Nested translation is a hardware feature that is supported by many modern
IOMMU hardwares. It has two stages (stage-1, stage-2) address translation
to get access to the physical address. stage-1 translation table is owned
by userspace (e.g. by a guest OS), while stage-2 is owned by kernel. Changes
to stage-1 translation table should be followed by an IOTLB invalidation.
Take Intel VT-d as an example, the stage-1 translation table is I/O page
table. As the below diagram shows, guest I/O page table pointer in GPA
(guest physical address) is passed to host and be used to perform the stage-1
address translation. Along with it, modifications to present mappings in the
guest I/O page table should be followed with an IOTLB invalidation.
.-------------. .---------------------------.
| vIOMMU | | Guest I/O page table |
| | '---------------------------'
.----------------/
| PASID Entry |--- PASID cache flush --+
'-------------' |
| | V
| | I/O page table pointer in GPA
'-------------'
Guest
------| Shadow |---------------------------|--------
v v v
Host
.-------------. .------------------------.
| pIOMMU | | FS for GIOVA->GPA |
| | '------------------------'
.----------------/ |
| PASID Entry | V (Nested xlate)
'----------------\.----------------------------------.
| | | SS for GPA->HPA, unmanaged domain|
| | '----------------------------------'
'-------------'
Where:
- FS = First stage page tables
- SS = Second stage page tables
<Intel VT-d Nested translation>
This series is based on the first part which was merged [1], this series is to
add the cache invalidation interface or the userspace to invalidate cache after
modifying the stage-1 page table. This includes both the iommufd changes and the
VT-d driver changes.
Complete code can be found in [2], QEMU could can be found in [3].
At last, this is a team work together with Nicolin Chen, Lu Baolu. Thanks
them for the help. ^_^. Look forward to your feedbacks.
[1] https://lore.kernel.org/linux-iommu/[email protected]/ - merged
[2] https://github.com/yiliu1765/iommufd/tree/iommufd_nesting
[3] https://github.com/yiliu1765/qemu/tree/zhenzhong/wip/iommufd_nesting_rfcv1
Change log:
v8:
- Pass invalidation hint to the cache invalidation helper in the cache_invalidate_user
op path (Kevin)
- Move the devTLB invalidation out of info->iommu loop (Kevin, Weijiang)
- Clear *fault per restart in qi_submit_sync() to avoid acroos submission error
accumulation. (Kevin)
- Define the vtd cache invalidation uapi structure in separate patch (Kevin)
- Rename inv_error to be hw_error (Kevin)
- Rename 'reqs_uptr', 'req_type', 'req_len' and 'req_num' to be 'data_uptr',
'data_type', "entry_len' and 'entry_num" (Kevin)
- Allow user to set IOMMU_TEST_INVALIDATE_FLAG_ALL and IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR
in the same time (Kevin)
v7: https://lore.kernel.org/linux-iommu/[email protected]/
- Remove domain->ops->cache_invalidate_user check in hwpt alloc path due
to failure in bisect (Baolu)
- Remove out_driver_error_code from struct iommu_hwpt_invalidate after
discussion in v6. Should expect per-entry error code.
- Rework the selftest cache invalidation part to report a per-entry error
- Allow user to pass in an empty array to have a try-and-fail mechanism for
user to check if a given req_type is supported by the kernel (Jason)
- Define a separate enum type for cache invalidation data (Jason)
- Fix the IOMMU_HWPT_INVALIDATE to always update the req_num field before
returning (Nicolin)
- Merge the VT-d nesting part 2/2
https://lore.kernel.org/linux-iommu/[email protected]/
into this series to avoid defining empty enum in the middle of the series.
The major difference is adding the VT-d related invalidation uapi structures
together with the generic data structures in patch 02 of this series.
- VT-d driver was refined to report ICE/ITE error from the bottom cache
invalidation submit helpers, hence the cache_invalidate_user op could
report such errors via the per-entry error field to user. VT-d driver
will not stop the invalidation array walking due to the ICE/ITE errors
as such errors are defined by VT-d spec, userspace should be able to
handle it and let the real user (say Virtual Machine) know about it.
But for other errors like invalid uapi data structure configuration,
memory copy failure, such errors should stop the array walking as it
may have more issues if go on.
