diff options
| -rw-r--r-- | arch/powerpc/mm/numa.c | 209 |
1 files changed, 170 insertions, 39 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index dc704da..39328da 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -268,6 +268,144 @@ static unsigned long __devinit read_n_cells(int n, const unsigned int **buf) return result; } +struct of_drconf_cell { + u64 base_addr; + u32 drc_index; + u32 reserved; + u32 aa_index; + u32 flags; +}; + +#define DRCONF_MEM_ASSIGNED 0x00000008 +#define DRCONF_MEM_AI_INVALID 0x00000040 +#define DRCONF_MEM_RESERVED 0x00000080 + +/* + * Read the next lmb list entry from the ibm,dynamic-memory property + * and return the information in the provided of_drconf_cell structure. + */ +static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp) +{ + const u32 *cp; + + drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp); + + cp = *cellp; + drmem->drc_index = cp[0]; + drmem->reserved = cp[1]; + drmem->aa_index = cp[2]; + drmem->flags = cp[3]; + + *cellp = cp + 4; +} + +/* + * Retreive and validate the ibm,dynamic-memory property of the device tree. + * + * The layout of the ibm,dynamic-memory property is a number N of lmb + * list entries followed by N lmb list entries. Each lmb list entry + * contains information as layed out in the of_drconf_cell struct above. + */ +static int of_get_drconf_memory(struct device_node *memory, const u32 **dm) +{ + const u32 *prop; + u32 len, entries; + + prop = of_get_property(memory, "ibm,dynamic-memory", &len); + if (!prop || len < sizeof(unsigned int)) + return 0; + + entries = *prop++; + + /* Now that we know the number of entries, revalidate the size + * of the property read in to ensure we have everything + */ + if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int)) + return 0; + + *dm = prop; + return entries; +} + +/* + * Retreive and validate the ibm,lmb-size property for drconf memory + * from the device tree. + */ +static u64 of_get_lmb_size(struct device_node *memory) +{ + const u32 *prop; + u32 len; + + prop = of_get_property(memory, "ibm,lmb-size", &len); + if (!prop || len < sizeof(unsigned int)) + return 0; + + return read_n_cells(n_mem_size_cells, &prop); +} + +struct assoc_arrays { + u32 n_arrays; + u32 array_sz; + const u32 *arrays; +}; + +/* + * Retreive and validate the list of associativity arrays for drconf + * memory from the ibm,associativity-lookup-arrays property of the + * device tree.. + * + * The layout of the ibm,associativity-lookup-arrays property is a number N + * indicating the number of associativity arrays, followed by a number M + * indicating the size of each associativity array, followed by a list + * of N associativity arrays. + */ +static int of_get_assoc_arrays(struct device_node *memory, + struct assoc_arrays *aa) +{ + const u32 *prop; + u32 len; + + prop = of_get_property(memory, "ibm,associativity-lookup-arrays", &len); + if (!prop || len < 2 * sizeof(unsigned int)) + return -1; + + aa->n_arrays = *prop++; + aa->array_sz = *prop++; + + /* Now that we know the number of arrrays and size of each array, + * revalidate the size of the property read in. + */ + if (len < (aa->n_arrays * aa->array_sz + 2) * sizeof(unsigned int)) + return -1; + + aa->arrays = prop; + return 0; +} + +/* + * This is like of_node_to_nid_single() for memory represented in the + * ibm,dynamic-reconfiguration-memory node. + */ +static int of_drconf_to_nid_single(struct of_drconf_cell *drmem, + struct assoc_arrays *aa) +{ + int default_nid = 0; + int nid = default_nid; + int index; + + if (min_common_depth > 0 && min_common_depth <= aa->array_sz && + !(drmem->flags & DRCONF_MEM_AI_INVALID) && + drmem->aa_index < aa->n_arrays) { + index = drmem->aa_index * aa->array_sz + min_common_depth - 1; + nid = aa->arrays[index]; + + if (nid == 0xffff || nid >= MAX_NUMNODES) + nid = default_nid; + } + + return nid; +} + /* * Figure out to which domain a cpu belongs and stick it there. * Return the id of the domain used. @@ -355,57 +493,50 @@ static unsigned long __init numa_enforce_memory_limit(unsigned long start, */ static void __init parse_drconf_memory(struct device_node *memory) { - const unsigned int *lm, *dm, *aa; - unsigned int ls, ld, la; - unsigned int n, aam, aalen; - unsigned long lmb_size, size, start; - int nid, default_nid = 0; - unsigned int ai, flags; - - lm = of_get_property(memory, "ibm,lmb-size", &ls); - dm = of_get_property(memory, "ibm,dynamic-memory", &ld); - aa = of_get_property(memory, "ibm,associativity-lookup-arrays", &la); - if (!lm || !dm || !aa || - ls < sizeof(unsigned int) || ld < sizeof(unsigned int) || - la < 2 * sizeof(unsigned int)) + const u32 *dm; + unsigned int n, rc; + unsigned long lmb_size, size; + int nid; + struct assoc_arrays aa; + + n = of_get_drconf_memory(memory, &dm); + if (!n) return; - lmb_size = read_n_cells(n_mem_size_cells, &lm); - n = *dm++; /* number of LMBs */ - aam = *aa++; /* number of associativity lists */ - aalen = *aa++; /* length of each associativity list */ - if (ld < (n * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int) || - la < (aam * aalen + 2) * sizeof(unsigned int)) + lmb_size = of_get_lmb_size(memory); + if (!lmb_size) + return; + + rc = of_get_assoc_arrays(memory, &aa); + if (rc) return; for (; n != 0; --n) { - start = read_n_cells(n_mem_addr_cells, &dm); - ai = dm[2]; - flags = dm[3]; - dm += 4; - /* 0x80 == reserved, 0x8 = assigned to us */ - if ((flags & 0x80) || !(flags & 0x8)) + struct of_drconf_cell drmem; + + read_drconf_cell(&drmem, &dm); + + /* skip this block if the reserved bit is set in flags (0x80) + or if the block is not assigned to this partition (0x8) */ + if ((drmem.flags & DRCONF_MEM_RESERVED) + || !(drmem.flags & DRCONF_MEM_ASSIGNED)) continue; - nid = default_nid; - /* flags & 0x40 means associativity index is invalid */ - if (min_common_depth > 0 && min_common_depth <= aalen && - (flags & 0x40) == 0 && ai < aam) { - /* this is like of_node_to_nid_single */ - nid = aa[ai * aalen + min_common_depth - 1]; - if (nid == 0xffff || nid >= MAX_NUMNODES) - nid = default_nid; - } - fake_numa_create_new_node(((start + lmb_size) >> PAGE_SHIFT), - &nid); + nid = of_drconf_to_nid_single(&drmem, &aa); + + fake_numa_create_new_node( + ((drmem.base_addr + lmb_size) >> PAGE_SHIFT), + &nid); + node_set_online(nid); - size = numa_enforce_memory_limit(start, lmb_size); + size = numa_enforce_memory_limit(drmem.base_addr, lmb_size); if (!size) continue; - add_active_range(nid, start >> PAGE_SHIFT, - (start >> PAGE_SHIFT) + (size >> PAGE_SHIFT)); + add_active_range(nid, drmem.base_addr >> PAGE_SHIFT, + (drmem.base_addr >> PAGE_SHIFT) + + (size >> PAGE_SHIFT)); } } |