* [PATCH] mmc: core: Add packed command for eMMC4.5 device
@ 2011-10-27 10:54 Seungwon Jeon
2011-10-27 13:22 ` S, Venkatraman
2011-11-16 11:15 ` Sahitya Tummala
0 siblings, 2 replies; 8+ messages in thread
From: Seungwon Jeon @ 2011-10-27 10:54 UTC (permalink / raw)
To: linux-mmc; +Cc: linux-samsung-soc, Chris Ball, dh.han, Seungwon Jeon
This patch supports packed command feature of eMMC4.5 Spec.
Several reads(or writes) can be grouped in packed command
and all data of the individual commands can be sent in one
transfer on the bus.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
---
drivers/mmc/card/block.c | 349 ++++++++++++++++++++++++++++++++++++++++++++--
drivers/mmc/card/queue.c | 48 ++++++-
drivers/mmc/card/queue.h | 12 ++
drivers/mmc/core/mmc.c | 20 +++
include/linux/mmc/card.h | 3 +
include/linux/mmc/host.h | 1 +
include/linux/mmc/mmc.h | 15 ++
7 files changed, 434 insertions(+), 14 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 4fd5723..0258a81 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -45,6 +45,7 @@
#include <asm/uaccess.h>
#include "queue.h"
+#include "../core/mmc_ops.h"
MODULE_ALIAS("mmc:block");
#ifdef MODULE_PARAM_PREFIX
@@ -59,6 +60,10 @@ MODULE_ALIAS("mmc:block");
#define INAND_CMD38_ARG_SECTRIM1 0x81
#define INAND_CMD38_ARG_SECTRIM2 0x88
+#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
+ (req->cmd_flags & REQ_META)) && \
+ (rq_data_dir(req) == WRITE))
+
static DEFINE_MUTEX(block_mutex);
/*
@@ -943,7 +948,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
* kind. If it was a write, we may have transitioned to
* program mode, which we have to wait for it to complete.
*/
- if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
+ if ((!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) ||
+ (mq_mrq->packed_cmd == MMC_PACKED_WR_HDR)) {
u32 status;
do {
int err = get_card_status(card, &status, 5);
@@ -980,12 +986,67 @@ static int mmc_blk_err_check(struct mmc_card *card,
if (!brq->data.bytes_xfered)
return MMC_BLK_RETRY;
+ if (mq_mrq->packed_cmd != MMC_PACKED_NONE) {
+ if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
+ return MMC_BLK_PARTIAL;
+ else
+ return MMC_BLK_SUCCESS;
+ }
+
if (blk_rq_bytes(req) != brq->data.bytes_xfered)
return MMC_BLK_PARTIAL;
return MMC_BLK_SUCCESS;
}
+static int mmc_blk_packed_err_check(struct mmc_card *card,
+ struct mmc_async_req *areq)
+{
+ struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
+ mmc_active);
+ int err, check, status;
+ u8 ext_csd[512];
+
+ check = mmc_blk_err_check(card, areq);
+
+ if (check == MMC_BLK_SUCCESS)
+ return check;
+
+ if (check == MMC_BLK_PARTIAL) {
+ err = get_card_status(card, &status, 0);
+ if (err)
+ return MMC_BLK_ABORT;
+
+ if (status & R1_EXP_EVENT) {
+ err = mmc_send_ext_csd(card, ext_csd);
+ if (err)
+ return MMC_BLK_ABORT;
+
+ if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0] &
+ EXT_CSD_PACKED_FAILURE) &&
+ (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
+ EXT_CSD_PACKED_GENERIC_ERROR)) {
+ if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
+ EXT_CSD_PACKED_INDEXED_ERROR) {
+ /* Make be 0-based */
+ mq_mrq->packed_fail_idx =
+ ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
+ return MMC_BLK_PARTIAL;
+ } else {
+ return MMC_BLK_RETRY;
+ }
+ }
+ } else {
+ return MMC_BLK_RETRY;
+ }
+ }
+
+ if (check != MMC_BLK_ABORT)
+ return MMC_BLK_RETRY;
+ else
+ return MMC_BLK_ABORT;
+}
+
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
struct mmc_card *card,
int disable_multi,
@@ -1126,6 +1187,207 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
mmc_queue_bounce_pre(mqrq);
}
+static u8 mmc_blk_chk_packable(struct mmc_queue *mq, struct request *req)
+{
+ struct request_queue *q = mq->queue;
+ struct mmc_card *card = mq->card;
+ struct request *cur = req, *next = NULL;
+ struct mmc_blk_data *md = mq->data;
+ bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
+ unsigned int req_sectors = 0, phys_segments = 0;
+ unsigned int max_blk_count, max_phys_segs;
+ u8 max_packed_rw = 0;
+ u8 reqs = 0;
+
+ if (!(md->flags & MMC_BLK_CMD23) &&
+ !card->ext_csd.packed_event_en)
+ goto no_packed;
+
+ if (rq_data_dir(cur) == READ)
+ max_packed_rw = card->ext_csd.max_packed_reads;
+ else
+ max_packed_rw = card->ext_csd.max_packed_writes;
+
+ if (max_packed_rw == 0)
+ goto no_packed;
+
+ if (mmc_req_rel_wr(cur) &&
+ (md->flags & MMC_BLK_REL_WR) &&
+ !en_rel_wr) {
+ goto no_packed;
+ }
+
+ max_blk_count = min(card->host->max_blk_count,
+ card->host->max_req_size >> 9);
+ max_phys_segs = queue_max_segments(q);
+ req_sectors += blk_rq_sectors(cur);
+ phys_segments += req->nr_phys_segments;
+
+ if (rq_data_dir(cur) == WRITE) {
+ req_sectors++;
+ phys_segments++;
+ }
+
+ while (reqs < max_packed_rw - 1) {
+ next = blk_fetch_request(q);
+ if (!next)
+ break;
+
+ if (rq_data_dir(cur) != rq_data_dir(next)) {
+ blk_requeue_request(q, next);
+ break;
+ }
+
+ if (mmc_req_rel_wr(next) &&
+ (md->flags & MMC_BLK_REL_WR) &&
+ !en_rel_wr) {
+ blk_requeue_request(q, next);
+ break;
+ }
+
+ req_sectors += blk_rq_sectors(next);
+ if (req_sectors > max_blk_count) {
+ blk_requeue_request(q, next);
+ break;
+ }
+
+ phys_segments += next->nr_phys_segments;
+ if (phys_segments > max_phys_segs) {
+ blk_requeue_request(q, next);
+ break;
+ }
+
+ list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
+ cur = next;
+ reqs++;
+ }
+
+ if (reqs > 0) {
+ list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
+ return (reqs + 1);
+ }
+
+no_packed:
+ mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
+ return reqs;
+}
+
+static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
+ struct mmc_card *card,
+ struct mmc_queue *mq,
+ u8 reqs)
+{
+ struct mmc_blk_request *brq = &mqrq->brq;
+ struct request *req = mqrq->req;
+ struct request *prq;
+ struct mmc_blk_data *md = mq->data;
+ bool do_rel_wr;
+ u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
+ u8 i =1;
+
+ mqrq->packed_cmd = (rq_data_dir(req) == READ) ?
+ MMC_PACKED_WR_HDR : MMC_PACKED_WRITE;
+ mqrq->packed_blocks = 0;
+ mqrq->packed_fail_idx = -1;
+
+ memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
+ packed_cmd_hdr[0] = (reqs << 16) |
+ (((rq_data_dir(req) == READ) ? 0x01 : 0x02) << 8) | (0x01 << 0);
+
+ /*
+ * Argument for each entry of packed group
+ */
+ list_for_each_entry(prq, &mqrq->packed_list, queuelist) {
+ do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
+ /* Argument of CMD23*/
+ packed_cmd_hdr[(i * 2)] = (do_rel_wr ? (1 << 31) : 0) |
+ blk_rq_sectors(prq);
+ /* Argument of CMD18 or CMD25 */
+ packed_cmd_hdr[((i * 2)) + 1] = mmc_card_blockaddr(card) ?
+ blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
+ mqrq->packed_blocks += blk_rq_sectors(prq);
+ i++;
+ }
+
+ memset(brq, 0, sizeof(struct mmc_blk_request));
+ brq->mrq.cmd = &brq->cmd;
+ brq->mrq.data = &brq->data;
+ brq->mrq.sbc = &brq->sbc;
+ brq->mrq.stop = &brq->stop;
+
+ brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
+ brq->sbc.arg = (0 << 31) | (1 << 30) |
+ ((rq_data_dir(req) == READ) ? 1 : mqrq->packed_blocks + 1);
+ brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+ brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
+ brq->cmd.arg = blk_rq_pos(req);
+ if (!mmc_card_blockaddr(card))
+ brq->cmd.arg <<= 9;
+ brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ brq->data.blksz = 512;
+ /*
+ * Write separately the packd command header only for packed read.
+ * In case of packed write, header is sent with blocks of data.
+ */
+ brq->data.blocks = (rq_data_dir(req) == READ) ?
+ 1 : mqrq->packed_blocks + 1;
+ brq->data.flags |= MMC_DATA_WRITE;
+
+ brq->stop.opcode = MMC_STOP_TRANSMISSION;
+ brq->stop.arg = 0;
+ brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
+
+ mmc_set_data_timeout(&brq->data, card);
+
+ brq->data.sg = mqrq->sg;
+ brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
+
+ mqrq->mmc_active.mrq = &brq->mrq;
+ mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
+
+ mmc_queue_bounce_pre(mqrq);
+}
+
+static void mmc_blk_packed_rrq_prep(struct mmc_queue_req *mqrq,
+ struct mmc_card *card,
+ struct mmc_queue *mq)
+{
+ struct mmc_blk_request *brq = &mqrq->brq;
+ struct request *req = mqrq->req;
+
+ mqrq->packed_cmd = MMC_PACKED_READ;
+
+ memset(brq, 0, sizeof(struct mmc_blk_request));
+ brq->mrq.cmd = &brq->cmd;
+ brq->mrq.data = &brq->data;
+ brq->mrq.stop = &brq->stop;
+
+ brq->cmd.opcode = MMC_READ_MULTIPLE_BLOCK;
+ brq->cmd.arg = blk_rq_pos(req);
+ if (!mmc_card_blockaddr(card))
+ brq->cmd.arg <<= 9;
+ brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+ brq->data.blksz = 512;
+ brq->data.blocks = mqrq->packed_blocks;
+ brq->data.flags |= MMC_DATA_READ;
+
+ brq->stop.opcode = MMC_STOP_TRANSMISSION;
+ brq->stop.arg = 0;
+ brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
+
+ mmc_set_data_timeout(&brq->data, card);
+
+ brq->data.sg = mqrq->sg;
+ brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
+
+ mqrq->mmc_active.mrq = &brq->mrq;
+ mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
+
+ mmc_queue_bounce_pre(mqrq);
+}
+
static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
struct mmc_blk_request *brq, struct request *req,
int ret)
@@ -1163,15 +1425,33 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
int ret = 1, disable_multi = 0, retry = 0, type;
enum mmc_blk_status status;
struct mmc_queue_req *mq_rq;
- struct request *req;
+ struct request *req, *prq;
struct mmc_async_req *areq;
+ u8 reqs = 0;
if (!rqc && !mq->mqrq_prev->req)
return 0;
+ if (rqc)
+ reqs = mmc_blk_chk_packable(mq, rqc);
+
do {
if (rqc) {
- mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
+ if (reqs >= 2) {
+ mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
+ if (rq_data_dir(rqc) == READ) {
+ areq = &mq->mqrq_cur->mmc_active;
+ mmc_wait_for_req(card->host, areq->mrq);
+ status = mmc_blk_packed_err_check(card, areq);
+ if (status == MMC_BLK_SUCCESS) {
+ mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
+ } else {
+ goto check_status;
+ }
+ }
+ } else {
+ mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
+ }
areq = &mq->mqrq_cur->mmc_active;
} else
areq = NULL;
@@ -1179,6 +1459,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
if (!areq)
return 0;
+check_status:
mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
brq = &mq_rq->brq;
req = mq_rq->req;
@@ -1192,10 +1473,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
* A block was successfully transferred.
