Attachment 160529 Details for Bug 250611 – simple patch to panic when an error occurs on PCIe

[patch] simple patch to panic when an error occurs on PCIe

cell-pcie-aer.diff (text/plain), 5.10 KB, created by Robbie Williamson on 2007-08-02 15:07:34 UTC

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Creator: Robbie Williamson

Created: 2007-08-02 15:07:34 UTC

Size: 5.10 KB

patch

obsolete

>Index: linux-2.6.22/arch/powerpc/platforms/cell/Kconfig
>===================================================================
>--- linux-2.6.22.orig/arch/powerpc/platforms/cell/Kconfig
>+++ linux-2.6.22/arch/powerpc/platforms/cell/Kconfig
>@@ -83,4 +83,11 @@ config CBE_CPUFREQ_PMI
> 	  processor will not only be able to run at lower speed,
> 	  but also at lower core voltage.
> 
>+config CBE_AXON_UTL
>+	bool "CBE/Axon PCIe Upper Transaction layer error handling"
>+	default n
>+	help
>+	  The Axon chip delivers error conditions detected in the
>+	  PCIe root complex as interrupts.
>+
> endmenu
>Index: linux-2.6.22/arch/powerpc/platforms/cell/Makefile
>===================================================================
>--- linux-2.6.22.orig/arch/powerpc/platforms/cell/Makefile
>+++ linux-2.6.22/arch/powerpc/platforms/cell/Makefile
>@@ -8,6 +8,8 @@ obj-$(CONFIG_CBE_CPUFREQ_PMI)		+= cbe_cp
> obj-$(CONFIG_CBE_CPUFREQ)		+= cbe-cpufreq.o
> cbe-cpufreq-y				+= cbe_cpufreq_pervasive.o cbe_cpufreq.o
> 
>+obj-$(CONFIG_CBE_AXON_UTL)		+= axon_utl.o
>+
> ifeq ($(CONFIG_SMP),y)
> obj-$(CONFIG_PPC_CELL_NATIVE)		+= smp.o
> endif
>Index: linux-2.6.22/arch/powerpc/platforms/cell/axon_utl.c
>===================================================================
>--- /dev/null
>+++ linux-2.6.22/arch/powerpc/platforms/cell/axon_utl.c
>@@ -0,0 +1,159 @@
>+/*
>+ * PCIe error reporting handler for Axon
>+ *
>+ * (C) Copyright IBM Corp. 2007
>+ *
>+ * Authors : Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
>+ *
>+ * This program is free software; you can redistribute it and/or modify
>+ * it under the terms of the GNU General Public License version 2 as
>+ * published by the Free Software Foundation.
>+ *
>+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
>+ */
>+
>+#include <linux/interrupt.h>
>+#include <linux/irq.h>
>+#include <linux/kernel.h>
>+#include <linux/pci.h>
>+#include <linux/msi.h>
>+#include <linux/reboot.h>
>+
>+#include <asm/machdep.h>
>+#include <asm/prom.h>
>+
>+
>+/*
>+ * Axon UTL registers
>+ */
>+#define AXON_UTL_STATUS			0x04
>+#define AXON_UTL_PCIE_PORT_STATUS	0xa4
>+#define AXON_UTL_PCIE_PORT_CMPLX_STATUS	0xb0
>+
>+struct axon_utl {
>+	struct device_node *dn;
>+	void __iomem *base;
>+	int virq;
>+};
>+
>+static u32 axon_utl_read(struct axon_utl *axon_utl, unsigned int reg)
>+{
>+	return in_be32(axon_utl->base + reg);
>+}
>+
>+static void axon_utl_dump_registers(struct axon_utl *axon_utl)
>+{
>+	printk("\naxon_utl: AXON_UTL_STATUS = 0x%08x\n",
>+	       axon_utl_read(axon_utl, AXON_UTL_STATUS));
>+
>+	printk("axon_utl: AXON_UTL_PCIE_PORT_STATUS = 0x%08x\n",
>+	       axon_utl_read(axon_utl, AXON_UTL_PCIE_PORT_STATUS));
>+
>+	printk("axon_utl: AXON_UTL_PCIE_ROOT_CMPLX_STATUS = 0x%08x\n",
>+	       axon_utl_read(axon_utl, AXON_UTL_PCIE_PORT_CMPLX_STATUS));
>+}
>+
>+static irqreturn_t axon_utl_interrupt(int irq, void *ptr)
>+{
>+	struct axon_utl *axon_utl = (struct axon_utl *) ptr;
>+
>+	axon_utl_dump_registers(axon_utl);
>+
>+	panic("\naxon_utl: an unrecoverable error on PCIe node %s occured !\n",
>+	      axon_utl->dn->full_name);
>+
>+	/* should never happen */
>+	return IRQ_HANDLED;
>+}
>+
>+static int axon_utl_setup_one(struct device_node *dn)
>+{
>+	int ret, virq;
>+	unsigned int flags;
>+	struct axon_utl *axon_utl;
>+	const u32 *addr;
>+	u64 ioaddr, size;
>+
>+	pr_debug("axon_utl: setting up dn %s\n", dn->full_name);
>+
>+	axon_utl = kzalloc(sizeof(struct axon_utl), GFP_KERNEL);
>+	if (!axon_utl) {
>+		printk(KERN_ERR "axon_utl: could not allocate axon_utl for %s\n",
>+		       dn->full_name);
>+		goto out;
>+	}
>+
>+	axon_utl->dn = dn;
>+
>+	addr = of_get_address(dn, 0, &size, &flags);
>+
>+	if (addr == 0) {
>+		printk(KERN_ERR "axon_utl: addr of resource is 0\n");
>+		goto out_free;
>+	}
>+
>+	if (size == 0) {
>+		printk(KERN_ERR "axon_utl: length of resource is 0\n");
>+		goto out_free;
>+	}
>+
>+	ioaddr = of_translate_address(dn, addr);
>+
>+	axon_utl->base = ioremap(ioaddr, size);
>+
>+	if (axon_utl->base == NULL) {
>+		printk(KERN_ERR "axon_utl: unable to ioremap io address\n");
>+		goto out_free;
>+	}
>+
>+	virq = irq_of_parse_and_map(dn, 0);
>+	if (virq == NO_IRQ) {
>+		printk(KERN_ERR "axon_utl: irq parse and map failed for %s\n",
>+		       dn->full_name);
>+		goto out_free;
>+	}
>+
>+	ret = request_irq(virq, axon_utl_interrupt,
>+			IRQF_DISABLED, "axon_utl", axon_utl);
>+	if (ret) {
>+		printk(KERN_ERR "axon_utl: request for irq %d on dn %s failed \n",
>+		       virq, dn->full_name);
>+		goto out_free;
>+	}
>+
>+	pr_info("axon_utl: registered error handler on irq %d for %s\n",
>+	       virq, axon_utl->dn->full_name);
>+
>+	return 0;
>+
>+out_free:
>+	kfree(axon_utl);
>+out:
>+	return -ENODEV;
>+}
>+
>+static int axon_utl_init(void)
>+{
>+	struct device_node *dn;
>+	int n=0;
>+
>+	for_each_compatible_node(dn, NULL, "ibm,axon-pciex-utl") {
>+		if (axon_utl_setup_one(dn) == 0)
>+			n++;
>+	}
>+
>+	if (n == 0) {
>+		pr_info("No pciex nodes found\n");
>+	}
>+
>+	return 0;
>+}
>+
>+subsys_initcall(axon_utl_init);

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Attachments on bug 250611: 160528 | 160529