[libata] Add ATA transport class
This is a scheleton for libata transport class.
All information is read only, exporting information from libata:
- ata_port class: one per ATA port
- ata_link class: one per ATA port or 15 for SATA Port Multiplier
- ata_device class: up to 2 for PATA link, usually one for SATA.
Signed-off-by: Gwendal Grignou <gwendal@google.com>
Reviewed-by: Grant Grundler <grundler@google.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 45fb296..c50f66d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -604,6 +604,7 @@
union acpi_object *gtf_cache;
unsigned int gtf_filter;
#endif
+ struct device tdev;
/* n_sector is CLEAR_BEGIN, read comment above CLEAR_BEGIN */
u64 n_sectors; /* size of device, if ATA */
u64 n_native_sectors; /* native size, if ATA */
@@ -690,6 +691,7 @@
struct ata_port *ap;
int pmp; /* port multiplier port # */
+ struct device tdev;
unsigned int active_tag; /* active tag on this link */
u32 sactive; /* active NCQ commands */
@@ -707,6 +709,8 @@
struct ata_device device[ATA_MAX_DEVICES];
};
+#define ATA_LINK_CLEAR_BEGIN offsetof(struct ata_link, active_tag)
+#define ATA_LINK_CLEAR_END offsetof(struct ata_link, device[0])
struct ata_port {
struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
@@ -752,6 +756,7 @@
struct ata_port_stats stats;
struct ata_host *host;
struct device *dev;
+ struct device tdev;
struct mutex scsi_scan_mutex;
struct delayed_work hotplug_task;