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libata: Strict checking for identify reporting

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The ATA specifications require checks on certain flags before assuming
the validity of other data. Go through the methods and correct those
needing extra checks. Also note limits on ata_id_major_version with
respect to ATA-1 and ATA-2. Correct the 32bit PIO check.

Wants to sit in -mm for a bit in case of a screwup on my part that I
didn't hit on the test drives and also in case someone, somewhere has
a drive that gets it wrong.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2007-08-22 23:31:43 +01:00 committed by Jeff Garzik
parent 614fe29bd9
commit c7293870a9
1 changed files with 85 additions and 11 deletions
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96
include/linux/ata.h
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@ -347,22 +347,12 @@ struct ata_taskfile {
};
#define ata_id_is_ata(id) (((id)[0] & (1 << 15)) == 0)
#define ata_id_rahead_enabled(id) ((id)[85] & (1 << 6))
#define ata_id_wcache_enabled(id) ((id)[85] & (1 << 5))
#define ata_id_hpa_enabled(id) ((id)[85] & (1 << 10))
#define ata_id_has_fua(id) ((id)[84] & (1 << 6))
#define ata_id_has_flush(id) ((id)[83] & (1 << 12))
#define ata_id_has_flush_ext(id) ((id)[83] & (1 << 13))
#define ata_id_has_lba48(id) ((id)[83] & (1 << 10))
#define ata_id_has_hpa(id) ((id)[82] & (1 << 10))
#define ata_id_has_wcache(id) ((id)[82] & (1 << 5))
#define ata_id_has_pm(id) ((id)[82] & (1 << 3))
#define ata_id_has_lba(id) ((id)[49] & (1 << 9))
#define ata_id_has_dma(id) ((id)[49] & (1 << 8))
#define ata_id_has_ncq(id) ((id)[76] & (1 << 8))
#define ata_id_queue_depth(id) (((id)[75] & 0x1f) + 1)
#define ata_id_removeable(id) ((id)[0] & (1 << 7))
#define ata_id_has_dword_io(id) ((id)[50] & (1 << 0))
#define ata_id_has_dword_io(id) ((id)[48] & (1 << 0))
#define ata_id_has_AN(id) \
( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
((id)[78] & (1 << 5)) )
@ -378,6 +368,90 @@ struct ata_taskfile {
#define ata_id_cdb_intr(id) (((id)[0] & 0x60) == 0x20)
static inline int ata_id_has_fua(const u16 *id)
{
if ((id[84] & 0xC000) != 0x4000)
return 0;
return id[84] & (1 << 6);
}
static inline int ata_id_has_flush(const u16 *id)
{
if ((id[83] & 0xC000) != 0x4000)
return 0;
return id[83] & (1 << 12);
}
static inline int ata_id_has_flush_ext(const u16 *id)
{
if ((id[83] & 0xC000) != 0x4000)
return 0;
return id[83] & (1 << 13);
}
static inline int ata_id_has_lba48(const u16 *id)
{
if ((id[83] & 0xC000) != 0x4000)
return 0;
return id[83] & (1 << 10);
}
static inline int ata_id_hpa_enabled(const u16 *id)
{
/* Yes children, word 83 valid bits cover word 82 data */
if ((id[83] & 0xC000) != 0x4000)
return 0;
/* And 87 covers 85-87 */
if ((id[87] & 0xC000) != 0x4000)
return 0;
/* Check command sets enabled as well as supported */
if ((id[85] & ( 1 << 10)) == 0)
return 0;
return id[82] & (1 << 10);
}
static inline int ata_id_has_wcache(const u16 *id)
{
/* Yes children, word 83 valid bits cover word 82 data */
if ((id[83] & 0xC000) != 0x4000)
return 0;
return id[82] & (1 << 5);
}
static inline int ata_id_has_pm(const u16 *id)
{
if ((id[83] & 0xC000) != 0x4000)
return 0;
return id[82] & (1 << 3);
}
static inline int ata_id_rahead_enabled(const u16 *id)
{
if ((id[87] & 0xC000) != 0x4000)
return 0;
return id[85] & (1 << 6);
}
static inline int ata_id_wcache_enabled(const u16 *id)
{
if ((id[87] & 0xC000) != 0x4000)
return 0;
return id[85] & (1 << 5);
}
/**
* ata_id_major_version - get ATA level of drive
* @id: Identify data
*
* Caveats:
* ATA-1 considers identify optional
* ATA-2 introduces mandatory identify
* ATA-3 introduces word 80 and accurate reporting
*
* The practical impact of this is that ata_id_major_version cannot
* reliably report on drives below ATA3.
*/
static inline unsigned int ata_id_major_version(const u16 *id)
{
unsigned int mver;