- Minor fixes per Jason and Kevin's review comments
v6: https://lore.kernel.org/linux-iommu/[email protected]/
- No much change, just rebase on top of 6.7-rc1 as part 1/2 is merged
v5: https://lore.kernel.org/linux-iommu/[email protected]/#t
- Split the iommufd nesting series into two parts of alloc_user and
invalidation (Jason)
- Split IOMMUFD_OBJ_HW_PAGETABLE to IOMMUFD_OBJ_HWPT_PAGING/_NESTED, and
do the same with the structures/alloc()/abort()/destroy(). Reworked the
selftest accordingly too. (Jason)
- Move hwpt/data_type into struct iommu_user_data from standalone op
arguments. (Jason)
- Rename hwpt_type to be data_type, the HWPT_TYPE to be HWPT_ALLOC_DATA,
_TYPE_DEFAULT to be _ALLOC_DATA_NONE (Jason, Kevin)
- Rename iommu_copy_user_data() to iommu_copy_struct_from_user() (Kevin)
- Add macro to the iommu_copy_struct_from_user() to calculate min_size
(Jason)
- Fix two bugs spotted by ZhaoYan
v4: https://lore.kernel.org/linux-iommu/[email protected]/
- Separate HWPT alloc/destroy/abort functions between user-managed HWPTs
and kernel-managed HWPTs
- Rework invalidate uAPI to be a multi-request array-based design
- Add a struct iommu_user_data_array and a helper for driver to sanitize
and copy the entry data from user space invalidation array
- Add a patch fixing TEST_LENGTH() in selftest program
- Drop IOMMU_RESV_IOVA_RANGES patches
- Update kdoc and inline comments
- Drop the code to add IOMMU_RESV_SW_MSI to kernel-managed HWPT in nested translation,
this does not change the rule that resv regions should only be added to the
kernel-managed HWPT. The IOMMU_RESV_SW_MSI stuff will be added in later series
as it is needed only by SMMU so far.
v3: https://lore.kernel.org/linux-iommu/[email protected]/
- Add new uAPI things in alphabetical order
- Pass in "enum iommu_hwpt_type hwpt_type" to op->domain_alloc_user for
sanity, replacing the previous op->domain_alloc_user_data_len solution
- Return ERR_PTR from domain_alloc_user instead of NULL
- Only add IOMMU_RESV_SW_MSI to kernel-managed HWPT in nested translation (Kevin)
- Add IOMMU_RESV_IOVA_RANGES to report resv iova ranges to userspace hence
userspace is able to exclude the ranges in the stage-1 HWPT (e.g. guest I/O
page table). (Kevin)
- Add selftest coverage for the new IOMMU_RESV_IOVA_RANGES ioctl
- Minor changes per Kevin's inputs
v2: https://lore.kernel.org/linux-iommu/[email protected]/
- Add union iommu_domain_user_data to include all user data structures to avoid
passing void * in kernel APIs.
- Add iommu op to return user data length for user domain allocation
- Rename struct iommu_hwpt_alloc::data_type to be hwpt_type
- Store the invalidation data length in iommu_domain_ops::cache_invalidate_user_data_len
- Convert cache_invalidate_user op to be int instead of void
- Remove @data_type in struct iommu_hwpt_invalidate
- Remove out_hwpt_type_bitmap in struct iommu_hw_info hence drop patch 08 of v1
v1: https://lore.kernel.org/linux-iommu/[email protected]/
Thanks,
Yi Liu
Lu Baolu (4):
iommu: Add cache_invalidate_user op
iommu/vt-d: Allow qi_submit_sync() to return the QI faults
iommu/vt-d: Convert stage-1 cache invalidation to return QI fault
iommu/vt-d: Add iotlb flush for nested domain
Nicolin Chen (4):
iommu: Add iommu_copy_struct_from_user_array helper
iommufd/selftest: Add mock_domain_cache_invalidate_user support
iommufd/selftest: Add IOMMU_TEST_OP_MD_CHECK_IOTLB test op
iommufd/selftest: Add coverage for IOMMU_HWPT_INVALIDATE ioctl
Yi Liu (2):
iommufd: Add IOMMU_HWPT_INVALIDATE
iommufd: Add data structure for Intel VT-d stage-1 cache invalidation
drivers/iommu/intel/dmar.c | 38 ++--
drivers/iommu/intel/iommu.c | 12 +-
drivers/iommu/intel/iommu.h | 8 +-
drivers/iommu/intel/irq_remapping.c | 2 +-
drivers/iommu/intel/nested.c | 118 ++++++++++++
drivers/iommu/intel/pasid.c | 14 +-
drivers/iommu/intel/svm.c | 14 +-
drivers/iommu/iommufd/hw_pagetable.c | 41 ++++
drivers/iommu/iommufd/iommufd_private.h | 10 +
drivers/iommu/iommufd/iommufd_test.h | 39 ++++
drivers/iommu/iommufd/main.c | 3 +
drivers/iommu/iommufd/selftest.c | 86 +++++++++
include/linux/iommu.h | 100 ++++++++++
include/uapi/linux/iommufd.h | 98 ++++++++++
tools/testing/selftests/iommu/iommufd.c | 179 ++++++++++++++++++
tools/testing/selftests/iommu/iommufd_utils.h | 57 ++++++
16 files changed, 781 insertions(+), 38 deletions(-)
--
2.34.1
From: Lu Baolu <[email protected]>
The updates of the PTEs in the nested page table will be propagated to the
hardware caches.
Add a new domain op cache_invalidate_user for the userspace to flush the
hardware caches for a nested domain through iommufd. No wrapper for it,
as it's only supposed to be used by iommufd. Then, pass in invalidation
requests in form of a user data array conatining a number of invalidation
data entries.
Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
include/linux/iommu.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 6291aa7b079b..93c0d12dd047 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -284,6 +284,23 @@ struct iommu_user_data {
size_t len;
};
+/**
+ * struct iommu_user_data_array - iommu driver specific user space data array
+ * @type: The data type of all the entries in the user buffer array
+ * @uptr: Pointer to the user buffer array
+ * @entry_len: The fixed-width length of an entry in the array, in bytes
+ * @entry_num: The number of total entries in the array
+ *
+ * The user buffer includes an array of requests with format defined in
+ * include/uapi/linux/iommufd.h
+ */
+struct iommu_user_data_array {
+ unsigned int type;
+ void __user *uptr;
+ size_t entry_len;
+ u32 entry_num;
+};
+
/**
* __iommu_copy_struct_from_user - Copy iommu driver specific user space data
* @dst_data: Pointer to an iommu driver specific user data that is defined in
@@ -440,6 +457,13 @@ struct iommu_ops {
* @iotlb_sync_map: Sync mappings created recently using @map to the hardware
* @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
* queue
+ * @cache_invalidate_user: Flush hardware cache for user space IO page table.
+ * The @domain must be IOMMU_DOMAIN_NESTED. The @array
+ * passes in the cache invalidation requests, in form
+ * of a driver data structure. The driver must update
+ * array->entry_num to report the number of handled
+ * invalidation requests. The driver data structure
+ * must be defined in include/uapi/linux/iommufd.h
* @iova_to_phys: translate iova to physical address
* @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
* including no-snoop TLPs on PCIe or other platform
@@ -465,6 +489,8 @@ struct iommu_domain_ops {
size_t size);
void (*iotlb_sync)(struct iommu_domain *domain,
struct iommu_iotlb_gather *iotlb_gather);
+ int (*cache_invalidate_user)(struct iommu_domain *domain,
+ struct iommu_user_data_array *array);
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
dma_addr_t iova);
--
2.34.1
In nested translation, the stage-1 page table is user-managed but cached
by the IOMMU hardware, so an update on present page table entries in the
stage-1 page table should be followed with a cache invalidation.
Add an IOMMU_HWPT_INVALIDATE ioctl to support such a cache invalidation.
It takes hwpt_id to specify the iommu_domain, and a multi-entry array to
support multiple invalidation data in one ioctl.
enum iommu_hwpt_invalidate_data_type is defined to tag the data type of
the entries in the multi-entry array.
Co-developed-by: Nicolin Chen <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
drivers/iommu/iommufd/hw_pagetable.c | 41 +++++++++++++++++++++++
drivers/iommu/iommufd/iommufd_private.h | 10 ++++++
drivers/iommu/iommufd/main.c | 3 ++
include/uapi/linux/iommufd.h | 43 +++++++++++++++++++++++++
4 files changed, 97 insertions(+)
diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
index cbb5df0a6c32..4e8711f19f72 100644
--- a/drivers/iommu/iommufd/hw_pagetable.c
+++ b/drivers/iommu/iommufd/hw_pagetable.c
@@ -371,3 +371,44 @@ int iommufd_hwpt_get_dirty_bitmap(struct iommufd_ucmd *ucmd)
iommufd_put_object(ucmd->ictx, &hwpt_paging->common.obj);
return rc;
}
+
+int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
+{
+ struct iommu_hwpt_invalidate *cmd = ucmd->cmd;
+ struct iommu_user_data_array data_array = {
+ .type = cmd->data_type,
+ .uptr = u64_to_user_ptr(cmd->data_uptr),
+ .entry_len = cmd->entry_len,
+ .entry_num = cmd->entry_num,
+ };
+ struct iommufd_hw_pagetable *hwpt;
+ u32 done_num = 0;
+ int rc;
+
+ if (cmd->__reserved) {
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (cmd->entry_num && (!cmd->data_uptr || !cmd->entry_len)) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ hwpt = iommufd_get_hwpt_nested(ucmd, cmd->hwpt_id);
+ if (IS_ERR(hwpt)) {
+ rc = PTR_ERR(hwpt);
+ goto out;
+ }
+
+ rc = hwpt->domain->ops->cache_invalidate_user(hwpt->domain,
+ &data_array);
+ done_num = data_array.entry_num;
+
+ iommufd_put_object(ucmd->ictx, &hwpt->obj);
+out:
+ cmd->entry_num = done_num;
+ if (iommufd_ucmd_respond(ucmd, sizeof(*cmd)))
+ return -EFAULT;
+ return rc;
+}
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index abae041e256f..991f864d1f9b 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -328,6 +328,15 @@ iommufd_get_hwpt_paging(struct iommufd_ucmd *ucmd, u32 id)
