*/
-#include <linux/config.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <asm/iommu.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
+#include <asm/kdump.h>
#define DBG(...)
static int novmerge = 1;
#endif
+static inline unsigned long iommu_num_pages(unsigned long vaddr,
+ unsigned long slen)
+{
+ unsigned long npages;
+
+ npages = IOMMU_PAGE_ALIGN(vaddr + slen) - (vaddr & IOMMU_PAGE_MASK);
+ npages >>= IOMMU_PAGE_SHIFT;
+
+ return npages;
+}
+
static int __init setup_iommu(char *str)
{
if (!strcmp(str, "novmerge"))
/* This allocator was derived from x86_64's bit string search */
/* Sanity check */
- if (unlikely(npages) == 0) {
+ if (unlikely(npages == 0)) {
if (printk_ratelimit())
WARN_ON(1);
return DMA_ERROR_CODE;
}
entry += tbl->it_offset; /* Offset into real TCE table */
- ret = entry << PAGE_SHIFT; /* Set the return dma address */
+ ret = entry << IOMMU_PAGE_SHIFT; /* Set the return dma address */
/* Put the TCEs in the HW table */
- ppc_md.tce_build(tbl, entry, npages, (unsigned long)page & PAGE_MASK,
+ ppc_md.tce_build(tbl, entry, npages, (unsigned long)page & IOMMU_PAGE_MASK,
direction);
unsigned long entry, free_entry;
unsigned long i;
- entry = dma_addr >> PAGE_SHIFT;
+ entry = dma_addr >> IOMMU_PAGE_SHIFT;
free_entry = entry - tbl->it_offset;
if (((free_entry + npages) > tbl->it_size) ||
/* Init first segment length for backout at failure */
outs->dma_length = 0;
- DBG("mapping %d elements:\n", nelems);
+ DBG("sg mapping %d elements:\n", nelems);
spin_lock_irqsave(&(tbl->it_lock), flags);
}
/* Allocate iommu entries for that segment */
vaddr = (unsigned long)page_address(s->page) + s->offset;
- npages = PAGE_ALIGN(vaddr + slen) - (vaddr & PAGE_MASK);
- npages >>= PAGE_SHIFT;
- entry = iommu_range_alloc(tbl, npages, &handle, mask >> PAGE_SHIFT, 0);
+ npages = iommu_num_pages(vaddr, slen);
+ entry = iommu_range_alloc(tbl, npages, &handle, mask >> IOMMU_PAGE_SHIFT, 0);
DBG(" - vaddr: %lx, size: %lx\n", vaddr, slen);
/* Convert entry to a dma_addr_t */
entry += tbl->it_offset;
- dma_addr = entry << PAGE_SHIFT;
- dma_addr |= s->offset;
+ dma_addr = entry << IOMMU_PAGE_SHIFT;
+ dma_addr |= (s->offset & ~IOMMU_PAGE_MASK);
- DBG(" - %lx pages, entry: %lx, dma_addr: %lx\n",
+ DBG(" - %lu pages, entry: %lx, dma_addr: %lx\n",
npages, entry, dma_addr);
/* Insert into HW table */
- ppc_md.tce_build(tbl, entry, npages, vaddr & PAGE_MASK, direction);
+ ppc_md.tce_build(tbl, entry, npages, vaddr & IOMMU_PAGE_MASK, direction);
/* If we are in an open segment, try merging */
if (segstart != s) {
DBG(" can't merge, new segment.\n");
} else {
outs->dma_length += s->length;
- DBG(" merged, new len: %lx\n", outs->dma_length);
+ DBG(" merged, new len: %ux\n", outs->dma_length);
}
}
if (s->dma_length != 0) {
unsigned long vaddr, npages;
- vaddr = s->dma_address & PAGE_MASK;
- npages = (PAGE_ALIGN(s->dma_address + s->dma_length) - vaddr)
- >> PAGE_SHIFT;
+ vaddr = s->dma_address & IOMMU_PAGE_MASK;
+ npages = iommu_num_pages(s->dma_address, s->dma_length);
__iommu_free(tbl, vaddr, npages);
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
if (sglist->dma_length == 0)
break;
- npages = (PAGE_ALIGN(dma_handle + sglist->dma_length)
- - (dma_handle & PAGE_MASK)) >> PAGE_SHIFT;
+ npages = iommu_num_pages(dma_handle,sglist->dma_length);
__iommu_free(tbl, dma_handle, npages);
sglist++;
}
tbl->it_largehint = tbl->it_halfpoint;
spin_lock_init(&tbl->it_lock);
+#ifdef CONFIG_CRASH_DUMP
+ if (ppc_md.tce_get) {
+ unsigned long index, tceval;
+ unsigned long tcecount = 0;
+
+ /*
+ * Reserve the existing mappings left by the first kernel.
