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

@@ -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 @@ static int mtip_block_initialize(struct driver_data *dd)
 	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,

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 */