IOMMUFD_OBJ_HWPT_PAGING),
struct iommufd_hwpt_paging, common.obj);
}
+
+static inline struct iommufd_hw_pagetable *
+iommufd_get_hwpt_nested(struct iommufd_ucmd *ucmd, u32 id)
+{
+ return container_of(iommufd_get_object(ucmd->ictx, id,
+ IOMMUFD_OBJ_HWPT_NESTED),
+ struct iommufd_hw_pagetable, obj);
+}
+
int iommufd_hwpt_set_dirty_tracking(struct iommufd_ucmd *ucmd);
int iommufd_hwpt_get_dirty_bitmap(struct iommufd_ucmd *ucmd);
@@ -345,6 +354,7 @@ void iommufd_hwpt_paging_abort(struct iommufd_object *obj);
void iommufd_hwpt_nested_destroy(struct iommufd_object *obj);
void iommufd_hwpt_nested_abort(struct iommufd_object *obj);
int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd);
+int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd);
static inline void iommufd_hw_pagetable_put(struct iommufd_ctx *ictx,
struct iommufd_hw_pagetable *hwpt)
diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c
index c9091e46d208..39b32932c61e 100644
--- a/drivers/iommu/iommufd/main.c
+++ b/drivers/iommu/iommufd/main.c
@@ -322,6 +322,7 @@ union ucmd_buffer {
struct iommu_hw_info info;
struct iommu_hwpt_alloc hwpt;
struct iommu_hwpt_get_dirty_bitmap get_dirty_bitmap;
+ struct iommu_hwpt_invalidate cache;
struct iommu_hwpt_set_dirty_tracking set_dirty_tracking;
struct iommu_ioas_alloc alloc;
struct iommu_ioas_allow_iovas allow_iovas;
@@ -360,6 +361,8 @@ static const struct iommufd_ioctl_op iommufd_ioctl_ops[] = {
__reserved),
IOCTL_OP(IOMMU_HWPT_GET_DIRTY_BITMAP, iommufd_hwpt_get_dirty_bitmap,
struct iommu_hwpt_get_dirty_bitmap, data),
+ IOCTL_OP(IOMMU_HWPT_INVALIDATE, iommufd_hwpt_invalidate,
+ struct iommu_hwpt_invalidate, __reserved),
IOCTL_OP(IOMMU_HWPT_SET_DIRTY_TRACKING, iommufd_hwpt_set_dirty_tracking,
struct iommu_hwpt_set_dirty_tracking, __reserved),
IOCTL_OP(IOMMU_IOAS_ALLOC, iommufd_ioas_alloc_ioctl,
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 0b2bc6252e2c..824560c50ec6 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -49,6 +49,7 @@ enum {
IOMMUFD_CMD_GET_HW_INFO,
IOMMUFD_CMD_HWPT_SET_DIRTY_TRACKING,
IOMMUFD_CMD_HWPT_GET_DIRTY_BITMAP,
+ IOMMUFD_CMD_HWPT_INVALIDATE,
};
/**
@@ -613,4 +614,46 @@ struct iommu_hwpt_get_dirty_bitmap {
#define IOMMU_HWPT_GET_DIRTY_BITMAP _IO(IOMMUFD_TYPE, \
IOMMUFD_CMD_HWPT_GET_DIRTY_BITMAP)
+/**
+ * enum iommu_hwpt_invalidate_data_type - IOMMU HWPT Cache Invalidation
+ * Data Type
+ * @IOMMU_HWPT_INVALIDATE_DATA_VTD_S1: Invalidation data for VTD_S1
+ */
+enum iommu_hwpt_invalidate_data_type {
+ IOMMU_HWPT_INVALIDATE_DATA_VTD_S1,
+};
+
+/**
+ * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
+ * @size: sizeof(struct iommu_hwpt_invalidate)
+ * @hwpt_id: ID of a nested HWPT for cache invalidation
+ * @data_uptr: User pointer to an array of driver-specific cache invalidation
+ * data.
+ * @data_type: One of enum iommu_hwpt_invalidate_data_type, defining the data
+ * type of all the entries in the invalidation request array. It
+ * should be a type supported by the hwpt pointed by @hwpt_id.
+ * @entry_len: Length (in bytes) of a request entry in the request array
+ * @entry_num: Input the number of cache invalidation requests in the array.
+ * Output the number of requests successfully handled by kernel.
+ * @__reserved: Must be 0.
+ *
+ * Invalidate the iommu cache for user-managed page table. Modifications on a
+ * user-managed page table should be followed by this operation to sync cache.
+ * Each ioctl can support one or more cache invalidation requests in the array
+ * that has a total size of @entry_len * @entry_num.
+ *
+ * An empty invalidation request array by setting @entry_num==0 is allowed, and
+ * @entry_len and @data_uptr would be ignored in this case. This can be used to
+ * check if the given @data_type is supported or not by kernel.
+ */
+struct iommu_hwpt_invalidate {
+ __u32 size;
+ __u32 hwpt_id;
+ __aligned_u64 data_uptr;
+ __u32 data_type;
+ __u32 entry_len;
+ __u32 entry_num;
+ __u32 __reserved;
+};
+#define IOMMU_HWPT_INVALIDATE _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_INVALIDATE)
#endif
--
2.34.1
From: Nicolin Chen <[email protected]>
Add mock_domain_cache_invalidate_user() data structure to support user
space selftest program to cover user cache invalidation pathway.
