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powerpc/iommu: Update the generic code to use dynamic iommu page sizes 

This patch updates the generic iommu backend code to use the
it_page_shift field to determine the iommu page size instead of
using hardcoded values.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Alistair Popple 2013-12-09 18:17:03 +11:00 committed by Benjamin Herrenschmidt
parent 3a553170d3
commit d084775738
6 changed files with 88 additions and 65 deletions
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19
arch/powerpc/include/asm/iommu.h
View File

@ -35,17 +35,14 @@
#define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1))
#define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K)
#define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift)
#define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1))
#define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr))
/* Boot time flags */
extern int iommu_is_off;
extern int iommu_force_on;
/* Pure 2^n version of get_order */
static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
{
return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT_4K) + 1;
}
/*
* IOMAP_MAX_ORDER defines the largest contiguous block
* of dma space we can get. IOMAP_MAX_ORDER = 13
@ -82,6 +79,14 @@ struct iommu_table {
#endif
};
/* Pure 2^n version of get_order */
static inline __attribute_const__
int get_iommu_order(unsigned long size, struct iommu_table *tbl)
{
return __ilog2((size - 1) >> tbl->it_page_shift) + 1;
}
struct scatterlist;
static inline void set_iommu_table_base(struct device *dev, void *base)

4
arch/powerpc/kernel/dma-iommu.c
View File

@ -83,10 +83,10 @@ static int dma_iommu_dma_supported(struct device *dev, u64 mask)
return 0;
}
if (tbl->it_offset > (mask >> IOMMU_PAGE_SHIFT_4K)) {
if (tbl->it_offset > (mask >> tbl->it_page_shift)) {
dev_info(dev, "Warning: IOMMU offset too big for device mask\n");
dev_info(dev, "mask: 0x%08llx, table offset: 0x%08lx\n",
mask, tbl->it_offset << IOMMU_PAGE_SHIFT_4K);
mask, tbl->it_offset << tbl->it_page_shift);
return 0;
} else
return 1;

