Patchwork [3/3] libata: Make sil680 do its own exec_command posting

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Submitter Alan Cox
Date May 5, 2010, 9:25 a.m.
Message ID <20100505092542.586.16410.stgit@localhost.localdomain>
Download mbox | patch
Permalink /patch/51681/
State Not Applicable
Delegated to: David Miller
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Comments

Alan Cox - May 5, 2010, 9:25 a.m.
Use our own mmio area to avoid PCI posting. This avoids the rather slow
paranoid implementation in the default handler.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---

 drivers/ata/pata_sil680.c |   30 ++++++++++++++++++++++++++----
 1 files changed, 26 insertions(+), 4 deletions(-)



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Jeff Garzik - May 15, 2010, 2:34 a.m.
On 05/05/2010 05:25 AM, Alan Cox wrote:
> Use our own mmio area to avoid PCI posting. This avoids the rather slow
> paranoid implementation in the default handler.
>
> Signed-off-by: Alan Cox<alan@linux.intel.com>
> ---
>
>   drivers/ata/pata_sil680.c |   30 ++++++++++++++++++++++++++----
>   1 files changed, 26 insertions(+), 4 deletions(-)

applied


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Patch

diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index c6c589c..43faf10 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -190,15 +190,37 @@  static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 	pci_write_config_word(pdev, ua, ultra);
 }
 
+/**
+ *	sil680_sff_exec_command - issue ATA command to host controller
+ *	@ap: port to which command is being issued
+ *	@tf: ATA taskfile register set
+ *
+ *	Issues ATA command, with proper synchronization with interrupt
+ *	handler / other threads. Use our MMIO space for PCI posting to avoid
+ *	a hideously slow cycle all the way to the device.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+void sil680_sff_exec_command(struct ata_port *ap,
+					const struct ata_taskfile *tf)
+{
+	DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
+	iowrite8(tf->command, ap->ioaddr.command_addr);
+	ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+}
+
 static struct scsi_host_template sil680_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };
 
+
 static struct ata_port_operations sil680_port_ops = {
-	.inherits	= &ata_bmdma32_port_ops,
-	.cable_detect	= sil680_cable_detect,
-	.set_piomode	= sil680_set_piomode,
-	.set_dmamode	= sil680_set_dmamode,
+	.inherits		= &ata_bmdma32_port_ops,
+	.sff_exec_command	= sil680_sff_exec_command,
+	.cable_detect		= sil680_cable_detect,
+	.set_piomode		= sil680_set_piomode,
+	.set_dmamode		= sil680_set_dmamode,
 };
 
 /**