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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> | |
ec249dd8 | 23 | #include <misc/cxl-base.h> |
f204e0b8 IM |
24 | |
25 | #include "cxl.h" | |
9bcf28cd | 26 | #include "trace.h" |
f204e0b8 IM |
27 | |
28 | static DEFINE_SPINLOCK(adapter_idr_lock); | |
29 | static DEFINE_IDR(cxl_adapter_idr); | |
30 | ||
31 | uint cxl_verbose; | |
32 | module_param_named(verbose, cxl_verbose, uint, 0600); | |
33 | MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); | |
34 | ||
35 | static inline void _cxl_slbia(struct cxl_context *ctx, struct mm_struct *mm) | |
36 | { | |
37 | struct task_struct *task; | |
38 | unsigned long flags; | |
39 | if (!(task = get_pid_task(ctx->pid, PIDTYPE_PID))) { | |
40 | pr_devel("%s unable to get task %i\n", | |
41 | __func__, pid_nr(ctx->pid)); | |
42 | return; | |
43 | } | |
44 | ||
45 | if (task->mm != mm) | |
46 | goto out_put; | |
47 | ||
48 | pr_devel("%s matched mm - card: %i afu: %i pe: %i\n", __func__, | |
49 | ctx->afu->adapter->adapter_num, ctx->afu->slice, ctx->pe); | |
50 | ||
51 | spin_lock_irqsave(&ctx->sste_lock, flags); | |
9bcf28cd | 52 | trace_cxl_slbia(ctx); |
f204e0b8 IM |
53 | memset(ctx->sstp, 0, ctx->sst_size); |
54 | spin_unlock_irqrestore(&ctx->sste_lock, flags); | |
55 | mb(); | |
56 | cxl_afu_slbia(ctx->afu); | |
57 | out_put: | |
58 | put_task_struct(task); | |
59 | } | |
60 | ||
61 | static inline void cxl_slbia_core(struct mm_struct *mm) | |
62 | { | |
63 | struct cxl *adapter; | |
64 | struct cxl_afu *afu; | |
65 | struct cxl_context *ctx; | |
66 | int card, slice, id; | |
67 | ||
68 | pr_devel("%s called\n", __func__); | |
69 | ||
70 | spin_lock(&adapter_idr_lock); | |
71 | idr_for_each_entry(&cxl_adapter_idr, adapter, card) { | |
72 | /* XXX: Make this lookup faster with link from mm to ctx */ | |
73 | spin_lock(&adapter->afu_list_lock); | |
74 | for (slice = 0; slice < adapter->slices; slice++) { | |
75 | afu = adapter->afu[slice]; | |
76 | if (!afu->enabled) | |
77 | continue; | |
78 | rcu_read_lock(); | |
79 | idr_for_each_entry(&afu->contexts_idr, ctx, id) | |
80 | _cxl_slbia(ctx, mm); | |
81 | rcu_read_unlock(); | |
82 | } | |
83 | spin_unlock(&adapter->afu_list_lock); | |
84 | } | |
85 | spin_unlock(&adapter_idr_lock); | |
86 | } | |
87 | ||
88 | static struct cxl_calls cxl_calls = { | |
89 | .cxl_slbia = cxl_slbia_core, | |
90 | .owner = THIS_MODULE, | |
91 | }; | |
92 | ||
93 | int cxl_alloc_sst(struct cxl_context *ctx) | |
94 | { | |
95 | unsigned long vsid; | |
96 | u64 ea_mask, size, sstp0, sstp1; | |
97 | ||
98 | sstp0 = 0; | |
99 | sstp1 = 0; | |
100 | ||
101 | ctx->sst_size = PAGE_SIZE; | |
102 | ctx->sst_lru = 0; | |
103 | ctx->sstp = (struct cxl_sste *)get_zeroed_page(GFP_KERNEL); | |
104 | if (!ctx->sstp) { | |
105 | pr_err("cxl_alloc_sst: Unable to allocate segment table\n"); | |
106 | return -ENOMEM; | |
107 | } | |
108 | pr_devel("SSTP allocated at 0x%p\n", ctx->sstp); | |
109 | ||
110 | vsid = get_kernel_vsid((u64)ctx->sstp, mmu_kernel_ssize) << 12; | |
111 | ||
112 | sstp0 |= (u64)mmu_kernel_ssize << CXL_SSTP0_An_B_SHIFT; | |
113 | sstp0 |= (SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp) << 50; | |
114 | ||
115 | size = (((u64)ctx->sst_size >> 8) - 1) << CXL_SSTP0_An_SegTableSize_SHIFT; | |
116 | if (unlikely(size & ~CXL_SSTP0_An_SegTableSize_MASK)) { | |
117 | WARN(1, "Impossible segment table size\n"); | |
