libata: fix ATAPI DMA alignment issues (cedc9a47) · Commits · EulixOS / Software / Kernel

drivers/scsi/ahci.c

+19 −11

Original line number	Diff line number	Diff line
		@@ -314,8 +314,15 @@ static int ahci_port_start(struct ata_port *ap)
		return -ENOMEM;
		memset(pp, 0, sizeof(*pp));

		ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, &ap->pad_dma, GFP_KERNEL);
		if (!ap->pad) {
		kfree(pp);
		return -ENOMEM;
		}

		mem = dma_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL);
		if (!mem) {
		dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
		kfree(pp);
		return -ENOMEM;
		}
		@@ -391,6 +398,7 @@ static void ahci_port_stop(struct ata_port *ap)
		ap->private_data = NULL;
		dma_free_coherent(dev, AHCI_PORT_PRIV_DMA_SZ,
		pp->cmd_slot, pp->cmd_slot_dma);
		dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
		kfree(pp);
		}

		@@ -476,23 +484,23 @@ static void ahci_tf_read(struct ata_port ap, struct ata_taskfile tf)
		static void ahci_fill_sg(struct ata_queued_cmd *qc)
		{
		struct ahci_port_priv *pp = qc->ap->private_data;
		unsigned int i;
		struct scatterlist *sg;
		struct ahci_sg *ahci_sg;

		VPRINTK("ENTER\n");

		/*
		* Next, the S/G list.
		*/
		for (i = 0; i < qc->n_elem; i++) {
		u32 sg_len;
		dma_addr_t addr;

		addr = sg_dma_address(&qc->sg[i]);
		sg_len = sg_dma_len(&qc->sg[i]);

		pp->cmd_tbl_sg[i].addr = cpu_to_le32(addr & 0xffffffff);
		pp->cmd_tbl_sg[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
		pp->cmd_tbl_sg[i].flags_size = cpu_to_le32(sg_len - 1);
		ahci_sg = pp->cmd_tbl_sg;
		ata_for_each_sg(sg, qc) {
		dma_addr_t addr = sg_dma_address(sg);
		u32 sg_len = sg_dma_len(sg);

		ahci_sg->addr = cpu_to_le32(addr & 0xffffffff);
		ahci_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
		ahci_sg->flags_size = cpu_to_le32(sg_len - 1);
		ahci_sg++;
		}
		}

drivers/scsi/libata-core.c

+106 −17

Original line number	Diff line number	Diff line
		@@ -2156,8 +2156,9 @@ static void ata_dev_set_xfermode(struct ata_port ap, struct ata_device dev)
		static void ata_sg_clean(struct ata_queued_cmd *qc)
		{
		struct ata_port *ap = qc->ap;
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg = qc->__sg;
		int dir = qc->dma_dir;
		void *pad_buf = NULL;

		assert(qc->flags & ATA_QCFLAG_DMAMAP);
		assert(sg != NULL);
		@@ -2167,14 +2168,35 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)

		DPRINTK("unmapping %u sg elements\n", qc->n_elem);

		if (qc->flags & ATA_QCFLAG_SG)
		/* if we padded the buffer out to 32-bit bound, and data
		* xfer direction is from-device, we must copy from the
		* pad buffer back into the supplied buffer
		*/
		if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
		pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);

		if (qc->flags & ATA_QCFLAG_SG) {
		dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
		else
		/* restore last sg */
		sg[qc->orig_n_elem - 1].length += qc->pad_len;
		if (pad_buf) {
		struct scatterlist *psg = &qc->pad_sgent;
		void *addr = kmap_atomic(psg->page, KM_IRQ0);
		memcpy(addr + psg->offset, pad_buf, qc->pad_len);
		kunmap_atomic(psg->page, KM_IRQ0);
		}
		} else {
		dma_unmap_single(ap->host_set->dev, sg_dma_address(&sg[0]),
		sg_dma_len(&sg[0]), dir);
		/* restore sg */
		sg->length += qc->pad_len;
		if (pad_buf)
		memcpy(qc->buf_virt + sg->length - qc->pad_len,
		pad_buf, qc->pad_len);
		}

		qc->flags &= ~ATA_QCFLAG_DMAMAP;
		qc->sg = NULL;
		qc->__sg = NULL;
		}

		/**
		@@ -2190,15 +2212,15 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
		*/
		static void ata_fill_sg(struct ata_queued_cmd *qc)
		{
		struct scatterlist *sg = qc->sg;
		struct ata_port *ap = qc->ap;
		unsigned int idx, nelem;
		struct scatterlist *sg;
		unsigned int idx;

		assert(sg != NULL);
		assert(qc->__sg != NULL);
		assert(qc->n_elem > 0);

		idx = 0;
		for (nelem = qc->n_elem; nelem; nelem--,sg++) {
		ata_for_each_sg(sg, qc) {
		u32 addr, offset;
		u32 sg_len, len;

