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authorTejun Heo <htejun@gmail.com>2006-11-14 22:47:09 +0900
committerTejun Heo <htejun@gmail.com>2006-12-03 17:56:24 +0900
commit2432697ba0ce312d60be5009ffe1fa054a761bb9 (patch)
tree8fe745ffb50986bee7d0cab5281278c7f77f983c
parent0f0a3ad3741fd93461fcfb85dc577103c58d9be8 (diff)
[PATCH] libata: implement ata_exec_internal_sg()
Sg'ify ata_exec_internal() and call it ata_exec_internal_sg(). Wrapper function around ata_exec_internal_sg() is implemented to provide ata_exec_internal() interface. Signed-off-by: Tejun Heo <htejun@gmail.com>
-rw-r--r--drivers/ata/libata-core.c49
-rw-r--r--drivers/ata/libata.h4
2 files changed, 46 insertions, 7 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 47c70392ec4..0a5103b707c 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1042,13 +1042,13 @@ void ata_qc_complete_internal(struct ata_queued_cmd *qc)
}
/**
- * ata_exec_internal - execute libata internal command
+ * ata_exec_internal_sg - execute libata internal command
* @dev: Device to which the command is sent
* @tf: Taskfile registers for the command and the result
* @cdb: CDB for packet command
* @dma_dir: Data tranfer direction of the command
- * @buf: Data buffer of the command
- * @buflen: Length of data buffer
+ * @sg: sg list for the data buffer of the command
+ * @n_elem: Number of sg entries
*
* Executes libata internal command with timeout. @tf contains
* command on entry and result on return. Timeout and error
@@ -1062,9 +1062,10 @@ void ata_qc_complete_internal(struct ata_queued_cmd *qc)
* RETURNS:
* Zero on success, AC_ERR_* mask on failure
*/
-unsigned ata_exec_internal(struct ata_device *dev,
- struct ata_taskfile *tf, const u8 *cdb,
- int dma_dir, void *buf, unsigned int buflen)
+unsigned ata_exec_internal_sg(struct ata_device *dev,
+ struct ata_taskfile *tf, const u8 *cdb,
+ int dma_dir, struct scatterlist *sg,
+ unsigned int n_elem)
{
struct ata_port *ap = dev->ap;
u8 command = tf->command;
@@ -1120,7 +1121,12 @@ unsigned ata_exec_internal(struct ata_device *dev,
qc->flags |= ATA_QCFLAG_RESULT_TF;
qc->dma_dir = dma_dir;
if (dma_dir != DMA_NONE) {
- ata_sg_init_one(qc, buf, buflen);
+ unsigned int i, buflen = 0;
+
+ for (i = 0; i < n_elem; i++)
+ buflen += sg[i].length;
+
+ ata_sg_init(qc, sg, n_elem);
qc->nsect = buflen / ATA_SECT_SIZE;
}
@@ -1204,6 +1210,35 @@ unsigned ata_exec_internal(struct ata_device *dev,
}
/**
+ * ata_exec_internal_sg - execute libata internal command
+ * @dev: Device to which the command is sent
+ * @tf: Taskfile registers for the command and the result
+ * @cdb: CDB for packet command
+ * @dma_dir: Data tranfer direction of the command
+ * @buf: Data buffer of the command
+ * @buflen: Length of data buffer
+ *
+ * Wrapper around ata_exec_internal_sg() which takes simple
+ * buffer instead of sg list.
+ *
+ * LOCKING:
+ * None. Should be called with kernel context, might sleep.
+ *
+ * RETURNS:
+ * Zero on success, AC_ERR_* mask on failure
+ */
+unsigned ata_exec_internal(struct ata_device *dev,
+ struct ata_taskfile *tf, const u8 *cdb,
+ int dma_dir, void *buf, unsigned int buflen)
+{
+ struct scatterlist sg;
+
+ sg_init_one(&sg, buf, buflen);
+
+ return ata_exec_internal_sg(dev, tf, cdb, dma_dir, &sg, 1);
+}
+
+/**
* ata_do_simple_cmd - execute simple internal command
* @dev: Device to which the command is sent
* @cmd: Opcode to execute
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 2d532da8c39..ca6f36c1311 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -58,6 +58,10 @@ extern void ata_port_flush_task(struct ata_port *ap);
extern unsigned ata_exec_internal(struct ata_device *dev,
struct ata_taskfile *tf, const u8 *cdb,
int dma_dir, void *buf, unsigned int buflen);
+extern unsigned ata_exec_internal_sg(struct ata_device *dev,
+ struct ata_taskfile *tf, const u8 *cdb,
+ int dma_dir, struct scatterlist *sg,
+ unsigned int n_elem);
extern unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd);
extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
unsigned int flags, u16 *id);