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Linux/arch/powerpc/platforms/pseries/hotplug-memory.c

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  1 /*
  2  * pseries Memory Hotplug infrastructure.
  3  *
  4  * Copyright (C) 2008 Badari Pulavarty, IBM Corporation
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License
  8  *      as published by the Free Software Foundation; either version
  9  *      2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/of.h>
 13 #include <linux/memblock.h>
 14 #include <linux/vmalloc.h>
 15 #include <linux/memory.h>
 16 
 17 #include <asm/firmware.h>
 18 #include <asm/machdep.h>
 19 #include <asm/sparsemem.h>
 20 
 21 static unsigned long get_memblock_size(void)
 22 {
 23         struct device_node *np;
 24         unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE;
 25         struct resource r;
 26 
 27         np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
 28         if (np) {
 29                 const __be64 *size;
 30 
 31                 size = of_get_property(np, "ibm,lmb-size", NULL);
 32                 if (size)
 33                         memblock_size = be64_to_cpup(size);
 34                 of_node_put(np);
 35         } else  if (machine_is(pseries)) {
 36                 /* This fallback really only applies to pseries */
 37                 unsigned int memzero_size = 0;
 38 
 39                 np = of_find_node_by_path("/memory@0");
 40                 if (np) {
 41                         if (!of_address_to_resource(np, 0, &r))
 42                                 memzero_size = resource_size(&r);
 43                         of_node_put(np);
 44                 }
 45 
 46                 if (memzero_size) {
 47                         /* We now know the size of memory@0, use this to find
 48                          * the first memoryblock and get its size.
 49                          */
 50                         char buf[64];
 51 
 52                         sprintf(buf, "/memory@%x", memzero_size);
 53                         np = of_find_node_by_path(buf);
 54                         if (np) {
 55                                 if (!of_address_to_resource(np, 0, &r))
 56                                         memblock_size = resource_size(&r);
 57                                 of_node_put(np);
 58                         }
 59                 }
 60         }
 61         return memblock_size;
 62 }
 63 
 64 /* WARNING: This is going to override the generic definition whenever
 65  * pseries is built-in regardless of what platform is active at boot
 66  * time. This is fine for now as this is the only "option" and it
 67  * should work everywhere. If not, we'll have to turn this into a
 68  * ppc_md. callback
 69  */
 70 unsigned long memory_block_size_bytes(void)
 71 {
 72         return get_memblock_size();
 73 }
 74 
 75 #ifdef CONFIG_MEMORY_HOTREMOVE
 76 static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size)
 77 {
 78         unsigned long start, start_pfn;
 79         struct zone *zone;
 80         int ret;
 81         unsigned long section;
 82         unsigned long sections_to_remove;
 83 
 84         start_pfn = base >> PAGE_SHIFT;
 85 
 86         if (!pfn_valid(start_pfn)) {
 87                 memblock_remove(base, memblock_size);
 88                 return 0;
 89         }
 90 
 91         zone = page_zone(pfn_to_page(start_pfn));
 92 
 93         /*
 94          * Remove section mappings and sysfs entries for the
 95          * section of the memory we are removing.
 96          *
 97          * NOTE: Ideally, this should be done in generic code like
 98          * remove_memory(). But remove_memory() gets called by writing
 99          * to sysfs "state" file and we can't remove sysfs entries
100          * while writing to it. So we have to defer it to here.
