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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
[SCSI] megaraid_sas: Add input parameter for max_sectors
Driver add the input parameters support for max_sectors for megaraid
sas gen2 chip. Customer can set the max_sectors support to 1MB for
gen2 chip during the driver load.
Signed-off-by Bo Yang <bo.yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
authored by Yang, Bo and committed by James Bottomley 1fd10685 837f5fe8
+30
drivers/scsi/megaraid/megaraid_sas.c
+30
drivers/scsi/megaraid/megaraid_sas.c
···
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MODULE_PARM_DESC(poll_mode_io,
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"Complete cmds from IO path, (default=0)");
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+
/*
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* Number of sectors per IO command
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* Will be set in megasas_init_mfi if user does not provide
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*/
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static unsigned int max_sectors;
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module_param_named(max_sectors, max_sectors, int, 0);
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MODULE_PARM_DESC(max_sectors,
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"Maximum number of sectors per IO command");
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+
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MODULE_LICENSE("GPL");
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MODULE_VERSION(MEGASAS_VERSION);
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MODULE_AUTHOR("megaraidlinux@lsi.com");
···
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instance->max_fw_cmds - MEGASAS_INT_CMDS;
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host->this_id = instance->init_id;
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host->sg_tablesize = instance->max_num_sge;
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+
/*
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* Check if the module parameter value for max_sectors can be used
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*/
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if (max_sectors && max_sectors < instance->max_sectors_per_req)
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instance->max_sectors_per_req = max_sectors;
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else {
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if (max_sectors) {
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if (((instance->pdev->device ==
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PCI_DEVICE_ID_LSI_SAS1078GEN2) ||
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(instance->pdev->device ==
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PCI_DEVICE_ID_LSI_SAS0079GEN2)) &&
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(max_sectors <= MEGASAS_MAX_SECTORS)) {
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instance->max_sectors_per_req = max_sectors;
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} else {
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printk(KERN_INFO "megasas: max_sectors should be > 0"
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"and <= %d (or < 1MB for GEN2 controller)\n",
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instance->max_sectors_per_req);
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}
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}
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}
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+
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host->max_sectors = instance->max_sectors_per_req;
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host->cmd_per_lun = 128;
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host->max_channel = MEGASAS_MAX_CHANNELS - 1;