3  * IOMMU implementation for Cell Broadband Processor Architecture
24 #include <asm/iommu.h>
95 /* IOMMU sizing */
104 	struct cbe_iommu *iommu;  member
131 static void invalidate_tce_cache(struct cbe_iommu *iommu, unsigned long *pte,  in invalidate_tce_cache()  argument
138 	reg = iommu->xlate_regs + IOC_IOPT_CacheInvd;  in invalidate_tce_cache()
195 	invalidate_tce_cache(window->iommu, io_pte, npages);  in tce_build_cell()
218 		__pa(window->iommu->pad_page) |  in tce_free_cell()
229 	invalidate_tce_cache(window->iommu, io_pte, npages);  in tce_free_cell()
235 	struct cbe_iommu *iommu = data;  in ioc_interrupt()  local
237 	stat = in_be64(iommu->xlate_regs + IOC_IO_ExcpStat);  in ioc_interrupt()
241 	printk(KERN_ERR "iommu: DMA exception 0x%016lx\n", stat);  in ioc_interrupt()
253 	out_be64(iommu->xlate_regs + IOC_IO_ExcpStat, stat);  in ioc_interrupt()
270 			printk(KERN_ERR "iommu: can't get address for %pOF\n",  in cell_iommu_find_ioc()
298 static void __init cell_iommu_setup_stab(struct cbe_iommu *iommu,  in cell_iommu_setup_stab()  argument
307 	pr_debug("%s: iommu[%d]: segments: %lu\n",  in cell_iommu_setup_stab()
308 			__func__, iommu->nid, segments);  in cell_iommu_setup_stab()
312 	page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(stab_size));  in cell_iommu_setup_stab()
314 	iommu->stab = page_address(page);  in cell_iommu_setup_stab()
315 	memset(iommu->stab, 0, stab_size);  in cell_iommu_setup_stab()
318 static unsigned long *__init cell_iommu_alloc_ptab(struct cbe_iommu *iommu,  in cell_iommu_alloc_ptab()  argument
335 	pr_debug("%s: iommu[%d]: ptab_size: %lu, order: %d\n", __func__,  in cell_iommu_alloc_ptab()
336 			iommu->nid, ptab_size, get_order(ptab_size));  in cell_iommu_alloc_ptab()
337 	page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(ptab_size));  in cell_iommu_alloc_ptab()
346 	pr_debug("%s: iommu[%d]: stab at %p, ptab at %p, n_pte_pages: %lu\n",  in cell_iommu_alloc_ptab()
347 			__func__, iommu->nid, iommu->stab, ptab,  in cell_iommu_alloc_ptab()
364 	pr_debug("Setting up IOMMU stab:\n");  in cell_iommu_alloc_ptab()
370 		iommu->stab[i] = reg | (__pa(ptab) + (n_pte_pages << 12) *  in cell_iommu_alloc_ptab()
372 		pr_debug("\t[%d] 0x%016lx\n", i, iommu->stab[i]);  in cell_iommu_alloc_ptab()
378 static void __init cell_iommu_enable_hardware(struct cbe_iommu *iommu)  in cell_iommu_enable_hardware()  argument
384 	if (cell_iommu_find_ioc(iommu->nid, &xlate_base))  in cell_iommu_enable_hardware()
386 		      __func__, iommu->nid);  in cell_iommu_enable_hardware()
388 	iommu->xlate_regs = ioremap(xlate_base, IOC_Reg_Size);  in cell_iommu_enable_hardware()
389 	iommu->cmd_regs = iommu->xlate_regs + IOC_IOCmd_Offset;  in cell_iommu_enable_hardware()
394 	/* setup interrupts for the iommu. */  in cell_iommu_enable_hardware()
395 	reg = in_be64(iommu->xlate_regs + IOC_IO_ExcpStat);  in cell_iommu_enable_hardware()
396 	out_be64(iommu->xlate_regs + IOC_IO_ExcpStat,  in cell_iommu_enable_hardware()
398 	out_be64(iommu->xlate_regs + IOC_IO_ExcpMask,  in cell_iommu_enable_hardware()
402 			IIC_IRQ_IOEX_ATI | (iommu->nid << IIC_IRQ_NODE_SHIFT));  in cell_iommu_enable_hardware()
405 	ret = request_irq(virq, ioc_interrupt, 0, iommu->name, iommu);  in cell_iommu_enable_hardware()
408 	/* set the IOC segment table origin register (and turn on the iommu) */  in cell_iommu_enable_hardware()
409 	reg = IOC_IOST_Origin_E | __pa(iommu->stab) | IOC_IOST_Origin_HW;  in cell_iommu_enable_hardware()
410 	out_be64(iommu->xlate_regs + IOC_IOST_Origin, reg);  in cell_iommu_enable_hardware()
411 	in_be64(iommu->xlate_regs + IOC_IOST_Origin);  in cell_iommu_enable_hardware()
414 	reg = in_be64(iommu->cmd_regs + IOC_IOCmd_Cfg) | IOC_IOCmd_Cfg_TE;  in cell_iommu_enable_hardware()
415 	out_be64(iommu->cmd_regs + IOC_IOCmd_Cfg, reg);  in cell_iommu_enable_hardware()
418 static void __init cell_iommu_setup_hardware(struct cbe_iommu *iommu,  in cell_iommu_setup_hardware()  argument
