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[POWERPC] Add support to cell_iommu_setup_page_tables() for multiple windows 

Add support to cell_iommu_setup_page_tables() for handling two windows,
the dynamic window and the fixed window.  A fixed window size of 0
indicates that there is no fixed window at all.

Currently there are no callers who pass a non-zero fixed window, but the
upcoming fixed IOMMU mapping patch will change that.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2008-01-30 01:14:01 +11:00 committed by Paul Mackerras
parent 86865771ea
commit 4134791728
1 changed files with 10 additions and 5 deletions
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15
arch/powerpc/platforms/cell/iommu.c
View File

@ -307,14 +307,19 @@ static int cell_iommu_find_ioc(int nid, unsigned long *base)
}
static void cell_iommu_setup_page_tables(struct cbe_iommu *iommu,
unsigned long base, unsigned long size)
unsigned long dbase, unsigned long dsize,
unsigned long fbase, unsigned long fsize)
{
struct page *page;
int i;
unsigned long reg, segments, pages_per_segment, ptab_size, stab_size,
n_pte_pages;
n_pte_pages, base;
segments = size >> IO_SEGMENT_SHIFT;
base = dbase;
if (fsize != 0)
base = min(fbase, dbase);
segments = max(dbase + dsize, fbase + fsize) >> IO_SEGMENT_SHIFT;
pages_per_segment = 1ull << IO_PAGENO_BITS;
pr_debug("%s: iommu[%d]: segments: %lu, pages per segment: %lu\n",
@ -366,7 +371,7 @@ static void cell_iommu_setup_page_tables(struct cbe_iommu *iommu,
}
pr_debug("Setting up IOMMU stab:\n");
for (i = 0; i * (1ul << IO_SEGMENT_SHIFT) < size; i++) {
for (i = base >> IO_SEGMENT_SHIFT; i < segments; i++) {
iommu->stab[i] = reg |
(__pa(iommu->ptab) + n_pte_pages * IOMMU_PAGE_SIZE * i);
pr_debug("\t[%d] 0x%016lx\n", i, iommu->stab[i]);
@ -417,7 +422,7 @@ static void cell_iommu_enable_hardware(struct cbe_iommu *iommu)
static void cell_iommu_setup_hardware(struct cbe_iommu *iommu,
unsigned long base, unsigned long size)
{
cell_iommu_setup_page_tables(iommu, base, size);
cell_iommu_setup_page_tables(iommu, base, size, 0, 0);
cell_iommu_enable_hardware(iommu);
}