Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=001102d7859be0e7f7b9f2d62b841f2c0f9c2640
Commit: 001102d7859be0e7f7b9f2d62b841f2c0f9c2640
Parent: 55dba3120fbcbea6800f9a18503d25f73212a347
Author: Tejun Heo <[EMAIL PROTECTED]>
AuthorDate: Wed Dec 5 16:43:09 2007 +0900
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Wed Jan 23 05:24:14 2008 -0500
libata: kill non-sg DMA interface
With atapi_request_sense() converted to use sg, there's no user of
non-sg interface. Kill non-sg interface.
* ATA_QCFLAG_SINGLE and ATA_QCFLAG_SG are removed. ATA_QCFLAG_DMAMAP
is used instead. (this way no LLD change is necessary)
* qc->buf_virt is removed.
* ata_sg_init_one() and ata_sg_setup_one() are removed.
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
Cc: Rusty Russel <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/ata/libata-core.c | 148 +++++----------------------------------------
include/linux/libata.h | 7 +--
2 files changed, 16 insertions(+), 139 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 39cedd9..76360f0 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4478,9 +4478,6 @@ void ata_sg_clean(struct ata_queued_cmd *qc)
WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
WARN_ON(sg == NULL);
- if (qc->flags & ATA_QCFLAG_SINGLE)
- WARN_ON(qc->n_elem > 1);
-
VPRINTK("unmapping %u sg elements\n", qc->n_elem);
/* if we padded the buffer out to 32-bit bound, and data
@@ -4490,27 +4487,15 @@ void ata_sg_clean(struct ata_queued_cmd *qc)
if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
- if (qc->flags & ATA_QCFLAG_SG) {
- if (qc->n_elem)
- dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
- /* restore last sg */
- sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
- if (pad_buf) {
- struct scatterlist *psg = &qc->pad_sgent;
- void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
- memcpy(addr + psg->offset, pad_buf, qc->pad_len);
- kunmap_atomic(addr, KM_IRQ0);
- }
- } else {
- if (qc->n_elem)
- dma_unmap_single(ap->dev,
- sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
- dir);
- /* restore sg */
- sg->length += qc->pad_len;
- if (pad_buf)
- memcpy(qc->buf_virt + sg->length - qc->pad_len,
- pad_buf, qc->pad_len);
+ if (qc->n_elem)
+ dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
+ /* restore last sg */
+ sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
+ if (pad_buf) {
+ struct scatterlist *psg = &qc->pad_sgent;
+ void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
+ memcpy(addr + psg->offset, pad_buf, qc->pad_len);
+ kunmap_atomic(addr, KM_IRQ0);
}
qc->flags &= ~ATA_QCFLAG_DMAMAP;
@@ -4765,33 +4750,6 @@ void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
/**
- * ata_sg_init_one - Associate command with memory buffer
- * @qc: Command to be associated
- * @buf: Memory buffer
- * @buflen: Length of memory buffer, in bytes.
- *
- * Initialize the data-related elements of queued_cmd @qc
- * to point to a single memory buffer, @buf of byte length @buflen.
- *
- * LOCKING:
- * spin_lock_irqsave(host lock)
- */
-
-void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
-{
- qc->flags |= ATA_QCFLAG_SINGLE;
-
- qc->__sg = &qc->sgent;
- qc->n_elem = 1;
- qc->orig_n_elem = 1;
- qc->buf_virt = buf;
- qc->nbytes = buflen;
- qc->cursg = qc->__sg;
-
- sg_init_one(&qc->sgent, buf, buflen);
-}
-
-/**
* ata_sg_init - Associate command with scatter-gather table.
* @qc: Command to be associated
* @sg: Scatter-gather table.
@@ -4808,7 +4766,7 @@ void ata_sg_init_one(struct ata_queued_cmd *qc, void
*buf, unsigned int buflen)
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
unsigned int n_elem)
{
- qc->flags |= ATA_QCFLAG_SG;
+ qc->flags |= ATA_QCFLAG_DMAMAP;
qc->__sg = sg;
qc->n_elem = n_elem;
qc->orig_n_elem = n_elem;
@@ -4816,75 +4774,6 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct
scatterlist *sg,
}
/**
- * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
- * @qc: Command with memory buffer to be mapped.
- *
- * DMA-map the memory buffer associated with queued_cmd @qc.
- *
- * LOCKING:
- * spin_lock_irqsave(host lock)
- *
- * RETURNS:
- * Zero on success, negative on error.
