![Tejun Heo](/assets/img/avatar_default.png)
Now that NUMA init path is unified, NUMA emulation can be enabled on 32bit. Make numa_emluation.c safe on 32bit by doing the followings. * Define MAX_DMA32_PFN on 32bit too. * Include bootmem.h for max_pfn declaration. * Use u64 explicitly and always use PFN_PHYS() when converting page number to address. * Avoid __udivdi3() generation on 32bit by doing number of pages calculation instead in split_nodes_interleave(). And drop X86_64 dependency from Kconfig. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com>
493 lines
13 KiB
C
493 lines
13 KiB
C
/*
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* NUMA emulation
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/topology.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h>
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#include <asm/dma.h>
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#include "numa_internal.h"
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static int emu_nid_to_phys[MAX_NUMNODES] __cpuinitdata;
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static char *emu_cmdline __initdata;
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void __init numa_emu_cmdline(char *str)
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{
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emu_cmdline = str;
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}
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static int __init emu_find_memblk_by_nid(int nid, const struct numa_meminfo *mi)
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{
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int i;
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for (i = 0; i < mi->nr_blks; i++)
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if (mi->blk[i].nid == nid)
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return i;
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return -ENOENT;
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}
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/*
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* Sets up nid to range from @start to @end. The return value is -errno if
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* something went wrong, 0 otherwise.
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*/
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static int __init emu_setup_memblk(struct numa_meminfo *ei,
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struct numa_meminfo *pi,
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int nid, int phys_blk, u64 size)
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{
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struct numa_memblk *eb = &ei->blk[ei->nr_blks];
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struct numa_memblk *pb = &pi->blk[phys_blk];
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if (ei->nr_blks >= NR_NODE_MEMBLKS) {
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pr_err("NUMA: Too many emulated memblks, failing emulation\n");
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return -EINVAL;
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}
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ei->nr_blks++;
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eb->start = pb->start;
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eb->end = pb->start + size;
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eb->nid = nid;
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if (emu_nid_to_phys[nid] == NUMA_NO_NODE)
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emu_nid_to_phys[nid] = pb->nid;
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pb->start += size;
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if (pb->start >= pb->end) {
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WARN_ON_ONCE(pb->start > pb->end);
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numa_remove_memblk_from(phys_blk, pi);
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}
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printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid,
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eb->start, eb->end, (eb->end - eb->start) >> 20);
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return 0;
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}
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/*
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* Sets up nr_nodes fake nodes interleaved over physical nodes ranging from addr
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* to max_addr. The return value is the number of nodes allocated.
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*/
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static int __init split_nodes_interleave(struct numa_meminfo *ei,
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struct numa_meminfo *pi,
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u64 addr, u64 max_addr, int nr_nodes)
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{
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nodemask_t physnode_mask = NODE_MASK_NONE;
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u64 size;
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int big;
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int nid = 0;
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int i, ret;
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if (nr_nodes <= 0)
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return -1;
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if (nr_nodes > MAX_NUMNODES) {
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pr_info("numa=fake=%d too large, reducing to %d\n",
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nr_nodes, MAX_NUMNODES);
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nr_nodes = MAX_NUMNODES;
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}
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/*
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* Calculate target node size. x86_32 freaks on __udivdi3() so do
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* the division in ulong number of pages and convert back.
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*/
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size = max_addr - addr - memblock_x86_hole_size(addr, max_addr);
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size = PFN_PHYS((unsigned long)(size >> PAGE_SHIFT) / nr_nodes);
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/*
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* Calculate the number of big nodes that can be allocated as a result
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* of consolidating the remainder.
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*/
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big = ((size & ~FAKE_NODE_MIN_HASH_MASK) * nr_nodes) /
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FAKE_NODE_MIN_SIZE;
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size &= FAKE_NODE_MIN_HASH_MASK;
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if (!size) {
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pr_err("Not enough memory for each node. "
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"NUMA emulation disabled.\n");
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return -1;
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}
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for (i = 0; i < pi->nr_blks; i++)
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node_set(pi->blk[i].nid, physnode_mask);
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/*
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* Continue to fill physical nodes with fake nodes until there is no
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* memory left on any of them.