*/
mmc_blk_reset_success(md, type);
- spin_lock_irq(&md->lock);
- ret = __blk_end_request(req, 0,
+
+ if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
+ int idx = mq_rq->packed_fail_idx, i = 0;
+ while (!list_empty(&mq_rq->packed_list)) {
+ prq = list_entry_rq(mq_rq->packed_list.next);
+ if (idx == i) {
+ /* retry from error index */
+ reqs -= idx;
+ mq_rq->req = prq;
+ ret = 1;
+ break;
+ }
+ list_del_init(&prq->queuelist);
+ spin_lock_irq(&md->lock);
+ ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
+ spin_unlock_irq(&md->lock);
+ i++;
+ }
+ break;
+ } else {
+ spin_lock_irq(&md->lock);
+ ret = __blk_end_request(req, 0,
brq->data.bytes_xfered);
- spin_unlock_irq(&md->lock);
+ spin_unlock_irq(&md->lock);
+ }
+
/*
* If the blk_end_request function returns non-zero even
* though all data has been transferred and no errors
@@ -1254,7 +1557,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
break;
}
- if (ret) {
+ if (ret && (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
/*
* In case of a incomplete request
* prepare it again and resend.
@@ -1267,13 +1570,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
return 1;
cmd_abort:
- spin_lock_irq(&md->lock);
- while (ret)
- ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
- spin_unlock_irq(&md->lock);
+ if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
+ spin_lock_irq(&md->lock);
+ while (ret)
+ ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
+ spin_unlock_irq(&md->lock);
+ } else {
+ while (!list_empty(&mq_rq->packed_list)) {
+ prq = list_entry_rq(mq_rq->packed_list.next);
+ list_del_init(&prq->queuelist);
+ spin_lock_irq(&md->lock);
+ __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
+ spin_unlock_irq(&md->lock);
+ }
+ }
start_new_req:
if (rqc) {
+ /*
+ * If current request is packed, it need to put back.
+ */
+ if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
+ while (!list_empty(&mq->mqrq_cur->packed_list)) {
+ prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
+ if (prq->queuelist.prev != &mq->mqrq_cur->packed_list) {
+ list_del_init(&prq->queuelist);
+ blk_requeue_request(mq->queue, prq);
+ } else {
+ list_del_init(&prq->queuelist);
+ }
+ }
+ }
mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
}
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index dcad59c..3a4542e 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -172,6 +172,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
+ INIT_LIST_HEAD(&mqrq_cur->packed_list);
+ INIT_LIST_HEAD(&mqrq_prev->packed_list);
mq->mqrq_cur = mqrq_cur;
mq->mqrq_prev = mqrq_prev;
mq->queue->queuedata = mq;
@@ -372,6 +374,39 @@ void mmc_queue_resume(struct mmc_queue *mq)
}
}
+static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
+ struct mmc_queue_req *mqrq,
+ struct scatterlist *sg)
+{
+ struct scatterlist *__sg;
+ unsigned int sg_len = 0;
+ struct request *req;
+ enum mmc_packed_cmd cmd;
+
+ cmd = mqrq->packed_cmd;
+
+ if (cmd == MMC_PACKED_WR_HDR || cmd == MMC_PACKED_WRITE) {
+ __sg =sg;
+ sg_set_buf(__sg, mqrq->packed_cmd_hdr,
+ sizeof(mqrq->packed_cmd_hdr));
+ sg_len++;
+ if (cmd == MMC_PACKED_WR_HDR) {
+ sg_mark_end(__sg);
+ return sg_len;
+ }
+ __sg->page_link &= ~0x02;
+ }
+
+ __sg = sg + sg_len;
+ list_for_each_entry(req, &mqrq->packed_list, queuelist) {
+ sg_len += blk_rq_map_sg(mq->queue, req, __sg);
+ __sg = sg + (sg_len - 1);
+ (__sg++)->page_link &= ~0x02;
+ }
+ sg_mark_end(sg + (sg_len - 1));
+ return sg_len;
+}
+
/*
* Prepare the sg list(s) to be handed of to the host driver
*/
@@ -382,12 +417,19 @@ unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
struct scatterlist *sg;
int i;
- if (!mqrq->bounce_buf)
- return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
+ if (!mqrq->bounce_buf) {
+ if (!list_empty(&mqrq->packed_list))
+ return mmc_queue_packed_map_sg(mq, mqrq, mqrq->sg);
+ else
+ return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
+ }
BUG_ON(!mqrq->bounce_sg);
- sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
+ if (!list_empty(&mqrq->packed_list))
+ sg_len = mmc_queue_packed_map_sg(mq, mqrq, mqrq->bounce_sg);
+ else
+ sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
mqrq->bounce_sg_len = sg_len;
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index d2a1eb4..5d0131e 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -12,6 +12,13 @@ struct mmc_blk_request {
struct mmc_data data;
};
+enum mmc_packed_cmd {
+ MMC_PACKED_NONE = 0,
+ MMC_PACKED_WR_HDR,
+ MMC_PACKED_WRITE,
+ MMC_PACKED_READ,
+};
+
struct mmc_queue_req {
struct request *req;
struct mmc_blk_request brq;
@@ -20,6 +27,11 @@ struct mmc_queue_req {
struct scatterlist *bounce_sg;
unsigned int bounce_sg_len;
struct mmc_async_req mmc_active;
+ struct list_head packed_list;
+ u32 packed_cmd_hdr[128];
+ unsigned int packed_blocks;
+ enum mmc_packed_cmd packed_cmd;
+ int packed_fail_idx;
};
struct mmc_queue {
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 3627044..eab01c1 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -487,6 +487,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
+
+ card->ext_csd.max_packed_writes = ext_csd[EXT_CSD_MAX_PACKED_WRITES];
+ card->ext_csd.max_packed_reads = ext_csd[EXT_CSD_MAX_PACKED_READS];
}
out:
@@ -1072,6 +1075,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
card->ext_csd.cache_ctrl = err ? 0 : 1;
}
+ if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
+ (card->ext_csd.max_packed_writes > 0) &&
+ (card->ext_csd.max_packed_reads > 0)) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_EXP_EVENTS_CTRL,
+ EXT_CSD_PACKED_EVENT_EN,
+ card->ext_csd.generic_cmd6_time);
+ if (err && err != -EBADMSG)
+ goto free_card;
+ if (err) {
+ pr_warning("%s: Enabling packed event failed\n",
+ mmc_hostname(card->host));
+ err = 0;
+ } else
+ card->ext_csd.packed_event_en = 1;
+ }
+
if (!oldcard)
host->card = card;
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 6e04e10..3ffd93f 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -52,6 +52,9 @@ struct mmc_ext_csd {
u8 part_config;
u8 cache_ctrl;
u8 rst_n_function;
+ u8 max_packed_writes;
+ u8 max_packed_reads;
+ u8 packed_event_en;
unsigned int part_time; /* Units: ms */
unsigned int sa_timeout; /* Units: 100ns */
unsigned int generic_cmd6_time; /* Units: 10ms */
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index a3ac9c4..d2e4210 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -242,6 +242,7 @@ struct mmc_host {
#define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
#define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
+#define MMC_CAP2_PACKED_CMD (1 << 4) /* Allow packed command */
mmc_pm_flag_t pm_caps; /* supported pm features */
unsigned int power_notify_type;
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 0e71356..1988780 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -138,6 +138,7 @@ static inline bool mmc_op_multi(u32 opcode)
#define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */
#define R1_READY_FOR_DATA (1 << 8) /* sx, a */
#define R1_SWITCH_ERROR (1 << 7) /* sx, c */
+#define R1_EXP_EVENT (1 << 6) /* sr, a */
#define R1_APP_CMD (1 << 5) /* sr, c */
#define R1_STATE_IDLE 0
@@ -273,6 +274,10 @@ struct _mmc_csd {
#define EXT_CSD_FLUSH_CACHE 32 /* W */
#define EXT_CSD_CACHE_CTRL 33 /* R/W */
#define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
+#define EXT_CSD_PACKED_FAILURE_INDEX 35 /* RO */
+#define EXT_CSD_PACKED_CMD_STATUS 36 /* RO */
+#define EXT_CSD_EXP_EVENTS_STATUS 54 /* RO, 2 bytes */
+#define EXT_CSD_EXP_EVENTS_CTRL 56 /* R/W, 2 bytes */
#define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
#define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
#define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
@@ -313,6 +318,8 @@ struct _mmc_csd {
#define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
#define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
#define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
+#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
+#define EXT_CSD_MAX_PACKED_READS 501 /* RO */
#define EXT_CSD_HPI_FEATURES 503 /* RO */
/*
@@ -364,6 +371,14 @@ struct _mmc_csd {
#define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
#define EXT_CSD_PWR_CL_8BIT_SHIFT 4
#define EXT_CSD_PWR_CL_4BIT_SHIFT 0
+
+#define EXT_CSD_PACKED_EVENT_EN (1<<3)
+
+#define EXT_CSD_PACKED_FAILURE (1<<3)
+
+#define EXT_CSD_PACKED_GENERIC_ERROR (1<<0)
+#define EXT_CSD_PACKED_INDEXED_ERROR (1<<1)
+
/*
* MMC_SWITCH access modes
*/
--
1.7.2.3
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] mmc: core: Add packed command for eMMC4.5 device
2011-10-27 10:54 [PATCH] mmc: core: Add packed command for eMMC4.5 device Seungwon Jeon
@ 2011-10-27 13:22 ` S, Venkatraman
2011-10-28 5:44 ` Seungwon Jeon
2011-11-16 11:15 ` Sahitya Tummala
1 sibling, 1 reply; 8+ messages in thread
From: S, Venkatraman @ 2011-10-27 13:22 UTC (permalink / raw)
To: Seungwon Jeon; +Cc: linux-mmc, linux-samsung-soc, Chris Ball, dh.han
On Thu, Oct 27, 2011 at 4:24 PM, Seungwon Jeon <tgih.jun@samsung.com> wrote:
> This patch supports packed command feature of eMMC4.5 Spec.
> Several reads(or writes) can be grouped in packed command
> and all data of the individual commands can be sent in one
> transfer on the bus.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
> ---
> drivers/mmc/card/block.c | 349 ++++++++++++++++++++++++++++++++++++++++++++--
> drivers/mmc/card/queue.c | 48 ++++++-
> drivers/mmc/card/queue.h | 12 ++
> drivers/mmc/core/mmc.c | 20 +++
> include/linux/mmc/card.h | 3 +
> include/linux/mmc/host.h | 1 +
> include/linux/mmc/mmc.h | 15 ++
> 7 files changed, 434 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 4fd5723..0258a81 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -45,6 +45,7 @@
> #include <asm/uaccess.h>
>
> #include "queue.h"
> +#include "../core/mmc_ops.h"
I don't think this is the right way to include files. The core
directory should be in the include path already.
>
> MODULE_ALIAS("mmc:block");
> #ifdef MODULE_PARAM_PREFIX
> @@ -59,6 +60,10 @@ MODULE_ALIAS("mmc:block");
> #define INAND_CMD38_ARG_SECTRIM1 0x81
> #define INAND_CMD38_ARG_SECTRIM2 0x88
>
> +#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
> + (req->cmd_flags & REQ_META)) && \
> + (rq_data_dir(req) == WRITE))
> +
> static DEFINE_MUTEX(block_mutex);
>
> /*
> @@ -943,7 +948,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
> * kind. If it was a write, we may have transitioned to
> * program mode, which we have to wait for it to complete.
