1 files changed, 447 insertions, 0 deletions

diff --git a/arch/sparc/kernel/pci_msi.c b/arch/sparc/kernel/pci_msi.c
new file mode 100644
index 00000000000..2e680f34f72
--- /dev/null
+++ b/arch/sparc/kernel/pci_msi.c
@@ -0,0 +1,447 @@
+/* pci_msi.c: Sparc64 MSI support common layer.
+ *
+ * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
+ */
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include "pci_impl.h"
+
+static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
+{
+        struct sparc64_msiq_cookie *msiq_cookie = cookie;
+        struct pci_pbm_info *pbm = msiq_cookie->pbm;
+        unsigned long msiqid = msiq_cookie->msiqid;
+        const struct sparc64_msiq_ops *ops;
+        unsigned long orig_head, head;
+        int err;
+
+        ops = pbm->msi_ops;
+
+        err = ops->get_head(pbm, msiqid, &head);
+        if (unlikely(err < 0))
+                goto err_get_head;
+
+        orig_head = head;
+        for (;;) {
+                unsigned long msi;
+
+                err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
+                if (likely(err > 0)) {
+                        struct irq_desc *desc;
+                        unsigned int virt_irq;
+
+                        virt_irq = pbm->msi_irq_table[msi - pbm->msi_first];
+                        desc = irq_desc + virt_irq;
+
+                        desc->handle_irq(virt_irq, desc);
+                }
+
+                if (unlikely(err < 0))
+                        goto err_dequeue;
+
+                if (err == 0)
+                        break;
+        }
+        if (likely(head != orig_head)) {
+                err = ops->set_head(pbm, msiqid, head);
+                if (unlikely(err < 0))
+                        goto err_set_head;
+        }
+        return IRQ_HANDLED;
+
+err_get_head:
+        printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
+               msiqid, err);
+        goto err_out;
+
+err_dequeue:
+        printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
+               "gives error %d\n",
+               head, msiqid, err);
+        goto err_out;
+
+err_set_head:
+        printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
+               "gives error %d\n",
+               head, msiqid, err);
+        goto err_out;
+
+err_out:
+        return IRQ_NONE;
+}
+
+static u32 pick_msiq(struct pci_pbm_info *pbm)
+{
+        static DEFINE_SPINLOCK(rotor_lock);
+        unsigned long flags;
+        u32 ret, rotor;
+
+        spin_lock_irqsave(&rotor_lock, flags);
+
+        rotor = pbm->msiq_rotor;
+        ret = pbm->msiq_first + rotor;
+
+        if (++rotor >= pbm->msiq_num)
+                rotor = 0;
+        pbm->msiq_rotor = rotor;
+
+        spin_unlock_irqrestore(&rotor_lock, flags);
+
+        return ret;
+}
+
+
+static int alloc_msi(struct pci_pbm_info *pbm)
+{
+        int i;
+
+        for (i = 0; i < pbm->msi_num; i++) {
+                if (!test_and_set_bit(i, pbm->msi_bitmap))
+                        return i + pbm->msi_first;
+        }
+
+        return -ENOENT;
+}
+
+static void free_msi(struct pci_pbm_info *pbm, int msi_num)
+{
+        msi_num -= pbm->msi_first;
+        clear_bit(msi_num, pbm->msi_bitmap);
+}
+
+static struct irq_chip msi_irq = {
+        .typename       = "PCI-MSI",
+        .mask           = mask_msi_irq,
+        .unmask         = unmask_msi_irq,
+        .enable         = unmask_msi_irq,
+        .disable        = mask_msi_irq,
+        /* XXX affinity XXX */
+};
+
+static int sparc64_setup_msi_irq(unsigned int *virt_irq_p,
+                                 struct pci_dev *pdev,
+                                 struct msi_desc *entry)
+{
+        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
+        const struct sparc64_msiq_ops *ops = pbm->msi_ops;
+        struct msi_msg msg;
+        int msi, err;
+        u32 msiqid;
+
+        *virt_irq_p = virt_irq_alloc(0, 0);
+        err = -ENOMEM;
+        if (!*virt_irq_p)
+                goto out_err;
+
+        set_irq_chip_and_handler_name(*virt_irq_p, &msi_irq,
+                                      handle_simple_irq, "MSI");
+
+        err = alloc_msi(pbm);
+        if (unlikely(err < 0))
+                goto out_virt_irq_free;
+
+        msi = err;
+
+        msiqid = pick_msiq(pbm);
+
+        err = ops->msi_setup(pbm, msiqid, msi,
+                             (entry->msi_attrib.is_64 ? 1 : 0));
+        if (err)
+                goto out_msi_free;
+
+        pbm->msi_irq_table[msi - pbm->msi_first] = *virt_irq_p;
+
+        if (entry->msi_attrib.is_64) {
+                msg.address_hi = pbm->msi64_start >> 32;
+                msg.address_lo = pbm->msi64_start & 0xffffffff;
+        } else {
+                msg.address_hi = 0;
+                msg.address_lo = pbm->msi32_start;