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Co-developed-by: Yi Liu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
drivers/iommu/iommufd/iommufd_test.h | 34 ++++++++++++++++
drivers/iommu/iommufd/selftest.c | 60 ++++++++++++++++++++++++++++
2 files changed, 94 insertions(+)
diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 7910fbe1962d..2eef5afde711 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -148,4 +148,38 @@ struct iommu_hwpt_selftest {
__u32 iotlb;
};
+/* Should not be equal to any defined value in enum iommu_hwpt_invalidate_data_type */
+#define IOMMU_HWPT_INVALIDATE_DATA_SELFTEST 0xdeadbeef
+#define IOMMU_HWPT_INVALIDATE_DATA_SELFTEST_INVALID 0xdadbeef
+
+/**
+ * enum iommu_hwpt_invalidate_selftest_error - Hardware error of invalidation
+ * @IOMMU_TEST_INVALIDATE_FAKE_ERROR: Fake hw error per test program's request
+ */
+enum iommu_hwpt_invalidate_selftest_error {
+ IOMMU_TEST_INVALIDATE_FAKE_ERROR = (1 << 0)
+};
+
+/**
+ * struct iommu_hwpt_invalidate_selftest - Invalidation data for Mock driver
+ * (IOMMU_HWPT_INVALIDATE_DATA_SELFTEST)
+ * @flags: Invalidate flags
+ * @iotlb_id: Invalidate iotlb entry index
+ * @hw_error: One of enum iommu_hwpt_invalidate_selftest_error
+ * @__reserved: Must be 0
+ *
+ * If IOMMU_TEST_INVALIDATE_ALL is set in @flags, @iotlb_id will be ignored
+ * @hw_error meaningful only if the request is processed successfully.
+ * If IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR is set in @flags, report a
+ * hw error back, cache would not be invalidated in this case.
+ */
+struct iommu_hwpt_invalidate_selftest {
+#define IOMMU_TEST_INVALIDATE_FLAG_ALL (1 << 0)
+#define IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR (1 << 1)
+ __u32 flags;
+ __u32 iotlb_id;
+ __u32 hw_error;
+ __u32 __reserved;
+};
+
#endif
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 022ef8f55088..ebc6c15abf67 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -473,9 +473,69 @@ static void mock_domain_free_nested(struct iommu_domain *domain)
kfree(mock_nested);
}
+static int
+mock_domain_cache_invalidate_user(struct iommu_domain *domain,
+ struct iommu_user_data_array *array)
+{
+ struct mock_iommu_domain_nested *mock_nested =
+ container_of(domain, struct mock_iommu_domain_nested, domain);
+ u32 hw_error = 0, processed = 0;
+ struct iommu_hwpt_invalidate_selftest inv;
+ int i = 0, j;
+ int rc = 0;
+
+ if (array->type != IOMMU_HWPT_INVALIDATE_DATA_SELFTEST) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ for ( ; i < array->entry_num; i++) {
+ rc = iommu_copy_struct_from_user_array(&inv, array,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ i, __reserved);
+ if (rc)
+ break;
+
+ if ((inv.flags & ~(IOMMU_TEST_INVALIDATE_FLAG_ALL |
+ IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR)) ||
+ inv.__reserved) {
+ rc = -EOPNOTSUPP;
+ break;
+ }
+
+ if (inv.iotlb_id > MOCK_NESTED_DOMAIN_IOTLB_ID_MAX) {
+ rc = -EINVAL;
+ break;
+ }
+
+ if (inv.flags & IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR) {
+ hw_error = IOMMU_TEST_INVALIDATE_FAKE_ERROR;
+ } else if (inv.flags & IOMMU_TEST_INVALIDATE_FLAG_ALL) {
+ /* Invalidate all mock iotlb entries and ignore iotlb_id */
+ for (j = 0; j < MOCK_NESTED_DOMAIN_IOTLB_NUM; j++)
+ mock_nested->iotlb[j] = 0;
+ } else {
+ mock_nested->iotlb[inv.iotlb_id] = 0;
+ }
+
+ inv.hw_error = hw_error;
+ rc = iommu_respond_struct_to_user_array(array, i, (void *)&inv,
+ sizeof(inv));
+ if (rc)
+ break;
+
+ processed++;
+ }
+
+out:
+ array->entry_num = processed;
+ return rc;
+}
+
static struct iommu_domain_ops domain_nested_ops = {
.free = mock_domain_free_nested,
.attach_dev = mock_domain_nop_attach,
+ .cache_invalidate_user = mock_domain_cache_invalidate_user,
};
static inline struct iommufd_hw_pagetable *
--
2.34.1
From: Nicolin Chen <[email protected]>
Wrap up the data pointer/num sanity and __iommu_copy_struct_from_user
call for iommu drivers to copy driver specific data at a specific location
in the struct iommu_user_data_array, and iommu_respond_struct_to_user_array()
to copy response to a specific location in the struct iommu_user_data_array.
