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-rw-r--r--arch/ppc64/kernel/iSeries_iommu.c175
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diff --git a/arch/ppc64/kernel/iSeries_iommu.c b/arch/ppc64/kernel/iSeries_iommu.c
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1/*
2 * arch/ppc64/kernel/iSeries_iommu.c
3 *
4 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
5 *
6 * Rewrite, cleanup:
7 *
8 * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
9 *
10 * Dynamic DMA mapping support, iSeries-specific parts.
11 *
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 */
27
28#include <linux/types.h>
29#include <linux/dma-mapping.h>
30#include <linux/list.h>
31
32#include <asm/iommu.h>
33#include <asm/machdep.h>
34#include <asm/iSeries/HvCallXm.h>
35#include <asm/iSeries/iSeries_pci.h>
36
37extern struct list_head iSeries_Global_Device_List;
38
39
40static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
41 unsigned long uaddr, enum dma_data_direction direction)
42{
43 u64 rc;
44 union tce_entry tce;
45
46 while (npages--) {
47 tce.te_word = 0;
48 tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> PAGE_SHIFT;
49
50 if (tbl->it_type == TCE_VB) {
51 /* Virtual Bus */
52 tce.te_bits.tb_valid = 1;
53 tce.te_bits.tb_allio = 1;
54 if (direction != DMA_TO_DEVICE)
55 tce.te_bits.tb_rdwr = 1;
56 } else {
57 /* PCI Bus */
58 tce.te_bits.tb_rdwr = 1; /* Read allowed */
59 if (direction != DMA_TO_DEVICE)
60 tce.te_bits.tb_pciwr = 1;
61 }
62
63 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index,
64 tce.te_word);
65 if (rc)
66 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
67 rc);
68 index++;
69 uaddr += PAGE_SIZE;
70 }
71}
72
73static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
74{
75 u64 rc;
76
77 while (npages--) {
78 rc = HvCallXm_setTce((u64)tbl->it_index, (u64)index, 0);
79 if (rc)
80 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n",
81 rc);
82 index++;
83 }
84}
85
86
87/*
88 * This function compares the known tables to find an iommu_table
89 * that has already been built for hardware TCEs.
90 */
91static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
92{
93 struct iSeries_Device_Node *dp;
94
95 list_for_each_entry(dp, &iSeries_Global_Device_List, Device_List) {
96 if ((dp->iommu_table != NULL) &&
97 (dp->iommu_table->it_type == TCE_PCI) &&
98 (dp->iommu_table->it_offset == tbl->it_offset) &&
99 (dp->iommu_table->it_index == tbl->it_index) &&
100 (dp->iommu_table->it_size == tbl->it_size))
101 return dp->iommu_table;
102 }
103 return NULL;
104}
105
106/*
107 * Call Hv with the architected data structure to get TCE table info.
108 * info. Put the returned data into the Linux representation of the
109 * TCE table data.
110 * The Hardware Tce table comes in three flavors.
111 * 1. TCE table shared between Buses.
112 * 2. TCE table per Bus.
113 * 3. TCE Table per IOA.
114 */
115static void iommu_table_getparms(struct iSeries_Device_Node* dn,
116 struct iommu_table* tbl)
117{
118 struct iommu_table_cb *parms;
119
120 parms = kmalloc(sizeof(*parms), GFP_KERNEL);
121 if (parms == NULL)
122 panic("PCI_DMA: TCE Table Allocation failed.");
123
124 memset(parms, 0, sizeof(*parms));
125
126 parms->itc_busno = ISERIES_BUS(dn);
127 parms->itc_slotno = dn->LogicalSlot;
128 parms->itc_virtbus = 0;
129
130 HvCallXm_getTceTableParms(ISERIES_HV_ADDR(parms));
131
132 if (parms->itc_size == 0)
133 panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
134
135 /* itc_size is in pages worth of table, it_size is in # of entries */
136 tbl->it_size = (parms->itc_size * PAGE_SIZE) / sizeof(union tce_entry);
137 tbl->it_busno = parms->itc_busno;
138 tbl->it_offset = parms->itc_offset;
139 tbl->it_index = parms->itc_index;
140 tbl->it_blocksize = 1;
141 tbl->it_type = TCE_PCI;
142
143 kfree(parms);
144}
145
146
147void iommu_devnode_init_iSeries(struct iSeries_Device_Node *dn)
148{
149 struct iommu_table *tbl;
150
151 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
152
153 iommu_table_getparms(dn, tbl);
154
155 /* Look for existing tce table */
156 dn->iommu_table = iommu_table_find(tbl);
157 if (dn->iommu_table == NULL)
158 dn->iommu_table = iommu_init_table(tbl);
159 else
160 kfree(tbl);
161}
162
163static void iommu_dev_setup_iSeries(struct pci_dev *dev) { }
164static void iommu_bus_setup_iSeries(struct pci_bus *bus) { }
165
166void iommu_init_early_iSeries(void)
167{
168 ppc_md.tce_build = tce_build_iSeries;
169 ppc_md.tce_free = tce_free_iSeries;
170
171 ppc_md.iommu_dev_setup = iommu_dev_setup_iSeries;
172 ppc_md.iommu_bus_setup = iommu_bus_setup_iSeries;
173
174 pci_iommu_init();
175}