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ACPI-related fixes for arm64: 

- GICC MADT entry validity check fix
 
 - Skip IRQ registration with pmu=off in an ACPI guest
 
 - struct acpi_pci_root_ops freeing on error path
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:
 "ACPI-related fixes for arm64:

   - GICC MADT entry validity check fix

   - Skip IRQ registration with pmu=off in an ACPI guest

   - struct acpi_pci_root_ops freeing on error path"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  ARM64/ACPI: Fix BAD_MADT_GICC_ENTRY() macro implementation
  drivers/perf: arm_pmu_acpi: avoid perf IRQ init when guest PMU is off
  ARM64: PCI: Fix struct acpi_pci_root_ops allocation failure path
hifive-unleashed-5.1
Linus Torvalds 2017-06-02 12:06:27 -07:00
parent 65d03328aa cb7cf772d8
commit b939c51445
3 changed files with 17 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm64/include/asm/acpi.h
View File

@ -23,9 +23,9 @@
#define ACPI_MADT_GICC_LENGTH \
(acpi_gbl_FADT.header.revision < 6 ? 76 : 80)
#define BAD_MADT_GICC_ENTRY(entry, end) \
(!(entry) || (unsigned long)(entry) + sizeof(*(entry)) > (end) || \
(entry)->header.length != ACPI_MADT_GICC_LENGTH)
#define BAD_MADT_GICC_ENTRY(entry, end) \
(!(entry) || (entry)->header.length != ACPI_MADT_GICC_LENGTH || \
(unsigned long)(entry) + ACPI_MADT_GICC_LENGTH > (end))
/* Basic configuration for ACPI */
#ifdef CONFIG_ACPI

4
arch/arm64/kernel/pci.c
View File

@ -191,8 +191,10 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
return NULL;
root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node);
if (!root_ops)
if (!root_ops) {
kfree(ri);
return NULL;
}
ri->cfg = pci_acpi_setup_ecam_mapping(root);
if (!ri->cfg) {

11
drivers/perf/arm_pmu_acpi.c
View File

@ -29,6 +29,17 @@ static int arm_pmu_acpi_register_irq(int cpu)
return -EINVAL;
gsi = gicc->performance_interrupt;
/*
* Per the ACPI spec, the MADT cannot describe a PMU that doesn't
* have an interrupt. QEMU advertises this by using a GSI of zero,
* which is not known to be valid on any hardware despite being
* valid per the spec. Take the pragmatic approach and reject a
* GSI of zero for now.
*/
if (!gsi)
return 0;
if (gicc->flags & ACPI_MADT_PERFORMANCE_IRQ_MODE)
trigger = ACPI_EDGE_SENSITIVE;
else