From: Suravee Suthikulpanit <[email protected]> Adding amd_iommu_log command line option to allow "default", "verbose" and "debug" IOMMU error logging level in kernel log.
Signed-off-by: Suravee Suthikulpanit <[email protected]> --- Documentation/kernel-parameters.txt | 10 ++++++++++ drivers/iommu/amd_iommu_init.c | 17 +++++++++++++++++ drivers/iommu/amd_iommu_types.h | 6 ++++++ 3 files changed, 33 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index c3bfacb..752f0f9 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -350,6 +350,16 @@ bytes respectively. Such letter suffixes can also be entirely omitted. driver will print ACPI tables for AMD IOMMU during IOMMU initialization. + amd_iommu_log= [HW,X86-64] + Specify parametes to choose the logging level. By default + the AMD IOMMU minimizes the logging detail, filters + duplicate log entries and suppress logging when encounters + storm of interrupts from a particular device. + Available options are: + default - Default log level. + verbose - Output detail log messages. + debug - Output detail log messages and no filter/suppress. + amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: <a>,<b> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index bf51abb..66e3722 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -157,6 +157,8 @@ bool amd_iommu_v2_present __read_mostly; bool amd_iommu_force_isolation __read_mostly; +int amd_iommu_log_level __read_mostly = AMD_IOMMU_LOG_DEFAULT; + /* * List of protection domains - used during resume */ @@ -2157,6 +2159,20 @@ static int __init parse_amd_iommu_options(char *str) return 1; } +static int __init parse_amd_iommu_log(char *str) +{ + for (; *str; ++str) { + if (strncmp(str, "default", 7) == 0) + amd_iommu_log_level = AMD_IOMMU_LOG_DEFAULT; + else if (strncmp(str, "verbose", 7) == 0) + amd_iommu_log_level = AMD_IOMMU_LOG_VERBOSE; + else if (strncmp(str, "debug", 5) == 0) + amd_iommu_log_level = AMD_IOMMU_LOG_DEBUG; + } + + return 1; +} + static int __init parse_ivrs_ioapic(char *str) { unsigned int bus, dev, fn; @@ -2219,6 +2235,7 @@ static int __init parse_ivrs_hpet(char *str) __setup("amd_iommu_dump", parse_amd_iommu_dump); __setup("amd_iommu=", parse_amd_iommu_options); +__setup("amd_iommu_log=", parse_amd_iommu_log); __setup("ivrs_ioapic", parse_ivrs_ioapic); __setup("ivrs_hpet", parse_ivrs_hpet); diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index 0285a21..85b7a65 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -694,6 +694,12 @@ extern bool amd_iommu_v2_present; extern bool amd_iommu_force_isolation; +#define AMD_IOMMU_LOG_DEFAULT 0 +#define AMD_IOMMU_LOG_VERBOSE 1 +#define AMD_IOMMU_LOG_DEBUG 2 + +extern int amd_iommu_log_level; + /* Max levels of glxval supported */ extern int amd_iommu_max_glx_val; -- 1.7.10.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