+        }
+        msg.data = msi;
+
+        set_irq_msi(*virt_irq_p, entry);
+        write_msi_msg(*virt_irq_p, &msg);
+
+        return 0;
+
+out_msi_free:
+        free_msi(pbm, msi);
+
+out_virt_irq_free:
+        set_irq_chip(*virt_irq_p, NULL);
+        virt_irq_free(*virt_irq_p);
+        *virt_irq_p = 0;
+
+out_err:
+        return err;
+}
+
+static void sparc64_teardown_msi_irq(unsigned int virt_irq,
+                                     struct pci_dev *pdev)
+{
+        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
+        const struct sparc64_msiq_ops *ops = pbm->msi_ops;
+        unsigned int msi_num;
+        int i, err;
+
+        for (i = 0; i < pbm->msi_num; i++) {
+                if (pbm->msi_irq_table[i] == virt_irq)
+                        break;
+        }
+        if (i >= pbm->msi_num) {
+                printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
+                       pbm->name, virt_irq);
+                return;
+        }
+
+        msi_num = pbm->msi_first + i;
+        pbm->msi_irq_table[i] = ~0U;
+
+        err = ops->msi_teardown(pbm, msi_num);
+        if (err) {
+                printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
+                       "irq %u, gives error %d\n",
+                       pbm->name, msi_num, virt_irq, err);
+                return;
+        }
+
+        free_msi(pbm, msi_num);
+
+        set_irq_chip(virt_irq, NULL);
+        virt_irq_free(virt_irq);
+}
+
+static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
+{
+        unsigned long size, bits_per_ulong;
+
+        bits_per_ulong = sizeof(unsigned long) * 8;
+        size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
+        size /= 8;
+        BUG_ON(size % sizeof(unsigned long));
+
+        pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
+        if (!pbm->msi_bitmap)
+                return -ENOMEM;
+
+        return 0;
+}
+
+static void msi_bitmap_free(struct pci_pbm_info *pbm)
+{
+        kfree(pbm->msi_bitmap);
+        pbm->msi_bitmap = NULL;
+}
+
+static int msi_table_alloc(struct pci_pbm_info *pbm)
+{
+        int size, i;
+
+        size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
+        pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
+        if (!pbm->msiq_irq_cookies)
+                return -ENOMEM;
+
+        for (i = 0; i < pbm->msiq_num; i++) {
+                struct sparc64_msiq_cookie *p;
+
+                p = &pbm->msiq_irq_cookies[i];
+                p->pbm = pbm;
+                p->msiqid = pbm->msiq_first + i;
+        }
+
+        size = pbm->msi_num * sizeof(unsigned int);
+        pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
+        if (!pbm->msi_irq_table) {
+                kfree(pbm->msiq_irq_cookies);
+                pbm->msiq_irq_cookies = NULL;
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static void msi_table_free(struct pci_pbm_info *pbm)
+{
+        kfree(pbm->msiq_irq_cookies);
+        pbm->msiq_irq_cookies = NULL;
+
+        kfree(pbm->msi_irq_table);
+        pbm->msi_irq_table = NULL;
+}
+
+static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
+                                 const struct sparc64_msiq_ops *ops,
+                                 unsigned long msiqid,
+                                 unsigned long devino)
+{
+        int irq = ops->msiq_build_irq(pbm, msiqid, devino);
+        int err, nid;
+
+        if (irq < 0)
+                return irq;
+
+        nid = pbm->numa_node;
+        if (nid != -1) {
+                cpumask_t numa_mask = node_to_cpumask(nid);
+
+                irq_set_affinity(irq, numa_mask);
+        }
+        err = request_irq(irq, sparc64_msiq_interrupt, 0,
+                          "MSIQ",
+                          &pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
+        if (err)
+                return err;
+
+        return 0;
+}
+
+static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
+                                      const struct sparc64_msiq_ops *ops)
+{
+        int i;
+
+        for (i = 0; i < pbm->msiq_num; i++) {
+                unsigned long msiqid = i + pbm->msiq_first;
+                unsigned long devino = i + pbm->msiq_first_devino;
+                int err;
+
+                err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
+                if (err)
+                        return err;
+        }
+
+        return 0;
+}
+
+void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
+                          const struct sparc64_msiq_ops *ops)
+{
+        const u32 *val;
+        int len;
+
+        val = of_get_property(pbm->op->node, "#msi-eqs", &len);
+        if (!val || len != 4)
+                goto no_msi;
+        pbm->msiq_num = *val;
