1 /* Palacios memory manager
5 #include <asm/page_64_types.h>
6 #include <linux/kernel.h>
7 #include <linux/list.h>
8 #include <linux/slab.h>
10 //static struct list_head pools;
16 #include "palacios/vmm.h"
19 static struct buddy_memzone ** memzones = NULL;
20 static uintptr_t * seed_addrs = NULL;
23 // alignment is in bytes
24 uintptr_t alloc_palacios_pgs(u64 num_pages, u32 alignment, int node_id, int constraints) {
26 int any = node_id==-1; // can allocate on any
27 int buddy_constraints=0;
29 if (constraints && constraints!=V3_ALLOC_PAGES_CONSTRAINT_4GB) {
30 ERROR("Unknown constraint mask 0x%x\n",constraints);
34 if (constraints & V3_ALLOC_PAGES_CONSTRAINT_4GB) {
35 buddy_constraints |= LWK_BUDDY_CONSTRAINT_4GB;
40 int cpu_id = get_cpu();
43 node_id = numa_cpu_to_node(cpu_id); // try first preferentially for the calling pcore
45 } else if (numa_num_nodes() == 1) {
47 } else if (node_id >= numa_num_nodes()) {
48 ERROR("Requesting memory from an invalid NUMA node. (Node: %d) (%d nodes on system)\n",
49 node_id, numa_num_nodes());
53 addr = buddy_alloc(memzones[node_id], get_order(num_pages * PAGE_SIZE) + PAGE_SHIFT, buddy_constraints);
57 // do a scan to see if we can satisfy request on any node
58 for (i=0; i< numa_num_nodes(); i++) {
60 addr = buddy_alloc(memzones[i], get_order(num_pages * PAGE_SIZE) + PAGE_SHIFT, buddy_constraints);
69 //DEBUG("Returning from alloc addr=%p, vaddr=%p\n", (void *)addr, __va(addr));
75 void free_palacios_pgs(uintptr_t pg_addr, u64 num_pages) {
76 int node_id = numa_addr_to_node(pg_addr);
78 //DEBUG("Freeing Memory page %p\n", (void *)pg_addr);
79 buddy_free(memzones[node_id], pg_addr, get_order(num_pages * PAGE_SIZE) + PAGE_SHIFT);
85 unsigned long long pow2(int i)
87 unsigned long long x=1;
88 for (;i!=0;i--) { x*=2; }
92 int add_palacios_memory(struct v3_mem_region *r) {
96 struct v3_mem_region *keep;
98 INFO("Palacios Memory Add Request: type=%d, node=%d, base_addr=0x%llx, num_pages=%llu\n",r->type,r->node,r->base_addr,r->num_pages);
100 // fixup request regardless of its type
101 if (r->num_pages*4096 < V3_CONFIG_MEM_BLOCK_SIZE) {
102 WARNING("Allocating a memory pool smaller than the Palacios block size - may not be useful\n");
105 if (pow2(get_order(r->num_pages*PAGE_SIZE)) != r->num_pages) {
106 WARNING("Allocating a memory pool that is not a power of two (is %llu) - it will be rounded down!\n", r->num_pages);
107 r->num_pages=pow2(get_order(r->num_pages*PAGE_SIZE));
108 WARNING("Rounded request is for %llu pages\n", r->num_pages);
112 if (!(keep=palacios_alloc(sizeof(struct v3_mem_region)))) {
113 ERROR("Error allocating space for tracking region\n");
118 if (r->type==REQUESTED || r->type==REQUESTED32) {
121 INFO("Attempting to allocate %llu pages of %s memory\n", r->num_pages,
122 r->type==REQUESTED ? "64 bit (unrestricted)" :
123 r->type==REQUESTED32 ? "32 bit (restricted)" : "unknown (assuming 64 bit unrestricted)");
125 pgs = alloc_pages_node(r->node,
126 r->type==REQUESTED ? GFP_KERNEL :
127 r->type==REQUESTED32 ? GFP_DMA32 : GFP_KERNEL,
128 get_order(r->num_pages*PAGE_SIZE));
130 ERROR("Unable to satisfy allocation request\n");
134 r->base_addr = page_to_pfn(pgs) << PAGE_SHIFT;
140 node_id = numa_addr_to_node(r->base_addr);
143 ERROR("Error locating node for addr %p\n", (void *)(r->base_addr));
147 if ((node_id != r->node) && (r->node!=-1)) {
