[SPARC64]: Consolidate MSI support code.

This also makes us use the MSI queues correctly.

Each MSI queue is serviced by a normal sun4u/sun4v INO interrupt
handler.  This handler runs the MSI queue and dispatches the
virtual interrupts indicated by arriving MSIs in that MSI queue.

All of the common logic is placed in pci_msi.c, with callbacks to
handle the PCI controller specific aspects of the operations.

This common infrastructure will make it much easier to add MSG
support.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 103 insertions, 277 deletions

diff --git a/arch/sparc64/kernel/pci_fire.c b/arch/sparc64/kernel/pci_fire.c
index 090f26579678..bcf6a5d425ab 100644
--- a/arch/sparc64/kernel/pci_fire.c
+++ b/arch/sparc64/kernel/pci_fire.c
@@ -161,90 +161,92 @@ struct pci_msiq_entry {
 #define MSI_64BIT_ADDR                  0x034008UL
 #define  MSI_64BIT_ADDR_VAL             0xffffffffffff0000UL
 
-/* For now this just runs as a pre-handler for the real interrupt handler.
- * So we just walk through the queue and ACK all the entries, update the
- * head pointer, and return.
- *
- * In the longer term it would be nice to do something more integrated
- * wherein we can pass in some of this MSI info to the drivers.  This
- * would be most useful for PCIe fabric error messages, although we could
- * invoke those directly from the loop here in order to pass the info around.
- */
-static void pci_msi_prehandler(unsigned int ino, void *data1, void *data2)
+static int pci_fire_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
+                             unsigned long *head)
+{
+        *head = fire_read(pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
+        return 0;
+}
+
+static int pci_fire_dequeue_msi(struct pci_pbm_info *pbm, unsigned long msiqid,
+                                unsigned long *head, unsigned long *msi)
 {
-        unsigned long msiqid, orig_head, head, type_fmt, type;
-        struct pci_pbm_info *pbm = data1;
+        unsigned long type_fmt, type, msi_num;
         struct pci_msiq_entry *base, *ep;
 
-        msiqid = (unsigned long) data2;
+        base = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * 8192));
+        ep = &base[*head];
 
-        head = fire_read(pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
+        if ((ep->word0 & MSIQ_WORD0_FMT_TYPE) == 0)
+                return 0;
 
-        orig_head = head;
-        base = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * 8192));
-        ep = &base[head];
-        while ((ep->word0 & MSIQ_WORD0_FMT_TYPE) != 0) {
-                unsigned long msi_num;
-
-                type_fmt = ((ep->word0 & MSIQ_WORD0_FMT_TYPE) >>
-                            MSIQ_WORD0_FMT_TYPE_SHIFT);
-                type = (type_fmt >>3);
-                if (unlikely(type != MSIQ_TYPE_MSI32 &&
-                             type != MSIQ_TYPE_MSI64))
-                        goto bad_type;
-
-                msi_num = ((ep->word0 & MSIQ_WORD0_DATA0) >>
-                           MSIQ_WORD0_DATA0_SHIFT);
-
-                fire_write(pbm->pbm_regs + MSI_CLEAR(msi_num),
-                           MSI_CLEAR_EQWR_N);
-
-                /* Clear the entry.  */
-                ep->word0 &= ~MSIQ_WORD0_FMT_TYPE;
-
-                /* Go to next entry in ring.  */
-                head++;
-                if (head >= pbm->msiq_ent_count)
-                        head = 0;
-                ep = &base[head];
-        }
+        type_fmt = ((ep->word0 & MSIQ_WORD0_FMT_TYPE) >>
+                    MSIQ_WORD0_FMT_TYPE_SHIFT);
+        type = (type_fmt >> 3);
+        if (unlikely(type != MSIQ_TYPE_MSI32 &&
+                     type != MSIQ_TYPE_MSI64))
+                return -EINVAL;
 
-        if (likely(head != orig_head)) {
-                /* ACK entries by updating head pointer.  */
-                fire_write(pbm->pbm_regs +
-                           EVENT_QUEUE_HEAD(msiqid),
-                           head);
-        }
-        return;
+        *msi = msi_num = ((ep->word0 & MSIQ_WORD0_DATA0) >>
+                          MSIQ_WORD0_DATA0_SHIFT);
 
-bad_type:
-        printk(KERN_EMERG "MSI: Entry has bad type %lx\n", type);
-        return;
+        fire_write(pbm->pbm_regs + MSI_CLEAR(msi_num),
+                   MSI_CLEAR_EQWR_N);
+
+        /* Clear the entry.  */
+        ep->word0 &= ~MSIQ_WORD0_FMT_TYPE;
+
+        /* Go to next entry in ring.  */
+        (*head)++;
+        if (*head >= pbm->msiq_ent_count)
+                *head = 0;
+
+        return 1;
 }
 
