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authorTyler Baicar <tbaicar@codeaurora.org>2017-06-21 12:17:09 -0600
committerWill Deacon <will.deacon@arm.com>2017-06-22 18:22:03 +0100
commit7edda0886bc3d1e5418951558a2555af1bc73b0a (patch)
tree1667db61f5bb8f8cd3bf87c7fb1cc68d11224597 /arch/arm64/mm
parentarm64: exception: handle Synchronous External Abort (diff)
downloadlinux-dev-7edda0886bc3d1e5418951558a2555af1bc73b0a.tar.xz
linux-dev-7edda0886bc3d1e5418951558a2555af1bc73b0a.zip
acpi: apei: handle SEA notification type for ARMv8
ARM APEI extension proposal added SEA (Synchronous External Abort) notification type for ARMv8. Add a new GHES error source handling function for SEA. If an error source's notification type is SEA, then this function can be registered into the SEA exception handler. That way GHES will parse and report SEA exceptions when they occur. An SEA can interrupt code that had interrupts masked and is treated as an NMI. To aid this the page of address space for mapping APEI buffers while in_nmi() is always reserved, and ghes_ioremap_pfn_nmi() is changed to use the helper methods to find the prot_t to map with in the same way as ghes_ioremap_pfn_irq(). Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org> Reviewed-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r--arch/arm64/mm/fault.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 246e64f60610..07481af15fd7 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -42,6 +42,8 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
+#include <acpi/ghes.h>
+
struct fault_info {
int (*fn)(unsigned long addr, unsigned int esr,
struct pt_regs *regs);
@@ -535,6 +537,21 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
inf->name, esr, addr);
+ /*
+ * Synchronous aborts may interrupt code which had interrupts masked.
+ * Before calling out into the wider kernel tell the interested
+ * subsystems.
+ */
+ if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+ if (interrupts_enabled(regs))
+ nmi_enter();
+
+ ghes_notify_sea();
+
+ if (interrupts_enabled(regs))
+ nmi_exit();
+ }
+
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = 0;