421 	cell_iommu_setup_stab(iommu, base, size, 0, 0);  in cell_iommu_setup_hardware()
422 	iommu->ptab = cell_iommu_alloc_ptab(iommu, base, size, 0, 0,  in cell_iommu_setup_hardware()
424 	cell_iommu_enable_hardware(iommu);  in cell_iommu_setup_hardware()
428 static struct iommu_window *find_window(struct cbe_iommu *iommu,
435 	list_for_each_entry(window, &(iommu->windows), list) {
450 		printk(KERN_WARNING "iommu: missing ioid for %pOF using 0\n",  in cell_iommu_get_ioid()
464 cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,  in cell_iommu_setup_window()  argument
474 	window = kzalloc_node(sizeof(*window), GFP_KERNEL, iommu->nid);  in cell_iommu_setup_window()
480 	window->iommu = iommu;  in cell_iommu_setup_window()
483 	window->table.it_base = (unsigned long)iommu->ptab;  in cell_iommu_setup_window()
484 	window->table.it_index = iommu->nid;  in cell_iommu_setup_window()
491 	if (!iommu_init_table(&window->table, iommu->nid, 0, 0))  in cell_iommu_setup_window()
492 		panic("Failed to initialize iommu table");  in cell_iommu_setup_window()
500 	list_add(&window->list, &iommu->windows);  in cell_iommu_setup_window()
505 	/* We need to map and reserve the first IOMMU page since it's used  in cell_iommu_setup_window()
512 	page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);  in cell_iommu_setup_window()
514 	iommu->pad_page = page_address(page);  in cell_iommu_setup_window()
515 	clear_page(iommu->pad_page);  in cell_iommu_setup_window()
519 		       (unsigned long)iommu->pad_page, DMA_TO_DEVICE, 0);  in cell_iommu_setup_window()
545 	struct cbe_iommu *iommu;  in cell_get_iommu_table()  local
548 	 * node's iommu. We -might- do something smarter later though it may  in cell_get_iommu_table()
551 	iommu = cell_iommu_for_node(dev_to_node(dev));  in cell_get_iommu_table()
552 	if (iommu == NULL || list_empty(&iommu->windows)) {  in cell_get_iommu_table()
553 		dev_err(dev, "iommu: missing iommu for %pOF (node %d)\n",  in cell_get_iommu_table()
557 	window = list_entry(iommu->windows.next, struct iommu_window, list);  in cell_get_iommu_table()
622 	struct cbe_iommu *iommu;  in cell_iommu_alloc()  local
628 		printk(KERN_ERR "iommu: failed to get node for %pOF\n",  in cell_iommu_alloc()
632 	pr_debug("iommu: setting up iommu for node %d (%pOF)\n",  in cell_iommu_alloc()
635 	/* XXX todo: If we can have multiple windows on the same IOMMU, which  in cell_iommu_alloc()
637 	 * iommu for that node is already setup.  in cell_iommu_alloc()
640 	 * multiple window support since the cell iommu supports per-page ioids  in cell_iommu_alloc()
644 		printk(KERN_ERR "iommu: too many IOMMUs detected ! (%pOF)\n",  in cell_iommu_alloc()
651 	iommu = &iommus[i];  in cell_iommu_alloc()
652 	iommu->stab = NULL;  in cell_iommu_alloc()
653 	iommu->nid = nid;  in cell_iommu_alloc()
654 	snprintf(iommu->name, sizeof(iommu->name), "iommu%d", i);  in cell_iommu_alloc()
655 	INIT_LIST_HEAD(&iommu->windows);  in cell_iommu_alloc()
657 	return iommu;  in cell_iommu_alloc()
663 	struct cbe_iommu *iommu;  in cell_iommu_init_one()  local
666 	iommu = cell_iommu_alloc(np);  in cell_iommu_init_one()
667 	if (!iommu)  in cell_iommu_init_one()
677 	cell_iommu_setup_hardware(iommu, base, size);  in cell_iommu_init_one()
680 	cell_iommu_setup_window(iommu, np, base, size,  in cell_iommu_init_one()
699 		pr_debug("iommu: cleaning up iommu on node %d\n", node);  in cell_disable_iommus()
717 	/* When no iommu is present, we use direct DMA ops */  in cell_iommu_init_disabled()
751 	 * all of physical memory. If not, we force enable IOMMU  in cell_iommu_init_disabled()
754 		printk(KERN_WARNING "iommu: force-enabled, dma window"  in cell_iommu_init_disabled()
765 	printk("iommu: disabled, direct DMA offset is 0x%lx\n",  in cell_iommu_init_disabled()
772  *  Fixed IOMMU mapping support
774  *  This code adds support for setting up a fixed IOMMU mapping on certain
781  *  we setup the fixed mapping immediately above the normal IOMMU window.