-static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
+static int pci_fire_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
+                             unsigned long head)
 {
-        unsigned long size, bits_per_ulong;
+        fire_write(pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid), head);
+        return 0;
+}
 
-        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));
+static int pci_fire_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
+                              unsigned long msi, int is_msi64)
+{
+        u64 val;
 
-        pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
-        if (!pbm->msi_bitmap)
-                return -ENOMEM;
+        val = fire_read(pbm->pbm_regs + MSI_MAP(msi));
+        val &= ~(MSI_MAP_EQNUM);
+        val |= msiqid;
+        fire_write(pbm->pbm_regs + MSI_MAP(msi), val);
+
+        fire_write(pbm->pbm_regs + MSI_CLEAR(msi),
+                   MSI_CLEAR_EQWR_N);
+
+        val = fire_read(pbm->pbm_regs + MSI_MAP(msi));
+        val |= MSI_MAP_VALID;
+        fire_write(pbm->pbm_regs + MSI_MAP(msi), val);
 
         return 0;
 }
 
-static void msi_bitmap_free(struct pci_pbm_info *pbm)
+static int pci_fire_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
 {
-        kfree(pbm->msi_bitmap);
-        pbm->msi_bitmap = NULL;
+        unsigned long msiqid;
+        u64 val;
+
+        val = fire_read(pbm->pbm_regs + MSI_MAP(msi));
+        msiqid = (val & MSI_MAP_EQNUM);
+
+        val &= ~MSI_MAP_VALID;
+
+        fire_write(pbm->pbm_regs + MSI_MAP(msi), val);
+
+        return 0;
 }
 
-static int msi_queue_alloc(struct pci_pbm_info *pbm)
+static int pci_fire_msiq_alloc(struct pci_pbm_info *pbm)
 {
         unsigned long pages, order, i;
 
@@ -279,241 +281,65 @@ static int msi_queue_alloc(struct pci_pbm_info *pbm)
         return 0;
 }
 
-static int alloc_msi(struct pci_pbm_info *pbm)
+static void pci_fire_msiq_free(struct pci_pbm_info *pbm)
 {
-        int i;
+        unsigned long pages, order;
 
-        for (i = 0; i < pbm->msi_num; i++) {
-                if (!test_and_set_bit(i, pbm->msi_bitmap))
-                        return i + pbm->msi_first;
-        }
+        order = get_order(512 * 1024);
+        pages = (unsigned long) pbm->msi_queues;
 
-        return -ENOENT;
-}
+        free_pages(pages, order);
 
-static void free_msi(struct pci_pbm_info *pbm, int msi_num)
-{
-        msi_num -= pbm->msi_first;
-        clear_bit(msi_num, pbm->msi_bitmap);
+        pbm->msi_queues = NULL;
 }
 
-static int pci_setup_msi_irq(unsigned int *virt_irq_p,
-                             struct pci_dev *pdev,
-                             struct msi_desc *entry)
+static int pci_fire_msiq_build_irq(struct pci_pbm_info *pbm,
+                                   unsigned long msiqid,
+                                   unsigned long devino)
 {
-        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
-        unsigned long devino, msiqid, cregs, imap_off;
-        struct msi_msg msg;
-        int msi_num, err;
+        unsigned long cregs = (unsigned long) pbm->pbm_regs;
+        unsigned long imap_reg, iclr_reg, int_ctrlr;
+        unsigned int virt_irq;
+        int fixup;
         u64 val;
 
-        *virt_irq_p = 0;
-
-        msi_num = alloc_msi(pbm);
-        if (msi_num < 0)
-                return msi_num;
-
-        cregs = (unsigned long) pbm->pbm_regs;
+        imap_reg = cregs + (0x001000UL + (devino * 0x08UL));
+        iclr_reg = cregs + (0x001400UL + (devino * 0x08UL));
 
-        err = sun4u_build_msi(pbm->portid, virt_irq_p,
-                              pbm->msiq_first_devino,
-                              (pbm->msiq_first_devino +
-                               pbm->msiq_num),
-                              cregs + 0x001000UL,
-                              cregs + 0x001400UL);
-        if (err < 0)
-                goto out_err;
-        devino = err;
+        /* XXX iterate amongst the 4 IRQ controllers XXX */
+        int_ctrlr = (1UL << 6);
 
-        imap_off = 0x001000UL + (devino * 0x8UL);
+        val = fire_read(imap_reg);
+        val |= (1UL << 63) | int_ctrlr;
+        fire_write(imap_reg, val);
 
-        val = fire_read(pbm->pbm_regs + imap_off);
-        val |= (1UL << 63) | (1UL << 6);
-        fire_write(pbm->pbm_regs + imap_off, val);
+        fixup = ((pbm->portid << 6) | devino) - int_ctrlr;
 
