This patch contains a function to print the hardware registers of each
IOMMU onto the system console during crashdump kernel initialization.
This function seemed far too useful to leave out.
v1->v2:
Updated patch description
Fixed: "Advanced Fault Log register"
Signed-off-by: Bill Sumner <bill.sumner at hp.com>
---
drivers/iommu/intel-iommu.c | 76 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 9d2398b..3b357e2 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5324,3 +5324,79 @@ static int copy_intel_iommu_translation_tables(struct dmar_drhd_unit *drhd,
return 0;
}
#endif /* CONFIG_CRASH_DUMP */
+#ifdef CONFIG_CRASH_DUMP
+
+
+/* =========================================================================
+ * Diagnostic print
+ * ------------------------------------------------------------------------
+ */
+
+static struct intel_iommu_register_print {
+ int len; /* Length of register */
+ int idx; /* Index to read register */
+ char reg[20]; /* Linux name of register */
+ char txt[40]; /* Description */
+} intel_iommu_register_print_v[] = {
+ {1, DMAR_VER_REG, "DMAR_VER_REG", "Arch version supported by this IOMMU"},
+ {2, DMAR_CAP_REG, "DMAR_CAP_REG", "Hardware supported capabilities"},
+ {2, DMAR_ECAP_REG, "DMAR_ECAP_REG", "Extended capabilities supported"},
+ {1, DMAR_GCMD_REG, "DMAR_GCMD_REG", "Global command register"},
+ {1, DMAR_GSTS_REG, "DMAR_GSTS_REG", "Global status register "},
+ {2, DMAR_RTADDR_REG, "DMAR_RTADDR_REG", "Root entry table"},
+ {2, DMAR_CCMD_REG, "DMAR_CCMD_REG", "Context command reg"},
+ {1, DMAR_FSTS_REG, "DMAR_FSTS_REG", "Fault Status register"},
+ {1, DMAR_FECTL_REG, "DMAR_FECTL_REG", "Fault control register"},
+ {1, DMAR_FEDATA_REG, "DMAR_FEDATA_REG", "Fault event interrupt data register"},
+ {1, DMAR_FEADDR_REG, "DMAR_FEADDR_REG", "Fault event interrupt addr register"},
+ {1, DMAR_FEUADDR_REG, "DMAR_FEUADDR_REG", "Upper address register"},
+ {2, DMAR_AFLOG_REG, "DMAR_AFLOG_REG", "Advanced Fault Log register"},
+ {1, DMAR_PMEN_REG, "DMAR_PMEN_REG", "Enable Protected Memory Region"},
+ {1, DMAR_PLMBASE_REG, "DMAR_PLMBASE_REG", "PMRR Low addr"},
+ {1, DMAR_PLMLIMIT_REG, "DMAR_PLMLIMIT_REG", "PMRR low limit"},
+ {2, DMAR_PHMBASE_REG, "DMAR_PHMBASE_REG", "pmrr high base addr"},
+ {2, DMAR_PHMLIMIT_REG, "DMAR_PHMLIMIT_REG", "pmrr high limit"},
+ {2, DMAR_IQH_REG, "DMAR_IQH_REG", "Invalidation queue head register"},
+ {2, DMAR_IQT_REG, "DMAR_IQT_REG", "Invalidation queue tail register"},
+ {2, DMAR_IQA_REG, "DMAR_IQA_REG", "Invalidation queue addr register"},
+ {1, DMAR_ICS_REG, "DMAR_ICS_REG", "Invalidation complete status register"},
+ {2, DMAR_IRTA_REG, "DMAR_IRTA_REG", "Interrupt remapping table addr register"},
+};
+
+static void print_intel_iommu_registers(struct dmar_drhd_unit *drhd)
+{
+ struct intel_iommu *iommu; /* Virt adr(iommu hardware registers) */
+ unsigned long long q; /* quadword scratch */
+ u32 ver; /* DMAR_VER_REG */
+
+ int m = sizeof(intel_iommu_register_print_v) /
+ sizeof(intel_iommu_register_print_v[0]);
+ struct intel_iommu_register_print *p = &intel_iommu_register_print_v[0];
+
+ iommu = drhd->iommu;
+
+ pr_debug("ENTER %s\n", __func__);
+ ver = readl(iommu->reg + DMAR_VER_REG);
+ pr_debug("IOMMU %d: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n",
+ iommu->seq_id,
+ (unsigned long long)drhd->reg_base_addr,
+ DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
+ (unsigned long long)iommu->cap,
+ (unsigned long long)iommu->ecap);
+
+ q = readq(iommu->reg + DMAR_RTADDR_REG);
+ pr_debug("IOMMU %d: DMAR_RTADDR_REG:0x%16.16llx\n", iommu->seq_id, q);
+
+ for (; p < &intel_iommu_register_print_v[m]; p++)
+ if (p->len == 2)
+ pr_debug("0x%16.16llx %-20s %-40s\n",
+ (u64)readq(iommu->reg + p->idx), p->reg,
+ p->txt);
+ else
+ pr_debug(" 0x%8.8x %-20s %-40s\n",
+ (u32)readl(iommu->reg + p->idx), p->reg,
+ p->txt);
+
+ pr_debug("LEAVE %s\n", __func__);
+}
+#endif /* CONFIG_CRASH_DUMP */
--
Bill Sumner <bill.sumner at hp.com>
