ahci: add a module parameter to ignore the SSS flags for async scanning (f3d7f23f) · Commits · 戴 / test

The SSS flag, which directs the OS to spin up one disk at a time to not have the PSU blow out, sometimes gets set even when not needed. The effect of this is a longer-than-needed boot time. This patch adds a module parameter that makes the driver ignore SSS at least as far as the parallel scan during boot is concerned... Signed-off-by:

Arjan van de Ven <arjan@linux.intel.com> Signed-off-by:

Jeff Garzik <jgarzik@redhat.com>

drivers/ata/ahci.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -61,9 +61,14 @@
		#define EM_MSG_LED_VALUE_ON 0x00010000

		static int ahci_skip_host_reset;
		static int ahci_ignore_sss;

		module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
		MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");

		module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
		MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");

		static int ahci_enable_alpm(struct ata_port *ap,
		enum link_pm policy);
		static void ahci_disable_alpm(struct ata_port *ap);
		@@ -2692,8 +2697,10 @@ static int ahci_init_one(struct pci_dev pdev, const struct pci_device_id ent)
		host->iomap = pcim_iomap_table(pdev);
		host->private_data = hpriv;

		if (!(hpriv->cap & HOST_CAP_SSS))
		if (!(hpriv->cap & HOST_CAP_SSS) \|\| ahci_ignore_sss)
		host->flags \|= ATA_HOST_PARALLEL_SCAN;
		else
		printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");

		if (pi.flags & ATA_FLAG_EM)
		ahci_reset_em(host);

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