-        msiqid = ((devino - pbm->msiq_first_devino) +
-                  pbm->msiq_first);
+        virt_irq = build_irq(fixup, iclr_reg, imap_reg);
+        if (!virt_irq)
+                return -ENOMEM;
 
         fire_write(pbm->pbm_regs +
                    EVENT_QUEUE_CONTROL_SET(msiqid),
                    EVENT_QUEUE_CONTROL_SET_EN);
 
-        val = fire_read(pbm->pbm_regs + MSI_MAP(msi_num));
-        val &= ~(MSI_MAP_EQNUM);
-        val |= msiqid;
-        fire_write(pbm->pbm_regs + MSI_MAP(msi_num), val);
-
-        fire_write(pbm->pbm_regs + MSI_CLEAR(msi_num),
-                   MSI_CLEAR_EQWR_N);
-
-        val = fire_read(pbm->pbm_regs + MSI_MAP(msi_num));
-        val |= MSI_MAP_VALID;
-        fire_write(pbm->pbm_regs + MSI_MAP(msi_num), val);
-
-        sparc64_set_msi(*virt_irq_p, msi_num);
-
-        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_num;
-
-        set_irq_msi(*virt_irq_p, entry);
-        write_msi_msg(*virt_irq_p, &msg);
-
-        irq_install_pre_handler(*virt_irq_p,
-                                pci_msi_prehandler,
-                                pbm, (void *) msiqid);
-
-        return 0;
-
-out_err:
-        free_msi(pbm, msi_num);
-        return err;
+        return virt_irq;
 }
 
-static void pci_teardown_msi_irq(unsigned int virt_irq,
-                                 struct pci_dev *pdev)
-{
-        struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
-        unsigned long msiqid, msi_num;
-        u64 val;
-
-        msi_num = sparc64_get_msi(virt_irq);
-
-        val = fire_read(pbm->pbm_regs + MSI_MAP(msi_num));
-
-        msiqid = (val & MSI_MAP_EQNUM);
-
-        val &= ~MSI_MAP_VALID;
-        fire_write(pbm->pbm_regs + MSI_MAP(msi_num), val);
-
-        fire_write(pbm->pbm_regs + EVENT_QUEUE_CONTROL_CLEAR(msiqid),
-                   EVENT_QUEUE_CONTROL_CLEAR_DIS);
-
-        free_msi(pbm, msi_num);
-
-        /* The sun4u_destroy_msi() will liberate the devino and thus the MSIQ
-         * allocation.
-         */
-        sun4u_destroy_msi(virt_irq);
-}
+static const struct sparc64_msiq_ops pci_fire_msiq_ops = {
+        .get_head       =       pci_fire_get_head,
+        .dequeue_msi    =       pci_fire_dequeue_msi,
+        .set_head       =       pci_fire_set_head,
+        .msi_setup      =       pci_fire_msi_setup,
+        .msi_teardown   =       pci_fire_msi_teardown,
+        .msiq_alloc     =       pci_fire_msiq_alloc,
+        .msiq_free      =       pci_fire_msiq_free,
+        .msiq_build_irq =       pci_fire_msiq_build_irq,
+};
 
 static void pci_fire_msi_init(struct pci_pbm_info *pbm)
 {
-        const u32 *val;
-        int len;
-
-        val = of_get_property(pbm->prom_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->prom_node, "msi-eq-size", &len);
-                if (!val || len != 4)
-                        goto no_msi;
-
-                pbm->msiq_ent_count = *val;
-
-                mqp = of_get_property(pbm->prom_node,
-                                      "msi-eq-to-devino", &len);
-                if (!mqp)
-                        mqp = of_get_property(pbm->prom_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->prom_node, "#msi", &len);
-                if (!val || len != 4)
-                        goto no_msi;
-                pbm->msi_num = *val;
-
-                mrng = of_get_property(pbm->prom_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->prom_node, "msi-data-mask", &len);
-                if (!val || len != 4)
-                        goto no_msi;
-                pbm->msi_data_mask = *val;
-
-                val = of_get_property(pbm->prom_node, "msix-data-width", &len);
-                if (!val || len != 4)
-                        goto no_msi;
-                pbm->msix_data_width = *val;
-
-                arng = of_get_property(pbm->prom_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_queue_alloc(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->setup_msi_irq = pci_setup_msi_irq;
-        pbm->teardown_msi_irq = pci_teardown_msi_irq;
-
-        return;
-
-no_msi:
-        pbm->msiq_num = 0;
-        printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
+        sparc64_pbm_msi_init(pbm, &pci_fire_msiq_ops);
 }
 #else /* CONFIG_PCI_MSI */
 static void pci_fire_msi_init(struct pci_pbm_info *pbm)