784  *  IOMMU window from 0-2GB and the fixed mapping window from 2GB to 6GB. In
790  *  mapping above the normal IOMMU window as we would run out of address space.
791  *  Instead we move the normal IOMMU window to coincide with the hash page
824 		dev_dbg(dev, "iommu: no dma-ranges found\n");  in cell_iommu_get_fixed_address()
851 		dev_dbg(dev, "iommu: no suitable range found!\n");  in cell_iommu_get_fixed_address()
874 	pr_debug("iommu: addr %lx ptab %p segment %lx offset %lx\n",  in insert_16M_pte()
880 static void __init cell_iommu_setup_fixed_ptab(struct cbe_iommu *iommu,  in cell_iommu_setup_fixed_ptab()  argument
886 	ptab = cell_iommu_alloc_ptab(iommu, fbase, fsize, dbase, dsize, 24);  in cell_iommu_setup_fixed_ptab()
890 	pr_debug("iommu: mapping 0x%lx pages from 0x%lx\n", fsize, fbase);  in cell_iommu_setup_fixed_ptab()
896 		pr_info("IOMMU: Using weak ordering for fixed mapping\n");  in cell_iommu_setup_fixed_ptab()
898 		pr_info("IOMMU: Using strong ordering for fixed mapping\n");  in cell_iommu_setup_fixed_ptab()
906 			pr_debug("iommu: fixed/dynamic overlap, skipping\n");  in cell_iommu_setup_fixed_ptab()
919 	struct cbe_iommu *iommu;  in cell_iommu_fixed_mapping_init()  local
927 		pr_debug("iommu: fixed mapping disabled, no axons found\n");  in cell_iommu_fixed_mapping_init()
936 		pr_debug("iommu: no dma-ranges found, no fixed mapping\n");  in cell_iommu_fixed_mapping_init()
941 	 * dynamic region, so find the top of the largest IOMMU window  in cell_iommu_fixed_mapping_init()
964 			pr_debug("iommu: htab is NULL, on LPAR? Huh?\n");  in cell_iommu_fixed_mapping_init()
973 			pr_debug("iommu: hash window not segment aligned\n");  in cell_iommu_fixed_mapping_init()
982 				pr_debug("iommu: hash window doesn't fit in"  in cell_iommu_fixed_mapping_init()
994 		iommu = cell_iommu_alloc(np);  in cell_iommu_fixed_mapping_init()
995 		BUG_ON(!iommu);  in cell_iommu_fixed_mapping_init()
1004 		printk(KERN_DEBUG "iommu: node %d, dynamic window 0x%lx-0x%lx "  in cell_iommu_fixed_mapping_init()
1005 			"fixed window 0x%lx-0x%lx\n", iommu->nid, dbase,  in cell_iommu_fixed_mapping_init()
1008 		cell_iommu_setup_stab(iommu, dbase, dsize, fbase, fsize);  in cell_iommu_fixed_mapping_init()
1009 		iommu->ptab = cell_iommu_alloc_ptab(iommu, dbase, dsize, 0, 0,  in cell_iommu_fixed_mapping_init()
1011 		cell_iommu_setup_fixed_ptab(iommu, np, dbase, dsize,  in cell_iommu_fixed_mapping_init()
1013 		cell_iommu_enable_hardware(iommu);  in cell_iommu_fixed_mapping_init()
1014 		cell_iommu_setup_window(iommu, np, dbase, dsize, 0);  in cell_iommu_fixed_mapping_init()
1051 	/* If IOMMU is disabled or we have little enough RAM to not need  in cell_iommu_init()
1054 	 * Note: should we make sure we have the IOMMU actually disabled ?  in cell_iommu_init()
1067 	/* Create an iommu for each /axon node.  */  in cell_iommu_init()
1074 	/* Create an iommu for each toplevel /pci-internal node for  in cell_iommu_init()
1083 	/* Setup default PCI iommu ops */  in cell_iommu_init()