2 * arch/ppc64/kernel/iSeries_iommu.c
4 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
8 * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
10 * Dynamic DMA mapping support, iSeries-specific parts.
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.
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.
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
28 #include <linux/config.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/slab.h>
33 #include <linux/spinlock.h>
34 #include <linux/string.h>
35 #include <linux/pci.h>
36 #include <linux/dma-mapping.h>
40 #include <asm/ppcdebug.h>
42 #include <asm/iSeries/HvCallXm.h>
43 #include <asm/iSeries/LparData.h>
44 #include <asm/iommu.h>
45 #include <asm/pci-bridge.h>
46 #include <asm/iSeries/iSeries_pci.h>
48 #include <asm/machdep.h>
53 extern struct list_head iSeries_Global_Device_List;
56 static void tce_build_iSeries(struct iommu_table *tbl, long index, long npages,
57 unsigned long uaddr, enum dma_data_direction direction)
64 tce.te_bits.tb_rpn = virt_to_abs(uaddr) >> PAGE_SHIFT;
66 if (tbl->it_type == TCE_VB) {
68 tce.te_bits.tb_valid = 1;
69 tce.te_bits.tb_allio = 1;
70 if (direction != DMA_TO_DEVICE)
71 tce.te_bits.tb_rdwr = 1;
74 tce.te_bits.tb_rdwr = 1; /* Read allowed */
75 if (direction != DMA_TO_DEVICE)
76 tce.te_bits.tb_pciwr = 1;
79 rc = HvCallXm_setTce((u64)tbl->it_index,
83 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n", rc);
90 static void tce_free_iSeries(struct iommu_table *tbl, long index, long npages)
97 rc = HvCallXm_setTce((u64)tbl->it_index,
102 panic("PCI_DMA: HvCallXm_setTce failed, Rc: 0x%lx\n", rc);
111 * This function compares the known tables to find an iommu_table
112 * that has already been built for hardware TCEs.
114 static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
116 struct iSeries_Device_Node *dp;
118 for (dp = (struct iSeries_Device_Node *)iSeries_Global_Device_List.next;
119 dp != (struct iSeries_Device_Node *)&iSeries_Global_Device_List;
120 dp = (struct iSeries_Device_Node *)dp->Device_List.next)
121 if (dp->iommu_table != NULL &&
122 dp->iommu_table->it_type == TCE_PCI &&
123 dp->iommu_table->it_offset == tbl->it_offset &&
124 dp->iommu_table->it_index == tbl->it_index &&
125 dp->iommu_table->it_size == tbl->it_size)
126 return dp->iommu_table;
133 * Call Hv with the architected data structure to get TCE table info.
134 * info. Put the returned data into the Linux representation of the
136 * The Hardware Tce table comes in three flavors.
137 * 1. TCE table shared between Buses.
138 * 2. TCE table per Bus.
139 * 3. TCE Table per IOA.
141 static void iommu_table_getparms(struct iSeries_Device_Node* dn,
142 struct iommu_table* tbl)
144 struct iommu_table_cb *parms;
146 parms = (struct iommu_table_cb*)kmalloc(sizeof(*parms), GFP_KERNEL);
149 panic("PCI_DMA: TCE Table Allocation failed.");
151 memset(parms, 0, sizeof(*parms));
153 parms->itc_busno = ISERIES_BUS(dn);
154 parms->itc_slotno = dn->LogicalSlot;
155 parms->itc_virtbus = 0;
157 HvCallXm_getTceTableParms(ISERIES_HV_ADDR(parms));
159 if (parms->itc_size == 0)
160 panic("PCI_DMA: parms->size is zero, parms is 0x%p", parms);
162 tbl->it_size = parms->itc_size;
163 tbl->it_busno = parms->itc_busno;
164 tbl->it_offset = parms->itc_offset;
165 tbl->it_index = parms->itc_index;
166 tbl->it_entrysize = sizeof(union tce_entry);
167 tbl->it_blocksize = 1;
168 tbl->it_type = TCE_PCI;
174 void iommu_devnode_init(struct iSeries_Device_Node *dn) {
175 struct iommu_table *tbl;
177 tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
179 iommu_table_getparms(dn, tbl);
181 /* Look for existing tce table */
182 dn->iommu_table = iommu_table_find(tbl);
184 if (dn->iommu_table == NULL)
185 dn->iommu_table = iommu_init_table(tbl);
193 void tce_init_iSeries(void)
195 ppc_md.tce_build = tce_build_iSeries;
196 ppc_md.tce_free = tce_free_iSeries;