[PATCH] PCI: altix: msi support

MSI callouts for altix.  Involves a fair amount of code reorg in sn irq.c
code as well as adding some extensions to the altix PCI provider abstaction.

Signed-off-by: Mark Maule <maule@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 196 insertions, 4 deletions

diff --git a/drivers/pci/msi-altix.c b/drivers/pci/msi-altix.c
index 9bd240602c1e..bed4183a5e39 100644
--- a/drivers/pci/msi-altix.c
+++ b/drivers/pci/msi-altix.c
@@ -6,13 +6,205 @@
  * Copyright (C) 2006 Silicon Graphics, Inc.  All Rights Reserved.
  */
 
-#include <asm/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/cpumask.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>
+
+#include "msi.h"
+
+struct sn_msi_info {
+        u64 pci_addr;
+        struct sn_irq_info *sn_irq_info;
+};
+
+static struct sn_msi_info *sn_msi_info;
+
+static void
+sn_msi_teardown(unsigned int vector)
+{
+        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[vector].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[vector].pci_addr,
+                               PCI_DMA_FROMDEVICE);
+        sn_msi_info[vector].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[vector].sn_irq_info = NULL;
+
+        return;
+}
 
 int
-sn_msi_init(void)
+sn_msi_setup(struct pci_dev *pdev, unsigned int vector,
+             u32 *addr_hi, u32 *addr_lo, u32 *data)
 {
+        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);
+
+        if (bussoft == NULL)
+                return -EINVAL;
+
+        if (provider == NULL || provider->dma_map_consistent == NULL)
+                return -EINVAL;
+
+        /*
+         * 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)
+                return -ENOMEM;
+
+        status = sn_intr_alloc(nasid, widget, sn_irq_info, vector, -1, -1);
+        if (status) {
+                kfree(sn_irq_info);
+                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;
+
         /*
-         * return error until MSI is supported on altix platforms
+         * Map the xio address into bus space
          */
-        return -EINVAL;
+        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);
+                return -ENOMEM;
+        }
+
+        sn_msi_info[vector].sn_irq_info = sn_irq_info;
+        sn_msi_info[vector].pci_addr = bus_addr;
+
+        *addr_hi = (u32)(bus_addr >> 32);
+        *addr_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.
+         */
+        *data = 0x100 + (unsigned int)vector;
+
+#ifdef CONFIG_SMP
+        set_irq_affinity_info((vector & 0xff), sn_irq_info->irq_cpuid, 0);
+#endif
+
+        return 0;
+}
+
+static void
+sn_msi_target(unsigned int vector, unsigned int cpu,
+              u32 *addr_hi, u32 *addr_lo)
+{
+        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;
+
+        sn_irq_info = sn_msi_info[vector].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
+         */
+
+        sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
+        pdev = sn_pdev->pdi_linux_pcidev;
+        provider = SN_PCIDEV_BUSPROVIDER(pdev);
+
+        bus_addr = (u64)(*addr_hi) << 32 | (u64)(*addr_lo);
+        (*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
+        sn_msi_info[vector].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[vector].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[vector].pci_addr = bus_addr;
+        *addr_hi = (u32)(bus_addr >> 32);
+        *addr_lo = (u32)(bus_addr & 0x00000000ffffffff);
+}
+
+struct msi_ops sn_msi_ops = {
+        .setup = sn_msi_setup,
+        .teardown = sn_msi_teardown,
+#ifdef CONFIG_SMP
+        .target = sn_msi_target,
+#endif
+};
+
+int
+sn_msi_init(void)
+{
+        sn_msi_info =
+                kzalloc(sizeof(struct sn_msi_info) * NR_VECTORS, GFP_KERNEL);
+        if (! sn_msi_info)
+                return -ENOMEM;
+
+        msi_register(&sn_msi_ops);
+        return 0;
 }