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spu_manage.c

/*
 * spu management operations for of based platforms
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 * Copyright 2006 Sony Corp.
 * (C) Copyright 2007 TOSHIBA CORPORATION
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/device.h>

#include <asm/spu.h>
#include <asm/spu_priv1.h>
#include <asm/firmware.h>
#include <asm/prom.h>

#include "spufs/spufs.h"
#include "interrupt.h"

struct device_node *spu_devnode(struct spu *spu)
{
      return spu->devnode;
}

EXPORT_SYMBOL_GPL(spu_devnode);

static u64 __init find_spu_unit_number(struct device_node *spe)
{
      const unsigned int *prop;
      int proplen;

      /* new device trees should provide the physical-id attribute */
      prop = of_get_property(spe, "physical-id", &proplen);
      if (proplen == 4)
            return (u64)*prop;

      /* celleb device tree provides the unit-id */
      prop = of_get_property(spe, "unit-id", &proplen);
      if (proplen == 4)
            return (u64)*prop;

      /* legacy device trees provide the id in the reg attribute */
      prop = of_get_property(spe, "reg", &proplen);
      if (proplen == 4)
            return (u64)*prop;

      return 0;
}

static void spu_unmap(struct spu *spu)
{
      if (!firmware_has_feature(FW_FEATURE_LPAR))
            iounmap(spu->priv1);
      iounmap(spu->priv2);
      iounmap(spu->problem);
      iounmap((__force u8 __iomem *)spu->local_store);
}

static int __init spu_map_interrupts_old(struct spu *spu,
      struct device_node *np)
{
      unsigned int isrc;
      const u32 *tmp;
      int nid;

      /* Get the interrupt source unit from the device-tree */
      tmp = of_get_property(np, "isrc", NULL);
      if (!tmp)
            return -ENODEV;
      isrc = tmp[0];

      tmp = of_get_property(np->parent->parent, "node-id", NULL);
      if (!tmp) {
            printk(KERN_WARNING "%s: can't find node-id\n", __func__);
            nid = spu->node;
      } else
            nid = tmp[0];

      /* Add the node number */
      isrc |= nid << IIC_IRQ_NODE_SHIFT;

      /* Now map interrupts of all 3 classes */
      spu->irqs[0] = irq_create_mapping(NULL, IIC_IRQ_CLASS_0 | isrc);
      spu->irqs[1] = irq_create_mapping(NULL, IIC_IRQ_CLASS_1 | isrc);
      spu->irqs[2] = irq_create_mapping(NULL, IIC_IRQ_CLASS_2 | isrc);

      /* Right now, we only fail if class 2 failed */
      return spu->irqs[2] == NO_IRQ ? -EINVAL : 0;
}

static void __iomem * __init spu_map_prop_old(struct spu *spu,
                                    struct device_node *n,
                                    const char *name)
{
      const struct address_prop {
            unsigned long address;
            unsigned int len;
      } __attribute__((packed)) *prop;
      int proplen;

      prop = of_get_property(n, name, &proplen);
      if (prop == NULL || proplen != sizeof (struct address_prop))
            return NULL;

      return ioremap(prop->address, prop->len);
}

static int __init spu_map_device_old(struct spu *spu)
{
      struct device_node *node = spu->devnode;
      const char *prop;
      int ret;

      ret = -ENODEV;
      spu->name = of_get_property(node, "name", NULL);
      if (!spu->name)
            goto out;

      prop = of_get_property(node, "local-store", NULL);
      if (!prop)
            goto out;
      spu->local_store_phys = *(unsigned long *)prop;

