dma_tbl_size, PCI_DMA_BIDIRECTIONAL); | |
119 | free_dma_tbl: | |
120 | kfree(psmi_ctx->dma_tbl); | |
121 | psmi_ctx->dma_tbl = NULL; | |
122 | free_va_tbl: | |
123 | kfree(psmi_ctx->va_tbl); | |
124 | psmi_ctx->va_tbl = NULL; | |
125 | return ret; | |
126 | } | |
127 | ||
128 | static void mic_psmi_free_buffer(mic_ctx_t *mic_ctx) | |
129 | { | |
130 | struct mic_psmi_ctx *psmi_ctx = &mic_ctx->bi_psmi; | |
131 | int i; | |
132 | ||
133 | for (i = 1; i <= psmi_ctx->nr_dma_pages; i++) | |
134 | mic_psmi_free_pte(mic_ctx, i); | |
135 | pci_unmap_single(mic_ctx->bi_pdev, | |
136 | psmi_ctx->dma_tbl_hndl, psmi_ctx->dma_tbl_size, PCI_DMA_BIDIRECTIONAL); | |
137 | kfree(psmi_ctx->dma_tbl); | |
138 | psmi_ctx->dma_tbl = NULL; | |
139 | kfree(psmi_ctx->va_tbl); | |
140 | psmi_ctx->va_tbl = NULL; | |
141 | printk("mic: psmi freed %ld bytes for board #%d\n", | |
142 | (unsigned long)psmi_ctx->dma_mem_size, mic_ctx->bi_id + 1); | |
143 | } | |
144 | ||
145 | extern int usagemode_param; | |
146 | ||
147 | int mic_psmi_init(mic_ctx_t *mic_ctx) | |
148 | { | |
149 | int ret; | |
150 | int status = 0; | |
151 | uint32_t scratch0; | |
152 | struct mic_psmi_ctx * psmi_ctx = &mic_ctx->bi_psmi; | |
153 | ||
154 | psmi_ctx->enabled = 0; | |
155 | /* Only initialize psmi for the first board */ | |
156 | if (!mic_psmi_enable || mic_ctx->bi_id) | |
157 | return 0; | |
158 | if(!(scratch0 = SBOX_READ(mic_ctx->mmio.va, SBOX_SCRATCH0))) { | |
159 | status = wait_for_bootstrap(mic_ctx->mmio.va); | |
160 | scratch0 = SBOX_READ(mic_ctx->mmio.va, SBOX_SCRATCH0); | |
161 | } | |
162 | /* Memory size includes 512K reserved for VGA & GTT table */ | |
163 | psmi_ctx->dma_mem_size = | |
164 | SCRATCH0_MEM_SIZE_KB(scratch0) * ((1) * 1024) + | |
165 | MIC_PSMI_PAGE_SIZE; | |
166 | if (USAGE_MODE_NORMAL == usagemode_param) { | |
167 | if ((ret = mic_psmi_alloc_buffer(mic_ctx))) | |
168 | return ret; | |
169 | mic_psmi_ptes_attr.size = psmi_ctx->dma_tbl_size; | |
170 | } | |
171 | psmi_ctx->enabled = 1; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | void mic_psmi_uninit(mic_ctx_t *mic_ctx) | |
176 | { | |
177 | struct mic_psmi_ctx * psmi_ctx = &mic_ctx->bi_psmi; | |
178 | ||
179 | if (!psmi_ctx->enabled) | |
180 | return; | |
181 | if (USAGE_MODE_NORMAL == usagemode_param) | |
182 | mic_psmi_free_buffer(mic_ctx); | |
183 | psmi_ctx->enabled = 0; | |
184 | } |