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OpenCloudOS-Kernel
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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 <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNy-0004aW-9S@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cliff Wickman 2010-06-02 16:22:02 -05:00 committed by Ingo Molnar
parent 39847e7f3c
commit a8328ee58c
1 changed files with 31 additions and 18 deletions
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49
arch/x86/kernel/tlb_uv.c
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@ -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) {