#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/dma-mapping.h>
-#include <linux/bitops.h>
+#include <linux/bitmap.h>
#include <linux/iommu-helper.h>
+#include <linux/crash_dump.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/iommu.h>
static int protect4gb = 1;
-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 void __iommu_free(struct iommu_table *, dma_addr_t, unsigned int);
static int __init setup_protect4gb(char *str)
{
static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
void *page, unsigned int npages,
enum dma_data_direction direction,
- unsigned long mask, unsigned int align_order)
+ unsigned long mask, unsigned int align_order,
+ struct dma_attrs *attrs)
{
unsigned long entry, flags;
dma_addr_t ret = DMA_ERROR_CODE;
+ int build_fail;
spin_lock_irqsave(&(tbl->it_lock), flags);
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 & IOMMU_PAGE_MASK,
- direction);
+ build_fail = ppc_md.tce_build(tbl, entry, npages,
+ (unsigned long)page & IOMMU_PAGE_MASK,
+ direction, attrs);
+
+ /* ppc_md.tce_build() only returns non-zero for transient errors.
+ * Clean up the table bitmap in this case and return
+ * DMA_ERROR_CODE. For all other errors the functionality is
+ * not altered.
+ */
+ if (unlikely(build_fail)) {
+ __iommu_free(tbl, ret, npages);
+ spin_unlock_irqrestore(&(tbl->it_lock), flags);
+ return DMA_ERROR_CODE;
+ }
/* Flush/invalidate TLB caches if necessary */
if (ppc_md.tce_flush)
if (printk_ratelimit()) {
printk(KERN_INFO "iommu_free: invalid entry\n");
printk(KERN_INFO "\tentry = 0x%lx\n", entry);
- printk(KERN_INFO "\tdma_addr = 0x%lx\n", (u64)dma_addr);
- printk(KERN_INFO "\tTable = 0x%lx\n", (u64)tbl);
- printk(KERN_INFO "\tbus# = 0x%lx\n", (u64)tbl->it_busno);
- printk(KERN_INFO "\tsize = 0x%lx\n", (u64)tbl->it_size);
- printk(KERN_INFO "\tstartOff = 0x%lx\n", (u64)tbl->it_offset);
- printk(KERN_INFO "\tindex = 0x%lx\n", (u64)tbl->it_index);
+ printk(KERN_INFO "\tdma_addr = 0x%llx\n", (u64)dma_addr);
+ printk(KERN_INFO "\tTable = 0x%llx\n", (u64)tbl);
+ printk(KERN_INFO "\tbus# = 0x%llx\n", (u64)tbl->it_busno);
+ printk(KERN_INFO "\tsize = 0x%llx\n", (u64)tbl->it_size);
+ printk(KERN_INFO "\tstartOff = 0x%llx\n", (u64)tbl->it_offset);
+ printk(KERN_INFO "\tindex = 0x%llx\n", (u64)tbl->it_index);
WARN_ON(1);
}
return;
}
ppc_md.tce_free(tbl, entry, npages);
- iommu_area_free(tbl->it_map, free_entry, npages);
+ bitmap_clear(tbl->it_map, free_entry, npages);
}
static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
dma_addr_t dma_next = 0, dma_addr;
unsigned long flags;
struct scatterlist *s, *outs, *segstart;
- int outcount, incount, i;
+ int outcount, incount, i, build_fail = 0;
unsigned int align;
unsigned long handle;
unsigned int max_seg_size;
}
/* Allocate iommu entries for that segment */
vaddr = (unsigned long) sg_virt(s);
- npages = iommu_num_pages(vaddr, slen);
+ npages = iommu_num_pages(vaddr, slen, IOMMU_PAGE_SIZE);
align = 0;
if (IOMMU_PAGE_SHIFT < PAGE_SHIFT && slen >= PAGE_SIZE &&
(vaddr & ~PAGE_MASK) == 0)
npages, entry, dma_addr);
/* Insert into HW table */
- ppc_md.tce_build(tbl, entry, npages, vaddr & IOMMU_PAGE_MASK, direction);
+ build_fail = ppc_md.tce_build(tbl, entry, npages,
+ vaddr & IOMMU_PAGE_MASK,
+ direction, attrs);
+ if(unlikely(build_fail))
+ goto failure;
/* If we are in an open segment, try merging */
if (segstart != s) {
unsigned long vaddr, npages;
vaddr = s->dma_address & IOMMU_PAGE_MASK;
- npages = iommu_num_pages(s->dma_address, s->dma_length);
+ npages = iommu_num_pages(s->dma_address, s->dma_length,
+ IOMMU_PAGE_SIZE);