101          */
102         sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
103         for (section = 0; section < sections_to_remove; section++) {
104                 unsigned long pfn = start_pfn + section * PAGES_PER_SECTION;
105                 ret = __remove_pages(zone, pfn, PAGES_PER_SECTION);
106                 if (ret)
107                         return ret;
108         }
109 
110         /*
111          * Update memory regions for memory remove
112          */
113         memblock_remove(base, memblock_size);
114 
115         /*
116          * Remove htab bolted mappings for this section of memory
117          */
118         start = (unsigned long)__va(base);
119         ret = remove_section_mapping(start, start + memblock_size);
120 
121         /* Ensure all vmalloc mappings are flushed in case they also
122          * hit that section of memory
123          */
124         vm_unmap_aliases();
125 
126         return ret;
127 }
128 
129 static int pseries_remove_memory(struct device_node *np)
130 {
131         const char *type;
132         const unsigned int *regs;
133         unsigned long base;
134         unsigned int lmb_size;
135         int ret = -EINVAL;
136 
137         /*
138          * Check to see if we are actually removing memory
139          */
140         type = of_get_property(np, "device_type", NULL);
141         if (type == NULL || strcmp(type, "memory") != 0)
142                 return 0;
143 
144         /*
145          * Find the bae address and size of the memblock
146          */
147         regs = of_get_property(np, "reg", NULL);
148         if (!regs)
149                 return ret;
150 
151         base = *(unsigned long *)regs;
152         lmb_size = regs[3];
153 
154         ret = pseries_remove_memblock(base, lmb_size);
155         return ret;
156 }
157 #else
158 static inline int pseries_remove_memblock(unsigned long base,
159                                           unsigned int memblock_size)
160 {
161         return 0;
162 }
163 static inline int pseries_remove_memory(struct device_node *np)
164 {
165         return -EOPNOTSUPP;
166 }
167 #endif /* CONFIG_MEMORY_HOTREMOVE */
168 
169 static int pseries_add_memory(struct device_node *np)
170 {
171         const char *type;
172         const unsigned int *regs;
173         unsigned long base;
174         unsigned int lmb_size;
175         int ret = -EINVAL;
176 
177         /*
178          * Check to see if we are actually adding memory
179          */
180         type = of_get_property(np, "device_type", NULL);
181         if (type == NULL || strcmp(type, "memory") != 0)
182                 return 0;
183 
184         /*
185          * Find the base and size of the memblock
186          */
187         regs = of_get_property(np, "reg", NULL);
188         if (!regs)
189                 return ret;
190 
191         base = *(unsigned long *)regs;
192         lmb_size = regs[3];
193 
194         /*
195          * Update memory region to represent the memory add
196          */
197         ret = memblock_add(base, lmb_size);
198         return (ret < 0) ? -EINVAL : 0;
199 }
200 
201 static int pseries_update_drconf_memory(struct of_prop_reconfig *pr)
202 {
203         struct of_drconf_cell *new_drmem, *old_drmem;
204         unsigned long memblock_size;
205         u32 entries;
206         u32 *p;
207         int i, rc = -EINVAL;
208 
209         memblock_size = get_memblock_size();
210         if (!memblock_size)
211                 return -EINVAL;
212 
213         p = (u32 *)of_get_property(pr->dn, "ibm,dynamic-memory", NULL);
214         if (!p)
215                 return -EINVAL;
216 
217         /* The first int of the property is the number of lmb's described
218          * by the property. This is followed by an array of of_drconf_cell
219          * entries. Get the niumber of entries and skip to the array of
220          * of_drconf_cell's.
221          */
222         entries = *p++;
223         old_drmem = (struct of_drconf_cell *)p;
224 
225         p = (u32 *)pr->prop->value;
226         p++;
227         new_drmem = (struct of_drconf_cell *)p;
228 
229         for (i = 0; i < entries; i++) {
230                 if ((old_drmem[i].flags & DRCONF_MEM_ASSIGNED) &&
231                     (!(new_drmem[i].flags & DRCONF_MEM_ASSIGNED))) {
232                         rc = pseries_remove_memblock(old_drmem[i].base_addr,
233                                                      memblock_size);
234                         break;
235                 } else if ((!(old_drmem[i].flags & DRCONF_MEM_ASSIGNED)) &&
236                            (new_drmem[i].flags & DRCONF_MEM_ASSIGNED)) {
237                         rc = memblock_add(old_drmem[i].base_addr,
238                                           memblock_size);
239                         rc = (rc < 0) ? -EINVAL : 0;
240                         break;
241                 }
242         }
243 
244         return rc;
245 }
246 
247 static int pseries_memory_notifier(struct notifier_block *nb,
248                                    unsigned long action, void *node)
249 {
250         struct of_prop_reconfig *pr;
251         int err = 0;
252 
253         switch (action) {
254         case OF_RECONFIG_ATTACH_NODE:
255                 err = pseries_add_memory(node);
256                 break;
257         case OF_RECONFIG_DETACH_NODE:
258                 err = pseries_remove_memory(node);
259                 break;
260         case OF_RECONFIG_UPDATE_PROPERTY:
261                 pr = (struct of_prop_reconfig *)node;
262                 if (!strcmp(pr->prop->name, "ibm,dynamic-memory"))
263                         err = pseries_update_drconf_memory(pr);
264                 break;
265         }
266         return notifier_from_errno(err);
267 }
268 
269 static struct notifier_block pseries_mem_nb = {
270         .notifier_call = pseries_memory_notifier,
271 };
272 
273 static int __init pseries_memory_hotplug_init(void)
274 {
275         if (firmware_has_feature(FW_FEATURE_LPAR))
276                 of_reconfig_notifier_register(&pseries_mem_nb);
277 
278         return 0;
279 }
280 machine_device_initcall(pseries, pseries_memory_hotplug_init);
281 

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