Re: [PATCH linux-2.6-block:master 09/10] blk: add FUA support to IDE

Tejun Heo
2005-07-26T17:03:16Z

09_blk_ide-add-fua-support.patch

Add FUA support to IDE

Signed-off-by: Tejun Heo <htejun@gmail.com>

drivers/ide/ide-disk.c | 57 +++++++++++++++++++++++++++++++++++++++++--------
include/linux/ata.h | 1
include/linux/hdreg.h | 16 ++++++++++++-
include/linux/ide.h | 3 ++
4 files changed, 66 insertions(+), 11 deletions(-)

Index: blk-fixes/drivers/ide/ide-disk.c
===================================================================
--- blk-fixes.orig/drivers/ide/ide-disk.c 2005-07-27 00:44:52.000000000 +0900
+++ blk-fixes/drivers/ide/ide-disk.c 2005-07-27 00:44:52.000000000 +0900
@@ -160,13 +160,14 @@ static ide_startstop_t __ide_do_rw_disk(
ide_hwif_t *hwif = HWIF(drive);
unsigned int dma = drive->using_dma;
u8 lba48 = (drive->addressing == 1) ? 1 : 0;
+ int fua = blk_fua_rq(rq);
task_ioreg_t command = WIN_NOP;
ata_nsector_t nsectors;

nsectors.all = (u16) rq->nr_sectors;

if (hwif->no_lba48_dma && lba48 && dma) {
- if (block + rq->nr_sectors > 1ULL << 28)
+ if (block + rq->nr_sectors > 1ULL << 28 || fua)
dma = 0;
else
lba48 = 0;
@@ -222,6 +223,16 @@ static ide_startstop_t __ide_do_rw_disk(
hwif->OUTB(tasklets[6], IDE_HCYL_REG);
hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
} else {
+ if (unlikely(fua)) {
+ /*
+ * This happens if LBA48 addressing is
+ * turned off during operation.
+ */
+ printk(KERN_ERR "%s: FUA write but LBA48 off\n",
+ drive->name);
+ goto fail;
+ }
+
hwif->OUTB(0x00, IDE_FEATURE_REG);
hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
hwif->OUTB(block, IDE_SECTOR_REG);
@@ -249,9 +260,12 @@ static ide_startstop_t __ide_do_rw_disk(
if (dma) {
if (!hwif->dma_setup(drive)) {
if (rq_data_dir(rq)) {
- command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
- if (drive->vdma)
- command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
+ if (!fua) {
+ command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
+ if (drive->vdma)
+ command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
+ } else
+ command = ATA_CMD_WRITE_FUA_EXT;
} else {
command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
if (drive->vdma)
@@ -280,8 +294,20 @@ static ide_startstop_t __ide_do_rw_disk(
} else {
if (drive->mult_count) {
hwif->data_phase = TASKFILE_MULTI_OUT;
- command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
+ if (!fua)
+ command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
+ else
+ command = ATA_CMD_MULT_WRITE_FUA_EXT;
} else {
+ if (unlikely(fua)) {
+ /*
+ * This happens if multisector PIO is
+ * turned off during operation.
+ */
+ printk(KERN_ERR "%s: FUA write but in single "
+ "sector PIO mode\n", drive->name);
+ goto fail;
+ }
hwif->data_phase = TASKFILE_OUT;
command = lba48 ? WIN_WRITE_EXT : WIN_WRITE;
}
@@ -291,6 +317,10 @@ static ide_startstop_t __ide_do_rw_disk(

return pre_task_out_intr(drive, rq);
}
+
+ fail:
+ ide_end_request(drive, 0, 0);
+ return ide_stopped;
}

/*
@@ -842,7 +872,7 @@ static void idedisk_setup (ide_drive_t *
{
struct hd_driveid *id = drive->id;
unsigned long long capacity;
- int barrier;
+ int barrier, fua;

idedisk_add_settings(drive);