__iommu_free(tbl, vaddr, npages);
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
if (sg->dma_length == 0)
break;
- npages = iommu_num_pages(dma_handle, sg->dma_length);
+ npages = iommu_num_pages(dma_handle, sg->dma_length,
+ IOMMU_PAGE_SIZE);
__iommu_free(tbl, dma_handle, npages);
sg = sg_next(sg);
}
spin_unlock_irqrestore(&(tbl->it_lock), flags);
}
+static void iommu_table_clear(struct iommu_table *tbl)
+{
+ if (!is_kdump_kernel()) {
+ /* Clear the table in case firmware left allocations in it */
+ ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
+ return;
+ }
+
+#ifdef CONFIG_CRASH_DUMP
+ if (ppc_md.tce_get) {
+ unsigned long index, tceval, 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; freeing ");
+ printk(KERN_WARNING "%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);
+ }
+ }
+#endif
+}
+
/*
* Build a iommu_table structure. This contains a bit map which
* is used to manage allocation of the tce space.
tbl->it_largehint = tbl->it_halfpoint;
spin_lock_init(&tbl->it_lock);
-#ifdef CONFIG_CRASH_DUMP
- if (ppc_md.tce_get) {
- unsigned long index;
- unsigned long 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
+ iommu_table_clear(tbl);
if (!welcomed) {
printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n",
}
/* Creates TCEs for a user provided buffer. The user buffer must be
- * contiguous real kernel storage (not vmalloc). The address of the buffer
- * passed here is the kernel (virtual) address of the buffer. The buffer
- * need not be page aligned, the dma_addr_t returned will point to the same
- * byte within the page as vaddr.
+ * contiguous real kernel storage (not vmalloc). The address passed here
+ * comprises a page address and offset into that page. The dma_addr_t
+ * returned will point to the same byte within the page as was passed in.
*/
-dma_addr_t iommu_map_single(struct device *dev, struct iommu_table *tbl,
- void *vaddr, size_t size, unsigned long mask,
- enum dma_data_direction direction, struct dma_attrs *attrs)
+dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
+ struct page *page, unsigned long offset, size_t size,
+ unsigned long mask, enum dma_data_direction direction,
+ struct dma_attrs *attrs)
{
dma_addr_t dma_handle = DMA_ERROR_CODE;
+ void *vaddr;
unsigned long uaddr;
unsigned int npages, align;
BUG_ON(direction == DMA_NONE);
+ vaddr = page_address(page) + offset;
uaddr = (unsigned long)vaddr;
- npages = iommu_num_pages(uaddr, size);
+ npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE);
if (tbl) {
align = 0;
align = PAGE_SHIFT - IOMMU_PAGE_SHIFT;
dma_handle = iommu_alloc(dev, tbl, vaddr, npages, direction,
- mask >> IOMMU_PAGE_SHIFT, align);
+ mask >> IOMMU_PAGE_SHIFT, align,
+ attrs);
if (dma_handle == DMA_ERROR_CODE) {
if (printk_ratelimit()) {
printk(KERN_INFO "iommu_alloc failed, "
return dma_handle;
}
-void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
- size_t size, enum dma_data_direction direction,
- struct dma_attrs *attrs)
+void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction,
+ struct dma_attrs *attrs)
{
unsigned int npages;
BUG_ON(direction == DMA_NONE);
if (tbl) {
- npages = iommu_num_pages(dma_handle, size);
+ npages = iommu_num_pages(dma_handle, size, IOMMU_PAGE_SIZE);
iommu_free(tbl, dma_handle, npages);
}
}
nio_pages = size >> IOMMU_PAGE_SHIFT;
io_order = get_iommu_order(size);
mapping = iommu_alloc(dev, tbl, ret, nio_pages, DMA_BIDIRECTIONAL,
- mask >> IOMMU_PAGE_SHIFT, io_order);
+ mask >> IOMMU_PAGE_SHIFT, io_order, NULL);
if (mapping == DMA_ERROR_CODE) {
free_pages((unsigned long)ret, order);
return NULL;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff