Fix crash on driver load due to cpu affinity logic
Signed-off-by: James Smart <james.smart@xxxxxxxxxx>
---
lpfc_attr.c | 5 ++++-
lpfc_init.c | 28 +++++++++++++++++++++++-----
2 files changed, 27 insertions(+), 6 deletions(-)
diff -upNr a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
--- a/drivers/scsi/lpfc/lpfc_attr.c 2013-09-06 10:58:19.799132439 -0400
+++ b/drivers/scsi/lpfc/lpfc_attr.c 2013-09-06 10:58:46.749133052 -0400
@@ -4013,8 +4013,11 @@ LPFC_ATTR_R(ack0, 0, 0, 1, "Enable ACK0
# For [0], FCP commands are issued to Work Queues ina round robin fashion.
# For [1], FCP commands are issued to a Work Queue associated with the
# current CPU.
+# It would be set to 1 by the driver if it's able to set up cpu affinity
+# for FCP I/Os through Work Queue associated with the current CPU. Otherwise,
+# roundrobin scheduling of FCP I/Os through WQs will be used.
*/
-LPFC_ATTR_RW(fcp_io_sched, 0, 0, 1, "Determine scheduling algrithmn for "
+LPFC_ATTR_RW(fcp_io_sched, 0, 0, 1, "Determine scheduling algorithm for "
"issuing commands [0] - Round Robin, [1] - Current CPU");
/*
diff -upNr a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
--- a/drivers/scsi/lpfc/lpfc_init.c 2013-09-06 10:58:19.639132435 -0400
+++ b/drivers/scsi/lpfc/lpfc_init.c 2013-09-06 10:58:46.769133053 -0400
@@ -8399,7 +8399,8 @@ static int
lpfc_sli4_set_affinity(struct lpfc_hba *phba, int vectors)
{
int i, idx, saved_chann, used_chann, cpu, phys_id;
- int max_phys_id, num_io_channel, first_cpu;
+ int max_phys_id, min_phys_id;
+ int num_io_channel, first_cpu, chan;
struct lpfc_vector_map_info *cpup;
#ifdef CONFIG_X86
struct cpuinfo_x86 *cpuinfo;
@@ -8417,6 +8418,7 @@ lpfc_sli4_set_affinity(struct lpfc_hba *
phba->sli4_hba.num_present_cpu));
max_phys_id = 0;
+ min_phys_id = 0xff;
phys_id = 0;
num_io_channel = 0;
first_cpu = LPFC_VECTOR_MAP_EMPTY;
@@ -8440,9 +8442,12 @@ lpfc_sli4_set_affinity(struct lpfc_hba *
if (cpup->phys_id > max_phys_id)
max_phys_id = cpup->phys_id;
+ if (cpup->phys_id < min_phys_id)
+ min_phys_id = cpup->phys_id;
cpup++;
}
+ phys_id = min_phys_id;
/* Now associate the HBA vectors with specific CPUs */
for (idx = 0; idx < vectors; idx++) {
cpup = phba->sli4_hba.cpu_map;
@@ -8453,13 +8458,25 @@ lpfc_sli4_set_affinity(struct lpfc_hba *
for (i = 1; i < max_phys_id; i++) {
phys_id++;
if (phys_id > max_phys_id)
- phys_id = 0;
+ phys_id = min_phys_id;
cpu = lpfc_find_next_cpu(phba, phys_id);
if (cpu == LPFC_VECTOR_MAP_EMPTY)
continue;
goto found;
}
+ /* Use round robin for scheduling */
+ phba->cfg_fcp_io_sched = LPFC_FCP_SCHED_ROUND_ROBIN;
+ chan = 0;
+ cpup = phba->sli4_hba.cpu_map;
+ for (i = 0; i < phba->sli4_hba.num_present_cpu; i++) {
+ cpup->channel_id = chan;
+ cpup++;
+ chan++;
+ if (chan >= phba->cfg_fcp_io_channel)
+ chan = 0;
+ }
+
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"3329 Cannot set affinity:"
"Error mapping vector %d (%d)\n",
@@ -8497,7 +8514,7 @@ found:
/* Spread vector mapping across multple physical CPU nodes */
phys_id++;
if (phys_id > max_phys_id)
- phys_id = 0;
+ phys_id = min_phys_id;
}
/*
@@ -8507,7 +8524,7 @@ found:
* Base the remaining IO channel assigned, to IO channels already
* assigned to other CPUs on the same phys_id.
*/
- for (i = 0; i <= max_phys_id; i++) {
+ for (i = min_phys_id; i <= max_phys_id; i++) {
/*
* If there are no io channels already mapped to
* this phys_id, just round robin thru the io_channels.
@@ -8589,10 +8606,11 @@ out:
if (num_io_channel != phba->sli4_hba.num_present_cpu)
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"3333 Set affinity mismatch:"
- "%d chann != %d cpus: %d vactors\n",
+ "%d chann != %d cpus: %d vectors\n",
num_io_channel, phba->sli4_hba.num_present_cpu,
vectors);
+ /* Enable using cpu affinity for scheduling */
phba->cfg_fcp_io_sched = LPFC_FCP_SCHED_BY_CPU;
return 1;
}
--
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