From: Kristen Carlson Accardi <[EMAIL PROTECTED]>
This patch series implements Asynchronous Notification (AN) for SATA ATAPI
devices as defined in SATA 2.5 and AHCI 1.1 and higher. Drives which support
this feature will send a notification when new media is inserted and removed,
preventing the need for user space to poll for new media. This support is
exposed to user space via a flag that will be set in
/sys/block/sr*/capability_flags. If the flag is set, user space can disable
polling for the new media, and the genhd driver will send a KOBJ_CHANGE event
with the envp set to MEDIA_CHANGE_EVENT=1.
Note that this patch only implements support for directly attached drives - AN
with drives attached to a port multiplier requires additional changes.
This patch:
Check to see if an ATAPI device supports Asynchronous Notification. If so,
enable it.
Signed-off-by: Kristen Carlson Accardi <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
drivers/ata/ahci.c | 5 ++-
drivers/ata/libata-core.c | 52 ++++++++++++++++++++++++++++++++++++
include/linux/ata.h | 9 ++++++
include/linux/libata.h | 2 +
4 files changed, 66 insertions(+), 2 deletions(-)
diff -puN drivers/ata/ahci.c~libata-check-for-an-support drivers/ata/ahci.c
--- a/drivers/ata/ahci.c~libata-check-for-an-support
+++ a/drivers/ata/ahci.c
@@ -325,14 +325,15 @@ static const struct ata_port_operations
static const struct ata_port_info ahci_port_info[] = {
/* board_ahci */
{
- .flags = AHCI_FLAG_COMMON,
+ .flags = AHCI_FLAG_COMMON | ATA_FLAG_AN,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
.port_ops = &ahci_ops,
},
/* board_ahci_pi */
{
- .flags = AHCI_FLAG_COMMON | AHCI_FLAG_HONOR_PI,
+ .flags = AHCI_FLAG_COMMON | AHCI_FLAG_HONOR_PI |
+ ATA_FLAG_AN,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
.port_ops = &ahci_ops,
diff -puN drivers/ata/libata-core.c~libata-check-for-an-support
drivers/ata/libata-core.c
--- a/drivers/ata/libata-core.c~libata-check-for-an-support
+++ a/drivers/ata/libata-core.c
@@ -71,6 +71,7 @@ const unsigned long sata_deb_timing_long
static unsigned int ata_dev_init_params(struct ata_device *dev,
u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
+static unsigned int ata_dev_set_AN(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
unsigned int ata_print_id = 1;
@@ -1964,6 +1965,22 @@ int ata_dev_configure(struct ata_device
}
dev->cdb_len = (unsigned int) rc;
+ /*
+ * check to see if this ATAPI device supports
+ * Asynchronous Notification
+ */
+ if ((ap->flags & ATA_FLAG_AN) && ata_id_has_AN(id)) {
+ int err;
+ /* issue SET feature command to turn this on */
+ err = ata_dev_set_AN(dev);
+ if (err)
+ ata_dev_printk(dev, KERN_ERR,
+ "unable to set AN, err %x\n",
+ err);
+ else
+ dev->flags |= ATA_DFLAG_AN;
+ }
+
if (ata_id_cdb_intr(dev->id)) {
dev->flags |= ATA_DFLAG_CDB_INTR;
cdb_intr_string = ", CDB intr";
@@ -3891,6 +3908,41 @@ static unsigned int ata_dev_set_xfermode
}
/**
+ * ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
+ * @dev: Device to which command will be sent
+ *
+ * Issue SET FEATURES - SATA FEATURES command to device @dev
+ * on port @ap with sector count set to indicate Asynchronous
+ * Notification feature
+ *
+ * LOCKING:
+ * PCI/etc. bus probe sem.
+ *
+ * RETURNS:
+ * 0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_set_AN(struct ata_device *dev)
+{
+ struct ata_taskfile tf;
+ unsigned int err_mask;
+
+ /* set up set-features taskfile */
+ DPRINTK("set features - SATA features\n");
+
+ ata_tf_init(dev, &tf);
+ tf.command = ATA_CMD_SET_FEATURES;
+ tf.feature = SETFEATURES_SATA_ENABLE;
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.protocol = ATA_PROT_NODATA;
+ tf.nsect = SATA_AN;
+
+ err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
+
+ DPRINTK("EXIT, err_mask=%x\n", err_mask);
+ return err_mask;
+}
+
+/**
* ata_dev_init_params - Issue INIT DEV PARAMS command
* @dev: Device to which command will be sent
* @heads: Number of heads (taskfile parameter)
diff -puN include/linux/ata.h~libata-check-for-an-support include/linux/ata.h
--- a/include/linux/ata.h~libata-check-for-an-support
+++ a/include/linux/ata.h
@@ -204,6 +204,12 @@ enum {
SETFEATURES_SPINUP = 0x07, /* Spin-up drive */
+ SETFEATURES_SATA_ENABLE = 0x10, /* Enable use of SATA feature */
+ SETFEATURES_SATA_DISABLE = 0x90, /* Disable use of SATA feature */
+
+ /* SETFEATURE Sector counts for SATA features */
+ SATA_AN = 0x05, /* Asynchronous Notification */
+
/* ATAPI stuff */
ATAPI_PKT_DMA = (1 << 0),
ATAPI_DMADIR = (1 << 2), /* ATAPI data dir:
@@ -309,6 +315,9 @@ struct ata_taskfile {
#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_AN(id) \
+ ( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
+ ((id)[78] & (1 << 5)) )
#define ata_id_iordy_disable(id) ((id)[49] & (1 << 10))
#define ata_id_has_iordy(id) ((id)[49] & (1 << 9))
#define ata_id_u32(id,n) \
diff -puN include/linux/libata.h~libata-check-for-an-support
include/linux/libata.h
--- a/include/linux/libata.h~libata-check-for-an-support
+++ a/include/linux/libata.h
@@ -136,6 +136,7 @@ enum {
ATA_DFLAG_CDB_INTR = (1 << 2), /* device asserts INTRQ when ready
for CDB */
ATA_DFLAG_NCQ = (1 << 3), /* device supports NCQ */
ATA_DFLAG_FLUSH_EXT = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
+ ATA_DFLAG_AN = (1 << 5), /* device supports Async
notification */
ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
@@ -173,6 +174,7 @@ enum {
ATA_FLAG_SETXFER_POLLING= (1 << 14), /* use polling for SETXFER */
ATA_FLAG_IGN_SIMPLEX = (1 << 15), /* ignore SIMPLEX */
ATA_FLAG_NO_IORDY = (1 << 16), /* controller lacks iordy */
+ ATA_FLAG_AN = (1 << 17), /* controller supports AN */
/* The following flag belongs to ap->pflags but is kept in
* ap->flags because it's referenced in many LLDs and will be
_
-
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