powerpc/powerpc: Add new PCIe functions for allocating cxl interrupts

This adds a number of functions for allocating IRQs under powernv PCIe for cxl.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 185 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/pnv-pci.h b/arch/powerpc/include/asm/pnv-pci.h
new file mode 100644
index 000000000000..f09a22fa1bd7
--- /dev/null
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 IBM Corp.
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_PNV_PCI_H
+#define _ASM_PNV_PCI_H
+
+#include <linux/pci.h>
+#include <misc/cxl.h>
+
+int pnv_phb_to_cxl(struct pci_dev *dev);
+int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
+                           unsigned int virq);
+int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num);
+void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num);
+int pnv_cxl_get_irq_count(struct pci_dev *dev);
+struct device_node *pnv_pci_to_phb_node(struct pci_dev *dev);
+
+#ifdef CONFIG_CXL_BASE
+int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
+                               struct pci_dev *dev, int num);
+void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
+                                  struct pci_dev *dev);
+#endif
+
+#endif
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 56abb5240995..468a0f23c7f2 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -37,6 +37,9 @@
 #include <asm/xics.h>
 #include <asm/debug.h>
 #include <asm/firmware.h>
+#include <asm/pnv-pci.h>
+
+#include <misc/cxl.h>
 
 #include "powernv.h"
 #include "pci.h"
@@ -1350,6 +1353,157 @@ static void set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq)
         irq_set_chip(virq, &phb->ioda.irq_chip);
 }
 
+#ifdef CONFIG_CXL_BASE
+
+struct device_node *pnv_pci_to_phb_node(struct pci_dev *dev)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+
+        return hose->dn;
+}
+EXPORT_SYMBOL(pnv_pci_to_phb_node);
+
+int pnv_phb_to_cxl(struct pci_dev *dev)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+        struct pnv_ioda_pe *pe;
+        int rc;
+
+        pe = pnv_ioda_get_pe(dev);
+        if (!pe)
+                return -ENODEV;
+
+        pe_info(pe, "Switching PHB to CXL\n");
+
+        rc = opal_pci_set_phb_cxl_mode(phb->opal_id, 1, pe->pe_number);
+        if (rc)
+                dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);
+
+        return rc;
+}
+EXPORT_SYMBOL(pnv_phb_to_cxl);
+
+/* Find PHB for cxl dev and allocate MSI hwirqs?
+ * Returns the absolute hardware IRQ number
+ */
+int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+        int hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, num);
+
+        if (hwirq < 0) {
+                dev_warn(&dev->dev, "Failed to find a free MSI\n");
+                return -ENOSPC;
+        }
+
+        return phb->msi_base + hwirq;
+}
+EXPORT_SYMBOL(pnv_cxl_alloc_hwirqs);
+
+void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+
+        msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, num);
+}
+EXPORT_SYMBOL(pnv_cxl_release_hwirqs);
+
+void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
+                                  struct pci_dev *dev)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+        int i, hwirq;
+
+        for (i = 1; i < CXL_IRQ_RANGES; i++) {
+                if (!irqs->range[i])
+                        continue;
+                pr_devel("cxl release irq range 0x%x: offset: 0x%lx  limit: %ld\n",
+                         i, irqs->offset[i],
+                         irqs->range[i]);
+                hwirq = irqs->offset[i] - phb->msi_base;
+                msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
+                                       irqs->range[i]);
+        }
+}
+EXPORT_SYMBOL(pnv_cxl_release_hwirq_ranges);
+
+int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
+                               struct pci_dev *dev, int num)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+        int i, hwirq, try;
+
+        memset(irqs, 0, sizeof(struct cxl_irq_ranges));
+
+        /* 0 is reserved for the multiplexed PSL DSI interrupt */
+        for (i = 1; i < CXL_IRQ_RANGES && num; i++) {
+                try = num;
+                while (try) {
+                        hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, try);
+                        if (hwirq >= 0)
+                                break;
+                        try /= 2;
+                }
+                if (!try)
+                        goto fail;
+
+                irqs->offset[i] = phb->msi_base + hwirq;
+                irqs->range[i] = try;
+                pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx  limit: %li\n",
+                         i, irqs->offset[i], irqs->range[i]);
+                num -= try;
+        }
+        if (num)
+                goto fail;
+
+        return 0;
+fail:
+        pnv_cxl_release_hwirq_ranges(irqs, dev);
+        return -ENOSPC;
+}
+EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);
+
+int pnv_cxl_get_irq_count(struct pci_dev *dev)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+
+        return phb->msi_bmp.irq_count;
+}
+EXPORT_SYMBOL(pnv_cxl_get_irq_count);
+
+int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
+                           unsigned int virq)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        struct pnv_phb *phb = hose->private_data;
+        unsigned int xive_num = hwirq - phb->msi_base;
+        struct pnv_ioda_pe *pe;
+        int rc;
+
+        if (!(pe = pnv_ioda_get_pe(dev)))
+                return -ENODEV;
+
+        /* Assign XIVE to PE */
+        rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
+        if (rc) {
+                pe_warn(pe, "%s: OPAL error %d setting msi_base 0x%x "
+                        "hwirq 0x%x XIVE 0x%x PE\n",
+                        pci_name(dev), rc, phb->msi_base, hwirq, xive_num);
+                return -EIO;
+        }
+        set_msi_irq_chip(phb, virq);
+
+        return 0;
+}
+EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
+#endif
+
 static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
                                   unsigned int hwirq, unsigned int virq,
                                   unsigned int is_64, struct msi_msg *msg)