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From: Christoph Hellwig <hch@lst.de>
To: axboe@kernel.dk
Cc: linux-block@vger.kernel.org
Subject: [PATCH] mtip32xx: ѕtop abusing the managed resource APIs
Date: Mon, 14 Jan 2019 21:23:30 +0100	[thread overview]
Message-ID: <20190114202330.12597-1-hch@lst.de> (raw)

The mtip32xx driver uses managed resources for DMA coherent memory
and irqs, but then always pairs them with free calls anyway, making
the resource tracking rather pointless.  Given some DMA allocations
are transient anyway, the irq freeing seems to require ordering vs
other hardware access the best solution seems to be to stop using
the managed resurce API entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/mtip32xx/mtip32xx.c | 37 +++++++++++++------------------
 1 file changed, 16 insertions(+), 21 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 88e8440e75c3..9a6f40cd8df6 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -1415,7 +1415,7 @@ static blk_status_t mtip_send_trim(struct driver_data *dd, unsigned int lba,
 	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,
+	buf = dma_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
 								GFP_KERNEL);
 	if (!buf)
 		return BLK_STS_RESOURCE;
@@ -1452,7 +1452,7 @@ static blk_status_t mtip_send_trim(struct driver_data *dd, unsigned int lba,
 					MTIP_TRIM_TIMEOUT_MS) < 0)
 		ret = BLK_STS_IOERR;
 
-	dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
+	dma_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
 	return ret;
 }
 
@@ -1655,7 +1655,7 @@ static int exec_drive_command(struct mtip_port *port, u8 *command,
 		if (!user_buffer)
 			return -EFAULT;
 
-		buf = dmam_alloc_coherent(&port->dd->pdev->dev,
+		buf = dma_alloc_coherent(&port->dd->pdev->dev,
 				ATA_SECT_SIZE * xfer_sz,
 				&dma_addr,
 				GFP_KERNEL);
@@ -1733,7 +1733,7 @@ static int exec_drive_command(struct mtip_port *port, u8 *command,
 	}
 exit_drive_command:
 	if (buf)
-		dmam_free_coherent(&port->dd->pdev->dev,
+		dma_free_coherent(&port->dd->pdev->dev,
 				ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
 	return rv;
 }
@@ -2837,11 +2837,11 @@ static void mtip_dma_free(struct driver_data *dd)
 	struct mtip_port *port = dd->port;
 
 	if (port->block1)
-		dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
+		dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
 					port->block1, port->block1_dma);
 
 	if (port->command_list) {
-		dmam_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
+		dma_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
 				port->command_list, port->command_list_dma);
 	}
 }
@@ -2860,7 +2860,7 @@ static int mtip_dma_alloc(struct driver_data *dd)
 
 	/* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
 	port->block1 =
-		dmam_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
+		dma_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
 					&port->block1_dma, GFP_KERNEL);
 	if (!port->block1)
 		return -ENOMEM;
@@ -2868,10 +2868,10 @@ static int mtip_dma_alloc(struct driver_data *dd)
 
 	/* Allocate dma memory for command list */
 	port->command_list =
-		dmam_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
+		dma_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
 					&port->command_list_dma, GFP_KERNEL);
 	if (!port->command_list) {
-		dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
+		dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
 					port->block1, port->block1_dma);
 		port->block1 = NULL;
 		port->block1_dma = 0;
@@ -3056,13 +3056,8 @@ static int mtip_hw_init(struct driver_data *dd)
 	mtip_start_port(dd->port);
 
 	/* Setup the ISR and enable interrupts. */
-	rv = devm_request_irq(&dd->pdev->dev,
-				dd->pdev->irq,
-				mtip_irq_handler,
-				IRQF_SHARED,
-				dev_driver_string(&dd->pdev->dev),
-				dd);
-
+	rv = request_irq(dd->pdev->irq, mtip_irq_handler, IRQF_SHARED,
+			 dev_driver_string(&dd->pdev->dev), dd);
 	if (rv) {
 		dev_err(&dd->pdev->dev,
 			"Unable to allocate IRQ %d\n", dd->pdev->irq);
@@ -3090,7 +3085,7 @@ static int mtip_hw_init(struct driver_data *dd)
 
 	/* Release the IRQ. */
 	irq_set_affinity_hint(dd->pdev->irq, NULL);
-	devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
+	free_irq(dd->pdev->irq, dd);
 
 out2:
 	mtip_deinit_port(dd->port);
@@ -3145,7 +3140,7 @@ static int mtip_hw_exit(struct driver_data *dd)
 
 	/* Release the IRQ. */
 	irq_set_affinity_hint(dd->pdev->irq, NULL);
-	devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
+	free_irq(dd->pdev->irq, dd);
 	msleep(1000);
 
 	/* Free dma regions */
@@ -3609,8 +3604,8 @@ static void mtip_free_cmd(struct blk_mq_tag_set *set, struct request *rq,
 	if (!cmd->command)
 		return;
 
-	dmam_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
-				cmd->command, cmd->command_dma);
+	dma_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ, cmd->command,
+			  cmd->command_dma);
 }
 
 static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
@@ -3619,7 +3614,7 @@ static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
 	struct driver_data *dd = set->driver_data;
 	struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
 
-	cmd->command = dmam_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
+	cmd->command = dma_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
 			&cmd->command_dma, GFP_KERNEL);
 	if (!cmd->command)
 		return -ENOMEM;
-- 
2.20.1


             reply	other threads:[~2019-01-14 20:23 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-14 20:23 Christoph Hellwig [this message]
2019-01-15 14:32 ` [PATCH] mtip32xx: ѕtop abusing the managed resource APIs Jens Axboe

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