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22#include <linux/list.h>
23#include <linux/pci.h>
24#include <linux/rbtree.h>
25#include <linux/slab.h>
26#include <linux/spinlock.h>
27#include <linux/atomic.h>
28#include <asm/pci-bridge.h>
29#include <asm/ppc-pci.h>
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49struct pci_io_addr_range {
50 struct rb_node rb_node;
51 resource_size_t addr_lo;
52 resource_size_t addr_hi;
53 struct eeh_dev *edev;
54 struct pci_dev *pcidev;
55 unsigned long flags;
56};
57
58static struct pci_io_addr_cache {
59 struct rb_root rb_root;
60 spinlock_t piar_lock;
61} pci_io_addr_cache_root;
62
63static inline struct eeh_dev *__eeh_addr_cache_get_device(unsigned long addr)
64{
65 struct rb_node *n = pci_io_addr_cache_root.rb_root.rb_node;
66
67 while (n) {
68 struct pci_io_addr_range *piar;
69 piar = rb_entry(n, struct pci_io_addr_range, rb_node);
70
71 if (addr < piar->addr_lo)
72 n = n->rb_left;
73 else if (addr > piar->addr_hi)
74 n = n->rb_right;
75 else
76 return piar->edev;
77 }
78
79 return NULL;
80}
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90
91struct eeh_dev *eeh_addr_cache_get_dev(unsigned long addr)
92{
93 struct eeh_dev *edev;
94 unsigned long flags;
95
96 spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
97 edev = __eeh_addr_cache_get_device(addr);
98 spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
99 return edev;
100}
101
102#ifdef DEBUG
103
104
105
106
107static void eeh_addr_cache_print(struct pci_io_addr_cache *cache)
108{
109 struct rb_node *n;
110 int cnt = 0;
111
112 n = rb_first(&cache->rb_root);
113 while (n) {
114 struct pci_io_addr_range *piar;
115 piar = rb_entry(n, struct pci_io_addr_range, rb_node);
116 pr_debug("PCI: %s addr range %d [%pap-%pap]: %s\n",
117 (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt,
118 &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev));
119 cnt++;
120 n = rb_next(n);
121 }
122}
123#endif
124
125
126static struct pci_io_addr_range *
127eeh_addr_cache_insert(struct pci_dev *dev, resource_size_t alo,
128 resource_size_t ahi, unsigned long flags)
129{
130 struct rb_node **p = &pci_io_addr_cache_root.rb_root.rb_node;
131 struct rb_node *parent = NULL;
132 struct pci_io_addr_range *piar;
133
134
135 while (*p) {
136 parent = *p;
137 piar = rb_entry(parent, struct pci_io_addr_range, rb_node);
138 if (ahi < piar->addr_lo) {
139 p = &parent->rb_left;
140 } else if (alo > piar->addr_hi) {
141 p = &parent->rb_right;
142 } else {
143 if (dev != piar->pcidev ||
144 alo != piar->addr_lo || ahi != piar->addr_hi) {
145 pr_warn("PIAR: overlapping address range\n");
146 }
147 return piar;
148 }
149 }
150 piar = kzalloc(sizeof(struct pci_io_addr_range), GFP_ATOMIC);
151 if (!piar)
152 return NULL;
153
154 piar->addr_lo = alo;
155 piar->addr_hi = ahi;
156 piar->edev = pci_dev_to_eeh_dev(dev);
157 piar->pcidev = dev;
158 piar->flags = flags;
159
160#ifdef DEBUG
161 pr_debug("PIAR: insert range=[%pap:%pap] dev=%s\n",
162 &alo, &ahi, pci_name(dev));
163#endif
164
165 rb_link_node(&piar->rb_node, parent, p);
166 rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root);
167
168 return piar;
169}
170
171static void __eeh_addr_cache_insert_dev(struct pci_dev *dev)
172{
173 struct pci_dn *pdn;
174 struct eeh_dev *edev;
175 int i;
176
177 pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn);
178 if (!pdn) {
179 pr_warn("PCI: no pci dn found for dev=%s\n",
180 pci_name(dev));
181 return;
182 }
183
184 edev = pdn_to_eeh_dev(pdn);
185 if (!edev) {
186 pr_warn("PCI: no EEH dev found for %s\n",
187 pci_name(dev));
188 return;
189 }
190
191
192 if (!edev->pe) {
193 dev_dbg(&dev->dev, "EEH: Skip building address cache\n");
194 return;
195 }
196
197
198
199
200
201 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
202 resource_size_t start = pci_resource_start(dev,i);
203 resource_size_t end = pci_resource_end(dev,i);
204 unsigned long flags = pci_resource_flags(dev,i);
205
206
207 if (0 == (flags & (IORESOURCE_IO | IORESOURCE_MEM)))
208 continue;
209 if (start == 0 || ~start == 0 || end == 0 || ~end == 0)
210 continue;
211 eeh_addr_cache_insert(dev, start, end, flags);
212 }
213}
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221
222
223void eeh_addr_cache_insert_dev(struct pci_dev *dev)
224{
225 unsigned long flags;
226
227 spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
228 __eeh_addr_cache_insert_dev(dev);
229 spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
230}
231
232static inline void __eeh_addr_cache_rmv_dev(struct pci_dev *dev)
233{
234 struct rb_node *n;
235
236restart:
237 n = rb_first(&pci_io_addr_cache_root.rb_root);
238 while (n) {
239 struct pci_io_addr_range *piar;
240 piar = rb_entry(n, struct pci_io_addr_range, rb_node);
241
242 if (piar->pcidev == dev) {
243 rb_erase(n, &pci_io_addr_cache_root.rb_root);
244 kfree(piar);
245 goto restart;
246 }
247 n = rb_next(n);
248 }
249}
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259
260void eeh_addr_cache_rmv_dev(struct pci_dev *dev)
261{
262 unsigned long flags;
263
264 spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
265 __eeh_addr_cache_rmv_dev(dev);
266 spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
267}
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277
278void eeh_addr_cache_build(void)
279{
280 struct pci_dn *pdn;
281 struct eeh_dev *edev;
282 struct pci_dev *dev = NULL;
283
284 spin_lock_init(&pci_io_addr_cache_root.piar_lock);
285
286 for_each_pci_dev(dev) {
287 pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn);
288 if (!pdn)
289 continue;
290
291 edev = pdn_to_eeh_dev(pdn);
292 if (!edev)
293 continue;
294
295 dev->dev.archdata.edev = edev;
296 edev->pdev = dev;
297
298 eeh_addr_cache_insert_dev(dev);
299 eeh_sysfs_add_device(dev);
300 }
301
302#ifdef DEBUG
303
304 eeh_addr_cache_print(&pci_io_addr_cache_root);
305#endif
306}
307