- */
-
-static int ata_sg_setup_one(struct ata_queued_cmd *qc)
-{
- struct ata_port *ap = qc->ap;
- int dir = qc->dma_dir;
- struct scatterlist *sg = qc->__sg;
- dma_addr_t dma_address;
- int trim_sg = 0;
-
- /* we must lengthen transfers to end on a 32-bit boundary */
- qc->pad_len = sg->length & 3;
- if (qc->pad_len) {
- void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
- struct scatterlist *psg = &qc->pad_sgent;
-
- WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
-
- memset(pad_buf, 0, ATA_DMA_PAD_SZ);
-
- if (qc->tf.flags & ATA_TFLAG_WRITE)
- memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
- qc->pad_len);
-
- sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
- sg_dma_len(psg) = ATA_DMA_PAD_SZ;
- /* trim sg */
- sg->length -= qc->pad_len;
- if (sg->length == 0)
- trim_sg = 1;
-
- DPRINTK("padding done, sg->length=%u pad_len=%u\n",
- sg->length, qc->pad_len);
- }
-
- if (trim_sg) {
- qc->n_elem--;
- goto skip_map;
- }
-
- dma_address = dma_map_single(ap->dev, qc->buf_virt,
- sg->length, dir);
- if (dma_mapping_error(dma_address)) {
- /* restore sg */
- sg->length += qc->pad_len;
- return -1;
- }
-
- sg_dma_address(sg) = dma_address;
- sg_dma_len(sg) = sg->length;
-
-skip_map:
- DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
- qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
-
- return 0;
-}
-
-/**
* ata_sg_setup - DMA-map the scatter-gather table associated with a
command.
* @qc: Command with scatter-gather table to be mapped.
*
@@ -4906,7 +4795,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
int n_elem, pre_n_elem, dir, trim_sg = 0;
VPRINTK("ENTER, ata%u\n", ap->print_id);
- WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
+ WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
/* we must lengthen transfers to end on a 32-bit boundary */
qc->pad_len = lsg->length & 3;
@@ -6025,16 +5914,10 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
if (ata_is_dma(prot) || (ata_is_pio(prot) &&
(ap->flags & ATA_FLAG_PIO_DMA))) {
- if (qc->flags & ATA_QCFLAG_SG) {
- if (ata_sg_setup(qc))
- goto sg_err;
- } else if (qc->flags & ATA_QCFLAG_SINGLE) {
- if (ata_sg_setup_one(qc))
- goto sg_err;
- }
- } else {
- qc->flags &= ~ATA_QCFLAG_DMAMAP;
- }
+ if (ata_sg_setup(qc))
+ goto sg_err;
+ } else
+ qc->flags &= ATA_QCFLAG_DMAMAP;
/* if device is sleeping, schedule softreset and abort the link */
if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
@@ -7612,7 +7495,6 @@ EXPORT_SYMBOL_GPL(ata_host_register);
EXPORT_SYMBOL_GPL(ata_host_activate);
EXPORT_SYMBOL_GPL(ata_host_detach);
EXPORT_SYMBOL_GPL(ata_sg_init);
-EXPORT_SYMBOL_GPL(ata_sg_init_one);
EXPORT_SYMBOL_GPL(ata_hsm_move);
EXPORT_SYMBOL_GPL(ata_qc_complete);
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7fa96cb..acd90ad 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -219,9 +219,7 @@ enum {
/* struct ata_queued_cmd flags */
ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
- ATA_QCFLAG_SG = (1 << 1), /* have s/g table? */
- ATA_QCFLAG_SINGLE = (1 << 2), /* no s/g, just a single buffer */
- ATA_QCFLAG_DMAMAP = ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
+ ATA_QCFLAG_DMAMAP = (1 << 1), /* SG table is DMA mapped */
ATA_QCFLAG_IO = (1 << 3), /* standard IO command */
ATA_QCFLAG_RESULT_TF = (1 << 4), /* result TF requested */
ATA_QCFLAG_CLEAR_EXCL = (1 << 5), /* clear excl_link on completion */
@@ -475,7 +473,6 @@ struct ata_queued_cmd {
struct scatterlist sgent;
struct scatterlist pad_sgent;
- void *buf_virt;
/* DO NOT iterate over __sg manually, use ata_for_each_sg() */
struct scatterlist *__sg;
@@ -891,8 +888,6 @@ extern void ata_dumb_qc_prep(struct ata_queued_cmd *qc);
extern void ata_qc_prep(struct ata_queued_cmd *qc);
extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
-extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
- unsigned int buflen);
extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
unsigned int n_elem);
extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
-
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