88
arch/powerpc/kernel/iommu.c
View File

@ -251,14 +251,13 @@ again:
if (dev)
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
1 << IOMMU_PAGE_SHIFT_4K);
1 << tbl->it_page_shift);
else
boundary_size = ALIGN(1UL << 32, 1 << IOMMU_PAGE_SHIFT_4K);
boundary_size = ALIGN(1UL << 32, 1 << tbl->it_page_shift);
/* 4GB boundary for iseries_hv_alloc and iseries_hv_map */
n = iommu_area_alloc(tbl->it_map, limit, start, npages,
tbl->it_offset, boundary_size >> IOMMU_PAGE_SHIFT_4K,
align_mask);
n = iommu_area_alloc(tbl->it_map, limit, start, npages, tbl->it_offset,
boundary_size >> tbl->it_page_shift, align_mask);
if (n == -1) {
if (likely(pass == 0)) {
/* First try the pool from the start */
@ -320,12 +319,12 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
return DMA_ERROR_CODE;
entry += tbl->it_offset; /* Offset into real TCE table */
ret = entry << IOMMU_PAGE_SHIFT_4K; /* Set the return dma address */
ret = entry << tbl->it_page_shift; /* Set the return dma address */
/* Put the TCEs in the HW table */
build_fail = ppc_md.tce_build(tbl, entry, npages,
(unsigned long)page & IOMMU_PAGE_MASK_4K,
direction, attrs);
(unsigned long)page &
IOMMU_PAGE_MASK(tbl), direction, attrs);
/* ppc_md.tce_build() only returns non-zero for transient errors.
* Clean up the table bitmap in this case and return
@ -352,7 +351,7 @@ static bool iommu_free_check(struct iommu_table *tbl, dma_addr_t dma_addr,
{
unsigned long entry, free_entry;
entry = dma_addr >> IOMMU_PAGE_SHIFT_4K;
entry = dma_addr >> tbl->it_page_shift;
free_entry = entry - tbl->it_offset;
if (((free_entry + npages) > tbl->it_size) ||
@ -401,7 +400,7 @@ static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
unsigned long flags;
struct iommu_pool *pool;
entry = dma_addr >> IOMMU_PAGE_SHIFT_4K;
entry = dma_addr >> tbl->it_page_shift;
free_entry = entry - tbl->it_offset;
pool = get_pool(tbl, free_entry);
@ -468,13 +467,13 @@ int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
}
/* Allocate iommu entries for that segment */
vaddr = (unsigned long) sg_virt(s);
npages = iommu_num_pages(vaddr, slen, IOMMU_PAGE_SIZE_4K);
npages = iommu_num_pages(vaddr, slen, IOMMU_PAGE_SIZE(tbl));
align = 0;
if (IOMMU_PAGE_SHIFT_4K < PAGE_SHIFT && slen >= PAGE_SIZE &&
if (tbl->it_page_shift < PAGE_SHIFT && slen >= PAGE_SIZE &&
(vaddr & ~PAGE_MASK) == 0)
align = PAGE_SHIFT - IOMMU_PAGE_SHIFT_4K;
align = PAGE_SHIFT - tbl->it_page_shift;
entry = iommu_range_alloc(dev, tbl, npages, &handle,
mask >> IOMMU_PAGE_SHIFT_4K, align);
mask >> tbl->it_page_shift, align);
DBG(" - vaddr: %lx, size: %lx\n", vaddr, slen);
@ -489,16 +488,16 @@ int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
/* Convert entry to a dma_addr_t */
entry += tbl->it_offset;
dma_addr = entry << IOMMU_PAGE_SHIFT_4K;
dma_addr |= (s->offset & ~IOMMU_PAGE_MASK_4K);
dma_addr = entry << tbl->it_page_shift;
dma_addr |= (s->offset & ~IOMMU_PAGE_MASK(tbl));
DBG(" - %lu pages, entry: %lx, dma_addr: %lx\n",
npages, entry, dma_addr);
/* Insert into HW table */
build_fail = ppc_md.tce_build(tbl, entry, npages,
vaddr & IOMMU_PAGE_MASK_4K,
direction, attrs);
vaddr & IOMMU_PAGE_MASK(tbl),
direction, attrs);
if(unlikely(build_fail))
goto failure;
@ -559,9 +558,9 @@ int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
if (s->dma_length != 0) {
unsigned long vaddr, npages;
vaddr = s->dma_address & IOMMU_PAGE_MASK_4K;
vaddr = s->dma_address & IOMMU_PAGE_MASK(tbl);
npages = iommu_num_pages(s->dma_address, s->dma_length,
IOMMU_PAGE_SIZE_4K);
IOMMU_PAGE_SIZE(tbl));
__iommu_free(tbl, vaddr, npages);
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
@ -592,7 +591,7 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
if (sg->dma_length == 0)
break;
npages = iommu_num_pages(dma_handle, sg->dma_length,
IOMMU_PAGE_SIZE_4K);
IOMMU_PAGE_SIZE(tbl));
__iommu_free(tbl, dma_handle, npages);
sg = sg_next(sg);
}
@ -676,7 +675,7 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
set_bit(0, tbl->it_map);
/* We only split the IOMMU table if we have 1GB or more of space */
if ((tbl->it_size << IOMMU_PAGE_SHIFT_4K) >= (1UL * 1024 * 1024 * 1024))
if ((tbl->it_size << tbl->it_page_shift) >= (1UL * 1024 * 1024 * 1024))
tbl->nr_pools = IOMMU_NR_POOLS;
else
tbl->nr_pools = 1;
@ -768,16 +767,16 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
vaddr = page_address(page) + offset;
uaddr = (unsigned long)vaddr;
npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE_4K);
npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE(tbl));
if (tbl) {
align = 0;
if (IOMMU_PAGE_SHIFT_4K < PAGE_SHIFT && size >= PAGE_SIZE &&
if (tbl->it_page_shift < PAGE_SHIFT && size >= PAGE_SIZE &&
((unsigned long)vaddr & ~PAGE_MASK) == 0)
align = PAGE_SHIFT - IOMMU_PAGE_SHIFT_4K;
align = PAGE_SHIFT - tbl->it_page_shift;
dma_handle = iommu_alloc(dev, tbl, vaddr, npages, direction,
mask >> IOMMU_PAGE_SHIFT_4K, align,
mask >> tbl->it_page_shift, align,
attrs);
if (dma_handle == DMA_ERROR_CODE) {
if (printk_ratelimit()) {
@ -786,7 +785,7 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
npages);
}
} else
dma_handle |= (uaddr & ~IOMMU_PAGE_MASK_4K);
dma_handle |= (uaddr & ~IOMMU_PAGE_MASK(tbl));
}
return dma_handle;
@ -801,7 +800,8 @@ void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
BUG_ON(direction == DMA_NONE);
if (tbl) {
npages = iommu_num_pages(dma_handle, size, IOMMU_PAGE_SIZE_4K);
npages = iommu_num_pages(dma_handle, size,
IOMMU_PAGE_SIZE(tbl));
iommu_free(tbl, dma_handle, npages);
}
}
@ -845,10 +845,10 @@ void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
memset(ret, 0, size);
/* Set up tces to cover the allocated range */
nio_pages = size >> IOMMU_PAGE_SHIFT_4K;
io_order = get_iommu_order(size);
nio_pages = size >> tbl->it_page_shift;
io_order = get_iommu_order(size, tbl);
mapping = iommu_alloc(dev, tbl, ret, nio_pages, DMA_BIDIRECTIONAL,
mask >> IOMMU_PAGE_SHIFT_4K, io_order, NULL);
mask >> tbl->it_page_shift, io_order, NULL);
if (mapping == DMA_ERROR_CODE) {
free_pages((unsigned long)ret, order);
return NULL;
@ -864,7 +864,7 @@ void iommu_free_coherent(struct iommu_table *tbl, size_t size,
unsigned int nio_pages;
size = PAGE_ALIGN(size);
nio_pages = size >> IOMMU_PAGE_SHIFT_4K;
nio_pages = size >> tbl->it_page_shift;
iommu_free(tbl, dma_handle, nio_pages);
size = PAGE_ALIGN(size);
free_pages((unsigned long)vaddr, get_order(size));
@ -935,10 +935,10 @@ int iommu_tce_clear_param_check(struct iommu_table *tbl,
if (tce_value)
return -EINVAL;
if (ioba & ~IOMMU_PAGE_MASK_4K)
if (ioba & ~IOMMU_PAGE_MASK(tbl))
return -EINVAL;
ioba >>= IOMMU_PAGE_SHIFT_4K;
ioba >>= tbl->it_page_shift;
if (ioba < tbl->it_offset)
return -EINVAL;
@ -955,13 +955,13 @@ int iommu_tce_put_param_check(struct iommu_table *tbl,
if (!(tce & (TCE_PCI_WRITE | TCE_PCI_READ)))
return -EINVAL;
if (tce & ~(IOMMU_PAGE_MASK_4K | TCE_PCI_WRITE | TCE_PCI_READ))
if (tce & ~(IOMMU_PAGE_MASK(tbl) | TCE_PCI_WRITE | TCE_PCI_READ))
return -EINVAL;
if (ioba & ~IOMMU_PAGE_MASK_4K)
if (ioba & ~IOMMU_PAGE_MASK(tbl))
return -EINVAL;
ioba >>= IOMMU_PAGE_SHIFT_4K;
ioba >>= tbl->it_page_shift;
if (ioba < tbl->it_offset)
return -EINVAL;
@ -1037,7 +1037,7 @@ int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
/* if (unlikely(ret))
pr_err("iommu_tce: %s failed on hwaddr=%lx ioba=%lx kva=%lx ret=%d\n",
__func__, hwaddr, entry << IOMMU_PAGE_SHIFT_4K,
__func__, hwaddr, entry << IOMMU_PAGE_SHIFT(tbl),
hwaddr, ret); */
return ret;
@ -1049,14 +1049,14 @@ int iommu_put_tce_user_mode(struct iommu_table *tbl, unsigned long entry,
{
int ret;
struct page *page = NULL;
unsigned long hwaddr, offset = tce & IOMMU_PAGE_MASK_4K & ~PAGE_MASK;
unsigned long hwaddr, offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
enum dma_data_direction direction = iommu_tce_direction(tce);
ret = get_user_pages_fast(tce & PAGE_MASK, 1,
direction != DMA_TO_DEVICE, &page);
if (unlikely(ret != 1)) {
/* pr_err("iommu_tce: get_user_pages_fast failed tce=%lx ioba=%lx ret=%d\n",
tce, entry << IOMMU_PAGE_SHIFT_4K, ret); */
tce, entry << IOMMU_PAGE_SHIFT(tbl), ret); */
return -EFAULT;
}
hwaddr = (unsigned long) page_address(page) + offset;
@ -1067,7 +1067,7 @@ int iommu_put_tce_user_mode(struct iommu_table *tbl, unsigned long entry,
if (ret < 0)
pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%d\n",
__func__, entry << IOMMU_PAGE_SHIFT_4K, tce, ret);
__func__, entry << tbl->it_page_shift, tce, ret);
return ret;
}
@ -1127,6 +1127,12 @@ int iommu_add_device(struct device *dev)
pr_debug("iommu_tce: adding %s to iommu group %d\n",
dev_name(dev), iommu_group_id(tbl->it_group));
if (PAGE_SIZE < IOMMU_PAGE_SIZE(tbl)) {
pr_err("iommu_tce: unsupported iommu page size.");
pr_err("%s has not been added\n", dev_name(dev));
return -EINVAL;
}
ret = iommu_group_add_device(tbl->it_group, dev);
if (ret < 0)
pr_err("iommu_tce: %s has not been added, ret=%d\n",