And expect it to be used in cache_invalidate_user ops for example.
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Co-developed-by: Yi Liu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
include/linux/iommu.h | 74 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 93c0d12dd047..c3434c9eaa6d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -341,6 +341,80 @@ static inline int __iommu_copy_struct_from_user(
sizeof(*kdst), \
offsetofend(typeof(*kdst), min_last))
+/**
+ * __iommu_copy_struct_from_user_array - Copy iommu driver specific user space
+ * data from an iommu_user_data_array
+ * @dst_data: Pointer to an iommu driver specific user data that is defined in
+ * include/uapi/linux/iommufd.h
+ * @src_array: Pointer to a struct iommu_user_data_array for a user space array
+ * @data_type: The data type of the @dst_data. Must match with @src_array.type
+ * @index: Index to the location in the array to copy user data from
+ * @data_len: Length of current user data structure, i.e. sizeof(struct _dst)
+ * @min_len: Initial length of user data structure for backward compatibility.
+ * This should be offsetofend using the last member in the user data
+ * struct that was initially added to include/uapi/linux/iommufd.h
+ */
+static inline int
+__iommu_copy_struct_from_user_array(void *dst_data,
+ const struct iommu_user_data_array *src_array,
+ unsigned int data_type, unsigned int index,
+ size_t data_len, size_t min_len)
+{
+ struct iommu_user_data src_data;
+
+ if (WARN_ON(!src_array || index >= src_array->entry_num))
+ return -EINVAL;
+ if (!src_array->entry_num)
+ return -EINVAL;
+ src_data.uptr = src_array->uptr + src_array->entry_len * index;
+ src_data.len = src_array->entry_len;
+ src_data.type = src_array->type;
+
+ return __iommu_copy_struct_from_user(dst_data, &src_data, data_type,
+ data_len, min_len);
+}
+
+/**
+ * iommu_copy_struct_from_user_array - Copy iommu driver specific user space
+ * data from an iommu_user_data_array
+ * @kdst: Pointer to an iommu driver specific user data that is defined in
+ * include/uapi/linux/iommufd.h
+ * @user_array: Pointer to a struct iommu_user_data_array for a user space
+ * array
+ * @data_type: The data type of the @kdst. Must match with @user_array->type
+ * @index: Index to the location in the array to copy user data from
+ * @min_last: The last memember of the data structure @kdst points in the
+ * initial version.
+ * Return 0 for success, otherwise -error.
+ */
+#define iommu_copy_struct_from_user_array(kdst, user_array, data_type, \
+ index, min_last) \
+ __iommu_copy_struct_from_user_array(kdst, user_array, data_type, \
+ index, sizeof(*kdst), \
+ offsetofend(typeof(*kdst), \
+ min_last))
+
+/**
+ * iommu_respond_struct_to_user_array - Copy the response in @ksrc back to
+ * a specific entry of user array
+ * @user_array: Pointer to a struct iommu_user_data_array for a user space
+ * array
+ * @index: Index to the location in the array to copy response
+ * @ksrc: Pointer to kernel structure
+ * @klen: Length of @ksrc struct
+ *
+ * This only copies response of one entry (@index) in @user_array.
+ */
+static inline int
+iommu_respond_struct_to_user_array(const struct iommu_user_data_array *array,
+ unsigned int index, void *ksrc, size_t klen)
+{
+ if (copy_to_user(array->uptr + array->entry_len * index,
+ ksrc, min_t(size_t, array->entry_len, klen)))
+ return -EFAULT;
+ return 0;
+}
+
/**
* struct iommu_ops - iommu ops and capabilities
* @capable: check capability
--
2.34.1
From: Nicolin Chen <[email protected]>
Allow to test whether IOTLB has been invalidated or not.
