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Commit 0912a5db authored by Jens Axboe's avatar Jens Axboe
Browse files

SPARC: sg chaining support 



This updates the sparc iommu/pci dma mappers to sg chaining.

Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 78bdc310

arch/sparc/kernel/ioport.c

+13 −12
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <linux/slab.h>

#include <linux/pci.h>		/* struct pci_dev */

#include <linux/proc_fs.h>

#include <linux/scatterlist.h>



#include <asm/io.h>

#include <asm/vaddrs.h>
@@ -717,19 +718,19 @@ void pci_unmap_page(struct pci_dev *hwdev, 
 * Device ownership issues as mentioned above for pci_map_single are

 * the same here.

 */

int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,

int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,

    int direction)

{

	struct scatterlist *sg;

	int n;



	BUG_ON(direction == PCI_DMA_NONE);

	/* IIep is write-through, not flushing. */

	for (n = 0; n < nents; n++) {

	for_each_sg(sgl, sg, nents, n) {

		BUG_ON(page_address(sg->page) == NULL);

		sg->dvma_address =

			virt_to_phys(page_address(sg->page)) + sg->offset;

		sg->dvma_length = sg->length;

		sg++;

	}

	return nents;

}
@@ -738,19 +739,19 @@ int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, 
 * Again, cpu read rules concerning calls here are the same as for

 * pci_unmap_single() above.

 */

void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,

void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,

    int direction)

{

	struct scatterlist *sg;

	int n;



	BUG_ON(direction == PCI_DMA_NONE);

	if (direction != PCI_DMA_TODEVICE) {

		for (n = 0; n < nents; n++) {

		for_each_sg(sgl, sg, nents, n) {

			BUG_ON(page_address(sg->page) == NULL);

			mmu_inval_dma_area(

			    (unsigned long) page_address(sg->page),

			    (sg->length + PAGE_SIZE-1) & PAGE_MASK);

			sg++;

		}

	}

}
@@ -789,34 +790,34 @@ void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t 
 * The same as pci_dma_sync_single_* but for a scatter-gather list,

 * same rules and usage.

 */

void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)

void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)

{

	struct scatterlist *sg;

	int n;



	BUG_ON(direction == PCI_DMA_NONE);

	if (direction != PCI_DMA_TODEVICE) {

		for (n = 0; n < nents; n++) {

		for_each_sg(sgl, sg, nents, n) {

			BUG_ON(page_address(sg->page) == NULL);

			mmu_inval_dma_area(

			    (unsigned long) page_address(sg->page),

			    (sg->length + PAGE_SIZE-1) & PAGE_MASK);

			sg++;

		}

	}

}



void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)

void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)

{

	struct scatterlist *sg;

	int n;



	BUG_ON(direction == PCI_DMA_NONE);

	if (direction != PCI_DMA_TODEVICE) {

		for (n = 0; n < nents; n++) {

		for_each_sg(sgl, sg, nents, n) {

			BUG_ON(page_address(sg->page) == NULL);

			mmu_inval_dma_area(

			    (unsigned long) page_address(sg->page),

			    (sg->length + PAGE_SIZE-1) & PAGE_MASK);

			sg++;

		}

	}

}

arch/sparc/mm/io-unit.c

+7 −5
Original line number Diff line number Diff line
@@ -11,8 +11,8 @@ 
#include <linux/mm.h>

#include <linux/highmem.h>	/* pte_offset_map => kmap_atomic */

#include <linux/bitops.h>

#include <linux/scatterlist.h>



#include <asm/scatterlist.h>

#include <asm/pgalloc.h>

#include <asm/pgtable.h>

#include <asm/sbus.h>
@@ -144,8 +144,9 @@ static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus 
	spin_lock_irqsave(&iounit->lock, flags);

	while (sz != 0) {

		--sz;

		sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);

		sg[sz].dvma_length = sg[sz].length;

		sg->dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg->page) + sg->offset, sg->length);

		sg->dvma_length = sg->length;

		sg = sg_next(sg);

	}

	spin_unlock_irqrestore(&iounit->lock, flags);

}
@@ -173,11 +174,12 @@ static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_ 
	spin_lock_irqsave(&iounit->lock, flags);

	while (sz != 0) {

		--sz;

		len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;

		vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;

		len = ((sg->dvma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;

		vaddr = (sg->dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;

		IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));

		for (len += vaddr; vaddr < len; vaddr++)

			clear_bit(vaddr, iounit->bmap);

		sg = sg_next(sg);

	}

	spin_unlock_irqrestore(&iounit->lock, flags);

}

arch/sparc/mm/iommu.c

+5 −5
Original line number Diff line number Diff line
@@ -12,8 +12,8 @@ 
#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/highmem.h>	/* pte_offset_map => kmap_atomic */

#include <linux/scatterlist.h>



#include <asm/scatterlist.h>

#include <asm/pgalloc.h>

#include <asm/pgtable.h>

#include <asm/sbus.h>
@@ -240,7 +240,7 @@ static void iommu_get_scsi_sgl_noflush(struct scatterlist *sg, int sz, struct sb 
		n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;

		sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;

		sg->dvma_length = (__u32) sg->length;

		sg++;

		sg = sg_next(sg);

	}

}
@@ -254,7 +254,7 @@ static void iommu_get_scsi_sgl_gflush(struct scatterlist *sg, int sz, struct sbu 
		n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;

		sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;

		sg->dvma_length = (__u32) sg->length;

		sg++;

		sg = sg_next(sg);

	}

}
@@ -285,7 +285,7 @@ static void iommu_get_scsi_sgl_pflush(struct scatterlist *sg, int sz, struct sbu 


		sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;

		sg->dvma_length = (__u32) sg->length;

		sg++;

		sg = sg_next(sg);

	}

}
@@ -325,7 +325,7 @@ static void iommu_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_b 
		n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;

		iommu_release_one(sg->dvma_address & PAGE_MASK, n, sbus);

		sg->dvma_address = 0x21212121;

		sg++;

		sg = sg_next(sg);

	}

}

arch/sparc/mm/sun4c.c

+6 −4
Original line number Diff line number Diff line
@@ -17,8 +17,8 @@ 
#include <linux/highmem.h>

#include <linux/fs.h>

#include <linux/seq_file.h>

#include <linux/scatterlist.h>



#include <asm/scatterlist.h>

#include <asm/page.h>

#include <asm/pgalloc.h>

#include <asm/pgtable.h>
@@ -1228,8 +1228,9 @@ static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus * 
{

	while (sz != 0) {

		--sz;

		sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);

		sg[sz].dvma_length = sg[sz].length;

		sg->dvma_address = (__u32)sun4c_lockarea(page_address(sg->page) + sg->offset, sg->length);

		sg->dvma_length = sg->length;

		sg = sg_next(sg);

	}

}
@@ -1244,7 +1245,8 @@ static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_b 
{

	while (sz != 0) {

		--sz;

		sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);

		sun4c_unlockarea((char *)sg->dvma_address, sg->length);

		sg = sg_next(sg);

	}

}

include/asm-sparc/scatterlist.h

+2 −0
Original line number Diff line number Diff line
@@ -19,4 +19,6 @@ struct scatterlist { 


#define ISA_DMA_THRESHOLD (~0UL)



#define ARCH_HAS_SG_CHAIN



#endif /* !(_SPARC_SCATTERLIST_H) */