25
arch/powerpc/kernel/vio.c
View File

@ -518,16 +518,18 @@ static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
dma_addr_t ret = DMA_ERROR_CODE;
if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE_4K))) {
tbl = get_iommu_table_base(dev);
if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) {
atomic_inc(&viodev->cmo.allocs_failed);
return ret;
}
ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs);
if (unlikely(dma_mapping_error(dev, ret))) {
vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE_4K));
vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
atomic_inc(&viodev->cmo.allocs_failed);
}
@ -540,10 +542,12 @@ static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
tbl = get_iommu_table_base(dev);
dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs);
vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE_4K));
vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
}
static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
@ -551,12 +555,14 @@ static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
struct scatterlist *sgl;
int ret, count = 0;
size_t alloc_size = 0;
tbl = get_iommu_table_base(dev);
for (sgl = sglist; count < nelems; count++, sgl++)
alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE_4K);
alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
if (vio_cmo_alloc(viodev, alloc_size)) {
atomic_inc(&viodev->cmo.allocs_failed);
@ -572,7 +578,7 @@ static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
}
for (sgl = sglist, count = 0; count < ret; count++, sgl++)
alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE_4K);
alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
if (alloc_size)
vio_cmo_dealloc(viodev, alloc_size);
@ -585,12 +591,14 @@ static void vio_dma_iommu_unmap_sg(struct device *dev,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
struct scatterlist *sgl;
size_t alloc_size = 0;
int count = 0;
tbl = get_iommu_table_base(dev);
for (sgl = sglist; count < nelems; count++, sgl++)
alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE_4K);
alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);
@ -706,11 +714,14 @@ static int vio_cmo_bus_probe(struct vio_dev *viodev)
{
struct vio_cmo_dev_entry *dev_ent;
struct device *dev = &viodev->dev;
struct iommu_table *tbl;
struct vio_driver *viodrv = to_vio_driver(dev->driver);
unsigned long flags;
size_t size;
bool dma_capable = false;
tbl = get_iommu_table_base(dev);
/* A device requires entitlement if it has a DMA window property */
switch (viodev->family) {
case VDEVICE:
@ -737,7 +748,7 @@ static int vio_cmo_bus_probe(struct vio_dev *viodev)
}
viodev->cmo.desired =
IOMMU_PAGE_ALIGN_4K(viodrv->get_desired_dma(viodev));
IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev), tbl);
if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
viodev->cmo.desired = VIO_CMO_MIN_ENT;
size = VIO_CMO_MIN_ENT;

2
arch/powerpc/platforms/powernv/pci.c
View File

@ -762,8 +762,6 @@ static struct notifier_block tce_iommu_bus_nb = {
static int __init tce_iommu_bus_notifier_init(void)
{
BUILD_BUG_ON(PAGE_SIZE < IOMMU_PAGE_SIZE_4K);
bus_register_notifier(&pci_bus_type, &tce_iommu_bus_nb);
return 0;
}

15
drivers/net/ethernet/ibm/ibmveth.c
View File

@ -1276,31 +1276,34 @@ static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
{
struct net_device *netdev = dev_get_drvdata(&vdev->dev);
struct ibmveth_adapter *adapter;
struct iommu_table *tbl;
unsigned long ret;
int i;
int rxqentries = 1;
tbl = get_iommu_table_base(&vdev->dev);
/* netdev inits at probe time along with the structures we need below*/
if (netdev == NULL)
return IOMMU_PAGE_ALIGN_4K(IBMVETH_IO_ENTITLEMENT_DEFAULT);
return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
adapter = netdev_priv(netdev);
ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
ret += IOMMU_PAGE_ALIGN_4K(netdev->mtu);
ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
/* add the size of the active receive buffers */
if (adapter->rx_buff_pool[i].active)
ret +=
adapter->rx_buff_pool[i].size *
IOMMU_PAGE_ALIGN_4K(adapter->rx_buff_pool[i].
buff_size);
IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
buff_size, tbl);
rxqentries += adapter->rx_buff_pool[i].size;
}
/* add the size of the receive queue entries */
ret += IOMMU_PAGE_ALIGN_4K(
rxqentries * sizeof(struct ibmveth_rx_q_entry));
ret += IOMMU_PAGE_ALIGN(
rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
return ret;
}