diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm4x-core.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-core.c | 55 |
1 files changed, 45 insertions, 10 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index dd8c74f893db..2c1a60577728 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -6,6 +6,7 @@ #include <linux/acpi.h> #include <linux/bitops.h> #include <linux/kernel.h> +#include <linux/kvm_host.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/types.h> @@ -268,10 +269,28 @@ struct etm4_enable_arg { */ static void etm4x_prohibit_trace(struct etmv4_drvdata *drvdata) { + u64 trfcr; + /* If the CPU doesn't support FEAT_TRF, nothing to do */ if (!drvdata->trfcr) return; - cpu_prohibit_trace(); + + trfcr = drvdata->trfcr & ~(TRFCR_EL1_ExTRE | TRFCR_EL1_E0TRE); + + write_trfcr(trfcr); + kvm_tracing_set_el1_configuration(trfcr); +} + +static u64 etm4x_get_kern_user_filter(struct etmv4_drvdata *drvdata) +{ + u64 trfcr = drvdata->trfcr; + + if (drvdata->config.mode & ETM_MODE_EXCL_KERN) + trfcr &= ~TRFCR_EL1_ExTRE; + if (drvdata->config.mode & ETM_MODE_EXCL_USER) + trfcr &= ~TRFCR_EL1_E0TRE; + + return trfcr; } /* @@ -286,18 +305,28 @@ static void etm4x_prohibit_trace(struct etmv4_drvdata *drvdata) */ static void etm4x_allow_trace(struct etmv4_drvdata *drvdata) { - u64 trfcr = drvdata->trfcr; + u64 trfcr, guest_trfcr; /* If the CPU doesn't support FEAT_TRF, nothing to do */ - if (!trfcr) + if (!drvdata->trfcr) return; - if (drvdata->config.mode & ETM_MODE_EXCL_KERN) - trfcr &= ~TRFCR_ELx_ExTRE; - if (drvdata->config.mode & ETM_MODE_EXCL_USER) - trfcr &= ~TRFCR_ELx_E0TRE; + if (drvdata->config.mode & ETM_MODE_EXCL_HOST) + trfcr = drvdata->trfcr & ~(TRFCR_EL1_ExTRE | TRFCR_EL1_E0TRE); + else + trfcr = etm4x_get_kern_user_filter(drvdata); write_trfcr(trfcr); + + /* Set filters for guests and pass to KVM */ + if (drvdata->config.mode & ETM_MODE_EXCL_GUEST) + guest_trfcr = drvdata->trfcr & ~(TRFCR_EL1_ExTRE | TRFCR_EL1_E0TRE); + else + guest_trfcr = etm4x_get_kern_user_filter(drvdata); + + /* TRFCR_EL1 doesn't have CX so mask it out. */ + guest_trfcr &= ~TRFCR_EL2_CX; + kvm_tracing_set_el1_configuration(guest_trfcr); } #ifdef CONFIG_ETM4X_IMPDEF_FEATURE @@ -655,6 +684,12 @@ static int etm4_parse_event_config(struct coresight_device *csdev, if (attr->exclude_user) config->mode = ETM_MODE_EXCL_USER; + if (attr->exclude_host) + config->mode |= ETM_MODE_EXCL_HOST; + + if (attr->exclude_guest) + config->mode |= ETM_MODE_EXCL_GUEST; + /* Always start from the default config */ etm4_set_default_config(config); @@ -1141,9 +1176,9 @@ static void cpu_detect_trace_filtering(struct etmv4_drvdata *drvdata) * tracing at the kernel EL and EL0, forcing to use the * virtual time as the timestamp. */ - trfcr = (TRFCR_ELx_TS_VIRTUAL | - TRFCR_ELx_ExTRE | - TRFCR_ELx_E0TRE); + trfcr = (TRFCR_EL1_TS_VIRTUAL | + TRFCR_EL1_ExTRE | + TRFCR_EL1_E0TRE); /* If we are running at EL2, allow tracing the CONTEXTIDR_EL2. */ if (is_kernel_in_hyp_mode()) |