> */
> - if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
> + if ((!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) ||
> + (mq_mrq->packed_cmd == MMC_PACKED_WR_HDR)) {
> u32 status;
> do {
> int err = get_card_status(card, &status, 5);
> @@ -980,12 +986,67 @@ static int mmc_blk_err_check(struct mmc_card *card,
> if (!brq->data.bytes_xfered)
> return MMC_BLK_RETRY;
>
> + if (mq_mrq->packed_cmd != MMC_PACKED_NONE) {
> + if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
> + return MMC_BLK_PARTIAL;
> + else
> + return MMC_BLK_SUCCESS;
> + }
> +
> if (blk_rq_bytes(req) != brq->data.bytes_xfered)
> return MMC_BLK_PARTIAL;
>
> return MMC_BLK_SUCCESS;
> }
>
> +static int mmc_blk_packed_err_check(struct mmc_card *card,
> + struct mmc_async_req *areq)
> +{
> + struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
> + mmc_active);
> + int err, check, status;
> + u8 ext_csd[512];
> +
> + check = mmc_blk_err_check(card, areq);
> +
> + if (check == MMC_BLK_SUCCESS)
> + return check;
> +
> + if (check == MMC_BLK_PARTIAL) {
> + err = get_card_status(card, &status, 0);
> + if (err)
> + return MMC_BLK_ABORT;
> +
> + if (status & R1_EXP_EVENT) {
> + err = mmc_send_ext_csd(card, ext_csd);
> + if (err)
> + return MMC_BLK_ABORT;
> +
> + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0] &
> + EXT_CSD_PACKED_FAILURE) &&
> + (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
> + EXT_CSD_PACKED_GENERIC_ERROR)) {
> + if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
> + EXT_CSD_PACKED_INDEXED_ERROR) {
> + /* Make be 0-based */
> + mq_mrq->packed_fail_idx =
> + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
> + return MMC_BLK_PARTIAL;
> + } else {
> + return MMC_BLK_RETRY;
> + }
> + }
> + } else {
> + return MMC_BLK_RETRY;
> + }
> + }
> +
> + if (check != MMC_BLK_ABORT)
> + return MMC_BLK_RETRY;
> + else
> + return MMC_BLK_ABORT;
> +}
> +
> static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> struct mmc_card *card,
> int disable_multi,
> @@ -1126,6 +1187,207 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> mmc_queue_bounce_pre(mqrq);
> }
>
> +static u8 mmc_blk_chk_packable(struct mmc_queue *mq, struct request *req)
> +{
> + struct request_queue *q = mq->queue;
> + struct mmc_card *card = mq->card;
> + struct request *cur = req, *next = NULL;
> + struct mmc_blk_data *md = mq->data;
> + bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
> + unsigned int req_sectors = 0, phys_segments = 0;
> + unsigned int max_blk_count, max_phys_segs;
> + u8 max_packed_rw = 0;
> + u8 reqs = 0;
> +
> + if (!(md->flags & MMC_BLK_CMD23) &&
> + !card->ext_csd.packed_event_en)
> + goto no_packed;
> +
> + if (rq_data_dir(cur) == READ)
> + max_packed_rw = card->ext_csd.max_packed_reads;
> + else
> + max_packed_rw = card->ext_csd.max_packed_writes;
> +
> + if (max_packed_rw == 0)
> + goto no_packed;
> +
> + if (mmc_req_rel_wr(cur) &&
> + (md->flags & MMC_BLK_REL_WR) &&
> + !en_rel_wr) {
> + goto no_packed;
> + }
> +
> + max_blk_count = min(card->host->max_blk_count,
> + card->host->max_req_size >> 9);
> + max_phys_segs = queue_max_segments(q);
> + req_sectors += blk_rq_sectors(cur);
> + phys_segments += req->nr_phys_segments;
> +
> + if (rq_data_dir(cur) == WRITE) {
> + req_sectors++;
> + phys_segments++;
> + }
> +
> + while (reqs < max_packed_rw - 1) {
> + next = blk_fetch_request(q);
> + if (!next)
> + break;
> +
> + if (rq_data_dir(cur) != rq_data_dir(next)) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + if (mmc_req_rel_wr(next) &&
> + (md->flags & MMC_BLK_REL_WR) &&
> + !en_rel_wr) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + req_sectors += blk_rq_sectors(next);
> + if (req_sectors > max_blk_count) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + phys_segments += next->nr_phys_segments;
> + if (phys_segments > max_phys_segs) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
> + cur = next;
> + reqs++;
> + }
IIRC, blk_fetch_request gets it from the top of the request_queue and
blk_requeue_request puts it back to the top of the queue
(request_queue->queue_head). Hence, possibly, this loop will keep
fetching and requeing the same request repeatedly ?
> +
> + if (reqs > 0) {
> + list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
> + return (reqs + 1);
> + }
> +
> +no_packed:
> + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
> + return reqs;
> +}
> +
> +static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
> + struct mmc_card *card,
> + struct mmc_queue *mq,
> + u8 reqs)
> +{
> + struct mmc_blk_request *brq = &mqrq->brq;
> + struct request *req = mqrq->req;
> + struct request *prq;
> + struct mmc_blk_data *md = mq->data;
> + bool do_rel_wr;
> + u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
> + u8 i =1;
> +
> + mqrq->packed_cmd = (rq_data_dir(req) == READ) ?
> + MMC_PACKED_WR_HDR : MMC_PACKED_WRITE;
> + mqrq->packed_blocks = 0;
> + mqrq->packed_fail_idx = -1;
> +
> + memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
> + packed_cmd_hdr[0] = (reqs << 16) |
> + (((rq_data_dir(req) == READ) ? 0x01 : 0x02) << 8) | (0x01 << 0);
> +
Too many magic numbers here.
> + /*
> + * Argument for each entry of packed group
> + */
> + list_for_each_entry(prq, &mqrq->packed_list, queuelist) {
> + do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
> + /* Argument of CMD23*/
> + packed_cmd_hdr[(i * 2)] = (do_rel_wr ? (1 << 31) : 0) |
> + blk_rq_sectors(prq);
> + /* Argument of CMD18 or CMD25 */
> + packed_cmd_hdr[((i * 2)) + 1] = mmc_card_blockaddr(card) ?
> + blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
> + mqrq->packed_blocks += blk_rq_sectors(prq);
> + i++;
> + }
> +
> + memset(brq, 0, sizeof(struct mmc_blk_request));
> + brq->mrq.cmd = &brq->cmd;
> + brq->mrq.data = &brq->data;
> + brq->mrq.sbc = &brq->sbc;
> + brq->mrq.stop = &brq->stop;
> +
> + brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
> + brq->sbc.arg = (0 << 31) | (1 << 30) |
> + ((rq_data_dir(req) == READ) ? 1 : mqrq->packed_blocks + 1);
.. and here ^^..
> + brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
> +
> + brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
> + brq->cmd.arg = blk_rq_pos(req);
> + if (!mmc_card_blockaddr(card))
> + brq->cmd.arg <<= 9;
> + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> +
> + brq->data.blksz = 512;
> + /*
> + * Write separately the packd command header only for packed read.
> + * In case of packed write, header is sent with blocks of data.
> + */
> + brq->data.blocks = (rq_data_dir(req) == READ) ?
> + 1 : mqrq->packed_blocks + 1;
> + brq->data.flags |= MMC_DATA_WRITE;
> +
> + brq->stop.opcode = MMC_STOP_TRANSMISSION;
> + brq->stop.arg = 0;
> + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> +
> + mmc_set_data_timeout(&brq->data, card);
> +
> + brq->data.sg = mqrq->sg;
> + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
> +
> + mqrq->mmc_active.mrq = &brq->mrq;
> + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
> +
> + mmc_queue_bounce_pre(mqrq);
> +}
> +
> +static void mmc_blk_packed_rrq_prep(struct mmc_queue_req *mqrq,
> + struct mmc_card *card,
> + struct mmc_queue *mq)
> +{
> + struct mmc_blk_request *brq = &mqrq->brq;
> + struct request *req = mqrq->req;
> +
> + mqrq->packed_cmd = MMC_PACKED_READ;
> +
> + memset(brq, 0, sizeof(struct mmc_blk_request));
> + brq->mrq.cmd = &brq->cmd;
> + brq->mrq.data = &brq->data;
> + brq->mrq.stop = &brq->stop;
> +
> + brq->cmd.opcode = MMC_READ_MULTIPLE_BLOCK;
> + brq->cmd.arg = blk_rq_pos(req);
> + if (!mmc_card_blockaddr(card))
> + brq->cmd.arg <<= 9;
> + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> + brq->data.blksz = 512;
> + brq->data.blocks = mqrq->packed_blocks;
> + brq->data.flags |= MMC_DATA_READ;
> +
> + brq->stop.opcode = MMC_STOP_TRANSMISSION;
> + brq->stop.arg = 0;
> + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> +
> + mmc_set_data_timeout(&brq->data, card);
> +
> + brq->data.sg = mqrq->sg;
> + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
> +
> + mqrq->mmc_active.mrq = &brq->mrq;
> + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
> +
> + mmc_queue_bounce_pre(mqrq);
> +}
> +
> static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
> struct mmc_blk_request *brq, struct request *req,
> int ret)
> @@ -1163,15 +1425,33 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> int ret = 1, disable_multi = 0, retry = 0, type;
> enum mmc_blk_status status;
> struct mmc_queue_req *mq_rq;
> - struct request *req;
> + struct request *req, *prq;
> struct mmc_async_req *areq;
> + u8 reqs = 0;
>
> if (!rqc && !mq->mqrq_prev->req)
> return 0;
>
> + if (rqc)
> + reqs = mmc_blk_chk_packable(mq, rqc);
> +
> do {
> if (rqc) {
> - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> + if (reqs >= 2) {
> + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> + if (rq_data_dir(rqc) == READ) {
> + areq = &mq->mqrq_cur->mmc_active;
> + mmc_wait_for_req(card->host, areq->mrq);
> + status = mmc_blk_packed_err_check(card, areq);
> + if (status == MMC_BLK_SUCCESS) {
> + mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
> + } else {
> + goto check_status;
> + }
> + }
> + } else {
> + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> + }
> areq = &mq->mqrq_cur->mmc_active;
> } else
> areq = NULL;
> @@ -1179,6 +1459,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> if (!areq)
> return 0;
>
> +check_status:
> mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
> brq = &mq_rq->brq;
> req = mq_rq->req;
> @@ -1192,10 +1473,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> * A block was successfully transferred.
> */
> mmc_blk_reset_success(md, type);
> - spin_lock_irq(&md->lock);
> - ret = __blk_end_request(req, 0,
> +
> + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> + int idx = mq_rq->packed_fail_idx, i = 0;
> + while (!list_empty(&mq_rq->packed_list)) {
> + prq = list_entry_rq(mq_rq->packed_list.next);
> + if (idx == i) {
> + /* retry from error index */
> + reqs -= idx;
> + mq_rq->req = prq;
> + ret = 1;
> + break;
> + }
> + list_del_init(&prq->queuelist);
> + spin_lock_irq(&md->lock);
> + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
> + spin_unlock_irq(&md->lock);
> + i++;
> + }
> + break;
> + } else {
> + spin_lock_irq(&md->lock);
> + ret = __blk_end_request(req, 0,
> brq->data.bytes_xfered);
> - spin_unlock_irq(&md->lock);
> + spin_unlock_irq(&md->lock);
> + }
> +
> /*
> * If the blk_end_request function returns non-zero even
> * though all data has been transferred and no errors
> @@ -1254,7 +1557,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> break;
> }
>
> - if (ret) {
> + if (ret && (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
> /*
> * In case of a incomplete request
> * prepare it again and resend.
