summaryrefslogtreecommitdiffstats
path: root/drivers/iommu
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 20:54:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 20:54:57 -0800
commit457fa3469a65a524be04412f5cd497fa3b11c9fd (patch)
treee826786d7838668595dfac115ced53b32e5c97b9 /drivers/iommu
parentb07039b79c9ea64c1eacda1e01d645082e4a0d5d (diff)
parentfbc4904c287778ddb74bf6060ac9dec51992fc53 (diff)
downloadlinux-457fa3469a65a524be04412f5cd497fa3b11c9fd.tar.bz2
Merge tag 'char-misc-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH: "Here is the big set of char and misc driver patches for 4.21-rc1. Lots of different types of driver things in here, as this tree seems to be the "collection of various driver subsystems not big enough to have their own git tree" lately. Anyway, some highlights of the changes in here: - binderfs: is it a rule that all driver subsystems will eventually grow to have their own filesystem? Binder now has one to handle the use of it in containerized systems. This was discussed at the Plumbers conference a few months ago and knocked into mergable shape very fast by Christian Brauner. Who also has signed up to be another binder maintainer, showing a distinct lack of good judgement :) - binder updates and fixes - mei driver updates - fpga driver updates and additions - thunderbolt driver updates - soundwire driver updates - extcon driver updates - nvmem driver updates - hyper-v driver updates - coresight driver updates - pvpanic driver additions and reworking for more device support - lp driver updates. Yes really, it's _finally_ moved to the proper parallal port driver model, something I never thought I would see happen. Good stuff. - other tiny driver updates and fixes. All of these have been in linux-next for a while with no reported issues" * tag 'char-misc-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (116 commits) MAINTAINERS: add another Android binder maintainer intel_th: msu: Fix an off-by-one in attribute store stm class: Add a reference to the SyS-T document stm class: Fix a module refcount leak in policy creation error path char: lp: use new parport device model char: lp: properly count the lp devices char: lp: use first unused lp number while registering char: lp: detach the device when parallel port is removed char: lp: introduce list to save port number bus: qcom: remove duplicated include from qcom-ebi2.c VMCI: Use memdup_user() rather than duplicating its implementation char/rtc: Use of_node_name_eq for node name comparisons misc: mic: fix a DMA pool free failure ptp: fix an IS_ERR() vs NULL check genwqe: Fix size check binder: implement binderfs binder: fix use-after-free due to ksys_close() during fdget() bus: fsl-mc: remove duplicated include files bus: fsl-mc: explicitly define the fsl_mc_command endianness misc: ti-st: make array read_ver_cmd static, shrinks object size ...
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/dmar.c25
-rw-r--r--drivers/iommu/intel-iommu.c56
2 files changed, 78 insertions, 3 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index d9c748b6f9e4..1edf2a251336 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -2042,3 +2042,28 @@ int dmar_device_remove(acpi_handle handle)
{
return dmar_device_hotplug(handle, false);
}
+
+/*
+ * dmar_platform_optin - Is %DMA_CTRL_PLATFORM_OPT_IN_FLAG set in DMAR table
+ *
+ * Returns true if the platform has %DMA_CTRL_PLATFORM_OPT_IN_FLAG set in
+ * the ACPI DMAR table. This means that the platform boot firmware has made
+ * sure no device can issue DMA outside of RMRR regions.
+ */
+bool dmar_platform_optin(void)
+{
+ struct acpi_table_dmar *dmar;
+ acpi_status status;
+ bool ret;
+
+ status = acpi_get_table(ACPI_SIG_DMAR, 0,
+ (struct acpi_table_header **)&dmar);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ ret = !!(dmar->flags & DMAR_PLATFORM_OPT_IN);
+ acpi_put_table((struct acpi_table_header *)dmar);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dmar_platform_optin);
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0ad67d65bbce..63b6ce78492a 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -184,6 +184,7 @@ static int rwbf_quirk;
*/
static int force_on = 0;
int intel_iommu_tboot_noforce;
+static int no_platform_optin;
#define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
@@ -503,6 +504,7 @@ static int __init intel_iommu_setup(char *str)
pr_info("IOMMU enabled\n");
} else if (!strncmp(str, "off", 3)) {
dmar_disabled = 1;
+ no_platform_optin = 1;
pr_info("IOMMU disabled\n");
} else if (!strncmp(str, "igfx_off", 8)) {
dmar_map_gfx = 0;
@@ -1471,7 +1473,8 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info)
if (info->pri_supported && !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32))
info->pri_enabled = 1;
#endif
- if (info->ats_supported && !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) {
+ if (!pdev->untrusted && info->ats_supported &&
+ !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) {
info->ats_enabled = 1;
domain_update_iotlb(info->domain);
info->ats_qdep = pci_ats_queue_depth(pdev);
@@ -2895,6 +2898,13 @@ static int iommu_should_identity_map(struct device *dev, int startup)
if (device_is_rmrr_locked(dev))
return 0;
+ /*
+ * Prevent any device marked as untrusted from getting
+ * placed into the statically identity mapping domain.
+ */
+ if (pdev->untrusted)
+ return 0;
+
if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
return 1;
@@ -4722,14 +4732,54 @@ const struct attribute_group *intel_iommu_groups[] = {
NULL,
};
+static int __init platform_optin_force_iommu(void)
+{
+ struct pci_dev *pdev = NULL;
+ bool has_untrusted_dev = false;
+
+ if (!dmar_platform_optin() || no_platform_optin)
+ return 0;
+
+ for_each_pci_dev(pdev) {
+ if (pdev->untrusted) {
+ has_untrusted_dev = true;
+ break;
+ }
+ }
+
+ if (!has_untrusted_dev)
+ return 0;
+
+ if (no_iommu || dmar_disabled)
+ pr_info("Intel-IOMMU force enabled due to platform opt in\n");
+
+ /*
+ * If Intel-IOMMU is disabled by default, we will apply identity
+ * map for all devices except those marked as being untrusted.
+ */
+ if (dmar_disabled)
+ iommu_identity_mapping |= IDENTMAP_ALL;
+
+ dmar_disabled = 0;
+#if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB)
+ swiotlb = 0;
+#endif
+ no_iommu = 0;
+
+ return 1;
+}
+
int __init intel_iommu_init(void)
{
int ret = -ENODEV;
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
- /* VT-d is required for a TXT/tboot launch, so enforce that */
- force_on = tboot_force_iommu();
+ /*
+ * Intel IOMMU is required for a TXT/tboot launch or platform
+ * opt in, so enforce that.
+ */
+ force_on = tboot_force_iommu() || platform_optin_force_iommu();
if (iommu_init_mempool()) {
if (force_on)