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Message-ID: <50F01010.4090306@micron.com>
Date: Fri, 11 Jan 2013 18:43:52 +0530
From: Asai Thambi S P <asamymuthupa@...ron.com>
To: Jens Axboe <axboe@...nel.dk>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Sam Bradshaw" <sbradshaw@...ron.com>,
"Selvan Mani (smani) [CONT - Type 2]" <smani@...ron.com>
Subject: [PATCH 1/3] mtip32xx: add trim support
TRIM support added through vendor unique command.
Signed-off-by: Sam Bradshaw < sbradshaw@...ron.com>
Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
---
drivers/block/mtip32xx/mtip32xx.c | 96 +++++++++++++++++++++++++++++++++++++
drivers/block/mtip32xx/mtip32xx.h | 18 +++++++
2 files changed, 114 insertions(+), 0 deletions(-)
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index f946d31..b7e6631 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -1487,6 +1487,12 @@ static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
}
#endif
+ /* Demux ID.DRAT & ID.RZAT to determine trim support */
+ if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
+ port->dd->trim_supp = true;
+ else
+ port->dd->trim_supp = false;
+
/* Set the identify buffer as valid. */
port->identify_valid = 1;
@@ -1674,6 +1680,81 @@ static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
}
/*
+ * Trim unused sectors
+ *
+ * @dd pointer to driver_data structure
+ * @lba starting lba
+ * @len # of 512b sectors to trim
+ *
+ * return value
+ * -ENOMEM Out of dma memory
+ * -EINVAL Invalid parameters passed in, trim not supported
+ * -EIO Error submitting trim request to hw
+ */
+int mtip_send_trim(struct driver_data *dd, unsigned int lba, unsigned int len)
+{
+ int i, rv = 0;
+ u64 tlba, tlen, sect_left;
+ struct mtip_trim_entry *buf;
+ dma_addr_t dma_addr;
+ struct host_to_dev_fis fis;
+
+ if (!len || dd->trim_supp == false)
+ return -EINVAL;
+
+ /* Trim request too big */
+ WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
+
+ /* Trim request not aligned on 4k boundary */
+ WARN_ON(len % 8 != 0);
+
+ /* Warn if vu_trim structure is too big */
+ WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
+
+ /* Allocate a DMA buffer for the trim structure */
+ buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
+ GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ memset(buf, 0, ATA_SECT_SIZE);
+
+ for (i = 0, sect_left = len, tlba = lba;
+ i < MTIP_MAX_TRIM_ENTRIES && sect_left;
+ i++) {
+ tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
+ MTIP_MAX_TRIM_ENTRY_LEN :
+ sect_left);
+ buf[i].lba = __force_bit2int cpu_to_le32(tlba);
+ buf[i].range = __force_bit2int cpu_to_le16(tlen);
+ tlba += tlen;
+ sect_left -= tlen;
+ }
+ WARN_ON(sect_left != 0);
+
+ /* Build the fis */
+ memset(&fis, 0, sizeof(struct host_to_dev_fis));
+ fis.type = 0x27;
+ fis.opts = 1 << 7;
+ fis.command = 0xfb;
+ fis.features = 0x60;
+ fis.sect_count = 1;
+ fis.device = ATA_DEVICE_OBS;
+
+ if (mtip_exec_internal_command(dd->port,
+ &fis,
+ 5,
+ dma_addr,
+ ATA_SECT_SIZE,
+ 0,
+ GFP_KERNEL,
+ MTIP_TRIM_TIMEOUT_MS) < 0)
+ rv = -EIO;
+
+ dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
+ return rv;
+}
+
+/*
* Get the drive capacity.
*
* @dd Pointer to the device data structure.
@@ -3623,6 +3704,12 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
}
}
+ if (unlikely(bio->bi_rw & REQ_DISCARD)) {
+ bio_endio(bio, mtip_send_trim(dd, bio->bi_sector,
+ bio_sectors(bio)));
+ return;
+ }
+
if (unlikely(!bio_has_data(bio))) {
blk_queue_flush(queue, 0);
bio_endio(bio, 0);
@@ -3765,6 +3852,15 @@ skip_create_disk:
*/
blk_queue_flush(dd->queue, 0);
+ /* Signal trim support */
+ if (dd->trim_supp == true) {
+ set_bit(QUEUE_FLAG_DISCARD, &dd->queue->queue_flags);
+ dd->queue->limits.discard_granularity = 4096;
+ blk_queue_max_discard_sectors(dd->queue,
+ MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
+ dd->queue->limits.discard_zeroes_data = 0;
+ }
+
/* Set the capacity of the device in 512 byte sectors. */
if (!(mtip_hw_get_capacity(dd, &capacity))) {
dev_warn(&dd->pdev->dev,
diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h
index 18627a1..6761202 100644
--- a/drivers/block/mtip32xx/mtip32xx.h
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -161,6 +161,22 @@ __packed struct smart_attr{
u8 res[3];
};
+
+#define MTIP_TRIM_TIMEOUT_MS 240000
+#define MTIP_MAX_TRIM_ENTRIES 8
+#define MTIP_MAX_TRIM_ENTRY_LEN 0xfff8
+
+struct mtip_trim_entry {
+ u32 lba; /* starting lba of region */
+ u16 rsvd; /* unused */
+ u16 range; /* # of 512b blocks to trim */
+} __packed;
+
+struct mtip_trim {
+ /* Array of regions to trim */
+ struct mtip_trim_entry entry[MTIP_MAX_TRIM_ENTRIES];
+} __packed;
+
/* Register Frame Information Structure (FIS), host to device. */
struct host_to_dev_fis {
/*
@@ -458,6 +474,8 @@ struct driver_data {
struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
struct dentry *dfs_node;
+
+ bool trim_supp; /* flag indicating trim support */
};
#endif
--
1.7.1
--
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