      /* we use local store as ram, not io memory */
      spu->local_store = (void __force *)
            spu_map_prop_old(spu, node, "local-store");
      if (!spu->local_store)
            goto out;

      prop = of_get_property(node, "problem", NULL);
      if (!prop)
            goto out_unmap;
      spu->problem_phys = *(unsigned long *)prop;

      spu->problem = spu_map_prop_old(spu, node, "problem");
      if (!spu->problem)
            goto out_unmap;

      spu->priv2 = spu_map_prop_old(spu, node, "priv2");
      if (!spu->priv2)
            goto out_unmap;

      if (!firmware_has_feature(FW_FEATURE_LPAR)) {
            spu->priv1 = spu_map_prop_old(spu, node, "priv1");
            if (!spu->priv1)
                  goto out_unmap;
      }

      ret = 0;
      goto out;

out_unmap:
      spu_unmap(spu);
out:
      return ret;
}

static int __init spu_map_interrupts(struct spu *spu, struct device_node *np)
{
      struct of_irq oirq;
      int ret;
      int i;

      for (i=0; i < 3; i++) {
            ret = of_irq_map_one(np, i, &oirq);
            if (ret) {
                  pr_debug("spu_new: failed to get irq %d\n", i);
                  goto err;
            }
            ret = -EINVAL;
            pr_debug("  irq %d no 0x%x on %s\n", i, oirq.specifier[0],
                   oirq.controller->full_name);
            spu->irqs[i] = irq_create_of_mapping(oirq.controller,
                              oirq.specifier, oirq.size);
            if (spu->irqs[i] == NO_IRQ) {
                  pr_debug("spu_new: failed to map it !\n");
                  goto err;
            }
      }
      return 0;

err:
      pr_debug("failed to map irq %x for spu %s\n", *oirq.specifier,
            spu->name);
      for (; i >= 0; i--) {
            if (spu->irqs[i] != NO_IRQ)
                  irq_dispose_mapping(spu->irqs[i]);
      }
      return ret;
}

static int spu_map_resource(struct spu *spu, int nr,
                      void __iomem** virt, unsigned long *phys)
{
      struct device_node *np = spu->devnode;
      struct resource resource = { };
      unsigned long len;
      int ret;

      ret = of_address_to_resource(np, nr, &resource);
      if (ret)
            return ret;
      if (phys)
            *phys = resource.start;
      len = resource.end - resource.start + 1;
      *virt = ioremap(resource.start, len);
      if (!*virt)
            return -EINVAL;
      return 0;
}

static int __init spu_map_device(struct spu *spu)
{
      struct device_node *np = spu->devnode;
      int ret = -ENODEV;

      spu->name = of_get_property(np, "name", NULL);
      if (!spu->name)
            goto out;

      ret = spu_map_resource(spu, 0, (void __iomem**)&spu->local_store,
                         &spu->local_store_phys);
      if (ret) {
            pr_debug("spu_new: failed to map %s resource 0\n",
                   np->full_name);
            goto out;
      }
      ret = spu_map_resource(spu, 1, (void __iomem**)&spu->problem,
                         &spu->problem_phys);
      if (ret) {
            pr_debug("spu_new: failed to map %s resource 1\n",
                   np->full_name);
            goto out_unmap;
      }
      ret = spu_map_resource(spu, 2, (void __iomem**)&spu->priv2, NULL);
      if (ret) {
            pr_debug("spu_new: failed to map %s resource 2\n",
                   np->full_name);
            goto out_unmap;
      }
      if (!firmware_has_feature(FW_FEATURE_LPAR))
            ret = spu_map_resource(spu, 3,
                         (void __iomem**)&spu->priv1, NULL);
      if (ret) {
            pr_debug("spu_new: failed to map %s resource 3\n",
                   np->full_name);
            goto out_unmap;
      }
      pr_debug("spu_new: %s maps:\n", np->full_name);
      pr_debug("  local store   : 0x%016lx -> 0x%p\n",
             spu->local_store_phys, spu->local_store);
      pr_debug("  problem state : 0x%016lx -> 0x%p\n",
             spu->problem_phys, spu->problem);
      pr_debug("  priv2         :                       0x%p\n", spu->priv2);
      pr_debug("  priv1         :                       0x%p\n", spu->priv1);

      return 0;

out_unmap:
      spu_unmap(spu);
out:
      pr_debug("failed to map spe %s: %d\n", spu->name, ret);
      return ret;
}

