intel-iommu: Combine the BIOS DMAR table warning messages

We have nearly the same code for warnings repeated four times.  Move
it into a separate function.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 14 insertions, 34 deletions

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 7771b2dd597..1959cdadad5 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -618,7 +618,15 @@ int __init dmar_table_init(void)
         return 0;
 }
 
-static int bios_warned;
+static void warn_invalid_dmar(u64 addr, const char *message)
+{
+        WARN_ONCE(1, "Your BIOS is broken; DMAR reported at address %llx%s!\n"
+                  "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
+                  addr, message,
+                  dmi_get_system_info(DMI_BIOS_VENDOR),
+                  dmi_get_system_info(DMI_BIOS_VERSION),
+                  dmi_get_system_info(DMI_PRODUCT_VERSION));
+}
 
 int __init check_zero_address(void)
 {
@@ -644,13 +652,7 @@ int __init check_zero_address(void)
 
                         drhd = (void *)entry_header;
                         if (!drhd->address) {
-                                /* Promote an attitude of violence to a BIOS engineer today */
-                                WARN(1, "Your BIOS is broken; DMAR reported at address zero!\n"
-                                     "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
-                                     dmi_get_system_info(DMI_BIOS_VENDOR),
-                                     dmi_get_system_info(DMI_BIOS_VERSION),
-                                     dmi_get_system_info(DMI_PRODUCT_VERSION));
-                                bios_warned = 1;
+                                warn_invalid_dmar(0, "");
                                 goto failed;
                         }
 
@@ -663,14 +665,8 @@ int __init check_zero_address(void)
                         ecap = dmar_readq(addr + DMAR_ECAP_REG);
                         early_iounmap(addr, VTD_PAGE_SIZE);
                         if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) {
-                                /* Promote an attitude of violence to a BIOS engineer today */
-                                WARN(1, "Your BIOS is broken; DMAR reported at address %llx returns all ones!\n"
-                                     "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
-                                      drhd->address,
-                                      dmi_get_system_info(DMI_BIOS_VENDOR),
-                                      dmi_get_system_info(DMI_BIOS_VERSION),
-                                      dmi_get_system_info(DMI_PRODUCT_VERSION));
-                                bios_warned = 1;
+                                warn_invalid_dmar(drhd->address,
+                                                  " returns all ones");
                                 goto failed;
                         }
                 }
@@ -735,14 +731,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
         int msagaw = 0;
 
         if (!drhd->reg_base_addr) {
-                if (!bios_warned) {
-                        WARN(1, "Your BIOS is broken; DMAR reported at address zero!\n"
-                             "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
-                             dmi_get_system_info(DMI_BIOS_VENDOR),
-                             dmi_get_system_info(DMI_BIOS_VERSION),
-                             dmi_get_system_info(DMI_PRODUCT_VERSION));
-                        bios_warned = 1;
-                }
+                warn_invalid_dmar(0, "");
                 return -EINVAL;
         }
 
@@ -762,16 +751,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
         iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
 
         if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) {
-                if (!bios_warned) {
-                        /* Promote an attitude of violence to a BIOS engineer today */
-                        WARN(1, "Your BIOS is broken; DMAR reported at address %llx returns all ones!\n"
-                             "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
-                             drhd->reg_base_addr,
-                             dmi_get_system_info(DMI_BIOS_VENDOR),
-                             dmi_get_system_info(DMI_BIOS_VERSION),
-                             dmi_get_system_info(DMI_PRODUCT_VERSION));
-                        bios_warned = 1;
-                }
+                warn_invalid_dmar(drhd->reg_base_addr, " returns all ones");
                 goto err_unmap;
         }