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[SCSI] vmw_pvscsi: Some improvements in pvscsi driver.

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This change is about the following:
(1) If the number of targets is 16+ then default ring_pages to 32.
(2) Change default queue depth (per device) to 254.
(3) Implement change_queue_depth function so that queue_depth per device can
    be changed at run time. Honors the request only if coming from sysfs.
(4) Clean up the info returned by modinfo.

Signed-off-by: Arvind Kumar <arvindkumar@vmware.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Arvind Kumar 2014-03-08 13:04:45 -08:00 committed by James Bottomley
parent 2a815b5ac3
commit 0284556009
2 changed files with 105 additions and 39 deletions
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142
drivers/scsi/vmw_pvscsi.c
View File

@ -32,6 +32,7 @@
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include "vmw_pvscsi.h"
@ -44,7 +45,7 @@ MODULE_VERSION(PVSCSI_DRIVER_VERSION_STRING);
#define PVSCSI_DEFAULT_NUM_PAGES_PER_RING 8
#define PVSCSI_DEFAULT_NUM_PAGES_MSG_RING 1
#define PVSCSI_DEFAULT_QUEUE_DEPTH 64
#define PVSCSI_DEFAULT_QUEUE_DEPTH 254
#define SGL_SIZE PAGE_SIZE
struct pvscsi_sg_list {
@ -104,7 +105,7 @@ struct pvscsi_adapter {
/* Command line parameters */
static int pvscsi_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
static int pvscsi_ring_pages;
static int pvscsi_msg_ring_pages = PVSCSI_DEFAULT_NUM_PAGES_MSG_RING;
static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH;
static bool pvscsi_disable_msi;
@ -116,7 +117,10 @@ static bool pvscsi_use_req_threshold = true;
module_param_named(ring_pages, pvscsi_ring_pages, int, PVSCSI_RW);
MODULE_PARM_DESC(ring_pages, "Number of pages per req/cmp ring - (default="
__stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING) ")");
__stringify(PVSCSI_DEFAULT_NUM_PAGES_PER_RING)
"[up to 16 targets],"
__stringify(PVSCSI_SETUP_RINGS_MAX_NUM_PAGES)
"[for 16+ targets])");
module_param_named(msg_ring_pages, pvscsi_msg_ring_pages, int, PVSCSI_RW);
MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
@ -124,7 +128,7 @@ MODULE_PARM_DESC(msg_ring_pages, "Number of pages for the msg ring - (default="
module_param_named(cmd_per_lun, pvscsi_cmd_per_lun, int, PVSCSI_RW);
MODULE_PARM_DESC(cmd_per_lun, "Maximum commands per lun - (default="
__stringify(PVSCSI_MAX_REQ_QUEUE_DEPTH) ")");
__stringify(PVSCSI_DEFAULT_QUEUE_DEPTH) ")");
module_param_named(disable_msi, pvscsi_disable_msi, bool, PVSCSI_RW);
MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
@ -500,6 +504,35 @@ static void pvscsi_setup_all_rings(const struct pvscsi_adapter *adapter)
}
}
static int pvscsi_change_queue_depth(struct scsi_device *sdev,
int qdepth,
int reason)
{
int max_depth;
struct Scsi_Host *shost = sdev->host;
if (reason != SCSI_QDEPTH_DEFAULT)
/*
* We support only changing default.
*/
return -EOPNOTSUPP;
max_depth = shost->can_queue;
if (!sdev->tagged_supported)
max_depth = 1;
if (qdepth > max_depth)
qdepth = max_depth;
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
if (sdev->inquiry_len > 7)
sdev_printk(KERN_INFO, sdev,
"qdepth(%d), tagged(%d), simple(%d), ordered(%d), scsi_level(%d), cmd_que(%d)\n",
sdev->queue_depth, sdev->tagged_supported,
sdev->simple_tags, sdev->ordered_tags,
sdev->scsi_level, (sdev->inquiry[7] & 2) >> 1);
return sdev->queue_depth;
}
/*
* Pull a completion descriptor off and pass the completion back
* to the SCSI mid layer.
@ -965,6 +998,7 @@ static struct scsi_host_template pvscsi_template = {
.dma_boundary = UINT_MAX,
.max_sectors = 0xffff,
.use_clustering = ENABLE_CLUSTERING,
.change_queue_depth = pvscsi_change_queue_depth,
.eh_abort_handler = pvscsi_abort,
.eh_device_reset_handler = pvscsi_device_reset,
.eh_bus_reset_handler = pvscsi_bus_reset,
@ -1318,11 +1352,12 @@ exit:
static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct pvscsi_adapter *adapter;
struct Scsi_Host *host;
struct device *dev;
struct pvscsi_adapter adapter_temp;
struct Scsi_Host *host = NULL;
