[net-next-2.6.git] / arch / powerpc / platforms / iseries / iommu.c

/*
 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
 *
 * Rewrite, cleanup:
 *
 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
 * Copyright (C) 2006 Olof Johansson <olof@lixom.net>
 *
 * Dynamic DMA mapping support, iSeries-specific parts.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <asm/iommu.h>
#include <asm/vio.h>
#include <asm/tce.h>
#include <asm/machdep.h>
#include <asm/abs_addr.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/iseries/hv_call_event.h>
#include <asm/iseries/iommu.h>

static int tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
		unsigned long uaddr, enum dma_data_direction direction,
		struct dma_attrs *attrs)
{
	u64 rc;
	u64 tce, rpn;

	while (npages--) {
		rpn = virt_to_abs(uaddr) >> TCE_SHIFT;
		tce = (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;

		if (tbl->it_type == TCE_VB) {
			/* Virtual Bus */
			tce |= TCE_VALID|TCE_ALLIO;
			if (direction != DMA_TO_DEVICE)
				tce |= TCE_VB_WRITE;
		} else {
			/* PCI Bus */
			tce |= TCE_PCI_READ; /* Read allowed */
			if (direction != DMA_TO_DEVICE)
				tce |= TCE_PCI_WRITE;
		}

		rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, tce);
		if (rc)
			panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%llx\n",
					rc);
		index++;
		uaddr += TCE_PAGE_SIZE;
	}
	return 0;
}

static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
{
	u64 rc;

	while (npages--) {
		rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
		if (rc)
			panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%llx\n",
					rc);
		index++;
	}
}

/*
 * Structure passed to HvCallXm_getTceTableParms
 */
struct iommu_table_cb {
	unsigned long	itc_busno;	/* Bus number for this tce table */
	unsigned long	itc_start;	/* Will be NULL for secondary */
	unsigned long	itc_totalsize;	/* Size (in pages) of whole table */
	unsigned long	itc_offset;	/* Index into real tce table of the
					   start of our section */
	unsigned long	itc_size;	/* Size (in pages) of our section */
	unsigned long	itc_index;	/* Index of this tce table */
	unsigned short	itc_maxtables;	/* Max num of tables for partition */
	unsigned char	itc_virtbus;	/* Flag to indicate virtual bus */
	unsigned char	itc_slotno;	/* IOA Tce Slot Index */
	unsigned char	itc_rsvd[4];
};

/*
 * Call Hv with the architected data structure to get TCE table info.
 * info. Put the returned data into the Linux representation of the
 * TCE table data.
 * The Hardware Tce table comes in three flavors.
 * 1. TCE table shared between Buses.
 * 2. TCE table per Bus.
 * 3. TCE Table per IOA.
 */
void iommu_table_getparms_iSeries(unsigned long busno,
				  unsigned char slotno,
				  unsigned char virtbus,
				  struct iommu_table* tbl)
{
	struct iommu_table_cb *parms;

	parms = kzalloc(sizeof(*parms), GFP_KERNEL);
	if (parms == NULL)
		panic("PCI_DMA: TCE Table Allocation failed.");

	parms->itc_busno = busno;
	parms->itc_slotno = slotno;
	parms->itc_virtbus = virtbus;

	HvCallXm_getTceTableParms(iseries_hv_addr(parms));

	if (parms->itc_size == 0)
		panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);

	/* itc_size is in pages worth of table, it_size is in # of entries */
	tbl->it_size = (parms->itc_size * TCE_PAGE_SIZE) / TCE_ENTRY_SIZE;
	tbl->it_busno = parms->itc_busno;
	tbl->it_offset = parms->itc_offset;
	tbl->it_index = parms->itc_index;
	tbl->it_blocksize = 1;
	tbl->it_type = virtbus ? TCE_VB : TCE_PCI;

	kfree(parms);
}


#ifdef CONFIG_PCI
/*
 * This function compares the known tables to find an iommu_table
 * that has already been built for hardware TCEs.
 */
static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
{
	struct device_node *node;

	for (node = NULL; (node = of_find_all_nodes(node)); ) {
		struct pci_dn *pdn = PCI_DN(node);
		struct iommu_table *it;

		if (pdn == NULL)
			continue;
		it = pdn->iommu_table;
		if ((it != NULL) &&
		    (it->it_type == TCE_PCI) &&
		    (it->it_offset == tbl->it_offset) &&
		    (it->it_index == tbl->it_index) &&
		    (it->it_size == tbl->it_size)) {
			of_node_put(node);
			return it;
		}
	}
	return NULL;
}


static void pci_dma_dev_setup_iseries(struct pci_dev *pdev)
{
	struct iommu_table *tbl;
	struct device_node *dn = pci_device_to_OF_node(pdev);
	struct pci_dn *pdn = PCI_DN(dn);
	const u32 *lsn = of_get_property(dn, "linux,logical-slot-number", NULL);

