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Linux/arch/ia64/sn/kernel/msi_sn.c

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  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/irq.h>
 11 #include <linux/pci.h>
 12 #include <linux/cpumask.h>
 13 #include <linux/msi.h>
 14 #include <linux/slab.h>
 15 
 16 #include <asm/sn/addrs.h>
 17 #include <asm/sn/intr.h>
 18 #include <asm/sn/pcibus_provider_defs.h>
 19 #include <asm/sn/pcidev.h>
 20 #include <asm/sn/nodepda.h>
 21 
 22 struct sn_msi_info {
 23         u64 pci_addr;
 24         struct sn_irq_info *sn_irq_info;
 25 };
 26 
 27 static struct sn_msi_info sn_msi_info[NR_IRQS];
 28 
 29 static struct irq_chip sn_msi_chip;
 30 
 31 void sn_teardown_msi_irq(unsigned int irq)
 32 {
 33         nasid_t nasid;
 34         int widget;
 35         struct pci_dev *pdev;
 36         struct pcidev_info *sn_pdev;
 37         struct sn_irq_info *sn_irq_info;
 38         struct pcibus_bussoft *bussoft;
 39         struct sn_pcibus_provider *provider;
 40 
 41         sn_irq_info = sn_msi_info[irq].sn_irq_info;
 42         if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
 43                 return;
 44 
 45         sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
 46         pdev = sn_pdev->pdi_linux_pcidev;
 47         provider = SN_PCIDEV_BUSPROVIDER(pdev);
 48 
 49         (*provider->dma_unmap)(pdev,
 50                                sn_msi_info[irq].pci_addr,
 51                                PCI_DMA_FROMDEVICE);
 52         sn_msi_info[irq].pci_addr = 0;
 53 
 54         bussoft = SN_PCIDEV_BUSSOFT(pdev);
 55         nasid = NASID_GET(bussoft->bs_base);
 56         widget = (nasid & 1) ?
 57                         TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
 58                         SWIN_WIDGETNUM(bussoft->bs_base);
 59 
 60         sn_intr_free(nasid, widget, sn_irq_info);
 61         sn_msi_info[irq].sn_irq_info = NULL;
 62 
 63         destroy_irq(irq);
 64 }
 65 
 66 int sn_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *entry)
 67 {
 68         struct msi_msg msg;
 69         int widget;
 70         int status;
 71         nasid_t nasid;
 72         u64 bus_addr;
 73         struct sn_irq_info *sn_irq_info;
 74         struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
 75         struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
 76         int irq;
 77 
 78         if (!entry->msi_attrib.is_64)
 79                 return -EINVAL;
 80 
 81         if (bussoft == NULL)
 82                 return -EINVAL;
 83 
 84         if (provider == NULL || provider->dma_map_consistent == NULL)
 85                 return -EINVAL;
 86 
 87         irq = create_irq();
 88         if (irq < 0)
 89                 return irq;
 90 
 91         /*
 92          * Set up the vector plumbing.  Let the prom (via sn_intr_alloc)
 93          * decide which cpu to direct this msi at by default.
 94          */
 95 
 96         nasid = NASID_GET(bussoft->bs_base);
 97         widget = (nasid & 1) ?
 98                         TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
 99                         SWIN_WIDGETNUM(bussoft->bs_base);
100 
101         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
102         if (! sn_irq_info) {
103                 destroy_irq(irq);
104                 return -ENOMEM;
105         }
106 
107         status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
108         if (status) {
109                 kfree(sn_irq_info);
110                 destroy_irq(irq);
111                 return -ENOMEM;
112         }
113 
114         sn_irq_info->irq_int_bit = -1;          /* mark this as an MSI irq */
115         sn_irq_fixup(pdev, sn_irq_info);
116 
117         /* Prom probably should fill these in, but doesn't ... */
118         sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
119         sn_irq_info->irq_bridge = (void *)bussoft->bs_base;
120 
121         /*
122          * Map the xio address into bus space
123          */
124         bus_addr = (*provider->dma_map_consistent)(pdev,
125                                         sn_irq_info->irq_xtalkaddr,
126                                         sizeof(sn_irq_info->irq_xtalkaddr),
127                                         SN_DMA_MSI|SN_DMA_ADDR_XIO);
128         if (! bus_addr) {
129                 sn_intr_free(nasid, widget, sn_irq_info);
130                 kfree(sn_irq_info);
131                 destroy_irq(irq);
132                 return -ENOMEM;
133         }
134 
135         sn_msi_info[irq].sn_irq_info = sn_irq_info;
136         sn_msi_info[irq].pci_addr = bus_addr;
137 
138         msg.address_hi = (u32)(bus_addr >> 32);
139         msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
140 
141         /*
142          * In the SN platform, bit 16 is a "send vector" bit which
143          * must be present in order to move the vector through the system.
