From a8328ee58c15c9d763a67607a35bb987b38950fa Mon Sep 17 00:00:00 2001 From: Cliff Wickman Date: Wed, 2 Jun 2010 16:22:02 -0500 Subject: [PATCH] x86, UV: Correct BAU discovery of hubs and sockets Correct the initialization-time assumption of contigous blade numbers and of sockets numbered from zero. There may be hubs present with no cpu's enabled. There may be disabled sockets such that the active socket is not number zero. And assign a 'socket master' by assuming that a socket is a node. (it is not safe to extract socket number from an apicid) Signed-off-by: Cliff Wickman Cc: gregkh@suse.de LKML-Reference: Signed-off-by: Ingo Molnar --- arch/x86/kernel/tlb_uv.c | 49 +++++++++++++++++++++++++--------------- 1 file changed, 31 insertions(+), 18 deletions(-) diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c index 295a41122da1..ab929e976502 100644 --- a/arch/x86/kernel/tlb_uv.c +++ b/arch/x86/kernel/tlb_uv.c @@ -1547,11 +1547,13 @@ calculate_destination_timeout(void) */ static void uv_init_per_cpu(int nuvhubs) { - int i, j, k; + int i; int cpu; int pnode; int uvhub; short socket = 0; + unsigned short socket_mask; + unsigned int uvhub_mask; struct bau_control *bcp; struct uvhub_desc *bdp; struct socket_desc *sdp; @@ -1562,7 +1564,7 @@ static void uv_init_per_cpu(int nuvhubs) short cpu_number[16]; }; struct uvhub_desc { - short num_sockets; + unsigned short socket_mask; short num_cpus; short uvhub; short pnode; @@ -1581,43 +1583,54 @@ static void uv_init_per_cpu(int nuvhubs) spin_lock_init(&bcp->masks_lock); pnode = uv_cpu_hub_info(cpu)->pnode; uvhub = uv_cpu_hub_info(cpu)->numa_blade_id; + uvhub_mask |= (1 << uvhub); bdp = &uvhub_descs[uvhub]; bdp->num_cpus++; bdp->uvhub = uvhub; bdp->pnode = pnode; - /* kludge: assume uv_hub.h is constant */ - socket = (cpu_physical_id(cpu)>>5)&1; - if (socket >= bdp->num_sockets) - bdp->num_sockets = socket+1; + /* kludge: 'assuming' one node per socket, and assuming that + disabling a socket just leaves a gap in node numbers */ + socket = (cpu_to_node(cpu) & 1);; + bdp->socket_mask |= (1 << socket); sdp = &bdp->socket[socket]; sdp->cpu_number[sdp->num_cpus] = cpu; sdp->num_cpus++; } - socket = 0; - for_each_possible_blade(uvhub) { + uvhub = 0; + while (uvhub_mask) { + if (!(uvhub_mask & 1)) + goto nexthub; bdp = &uvhub_descs[uvhub]; - for (i = 0; i < bdp->num_sockets; i++) { - sdp = &bdp->socket[i]; - for (j = 0; j < sdp->num_cpus; j++) { - cpu = sdp->cpu_number[j]; + socket_mask = bdp->socket_mask; + socket = 0; + while (socket_mask) { + if (!(socket_mask & 1)) + goto nextsocket; + sdp = &bdp->socket[socket]; + for (i = 0; i < sdp->num_cpus; i++) { + cpu = sdp->cpu_number[i]; bcp = &per_cpu(bau_control, cpu); bcp->cpu = cpu; - if (j == 0) { + if (i == 0) { smaster = bcp; - if (i == 0) + if (socket == 0) hmaster = bcp; } bcp->cpus_in_uvhub = bdp->num_cpus; bcp->cpus_in_socket = sdp->num_cpus; bcp->socket_master = smaster; + bcp->uvhub = bdp->uvhub; bcp->uvhub_master = hmaster; - for (k = 0; k < DEST_Q_SIZE; k++) - bcp->socket_acknowledge_count[k] = 0; - bcp->uvhub_cpu = - uv_cpu_hub_info(cpu)->blade_processor_id; + bcp->uvhub_cpu = uv_cpu_hub_info(cpu)-> + blade_processor_id; } +nextsocket: socket++; + socket_mask = (socket_mask >> 1); } +nexthub: + uvhub++; + uvhub_mask = (uvhub_mask >> 1); } kfree(uvhub_descs); for_each_present_cpu(cpu) { -- 2.34.1