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*/
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while (nodes_weight(physnode_mask)) {
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for_each_node_mask(i, physnode_mask) {
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u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
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u64 start, limit, end;
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int phys_blk;
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phys_blk = emu_find_memblk_by_nid(i, pi);
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if (phys_blk < 0) {
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node_clear(i, physnode_mask);
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continue;
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}
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start = pi->blk[phys_blk].start;
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limit = pi->blk[phys_blk].end;
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end = start + size;
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if (nid < big)
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end += FAKE_NODE_MIN_SIZE;
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/*
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* Continue to add memory to this fake node if its
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* non-reserved memory is less than the per-node size.
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*/
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while (end - start -
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memblock_x86_hole_size(start, end) < size) {
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end += FAKE_NODE_MIN_SIZE;
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if (end > limit) {
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end = limit;
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break;
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}
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}
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/*
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* If there won't be at least FAKE_NODE_MIN_SIZE of
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* non-reserved memory in ZONE_DMA32 for the next node,
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* this one must extend to the boundary.
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*/
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if (end < dma32_end && dma32_end - end -
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memblock_x86_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
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end = dma32_end;
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/*
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* If there won't be enough non-reserved memory for the
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* next node, this one must extend to the end of the
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* physical node.
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*/
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if (limit - end -
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memblock_x86_hole_size(end, limit) < size)
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end = limit;
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ret = emu_setup_memblk(ei, pi, nid++ % nr_nodes,
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phys_blk,
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min(end, limit) - start);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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/*
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* Returns the end address of a node so that there is at least `size' amount of
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* non-reserved memory or `max_addr' is reached.
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*/
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static u64 __init find_end_of_node(u64 start, u64 max_addr, u64 size)
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{
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u64 end = start + size;
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while (end - start - memblock_x86_hole_size(start, end) < size) {
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end += FAKE_NODE_MIN_SIZE;
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if (end > max_addr) {
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end = max_addr;
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break;
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}
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}
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return end;
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}
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/*
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* Sets up fake nodes of `size' interleaved over physical nodes ranging from
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* `addr' to `max_addr'. The return value is the number of nodes allocated.
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*/
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static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
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struct numa_meminfo *pi,
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u64 addr, u64 max_addr, u64 size)
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{
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nodemask_t physnode_mask = NODE_MASK_NONE;
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u64 min_size;
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int nid = 0;
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int i, ret;
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if (!size)
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return -1;
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/*
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* The limit on emulated nodes is MAX_NUMNODES, so the size per node is
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* increased accordingly if the requested size is too small. This
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* creates a uniform distribution of node sizes across the entire
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* machine (but not necessarily over physical nodes).
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*/
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min_size = (max_addr - addr - memblock_x86_hole_size(addr, max_addr)) /
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MAX_NUMNODES;
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min_size = max(min_size, FAKE_NODE_MIN_SIZE);
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if ((min_size & FAKE_NODE_MIN_HASH_MASK) < min_size)
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min_size = (min_size + FAKE_NODE_MIN_SIZE) &
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FAKE_NODE_MIN_HASH_MASK;
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if (size < min_size) {
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pr_err("Fake node size %LuMB too small, increasing to %LuMB\n",
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size >> 20, min_size >> 20);
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size = min_size;
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}
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size &= FAKE_NODE_MIN_HASH_MASK;
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for (i = 0; i < pi->nr_blks; i++)
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node_set(pi->blk[i].nid, physnode_mask);
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/*
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* Fill physical nodes with fake nodes of size until there is no memory
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* left on any of them.
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*/
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while (nodes_weight(physnode_mask)) {
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for_each_node_mask(i, physnode_mask) {
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u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
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u64 start, limit, end;
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int phys_blk;
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phys_blk = emu_find_memblk_by_nid(i, pi);
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if (phys_blk < 0) {
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node_clear(i, physnode_mask);
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continue;
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}
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start = pi->blk[phys_blk].start;
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limit = pi->blk[phys_blk].end;
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end = find_end_of_node(start, limit, size);
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/*
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* If there won't be at least FAKE_NODE_MIN_SIZE of
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* non-reserved memory in ZONE_DMA32 for the next node,
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* this one must extend to the boundary.
