From: Wang Wensheng wangwensheng4@huawei.com
ascend inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4N3XU CVE: NA
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Use a bootarg to precisely specify the target node to which we want to move the kernel structrue for a cdm node.
Signed-off-by: Wang Wensheng wangwensheng4@huawei.com Signed-off-by: Lijun Fang fanglijun3@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- arch/arm64/mm/numa.c | 82 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+)
diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c index a167b74272b2..480fcfb1b917 100644 --- a/arch/arm64/mm/numa.c +++ b/arch/arm64/mm/numa.c @@ -34,6 +34,85 @@ inline int arch_check_node_cdm(int nid) }
#ifdef CONFIG_ASCEND_CLEAN_CDM + +#define MAX_PARTATION_COUNT 8 +#define MAX_CDM_PER_PATRATION 8 + +/* + * Here we provide a way to precisely specify the target node to which we want + * to move the kernel structrue for a cdm node, instead of guessing the hardware + * topologies. Even the node isn't a cdm node, the movement could be reasonable. + * Suppose a node is designed to be used only by some certern processes and + * devices, the kernel structure of that node could be overwritten by a broken + * process. + * + * A possible configure in bootargs: + * cdm_move_map=0,2,3,6;1,4,5,7 + * That means to move the kernel structure for node 2,3,6 to node 0 and kernel + * structure for node 4,5,7 to node 1. + */ +static bool cdm_to_ddr_hardcode = true; +static int cdm_to_ddr_map[MAX_PARTATION_COUNT][MAX_CDM_PER_PATRATION + 1]; + +static int __init cdm_to_ddr_parse_param(char *str) +{ + int i, j; + char *p, *n; + + cdm_to_ddr_hardcode = false; + for (i = 0; i < MAX_PARTATION_COUNT; i++) + for (j = 0; j < MAX_CDM_PER_PATRATION + 1; j++) + cdm_to_ddr_map[i][j] = -1; + + for (p = n = str, i = 0; strsep(&p, ";"); i++, n = p) { + char *s = n; + + for (j = 0; strsep(&n, ","); j++, s = n) { + int err; + unsigned long long nid; + + if (j >= MAX_CDM_PER_PATRATION + 1) { + pr_warn("the cdm nodes in this partation is more than supported\n"); + break; + } + + err = kstrtoull(s, 0, &nid); + if (err) { + pr_err("bootargs for cdm_move_map invalid, %d\n", + err); + return err; + } + + cdm_to_ddr_map[i][j] = (int)nid; + if (j > 0) + pr_info("node %d moved to node %d\n", + cdm_to_ddr_map[i][j], + cdm_to_ddr_map[i][0]); + } + } + + return 0; +} +early_param("cdm_move_map", cdm_to_ddr_parse_param); + +static int __init cdm_node_to_ddr_node_mapped(int nid) +{ + int i, j; + + for (i = 0; i < MAX_PARTATION_COUNT; i++) { + if (cdm_to_ddr_map[i][0] == -1) + break; + for (j = 1; j < MAX_CDM_PER_PATRATION + 1; j++) { + if (cdm_to_ddr_map[i][j] == -1) + break; + else if (cdm_to_ddr_map[i][j] == nid) + return cdm_to_ddr_map[i][0]; + } + } + + return nid; +} + /** * cdm_node_to_ddr_node - Convert the cdm node to the ddr node of the * same partion. @@ -73,6 +152,9 @@ int __init cdm_node_to_ddr_node(int nid) */ int hbm_per_part = 2;
+ if (!cdm_to_ddr_hardcode) + return cdm_node_to_ddr_node_mapped(nid); + if (!nr_cdm || nodes_empty(numa_nodes_parsed)) return nid;