07_blk_libata-add-fua-support.patch
Add FUA support to libata.
Signed-off-by: Tejun Heo <[email protected]>
drivers/scsi/libata-core.c | 14 +++++++++-----
drivers/scsi/libata-scsi.c | 26 ++++++++++++++++++++++++--
include/linux/ata.h | 4 +++-
include/linux/libata.h | 1 +
4 files changed, 37 insertions(+), 8 deletions(-)
Index: blk-fixes/drivers/scsi/libata-core.c
===================================================================
--- blk-fixes.orig/drivers/scsi/libata-core.c 2005-07-27 00:44:48.000000000 +0900
+++ blk-fixes/drivers/scsi/libata-core.c 2005-07-27 00:44:52.000000000 +0900
@@ -602,19 +602,21 @@ void ata_tf_from_fis(u8 *fis, struct ata
}
/**
- * ata_prot_to_cmd - determine which read/write opcodes to use
+ * ata_prot_to_cmd - determine which read/write/fua-write opcodes to use
* @protocol: ATA_PROT_xxx taskfile protocol
* @lba48: true is lba48 is present
*
- * Given necessary input, determine which read/write commands
- * to use to transfer data.
+ * Given necessary input, determine which read/write/fua-write
+ * commands to use to transfer data. Note that we only support
+ * fua-writes on DMA LBA48 protocol. In other cases, we simply
+ * return 0 which is NOP.
*
* LOCKING:
* None.
*/
static int ata_prot_to_cmd(int protocol, int lba48)
{
- int rcmd = 0, wcmd = 0;
+ int rcmd = 0, wcmd = 0, wfua = 0;
switch (protocol) {
case ATA_PROT_PIO:
@@ -631,6 +633,7 @@ static int ata_prot_to_cmd(int protocol,
if (lba48) {
rcmd = ATA_CMD_READ_EXT;
wcmd = ATA_CMD_WRITE_EXT;
+ wfua = ATA_CMD_WRITE_FUA_EXT;
} else {
rcmd = ATA_CMD_READ;
wcmd = ATA_CMD_WRITE;
@@ -641,7 +644,7 @@ static int ata_prot_to_cmd(int protocol,
return -1;
}
- return rcmd | (wcmd << 8);
+ return rcmd | (wcmd << 8) | (wfua << 16);
}
/**
@@ -674,6 +677,7 @@ static void ata_dev_set_protocol(struct
dev->read_cmd = cmd & 0xff;
dev->write_cmd = (cmd >> 8) & 0xff;
+ dev->write_fua_cmd = (cmd >> 16) & 0xff;
}
static const char * xfer_mode_str[] = {
Index: blk-fixes/include/linux/ata.h
===================================================================
--- blk-fixes.orig/include/linux/ata.h 2005-07-27 00:44:48.000000000 +0900
+++ blk-fixes/include/linux/ata.h 2005-07-27 00:44:52.000000000 +0900
@@ -117,6 +117,7 @@ enum {
ATA_CMD_READ_EXT = 0x25,
ATA_CMD_WRITE = 0xCA,
ATA_CMD_WRITE_EXT = 0x35,
+ ATA_CMD_WRITE_FUA_EXT = 0x3D,
ATA_CMD_PIO_READ = 0x20,
ATA_CMD_PIO_READ_EXT = 0x24,
ATA_CMD_PIO_WRITE = 0x30,
@@ -227,7 +228,8 @@ struct ata_taskfile {
#define ata_id_is_sata(id) ((id)[93] == 0)
#define ata_id_rahead_enabled(id) ((id)[85] & (1 << 6))
#define ata_id_wcache_enabled(id) ((id)[85] & (1 << 5))
-#define ata_id_has_flush(id) ((id)[83] & (1 << 12))
+#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_wcache(id) ((id)[82] & (1 << 5))
Index: blk-fixes/include/linux/libata.h
===================================================================
--- blk-fixes.orig/include/linux/libata.h 2005-07-27 00:44:48.000000000 +0900
+++ blk-fixes/include/linux/libata.h 2005-07-27 00:44:52.000000000 +0900
@@ -278,6 +278,7 @@ struct ata_device {
u8 xfer_protocol; /* taskfile xfer protocol */
u8 read_cmd; /* opcode to use on read */
u8 write_cmd; /* opcode to use on write */
+ u8 write_fua_cmd; /* opcode to use on FUA write */
};
struct ata_port {
Index: blk-fixes/drivers/scsi/libata-scsi.c
===================================================================
--- blk-fixes.orig/drivers/scsi/libata-scsi.c 2005-07-27 00:44:48.000000000 +0900
+++ blk-fixes/drivers/scsi/libata-scsi.c 2005-07-27 00:44:52.000000000 +0900
@@ -537,6 +537,7 @@ static unsigned int ata_scsi_rw_xlat(str
{
struct ata_taskfile *tf = &qc->tf;
unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48;
+ int fua = scsicmd[1] & (1 << 3);
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->protocol = qc->dev->xfer_protocol;
@@ -544,9 +545,28 @@ static unsigned int ata_scsi_rw_xlat(str
if (scsicmd[0] == READ_10 || scsicmd[0] == READ_6 ||
scsicmd[0] == READ_16) {
- tf->command = qc->dev->read_cmd;
+ if (!fua) {
+ tf->command = qc->dev->read_cmd;
+ } else {
+ printk(KERN_WARNING
+ "ata%u(%u): WARNING: FUA READ unsupported\n",
+ qc->ap->id, qc->dev->devno);
+ return 1;
+ }
} else {
- tf->command = qc->dev->write_cmd;
+ if (!fua) {
+ tf->command = qc->dev->write_cmd;
+ } else {
+ if (qc->dev->write_fua_cmd == 0 || !lba48) {
+ printk(KERN_WARNING
+ "ata%u(%u): WARNING: FUA WRITE "
+ "unsupported with the current "
+ "protocol/addressing\n",
+ qc->ap->id, qc->dev->devno);
+ return 1;
+ }
+ tf->command = qc->dev->write_fua_cmd;
+ }
tf->flags |= ATA_TFLAG_WRITE;
}
@@ -1141,10 +1161,12 @@ unsigned int ata_scsiop_mode_sense(struc
if (six_byte) {
output_len--;
rbuf[0] = output_len;
+ rbuf[2] |= ata_id_has_fua(args->id) ? 1 << 4 : 0;
} else {
output_len -= 2;
rbuf[0] = output_len >> 8;
rbuf[1] = output_len;
+ rbuf[3] |= ata_id_has_fua(args->id) ? 1 << 4 : 0;
}
return 0;
-
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