	BUG_ON(lsn == NULL);

	tbl = kzalloc(sizeof(struct iommu_table), GFP_KERNEL);

	iommu_table_getparms_iSeries(pdn->busno, *lsn, 0, tbl);

	/* Look for existing tce table */
	pdn->iommu_table = iommu_table_find(tbl);
	if (pdn->iommu_table == NULL)
		pdn->iommu_table = iommu_init_table(tbl, -1);
	else
		kfree(tbl);
	set_iommu_table_base(&pdev->dev, pdn->iommu_table);
}
#else
#define pci_dma_dev_setup_iseries	NULL
#endif

static struct iommu_table veth_iommu_table;
static struct iommu_table vio_iommu_table;

void *iseries_hv_alloc(size_t size, dma_addr_t *dma_handle, gfp_t flag)
{
	return iommu_alloc_coherent(NULL, &vio_iommu_table, size, dma_handle,
				DMA_BIT_MASK(32), flag, -1);
}
EXPORT_SYMBOL_GPL(iseries_hv_alloc);

void iseries_hv_free(size_t size, void *vaddr, dma_addr_t dma_handle)
{
	iommu_free_coherent(&vio_iommu_table, size, vaddr, dma_handle);
}
EXPORT_SYMBOL_GPL(iseries_hv_free);

dma_addr_t iseries_hv_map(void *vaddr, size_t size,
			enum dma_data_direction direction)
{
	return iommu_map_page(NULL, &vio_iommu_table, virt_to_page(vaddr),
			      (unsigned long)vaddr % PAGE_SIZE, size,
			      DMA_BIT_MASK(32), direction, NULL);
}

void iseries_hv_unmap(dma_addr_t dma_handle, size_t size,
			enum dma_data_direction direction)
{
	iommu_unmap_page(&vio_iommu_table, dma_handle, size, direction, NULL);
}

void __init iommu_vio_init(void)
{
	iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
	veth_iommu_table.it_size /= 2;
	vio_iommu_table = veth_iommu_table;
	vio_iommu_table.it_offset += veth_iommu_table.it_size;

	if (!iommu_init_table(&veth_iommu_table, -1))
		printk("Virtual Bus VETH TCE table failed.\n");
	if (!iommu_init_table(&vio_iommu_table, -1))
		printk("Virtual Bus VIO TCE table failed.\n");
}

struct iommu_table *vio_build_iommu_table_iseries(struct vio_dev *dev)
{
	if (strcmp(dev->type, "network") == 0)
		return &veth_iommu_table;
	return &vio_iommu_table;
}

void iommu_init_early_iSeries(void)
{
	ppc_md.tce_build = tce_build_iSeries;
	ppc_md.tce_free  = tce_free_iSeries;

	ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_iseries;
	set_pci_dma_ops(&dma_iommu_ops);
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
	3	*
	4	* Rewrite, cleanup:
	5	*
91f14480	6	* Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
bc97ce95	7	* Copyright (C) 2006 Olof Johansson <olof@lixom.net>
1da177e4 LT	8	*
	9	* Dynamic DMA mapping support, iSeries-specific parts.
	10	*
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	25	*/
	26
	27	#include <linux/types.h>
	28	#include <linux/dma-mapping.h>
	29	#include <linux/list.h>
12d04eef	30	#include <linux/pci.h>
1670b2b2	31	#include <linux/module.h>
5a0e3ad6	32	#include <linux/slab.h>
1da177e4 LT	33
1da177e4 LT	34	#include <asm/iommu.h>
dd9b67ab	35	#include <asm/vio.h>
c707ffcf	36	#include <asm/tce.h>
1da177e4	37	#include <asm/machdep.h>
426c1a11	38	#include <asm/abs_addr.h>
96ff6afa	39	#include <asm/prom.h>
bffa8fc3	40	#include <asm/pci-bridge.h>
8021b8a7	41	#include <asm/iseries/hv_call_xm.h>
1670b2b2	42	#include <asm/iseries/hv_call_event.h>
c7f0e8cb	43	#include <asm/iseries/iommu.h>
9bd7ea60	44
6490c490	45	static int tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
4f3dd8a0 MN	46	unsigned long uaddr, enum dma_data_direction direction,
4f3dd8a0 MN	47	struct dma_attrs *attrs)
1da177e4 LT	48	{
1da177e4 LT	49	u64 rc;
bc97ce95	50	u64 tce, rpn;
1da177e4 LT	51
1da177e4 LT	52	while (npages--) {
bc97ce95 OJ	53	rpn = virt_to_abs(uaddr) >> TCE_SHIFT;
bc97ce95 OJ	54	tce = (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
1da177e4 LT	55
	56	if (tbl->it_type == TCE_VB) {
	57	/* Virtual Bus */
bc97ce95	58	tce \|= TCE_VALID\|TCE_ALLIO;
1da177e4	59	if (direction != DMA_TO_DEVICE)
bc97ce95	60	tce \|= TCE_VB_WRITE;
1da177e4 LT	61	} else {
1da177e4 LT	62	/* PCI Bus */
bc97ce95	63	tce \|= TCE_PCI_READ; /* Read allowed */
1da177e4	64	if (direction != DMA_TO_DEVICE)
bc97ce95	65	tce \|= TCE_PCI_WRITE;
1da177e4 LT	66	}
1da177e4 LT	67
bc97ce95	68	rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, tce);
1da177e4	69	if (rc)
fe333321	70	panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%llx\n",
1da177e4 LT	71	rc);
1da177e4 LT	72	index++;
3c726f8d	73	uaddr += TCE_PAGE_SIZE;
1da177e4	74	}
6490c490	75	return 0;
1da177e4 LT	76	}
	77
	78	static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
	79	{
	80	u64 rc;
	81
	82	while (npages--) {
	83	rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
	84	if (rc)
fe333321	85	panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%llx\n",
1da177e4 LT	86	rc);
	87	index++;
	88	}
	89	}
	90
ca652c93 ME	91	/*
	92	* Structure passed to HvCallXm_getTceTableParms
	93	*/
	94	struct iommu_table_cb {
	95	unsigned long itc_busno; /* Bus number for this tce table */
	96	unsigned long itc_start; /* Will be NULL for secondary */
	97	unsigned long itc_totalsize; /* Size (in pages) of whole table */
	98	unsigned long itc_offset; /* Index into real tce table of the
	99	start of our section */
	100	unsigned long itc_size; /* Size (in pages) of our section */
	101	unsigned long itc_index; /* Index of this tce table */
	102	unsigned short itc_maxtables; /* Max num of tables for partition */
	103	unsigned char itc_virtbus; /* Flag to indicate virtual bus */
	104	unsigned char itc_slotno; /* IOA Tce Slot Index */
	105	unsigned char itc_rsvd[4];
	106	};
	107
1da177e4 LT	108	/*
	109	* Call Hv with the architected data structure to get TCE table info.
	110	* info. Put the returned data into the Linux representation of the
	111	* TCE table data.
	112	* The Hardware Tce table comes in three flavors.
	113	* 1. TCE table shared between Buses.
	114	* 2. TCE table per Bus.
	115	* 3. TCE Table per IOA.
	116	*/
3c726f8d BH	117	void iommu_table_getparms_iSeries(unsigned long busno,
	118	unsigned char slotno,
	119	unsigned char virtbus,
	120	struct iommu_table* tbl)
1da177e4 LT	121	{
	122	struct iommu_table_cb *parms;
	123
f8485350	124	parms = kzalloc(sizeof(*parms), GFP_KERNEL);
1da177e4 LT	125	if (parms == NULL)
	126	panic("PCI_DMA: TCE Table Allocation failed.");
	127
3c726f8d BH	128	parms->itc_busno = busno;
	129	parms->itc_slotno = slotno;
	130	parms->itc_virtbus = virtbus;
1da177e4	131
426c1a11	132	HvCallXm_getTceTableParms(iseries_hv_addr(parms));
1da177e4 LT	133
	134	if (parms->itc_size == 0)
	135	panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
	136
	137	/* itc_size is in pages worth of table, it_size is in # of entries */
