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f204e0b8 IM |
1 | /* |
2 | * Copyright 2014 IBM Corp. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/spinlock.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/idr.h> | |
21 | #include <linux/pci.h> | |
22 | #include <asm/cputable.h> | |
23 | #include <misc/cxl.h> | |
24 | ||
25 | #include "cxl.h" | |
26 | ||
27 | static DEFINE_SPINLOCK(adapter_idr_lock); | |
28 | static DEFINE_IDR(cxl_adapter_idr); | |
29 | ||
30 | uint cxl_verbose; | |
31 | module_param_named(verbose, cxl_verbose, uint, 0600); | |
32 | MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); | |
33 | ||
34 | static inline void _cxl_slbia(struct cxl_context *ctx, struct mm_struct *mm) | |
35 | { | |
36 | struct task_struct *task; | |
37 | unsigned long flags; | |
38 | if (!(task = get_pid_task(ctx->pid, PIDTYPE_PID))) { | |
39 | pr_devel("%s unable to get task %i\n", | |
40 | __func__, pid_nr(ctx->pid)); | |
41 | return; | |
42 | } | |
43 | ||
44 | if (task->mm != mm) | |
45 | goto out_put; | |
46 | ||
47 | pr_devel("%s matched mm - card: %i afu: %i pe: %i\n", __func__, | |
48 | ctx->afu->adapter->adapter_num, ctx->afu->slice, ctx->pe); | |
49 | ||
50 | spin_lock_irqsave(&ctx->sste_lock, flags); | |
51 | memset(ctx->sstp, 0, ctx->sst_size); | |
52 | spin_unlock_irqrestore(&ctx->sste_lock, flags); | |
53 | mb(); | |
54 | cxl_afu_slbia(ctx->afu); | |
55 | out_put: | |
56 | put_task_struct(task); | |
57 | } | |
58 | ||
59 | static inline void cxl_slbia_core(struct mm_struct *mm) | |
60 | { | |
61 | struct cxl *adapter; | |
62 | struct cxl_afu *afu; | |
63 | struct cxl_context *ctx; | |
64 | int card, slice, id; | |
65 | ||
66 | pr_devel("%s called\n", __func__); | |
67 | ||
68 | spin_lock(&adapter_idr_lock); | |
69 | idr_for_each_entry(&cxl_adapter_idr, adapter, card) { | |
70 | /* XXX: Make this lookup faster with link from mm to ctx */ | |
71 | spin_lock(&adapter->afu_list_lock); | |
72 | for (slice = 0; slice < adapter->slices; slice++) { | |
73 | afu = adapter->afu[slice]; | |
74 | if (!afu->enabled) | |
75 | continue; | |
76 | rcu_read_lock(); | |
77 | idr_for_each_entry(&afu->contexts_idr, ctx, id) | |
78 | _cxl_slbia(ctx, mm); | |
79 | rcu_read_unlock(); | |
80 | } | |
81 | spin_unlock(&adapter->afu_list_lock); | |
82 | } | |
83 | spin_unlock(&adapter_idr_lock); | |
84 | } | |
85 | ||
86 | static struct cxl_calls cxl_calls = { | |
87 | .cxl_slbia = cxl_slbia_core, | |
88 | .owner = THIS_MODULE, | |
89 | }; | |
90 | ||
91 | int cxl_alloc_sst(struct cxl_context *ctx) | |
92 | { | |
93 | unsigned long vsid; | |
94 | u64 ea_mask, size, sstp0, sstp1; | |
95 | ||
96 | sstp0 = 0; | |
97 | sstp1 = 0; | |
98 | ||
99 | ctx->sst_size = PAGE_SIZE; | |
100 | ctx->sst_lru = 0; | |
101 | ctx->sstp = (struct cxl_sste *)get_zeroed_page(GFP_KERNEL); | |
102 | if (!ctx->sstp) { | |
103 | pr_err("cxl_alloc_sst: Unable to allocate segment table\n"); | |
104 | return -ENOMEM; | |
105 | } | |
106 | pr_devel("SSTP allocated at 0x%p\n", ctx->sstp); | |
107 | ||
108 | vsid = get_kernel_vsid((u64)ctx->sstp, mmu_kernel_ssize) << 12; | |
109 | ||
110 | sstp0 |= (u64)mmu_kernel_ssize << CXL_SSTP0_An_B_SHIFT; | |
111 | sstp0 |= (SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp) << 50; | |
112 | ||
113 | size = (((u64)ctx->sst_size >> 8) - 1) << CXL_SSTP0_An_SegTableSize_SHIFT; | |
114 | if (unlikely(size & ~CXL_SSTP0_An_SegTableSize_MASK)) { | |
115 | WARN(1, "Impossible segment table size\n"); | |
