tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2006 Silicon Graphics, Inc. All Rights Reserved.
7 */
8
9#include <linux/types.h>
10#include <linux/pci.h>
11#include <linux/cpumask.h>
12
13#include <asm/sn/addrs.h>
14#include <asm/sn/intr.h>
15#include <asm/sn/pcibus_provider_defs.h>
16#include <asm/sn/pcidev.h>
17#include <asm/sn/nodepda.h>
18
19#include "msi.h"
20
21struct sn_msi_info {
22 u64 pci_addr;
23 struct sn_irq_info *sn_irq_info;
24};
25
26static struct sn_msi_info *sn_msi_info;
27
28static void
29sn_msi_teardown(unsigned int vector)
30{
31 nasid_t nasid;
32 int widget;
33 struct pci_dev *pdev;
34 struct pcidev_info *sn_pdev;
35 struct sn_irq_info *sn_irq_info;
36 struct pcibus_bussoft *bussoft;
37 struct sn_pcibus_provider *provider;
38
39 sn_irq_info = sn_msi_info[vector].sn_irq_info;
40 if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
41 return;
42
43 sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
44 pdev = sn_pdev->pdi_linux_pcidev;
45 provider = SN_PCIDEV_BUSPROVIDER(pdev);
46
47 (*provider->dma_unmap)(pdev,
48 sn_msi_info[vector].pci_addr,
49 PCI_DMA_FROMDEVICE);
50 sn_msi_info[vector].pci_addr = 0;
51
52 bussoft = SN_PCIDEV_BUSSOFT(pdev);
53 nasid = NASID_GET(bussoft->bs_base);
54 widget = (nasid & 1) ?
55 TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
56 SWIN_WIDGETNUM(bussoft->bs_base);
57
58 sn_intr_free(nasid, widget, sn_irq_info);
59 sn_msi_info[vector].sn_irq_info = NULL;
60
61 return;
62}
63
64int
65sn_msi_setup(struct pci_dev *pdev, unsigned int vector,
66 u32 *addr_hi, u32 *addr_lo, u32 *data)
67{
68 int widget;
69 int status;
70 nasid_t nasid;
71 u64 bus_addr;
72 struct sn_irq_info *sn_irq_info;
73 struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
74 struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
75
76 if (bussoft == NULL)
77 return -EINVAL;
78
79 if (provider == NULL || provider->dma_map_consistent == NULL)
80 return -EINVAL;
81
82 /*
83 * Set up the vector plumbing. Let the prom (via sn_intr_alloc)
84 * decide which cpu to direct this msi at by default.
85 */
86
87 nasid = NASID_GET(bussoft->bs_base);
88 widget = (nasid & 1) ?
89 TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
90 SWIN_WIDGETNUM(bussoft->bs_base);
91
92 sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
93 if (! sn_irq_info)
94 return -ENOMEM;
95
96 status = sn_intr_alloc(nasid, widget, sn_irq_info, vector, -1, -1);
97 if (status) {
98 kfree(sn_irq_info);
99 return -ENOMEM;
100 }
101
102 sn_irq_info->irq_int_bit = -1; /* mark this as an MSI irq */
103 sn_irq_fixup(pdev, sn_irq_info);
104
105 /* Prom probably should fill these in, but doesn't ... */
106 sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
107 sn_irq_info->irq_bridge = (void *)bussoft->bs_base;
108
109 /*
110 * Map the xio address into bus space
111 */
112 bus_addr = (*provider->dma_map_consistent)(pdev,
113 sn_irq_info->irq_xtalkaddr,
114 sizeof(sn_irq_info->irq_xtalkaddr),
115 SN_DMA_MSI|SN_DMA_ADDR_XIO);
116 if (! bus_addr) {
117 sn_intr_free(nasid, widget, sn_irq_info);
118 kfree(sn_irq_info);
119 return -ENOMEM;
120 }
121
122 sn_msi_info[vector].sn_irq_info = sn_irq_info;
123 sn_msi_info[vector].pci_addr = bus_addr;
124
125 *addr_hi = (u32)(bus_addr >> 32);
126 *addr_lo = (u32)(bus_addr & 0x00000000ffffffff);
127
128 /*
129 * In the SN platform, bit 16 is a "send vector" bit which
130 * must be present in order to move the vector through the system.
131 */
132 *data = 0x100 + (unsigned int)vector;
133
134#ifdef CONFIG_SMP
135 set_irq_affinity_info((vector & 0xff), sn_irq_info->irq_cpuid, 0);
136#endif
137
138 return 0;
139}
140
141static void
142sn_msi_target(unsigned int vector, unsigned int cpu,
143 u32 *addr_hi, u32 *addr_lo)
144{
145 int slice;
146 nasid_t nasid;
147 u64 bus_addr;
148 struct pci_dev *pdev;
149 struct pcidev_info *sn_pdev;
150 struct sn_irq_info *sn_irq_info;
151 struct sn_irq_info *new_irq_info;
152 struct sn_pcibus_provider *provider;
153
154 sn_irq_info = sn_msi_info[vector].sn_irq_info;
155 if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
156 return;
157
158 /*
159 * Release XIO resources for the old MSI PCI address
160 */
161
162 sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
163 pdev = sn_pdev->pdi_linux_pcidev;
164 provider = SN_PCIDEV_BUSPROVIDER(pdev);
165
166 bus_addr = (u64)(*addr_hi) << 32 | (u64)(*addr_lo);
167 (*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
168 sn_msi_info[vector].pci_addr = 0;
169
170 nasid = cpuid_to_nasid(cpu);
171 slice = cpuid_to_slice(cpu);
172
173 new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
174 sn_msi_info[vector].sn_irq_info = new_irq_info;
175 if (new_irq_info == NULL)
176 return;
177
178 /*
179 * Map the xio address into bus space
180 */
181
182 bus_addr = (*provider->dma_map_consistent)(pdev,
183 new_irq_info->irq_xtalkaddr,
184 sizeof(new_irq_info->irq_xtalkaddr),
185 SN_DMA_MSI|SN_DMA_ADDR_XIO);
186
187 sn_msi_info[vector].pci_addr = bus_addr;
188 *addr_hi = (u32)(bus_addr >> 32);
189 *addr_lo = (u32)(bus_addr & 0x00000000ffffffff);
190}
191
192struct msi_ops sn_msi_ops = {
193 .setup = sn_msi_setup,
194 .teardown = sn_msi_teardown,
195#ifdef CONFIG_SMP
196 .target = sn_msi_target,
197#endif
198};
199
200int
201sn_msi_init(void)
202{
203 sn_msi_info =
204 kzalloc(sizeof(struct sn_msi_info) * NR_VECTORS, GFP_KERNEL);
205 if (! sn_msi_info)
206 return -ENOMEM;
207
208 msi_register(&sn_msi_ops);
209 return 0;
210}