+        if (pbm->msiq_num) {
+                const struct msiq_prop {
+                        u32 first_msiq;
+                        u32 num_msiq;
+                        u32 first_devino;
+                } *mqp;
+                const struct msi_range_prop {
+                        u32 first_msi;
+                        u32 num_msi;
+                } *mrng;
+                const struct addr_range_prop {
+                        u32 msi32_high;
+                        u32 msi32_low;
+                        u32 msi32_len;
+                        u32 msi64_high;
+                        u32 msi64_low;
+                        u32 msi64_len;
+                } *arng;
+
+                val = of_get_property(pbm->op->node, "msi-eq-size", &len);
+                if (!val || len != 4)
+                        goto no_msi;
+
+                pbm->msiq_ent_count = *val;
+
+                mqp = of_get_property(pbm->op->node,
+                                      "msi-eq-to-devino", &len);
+                if (!mqp)
+                        mqp = of_get_property(pbm->op->node,
+                                              "msi-eq-devino", &len);
+                if (!mqp || len != sizeof(struct msiq_prop))
+                        goto no_msi;
+
+                pbm->msiq_first = mqp->first_msiq;
+                pbm->msiq_first_devino = mqp->first_devino;
+
+                val = of_get_property(pbm->op->node, "#msi", &len);
+                if (!val || len != 4)
+                        goto no_msi;
+                pbm->msi_num = *val;
+
+                mrng = of_get_property(pbm->op->node, "msi-ranges", &len);
+                if (!mrng || len != sizeof(struct msi_range_prop))
+                        goto no_msi;
+                pbm->msi_first = mrng->first_msi;
+
+                val = of_get_property(pbm->op->node, "msi-data-mask", &len);
+                if (!val || len != 4)
+                        goto no_msi;
+                pbm->msi_data_mask = *val;
+
+                val = of_get_property(pbm->op->node, "msix-data-width", &len);
+                if (!val || len != 4)
+                        goto no_msi;
+                pbm->msix_data_width = *val;
+
+                arng = of_get_property(pbm->op->node, "msi-address-ranges",
+                                       &len);
+                if (!arng || len != sizeof(struct addr_range_prop))
+                        goto no_msi;
+                pbm->msi32_start = ((u64)arng->msi32_high << 32) |
+                        (u64) arng->msi32_low;
+                pbm->msi64_start = ((u64)arng->msi64_high << 32) |
+                        (u64) arng->msi64_low;
+                pbm->msi32_len = arng->msi32_len;
+                pbm->msi64_len = arng->msi64_len;
+
+                if (msi_bitmap_alloc(pbm))
+                        goto no_msi;
+
+                if (msi_table_alloc(pbm)) {
+                        msi_bitmap_free(pbm);
+                        goto no_msi;
+                }
+
+                if (ops->msiq_alloc(pbm)) {
+                        msi_table_free(pbm);
+                        msi_bitmap_free(pbm);
+                        goto no_msi;
+                }
+
+                if (sparc64_bringup_msi_queues(pbm, ops)) {
+                        ops->msiq_free(pbm);
+                        msi_table_free(pbm);
+                        msi_bitmap_free(pbm);
+                        goto no_msi;
+                }
+
+                printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
+                       "devino[0x%x]\n",
+                       pbm->name,
+                       pbm->msiq_first, pbm->msiq_num,
+                       pbm->msiq_ent_count,
+                       pbm->msiq_first_devino);
+                printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
+                       "width[%u]\n",
+                       pbm->name,
+                       pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
+                       pbm->msix_data_width);
+                printk(KERN_INFO "%s: MSI addr32[0x%lx:0x%x] "
+                       "addr64[0x%lx:0x%x]\n",
+                       pbm->name,
+                       pbm->msi32_start, pbm->msi32_len,
+                       pbm->msi64_start, pbm->msi64_len);
+                printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
+                       pbm->name,
+                       __pa(pbm->msi_queues));
+
+                pbm->msi_ops = ops;
+                pbm->setup_msi_irq = sparc64_setup_msi_irq;
+                pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
+        }
+        return;
+
+no_msi:
+        pbm->msiq_num = 0;
+        printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
+}