> @@ -1267,13 +1570,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> return 1;
>
> cmd_abort:
> - spin_lock_irq(&md->lock);
> - while (ret)
> - ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> - spin_unlock_irq(&md->lock);
> + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> + spin_lock_irq(&md->lock);
> + while (ret)
> + ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> + spin_unlock_irq(&md->lock);
> + } else {
> + while (!list_empty(&mq_rq->packed_list)) {
> + prq = list_entry_rq(mq_rq->packed_list.next);
> + list_del_init(&prq->queuelist);
> + spin_lock_irq(&md->lock);
> + __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
> + spin_unlock_irq(&md->lock);
> + }
> + }
>
> start_new_req:
> if (rqc) {
> + /*
> + * If current request is packed, it need to put back.
> + */
> + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
> + while (!list_empty(&mq->mqrq_cur->packed_list)) {
> + prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
> + if (prq->queuelist.prev != &mq->mqrq_cur->packed_list) {
> + list_del_init(&prq->queuelist);
> + blk_requeue_request(mq->queue, prq);
> + } else {
> + list_del_init(&prq->queuelist);
> + }
> + }
> + }
> mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
> }
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index dcad59c..3a4542e 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -172,6 +172,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
>
> memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
> memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
> + INIT_LIST_HEAD(&mqrq_cur->packed_list);
> + INIT_LIST_HEAD(&mqrq_prev->packed_list);
> mq->mqrq_cur = mqrq_cur;
> mq->mqrq_prev = mqrq_prev;
> mq->queue->queuedata = mq;
> @@ -372,6 +374,39 @@ void mmc_queue_resume(struct mmc_queue *mq)
> }
> }
>
> +static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
> + struct mmc_queue_req *mqrq,
> + struct scatterlist *sg)
> +{
> + struct scatterlist *__sg;
> + unsigned int sg_len = 0;
> + struct request *req;
> + enum mmc_packed_cmd cmd;
> +
> + cmd = mqrq->packed_cmd;
> +
> + if (cmd == MMC_PACKED_WR_HDR || cmd == MMC_PACKED_WRITE) {
> + __sg =sg;
> + sg_set_buf(__sg, mqrq->packed_cmd_hdr,
> + sizeof(mqrq->packed_cmd_hdr));
> + sg_len++;
> + if (cmd == MMC_PACKED_WR_HDR) {
> + sg_mark_end(__sg);
> + return sg_len;
> + }
> + __sg->page_link &= ~0x02;
> + }
> +
> + __sg = sg + sg_len;
> + list_for_each_entry(req, &mqrq->packed_list, queuelist) {
> + sg_len += blk_rq_map_sg(mq->queue, req, __sg);
> + __sg = sg + (sg_len - 1);
> + (__sg++)->page_link &= ~0x02;
> + }
> + sg_mark_end(sg + (sg_len - 1));
> + return sg_len;
> +}
> +
> /*
> * Prepare the sg list(s) to be handed of to the host driver
> */
> @@ -382,12 +417,19 @@ unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
> struct scatterlist *sg;
> int i;
>
> - if (!mqrq->bounce_buf)
> - return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
> + if (!mqrq->bounce_buf) {
> + if (!list_empty(&mqrq->packed_list))
> + return mmc_queue_packed_map_sg(mq, mqrq, mqrq->sg);
> + else
> + return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
> + }
>
> BUG_ON(!mqrq->bounce_sg);
>
> - sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
> + if (!list_empty(&mqrq->packed_list))
> + sg_len = mmc_queue_packed_map_sg(mq, mqrq, mqrq->bounce_sg);
> + else
> + sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
>
> mqrq->bounce_sg_len = sg_len;
>
> diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
> index d2a1eb4..5d0131e 100644
> --- a/drivers/mmc/card/queue.h
> +++ b/drivers/mmc/card/queue.h
> @@ -12,6 +12,13 @@ struct mmc_blk_request {
> struct mmc_data data;
> };
>
> +enum mmc_packed_cmd {
> + MMC_PACKED_NONE = 0,
> + MMC_PACKED_WR_HDR,
> + MMC_PACKED_WRITE,
> + MMC_PACKED_READ,
> +};
> +
> struct mmc_queue_req {
> struct request *req;
> struct mmc_blk_request brq;
> @@ -20,6 +27,11 @@ struct mmc_queue_req {
> struct scatterlist *bounce_sg;
> unsigned int bounce_sg_len;
> struct mmc_async_req mmc_active;
> + struct list_head packed_list;
> + u32 packed_cmd_hdr[128];
> + unsigned int packed_blocks;
> + enum mmc_packed_cmd packed_cmd;
> + int packed_fail_idx;
> };
>
> struct mmc_queue {
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 3627044..eab01c1 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -487,6 +487,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
> ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
> ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
> +
> + card->ext_csd.max_packed_writes = ext_csd[EXT_CSD_MAX_PACKED_WRITES];
> + card->ext_csd.max_packed_reads = ext_csd[EXT_CSD_MAX_PACKED_READS];
> }
>
> out:
> @@ -1072,6 +1075,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> card->ext_csd.cache_ctrl = err ? 0 : 1;
> }
>
> + if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
> + (card->ext_csd.max_packed_writes > 0) &&
> + (card->ext_csd.max_packed_reads > 0)) {
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_EXP_EVENTS_CTRL,
> + EXT_CSD_PACKED_EVENT_EN,
> + card->ext_csd.generic_cmd6_time);
> + if (err && err != -EBADMSG)
> + goto free_card;
> + if (err) {
> + pr_warning("%s: Enabling packed event failed\n",
> + mmc_hostname(card->host));
> + err = 0;
> + } else
> + card->ext_csd.packed_event_en = 1;
> + }
> +
> if (!oldcard)
> host->card = card;
>
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 6e04e10..3ffd93f 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -52,6 +52,9 @@ struct mmc_ext_csd {
> u8 part_config;
> u8 cache_ctrl;
> u8 rst_n_function;
> + u8 max_packed_writes;
> + u8 max_packed_reads;
> + u8 packed_event_en;
> unsigned int part_time; /* Units: ms */
> unsigned int sa_timeout; /* Units: 100ns */
> unsigned int generic_cmd6_time; /* Units: 10ms */
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index a3ac9c4..d2e4210 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -242,6 +242,7 @@ struct mmc_host {
> #define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
> #define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
> #define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
> +#define MMC_CAP2_PACKED_CMD (1 << 4) /* Allow packed command */
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
> unsigned int power_notify_type;
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 0e71356..1988780 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -138,6 +138,7 @@ static inline bool mmc_op_multi(u32 opcode)
> #define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */
> #define R1_READY_FOR_DATA (1 << 8) /* sx, a */
> #define R1_SWITCH_ERROR (1 << 7) /* sx, c */
> +#define R1_EXP_EVENT (1 << 6) /* sr, a */
> #define R1_APP_CMD (1 << 5) /* sr, c */
>
> #define R1_STATE_IDLE 0
> @@ -273,6 +274,10 @@ struct _mmc_csd {
> #define EXT_CSD_FLUSH_CACHE 32 /* W */
> #define EXT_CSD_CACHE_CTRL 33 /* R/W */
> #define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
> +#define EXT_CSD_PACKED_FAILURE_INDEX 35 /* RO */
> +#define EXT_CSD_PACKED_CMD_STATUS 36 /* RO */
> +#define EXT_CSD_EXP_EVENTS_STATUS 54 /* RO, 2 bytes */
> +#define EXT_CSD_EXP_EVENTS_CTRL 56 /* R/W, 2 bytes */
> #define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
> #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
> #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
> @@ -313,6 +318,8 @@ struct _mmc_csd {
> #define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
> #define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
> #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
> +#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
> +#define EXT_CSD_MAX_PACKED_READS 501 /* RO */
> #define EXT_CSD_HPI_FEATURES 503 /* RO */
>
> /*
> @@ -364,6 +371,14 @@ struct _mmc_csd {
> #define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
> #define EXT_CSD_PWR_CL_8BIT_SHIFT 4
> #define EXT_CSD_PWR_CL_4BIT_SHIFT 0
> +
> +#define EXT_CSD_PACKED_EVENT_EN (1<<3)
> +
> +#define EXT_CSD_PACKED_FAILURE (1<<3)
> +
> +#define EXT_CSD_PACKED_GENERIC_ERROR (1<<0)
> +#define EXT_CSD_PACKED_INDEXED_ERROR (1<<1)
> +
> /*
> * MMC_SWITCH access modes
> */
> --
> 1.7.2.3
>
It'd be helpful if you split this patch into several smaller ones for
easier review.
Also please copy linux-kernel mailing list for wider review.
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: [PATCH] mmc: core: Add packed command for eMMC4.5 device
2011-10-27 13:22 ` S, Venkatraman
@ 2011-10-28 5:44 ` Seungwon Jeon
0 siblings, 0 replies; 8+ messages in thread
From: Seungwon Jeon @ 2011-10-28 5:44 UTC (permalink / raw)
To: 'S, Venkatraman'
Cc: linux-mmc, linux-samsung-soc, linux-kernel, 'Chris Ball', dh.han
S, Venkatraman <svenkatr@ti.com> wrote:
> On Thu, Oct 27, 2011 at 4:24 PM, Seungwon Jeon <tgih.jun@samsung.com> wrote:
> > This patch supports packed command feature of eMMC4.5 Spec.
> > Several reads(or writes) can be grouped in packed command
> > and all data of the individual commands can be sent in one
> > transfer on the bus.
> >
> > Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
> > ---
> > drivers/mmc/card/block.c | 349 ++++++++++++++++++++++++++++++++++++++++++++--
> > drivers/mmc/card/queue.c | 48 ++++++-
> > drivers/mmc/card/queue.h | 12 ++
> > drivers/mmc/core/mmc.c | 20 +++
> > include/linux/mmc/card.h | 3 +
> > include/linux/mmc/host.h | 1 +
> > include/linux/mmc/mmc.h | 15 ++
> > 7 files changed, 434 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> > index 4fd5723..0258a81 100644
> > --- a/drivers/mmc/card/block.c
> > +++ b/drivers/mmc/card/block.c
> > @@ -45,6 +45,7 @@
> > #include <asm/uaccess.h>
> >
> > #include "queue.h"
> > +#include "../core/mmc_ops.h"
>
> I don't think this is the right way to include files. The core
> directory should be in the include path already.
Ok, I'll make be well-formed.
>
> >
> > MODULE_ALIAS("mmc:block");
> > #ifdef MODULE_PARAM_PREFIX
> > @@ -59,6 +60,10 @@ MODULE_ALIAS("mmc:block");
> > #define INAND_CMD38_ARG_SECTRIM1 0x81
> > #define INAND_CMD38_ARG_SECTRIM2 0x88
> >
> > +#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
> > + (req->cmd_flags & REQ_META)) && \
> > + (rq_data_dir(req) == WRITE))
> > +
> > static DEFINE_MUTEX(block_mutex);
> >
> > /*
> > @@ -943,7 +948,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
> > * kind. If it was a write, we may have transitioned to
> > * program mode, which we have to wait for it to complete.
