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Date: Tue, 19 Aug 2014 14:29:41 +0800
From: Ching Huang <ching2048@...ca.com.tw>
To: hch@...radead.org, jbottomley@...allels.com,
dan.carpenter@...cle.com, thenzl@...hat.com, agordeev@...hat.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/17] arcmsr: limit max. number of SCSI command request
From: Ching Huang <ching2048@...ca.com.tw>
This patch limits the max. number of SCSI commmand request to avoid command overflow.
Signed-off-by: Ching Huang <ching2048@...ca.com.tw>
---
diff -uprN a/drivers/scsi/arcmsr/arcmsr.h b/drivers/scsi/arcmsr/arcmsr.h
--- a/drivers/scsi/arcmsr/arcmsr.h 2014-05-06 15:24:06.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr.h 2014-05-06 15:22:36.000000000 +0800
@@ -45,11 +45,12 @@
#include <linux/interrupt.h>
struct device_attribute;
/*The limit of outstanding scsi command that firmware can handle*/
-#define ARCMSR_MAX_OUTSTANDING_CMD 256
#ifdef CONFIG_XEN
#define ARCMSR_MAX_FREECCB_NUM 160
+#define ARCMSR_MAX_OUTSTANDING_CMD 155
#else
#define ARCMSR_MAX_FREECCB_NUM 320
+#define ARCMSR_MAX_OUTSTANDING_CMD 255
#endif
#define ARCMSR_DRIVER_VERSION "v1.30.00.04-20140428"
#define ARCMSR_SCSI_INITIATOR_ID 255
@@ -598,6 +599,7 @@ struct AdapterControlBlock
#define FW_DEADLOCK 0x0010
atomic_t rq_map_token;
atomic_t ante_token_value;
+ uint32_t maxOutstanding;
int msix_vector_count;
};/* HW_DEVICE_EXTENSION */
/*
diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
--- a/drivers/scsi/arcmsr/arcmsr_hba.c 2014-08-08 19:03:48.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2014-08-08 19:35:46.000000000 +0800
@@ -134,7 +134,7 @@ static struct scsi_host_template arcmsr_
.eh_bus_reset_handler = arcmsr_bus_reset,
.bios_param = arcmsr_bios_param,
.change_queue_depth = arcmsr_adjust_disk_queue_depth,
- .can_queue = ARCMSR_MAX_FREECCB_NUM,
+ .can_queue = ARCMSR_MAX_OUTSTANDING_CMD,
.this_id = ARCMSR_SCSI_INITIATOR_ID,
.sg_tablesize = ARCMSR_DEFAULT_SG_ENTRIES,
.max_sectors = ARCMSR_MAX_XFER_SECTORS_C,
@@ -693,7 +693,7 @@ static int arcmsr_probe(struct pci_dev *
host->max_lun = ARCMSR_MAX_TARGETLUN;
host->max_id = ARCMSR_MAX_TARGETID; /*16:8*/
host->max_cmd_len = 16; /*this is issue of 64bit LBA ,over 2T byte*/
- host->can_queue = ARCMSR_MAX_FREECCB_NUM; /* max simultaneous cmds */
+ host->can_queue = ARCMSR_MAX_OUTSTANDING_CMD; /* max simultaneous cmds */
host->cmd_per_lun = ARCMSR_MAX_CMD_PERLUN;
host->this_id = ARCMSR_SCSI_INITIATOR_ID;
host->unique_id = (bus << 8) | dev_fun;
@@ -2215,9 +2215,6 @@ static int arcmsr_queue_command_lck(stru
arcmsr_handle_virtual_command(acb, cmd);
return 0;
}
- if (atomic_read(&acb->ccboutstandingcount) >=
- ARCMSR_MAX_OUTSTANDING_CMD)
- return SCSI_MLQUEUE_HOST_BUSY;
ccb = arcmsr_get_freeccb(acb);
if (!ccb)
return SCSI_MLQUEUE_HOST_BUSY;
@@ -2427,12 +2424,27 @@ static bool arcmsr_get_hbc_config(struct
}
static bool arcmsr_get_firmware_spec(struct AdapterControlBlock *acb)
{
- if (acb->adapter_type == ACB_ADAPTER_TYPE_A)
- return arcmsr_get_hba_config(acb);
- else if (acb->adapter_type == ACB_ADAPTER_TYPE_B)
- return arcmsr_get_hbb_config(acb);
+ bool rtn = false;
+
+ switch (acb->adapter_type) {
+ case ACB_ADAPTER_TYPE_A:
+ rtn = arcmsr_get_hba_config(acb);
+ break;
+ case ACB_ADAPTER_TYPE_B:
+ rtn = arcmsr_get_hbb_config(acb);
+ break;
+ case ACB_ADAPTER_TYPE_C:
+ rtn = arcmsr_get_hbc_config(acb);
+ break;
+ default:
+ break;
+ }
+ if(acb->firm_numbers_queue > ARCMSR_MAX_OUTSTANDING_CMD)
+ acb->maxOutstanding = ARCMSR_MAX_OUTSTANDING_CMD;
else
- return arcmsr_get_hbc_config(acb);
+ acb->maxOutstanding = acb->firm_numbers_queue - 1;
+ acb->host->can_queue = acb->maxOutstanding;
+ return rtn;
}
static int arcmsr_polling_hba_ccbdone(struct AdapterControlBlock *acb,
--
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