From 295124dce4ddfd40b1f12d3ffd2779673e87c701 Mon Sep 17 00:00:00 2001 From: Grant Grundler Date: Tue, 17 Aug 2010 10:56:53 -0700 Subject: [libata] support for > 512 byte sectors (e.g. 4K Native) This change enables my x86 machine to recognize and talk to a "Native 4K" SATA device. When I started working on this, I didn't know Matthew Wilcox had posted a similar patch 2 years ago: http://git.kernel.org/?p=linux/kernel/git/willy/ata.git;a=shortlog;h=refs/heads/ata-large-sectors Gwendal Grignou pointed me at the the above code and small portions of this patch include Matthew's work. That's why Mathew is first on the "Signed-off-by:". I've NOT included his use of a bitmap to determine 512 vs Native for ATA command block size - just used a simple table. And bugs are almost certainly mine. Lastly, the patch has been tested with a native 4K 'Engineering Sample' drive provided by Hitachi GST. Signed-off-by: Matthew Wilcox Signed-off-by: Grant Grundler Reviewed-by: Gwendal Grignou Signed-off-by: Jeff Garzik --- include/linux/ata.h | 46 ++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 40 insertions(+), 6 deletions(-) (limited to 'include/linux/ata.h') diff --git a/include/linux/ata.h b/include/linux/ata.h index fe6e681a9d74..0c4929fa34d3 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -89,6 +89,7 @@ enum { ATA_ID_SPG = 98, ATA_ID_LBA_CAPACITY_2 = 100, ATA_ID_SECTOR_SIZE = 106, + ATA_ID_LOGICAL_SECTOR_SIZE = 117, /* and 118 */ ATA_ID_LAST_LUN = 126, ATA_ID_DLF = 128, ATA_ID_CSFO = 129, @@ -640,16 +641,49 @@ static inline int ata_id_flush_ext_enabled(const u16 *id) return (id[ATA_ID_CFS_ENABLE_2] & 0x2400) == 0x2400; } -static inline int ata_id_has_large_logical_sectors(const u16 *id) +static inline u32 ata_id_logical_sector_size(const u16 *id) { - if ((id[ATA_ID_SECTOR_SIZE] & 0xc000) != 0x4000) - return 0; - return id[ATA_ID_SECTOR_SIZE] & (1 << 13); + /* T13/1699-D Revision 6a, Sep 6, 2008. Page 128. + * IDENTIFY DEVICE data, word 117-118. + * 0xd000 ignores bit 13 (logical:physical > 1) + */ + if ((id[ATA_ID_SECTOR_SIZE] & 0xd000) == 0x5000) + return (((id[ATA_ID_LOGICAL_SECTOR_SIZE+1] << 16) + + id[ATA_ID_LOGICAL_SECTOR_SIZE]) * sizeof(u16)) ; + return ATA_SECT_SIZE; +} + +static inline u8 ata_id_log2_per_physical_sector(const u16 *id) +{ + /* T13/1699-D Revision 6a, Sep 6, 2008. Page 128. + * IDENTIFY DEVICE data, word 106. + * 0xe000 ignores bit 12 (logical sector > 512 bytes) + */ + if ((id[ATA_ID_SECTOR_SIZE] & 0xe000) == 0x6000) + return (id[ATA_ID_SECTOR_SIZE] & 0xf); + return 0; } -static inline u16 ata_id_logical_per_physical_sectors(const u16 *id) +/* Offset of logical sectors relative to physical sectors. + * + * If device has more than one logical sector per physical sector + * (aka 512 byte emulation), vendors might offset the "sector 0" address + * so sector 63 is "naturally aligned" - e.g. FAT partition table. + * This avoids Read/Mod/Write penalties when using FAT partition table + * and updating "well aligned" (FS perspective) physical sectors on every + * transaction. + */ +static inline u16 ata_id_logical_sector_offset(const u16 *id, + u8 log2_per_phys) { - return 1 << (id[ATA_ID_SECTOR_SIZE] & 0xf); + u16 word_209 = id[209]; + + if ((log2_per_phys > 1) && (word_209 & 0xc000) == 0x4000) { + u16 first = word_209 & 0x3fff; + if (first > 0) + return (1 << log2_per_phys) - first; + } + return 0; } static inline int ata_id_has_lba48(const u16 *id) -- cgit v1.2.1