From 9a51933e360897d9b3867c9b09dd5ccf7493e97e Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Wed, 11 May 2016 14:06:57 -0500 Subject: [PATCH] tracing: Expose CPU physical addresses (resource values) for PCI devices Previously, mmio_print_pcidev() put "user" addresses in the trace buffer. On most architectures, these are the same as CPU physical addresses, but on microblaze, mips, powerpc, and sparc, they may be something else, typically a raw BAR value (a bus address as opposed to a CPU address). Always expose the CPU physical address to avoid this arch-dependent behavior. This change should have no user-visible effect because this file currently depends on CONFIG_HAVE_MMIOTRACE_SUPPORT, which is only defined for x86, and pci_resource_to_user() is a no-op on x86. Link: http://lkml.kernel.org/r/20160511190657.5898.4248.stgit@bhelgaas-glaptop2.roam.corp.google.com Signed-off-by: Bjorn Helgaas Signed-off-by: Steven Rostedt --- kernel/trace/trace_mmiotrace.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c index 68f376ca6d3f..cd7480d0a201 100644 --- a/kernel/trace/trace_mmiotrace.c +++ b/kernel/trace/trace_mmiotrace.c @@ -68,19 +68,15 @@ static void mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev) trace_seq_printf(s, "PCIDEV %02x%02x %04x%04x %x", dev->bus->number, dev->devfn, dev->vendor, dev->device, dev->irq); - /* - * XXX: is pci_resource_to_user() appropriate, since we are - * supposed to interpret the __ioremap() phys_addr argument based on - * these printed values? - */ for (i = 0; i < 7; i++) { - pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); + start = dev->resource[i].start; trace_seq_printf(s, " %llx", (unsigned long long)(start | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); } for (i = 0; i < 7; i++) { - pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); + start = dev->resource[i].start; + end = dev->resource[i].end; trace_seq_printf(s, " %llx", dev->resource[i].start < dev->resource[i].end ? (unsigned long long)(end - start) + 1 : 0);