5d2efba6	138	tbl->it_size = (parms->itc_size * TCE_PAGE_SIZE) / TCE_ENTRY_SIZE;
1da177e4	139	tbl->it_busno = parms->itc_busno;
5d2efba6	140	tbl->it_offset = parms->itc_offset;
1da177e4 LT	141	tbl->it_index = parms->itc_index;
1da177e4 LT	142	tbl->it_blocksize = 1;
3c726f8d	143	tbl->it_type = virtbus ? TCE_VB : TCE_PCI;
1da177e4 LT	144
	145	kfree(parms);
	146	}
	147
	148
3c726f8d BH	149	#ifdef CONFIG_PCI
	150	/*
	151	* This function compares the known tables to find an iommu_table
	152	* that has already been built for hardware TCEs.
	153	*/
	154	static struct iommu_table iommu_table_find(struct iommu_table tbl)
	155	{
96ff6afa SR	156	struct device_node *node;
	157
	158	for (node = NULL; (node = of_find_all_nodes(node)); ) {
	159	struct pci_dn *pdn = PCI_DN(node);
	160	struct iommu_table *it;
3c726f8d	161
96ff6afa SR	162	if (pdn == NULL)
	163	continue;
	164	it = pdn->iommu_table;
3c726f8d BH	165	if ((it != NULL) &&
	166	(it->it_type == TCE_PCI) &&
	167	(it->it_offset == tbl->it_offset) &&
	168	(it->it_index == tbl->it_index) &&
af449c33 JL	169	(it->it_size == tbl->it_size)) {
af449c33 JL	170	of_node_put(node);
3c726f8d	171	return it;
af449c33	172	}
3c726f8d BH	173	}
	174	return NULL;
	175	}
	176
	177
397717c5	178	static void pci_dma_dev_setup_iseries(struct pci_dev *pdev)
1da177e4 LT	179	{
1da177e4 LT	180	struct iommu_table *tbl;
d7b41b1f	181	struct device_node *dn = pci_device_to_OF_node(pdev);
252e75a5	182	struct pci_dn *pdn = PCI_DN(dn);
e2eb6392	183	const u32 *lsn = of_get_property(dn, "linux,logical-slot-number", NULL);
403fac4f SR	184
403fac4f SR	185	BUG_ON(lsn == NULL);
1da177e4	186
7aa241fd	187	tbl = kzalloc(sizeof(struct iommu_table), GFP_KERNEL);
1da177e4	188
403fac4f	189	iommu_table_getparms_iSeries(pdn->busno, *lsn, 0, tbl);
1da177e4 LT	190
1da177e4 LT	191	/* Look for existing tce table */
252e75a5 SR	192	pdn->iommu_table = iommu_table_find(tbl);
252e75a5 SR	193	if (pdn->iommu_table == NULL)
ca1588e7	194	pdn->iommu_table = iommu_init_table(tbl, -1);
1da177e4 LT	195	else
1da177e4 LT	196	kfree(tbl);
738ef42e	197	set_iommu_table_base(&pdev->dev, pdn->iommu_table);
1da177e4	198	}
397717c5 SR	199	#else
397717c5 SR	200	#define pci_dma_dev_setup_iseries NULL
145d01e4	201	#endif
1da177e4	202
dd9b67ab SR	203	static struct iommu_table veth_iommu_table;
dd9b67ab SR	204	static struct iommu_table vio_iommu_table;
1670b2b2 SR	205
	206	void iseries_hv_alloc(size_t size, dma_addr_t dma_handle, gfp_t flag)
	207	{
fb3475e9	208	return iommu_alloc_coherent(NULL, &vio_iommu_table, size, dma_handle,
284901a9	209	DMA_BIT_MASK(32), flag, -1);
1670b2b2 SR	210	}
	211	EXPORT_SYMBOL_GPL(iseries_hv_alloc);
	212
	213	void iseries_hv_free(size_t size, void *vaddr, dma_addr_t dma_handle)
	214	{
	215	iommu_free_coherent(&vio_iommu_table, size, vaddr, dma_handle);
	216	}
	217	EXPORT_SYMBOL_GPL(iseries_hv_free);
	218
	219	dma_addr_t iseries_hv_map(void *vaddr, size_t size,
	220	enum dma_data_direction direction)
	221	{
f9226d57 MN	222	return iommu_map_page(NULL, &vio_iommu_table, virt_to_page(vaddr),
f9226d57 MN	223	(unsigned long)vaddr % PAGE_SIZE, size,
284901a9	224	DMA_BIT_MASK(32), direction, NULL);
1670b2b2 SR	225	}
	226
	227	void iseries_hv_unmap(dma_addr_t dma_handle, size_t size,
	228	enum dma_data_direction direction)
	229	{
f9226d57	230	iommu_unmap_page(&vio_iommu_table, dma_handle, size, direction, NULL);
1670b2b2 SR	231	}
1670b2b2 SR	232
dd9b67ab SR	233	void __init iommu_vio_init(void)
	234	{
	235	iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
	236	veth_iommu_table.it_size /= 2;
	237	vio_iommu_table = veth_iommu_table;
	238	vio_iommu_table.it_offset += veth_iommu_table.it_size;
	239
	240	if (!iommu_init_table(&veth_iommu_table, -1))
	241	printk("Virtual Bus VETH TCE table failed.\n");
	242	if (!iommu_init_table(&vio_iommu_table, -1))
	243	printk("Virtual Bus VIO TCE table failed.\n");
	244	}
	245
	246	struct iommu_table vio_build_iommu_table_iseries(struct vio_dev dev)
	247	{
	248	if (strcmp(dev->type, "network") == 0)
	249	return &veth_iommu_table;
	250	return &vio_iommu_table;
	251	}
	252
1da177e4 LT	253	void iommu_init_early_iSeries(void)
	254	{
	255	ppc_md.tce_build = tce_build_iSeries;
	256	ppc_md.tce_free = tce_free_iSeries;
	257
397717c5	258	ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_iseries;
98747770	259	set_pci_dma_ops(&dma_iommu_ops);
1da177e4	260	}