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-rw-r--r--arch/ia64/hp/common/sba_iommu.c4
-rw-r--r--arch/sparc64/kernel/iommu.c13
-rw-r--r--arch/sparc64/kernel/iommu_common.c51
-rw-r--r--arch/sparc64/kernel/iommu_common.h1
-rw-r--r--arch/sparc64/kernel/pci_sun4v.c16
-rw-r--r--block/ll_rw_blk.c1
-rw-r--r--drivers/block/cciss.c11
-rw-r--r--drivers/scsi/ide-scsi.c8
-rw-r--r--drivers/scsi/scsi_lib.c2
-rw-r--r--lib/swiotlb.c2
10 files changed, 62 insertions, 47 deletions
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 4338f4123f31..3c95f4184b99 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1179,7 +1179,6 @@ sba_fill_pdir(
u64 *pdirp = NULL;
unsigned long dma_offset = 0;
- dma_sg--;
while (nents-- > 0) {
int cnt = startsg->dma_length;
startsg->dma_length = 0;
@@ -1201,7 +1200,8 @@ sba_fill_pdir(
u32 pide = startsg->dma_address & ~PIDE_FLAG;
dma_offset = (unsigned long) pide & ~iovp_mask;
startsg->dma_address = 0;
- dma_sg = sg_next(dma_sg);
+ if (n_mappings)
+ dma_sg = sg_next(dma_sg);
dma_sg->dma_address = pide | ioc->ibase;
pdirp = &(ioc->pdir_base[pide >> iovp_shift]);
n_mappings++;
diff --git a/arch/sparc64/kernel/iommu.c b/arch/sparc64/kernel/iommu.c
index db3ffcf7a120..29af777d7ac9 100644
--- a/arch/sparc64/kernel/iommu.c
+++ b/arch/sparc64/kernel/iommu.c
@@ -10,7 +10,6 @@
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
-#include <linux/scatterlist.h>
#ifdef CONFIG_PCI
#include <linux/pci.h>
@@ -476,12 +475,11 @@ static void dma_4u_unmap_single(struct device *dev, dma_addr_t bus_addr,
#define SG_ENT_PHYS_ADDRESS(SG) \
(__pa(page_address((SG)->page)) + (SG)->offset)
-static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
- int nused, int nelems,
- unsigned long iopte_protection)
+static void fill_sg(iopte_t *iopte, struct scatterlist *sg,
+ int nused, int nelems,
+ unsigned long iopte_protection)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg_last(sg, nelems);
int i;
for (i = 0; i < nused; i++) {
@@ -517,6 +515,7 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
break;
}
sg = sg_next(sg);
+ nelems--;
}
pteval = iopte_protection | (pteval & IOPTE_PAGE);
@@ -530,18 +529,20 @@ static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
pteval = (pteval & IOPTE_PAGE) + len;
sg = sg_next(sg);
+ nelems--;
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
* detect a page crossing event.