118 | return -EINVAL; | |
119 | } | |
120 | sstp0 |= size; | |
121 | ||
122 | if (mmu_kernel_ssize == MMU_SEGSIZE_256M) | |
123 | ea_mask = 0xfffff00ULL; | |
124 | else | |
125 | ea_mask = 0xffffffff00ULL; | |
126 | ||
127 | sstp0 |= vsid >> (50-14); /* Top 14 bits of VSID */ | |
128 | sstp1 |= (vsid << (64-(50-14))) & ~ea_mask; | |
129 | sstp1 |= (u64)ctx->sstp & ea_mask; | |
130 | sstp1 |= CXL_SSTP1_An_V; | |
131 | ||
132 | pr_devel("Looked up %#llx: slbfee. %#llx (ssize: %x, vsid: %#lx), copied to SSTP0: %#llx, SSTP1: %#llx\n", | |
133 | (u64)ctx->sstp, (u64)ctx->sstp & ESID_MASK, mmu_kernel_ssize, vsid, sstp0, sstp1); | |
134 | ||
135 | /* Store calculated sstp hardware points for use later */ | |
136 | ctx->sstp0 = sstp0; | |
137 | ctx->sstp1 = sstp1; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | /* Find a CXL adapter by it's number and increase it's refcount */ | |
143 | struct cxl *get_cxl_adapter(int num) | |
144 | { | |
145 | struct cxl *adapter; | |
146 | ||
147 | spin_lock(&adapter_idr_lock); | |
148 | if ((adapter = idr_find(&cxl_adapter_idr, num))) | |
149 | get_device(&adapter->dev); | |
150 | spin_unlock(&adapter_idr_lock); | |
151 | ||
152 | return adapter; | |
153 | } | |
154 | ||
155 | int cxl_alloc_adapter_nr(struct cxl *adapter) | |
156 | { | |
157 | int i; | |
158 | ||
159 | idr_preload(GFP_KERNEL); | |
160 | spin_lock(&adapter_idr_lock); | |
161 | i = idr_alloc(&cxl_adapter_idr, adapter, 0, 0, GFP_NOWAIT); | |
162 | spin_unlock(&adapter_idr_lock); | |
163 | idr_preload_end(); | |
164 | if (i < 0) | |
165 | return i; | |
166 | ||
167 | adapter->adapter_num = i; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | void cxl_remove_adapter_nr(struct cxl *adapter) | |
173 | { | |
174 | idr_remove(&cxl_adapter_idr, adapter->adapter_num); | |
175 | } | |
176 | ||
177 | int cxl_afu_select_best_mode(struct cxl_afu *afu) | |
178 | { | |
179 | if (afu->modes_supported & CXL_MODE_DIRECTED) | |
180 | return cxl_afu_activate_mode(afu, CXL_MODE_DIRECTED); | |
181 | ||
182 | if (afu->modes_supported & CXL_MODE_DEDICATED) | |
183 | return cxl_afu_activate_mode(afu, CXL_MODE_DEDICATED); | |
184 | ||
185 | dev_warn(&afu->dev, "No supported programming modes available\n"); | |
186 | /* We don't fail this so the user can inspect sysfs */ | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static int __init init_cxl(void) | |
191 | { | |
192 | int rc = 0; | |
193 | ||
194 | if (!cpu_has_feature(CPU_FTR_HVMODE)) | |
195 | return -EPERM; | |
196 | ||
197 | if ((rc = cxl_file_init())) | |
198 | return rc; | |
199 | ||
200 | cxl_debugfs_init(); | |
201 | ||
202 | if ((rc = register_cxl_calls(&cxl_calls))) | |
203 | goto err; | |
204 | ||
205 | if ((rc = pci_register_driver(&cxl_pci_driver))) | |
206 | goto err1; | |
207 | ||
208 | return 0; | |
209 | err1: | |
210 | unregister_cxl_calls(&cxl_calls); | |
211 | err: | |
212 | cxl_debugfs_exit(); | |
213 | cxl_file_exit(); | |
214 | ||
215 | return rc; | |
216 | } | |
217 | ||
218 | static void exit_cxl(void) | |
219 | { | |
220 | pci_unregister_driver(&cxl_pci_driver); | |
221 | ||
222 | cxl_debugfs_exit(); | |
223 | cxl_file_exit(); | |
224 | unregister_cxl_calls(&cxl_calls); | |
225 | } | |
226 | ||
227 | module_init(init_cxl); | |
228 | module_exit(exit_cxl); | |
229 | ||
230 | MODULE_DESCRIPTION("IBM Coherent Accelerator"); | |
231 | MODULE_AUTHOR("Ian Munsie <imunsie@au1.ibm.com>"); | |
232 | MODULE_LICENSE("GPL"); |