1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
/*
* 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 <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;
}
void iommu_devnode_init_iSeries(struct pci_dev *pdev, struct device_node *dn)
{
struct iommu_table *tbl;
struct pci_dn *pdn = PCI_DN(dn);
const u32 *lsn = of_get_property(dn, "linux,logical-slot-number", NULL);
BUG_ON(lsn == NULL);
tbl = kmalloc(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);
pdev->dev.archdata.dma_data = pdn->iommu_table;
}
#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_32BIT_MASK, 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_32BIT_MASK, 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;
set_pci_dma_ops(&dma_iommu_ops);
}
|