> > */
> > - if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
> > + if ((!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) ||
> > + (mq_mrq->packed_cmd == MMC_PACKED_WR_HDR)) {
> > u32 status;
> > do {
> > int err = get_card_status(card, &status, 5);
> > @@ -980,12 +986,67 @@ static int mmc_blk_err_check(struct mmc_card *card,
> > if (!brq->data.bytes_xfered)
> > return MMC_BLK_RETRY;
> >
> > + if (mq_mrq->packed_cmd != MMC_PACKED_NONE) {
> > + if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
> > + return MMC_BLK_PARTIAL;
> > + else
> > + return MMC_BLK_SUCCESS;
> > + }
> > +
> > if (blk_rq_bytes(req) != brq->data.bytes_xfered)
> > return MMC_BLK_PARTIAL;
> >
> > return MMC_BLK_SUCCESS;
> > }
> >
> > +static int mmc_blk_packed_err_check(struct mmc_card *card,
> > + struct mmc_async_req *areq)
> > +{
> > + struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
> > + mmc_active);
> > + int err, check, status;
> > + u8 ext_csd[512];
> > +
> > + check = mmc_blk_err_check(card, areq);
> > +
> > + if (check == MMC_BLK_SUCCESS)
> > + return check;
> > +
> > + if (check == MMC_BLK_PARTIAL) {
> > + err = get_card_status(card, &status, 0);
> > + if (err)
> > + return MMC_BLK_ABORT;
> > +
> > + if (status & R1_EXP_EVENT) {
> > + err = mmc_send_ext_csd(card, ext_csd);
> > + if (err)
> > + return MMC_BLK_ABORT;
> > +
> > + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0] &
> > + EXT_CSD_PACKED_FAILURE) &&
> > + (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
> > + EXT_CSD_PACKED_GENERIC_ERROR)) {
> > + if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
> > + EXT_CSD_PACKED_INDEXED_ERROR) {
> > + /* Make be 0-based */
> > + mq_mrq->packed_fail_idx =
> > + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
> > + return MMC_BLK_PARTIAL;
> > + } else {
> > + return MMC_BLK_RETRY;
> > + }
> > + }
> > + } else {
> > + return MMC_BLK_RETRY;
> > + }
> > + }
> > +
> > + if (check != MMC_BLK_ABORT)
> > + return MMC_BLK_RETRY;
> > + else
> > + return MMC_BLK_ABORT;
> > +}
> > +
> > static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> > struct mmc_card *card,
> > int disable_multi,
> > @@ -1126,6 +1187,207 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> > mmc_queue_bounce_pre(mqrq);
> > }
> >
> > +static u8 mmc_blk_chk_packable(struct mmc_queue *mq, struct request *req)
> > +{
> > + struct request_queue *q = mq->queue;
> > + struct mmc_card *card = mq->card;
> > + struct request *cur = req, *next = NULL;
> > + struct mmc_blk_data *md = mq->data;
> > + bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
> > + unsigned int req_sectors = 0, phys_segments = 0;
> > + unsigned int max_blk_count, max_phys_segs;
> > + u8 max_packed_rw = 0;
> > + u8 reqs = 0;
> > +
> > + if (!(md->flags & MMC_BLK_CMD23) &&
> > + !card->ext_csd.packed_event_en)
> > + goto no_packed;
> > +
> > + if (rq_data_dir(cur) == READ)
> > + max_packed_rw = card->ext_csd.max_packed_reads;
> > + else
> > + max_packed_rw = card->ext_csd.max_packed_writes;
> > +
> > + if (max_packed_rw == 0)
> > + goto no_packed;
> > +
> > + if (mmc_req_rel_wr(cur) &&
> > + (md->flags & MMC_BLK_REL_WR) &&
> > + !en_rel_wr) {
> > + goto no_packed;
> > + }
> > +
> > + max_blk_count = min(card->host->max_blk_count,
> > + card->host->max_req_size >> 9);
> > + max_phys_segs = queue_max_segments(q);
> > + req_sectors += blk_rq_sectors(cur);
> > + phys_segments += req->nr_phys_segments;
> > +
> > + if (rq_data_dir(cur) == WRITE) {
> > + req_sectors++;
> > + phys_segments++;
> > + }
> > +
> > + while (reqs < max_packed_rw - 1) {
> > + next = blk_fetch_request(q);
> > + if (!next)
> > + break;
> > +
> > + if (rq_data_dir(cur) != rq_data_dir(next)) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + if (mmc_req_rel_wr(next) &&
> > + (md->flags & MMC_BLK_REL_WR) &&
> > + !en_rel_wr) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + req_sectors += blk_rq_sectors(next);
> > + if (req_sectors > max_blk_count) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + phys_segments += next->nr_phys_segments;
> > + if (phys_segments > max_phys_segs) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
> > + cur = next;
> > + reqs++;
> > + }
>
> IIRC, blk_fetch_request gets it from the top of the request_queue and
> blk_requeue_request puts it back to the top of the queue
> (request_queue->queue_head). Hence, possibly, this loop will keep
> fetching and requeing the same request repeatedly ?
Right. If fetched request is not packable to previous requests,
then it will be queued to top of request_queue.
>
>
> > +
> > + if (reqs > 0) {
> > + list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
> > + return (reqs + 1);
> > + }
> > +
> > +no_packed:
> > + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
> > + return reqs;
> > +}
> > +
> > +static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
> > + struct mmc_card *card,
> > + struct mmc_queue *mq,
> > + u8 reqs)
> > +{
> > + struct mmc_blk_request *brq = &mqrq->brq;
> > + struct request *req = mqrq->req;
> > + struct request *prq;
> > + struct mmc_blk_data *md = mq->data;
> > + bool do_rel_wr;
> > + u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
> > + u8 i =1;
> > +
> > + mqrq->packed_cmd = (rq_data_dir(req) == READ) ?
> > + MMC_PACKED_WR_HDR : MMC_PACKED_WRITE;
> > + mqrq->packed_blocks = 0;
> > + mqrq->packed_fail_idx = -1;
> > +
> > + memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
> > + packed_cmd_hdr[0] = (reqs << 16) |
> > + (((rq_data_dir(req) == READ) ? 0x01 : 0x02) << 8) | (0x01 << 0);
> > +
> Too many magic numbers here.
Ok. It will be modified.
>
> > + /*
> > + * Argument for each entry of packed group
> > + */
> > + list_for_each_entry(prq, &mqrq->packed_list, queuelist) {
> > + do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
> > + /* Argument of CMD23*/
> > + packed_cmd_hdr[(i * 2)] = (do_rel_wr ? (1 << 31) : 0) |
> > + blk_rq_sectors(prq);
> > + /* Argument of CMD18 or CMD25 */
> > + packed_cmd_hdr[((i * 2)) + 1] = mmc_card_blockaddr(card) ?
> > + blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
> > + mqrq->packed_blocks += blk_rq_sectors(prq);
> > + i++;
> > + }
> > +
> > + memset(brq, 0, sizeof(struct mmc_blk_request));
> > + brq->mrq.cmd = &brq->cmd;
> > + brq->mrq.data = &brq->data;
> > + brq->mrq.sbc = &brq->sbc;
> > + brq->mrq.stop = &brq->stop;
> > +
> > + brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
> > + brq->sbc.arg = (0 << 31) | (1 << 30) |
> > + ((rq_data_dir(req) == READ) ? 1 : mqrq->packed_blocks + 1);
>
> .. and here ^^..
>
> > + brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
> > +
> > + brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
> > + brq->cmd.arg = blk_rq_pos(req);
> > + if (!mmc_card_blockaddr(card))
> > + brq->cmd.arg <<= 9;
> > + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> > +
> > + brq->data.blksz = 512;
> > + /*
> > + * Write separately the packd command header only for packed read.
> > + * In case of packed write, header is sent with blocks of data.
> > + */
> > + brq->data.blocks = (rq_data_dir(req) == READ) ?
> > + 1 : mqrq->packed_blocks + 1;
> > + brq->data.flags |= MMC_DATA_WRITE;
> > +
> > + brq->stop.opcode = MMC_STOP_TRANSMISSION;
> > + brq->stop.arg = 0;
> > + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> > +
> > + mmc_set_data_timeout(&brq->data, card);
> > +
> > + brq->data.sg = mqrq->sg;
> > + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
> > +
> > + mqrq->mmc_active.mrq = &brq->mrq;
> > + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
> > +
> > + mmc_queue_bounce_pre(mqrq);
> > +}
> > +
> > +static void mmc_blk_packed_rrq_prep(struct mmc_queue_req *mqrq,
> > + struct mmc_card *card,
> > + struct mmc_queue *mq)
> > +{
> > + struct mmc_blk_request *brq = &mqrq->brq;
> > + struct request *req = mqrq->req;
> > +
> > + mqrq->packed_cmd = MMC_PACKED_READ;
> > +
> > + memset(brq, 0, sizeof(struct mmc_blk_request));
> > + brq->mrq.cmd = &brq->cmd;
> > + brq->mrq.data = &brq->data;
> > + brq->mrq.stop = &brq->stop;
> > +
> > + brq->cmd.opcode = MMC_READ_MULTIPLE_BLOCK;
> > + brq->cmd.arg = blk_rq_pos(req);
> > + if (!mmc_card_blockaddr(card))
> > + brq->cmd.arg <<= 9;
> > + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> > + brq->data.blksz = 512;
> > + brq->data.blocks = mqrq->packed_blocks;
> > + brq->data.flags |= MMC_DATA_READ;
> > +
> > + brq->stop.opcode = MMC_STOP_TRANSMISSION;
> > + brq->stop.arg = 0;
> > + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> > +
> > + mmc_set_data_timeout(&brq->data, card);
> > +
> > + brq->data.sg = mqrq->sg;
> > + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
> > +
> > + mqrq->mmc_active.mrq = &brq->mrq;
> > + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
> > +
> > + mmc_queue_bounce_pre(mqrq);
> > +}
> > +
> > static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
> > struct mmc_blk_request *brq, struct request *req,
> > int ret)
> > @@ -1163,15 +1425,33 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > int ret = 1, disable_multi = 0, retry = 0, type;
> > enum mmc_blk_status status;
> > struct mmc_queue_req *mq_rq;
> > - struct request *req;
> > + struct request *req, *prq;
> > struct mmc_async_req *areq;
> > + u8 reqs = 0;
> >
> > if (!rqc && !mq->mqrq_prev->req)
> > return 0;
> >
> > + if (rqc)
> > + reqs = mmc_blk_chk_packable(mq, rqc);
> > +
> > do {
> > if (rqc) {
> > - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> > + if (reqs >= 2) {
> > + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> > + if (rq_data_dir(rqc) == READ) {
> > + areq = &mq->mqrq_cur->mmc_active;
> > + mmc_wait_for_req(card->host, areq->mrq);
> > + status = mmc_blk_packed_err_check(card, areq);
> > + if (status == MMC_BLK_SUCCESS) {
> > + mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
> > + } else {
> > + goto check_status;
> > + }
> > + }
> > + } else {
> > + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> > + }
> > areq = &mq->mqrq_cur->mmc_active;
> > } else
> > areq = NULL;
> > @@ -1179,6 +1459,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > if (!areq)
> > return 0;
> >
> > +check_status:
> > mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
> > brq = &mq_rq->brq;
> > req = mq_rq->req;
> > @@ -1192,10 +1473,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > * A block was successfully transferred.
> > */
> > mmc_blk_reset_success(md, type);
> > - spin_lock_irq(&md->lock);
> > - ret = __blk_end_request(req, 0,
> > +
> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> > + int idx = mq_rq->packed_fail_idx, i = 0;
> > + while (!list_empty(&mq_rq->packed_list)) {
> > + prq = list_entry_rq(mq_rq->packed_list.next);
> > + if (idx == i) {
> > + /* retry from error index */
> > + reqs -= idx;
> > + mq_rq->req = prq;
> > + ret = 1;
> > + break;
> > + }
> > + list_del_init(&prq->queuelist);
> > + spin_lock_irq(&md->lock);
> > + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
> > + spin_unlock_irq(&md->lock);
> > + i++;
> > + }
> > + break;
> > + } else {
> > + spin_lock_irq(&md->lock);
> > + ret = __blk_end_request(req, 0,
> > brq->data.bytes_xfered);
> > - spin_unlock_irq(&md->lock);
> > + spin_unlock_irq(&md->lock);
> > + }
> > +
> > /*
> > * If the blk_end_request function returns non-zero even
> > * though all data has been transferred and no errors
> > @@ -1254,7 +1557,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > break;
> > }
> >
> > - if (ret) {
> > + if (ret && (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
> > /*
> > * In case of a incomplete request
> > * prepare it again and resend.
