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msi_sn.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2006 Silicon Graphics, Inc.  All Rights Reserved.
 */

#include <linux/types.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/cpumask.h>
#include <linux/msi.h>

#include <asm/sn/addrs.h>
#include <asm/sn/intr.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/nodepda.h>

struct sn_msi_info {
      u64 pci_addr;
      struct sn_irq_info *sn_irq_info;
};

static struct sn_msi_info sn_msi_info[NR_IRQS];

static struct irq_chip sn_msi_chip;

void sn_teardown_msi_irq(unsigned int irq)
{
      nasid_t nasid;
      int widget;
      struct pci_dev *pdev;
      struct pcidev_info *sn_pdev;
      struct sn_irq_info *sn_irq_info;
      struct pcibus_bussoft *bussoft;
      struct sn_pcibus_provider *provider;

      sn_irq_info = sn_msi_info[irq].sn_irq_info;
      if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
            return;

      sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
      pdev = sn_pdev->pdi_linux_pcidev;
      provider = SN_PCIDEV_BUSPROVIDER(pdev);

      (*provider->dma_unmap)(pdev,
                         sn_msi_info[irq].pci_addr,
                         PCI_DMA_FROMDEVICE);
      sn_msi_info[irq].pci_addr = 0;

      bussoft = SN_PCIDEV_BUSSOFT(pdev);
      nasid = NASID_GET(bussoft->bs_base);
      widget = (nasid & 1) ?
                  TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
                  SWIN_WIDGETNUM(bussoft->bs_base);

      sn_intr_free(nasid, widget, sn_irq_info);
      sn_msi_info[irq].sn_irq_info = NULL;

      destroy_irq(irq);
}

int sn_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *entry)
{
      struct msi_msg msg;
      int widget;
      int status;
      nasid_t nasid;
      u64 bus_addr;
      struct sn_irq_info *sn_irq_info;
      struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
      struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
      int irq;

      if (!entry->msi_attrib.is_64)
            return -EINVAL;

      if (bussoft == NULL)
            return -EINVAL;

      if (provider == NULL || provider->dma_map_consistent == NULL)
            return -EINVAL;

      irq = create_irq();
      if (irq < 0)
            return irq;

      /*
       * Set up the vector plumbing.  Let the prom (via sn_intr_alloc)
       * decide which cpu to direct this msi at by default.
       */

      nasid = NASID_GET(bussoft->bs_base);
      widget = (nasid & 1) ?
                  TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
                  SWIN_WIDGETNUM(bussoft->bs_base);

      sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
      if (! sn_irq_info) {
            destroy_irq(irq);
            return -ENOMEM;
      }

      status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
      if (status) {
            kfree(sn_irq_info);
            destroy_irq(irq);
            return -ENOMEM;
      }

      sn_irq_info->irq_int_bit = -1;            /* mark this as an MSI irq */
      sn_irq_fixup(pdev, sn_irq_info);

      /* Prom probably should fill these in, but doesn't ... */
      sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
      sn_irq_info->irq_bridge = (void *)bussoft->bs_base;

      /*
       * Map the xio address into bus space
       */
      bus_addr = (*provider->dma_map_consistent)(pdev,
                              sn_irq_info->irq_xtalkaddr,
                              sizeof(sn_irq_info->irq_xtalkaddr),
                              SN_DMA_MSI|SN_DMA_ADDR_XIO);
      if (! bus_addr) {
            sn_intr_free(nasid, widget, sn_irq_info);
            kfree(sn_irq_info);
            destroy_irq(irq);
            return -ENOMEM;
      }

      sn_msi_info[irq].sn_irq_info = sn_irq_info;
      sn_msi_info[irq].pci_addr = bus_addr;

      msg.address_hi = (u32)(bus_addr >> 32);
      msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);

      /*
       * In the SN platform, bit 16 is a "send vector" bit which
       * must be present in order to move the vector through the system.
       */
      msg.data = 0x100 + irq;

      set_irq_msi(irq, entry);
      write_msi_msg(irq, &msg);
      set_irq_chip_and_handler(irq, &sn_msi_chip, handle_edge_irq);

      return 0;
}

#ifdef CONFIG_SMP
static void sn_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
{
      struct msi_msg msg;
      int slice;
      nasid_t nasid;
      u64 bus_addr;
      struct pci_dev *pdev;
      struct pcidev_info *sn_pdev;
      struct sn_irq_info *sn_irq_info;
      struct sn_irq_info *new_irq_info;
      struct sn_pcibus_provider *provider;
      unsigned int cpu;

      cpu = first_cpu(cpu_mask);
      sn_irq_info = sn_msi_info[irq].sn_irq_info;
      if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
            return;

      /*
       * Release XIO resources for the old MSI PCI address
       */

      read_msi_msg(irq, &msg);
        sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
      pdev = sn_pdev->pdi_linux_pcidev;
      provider = SN_PCIDEV_BUSPROVIDER(pdev);

      bus_addr = (u64)(msg.address_hi) << 32 | (u64)(msg.address_lo);
      (*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
      sn_msi_info[irq].pci_addr = 0;

      nasid = cpuid_to_nasid(cpu);
      slice = cpuid_to_slice(cpu);

      new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
      sn_msi_info[irq].sn_irq_info = new_irq_info;
      if (new_irq_info == NULL)
            return;

      /*
       * Map the xio address into bus space
       */

      bus_addr = (*provider->dma_map_consistent)(pdev,
                              new_irq_info->irq_xtalkaddr,
                              sizeof(new_irq_info->irq_xtalkaddr),
                              SN_DMA_MSI|SN_DMA_ADDR_XIO);

      sn_msi_info[irq].pci_addr = bus_addr;
      msg.address_hi = (u32)(bus_addr >> 32);
      msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);

      write_msi_msg(irq, &msg);
      irq_desc[irq].affinity = cpu_mask;
}
#endif /* CONFIG_SMP */

static void sn_ack_msi_irq(unsigned int irq)
{
      move_native_irq(irq);
      ia64_eoi();
}

static int sn_msi_retrigger_irq(unsigned int irq)
{
      unsigned int vector = irq;
      ia64_resend_irq(vector);

      return 1;
}

static struct irq_chip sn_msi_chip = {
      .name       = "PCI-MSI",
      .mask       = mask_msi_irq,
      .unmask           = unmask_msi_irq,
      .ack        = sn_ack_msi_irq,
#ifdef CONFIG_SMP
      .set_affinity     = sn_set_msi_irq_affinity,
#endif
      .retrigger  = sn_msi_retrigger_irq,
};

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