static int __init of_enumerate_spus(int (*fn)(void *data))
{
      int ret;
      struct device_node *node;
      unsigned int n = 0;

      ret = -ENODEV;
      for (node = of_find_node_by_type(NULL, "spe");
                  node; node = of_find_node_by_type(node, "spe")) {
            ret = fn(node);
            if (ret) {
                  printk(KERN_WARNING "%s: Error initializing %s\n",
                        __func__, node->name);
                  break;
            }
            n++;
      }
      return ret ? ret : n;
}

static int __init of_create_spu(struct spu *spu, void *data)
{
      int ret;
      struct device_node *spe = (struct device_node *)data;
      static int legacy_map = 0, legacy_irq = 0;

      spu->devnode = of_node_get(spe);
      spu->spe_id = find_spu_unit_number(spe);

      spu->node = of_node_to_nid(spe);
      if (spu->node >= MAX_NUMNODES) {
            printk(KERN_WARNING "SPE %s on node %d ignored,"
                   " node number too big\n", spe->full_name, spu->node);
            printk(KERN_WARNING "Check if CONFIG_NUMA is enabled.\n");
            ret = -ENODEV;
            goto out;
      }

      ret = spu_map_device(spu);
      if (ret) {
            if (!legacy_map) {
                  legacy_map = 1;
                  printk(KERN_WARNING "%s: Legacy device tree found, "
                        "trying to map old style\n", __func__);
            }
            ret = spu_map_device_old(spu);
            if (ret) {
                  printk(KERN_ERR "Unable to map %s\n",
                        spu->name);
                  goto out;
            }
      }

      ret = spu_map_interrupts(spu, spe);
      if (ret) {
            if (!legacy_irq) {
                  legacy_irq = 1;
                  printk(KERN_WARNING "%s: Legacy device tree found, "
                        "trying old style irq\n", __func__);
            }
            ret = spu_map_interrupts_old(spu, spe);
            if (ret) {
                  printk(KERN_ERR "%s: could not map interrupts\n",
                        spu->name);
                  goto out_unmap;
            }
      }

      pr_debug("Using SPE %s %p %p %p %p %d\n", spu->name,
            spu->local_store, spu->problem, spu->priv1,
            spu->priv2, spu->number);
      goto out;

out_unmap:
      spu_unmap(spu);
out:
      return ret;
}

static int of_destroy_spu(struct spu *spu)
{
      spu_unmap(spu);
      of_node_put(spu->devnode);
      return 0;
}

static void enable_spu_by_master_run(struct spu_context *ctx)
{
      ctx->ops->master_start(ctx);
}

static void disable_spu_by_master_run(struct spu_context *ctx)
{
      ctx->ops->master_stop(ctx);
}

/* Hardcoded affinity idxs for qs20 */
#define QS20_SPES_PER_BE 8
static int qs20_reg_idxs[QS20_SPES_PER_BE] =   { 0, 2, 4, 6, 7, 5, 3, 1 };
static int qs20_reg_memory[QS20_SPES_PER_BE] = { 1, 1, 0, 0, 0, 0, 0, 0 };

static struct spu *spu_lookup_reg(int node, u32 reg)
{
      struct spu *spu;
      const u32 *spu_reg;

      list_for_each_entry(spu, &cbe_spu_info[node].spus, cbe_list) {
            spu_reg = of_get_property(spu_devnode(spu), "reg", NULL);
            if (*spu_reg == reg)
                  return spu;
      }
      return NULL;
}

static void init_affinity_qs20_harcoded(void)
{
      int node, i;
      struct spu *last_spu, *spu;
      u32 reg;

      for (node = 0; node < MAX_NUMNODES; node++) {
            last_spu = NULL;
            for (i = 0; i < QS20_SPES_PER_BE; i++) {
                  reg = qs20_reg_idxs[i];
                  spu = spu_lookup_reg(node, reg);
                  if (!spu)
                        continue;
                  spu->has_mem_affinity = qs20_reg_memory[reg];
                  if (last_spu)
                        list_add_tail(&spu->aff_list,
                                    &last_spu->aff_list);
                  last_spu = spu;
            }
      }
}

