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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 unsigned long addr_lo;
52 unsigned long addr_hi;
53 struct eeh_dev *edev;
54 struct pci_dev *pcidev;
55 unsigned int 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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91
92struct eeh_dev *eeh_addr_cache_get_dev(unsigned long addr)
93{
94 struct eeh_dev *edev;
95 unsigned long flags;
96
97 spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
98 edev = __eeh_addr_cache_get_device(addr);
99 spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
100 return edev;
101}
102
103#ifdef DEBUG
104
105
106
107
108static void eeh_addr_cache_print(struct pci_io_addr_cache *cache)
109{
110 struct rb_node *n;
111 int cnt = 0;
112
113 n = rb_first(&cache->rb_root);
114 while (n) {
115 struct pci_io_addr_range *piar;
116 piar = rb_entry(n, struct pci_io_addr_range, rb_node);
117 pr_debug("PCI: %s addr range %d [%lx-%lx]: %s\n",
118 (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt,
119 piar->addr_lo, piar->addr_hi, pci_name(piar->pcidev));
120 cnt++;
121 n = rb_next(n);
122 }
123}
124#endif
125
126
127static struct pci_io_addr_range *
128eeh_addr_cache_insert(struct pci_dev *dev, unsigned long alo,
129 unsigned long ahi, unsigned int flags)
130{
131 struct rb_node **p = &pci_io_addr_cache_root.rb_root.rb_node;
132 struct rb_node *parent = NULL;
133 struct pci_io_addr_range *piar;
134
135
136 while (*p) {
137 parent = *p;
138 piar = rb_entry(parent, struct pci_io_addr_range, rb_node);
139 if (ahi < piar->addr_lo) {
140 p = &parent->rb_left;
141 } else if (alo > piar->addr_hi) {
142 p = &parent->rb_right;
143 } else {
144 if (dev != piar->pcidev ||
145 alo != piar->addr_lo || ahi != piar->addr_hi) {
146 pr_warning("PIAR: overlapping address range\n");
147 }
148 return piar;
149 }
150 }
151 piar = kzalloc(sizeof(struct pci_io_addr_range), GFP_ATOMIC);
152 if (!piar)
153 return NULL;
154
155 piar->addr_lo = alo;
156 piar->addr_hi = ahi;
157 piar->edev = pci_dev_to_eeh_dev(dev);
158 piar->pcidev = dev;
159 piar->flags = flags;
160
161#ifdef DEBUG
162 pr_debug("PIAR: insert range=[%lx:%lx] dev=%s\n",
163 alo, ahi, pci_name(dev));
164#endif
165
166 rb_link_node(&piar->rb_node, parent, p);
167 rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root);
168
169 return piar;
170}
171
172static void __eeh_addr_cache_insert_dev(struct pci_dev *dev)
173{
174 struct device_node *dn;
175 struct eeh_dev *edev;
176 int i;
177
178 dn = pci_device_to_OF_node(dev);
179 if (!dn) {
180 pr_warning("PCI: no pci dn found for dev=%s\n", pci_name(dev));
181 return;
182 }
183
184 edev = of_node_to_eeh_dev(dn);
185 if (!edev) {
186 pr_warning("PCI: no EEH dev found for dn=%s\n",
187 dn->full_name);
188 return;
189 }
190
191
192 if (!eeh_probe_mode_dev() && !edev->pe) {
193#ifdef DEBUG
194 pr_info("PCI: skip building address cache for=%s - %s\n",
195 pci_name(dev), dn->full_name);
196#endif
197 return;
198 }
199
200
201 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
202 unsigned long start = pci_resource_start(dev,i);
203 unsigned long end = pci_resource_end(dev,i);
204 unsigned int 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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222
223void eeh_addr_cache_insert_dev(struct pci_dev *dev)
224{
225 unsigned long flags;
226
227
228 if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
229 return;
230
231 spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
232 __eeh_addr_cache_insert_dev(dev);
233 spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
234}
235
236static inline void __eeh_addr_cache_rmv_dev(struct pci_dev *dev)
237{
238 struct rb_node *n;
239
240restart:
241 n = rb_first(&pci_io_addr_cache_root.rb_root);
242 while (n) {
243 struct pci_io_addr_range *piar;
244 piar = rb_entry(n, struct pci_io_addr_range, rb_node);
245
246 if (piar->pcidev == dev) {
247 rb_erase(n, &pci_io_addr_cache_root.rb_root);
248 kfree(piar);
249 goto restart;
250 }
251 n = rb_next(n);
252 }
253}
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263
264void eeh_addr_cache_rmv_dev(struct pci_dev *dev)
265{
266 unsigned long flags;
267
268 spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
269 __eeh_addr_cache_rmv_dev(dev);
270 spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
271}
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280
281
282void eeh_addr_cache_build(void)
283{
284 struct device_node *dn;
285 struct eeh_dev *edev;
286 struct pci_dev *dev = NULL;
287
288 spin_lock_init(&pci_io_addr_cache_root.piar_lock);
289
290 for_each_pci_dev(dev) {
291 dn = pci_device_to_OF_node(dev);
292 if (!dn)
293 continue;
294
295 edev = of_node_to_eeh_dev(dn);
296 if (!edev)
297 continue;
298
299 dev->dev.archdata.edev = edev;
300 edev->pdev = dev;
301
302 eeh_addr_cache_insert_dev(dev);
303 eeh_sysfs_add_device(dev);
304 }
305
306#ifdef DEBUG
307
308 eeh_addr_cache_print(&pci_io_addr_cache_root);
309#endif
310}
311