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libsas: remove task_collector mode

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The task_collector mode (or "latency_injector", (C) Dan Willians) is an
optional I/O path in libsas that queues up scsi commands instead of
directly sending it to the hardware.  It generall increases latencies
to in the optiomal case slightly reduce mmio traffic to the hardware.

Only the obsolete aic94xx driver and the mvsas driver allowed to use
it without recompiling the kernel, and most drivers didn't support it
at all.

Remove the giant blob of code to allow better optimizations for scsi-mq
in the future.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig
2014-11-05 10:36:28 +01:00
parent 309e7cc433
commit 79855d1785
20 changed files with 94 additions and 553 deletions
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22
drivers/scsi/mvsas/mv_init.c
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@@ -26,18 +26,9 @@
#include "mv_sas.h"
static int lldd_max_execute_num = 1;
module_param_named(collector, lldd_max_execute_num, int, S_IRUGO);
MODULE_PARM_DESC(collector, "\n"
"\tIf greater than one, tells the SAS Layer to run in Task Collector\n"
"\tMode. If 1 or 0, tells the SAS Layer to run in Direct Mode.\n"
"\tThe mvsas SAS LLDD supports both modes.\n"
"\tDefault: 1 (Direct Mode).\n");
int interrupt_coalescing = 0x80;
static struct scsi_transport_template *mvs_stt;
struct kmem_cache *mvs_task_list_cache;
static const struct mvs_chip_info mvs_chips[] = {
[chip_6320] = { 1, 2, 0x400, 17, 16, 6, 9, &mvs_64xx_dispatch, },
[chip_6440] = { 1, 4, 0x400, 17, 16, 6, 9, &mvs_64xx_dispatch, },
@@ -513,14 +504,11 @@ static void mvs_post_sas_ha_init(struct Scsi_Host *shost,
sha->num_phys = nr_core * chip_info->n_phy;
sha->lldd_max_execute_num = lldd_max_execute_num;
if (mvi->flags & MVF_FLAG_SOC)
can_queue = MVS_SOC_CAN_QUEUE;
else
can_queue = MVS_CHIP_SLOT_SZ;
sha->lldd_queue_size = can_queue;
shost->sg_tablesize = min_t(u16, SG_ALL, MVS_MAX_SG);
shost->can_queue = can_queue;
mvi->shost->cmd_per_lun = MVS_QUEUE_SIZE;
@@ -833,16 +821,7 @@ static int __init mvs_init(void)
if (!mvs_stt)
return -ENOMEM;
mvs_task_list_cache = kmem_cache_create("mvs_task_list", sizeof(struct mvs_task_list),
0, SLAB_HWCACHE_ALIGN, NULL);
if (!mvs_task_list_cache) {
rc = -ENOMEM;
mv_printk("%s: mvs_task_list_cache alloc failed! \n", __func__);
goto err_out;
}
rc = pci_register_driver(&mvs_pci_driver);
if (rc)
goto err_out;
@@ -857,7 +836,6 @@ static void __exit mvs_exit(void)
{
pci_unregister_driver(&mvs_pci_driver);
sas_release_transport(mvs_stt);
kmem_cache_destroy(mvs_task_list_cache);
}
struct device_attribute *mvst_host_attrs[] = {