*/
- while (sg != sg_end &&
+ while (nelems &&
(pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
(pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
sg = sg_next(sg);
+ nelems--;
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;
diff --git a/arch/sparc64/kernel/iommu_common.c b/arch/sparc64/kernel/iommu_common.c
index 12c93a3eee26..d7ca900ec51d 100644
--- a/arch/sparc64/kernel/iommu_common.c
+++ b/arch/sparc64/kernel/iommu_common.c
@@ -12,18 +12,22 @@
*/
#ifdef VERIFY_SG
-static int verify_lengths(struct scatterlist *sg, int nents, int npages)
+static int verify_lengths(struct scatterlist *sglist, int nents, int npages)
{
int sg_len, dma_len;
int i, pgcount;
+ struct scatterlist *sg;
sg_len = 0;
- for (i = 0; i < nents; i++)
- sg_len += sg[i].length;
+ for_each_sg(sglist, sg, nents, i)
+ sg_len += sg->length;
dma_len = 0;
- for (i = 0; i < nents && sg[i].dma_length; i++)
- dma_len += sg[i].dma_length;
+ for_each_sg(sglist, sg, nents, i) {
+ if (!sg->dma_length)
+ break;
+ dma_len += sg->dma_length;
+ }
if (sg_len != dma_len) {
printk("verify_lengths: Error, different, sg[%d] dma[%d]\n",
@@ -32,13 +36,16 @@ static int verify_lengths(struct scatterlist *sg, int nents, int npages)
}
pgcount = 0;
- for (i = 0; i < nents && sg[i].dma_length; i++) {
+ for_each_sg(sglist, sg, nents, i) {
unsigned long start, end;
- start = sg[i].dma_address;
+ if (!sg->dma_length)
+ break;
+
+ start = sg->dma_address;
start = start & IO_PAGE_MASK;
- end = sg[i].dma_address + sg[i].dma_length;
+ end = sg->dma_address + sg->dma_length;
end = (end + (IO_PAGE_SIZE - 1)) & IO_PAGE_MASK;
pgcount += ((end - start) >> IO_PAGE_SHIFT);
@@ -113,7 +120,7 @@ static int verify_one_map(struct scatterlist *dma_sg, struct scatterlist **__sg,
if (dlen > 0 && ((daddr & ~IO_PAGE_MASK) == 0))
iopte++;
- sg++;
+ sg = sg_next(sg);
if (--nents <= 0)
break;
sgaddr = (unsigned long) (page_address(sg->page) + sg->offset);
@@ -147,7 +154,7 @@ static int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte)
nents = verify_one_map(dma_sg, &sg, nents, &iopte);
if (nents <= 0)
break;
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
if (dma_sg->dma_length == 0)
break;
}
@@ -169,22 +176,24 @@ static int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte)
return 0;
}
-void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages)
+void verify_sglist(struct scatterlist *sglist, int nents, iopte_t *iopte, int npages)
{
- if (verify_lengths(sg, nents, npages) < 0 ||
- verify_maps(sg, nents, iopte) < 0) {
+ struct scatterlist *sg;
+
+ if (verify_lengths(sglist, nents, npages) < 0 ||
+ verify_maps(sglist, nents, iopte) < 0) {
int i;
printk("verify_sglist: Crap, messed up mappings, dumping, iodma at ");
- printk("%016lx.\n", sg->dma_address & IO_PAGE_MASK);
+ printk("%016lx.\n", sglist->dma_address & IO_PAGE_MASK);
- for (i = 0; i < nents; i++) {
+ for_each_sg(sglist, sg, nents, i) {
printk("sg(%d): page_addr(%p) off(%x) length(%x) "
- "dma_address[%016lx] dma_length[%016lx]\n",
+ "dma_address[%016x] dma_length[%016x]\n",
i,
- page_address(sg[i].page), sg[i].offset,
- sg[i].length,
- sg[i].dma_address, sg[i].dma_length);
+ page_address(sg->page), sg->offset,
+ sg->length,
+ sg->dma_address, sg->dma_length);
}
}
@@ -205,12 +214,12 @@ unsigned long prepare_sg(struct scatterlist *sg, int nents)
while (--nents) {
unsigned long addr;
- sg++;
+ sg = sg_next(sg);
addr = (unsigned long) (page_address(sg->page) + sg->offset);
if (! VCONTIG(prev, addr)) {
dma_sg->dma_address = dent_addr;
dma_sg->dma_length = dent_len;
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
dent_addr = ((dent_addr +
dent_len +
diff --git a/arch/sparc64/kernel/iommu_common.h b/arch/sparc64/kernel/iommu_common.h
index ad791014419c..75b5a5814522 100644
--- a/arch/sparc64/kernel/iommu_common.h
+++ b/arch/sparc64/kernel/iommu_common.h
@@ -8,6 +8,7 @@
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
+#include <linux/scatterlist.h>
#include <asm/iommu.h>
#include <asm/scatterlist.h>
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index cacacfae5451..fe46ace3e59f 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -13,7 +13,6 @@
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/log2.h>
-#include <linux/scatterlist.h>
#include <asm/iommu.h>
#include <asm/irq.h>
@@ -369,12 +368,11 @@ static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
#define SG_ENT_PHYS_ADDRESS(SG) \
(__pa(page_address((SG)->page)) + (SG)->offset)
-static inline long fill_sg(long entry, struct device *dev,
- struct scatterlist *sg,
- int nused, int nelems, unsigned long prot)
+static long fill_sg(long entry, struct device *dev,
+ struct scatterlist *sg,
+ int nused, int nelems, unsigned long prot)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg_last(sg, nelems);
unsigned long flags;
int i;
@@ -415,6 +413,7 @@ static inline long fill_sg(long entry, struct device *dev,
break;
}
sg = sg_next(sg);
+ nelems--;
}
pteval = (pteval & IOPTE_PAGE);
@@ -433,19 +432,20 @@ static inline long fill_sg(long entry, struct device *dev,
pteval = (pteval & IOPTE_PAGE) + len;
sg = sg_next(sg);
+ nelems--;
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
* detect a page crossing event.
