ide: add "nodma|noflush|noprobe|nowerr=" parameters (6e87543a) · Commits · e / devices / android_kernel_fairphone_FP3

Documentation/ide/ide.txt

+13 −13

Original line number	Diff line number	Diff line
		@@ -99,10 +99,10 @@ with hd.c but not with ide.c), then an command line option may be specified
		for each drive for which you'd like the drive to skip the hardware
		probe/identification sequence. For example:

		hdb=noprobe
		ide_core.noprobe=0.1
		or
		hdc=768,16,32
		hdc=noprobe
		ide_core.noprobe=1.0

		Note that when only one IDE device is attached to an interface, it should be
		jumpered as "single" or "master", not "slave". Many folks have had
		@@ -174,9 +174,7 @@ to /etc/modprobe.conf.

		When ide.c is used as a module, you can pass command line parameters to the
		driver using the "options=" keyword to insmod, while replacing any ',' with
		';'. For example:

		insmod ide.o options="hda=nodma hdb=nodma"
		';'.


		================================================================================
		@@ -186,18 +184,10 @@ Summary of ide driver parameters for kernel command line

		"hdx=" is recognized for all "x" from "a" to "u", such as "hdc".

		"hdx=noprobe" : drive may be present, but do not probe for it

		"hdx=none" : drive is NOT present, ignore cmos and do not probe

		"hdx=nowerr" : ignore the WRERR_STAT bit on this drive

		"hdx=cdrom" : drive is present, and is a cdrom drive

		"hdx=cyl,head,sect" : disk drive is present, with specified geometry

		"hdx=nodma" : disallow DMA

		"ide=doubler" : probe/support IDE doublers on Amiga

		There may be more options than shown -- use the source, Luke!
		@@ -230,6 +220,16 @@ a case please report it as a bug instead) use "ignore_cable" kernel parameter:
		* "ignore_cable=[interface_number]" module parameter (for ide_core module)
		if IDE is compiled as module

		Other kernel parameters for ide_core are:

		* "nodma=[interface_number.device_number]" to disallow DMA for a device

		* "noflush=[interface_number.device_number]" to disable flush requests

		* "noprobe=[interface_number.device_number]" to skip probing

		* "nowerr=[interface_number.device_number]" to ignore the WRERR_STAT bit

		================================================================================

		Some Terminology

drivers/ide/ide.c

+75 −4

Original line number	Diff line number	Diff line
		@@ -915,10 +915,10 @@ static int __init ide_setup(char *s)
		case -1: /* "none" */
		case -2: /* "noprobe" */
		drive->noprobe = 1;
		goto done;
		goto obsolete_option;
		case -3: /* "nowerr" */
		drive->bad_wstat = BAD_R_STAT;
		goto done;
		goto obsolete_option;
		case -4: /* "cdrom" */
		drive->present = 1;
		drive->media = ide_cdrom;
		@@ -927,10 +927,10 @@ static int __init ide_setup(char *s)
		goto done;
		case -5: /* nodma */
		drive->nodma = 1;
		goto done;
		goto obsolete_option;
		case -11: /* noflush */
		drive->noflush = 1;
		goto done;
		goto obsolete_option;
		case -12: /* "remap" */
		drive->remap_0_to_1 = 1;
		goto obsolete_option;
		@@ -1125,6 +1125,72 @@ EXPORT_SYMBOL_GPL(ide_pci_clk);
		module_param_named(pci_clock, ide_pci_clk, int, 0);
		MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");

		static int ide_set_dev_param_mask(const char s, struct kernel_param kp)
		{
		int a, b, i, j = 1;
		unsigned int dev_param_mask = (unsigned int )kp->arg;

		if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
		sscanf(s, "%d.%d", &a, &b) != 2)
		return -EINVAL;

		i = a * MAX_DRIVES + b;

		if (i >= MAX_HWIFS * MAX_DRIVES \|\| j < 0 \|\| j > 1)
		return -EINVAL;

		if (j)
		*dev_param_mask \|= (1 << i);
		else
		*dev_param_mask &= (1 << i);

		return 0;
		}

		static unsigned int ide_nodma;

		module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
		MODULE_PARM_DESC(nodma, "disallow DMA for a device");

		static unsigned int ide_noflush;

		module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
		MODULE_PARM_DESC(noflush, "disable flush requests for a device");

		static unsigned int ide_noprobe;

		module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
		MODULE_PARM_DESC(noprobe, "skip probing for a device");

		static unsigned int ide_nowerr;

		module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
		MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");

		static void ide_dev_apply_params(ide_drive_t *drive)
		{
		int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;

		if (ide_nodma & (1 << i)) {
		printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
		drive->nodma = 1;
		}
		if (ide_noflush & (1 << i)) {
		printk(KERN_INFO "ide: disabling flush requests for %s\n",
		drive->name);
		drive->noflush = 1;
		}
		if (ide_noprobe & (1 << i)) {
		printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
		drive->noprobe = 1;
		}
		if (ide_nowerr & (1 << i)) {
		printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
		drive->name);
		drive->bad_wstat = BAD_R_STAT;
		}
		}

		static unsigned int ide_ignore_cable;

		static int ide_set_ignore_cable(const char s, struct kernel_param kp)
		@@ -1150,11 +1216,16 @@ MODULE_PARM_DESC(ignore_cable, "ignore cable detection");

		void ide_port_apply_params(ide_hwif_t *hwif)
		{
		int i;

		if (ide_ignore_cable & (1 << hwif->index)) {
		printk(KERN_INFO "ide: ignoring cable detection for %s\n",
		hwif->name);
		hwif->cbl = ATA_CBL_PATA40_SHORT;
		}

		for (i = 0; i < MAX_DRIVES; i++)
		ide_dev_apply_params(&hwif->drives[i]);
		}

		/*