116 | return -EINVAL; | |
117 | } | |
118 | sstp0 |= size; | |
119 | ||
120 | if (mmu_kernel_ssize == MMU_SEGSIZE_256M) | |
121 | ea_mask = 0xfffff00ULL; | |
122 | else | |
123 | ea_mask = 0xffffffff00ULL; | |
124 | ||
125 | sstp0 |= vsid >> (50-14); /* Top 14 bits of VSID */ | |
126 | sstp1 |= (vsid << (64-(50-14))) & ~ea_mask; | |
127 | sstp1 |= (u64)ctx->sstp & ea_mask; | |
128 | sstp1 |= CXL_SSTP1_An_V; | |
129 | ||
130 | pr_devel("Looked up %#llx: slbfee. %#llx (ssize: %x, vsid: %#lx), copied to SSTP0: %#llx, SSTP1: %#llx\n", | |
131 | (u64)ctx->sstp, (u64)ctx->sstp & ESID_MASK, mmu_kernel_ssize, vsid, sstp0, sstp1); | |
132 | ||
133 | /* Store calculated sstp hardware points for use later */ | |
134 | ctx->sstp0 = sstp0; | |
135 | ctx->sstp1 = sstp1; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | /* Find a CXL adapter by it's number and increase it's refcount */ | |
141 | struct cxl *get_cxl_adapter(int num) | |
142 | { | |
143 | struct cxl *adapter; | |
144 | ||
145 | spin_lock(&adapter_idr_lock); | |
146 | if ((adapter = idr_find(&cxl_adapter_idr, num))) | |
147 | get_device(&adapter->dev); | |
148 | spin_unlock(&adapter_idr_lock); | |
149 | ||
150 | return adapter; | |
151 | } | |
152 | ||
153 | int cxl_alloc_adapter_nr(struct cxl *adapter) | |
154 | { | |
155 | int i; | |
156 | ||
157 | idr_preload(GFP_KERNEL); | |
158 | spin_lock(&adapter_idr_lock); | |
159 | i = idr_alloc(&cxl_adapter_idr, adapter, 0, 0, GFP_NOWAIT); | |
160 | spin_unlock(&adapter_idr_lock); | |
161 | idr_preload_end(); | |
162 | if (i < 0) | |
163 | return i; | |
164 | ||
165 | adapter->adapter_num = i; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | void cxl_remove_adapter_nr(struct cxl *adapter) | |
171 | { | |
172 | idr_remove(&cxl_adapter_idr, adapter->adapter_num); | |
173 | } | |
174 | ||
175 | int cxl_afu_select_best_mode(struct cxl_afu *afu) | |
176 | { | |
177 | if (afu->modes_supported & CXL_MODE_DIRECTED) | |
178 | return cxl_afu_activate_mode(afu, CXL_MODE_DIRECTED); | |
179 | ||
180 | if (afu->modes_supported & CXL_MODE_DEDICATED) | |
181 | return cxl_afu_activate_mode(afu, CXL_MODE_DEDICATED); | |
182 | ||
183 | dev_warn(&afu->dev, "No supported programming modes available\n"); | |
184 | /* We don't fail this so the user can inspect sysfs */ | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int __init init_cxl(void) | |
189 | { | |
190 | int rc = 0; | |
191 | ||
192 | if (!cpu_has_feature(CPU_FTR_HVMODE)) | |
193 | return -EPERM; | |
194 | ||
195 | if ((rc = cxl_file_init())) | |
196 | return rc; | |
197 | ||
198 | cxl_debugfs_init(); | |
199 | ||
200 | if ((rc = register_cxl_calls(&cxl_calls))) | |
201 | goto err; | |
202 | ||
203 | if ((rc = pci_register_driver(&cxl_pci_driver))) | |
204 | goto err1; | |
205 | ||
206 | return 0; | |
207 | err1: | |
208 | unregister_cxl_calls(&cxl_calls); | |
209 | err: | |
210 | cxl_debugfs_exit(); | |
211 | cxl_file_exit(); | |
212 | ||
213 | return rc; | |
214 | } | |
215 | ||
216 | static void exit_cxl(void) | |
217 | { | |
218 | pci_unregister_driver(&cxl_pci_driver); | |
219 | ||
220 | cxl_debugfs_exit(); | |
221 | cxl_file_exit(); | |
222 | unregister_cxl_calls(&cxl_calls); | |
223 | } | |
224 | ||
225 | module_init(init_cxl); | |
226 | module_exit(exit_cxl); | |
227 | ||
228 | MODULE_DESCRIPTION("IBM Coherent Accelerator"); | |
229 | MODULE_AUTHOR("Ian Munsie <imunsie@au1.ibm.com>"); | |
230 | MODULE_LICENSE("GPL"); |