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Message-Id: <1411028820-29933-8-git-send-email-mikey@neuling.org>
Date: Thu, 18 Sep 2014 18:26:52 +1000
From: Michael Neuling <mikey@...ling.org>
To: greg@...ah.com, arnd@...db.de, mpe@...erman.id.au,
benh@...nel.crashing.org
Cc: mikey@...ling.org, anton@...ba.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...abs.org, jk@...abs.org, imunsie@...ibm.com,
cbe-oss-dev@...ts.ozlabs.org
Subject: [PATCH 07/15] powerpc/powerpc: Add new PCIe functions for allocating cxl interrupts
From: Ian Munsie <imunsie@....ibm.com>
This adds a number of functions for allocating IRQs under powernv PCIe for cxl.
Signed-off-by: Ian Munsie <imunsie@....ibm.com>
Signed-off-by: Michael Neuling <mikey@...ling.org>
---
arch/powerpc/include/asm/pnv-pci.h | 27 +++++
arch/powerpc/platforms/powernv/pci-ioda.c | 186 ++++++++++++++++++++++++++++++
2 files changed, 213 insertions(+)
create mode 100644 arch/powerpc/include/asm/pnv-pci.h
diff --git a/arch/powerpc/include/asm/pnv-pci.h b/arch/powerpc/include/asm/pnv-pci.h
new file mode 100644
index 0000000..71717b5
--- /dev/null
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -0,0 +1,27 @@
+/*
+ * 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_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);
+int pnv_cxl_get_irq_count(struct pci_dev *dev);
+
+#endif
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 194f90a..80919f8 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -38,6 +38,8 @@
#include <asm/debug.h>
#include <asm/firmware.h>
+#include <misc/cxl.h>
+
#include "powernv.h"
#include "pci.h"
@@ -503,6 +505,163 @@ static struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
return NULL;
return &phb->ioda.pe_array[pdn->pe_number];
}
+
+struct device_node *pnv_pci_to_phb_node(struct pci_dev *dev)
+{
+ struct device_node *np;
+ struct property *prop = NULL;
+
+ np = of_node_get(pci_device_to_OF_node(dev));
+
+ /* Scan up the tree looking for the PHB node */
+ while (np) {
+ if ((prop = of_find_property(np, "ibm,opal-phbid", NULL)))
+ break;
+ np = of_get_next_parent(np);
+ }
+
+ if (!prop) {
+ of_node_put(np);
+ return NULL;
+ }
+
+ return np;
+}
+EXPORT_SYMBOL(pnv_pci_to_phb_node);
+
+#ifdef CONFIG_CXL_BASE
+int pnv_phb_to_cxl(struct pci_dev *dev)
+{
+ struct device_node *np;
+ struct pnv_ioda_pe *pe;
+ const u64 *prop64;
+ u64 phb_id;
+ int rc;
+
+ dev_info(&dev->dev, "switch PHB to CXL\n");
+
+ if (!(np = pnv_pci_to_phb_node(dev)))
+ return -ENODEV;
+
+ prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
+
+ phb_id = be64_to_cpup(prop64);
+ dev_info(&dev->dev, "PHB-ID : 0x%016llx\n", phb_id);
+
+ if (!(pe = pnv_ioda_get_pe(dev))) {
+ rc = -ENODEV;
+ goto out;
+ }
+ dev_info(&dev->dev, " pe : %i\n", pe->pe_number);
+
+ if ((rc = opal_pci_set_phb_cxl_mode(phb_id, 1, pe->pe_number)))
+ dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);
+
+out:
+ of_node_put(np);
+ return rc;
+}
+EXPORT_SYMBOL(pnv_phb_to_cxl);
+
+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);
+
+
+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 range = 0;
+ int hwirq;
+ int try;
+
+ memset(irqs, 0, sizeof(struct cxl_irq_ranges));
+
+ for (range = 1; range < CXL_IRQ_RANGES && num; range++) {
+ 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[range] = phb->msi_base + hwirq;
+ irqs->range[range] = try;
+ pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx limit: %li\n",
+ range, irqs->offset[range], irqs->range[range]);
+ num -= try;
+ }
+ if (num)
+ goto fail;
+
+ return 0;
+fail:
+ for (range--; range >= 0; range--) {
+ hwirq = irqs->offset[range] - phb->msi_base;
+ msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
+ irqs->range[range]);
+ irqs->range[range] = 0;
+ }
+ return -ENOSPC;
+}
+EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);
+
+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 range = 0;
+ int hwirq;
+
+ for (range = 0; range < 4; range++) {
+ hwirq = irqs->offset[range] - phb->msi_base;
+ if (irqs->range[range]) {
+ pr_devel("cxl release irq range 0x%x: offset: 0x%lx limit: %ld\n",
+ range, irqs->offset[range],
+ irqs->range[range]);
+ msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
+ irqs->range[range]);
+ }
+ }
+}
+EXPORT_SYMBOL(pnv_cxl_release_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);
+
+#endif /* CONFIG_CXL_BASE */
#endif /* CONFIG_PCI_MSI */
static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
@@ -1330,6 +1489,33 @@ static void set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq)
}
}
+#ifdef CONFIG_CXL_BASE
+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) {
+ pr_warn("%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)
--
1.9.1
--
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