> > @@ -1267,13 +1570,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > return 1;
> >
> > cmd_abort:
> > - spin_lock_irq(&md->lock);
> > - while (ret)
> > - ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> > - spin_unlock_irq(&md->lock);
> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> > + spin_lock_irq(&md->lock);
> > + while (ret)
> > + ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> > + spin_unlock_irq(&md->lock);
> > + } else {
> > + while (!list_empty(&mq_rq->packed_list)) {
> > + prq = list_entry_rq(mq_rq->packed_list.next);
> > + list_del_init(&prq->queuelist);
> > + spin_lock_irq(&md->lock);
> > + __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
> > + spin_unlock_irq(&md->lock);
> > + }
> > + }
> >
> > start_new_req:
> > if (rqc) {
> > + /*
> > + * If current request is packed, it need to put back.
> > + */
> > + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
> > + while (!list_empty(&mq->mqrq_cur->packed_list)) {
> > + prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
> > + if (prq->queuelist.prev != &mq->mqrq_cur->packed_list) {
> > + list_del_init(&prq->queuelist);
> > + blk_requeue_request(mq->queue, prq);
> > + } else {
> > + list_del_init(&prq->queuelist);
> > + }
> > + }
> > + }
> > mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> > mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
> > }
> > diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> > index dcad59c..3a4542e 100644
> > --- a/drivers/mmc/card/queue.c
> > +++ b/drivers/mmc/card/queue.c
> > @@ -172,6 +172,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
> >
> > memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
> > memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
> > + INIT_LIST_HEAD(&mqrq_cur->packed_list);
> > + INIT_LIST_HEAD(&mqrq_prev->packed_list);
> > mq->mqrq_cur = mqrq_cur;
> > mq->mqrq_prev = mqrq_prev;
> > mq->queue->queuedata = mq;
> > @@ -372,6 +374,39 @@ void mmc_queue_resume(struct mmc_queue *mq)
> > }
> > }
> >
> > +static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
> > + struct mmc_queue_req *mqrq,
> > + struct scatterlist *sg)
> > +{
> > + struct scatterlist *__sg;
> > + unsigned int sg_len = 0;
> > + struct request *req;
> > + enum mmc_packed_cmd cmd;
> > +
> > + cmd = mqrq->packed_cmd;
> > +
> > + if (cmd == MMC_PACKED_WR_HDR || cmd == MMC_PACKED_WRITE) {
> > + __sg =sg;
> > + sg_set_buf(__sg, mqrq->packed_cmd_hdr,
> > + sizeof(mqrq->packed_cmd_hdr));
> > + sg_len++;
> > + if (cmd == MMC_PACKED_WR_HDR) {
> > + sg_mark_end(__sg);
> > + return sg_len;
> > + }
> > + __sg->page_link &= ~0x02;
> > + }
> > +
> > + __sg = sg + sg_len;
> > + list_for_each_entry(req, &mqrq->packed_list, queuelist) {
> > + sg_len += blk_rq_map_sg(mq->queue, req, __sg);
> > + __sg = sg + (sg_len - 1);
> > + (__sg++)->page_link &= ~0x02;
> > + }
> > + sg_mark_end(sg + (sg_len - 1));
> > + return sg_len;
> > +}
> > +
> > /*
> > * Prepare the sg list(s) to be handed of to the host driver
> > */
> > @@ -382,12 +417,19 @@ unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
> > struct scatterlist *sg;
> > int i;
> >
> > - if (!mqrq->bounce_buf)
> > - return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
> > + if (!mqrq->bounce_buf) {
> > + if (!list_empty(&mqrq->packed_list))
> > + return mmc_queue_packed_map_sg(mq, mqrq, mqrq->sg);
> > + else
> > + return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
> > + }
> >
> > BUG_ON(!mqrq->bounce_sg);
> >
> > - sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
> > + if (!list_empty(&mqrq->packed_list))
> > + sg_len = mmc_queue_packed_map_sg(mq, mqrq, mqrq->bounce_sg);
> > + else
> > + sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
> >
> > mqrq->bounce_sg_len = sg_len;
> >
> > diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
> > index d2a1eb4..5d0131e 100644
> > --- a/drivers/mmc/card/queue.h
> > +++ b/drivers/mmc/card/queue.h
> > @@ -12,6 +12,13 @@ struct mmc_blk_request {
> > struct mmc_data data;
> > };
> >
> > +enum mmc_packed_cmd {
> > + MMC_PACKED_NONE = 0,
> > + MMC_PACKED_WR_HDR,
> > + MMC_PACKED_WRITE,
> > + MMC_PACKED_READ,
> > +};
> > +
> > struct mmc_queue_req {
> > struct request *req;
> > struct mmc_blk_request brq;
> > @@ -20,6 +27,11 @@ struct mmc_queue_req {
> > struct scatterlist *bounce_sg;
> > unsigned int bounce_sg_len;
> > struct mmc_async_req mmc_active;
> > + struct list_head packed_list;
> > + u32 packed_cmd_hdr[128];
> > + unsigned int packed_blocks;
> > + enum mmc_packed_cmd packed_cmd;
> > + int packed_fail_idx;
> > };
> >
> > struct mmc_queue {
> > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> > index 3627044..eab01c1 100644
> > --- a/drivers/mmc/core/mmc.c
> > +++ b/drivers/mmc/core/mmc.c
> > @@ -487,6 +487,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> > ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
> > ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
> > ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
> > +
> > + card->ext_csd.max_packed_writes = ext_csd[EXT_CSD_MAX_PACKED_WRITES];
> > + card->ext_csd.max_packed_reads = ext_csd[EXT_CSD_MAX_PACKED_READS];
> > }
> >
> > out:
> > @@ -1072,6 +1075,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > card->ext_csd.cache_ctrl = err ? 0 : 1;
> > }
> >
> > + if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
> > + (card->ext_csd.max_packed_writes > 0) &&
> > + (card->ext_csd.max_packed_reads > 0)) {
> > + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > + EXT_CSD_EXP_EVENTS_CTRL,
> > + EXT_CSD_PACKED_EVENT_EN,
> > + card->ext_csd.generic_cmd6_time);
> > + if (err && err != -EBADMSG)
> > + goto free_card;
> > + if (err) {
> > + pr_warning("%s: Enabling packed event failed\n",
> > + mmc_hostname(card->host));
> > + err = 0;
> > + } else
> > + card->ext_csd.packed_event_en = 1;
> > + }
> > +
> > if (!oldcard)
> > host->card = card;
> >
> > diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> > index 6e04e10..3ffd93f 100644
> > --- a/include/linux/mmc/card.h
> > +++ b/include/linux/mmc/card.h
> > @@ -52,6 +52,9 @@ struct mmc_ext_csd {
> > u8 part_config;
> > u8 cache_ctrl;
> > u8 rst_n_function;
> > + u8 max_packed_writes;
> > + u8 max_packed_reads;
> > + u8 packed_event_en;
> > unsigned int part_time; /* Units: ms */
> > unsigned int sa_timeout; /* Units: 100ns */
> > unsigned int generic_cmd6_time; /* Units: 10ms */
> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> > index a3ac9c4..d2e4210 100644
> > --- a/include/linux/mmc/host.h
> > +++ b/include/linux/mmc/host.h
> > @@ -242,6 +242,7 @@ struct mmc_host {
> > #define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
> > #define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
> > #define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
> > +#define MMC_CAP2_PACKED_CMD (1 << 4) /* Allow packed command */
> >
> > mmc_pm_flag_t pm_caps; /* supported pm features */
> > unsigned int power_notify_type;
> > diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> > index 0e71356..1988780 100644
> > --- a/include/linux/mmc/mmc.h
> > +++ b/include/linux/mmc/mmc.h
> > @@ -138,6 +138,7 @@ static inline bool mmc_op_multi(u32 opcode)
> > #define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */
> > #define R1_READY_FOR_DATA (1 << 8) /* sx, a */
> > #define R1_SWITCH_ERROR (1 << 7) /* sx, c */
> > +#define R1_EXP_EVENT (1 << 6) /* sr, a */
> > #define R1_APP_CMD (1 << 5) /* sr, c */
> >
> > #define R1_STATE_IDLE 0
> > @@ -273,6 +274,10 @@ struct _mmc_csd {
> > #define EXT_CSD_FLUSH_CACHE 32 /* W */
> > #define EXT_CSD_CACHE_CTRL 33 /* R/W */
> > #define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
> > +#define EXT_CSD_PACKED_FAILURE_INDEX 35 /* RO */
> > +#define EXT_CSD_PACKED_CMD_STATUS 36 /* RO */
> > +#define EXT_CSD_EXP_EVENTS_STATUS 54 /* RO, 2 bytes */
> > +#define EXT_CSD_EXP_EVENTS_CTRL 56 /* R/W, 2 bytes */
> > #define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
> > #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
> > #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
> > @@ -313,6 +318,8 @@ struct _mmc_csd {
> > #define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
> > #define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
> > #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
> > +#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
> > +#define EXT_CSD_MAX_PACKED_READS 501 /* RO */
> > #define EXT_CSD_HPI_FEATURES 503 /* RO */
> >
> > /*
> > @@ -364,6 +371,14 @@ struct _mmc_csd {
> > #define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
> > #define EXT_CSD_PWR_CL_8BIT_SHIFT 4
> > #define EXT_CSD_PWR_CL_4BIT_SHIFT 0
> > +
> > +#define EXT_CSD_PACKED_EVENT_EN (1<<3)
> > +
> > +#define EXT_CSD_PACKED_FAILURE (1<<3)
> > +
> > +#define EXT_CSD_PACKED_GENERIC_ERROR (1<<0)
> > +#define EXT_CSD_PACKED_INDEXED_ERROR (1<<1)
> > +
> > /*
> > * MMC_SWITCH access modes
> > */
> > --
> > 1.7.2.3
> >
>
> It'd be helpful if you split this patch into several smaller ones for
> easier review.
> Also please copy linux-kernel mailing list for wider review.
split path... I'll consider it, if possible.
Thank you for review.
Best regards,
Seungwon Jeon.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mmc: core: Add packed command for eMMC4.5 device
2011-10-27 10:54 [PATCH] mmc: core: Add packed command for eMMC4.5 device Seungwon Jeon
2011-10-27 13:22 ` S, Venkatraman
@ 2011-11-16 11:15 ` Sahitya Tummala
2011-11-17 9:20 ` Seungwon Jeon
1 sibling, 1 reply; 8+ messages in thread
From: Sahitya Tummala @ 2011-11-16 11:15 UTC (permalink / raw)
To: Seungwon Jeon; +Cc: linux-mmc, linux-samsung-soc, Chris Ball, dh.han
Hi,
On 10/27/2011 4:24 PM, Seungwon Jeon wrote:
>
> +static int mmc_blk_packed_err_check(struct mmc_card *card,
> + struct mmc_async_req *areq)
> +{
> + struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
> + mmc_active);
> + int err, check, status;
> + u8 ext_csd[512];
> +
> + check = mmc_blk_err_check(card, areq);
> +
> + if (check == MMC_BLK_SUCCESS)
> + return check;
> +
> + if (check == MMC_BLK_PARTIAL) {
> + err = get_card_status(card,&status, 0);
> + if (err)
> + return MMC_BLK_ABORT;
> +
> + if (status& R1_EXP_EVENT) {
> + err = mmc_send_ext_csd(card, ext_csd);
> + if (err)
> + return MMC_BLK_ABORT;
> +
> + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0]&
> + EXT_CSD_PACKED_FAILURE)&&
> + (ext_csd[EXT_CSD_PACKED_CMD_STATUS]&
> + EXT_CSD_PACKED_GENERIC_ERROR)) {
> + if (ext_csd[EXT_CSD_PACKED_CMD_STATUS]&
> + EXT_CSD_PACKED_INDEXED_ERROR) {
> + /* Make be 0-based */
> + mq_mrq->packed_fail_idx =
> + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
> + return MMC_BLK_PARTIAL;
> + } else {
> + return MMC_BLK_RETRY;
> + }
> + }
> + } else {
> + return MMC_BLK_RETRY;
> + }
> + }
> +
> + if (check != MMC_BLK_ABORT)
> + return MMC_BLK_RETRY;
> + else
> + return MMC_BLK_ABORT;
The current code does not return other errors (MMC_BLK_CMD_ERR,
MMC_BLK_ECC_ERR and MMC_BLK_DATA_ERR) returned by mmc_blk_err_check().