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*/
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if (end < dma32_end && dma32_end - end -
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memblock_x86_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
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end = dma32_end;
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/*
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* If there won't be enough non-reserved memory for the
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* next node, this one must extend to the end of the
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* physical node.
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*/
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if (limit - end -
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memblock_x86_hole_size(end, limit) < size)
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end = limit;
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ret = emu_setup_memblk(ei, pi, nid++ % MAX_NUMNODES,
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phys_blk,
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min(end, limit) - start);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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/**
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* numa_emulation - Emulate NUMA nodes
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* @numa_meminfo: NUMA configuration to massage
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* @numa_dist_cnt: The size of the physical NUMA distance table
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*
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* Emulate NUMA nodes according to the numa=fake kernel parameter.
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* @numa_meminfo contains the physical memory configuration and is modified
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* to reflect the emulated configuration on success. @numa_dist_cnt is
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* used to determine the size of the physical distance table.
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*
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* On success, the following modifications are made.
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*
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* - @numa_meminfo is updated to reflect the emulated nodes.
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*
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* - __apicid_to_node[] is updated such that APIC IDs are mapped to the
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* emulated nodes.
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*
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* - NUMA distance table is rebuilt to represent distances between emulated
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* nodes. The distances are determined considering how emulated nodes
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* are mapped to physical nodes and match the actual distances.
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*
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* - emu_nid_to_phys[] reflects how emulated nodes are mapped to physical
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* nodes. This is used by numa_add_cpu() and numa_remove_cpu().
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*
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* If emulation is not enabled or fails, emu_nid_to_phys[] is filled with
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* identity mapping and no other modification is made.
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*/
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void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
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{
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static struct numa_meminfo ei __initdata;
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static struct numa_meminfo pi __initdata;
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const u64 max_addr = PFN_PHYS(max_pfn);
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u8 *phys_dist = NULL;
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size_t phys_size = numa_dist_cnt * numa_dist_cnt * sizeof(phys_dist[0]);
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int max_emu_nid, dfl_phys_nid;
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int i, j, ret;
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if (!emu_cmdline)
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goto no_emu;
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memset(&ei, 0, sizeof(ei));
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pi = *numa_meminfo;
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for (i = 0; i < MAX_NUMNODES; i++)
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emu_nid_to_phys[i] = NUMA_NO_NODE;
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/*
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* If the numa=fake command-line contains a 'M' or 'G', it represents
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* the fixed node size. Otherwise, if it is just a single number N,
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* split the system RAM into N fake nodes.
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*/
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if (strchr(emu_cmdline, 'M') || strchr(emu_cmdline, 'G')) {
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u64 size;
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size = memparse(emu_cmdline, &emu_cmdline);
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ret = split_nodes_size_interleave(&ei, &pi, 0, max_addr, size);
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} else {
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unsigned long n;
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n = simple_strtoul(emu_cmdline, NULL, 0);
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ret = split_nodes_interleave(&ei, &pi, 0, max_addr, n);
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}
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if (ret < 0)
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goto no_emu;
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if (numa_cleanup_meminfo(&ei) < 0) {
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pr_warning("NUMA: Warning: constructed meminfo invalid, disabling emulation\n");
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goto no_emu;
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}
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/* copy the physical distance table */
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if (numa_dist_cnt) {
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u64 phys;
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phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
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phys_size, PAGE_SIZE);
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if (phys == MEMBLOCK_ERROR) {
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pr_warning("NUMA: Warning: can't allocate copy of distance table, disabling emulation\n");
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goto no_emu;
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}
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memblock_x86_reserve_range(phys, phys + phys_size, "TMP NUMA DIST");
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phys_dist = __va(phys);
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for (i = 0; i < numa_dist_cnt; i++)
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for (j = 0; j < numa_dist_cnt; j++)
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phys_dist[i * numa_dist_cnt + j] =
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node_distance(i, j);
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}
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/*
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* Determine the max emulated nid and the default phys nid to use
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* for unmapped nodes.
