powerpc/iommu: Add it_page_shift field to determine iommu page size

This patch adds a it_page_shift field to struct iommu_table and
initiliases it to 4K for all platforms.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

7 files changed, 24 insertions, 13 deletions

diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 0869c7e74421..7c928342f3f5 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -76,6 +76,7 @@ struct iommu_table {
         struct iommu_pool large_pool;
         struct iommu_pool pools[IOMMU_NR_POOLS];
         unsigned long *it_map;       /* A simple allocation bitmap for now */
+        unsigned long  it_page_shift;/* table iommu page size */
 #ifdef CONFIG_IOMMU_API
         struct iommu_group *it_group;
 #endif
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 2e89fa350763..170ac24a0106 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -1177,9 +1177,10 @@ static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
                             &tbl->it_index, &offset, &size);
 
         /* TCE table size - measured in tce entries */
-        tbl->it_size = size >> IOMMU_PAGE_SHIFT_4K;
+        tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
+        tbl->it_size = size >> tbl->it_page_shift;
         /* offset for VIO should always be 0 */
-        tbl->it_offset = offset >> IOMMU_PAGE_SHIFT_4K;
+        tbl->it_offset = offset >> tbl->it_page_shift;
         tbl->it_busno = 0;
         tbl->it_type = TCE_VB;
         tbl->it_blocksize = 16;
diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index fc61b908eaf0..2b90ff8a93be 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -197,7 +197,7 @@ static int tce_build_cell(struct iommu_table *tbl, long index, long npages,
 
         io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset);
 
-        for (i = 0; i < npages; i++, uaddr += IOMMU_PAGE_SIZE_4K)
+        for (i = 0; i < npages; i++, uaddr += tbl->it_page_shift)
                 io_pte[i] = base_pte | (__pa(uaddr) & CBE_IOPTE_RPN_Mask);
 
         mb();
@@ -487,8 +487,10 @@ cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
         window->table.it_blocksize = 16;
         window->table.it_base = (unsigned long)iommu->ptab;
         window->table.it_index = iommu->nid;
-        window->table.it_offset = (offset >> IOMMU_PAGE_SHIFT_4K) + pte_offset;
-        window->table.it_size = size >> IOMMU_PAGE_SHIFT_4K;
+        window->table.it_page_shift = IOMMU_PAGE_SHIFT_4K;
+        window->table.it_offset =
+                (offset >> window->table.it_page_shift) + pte_offset;
+        window->table.it_size = size >> window->table.it_page_shift;
 
         iommu_init_table(&window->table, iommu->nid);
 
diff --git a/arch/powerpc/platforms/pasemi/iommu.c b/arch/powerpc/platforms/pasemi/iommu.c
index 7d2d036754b5..2e576f2ae442 100644
--- a/arch/powerpc/platforms/pasemi/iommu.c
+++ b/arch/powerpc/platforms/pasemi/iommu.c
@@ -138,8 +138,11 @@ static void iommu_table_iobmap_setup(void)
         pr_debug(" -> %s\n", __func__);
         iommu_table_iobmap.it_busno = 0;
         iommu_table_iobmap.it_offset = 0;
+        iommu_table_iobmap.it_page_shift = IOBMAP_PAGE_SHIFT;
+
         /* it_size is in number of entries */
-        iommu_table_iobmap.it_size = 0x80000000 >> IOBMAP_PAGE_SHIFT;
+        iommu_table_iobmap.it_size =
+                0x80000000 >> iommu_table_iobmap.it_page_shift;
 
         /* Initialize the common IOMMU code */
         iommu_table_iobmap.it_base = (unsigned long)iob_l2_base;
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 7f4d857668a9..569b46423a93 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -564,7 +564,8 @@ void pnv_pci_setup_iommu_table(struct iommu_table *tbl,
 {
         tbl->it_blocksize = 16;
         tbl->it_base = (unsigned long)tce_mem;
-        tbl->it_offset = dma_offset >> IOMMU_PAGE_SHIFT_4K;
+        tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
+        tbl->it_offset = dma_offset >> tbl->it_page_shift;
         tbl->it_index = 0;
         tbl->it_size = tce_size >> 3;
         tbl->it_busno = 0;
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 1b7531ce0c0c..e0299183ae54 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -486,9 +486,10 @@ static void iommu_table_setparms(struct pci_controller *phb,
                 memset((void *)tbl->it_base, 0, *sizep);
 
         tbl->it_busno = phb->bus->number;
+        tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
 
         /* Units of tce entries */
-        tbl->it_offset = phb->dma_window_base_cur >> IOMMU_PAGE_SHIFT_4K;
+        tbl->it_offset = phb->dma_window_base_cur >> tbl->it_page_shift;
 
         /* Test if we are going over 2GB of DMA space */
         if (phb->dma_window_base_cur + phb->dma_window_size > 0x80000000ul) {
@@ -499,7 +500,7 @@ static void iommu_table_setparms(struct pci_controller *phb,
         phb->dma_window_base_cur += phb->dma_window_size;
 
         /* Set the tce table size - measured in entries */
-        tbl->it_size = phb->dma_window_size >> IOMMU_PAGE_SHIFT_4K;
+        tbl->it_size = phb->dma_window_size >> tbl->it_page_shift;
 
         tbl->it_index = 0;
         tbl->it_blocksize = 16;
@@ -537,11 +538,12 @@ static void iommu_table_setparms_lpar(struct pci_controller *phb,
         of_parse_dma_window(dn, dma_window, &tbl->it_index, &offset, &size);
 
         tbl->it_busno = phb->bus->number;
+        tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
         tbl->it_base   = 0;
         tbl->it_blocksize  = 16;
         tbl->it_type = TCE_PCI;
-        tbl->it_offset = offset >> IOMMU_PAGE_SHIFT_4K;
-        tbl->it_size = size >> IOMMU_PAGE_SHIFT_4K;
+        tbl->it_offset = offset >> tbl->it_page_shift;
+        tbl->it_size = size >> tbl->it_page_shift;
 }
 
 static void pci_dma_bus_setup_pSeries(struct pci_bus *bus)
diff --git a/arch/powerpc/platforms/wsp/wsp_pci.c b/arch/powerpc/platforms/wsp/wsp_pci.c
index 8a589618551e..9a15e5b39bb8 100644
--- a/arch/powerpc/platforms/wsp/wsp_pci.c
+++ b/arch/powerpc/platforms/wsp/wsp_pci.c
@@ -381,8 +381,9 @@ static struct wsp_dma_table *wsp_pci_create_dma32_table(struct wsp_phb *phb,
 
         /* Init bits and pieces */
         tbl->table.it_blocksize = 16;
-        tbl->table.it_offset = addr >> IOMMU_PAGE_SHIFT_4K;
-        tbl->table.it_size = size >> IOMMU_PAGE_SHIFT_4K;
+        tbl->table.it_page_shift = IOMMU_PAGE_SHIFT_4K;
+        tbl->table.it_offset = addr >> tbl->table.it_page_shift;
+        tbl->table.it_size = size >> tbl->table.it_page_shift;
 
         /*
          * It's already blank but we clear it anyway.