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libata: HPA support 

Signed-off-by: Alan Cox <alan@redhat.com>

Add support for ignoring the BIOS HPA result (off by default) and setting
the disk to the full available size unless already frozen.

Tested with various platforms/disks and confirmed to work with the
Macintosh (which broke earlier) and ata_piix (breakage due to the LBA48
readback that Tejun fixed).

For normal users this brings us, I believe, to feature parity with old IDE
(and of course more featured in some areas too).
Signed-off-by: Jeff Garzik <jeff@garzik.org>
hifive-unleashed-5.1
Alan Cox 2007-04-11 00:23:13 +01:00 committed by Jeff Garzik
parent 6bfff31e77
commit 1e999736ca
3 changed files with 212 additions and 0 deletions
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209
drivers/ata/libata-core.c
View File

@ -89,6 +89,10 @@ int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
static int ata_ignore_hpa = 0;
module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
module_param(ata_probe_timeout, int, 0444);
MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
@ -808,6 +812,202 @@ void ata_id_c_string(const u16 *id, unsigned char *s,
*p = '\0';
}
static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
{
u64 sectors = 0;
sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
sectors |= (tf->hob_lbal & 0xff) << 24;
sectors |= (tf->lbah & 0xff) << 16;
sectors |= (tf->lbam & 0xff) << 8;
sectors |= (tf->lbal & 0xff);
return ++sectors;
}
static u64 ata_tf_to_lba(struct ata_taskfile *tf)
{
u64 sectors = 0;
sectors |= (tf->device & 0x0f) << 24;
sectors |= (tf->lbah & 0xff) << 16;
sectors |= (tf->lbam & 0xff) << 8;
sectors |= (tf->lbal & 0xff);
return ++sectors;
}
/**
* ata_read_native_max_address_ext - LBA48 native max query
* @dev: Device to query
*
* Perform an LBA48 size query upon the device in question. Return the
* actual LBA48 size or zero if the command fails.
*/
static u64 ata_read_native_max_address_ext(struct ata_device *dev)
{
unsigned int err;
struct ata_taskfile tf;
ata_tf_init(dev, &tf);
tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
tf.protocol |= ATA_PROT_NODATA;
tf.device |= 0x40;
err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
if (err)
return 0;
return ata_tf_to_lba48(&tf);
}
/**
* ata_read_native_max_address - LBA28 native max query
* @dev: Device to query
*
* Performa an LBA28 size query upon the device in question. Return the
* actual LBA28 size or zero if the command fails.
*/
static u64 ata_read_native_max_address(struct ata_device *dev)
{
unsigned int err;
struct ata_taskfile tf;
ata_tf_init(dev, &tf);
tf.command = ATA_CMD_READ_NATIVE_MAX;
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
tf.protocol |= ATA_PROT_NODATA;
tf.device |= 0x40;
err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
if (err)
return 0;
return ata_tf_to_lba(&tf);
}
/**
* ata_set_native_max_address_ext - LBA48 native max set
* @dev: Device to query
*
* Perform an LBA48 size set max upon the device in question. Return the
* actual LBA48 size or zero if the command fails.
*/
static u64 ata_set_native_max_address_ext(struct ata_device *dev, u64 new_sectors)
{
unsigned int err;
struct ata_taskfile tf;
new_sectors--;
ata_tf_init(dev, &tf);
tf.command = ATA_CMD_SET_MAX_EXT;
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
tf.protocol |= ATA_PROT_NODATA;
tf.device |= 0x40;
tf.lbal = (new_sectors >> 0) & 0xff;
tf.lbam = (new_sectors >> 8) & 0xff;
tf.lbah = (new_sectors >> 16) & 0xff;
tf.hob_lbal = (new_sectors >> 24) & 0xff;
tf.hob_lbam = (new_sectors >> 32) & 0xff;
tf.hob_lbah = (new_sectors >> 40) & 0xff;