Why not return check here?
> +}
> +
> static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> struct mmc_card *card,
> int disable_multi,
> @@ -1126,6 +1187,207 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> mmc_queue_bounce_pre(mqrq);
> }
>
> +static u8 mmc_blk_chk_packable(struct mmc_queue *mq, struct request *req)
> +{
> + struct request_queue *q = mq->queue;
> + struct mmc_card *card = mq->card;
> + struct request *cur = req, *next = NULL;
> + struct mmc_blk_data *md = mq->data;
> + bool en_rel_wr = card->ext_csd.rel_param& EXT_CSD_WR_REL_PARAM_EN;
> + unsigned int req_sectors = 0, phys_segments = 0;
> + unsigned int max_blk_count, max_phys_segs;
> + u8 max_packed_rw = 0;
> + u8 reqs = 0;
> +
> + if (!(md->flags& MMC_BLK_CMD23)&&
> + !card->ext_csd.packed_event_en)
> + goto no_packed;
> +
> + if (rq_data_dir(cur) == READ)
> + max_packed_rw = card->ext_csd.max_packed_reads;
> + else
> + max_packed_rw = card->ext_csd.max_packed_writes;
> +
> + if (max_packed_rw == 0)
> + goto no_packed;
> +
> + if (mmc_req_rel_wr(cur)&&
> + (md->flags& MMC_BLK_REL_WR)&&
> + !en_rel_wr) {
> + goto no_packed;
> + }
> +
> + max_blk_count = min(card->host->max_blk_count,
> + card->host->max_req_size>> 9);
> + max_phys_segs = queue_max_segments(q);
> + req_sectors += blk_rq_sectors(cur);
> + phys_segments += req->nr_phys_segments;
> +
> + if (rq_data_dir(cur) == WRITE) {
> + req_sectors++;
> + phys_segments++;
> + }
> +
> + while (reqs< max_packed_rw - 1) {
What if the number of requests exceeds the packed header size defined?
> + next = blk_fetch_request(q);
> + if (!next)
> + break;
> +
> + if (rq_data_dir(cur) != rq_data_dir(next)) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + if (mmc_req_rel_wr(next)&&
> + (md->flags& MMC_BLK_REL_WR)&&
> + !en_rel_wr) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + req_sectors += blk_rq_sectors(next);
> + if (req_sectors> max_blk_count) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + phys_segments += next->nr_phys_segments;
> + if (phys_segments> max_phys_segs) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + list_add_tail(&next->queuelist,&mq->mqrq_cur->packed_list);
> + cur = next;
> + reqs++;
> + }
> +
> + if (reqs> 0) {
> + list_add(&req->queuelist,&mq->mqrq_cur->packed_list);
> + return (reqs + 1);
> + }
> +
> +no_packed:
> + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
> + return reqs;
> +}
> +
>
> static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
> struct mmc_blk_request *brq, struct request *req,
> int ret)
> @@ -1163,15 +1425,33 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> int ret = 1, disable_multi = 0, retry = 0, type;
> enum mmc_blk_status status;
> struct mmc_queue_req *mq_rq;
> - struct request *req;
> + struct request *req, *prq;
> struct mmc_async_req *areq;
> + u8 reqs = 0;
>
> if (!rqc&& !mq->mqrq_prev->req)
> return 0;
>
> + if (rqc)
> + reqs = mmc_blk_chk_packable(mq, rqc);
> +
> do {
> if (rqc) {
> - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> + if (reqs>= 2) {
> + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> + if (rq_data_dir(rqc) == READ) {
> + areq =&mq->mqrq_cur->mmc_active;
> + mmc_wait_for_req(card->host, areq->mrq);
> + status = mmc_blk_packed_err_check(card, areq);
> + if (status == MMC_BLK_SUCCESS) {
> + mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
> + } else {
> + goto check_status;
> + }
> + }
> + } else {
> + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
We must use disable_multi variable instead of directly calling this
function with 0 value because there are some cases where disable_multi
is set to 1 (for example, it is set for error case MMC_BLK_ECC_ERR).
> + }
> areq =&mq->mqrq_cur->mmc_active;
> } else
> areq = NULL;
> @@ -1179,6 +1459,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> if (!areq)
> return 0;
>
> +check_status:
> mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
> brq =&mq_rq->brq;
> req = mq_rq->req;
> @@ -1192,10 +1473,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> * A block was successfully transferred.
> */
> mmc_blk_reset_success(md, type);
> - spin_lock_irq(&md->lock);
> - ret = __blk_end_request(req, 0,
> +
> + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> + int idx = mq_rq->packed_fail_idx, i = 0;
> + while (!list_empty(&mq_rq->packed_list)) {
> + prq = list_entry_rq(mq_rq->packed_list.next);
> + if (idx == i) {
> + /* retry from error index */
> + reqs -= idx;
> + mq_rq->req = prq;
> + ret = 1;
> + break;
> + }
> + list_del_init(&prq->queuelist);
> + spin_lock_irq(&md->lock);
> + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
> + spin_unlock_irq(&md->lock);
> + i++;
> + }
> + break;
> + } else {
> + spin_lock_irq(&md->lock);
> + ret = __blk_end_request(req, 0,
> brq->data.bytes_xfered);
> - spin_unlock_irq(&md->lock);
> + spin_unlock_irq(&md->lock);
> + }
> +
> /*
> * If the blk_end_request function returns non-zero even
> * though all data has been transferred and no errors
> @@ -1254,7 +1557,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> break;
> }
>
> - if (ret) {
> + if (ret&& (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
> /*
> * In case of a incomplete request
> * prepare it again and resend.
> @@ -1267,13 +1570,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> return 1;
>
> cmd_abort:
> - spin_lock_irq(&md->lock);
> - while (ret)
> - ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> - spin_unlock_irq(&md->lock);
> + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> + spin_lock_irq(&md->lock);
> + while (ret)
> + ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> + spin_unlock_irq(&md->lock);
> + } else {
> + while (!list_empty(&mq_rq->packed_list)) {
> + prq = list_entry_rq(mq_rq->packed_list.next);
> + list_del_init(&prq->queuelist);
> + spin_lock_irq(&md->lock);
> + __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
> + spin_unlock_irq(&md->lock);
> + }
> + }
>
> start_new_req:
> if (rqc) {
> + /*
> + * If current request is packed, it need to put back.
> + */
> + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
> + while (!list_empty(&mq->mqrq_cur->packed_list)) {
> + prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
> + if (prq->queuelist.prev !=&mq->mqrq_cur->packed_list) {
> + list_del_init(&prq->queuelist);
> + blk_requeue_request(mq->queue, prq);
> + } else {
> + list_del_init(&prq->queuelist);
> + }
> + }
> + }
> mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
We must use disable_multi variable instead of directly calling this
function with 0 value because there are some cases where disable_multi
is set to 1.
> mmc_start_req(card->host,&mq->mqrq_cur->mmc_active, NULL);
I think these two statements must come under else part of above if
condition. Please check.
Thanks,
Sahitya.
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
Forum.
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: [PATCH] mmc: core: Add packed command for eMMC4.5 device
2011-11-16 11:15 ` Sahitya Tummala
@ 2011-11-17 9:20 ` Seungwon Jeon
0 siblings, 0 replies; 8+ messages in thread
From: Seungwon Jeon @ 2011-11-17 9:20 UTC (permalink / raw)
To: 'Sahitya Tummala'
Cc: linux-mmc, linux-samsung-soc, 'Chris Ball', dh.han
Sahitya Tummala wrote:
> Hi,
>
> On 10/27/2011 4:24 PM, Seungwon Jeon wrote:
> >
> > +static int mmc_blk_packed_err_check(struct mmc_card *card,
> > + struct mmc_async_req *areq)
> > +{
> > + struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
> > + mmc_active);
> > + int err, check, status;
> > + u8 ext_csd[512];
> > +
> > + check = mmc_blk_err_check(card, areq);
> > +
> > + if (check == MMC_BLK_SUCCESS)
> > + return check;
> > +
> > + if (check == MMC_BLK_PARTIAL) {
> > + err = get_card_status(card,&status, 0);
> > + if (err)
> > + return MMC_BLK_ABORT;
> > +
> > + if (status& R1_EXP_EVENT) {
> > + err = mmc_send_ext_csd(card, ext_csd);
> > + if (err)
> > + return MMC_BLK_ABORT;
> > +
> > + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0]&
> > + EXT_CSD_PACKED_FAILURE)&&
> > + (ext_csd[EXT_CSD_PACKED_CMD_STATUS]&
> > + EXT_CSD_PACKED_GENERIC_ERROR)) {
> > + if (ext_csd[EXT_CSD_PACKED_CMD_STATUS]&
> > + EXT_CSD_PACKED_INDEXED_ERROR) {
> > + /* Make be 0-based */
> > + mq_mrq->packed_fail_idx =
> > + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
> > + return MMC_BLK_PARTIAL;
> > + } else {
> > + return MMC_BLK_RETRY;
> > + }
> > + }
> > + } else {
> > + return MMC_BLK_RETRY;
> > + }
> > + }
> > +
> > + if (check != MMC_BLK_ABORT)
> > + return MMC_BLK_RETRY;
> > + else
> > + return MMC_BLK_ABORT;
>
> The current code does not return other errors (MMC_BLK_CMD_ERR,
> MMC_BLK_ECC_ERR and MMC_BLK_DATA_ERR) returned by mmc_blk_err_check().
> Why not return check here?
Currently retry is taken in case of other errors.
But some case needs to be split.
>
> > +}
> > +
> > static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> > struct mmc_card *card,
> > int disable_multi,
> > @@ -1126,6 +1187,207 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> > mmc_queue_bounce_pre(mqrq);
> > }
> >
> > +static u8 mmc_blk_chk_packable(struct mmc_queue *mq, struct request *req)
> > +{
> > + struct request_queue *q = mq->queue;
> > + struct mmc_card *card = mq->card;
> > + struct request *cur = req, *next = NULL;
> > + struct mmc_blk_data *md = mq->data;
> > + bool en_rel_wr = card->ext_csd.rel_param& EXT_CSD_WR_REL_PARAM_EN;
> > + unsigned int req_sectors = 0, phys_segments = 0;
> > + unsigned int max_blk_count, max_phys_segs;
> > + u8 max_packed_rw = 0;
> > + u8 reqs = 0;
> > +
> > + if (!(md->flags& MMC_BLK_CMD23)&&
> > + !card->ext_csd.packed_event_en)
> > + goto no_packed;
> > +
> > + if (rq_data_dir(cur) == READ)
> > + max_packed_rw = card->ext_csd.max_packed_reads;
> > + else
> > + max_packed_rw = card->ext_csd.max_packed_writes;
> > +
> > + if (max_packed_rw == 0)
> > + goto no_packed;
> > +
> > + if (mmc_req_rel_wr(cur)&&
> > + (md->flags& MMC_BLK_REL_WR)&&
> > + !en_rel_wr) {
> > + goto no_packed;
> > + }
> > +
> > + max_blk_count = min(card->host->max_blk_count,
> > + card->host->max_req_size>> 9);
> > + max_phys_segs = queue_max_segments(q);
> > + req_sectors += blk_rq_sectors(cur);
> > + phys_segments += req->nr_phys_segments;
> > +
> > + if (rq_data_dir(cur) == WRITE) {
> > + req_sectors++;
> > + phys_segments++;
> > + }
> > +
> > + while (reqs< max_packed_rw - 1) {
>
> What if the number of requests exceeds the packed header size defined?