+ */
+ for (index = 0; index < tbl->it_size; index++) {
+ tceval = ppc_md.tce_get(tbl, index + tbl->it_offset);
+ /*
+ * Freed TCE entry contains 0x7fffffffffffffff on JS20
+ */
+ if (tceval && (tceval != 0x7fffffffffffffffUL)) {
+ __set_bit(index, tbl->it_map);
+ tcecount++;
+ }
+ }
+ if ((tbl->it_size - tcecount) < KDUMP_MIN_TCE_ENTRIES) {
+ printk(KERN_WARNING "TCE table is full; ");
+ printk(KERN_WARNING "freeing %d entries for the kdump boot\n",
+ KDUMP_MIN_TCE_ENTRIES);
+ for (index = tbl->it_size - KDUMP_MIN_TCE_ENTRIES;
+ index < tbl->it_size; index++)
+ __clear_bit(index, tbl->it_map);
+ }
+ }
+#else
/* Clear the hardware table in case firmware left allocations in it */
ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
+#endif
if (!welcomed) {
printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n",
BUG_ON(direction == DMA_NONE);
uaddr = (unsigned long)vaddr;
- npages = PAGE_ALIGN(uaddr + size) - (uaddr & PAGE_MASK);
- npages >>= PAGE_SHIFT;
+ npages = iommu_num_pages(uaddr, size);
if (tbl) {
dma_handle = iommu_alloc(tbl, vaddr, npages, direction,
- mask >> PAGE_SHIFT, 0);
+ mask >> IOMMU_PAGE_SHIFT, 0);
if (dma_handle == DMA_ERROR_CODE) {
if (printk_ratelimit()) {
printk(KERN_INFO "iommu_alloc failed, "
tbl, vaddr, npages);
}
} else
- dma_handle |= (uaddr & ~PAGE_MASK);
+ dma_handle |= (uaddr & ~IOMMU_PAGE_MASK);
}
return dma_handle;
void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
{
+ unsigned int npages;
+
BUG_ON(direction == DMA_NONE);
- if (tbl)
- iommu_free(tbl, dma_handle, (PAGE_ALIGN(dma_handle + size) -
- (dma_handle & PAGE_MASK)) >> PAGE_SHIFT);
+ if (tbl) {
+ npages = iommu_num_pages(dma_handle, size);
+ iommu_free(tbl, dma_handle, npages);
+ }
}
/* Allocates a contiguous real buffer and creates mappings over it.
{
void *ret = NULL;
dma_addr_t mapping;
- unsigned int npages, order;
+ unsigned int order;
+ unsigned int nio_pages, io_order;
struct page *page;
size = PAGE_ALIGN(size);
- npages = size >> PAGE_SHIFT;
order = get_order(size);
/*
memset(ret, 0, size);
/* Set up tces to cover the allocated range */
- mapping = iommu_alloc(tbl, ret, npages, DMA_BIDIRECTIONAL,
- mask >> PAGE_SHIFT, order);
+ nio_pages = size >> IOMMU_PAGE_SHIFT;
+ io_order = get_iommu_order(size);
+ mapping = iommu_alloc(tbl, ret, nio_pages, DMA_BIDIRECTIONAL,
+ mask >> IOMMU_PAGE_SHIFT, io_order);
if (mapping == DMA_ERROR_CODE) {
free_pages((unsigned long)ret, order);
return NULL;
void iommu_free_coherent(struct iommu_table *tbl, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
- unsigned int npages;
-
if (tbl) {
+ unsigned int nio_pages;
+
+ size = PAGE_ALIGN(size);
+ nio_pages = size >> IOMMU_PAGE_SHIFT;
+ iommu_free(tbl, dma_handle, nio_pages);
size = PAGE_ALIGN(size);
- npages = size >> PAGE_SHIFT;
- iommu_free(tbl, dma_handle, npages);
free_pages((unsigned long)vaddr, get_order(size));
}
}
projects / linux-drm-fsl-dcu.git / blobdiff