148 INFO("Memory add request is for node %d, but memory is in node %d\n",r->node,node_id);
151 pool_order = get_order(r->num_pages * PAGE_SIZE) + PAGE_SHIFT;
153 if (buddy_add_pool(memzones[node_id], r->base_addr, pool_order, keep)) {
154 ERROR("ALERT ALERT ALERT Unable to add pool to buddy allocator...\n");
155 if (r->type==REQUESTED || r->type==REQUESTED32) {
156 free_pages((uintptr_t)__va(r->base_addr), get_order(r->num_pages));
167 int palacios_remove_memory(uintptr_t base_addr) {
168 int node_id = numa_addr_to_node(base_addr);
169 struct v3_mem_region *r;
171 if (buddy_remove_pool(memzones[node_id], base_addr, 0, (void**)(&r))) { //unforced remove
172 ERROR("Cannot remove memory at base address 0x%p because it is in use\n", (void*)base_addr);
176 if (r->type==REQUESTED || r->type==REQUESTED32) {
177 free_pages((uintptr_t)__va(r->base_addr), get_order(r->num_pages));
179 // user space resposible for onlining
189 int palacios_deinit_mm( void ) {
194 for (i = 0; i < numa_num_nodes(); i++) {
197 buddy_deinit(memzones[i]);
200 // note that the memory is not onlined here - offlining and onlining
201 // is the resposibility of the caller
204 // free the seed regions
205 free_pages((uintptr_t)__va(seed_addrs[i]), MAX_ORDER - 1);
209 palacios_free(memzones);
210 palacios_free(seed_addrs);
216 int palacios_init_mm( void ) {
217 int num_nodes = numa_num_nodes();
220 INFO("memory manager init: MAX_ORDER=%d (%llu bytes)\n",MAX_ORDER, PAGE_SIZE*pow2(MAX_ORDER));
222 memzones = palacios_alloc_extended(sizeof(struct buddy_memzone *) * num_nodes, GFP_KERNEL,-1);
225 ERROR("Cannot allocate space for memory zones\n");
226 palacios_deinit_mm();
230 memset(memzones, 0, sizeof(struct buddy_memzone *) * num_nodes);
232 seed_addrs = palacios_alloc_extended(sizeof(uintptr_t) * num_nodes, GFP_KERNEL,-1);
235 ERROR("Cannot allocate space for seed addrs\n");
236 palacios_deinit_mm();
240 memset(seed_addrs, 0, sizeof(uintptr_t) * num_nodes);
242 for (node_id = 0; node_id < num_nodes; node_id++) {
243 struct buddy_memzone * zone = NULL;
245 // Seed the allocator with a small set of pages to allow initialization to complete.
246 // For now we will just grab some random pages, but in the future we will need to grab NUMA specific regions
247 // See: alloc_pages_node()
252 // attempt to first allocate below 4 GB for compatibility with
253 // 32 bit shadow paging
254 pgs = alloc_pages_node(node_id, GFP_DMA32, MAX_ORDER - 1);
257 INFO("Could not allocate initial memory block for node %d beloew 4GB\n", node_id);
259 pgs = alloc_pages_node(node_id, GFP_KERNEL, MAX_ORDER - 1);
262 INFO("Could not allocate initial memory block for node %d beloew 4GB\n", node_id);
264 ERROR("Could not allocate initial memory block for node %d without restrictions\n", node_id);
266 palacios_deinit_mm();
272 seed_addrs[node_id] = page_to_pfn(pgs) << PAGE_SHIFT;
275 zone = buddy_init(get_order(V3_CONFIG_MEM_BLOCK_SIZE) + PAGE_SHIFT, PAGE_SHIFT, node_id);
278 ERROR("Could not initialization memory management for node %d\n", node_id);
279 palacios_deinit_mm();
283 printk("Zone initialized, Adding seed region (order=%d)\n",
284 (MAX_ORDER - 1) + PAGE_SHIFT);
286 if (buddy_add_pool(zone, seed_addrs[node_id], (MAX_ORDER - 1) + PAGE_SHIFT,0)) {
287 ERROR("Could not add pool to buddy allocator\n");
288 palacios_deinit_mm();
292 memzones[node_id] = zone;