@@ -963,10 +993,19 @@ static void idedisk_setup (ide_drive_t *
barrier = 0;
}

- printk(KERN_INFO "%s: cache flushes %ssupported\n",
- drive->name, barrier ? "" : "not ");
+ fua = barrier && idedisk_supports_lba48(id) && ide_id_has_fua(id);
+ /* When using PIO, FUA needs multisector. */
+ if ((!drive->using_dma || drive->hwif->no_lba48_dma) &&
+ drive->mult_count == 0)
+ fua = 0;
+
+ printk(KERN_INFO "%s: cache flushes %ssupported%s\n",
+ drive->name, barrier ? "" : "not ",
+ fua ? " w/ FUA" : "");
if (barrier) {
- blk_queue_ordered(drive->queue, QUEUE_ORDERED_DRAIN_FLUSH,
+ unsigned ordered = fua ? QUEUE_ORDERED_DRAIN_FUA
+ : QUEUE_ORDERED_DRAIN_FLUSH;
+ blk_queue_ordered(drive->queue, ordered,
idedisk_prepare_flush, GFP_KERNEL);
blk_queue_issue_flush_fn(drive->queue, idedisk_issue_flush);
} else if (!drive->wcache)
Index: blk-fixes/include/linux/ata.h
===================================================================
--- blk-fixes.orig/include/linux/ata.h 2005-07-27 00:44:52.000000000 +0900
+++ blk-fixes/include/linux/ata.h 2005-07-27 00:44:52.000000000 +0900
@@ -122,6 +122,7 @@ enum {
ATA_CMD_PIO_READ_EXT = 0x24,
ATA_CMD_PIO_WRITE = 0x30,
ATA_CMD_PIO_WRITE_EXT = 0x34,
+ ATA_CMD_MULT_WRITE_FUA_EXT = 0xCE,
ATA_CMD_SET_FEATURES = 0xEF,
ATA_CMD_PACKET = 0xA0,
ATA_CMD_VERIFY = 0x40,
Index: blk-fixes/include/linux/hdreg.h
===================================================================
--- blk-fixes.orig/include/linux/hdreg.h 2005-07-27 00:44:47.000000000 +0900
+++ blk-fixes/include/linux/hdreg.h 2005-07-27 00:44:52.000000000 +0900
@@ -550,7 +550,13 @@ struct hd_driveid {
* cmd set-feature supported extensions
* 15: Shall be ZERO
* 14: Shall be ONE
- * 13:6 reserved
+ * 13: IDLE IMMEDIATE w/ UNLOAD FEATURE
+ * 12:11 reserved for technical report
+ * 10: URG for WRITE STREAM
+ * 9: URG for READ STREAM
+ * 8: 64-bit World wide name
+ * 7: WRITE DMA QUEUED FUA EXT
+ * 6: WRITE DMA/MULTIPLE FUA EXT
* 5: General Purpose Logging
* 4: Streaming Feature Set
* 3: Media Card Pass Through
@@ -600,7 +606,13 @@ struct hd_driveid {
* command set-feature default
* 15: Shall be ZERO
* 14: Shall be ONE
- * 13:6 reserved
+ * 13: IDLE IMMEDIATE w/ UNLOAD FEATURE
+ * 12:11 reserved for technical report
+ * 10: URG for WRITE STREAM
+ * 9: URG for READ STREAM
+ * 8: 64-bit World wide name
+ * 7: WRITE DMA QUEUED FUA EXT
+ * 6: WRITE DMA/MULTIPLE FUA EXT
* 5: General Purpose Logging enabled
* 4: Valid CONFIGURE STREAM executed
* 3: Media Card Pass Through enabled
Index: blk-fixes/include/linux/ide.h
===================================================================
--- blk-fixes.orig/include/linux/ide.h 2005-07-27 00:44:47.000000000 +0900
+++ blk-fixes/include/linux/ide.h 2005-07-27 00:44:52.000000000 +0900
@@ -1497,6 +1497,9 @@ extern struct bus_type ide_bus_type;
/* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
#define ide_id_has_flush_cache(id) ((id)->cfs_enable_2 & 0x3000)

+/* check if WRITE DMA FUA EXT command is supported (defined in ATA-8) */
+#define ide_id_has_fua(id) ((id)->cfsse & 0x0040)
+
/* some Maxtor disks have bit 13 defined incorrectly so check bit 10 too */
#define ide_id_has_flush_cache_ext(id) \
(((id)->cfs_enable_2 & 0x2400) == 0x2400)