static int of_has_vicinity(void)
{
      struct device_node *dn;

      for_each_node_by_type(dn, "spe") {
            if (of_find_property(dn, "vicinity", NULL))  {
                  of_node_put(dn);
                  return 1;
            }
      }
      return 0;
}

static struct spu *devnode_spu(int cbe, struct device_node *dn)
{
      struct spu *spu;

      list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list)
            if (spu_devnode(spu) == dn)
                  return spu;
      return NULL;
}

static struct spu *
neighbour_spu(int cbe, struct device_node *target, struct device_node *avoid)
{
      struct spu *spu;
      struct device_node *spu_dn;
      const phandle *vic_handles;
      int lenp, i;

      list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list) {
            spu_dn = spu_devnode(spu);
            if (spu_dn == avoid)
                  continue;
            vic_handles = of_get_property(spu_dn, "vicinity", &lenp);
            for (i=0; i < (lenp / sizeof(phandle)); i++) {
                  if (vic_handles[i] == target->linux_phandle)
                        return spu;
            }
      }
      return NULL;
}

static void init_affinity_node(int cbe)
{
      struct spu *spu, *last_spu;
      struct device_node *vic_dn, *last_spu_dn;
      phandle avoid_ph;
      const phandle *vic_handles;
      const char *name;
      int lenp, i, added;

      last_spu = list_first_entry(&cbe_spu_info[cbe].spus, struct spu,
                                                cbe_list);
      avoid_ph = 0;
      for (added = 1; added < cbe_spu_info[cbe].n_spus; added++) {
            last_spu_dn = spu_devnode(last_spu);
            vic_handles = of_get_property(last_spu_dn, "vicinity", &lenp);

            /*
             * Walk through each phandle in vicinity property of the spu
             * (tipically two vicinity phandles per spe node)
             */
            for (i = 0; i < (lenp / sizeof(phandle)); i++) {
                  if (vic_handles[i] == avoid_ph)
                        continue;

                  vic_dn = of_find_node_by_phandle(vic_handles[i]);
                  if (!vic_dn)
                        continue;

                  /* a neighbour might be spe, mic-tm, or bif0 */
                  name = of_get_property(vic_dn, "name", NULL);
                  if (!name)
                        continue;

                  if (strcmp(name, "spe") == 0) {
                        spu = devnode_spu(cbe, vic_dn);
                        avoid_ph = last_spu_dn->linux_phandle;
                  } else {
                        /*
                         * "mic-tm" and "bif0" nodes do not have
                         * vicinity property. So we need to find the
                         * spe which has vic_dn as neighbour, but
                         * skipping the one we came from (last_spu_dn)
                         */
                        spu = neighbour_spu(cbe, vic_dn, last_spu_dn);
                        if (!spu)
                              continue;
                        if (!strcmp(name, "mic-tm")) {
                              last_spu->has_mem_affinity = 1;
                              spu->has_mem_affinity = 1;
                        }
                        avoid_ph = vic_dn->linux_phandle;
                  }

                  list_add_tail(&spu->aff_list, &last_spu->aff_list);
                  last_spu = spu;
                  break;
            }
      }
}

static void init_affinity_fw(void)
{
      int cbe;

      for (cbe = 0; cbe < MAX_NUMNODES; cbe++)
            init_affinity_node(cbe);
}

static int __init init_affinity(void)
{
      if (of_has_vicinity()) {
            init_affinity_fw();
      } else {
            long root = of_get_flat_dt_root();
            if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0"))
                  init_affinity_qs20_harcoded();
            else
                  printk("No affinity configuration found\n");
      }

      return 0;
}

const struct spu_management_ops spu_management_of_ops = {
      .enumerate_spus = of_enumerate_spus,
      .create_spu = of_create_spu,
      .destroy_spu = of_destroy_spu,
      .enable_spu = enable_spu_by_master_run,
      .disable_spu = disable_spu_by_master_run,
      .init_affinity = init_affinity,
};

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