Currently not considered.
That case is maximum r/w depth from eMMC device is wrong, right?
It may not happen in practice. But the limit may need to restricted.
>
> > + next = blk_fetch_request(q);
> > + if (!next)
> > + break;
> > +
> > + if (rq_data_dir(cur) != rq_data_dir(next)) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + if (mmc_req_rel_wr(next)&&
> > + (md->flags& MMC_BLK_REL_WR)&&
> > + !en_rel_wr) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + req_sectors += blk_rq_sectors(next);
> > + if (req_sectors> max_blk_count) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + phys_segments += next->nr_phys_segments;
> > + if (phys_segments> max_phys_segs) {
> > + blk_requeue_request(q, next);
> > + break;
> > + }
> > +
> > + list_add_tail(&next->queuelist,&mq->mqrq_cur->packed_list);
> > + cur = next;
> > + reqs++;
> > + }
> > +
> > + if (reqs> 0) {
> > + list_add(&req->queuelist,&mq->mqrq_cur->packed_list);
> > + return (reqs + 1);
> > + }
> > +
> > +no_packed:
> > + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
> > + return reqs;
> > +}
> > +
> >
> > static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
> > struct mmc_blk_request *brq, struct request *req,
> > int ret)
> > @@ -1163,15 +1425,33 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > int ret = 1, disable_multi = 0, retry = 0, type;
> > enum mmc_blk_status status;
> > struct mmc_queue_req *mq_rq;
> > - struct request *req;
> > + struct request *req, *prq;
> > struct mmc_async_req *areq;
> > + u8 reqs = 0;
> >
> > if (!rqc&& !mq->mqrq_prev->req)
> > return 0;
> >
> > + if (rqc)
> > + reqs = mmc_blk_chk_packable(mq, rqc);
> > +
> > do {
> > if (rqc) {
> > - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> > + if (reqs>= 2) {
> > + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> > + if (rq_data_dir(rqc) == READ) {
> > + areq =&mq->mqrq_cur->mmc_active;
> > + mmc_wait_for_req(card->host, areq->mrq);
> > + status = mmc_blk_packed_err_check(card, areq);
> > + if (status == MMC_BLK_SUCCESS) {
> > + mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
> > + } else {
> > + goto check_status;
> > + }
> > + }
> > + } else {
> > + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
>
> We must use disable_multi variable instead of directly calling this
> function with 0 value because there are some cases where disable_multi
> is set to 1 (for example, it is set for error case MMC_BLK_ECC_ERR).
This part is origin code for non-packed case.
It just is moved to else statement.
if (rqc) {
- mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
>
> > + }
> > areq =&mq->mqrq_cur->mmc_active;
> > } else
> > areq = NULL;
> > @@ -1179,6 +1459,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > if (!areq)
> > return 0;
> >
> > +check_status:
> > mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
> > brq =&mq_rq->brq;
> > req = mq_rq->req;
> > @@ -1192,10 +1473,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > * A block was successfully transferred.
> > */
> > mmc_blk_reset_success(md, type);
> > - spin_lock_irq(&md->lock);
> > - ret = __blk_end_request(req, 0,
> > +
> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> > + int idx = mq_rq->packed_fail_idx, i = 0;
> > + while (!list_empty(&mq_rq->packed_list)) {
> > + prq = list_entry_rq(mq_rq->packed_list.next);
> > + if (idx == i) {
> > + /* retry from error index */
> > + reqs -= idx;
> > + mq_rq->req = prq;
> > + ret = 1;
> > + break;
> > + }
> > + list_del_init(&prq->queuelist);
> > + spin_lock_irq(&md->lock);
> > + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
> > + spin_unlock_irq(&md->lock);
> > + i++;
> > + }
> > + break;
> > + } else {
> > + spin_lock_irq(&md->lock);
> > + ret = __blk_end_request(req, 0,
> > brq->data.bytes_xfered);
> > - spin_unlock_irq(&md->lock);
> > + spin_unlock_irq(&md->lock);
> > + }
> > +
> > /*
> > * If the blk_end_request function returns non-zero even
> > * though all data has been transferred and no errors
> > @@ -1254,7 +1557,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > break;
> > }
> >
> > - if (ret) {
> > + if (ret&& (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
> > /*
> > * In case of a incomplete request
> > * prepare it again and resend.
> > @@ -1267,13 +1570,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> > return 1;
> >
> > cmd_abort:
> > - spin_lock_irq(&md->lock);
> > - while (ret)
> > - ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> > - spin_unlock_irq(&md->lock);
> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> > + spin_lock_irq(&md->lock);
> > + while (ret)
> > + ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> > + spin_unlock_irq(&md->lock);
> > + } else {
> > + while (!list_empty(&mq_rq->packed_list)) {
> > + prq = list_entry_rq(mq_rq->packed_list.next);
> > + list_del_init(&prq->queuelist);
> > + spin_lock_irq(&md->lock);
> > + __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
> > + spin_unlock_irq(&md->lock);
> > + }
> > + }
> >
> > start_new_req:
> > if (rqc) {
> > + /*
> > + * If current request is packed, it need to put back.
> > + */
> > + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
> > + while (!list_empty(&mq->mqrq_cur->packed_list)) {
> > + prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
> > + if (prq->queuelist.prev !=&mq->mqrq_cur->packed_list) {
> > + list_del_init(&prq->queuelist);
> > + blk_requeue_request(mq->queue, prq);
> > + } else {
> > + list_del_init(&prq->queuelist);
> > + }
> > + }
> > + }
> > mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
>
> We must use disable_multi variable instead of directly calling this
> function with 0 value because there are some cases where disable_multi
> is set to 1.
This part is also origin code for non-packed case.
>
> > mmc_start_req(card->host,&mq->mqrq_cur->mmc_active, NULL);
>
> I think these two statements must come under else part of above if
> condition. Please check.
This two statements are applicable regardless of packed command.
Best regards,
Seungwon Jeon.
>
> Thanks,
> Sahitya.
> --
> Sent by a consultant of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum.
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: [PATCH] mmc: core: Add packed command for eMMC4.5 device
2011-11-17 2:23 ` Seungwon Jeon
@ 2011-11-20 19:41 ` merez
0 siblings, 0 replies; 8+ messages in thread
From: merez @ 2011-11-20 19:41 UTC (permalink / raw)
To: Seungwon Jeon
Cc: merez, svenkatr, linux-mmc, 'Chris Ball',
linux-kernel, linux-samsung-soc, kgene.kim, dh.han
> Maya Erez wrote:
>>
>> > + if (reqs >= 2) {
>> > + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
>> > + if (rq_data_dir(rqc) == READ) {
>> > + areq = &mq->mqrq_cur->mmc_active;
>> > + mmc_wait_for_req(card->host, areq->mrq);
>> Packing read requests requires preparation of two requests. After
>> sending
>> the header we wait for its completion before sending the next request
>> (mmc_wait_for_req is used). Therefore, if we try to pack 2 read requests
>> we might end up with worse performance in comparison to sending each
>> request by itself (which allows the preparation of one request while the
>> other is sent).
>> I suggest to check the size of the packed commands list and in case it
>> is
>> less than 3 send the requests one by one. If you move
>> mmc_blk_chk_packable
>> to queue.c after the first fetch this change should be very easy and can
>> be done by removing the requests from the packed_list and calling
>> issue_fn
>> for each one of them.
>
> Sending header for packed read which doesn't require nand program
> unlike normal data, so it may not spend long time.
> Which point you think is the overhead of packed two-requests
> in comparison to individual request?
When you send the packed commands you have to send an additional sector.
When you have only 2 or even 3 requests to send this might not be
negligible.
I think it's worth checking how often we send 2-3 requests in the packed
commands and if it's better to send it separately or packed. According to
the results you can decide if it's worth handling such cases.
Thanks,
Maya Erez
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
>>
>>
>>
>>
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: [PATCH] mmc: core: Add packed command for eMMC4.5 device
2011-11-16 11:51 merez
@ 2011-11-17 2:23 ` Seungwon Jeon
2011-11-20 19:41 ` merez
0 siblings, 1 reply; 8+ messages in thread
From: Seungwon Jeon @ 2011-11-17 2:23 UTC (permalink / raw)
To: merez
Cc: svenkatr, linux-mmc, 'Chris Ball',
linux-kernel, linux-samsung-soc, kgene.kim, dh.han
Maya Erez wrote:
>
> > + if (reqs >= 2) {
> > + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> > + if (rq_data_dir(rqc) == READ) {
> > + areq = &mq->mqrq_cur->mmc_active;
> > + mmc_wait_for_req(card->host, areq->mrq);
> Packing read requests requires preparation of two requests. After sending
> the header we wait for its completion before sending the next request
> (mmc_wait_for_req is used). Therefore, if we try to pack 2 read requests
> we might end up with worse performance in comparison to sending each
> request by itself (which allows the preparation of one request while the
> other is sent).
> I suggest to check the size of the packed commands list and in case it is
> less than 3 send the requests one by one. If you move mmc_blk_chk_packable
> to queue.c after the first fetch this change should be very easy and can
> be done by removing the requests from the packed_list and calling issue_fn
> for each one of them.
Sending header for packed read which doesn't require nand program
unlike normal data, so it may not spend long time.
Which point you think is the overhead of packed two-requests
in comparison to individual request?
>
> Thanks,
> Maya Erez
> Consultant for Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
>
>
>
>
>
>
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mmc: core: Add packed command for eMMC4.5 device
@ 2011-11-16 11:51 merez
2011-11-17 2:23 ` Seungwon Jeon
0 siblings, 1 reply; 8+ messages in thread
From: merez @ 2011-11-16 11:51 UTC (permalink / raw)
To: Seungwon Jeon
Cc: svenkatr, linux-mmc, 'Chris Ball',
linux-kernel, linux-samsung-soc, kgene.kim, dh.han
> + if (reqs >= 2) {
> + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> + if (rq_data_dir(rqc) == READ) {
> + areq = &mq->mqrq_cur->mmc_active;
> + mmc_wait_for_req(card->host, areq->mrq);
Packing read requests requires preparation of two requests. After sending
the header we wait for its completion before sending the next request
(mmc_wait_for_req is used). Therefore, if we try to pack 2 read requests
we might end up with worse performance in comparison to sending each
request by itself (which allows the preparation of one request while the
other is sent).
I suggest to check the size of the packed commands list and in case it is
less than 3 send the requests one by one. If you move mmc_blk_chk_packable
to queue.c after the first fetch this change should be very easy and can
be done by removing the requests from the packed_list and calling issue_fn
for each one of them.
Thanks,
Maya Erez
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2011-11-20 19:41 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-10-27 10:54 [PATCH] mmc: core: Add packed command for eMMC4.5 device Seungwon Jeon
2011-10-27 13:22 ` S, Venkatraman
2011-10-28 5:44 ` Seungwon Jeon
2011-11-16 11:15 ` Sahitya Tummala
2011-11-17 9:20 ` Seungwon Jeon
2011-11-16 11:51 merez
2011-11-17 2:23 ` Seungwon Jeon
2011-11-20 19:41 ` merez
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