From cc6be13159316e8bdcd8bbb5209315256e151337 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 25 Apr 2019 08:12:11 +0200
Subject: [PATCH] mtip32xx: remove trim support
The trim support in mtip32xx has been "temporarily" disabled for 6
years, which is 3/4 of the time the driver even exists in the tree.
Remove it as it obviously is dead code now.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
drivers/block/mtip32xx/mtip32xx.c | 89 -------------------------------
drivers/block/mtip32xx/mtip32xx.h | 17 ------
2 files changed, 106 deletions(-)
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 83302ecdc8db..f0105d118056 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -1192,14 +1192,6 @@ static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
else
clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
-#ifdef MTIP_TRIM /* Disabling TRIM support temporarily */
- /* 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
-#endif
- port->dd->trim_supp = false;
-
/* Set the identify buffer as valid. */
port->identify_valid = 1;
@@ -1386,77 +1378,6 @@ static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
return rv;
}
-/*
- * Trim unused sectors
- *
- * @dd pointer to driver_data structure
- * @lba starting lba
- * @len # of 512b sectors to trim
- */
-static blk_status_t mtip_send_trim(struct driver_data *dd, unsigned int lba,
- unsigned int len)
-{
- u64 tlba, tlen, sect_left;
- struct mtip_trim_entry *buf;
- dma_addr_t dma_addr;
- struct host_to_dev_fis fis;
- blk_status_t ret = BLK_STS_OK;
- int i;
-
- if (!len || dd->trim_supp == false)
- return BLK_STS_IOERR;
-
- /* 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 = dma_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
- GFP_KERNEL);
- if (!buf)
- return BLK_STS_RESOURCE;
- 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 = cpu_to_le32(tlba);
- buf[i].range = 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,
- MTIP_TRIM_TIMEOUT_MS) < 0)
- ret = BLK_STS_IOERR;
-
- dma_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
- return ret;
-}
-
/*
* Get the drive capacity.
*
@@ -3590,8 +3511,6 @@ static blk_status_t mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
blk_mq_start_request(rq);
- if (req_op(rq) == REQ_OP_DISCARD)
- return mtip_send_trim(dd, blk_rq_pos(rq), blk_rq_sectors(rq));
mtip_hw_submit_io(dd, rq, cmd, hctx);
return BLK_STS_OK;
}
@@ -3769,14 +3688,6 @@ skip_create_disk:
blk_queue_max_segment_size(dd->queue, 0x400000);
blk_queue_io_min(dd->queue, 4096);
- /* Signal trim support */
- if (dd->trim_supp == true) {
- blk_queue_flag_set(QUEUE_FLAG_DISCARD, dd->queue);
- dd->queue->limits.discard_granularity = 4096;
- blk_queue_max_discard_sectors(dd->queue,
- MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
- }
-
/* 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 abce25f27f57..91c1cb5b1532 100644
--- a/drivers/block/mtip32xx/mtip32xx.h
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -193,21 +193,6 @@ struct mtip_work {
mtip_workq_sdbfx(w->port, group, w->completed); \
}
-#define MTIP_TRIM_TIMEOUT_MS 240000
-#define MTIP_MAX_TRIM_ENTRIES 8
-#define MTIP_MAX_TRIM_ENTRY_LEN 0xfff8
-
-struct mtip_trim_entry {
- __le32 lba; /* starting lba of region */
- __le16 rsvd; /* unused */
- __le16 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 {
/*
@@ -474,8 +459,6 @@ struct driver_data {
struct dentry *dfs_node;
- bool trim_supp; /* flag indicating trim support */
-
bool sr;
int numa_node; /* NUMA support */