linux-kernel - Re: [PATCH] SCSI driver for VMware's virtual HBA

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Message-ID: <4AA03A9F.2040500@linux.vnet.ibm.com>
Date:	Thu, 03 Sep 2009 16:52:31 -0500
From:	Brian King <brking@...ux.vnet.ibm.com>
To:	akataria@...are.com
CC:	James Bottomley <James.Bottomley@...e.de>,
	Rolf Eike Beer <eike-kernel@...tec.de>,
	Matthew Wilcox <matthew@....cx>,
	Roland Dreier <rdreier@...co.com>,
	Bart Van Assche <bvanassche@....org>,
	Robert Love <robert.w.love@...el.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Mike Christie <michaelc@...wisc.edu>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	pv-drivers@...are.com
Subject: Re: [PATCH] SCSI driver for VMware's virtual HBA - V3.

Alok Kataria wrote:
> +
> +struct pvscsi_adapter {
> +	char			*mmioBase;
> +	unsigned int		irq;
> +	u8			rev;
> +	bool			use_msi;
> +	bool			use_msix;
> +	bool			use_msg;
> +
> +	spinlock_t		hw_lock;

Why not just use host_lock in the scsi_host structure?


> +
> +/*
> + * Map all data buffers for a command into PCI space and
> + * setup the scatter/gather list if needed.
> + */
> +static void pvscsi_map_buffers(struct pvscsi_adapter *adapter,
> +			       struct pvscsi_ctx *ctx,
> +			       struct scsi_cmnd *cmd, PVSCSIRingReqDesc *e)
> +{
> +	unsigned count;
> +	unsigned bufflen = scsi_bufflen(cmd);
> +	struct scatterlist *sg;
> +
> +	e->dataLen = bufflen;
> +	e->dataAddr = 0;
> +	if (bufflen == 0)
> +		return;
> +
> +	sg = scsi_sglist(cmd);
> +	count = scsi_sg_count(cmd);
> +	if (count != 0) {
> +		int segs = pci_map_sg(adapter->dev, sg, count,
> +				      cmd->sc_data_direction);

Should use scsi_dma_map here instead.

> +		if (segs > 1) {
> +			pvscsi_create_sg(ctx, sg, segs);
> +
> +			e->flags |= PVSCSI_FLAG_CMD_WITH_SG_LIST;
> +			ctx->sglPA = pci_map_single(adapter->dev, ctx->sgl,
> +						    SGL_SIZE, PCI_DMA_TODEVICE);
> +			e->dataAddr = ctx->sglPA;
> +		} else
> +			e->dataAddr = sg_dma_address(sg);
> +	} else {
> +		/*
> +		 * In case there is no S/G list, scsi_sglist points
> +		 * directly to the buffer.
> +		 */
> +		ctx->dataPA = pci_map_single(adapter->dev, sg, bufflen,
> +					     cmd->sc_data_direction);
> +		e->dataAddr = ctx->dataPA;
> +	}
> +}
> +
> +static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter,
> +				 struct pvscsi_ctx *ctx)
> +{
> +	struct scsi_cmnd *cmd;
> +	unsigned bufflen;
> +
> +	cmd = ctx->cmd;
> +	bufflen = scsi_bufflen(cmd);
> +
> +	if (bufflen != 0) {
> +		unsigned count = scsi_sg_count(cmd);
> +
> +		if (count != 0) {
> +			pci_unmap_sg(adapter->dev, scsi_sglist(cmd), count,
> +				     cmd->sc_data_direction);

Use scsi_dma_unmap here instead.

> +			if (ctx->sglPA) {
> +				pci_unmap_single(adapter->dev, ctx->sglPA,
> +						 SGL_SIZE, PCI_DMA_TODEVICE);
> +				ctx->sglPA = 0;
> +			}
> +		} else
> +			pci_unmap_single(adapter->dev, ctx->dataPA, bufflen,
> +					 cmd->sc_data_direction);
> +	}
> +	if (cmd->sense_buffer)
> +		pci_unmap_single(adapter->dev, ctx->sensePA,
> +				 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
> +}
> +


-- 
Brian King
Linux on Power Virtualization
IBM Linux Technology Center


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