List,
With a slightly modified patched (copied below) I have reached a point
where I am no more seeing errors like segmentation fault, bus error
(which was due to memory corruption I believe).
How ever I am still seeing some kind of file corruption.
I believe this file corruption happening because cache is not getting
invalidated before a highmem dma. I am not sure which routine to call to
invalidate cache for a highmem address.
Hope to see response from linux-mips gurus
Thank you,
Anoop
--- arch/mips/mm/dma-noncoherent.c.orig 2010-08-02 23:53:17.000000000
+0530
+++ arch/mips/mm/dma-noncoherent.c 2010-08-06 00:17:21.000000000
+0530
@@ -131,13 +131,14 @@
for (i = 0; i < nents; i++, sg++) {
unsigned long addr;
-
- addr = (unsigned long) page_address(sg->page);
- if (addr) {
- __dma_sync(addr + sg->offset, sg->length,
direction);
- sg->dma_address =
(dma_addr_t)page_to_phys(sg->page)
- + sg->offset;
+ if (!PageHighMem(sg->page)){
+ addr = (unsigned long)page_address(sg->page) +
sg->offset;
+ __dma_sync(addr , sg->length, direction);
}
+
+ sg->dma_address = (dma_addr_t)page_to_phys(sg->page)
+ + sg->offset;
+
}
return nents;
@@ -187,9 +188,10 @@
return;
for (i = 0; i < nhwentries; i++, sg++) {
- addr = (unsigned long) page_address(sg->page);
- if (addr)
- __dma_sync(addr + sg->offset, sg->length,
direction);
+ if (!PageHighMem(sg->page)){
+ addr = (unsigned long)page_address(sg->page) +
sg->offset;
+ __dma_sync(addr , sg->length, direction);
+ }
}
}