err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
if (err)
return 0;
return ata_tf_to_lba48(&tf);
}
/**
* ata_set_native_max_address - LBA28 native max set
* @dev: Device to query
*
* Perform an LBA28 size set max upon the device in question. Return the
* actual LBA28 size or zero if the command fails.
*/
static u64 ata_set_native_max_address(struct ata_device *dev, u64 new_sectors)
{
unsigned int err;
struct ata_taskfile tf;
new_sectors--;
ata_tf_init(dev, &tf);
tf.command = ATA_CMD_SET_MAX;
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
tf.protocol |= ATA_PROT_NODATA;
tf.lbal = (new_sectors >> 0) & 0xff;
tf.lbam = (new_sectors >> 8) & 0xff;
tf.lbah = (new_sectors >> 16) & 0xff;
tf.device |= ((new_sectors >> 24) & 0x0f) | 0x40;
err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
if (err)
return 0;
return ata_tf_to_lba(&tf);
}
/**
* ata_hpa_resize - Resize a device with an HPA set
* @dev: Device to resize
*
* Read the size of an LBA28 or LBA48 disk with HPA features and resize
* it if required to the full size of the media. The caller must check
* the drive has the HPA feature set enabled.
*/
static u64 ata_hpa_resize(struct ata_device *dev)
{
u64 sectors = dev->n_sectors;
u64 hpa_sectors;
if (ata_id_has_lba48(dev->id))
hpa_sectors = ata_read_native_max_address_ext(dev);
else
hpa_sectors = ata_read_native_max_address(dev);
/* if no hpa, both should be equal */
ata_dev_printk(dev, KERN_INFO, "%s 1: sectors = %lld, hpa_sectors = %lld\n",
__FUNCTION__, sectors, hpa_sectors);
if (hpa_sectors > sectors) {
ata_dev_printk(dev, KERN_INFO,
"Host Protected Area detected:\n"
"\tcurrent size: %lld sectors\n"
"\tnative size: %lld sectors\n",
sectors, hpa_sectors);
if (ata_ignore_hpa) {
if (ata_id_has_lba48(dev->id))
hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
else
hpa_sectors = ata_set_native_max_address(dev, hpa_sectors);
if (hpa_sectors) {
ata_dev_printk(dev, KERN_INFO,
"native size increased to %lld sectors\n", hpa_sectors);
return hpa_sectors;
}
}
}
return sectors;
}
static u64 ata_id_n_sectors(const u16 *id)
{
if (ata_id_has_lba(id)) {
@ -1662,6 +1862,7 @@ int ata_dev_configure(struct ata_device *dev)
snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
dev->n_sectors = ata_id_n_sectors(id);
dev->n_sectors_boot = dev->n_sectors;
/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
@ -1688,6 +1889,9 @@ int ata_dev_configure(struct ata_device *dev)
dev->flags |= ATA_DFLAG_FLUSH_EXT;
}
if (ata_id_hpa_enabled(dev->id))
dev->n_sectors = ata_hpa_resize(dev);
/* config NCQ */
ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
@ -3346,6 +3550,11 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
"%llu != %llu\n",
(unsigned long long)dev->n_sectors,
(unsigned long long)new_n_sectors);
/* Are we the boot time size - if so we appear to be the
same disk at this point and our HPA got reapplied */
if (ata_ignore_hpa && dev->n_sectors_boot == new_n_sectors
&& ata_id_hpa_enabled(new_id))
return 1;
return 0;
}

2
include/linux/ata.h
View File

@ -159,6 +159,8 @@ enum {
ATA_CMD_INIT_DEV_PARAMS = 0x91,
ATA_CMD_READ_NATIVE_MAX = 0xF8,
ATA_CMD_READ_NATIVE_MAX_EXT = 0x27,
ATA_CMD_SET_MAX = 0xF9,
ATA_CMD_SET_MAX_EXT = 0x37,
ATA_CMD_READ_LOG_EXT = 0x2f,
/* READ_LOG_EXT pages */

1
include/linux/libata.h
View File

@ -446,6 +446,7 @@ struct ata_device {
struct scsi_device *sdev; /* attached SCSI device */
/* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
u64 n_sectors; /* size of device, if ATA */
u64 n_sectors_boot; /* size of ATA device at startup */
unsigned int class; /* ATA_DEV_xxx */
u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
u8 pio_mode;