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*/
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max_emu_nid = 0;
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dfl_phys_nid = NUMA_NO_NODE;
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for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) {
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if (emu_nid_to_phys[i] != NUMA_NO_NODE) {
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max_emu_nid = i;
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if (dfl_phys_nid == NUMA_NO_NODE)
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dfl_phys_nid = emu_nid_to_phys[i];
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}
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}
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if (dfl_phys_nid == NUMA_NO_NODE) {
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pr_warning("NUMA: Warning: can't determine default physical node, disabling emulation\n");
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goto no_emu;
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}
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/* commit */
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*numa_meminfo = ei;
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/*
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* Transform __apicid_to_node table to use emulated nids by
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* reverse-mapping phys_nid. The maps should always exist but fall
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* back to zero just in case.
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*/
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for (i = 0; i < ARRAY_SIZE(__apicid_to_node); i++) {
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if (__apicid_to_node[i] == NUMA_NO_NODE)
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continue;
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for (j = 0; j < ARRAY_SIZE(emu_nid_to_phys); j++)
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if (__apicid_to_node[i] == emu_nid_to_phys[j])
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break;
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__apicid_to_node[i] = j < ARRAY_SIZE(emu_nid_to_phys) ? j : 0;
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}
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/* make sure all emulated nodes are mapped to a physical node */
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for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++)
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if (emu_nid_to_phys[i] == NUMA_NO_NODE)
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emu_nid_to_phys[i] = dfl_phys_nid;
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/* transform distance table */
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numa_reset_distance();
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for (i = 0; i < max_emu_nid + 1; i++) {
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for (j = 0; j < max_emu_nid + 1; j++) {
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int physi = emu_nid_to_phys[i];
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int physj = emu_nid_to_phys[j];
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int dist;
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if (physi >= numa_dist_cnt || physj >= numa_dist_cnt)
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dist = physi == physj ?
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LOCAL_DISTANCE : REMOTE_DISTANCE;
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else
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dist = phys_dist[physi * numa_dist_cnt + physj];
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numa_set_distance(i, j, dist);
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}
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}
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/* free the copied physical distance table */
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if (phys_dist)
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memblock_x86_free_range(__pa(phys_dist), __pa(phys_dist) + phys_size);
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return;
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no_emu:
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/* No emulation. Build identity emu_nid_to_phys[] for numa_add_cpu() */
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for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++)
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emu_nid_to_phys[i] = i;
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}
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#ifndef CONFIG_DEBUG_PER_CPU_MAPS
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void __cpuinit numa_add_cpu(int cpu)
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{
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int physnid, nid;
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nid = early_cpu_to_node(cpu);
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BUG_ON(nid == NUMA_NO_NODE || !node_online(nid));
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physnid = emu_nid_to_phys[nid];
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/*
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* Map the cpu to each emulated node that is allocated on the physical
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* node of the cpu's apic id.
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*/
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for_each_online_node(nid)
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if (emu_nid_to_phys[nid] == physnid)
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cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
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}
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void __cpuinit numa_remove_cpu(int cpu)
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{
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int i;
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for_each_online_node(i)
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cpumask_clear_cpu(cpu, node_to_cpumask_map[i]);
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}
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#else /* !CONFIG_DEBUG_PER_CPU_MAPS */
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static void __cpuinit numa_set_cpumask(int cpu, bool enable)
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{
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int nid, physnid;
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nid = early_cpu_to_node(cpu);
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if (nid == NUMA_NO_NODE) {
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/* early_cpu_to_node() already emits a warning and trace */
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return;
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}
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physnid = emu_nid_to_phys[nid];
|
|
|
|
for_each_online_node(nid) {
|
|
if (emu_nid_to_phys[nid] != physnid)
|
|
continue;
|
|
|
|
debug_cpumask_set_cpu(cpu, nid, enable);
|
|
}
|
|
}
|
|
|
|
void __cpuinit numa_add_cpu(int cpu)
|
|
{
|
|
numa_set_cpumask(cpu, true);
|
|
}
|
|
|
|
void __cpuinit numa_remove_cpu(int cpu)
|
|
{
|
|
numa_set_cpumask(cpu, false);
|
|
}
|
|
#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
|