144          */
145         msg.data = 0x100 + irq;
146 
147         irq_set_msi_desc(irq, entry);
148         pci_write_msi_msg(irq, &msg);
149         irq_set_chip_and_handler(irq, &sn_msi_chip, handle_edge_irq);
150 
151         return 0;
152 }
153 
154 #ifdef CONFIG_SMP
155 static int sn_set_msi_irq_affinity(struct irq_data *data,
156                                    const struct cpumask *cpu_mask, bool force)
157 {
158         struct msi_msg msg;
159         int slice;
160         nasid_t nasid;
161         u64 bus_addr;
162         struct pci_dev *pdev;
163         struct pcidev_info *sn_pdev;
164         struct sn_irq_info *sn_irq_info;
165         struct sn_irq_info *new_irq_info;
166         struct sn_pcibus_provider *provider;
167         unsigned int cpu, irq = data->irq;
168 
169         cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
170         sn_irq_info = sn_msi_info[irq].sn_irq_info;
171         if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
172                 return -1;
173 
174         /*
175          * Release XIO resources for the old MSI PCI address
176          */
177 
178         __get_cached_msi_msg(irq_data_get_msi_desc(data), &msg);
179         sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
180         pdev = sn_pdev->pdi_linux_pcidev;
181         provider = SN_PCIDEV_BUSPROVIDER(pdev);
182 
183         bus_addr = (u64)(msg.address_hi) << 32 | (u64)(msg.address_lo);
184         (*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
185         sn_msi_info[irq].pci_addr = 0;
186 
187         nasid = cpuid_to_nasid(cpu);
188         slice = cpuid_to_slice(cpu);
189 
190         new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
191         sn_msi_info[irq].sn_irq_info = new_irq_info;
192         if (new_irq_info == NULL)
193                 return -1;
194 
195         /*
196          * Map the xio address into bus space
197          */
198 
199         bus_addr = (*provider->dma_map_consistent)(pdev,
200                                         new_irq_info->irq_xtalkaddr,
201                                         sizeof(new_irq_info->irq_xtalkaddr),
202                                         SN_DMA_MSI|SN_DMA_ADDR_XIO);
203 
204         sn_msi_info[irq].pci_addr = bus_addr;
205         msg.address_hi = (u32)(bus_addr >> 32);
206         msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
207 
208         pci_write_msi_msg(irq, &msg);
209         cpumask_copy(irq_data_get_affinity_mask(data), cpu_mask);
210 
211         return 0;
212 }
213 #endif /* CONFIG_SMP */
214 
215 static void sn_ack_msi_irq(struct irq_data *data)
216 {
217         irq_move_irq(data);
218         ia64_eoi();
219 }
220 
221 static int sn_msi_retrigger_irq(struct irq_data *data)
222 {
223         unsigned int vector = data->irq;
224         ia64_resend_irq(vector);
225 
226         return 1;
227 }
228 
229 static struct irq_chip sn_msi_chip = {
230         .name                   = "PCI-MSI",
231         .irq_mask               = pci_msi_mask_irq,
232         .irq_unmask             = pci_msi_unmask_irq,
233         .irq_ack                = sn_ack_msi_irq,
234 #ifdef CONFIG_SMP
235         .irq_set_affinity       = sn_set_msi_irq_affinity,
236 #endif
237         .irq_retrigger          = sn_msi_retrigger_irq,
238 };
239 

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