unsigned int i;
unsigned long flags = 0;
int error;
u32 max_id;
error = -ENODEV;
@ -1340,34 +1375,19 @@ static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto out_disable_device;
}
pvscsi_template.can_queue =
min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
pvscsi_template.cmd_per_lun =
min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
if (!host) {
printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
goto out_disable_device;
}
adapter = shost_priv(host);
/*
* Let's use a temp pvscsi_adapter struct until we find the number of
* targets on the adapter, after that we will switch to the real
* allocated struct.
*/
adapter = &adapter_temp;
memset(adapter, 0, sizeof(*adapter));
adapter->dev = pdev;
adapter->host = host;
spin_lock_init(&adapter->hw_lock);
host->max_channel = 0;
host->max_id = 16;
host->max_lun = 1;
host->max_cmd_len = 16;
adapter->rev = pdev->revision;
if (pci_request_regions(pdev, "vmw_pvscsi")) {
printk(KERN_ERR "vmw_pvscsi: pci memory selection failed\n");
goto out_free_host;
goto out_disable_device;
}
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
@ -1383,7 +1403,7 @@ static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (i == DEVICE_COUNT_RESOURCE) {
printk(KERN_ERR
"vmw_pvscsi: adapter has no suitable MMIO region\n");
goto out_release_resources;
goto out_release_resources_and_disable;
}
adapter->mmioBase = pci_iomap(pdev, i, PVSCSI_MEM_SPACE_SIZE);
@ -1392,10 +1412,60 @@ static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
printk(KERN_ERR
"vmw_pvscsi: can't iomap for BAR %d memsize %lu\n",
i, PVSCSI_MEM_SPACE_SIZE);
goto out_release_resources;
goto out_release_resources_and_disable;
}
pci_set_master(pdev);
/*
* Ask the device for max number of targets before deciding the
* default pvscsi_ring_pages value.
*/
max_id = pvscsi_get_max_targets(adapter);
printk(KERN_INFO "vmw_pvscsi: max_id: %u\n", max_id);
if (pvscsi_ring_pages == 0)
/*
* Set the right default value. Up to 16 it is 8, above it is
* max.
*/
pvscsi_ring_pages = (max_id > 16) ?
PVSCSI_SETUP_RINGS_MAX_NUM_PAGES :
PVSCSI_DEFAULT_NUM_PAGES_PER_RING;
printk(KERN_INFO
"vmw_pvscsi: setting ring_pages to %d\n",
pvscsi_ring_pages);
pvscsi_template.can_queue =
min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
pvscsi_template.cmd_per_lun =
min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
host = scsi_host_alloc(&pvscsi_template, sizeof(struct pvscsi_adapter));
if (!host) {
printk(KERN_ERR "vmw_pvscsi: failed to allocate host\n");
goto out_release_resources_and_disable;
}
/*
* Let's use the real pvscsi_adapter struct here onwards.
*/
adapter = shost_priv(host);
memset(adapter, 0, sizeof(*adapter));
adapter->dev = pdev;
adapter->host = host;
/*
* Copy back what we already have to the allocated adapter struct.
*/
adapter->rev = adapter_temp.rev;
adapter->mmioBase = adapter_temp.mmioBase;
spin_lock_init(&adapter->hw_lock);
host->max_channel = 0;
host->max_lun = 1;
host->max_cmd_len = 16;
host->max_id = max_id;
pci_set_drvdata(pdev, host);
ll_adapter_reset(adapter);
@ -1408,13 +1478,6 @@ static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto out_release_resources;
}
/*
* Ask the device for max number of targets.
*/
host->max_id = pvscsi_get_max_targets(adapter);
dev = pvscsi_dev(adapter);
dev_info(dev, "vmw_pvscsi: host->max_id: %u\n", host->max_id);
/*
* From this point on we should reset the adapter if anything goes
* wrong.
@ -1488,12 +1551,15 @@ out_reset_adapter:
ll_adapter_reset(adapter);
out_release_resources:
pvscsi_release_resources(adapter);
out_free_host:
scsi_host_put(host);
out_disable_device:
pci_disable_device(pdev);
return error;
out_release_resources_and_disable:
pvscsi_release_resources(adapter);
goto out_disable_device;
}
static void __pvscsi_shutdown(struct pvscsi_adapter *adapter)

2
drivers/scsi/vmw_pvscsi.h
View File

@ -26,7 +26,7 @@
#include <linux/types.h>
#define PVSCSI_DRIVER_VERSION_STRING "1.0.4.0-k"
#define PVSCSI_DRIVER_VERSION_STRING "1.0.5.0-k"
#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128