*/
- while ((pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+ while (nelems &&
+ (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
(pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
- if (sg == sg_end)
- break;
sg = sg_next(sg);
+ nelems--;
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 524404bd08c1..9e3f3cc85d0d 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1352,6 +1352,7 @@ new_segment:
sg = next_sg;
next_sg = sg_next(sg);
+ memset(sg, 0, sizeof(*sg));
sg->page = bvec->bv_page;
sg->length = nbytes;
sg->offset = bvec->bv_offset;
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index ca56a0e5cd5e..7c2cfde08f18 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3076,15 +3076,20 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
}
#endif
- /* Disabling DMA prefetch for the P600
- * An ASIC bug may result in a prefetch beyond
- * physical memory.
+ /* Disabling DMA prefetch and refetch for the P600.
+ * An ASIC bug may result in accesses to invalid memory addresses.
+ * We've disabled prefetch for some time now. Testing with XEN
+ * kernels revealed a bug in the refetch if dom0 resides on a P600.
*/
if(board_id == 0x3225103C) {
__u32 dma_prefetch;
+ __u32 dma_refetch;
dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
dma_prefetch |= 0x8000;
writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
+ pci_read_config_dword(pdev, PCI_COMMAND_PARITY, &dma_refetch);
+ dma_refetch |= 0x1;
+ pci_write_config_dword(pdev, PCI_COMMAND_PARITY, dma_refetch);
}
#ifdef CCISS_DEBUG
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index d297f64cd432..fa7ba64483fb 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -70,7 +70,7 @@ typedef struct idescsi_pc_s {
u8 *buffer; /* Data buffer */
u8 *current_position; /* Pointer into the above buffer */
struct scatterlist *sg; /* Scatter gather table */
- struct scatterlist *last_sg; /* Last sg element */
+ unsigned int sg_cnt; /* Number of entries in sg */
int b_count; /* Bytes transferred from current entry */
struct scsi_cmnd *scsi_cmd; /* SCSI command */
void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
@@ -192,7 +192,7 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- if (pc->sg == pc->last_sg)
+ if (!--pc->sg_cnt)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
@@ -229,7 +229,7 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- if (pc->sg == pc->last_sg)
+ if (!--pc->sg_cnt)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
@@ -807,7 +807,7 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
pc->buffer = NULL;
pc->sg = scsi_sglist(cmd);
- pc->last_sg = sg_last(pc->sg, cmd->use_sg);
+ pc->sg_cnt = scsi_sg_count(cmd);
pc->b_count = 0;
pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
pc->scsi_cmd = cmd;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aac8a02cbe80..0c86be71bb33 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -764,8 +764,6 @@ struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
if (unlikely(!sgl))
goto enomem;
- memset(sgl, 0, sizeof(*sgl) * sgp->size);
-
/*
* first loop through, set initial index and return value
*/
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c419ecf334c3..752fd95323f3 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -696,7 +696,7 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
/* Don't panic here, we expect map_sg users
to do proper error handling. */
swiotlb_full(hwdev, sg->length, dir, 0);
- swiotlb_unmap_sg(hwdev, sg - i, i, dir);
+ swiotlb_unmap_sg(hwdev, sgl, i, dir);
sgl[0].dma_length = 0;
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.