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
drivers/iommu/iommufd/iommufd_test.h | 5 ++++
drivers/iommu/iommufd/selftest.c | 26 +++++++++++++++++++
tools/testing/selftests/iommu/iommufd.c | 4 +++
tools/testing/selftests/iommu/iommufd_utils.h | 24 +++++++++++++++++
4 files changed, 59 insertions(+)
diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 2eef5afde711..1cedd6b5ba2b 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -21,6 +21,7 @@ enum {
IOMMU_TEST_OP_ACCESS_REPLACE_IOAS,
IOMMU_TEST_OP_MOCK_DOMAIN_FLAGS,
IOMMU_TEST_OP_DIRTY,
+ IOMMU_TEST_OP_MD_CHECK_IOTLB,
};
enum {
@@ -121,6 +122,10 @@ struct iommu_test_cmd {
__aligned_u64 uptr;
__aligned_u64 out_nr_dirty;
} dirty;
+ struct {
+ __u32 id;
+ __u32 iotlb;
+ } check_iotlb;
};
__u32 last;
};
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index ebc6c15abf67..9528528cab27 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -853,6 +853,28 @@ static int iommufd_test_md_check_refs(struct iommufd_ucmd *ucmd,
return 0;
}
+static int iommufd_test_md_check_iotlb(struct iommufd_ucmd *ucmd,
+ u32 mockpt_id, unsigned int iotlb_id,
+ u32 iotlb)
+{
+ struct mock_iommu_domain_nested *mock_nested;
+ struct iommufd_hw_pagetable *hwpt;
+ int rc = 0;
+
+ hwpt = get_md_pagetable_nested(ucmd, mockpt_id, &mock_nested);
+ if (IS_ERR(hwpt))
+ return PTR_ERR(hwpt);
+
+ mock_nested = container_of(hwpt->domain,
+ struct mock_iommu_domain_nested, domain);
+
+ if (iotlb_id > MOCK_NESTED_DOMAIN_IOTLB_ID_MAX ||
+ mock_nested->iotlb[iotlb_id] != iotlb)
+ rc = -EINVAL;
+ iommufd_put_object(ucmd->ictx, &hwpt->obj);
+ return rc;
+}
+
struct selftest_access {
struct iommufd_access *access;
struct file *file;
@@ -1334,6 +1356,10 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
return iommufd_test_md_check_refs(
ucmd, u64_to_user_ptr(cmd->check_refs.uptr),
cmd->check_refs.length, cmd->check_refs.refs);
+ case IOMMU_TEST_OP_MD_CHECK_IOTLB:
+ return iommufd_test_md_check_iotlb(ucmd, cmd->id,
+ cmd->check_iotlb.id,
+ cmd->check_iotlb.iotlb);
case IOMMU_TEST_OP_CREATE_ACCESS:
return iommufd_test_create_access(ucmd, cmd->id,
cmd->create_access.flags);
diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index 6ed328c863c4..c8763b880a16 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -330,6 +330,10 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
&nested_hwpt_id[1],
IOMMU_HWPT_DATA_SELFTEST, &data,
sizeof(data));
+ test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[0],
+ IOMMU_TEST_IOTLB_DEFAULT);
+ test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[1],
+ IOMMU_TEST_IOTLB_DEFAULT);
/* Negative test: a nested hwpt on top of a nested hwpt */
test_err_hwpt_alloc_nested(EINVAL, self->device_id,
diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h
index ad9202335656..fe0a0f566b67 100644
--- a/tools/testing/selftests/iommu/iommufd_utils.h
+++ b/tools/testing/selftests/iommu/iommufd_utils.h
@@ -195,6 +195,30 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
_test_cmd_hwpt_alloc(self->fd, device_id, pt_id, flags, \
hwpt_id, data_type, data, data_len))
+#define test_cmd_hwpt_check_iotlb(hwpt_id, iotlb_id, expected) \
+ ({ \
+ struct iommu_test_cmd test_cmd = { \
+ .size = sizeof(test_cmd), \
+ .op = IOMMU_TEST_OP_MD_CHECK_IOTLB, \
+ .id = hwpt_id, \
+ .check_iotlb = { \
+ .id = iotlb_id, \
+ .iotlb = expected, \
+ }, \
+ }; \
+ ASSERT_EQ(0, \
+ ioctl(self->fd, \
+ _IOMMU_TEST_CMD(IOMMU_TEST_OP_MD_CHECK_IOTLB), \
+ &test_cmd)); \
+ })
+
+#define test_cmd_hwpt_check_iotlb_all(hwpt_id, expected) \
+ ({ \
+ int i; \
+ for (i = 0; i < MOCK_NESTED_DOMAIN_IOTLB_NUM; i++) \
+ test_cmd_hwpt_check_iotlb(hwpt_id, i, expected); \
+ })
+
static int _test_cmd_access_replace_ioas(int fd, __u32 access_id,
unsigned int ioas_id)
{
--
2.34.1
From: Nicolin Chen <[email protected]>
Add test cases for the IOMMU_HWPT_INVALIDATE ioctl and verify it by using
the new IOMMU_TEST_OP_MD_CHECK_IOTLB.