		@@ -2289,11 +2311,12 @@ void ata_sg_init_one(struct ata_queued_cmd qc, void buf, unsigned int buflen)
		qc->flags \|= ATA_QCFLAG_SINGLE;

		memset(&qc->sgent, 0, sizeof(qc->sgent));
		qc->sg = &qc->sgent;
		qc->__sg = &qc->sgent;
		qc->n_elem = 1;
		qc->orig_n_elem = 1;
		qc->buf_virt = buf;

		sg = qc->sg;
		sg = qc->__sg;
		sg->page = virt_to_page(buf);
		sg->offset = (unsigned long) buf & ~PAGE_MASK;
		sg->length = buflen;
		@@ -2317,8 +2340,9 @@ void ata_sg_init(struct ata_queued_cmd qc, struct scatterlist sg,
		unsigned int n_elem)
		{
		qc->flags \|= ATA_QCFLAG_SG;
		qc->sg = sg;
		qc->__sg = sg;
		qc->n_elem = n_elem;
		qc->orig_n_elem = n_elem;
		}

		/**
		@@ -2338,9 +2362,32 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
		{
		struct ata_port *ap = qc->ap;
		int dir = qc->dma_dir;
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg = qc->__sg;
		dma_addr_t dma_address;

		/* we must lengthen transfers to end on a 32-bit boundary */
		qc->pad_len = sg->length & 3;
		if (qc->pad_len) {
		void pad_buf = ap->pad + (qc->tag ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;

		assert(qc->dev->class == ATA_DEV_ATAPI);

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		if (qc->tf.flags & ATA_TFLAG_WRITE)
		memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
		qc->pad_len);

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim sg */
		sg->length -= qc->pad_len;

		DPRINTK("padding done, sg->length=%u pad_len=%u\n",
		sg->length, qc->pad_len);
		}

		dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
		sg->length, dir);
		if (dma_mapping_error(dma_address))
		@@ -2372,12 +2419,47 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
		static int ata_sg_setup(struct ata_queued_cmd *qc)
		{
		struct ata_port *ap = qc->ap;
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg = qc->__sg;
		struct scatterlist *lsg = &sg[qc->n_elem - 1];
		int n_elem, dir;

		VPRINTK("ENTER, ata%u\n", ap->id);
		assert(qc->flags & ATA_QCFLAG_SG);

		/* we must lengthen transfers to end on a 32-bit boundary */
		qc->pad_len = lsg->length & 3;
		if (qc->pad_len) {
		void pad_buf = ap->pad + (qc->tag ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;
		unsigned int offset;

		assert(qc->dev->class == ATA_DEV_ATAPI);

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		/*
		* psg->page/offset are used to copy to-be-written
		* data in this function or read data in ata_sg_clean.
		*/
		offset = lsg->offset + lsg->length - qc->pad_len;
		psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
		psg->offset = offset_in_page(offset);

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
		void *addr = kmap_atomic(psg->page, KM_IRQ0);
		memcpy(pad_buf, addr + psg->offset, qc->pad_len);
		kunmap_atomic(psg->page, KM_IRQ0);
		}

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim last sg */
		lsg->length -= qc->pad_len;

		DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
		qc->n_elem - 1, lsg->length, qc->pad_len);
		}

		dir = qc->dma_dir;
		n_elem = dma_map_sg(ap->host_set->dev, sg, qc->n_elem, dir);
		if (n_elem < 1)
		@@ -2655,7 +2737,7 @@ static void ata_data_xfer(struct ata_port ap, unsigned char buf,
		static void ata_pio_sector(struct ata_queued_cmd *qc)
		{
		int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg = qc->__sg;
		struct ata_port *ap = qc->ap;
		struct page *page;
		unsigned int offset;
		@@ -2705,7 +2787,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
		static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
		{
		int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg = qc->__sg;
		struct ata_port *ap = qc->ap;
		struct page *page;
		unsigned char *buf;
		@@ -2738,7 +2820,7 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
		return;
		}

		sg = &qc->sg[qc->cursg];
		sg = &qc->__sg[qc->cursg];

		page = sg->page;
		offset = sg->offset + qc->cursg_ofs;
		@@ -3145,7 +3227,7 @@ struct ata_queued_cmd ata_qc_new_init(struct ata_port ap,

		qc = ata_qc_new(ap);
		if (qc) {
		qc->sg = NULL;
		qc->__sg = NULL;
		qc->flags = 0;
		qc->scsicmd = NULL;
		qc->ap = ap;
		@@ -3837,6 +3919,12 @@ int ata_port_start (struct ata_port *ap)
		if (!ap->prd)
		return -ENOMEM;

		ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, &ap->pad_dma, GFP_KERNEL);
		if (!ap->pad) {
		dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
		return -ENOMEM;
		}

		DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);

		return 0;
		@@ -3859,6 +3947,7 @@ void ata_port_stop (struct ata_port *ap)
		struct device *dev = ap->host_set->dev;

		dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
		dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
		}

		void ata_host_stop (struct ata_host_set *host_set)

drivers/scsi/libata-scsi.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -150,10 +150,10 @@ struct ata_queued_cmd ata_scsi_qc_new(struct ata_port ap,
		qc->scsidone = done;

		if (cmd->use_sg) {
		qc->sg = (struct scatterlist *) cmd->request_buffer;
		qc->__sg = (struct scatterlist *) cmd->request_buffer;
		qc->n_elem = cmd->use_sg;
		} else {
		qc->sg = &qc->sgent;
		qc->__sg = &qc->sgent;
		qc->n_elem = 1;
		}
		} else {
		@@ -364,6 +364,16 @@ int ata_scsi_slave_config(struct scsi_device *sdev)
		*/
		blk_queue_max_sectors(sdev->request_queue, 2048);
		}

		/*
		* SATA DMA transfers must be multiples of 4 byte, so
		* we need to pad ATAPI transfers using an extra sg.
		* Decrement max hw segments accordingly.
		*/
		if (dev->class == ATA_DEV_ATAPI) {
		request_queue_t *q = sdev->request_queue;
		blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
		}
		}

		return 0; /* scsi layer doesn't check return value, sigh */

drivers/scsi/sata_qstor.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -268,16 +268,17 @@ static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)

		static void qs_fill_sg(struct ata_queued_cmd *qc)
		{
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg;
		struct ata_port *ap = qc->ap;
		struct qs_port_priv *pp = ap->private_data;
		unsigned int nelem;
		u8 *prd = pp->pkt + QS_CPB_BYTES;

		assert(sg != NULL);
		assert(qc->__sg != NULL);
		assert(qc->n_elem > 0);

		for (nelem = 0; nelem < qc->n_elem; nelem++,sg++) {
		nelem = 0;
		ata_for_each_sg(sg, qc) {
		u64 addr;
		u32 len;

		@@ -291,6 +292,7 @@ static void qs_fill_sg(struct ata_queued_cmd *qc)

		VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", nelem,
		(unsigned long long)addr, len);
		nelem++;
		}
		}

drivers/scsi/sata_sx4.c

+6 −7

Original line number	Diff line number	Diff line
		@@ -449,14 +449,14 @@ static inline void pdc20621_host_pkt(struct ata_taskfile tf, u8 buf,

		static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
		{
		struct scatterlist *sg = qc->sg;
		struct scatterlist *sg;
		struct ata_port *ap = qc->ap;
		struct pdc_port_priv *pp = ap->private_data;
		void __iomem *mmio = ap->host_set->mmio_base;
		struct pdc_host_priv *hpriv = ap->host_set->private_data;
		void __iomem *dimm_mmio = hpriv->dimm_mmio;
		unsigned int portno = ap->port_no;
		unsigned int i, last, idx, total_len = 0, sgt_len;
		unsigned int i, idx, total_len = 0, sgt_len;
		u32 buf = (u32 ) &pp->dimm_buf[PDC_DIMM_HEADER_SZ];

		assert(qc->flags & ATA_QCFLAG_DMAMAP);
		@@ -469,12 +469,11 @@ static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
		/*
		* Build S/G table
		*/
		last = qc->n_elem;
		idx = 0;
		for (i = 0; i < last; i++) {
		buf[idx++] = cpu_to_le32(sg_dma_address(&sg[i]));
		buf[idx++] = cpu_to_le32(sg_dma_len(&sg[i]));
		total_len += sg_dma_len(&sg[i]);
		ata_for_each_sg(sg, qc) {
		buf[idx++] = cpu_to_le32(sg_dma_address(sg));
		buf[idx++] = cpu_to_le32(sg_dma_len(sg));
		total_len += sg_dma_len(sg);
		}
		buf[idx - 1] \|= cpu_to_le32(ATA_PRD_EOT);
		sgt_len = idx * 4;