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Co-developed-by: Yi Liu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
tools/testing/selftests/iommu/iommufd.c | 175 ++++++++++++++++++
tools/testing/selftests/iommu/iommufd_utils.h | 33 ++++
2 files changed, 208 insertions(+)
diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index c8763b880a16..5c6c1342f371 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -116,6 +116,7 @@ TEST_F(iommufd, cmd_length)
TEST_LENGTH(iommu_destroy, IOMMU_DESTROY, id);
TEST_LENGTH(iommu_hw_info, IOMMU_GET_HW_INFO, __reserved);
TEST_LENGTH(iommu_hwpt_alloc, IOMMU_HWPT_ALLOC, __reserved);
+ TEST_LENGTH(iommu_hwpt_invalidate, IOMMU_HWPT_INVALIDATE, __reserved);
TEST_LENGTH(iommu_ioas_alloc, IOMMU_IOAS_ALLOC, out_ioas_id);
TEST_LENGTH(iommu_ioas_iova_ranges, IOMMU_IOAS_IOVA_RANGES,
out_iova_alignment);
@@ -271,7 +272,9 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
struct iommu_hwpt_selftest data = {
.iotlb = IOMMU_TEST_IOTLB_DEFAULT,
};
+ struct iommu_hwpt_invalidate_selftest inv_reqs[2] = {};
uint32_t nested_hwpt_id[2] = {};
+ uint32_t num_inv;
uint32_t parent_hwpt_id = 0;
uint32_t parent_hwpt_id_not_work = 0;
uint32_t test_hwpt_id = 0;
@@ -344,6 +347,178 @@ TEST_F(iommufd_ioas, alloc_hwpt_nested)
EXPECT_ERRNO(EBUSY,
_test_ioctl_destroy(self->fd, parent_hwpt_id));
+ /* hwpt_invalidate only supports a user-managed hwpt (nested) */
+ num_inv = 1;
+ test_err_hwpt_invalidate(ENOENT, parent_hwpt_id, inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Check data_type by passing zero-length array */
+ num_inv = 0;
+ test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: Invalid data_type */
+ num_inv = 1;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST_INVALID,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: structure size sanity */
+ num_inv = 1;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs) + 1, &num_inv);
+ assert(!num_inv);
+
+ num_inv = 1;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ 1, &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: invalid flag is passed */
+ num_inv = 1;
+ inv_reqs[0].flags = 0xffffffff;
+ test_err_hwpt_invalidate(EOPNOTSUPP, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: non-zero __reserved is passed */
+ num_inv = 1;
+ inv_reqs[0].flags = 0;
+ inv_reqs[0].__reserved = 0x1234;
+ test_err_hwpt_invalidate(EOPNOTSUPP, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: invalid data_uptr when array is not empty */
+ num_inv = 1;
+ inv_reqs[0].flags = 0;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], NULL,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: invalid entry_len when array is not empty */
+ num_inv = 1;
+ inv_reqs[0].flags = 0;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ 0, &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: invalid iotlb_id */
+ num_inv = 1;
+ inv_reqs[0].flags = 0;
+ inv_reqs[0].__reserved = 0;
+ inv_reqs[0].iotlb_id = MOCK_NESTED_DOMAIN_IOTLB_ID_MAX + 1;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!num_inv);
+
+ /* Negative test: trigger error */
+ num_inv = 1;
+ inv_reqs[0].flags = IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR;
+ inv_reqs[0].iotlb_id = 0;
+ test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(num_inv == 1);
+ assert(inv_reqs[0].hw_error == IOMMU_TEST_INVALIDATE_FAKE_ERROR);
+
+ /*
+ * Invalidate the 1st iotlb entry but fail the 2nd request
+ * - mock driver error, the hw_error field is meaningful,
+ * the ioctl returns 0.
+ */
+ num_inv = 2;
+ inv_reqs[0].flags = 0;
+ inv_reqs[0].iotlb_id = 0;
+ inv_reqs[1].flags = IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR;
+ inv_reqs[1].iotlb_id = 1;
+ test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(num_inv == 2);
+ assert(!inv_reqs[0].hw_error);
+ assert(inv_reqs[1].hw_error == IOMMU_TEST_INVALIDATE_FAKE_ERROR);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 0, 0);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 1,
+ IOMMU_TEST_IOTLB_DEFAULT);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 2,
+ IOMMU_TEST_IOTLB_DEFAULT);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 3,
+ IOMMU_TEST_IOTLB_DEFAULT);
+
+ /*
+ * Invalidate the 1st iotlb entry but fail the 2nd request
+ * - ioctl error, the hw_error field is meaningless
+ */
+ num_inv = 2;
+ inv_reqs[0].flags = 0;
+ inv_reqs[0].iotlb_id = 0;
+ inv_reqs[1].flags = 0;
+ inv_reqs[1].iotlb_id = MOCK_NESTED_DOMAIN_IOTLB_ID_MAX + 1;
+ test_err_hwpt_invalidate(EINVAL, nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(num_inv == 1);
+ assert(!inv_reqs[0].hw_error);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 0, 0);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 1,
+ IOMMU_TEST_IOTLB_DEFAULT);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 2,
+ IOMMU_TEST_IOTLB_DEFAULT);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 3,
+ IOMMU_TEST_IOTLB_DEFAULT);
+
+ /* Invalidate the 2nd iotlb entry and verify */
+ num_inv = 1;
+ inv_reqs[0].flags = 0;
+ inv_reqs[0].iotlb_id = 1;
+ test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(!inv_reqs[0].hw_error);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 0, 0);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 1, 0);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 2,
+ IOMMU_TEST_IOTLB_DEFAULT);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 3,
+ IOMMU_TEST_IOTLB_DEFAULT);
+
+ /* Invalidate the 3rd and 4th iotlb entries and verify */
+ num_inv = 2;
+ inv_reqs[0].flags = 0;
+ inv_reqs[0].iotlb_id = 2;
+ inv_reqs[1].flags = 0;
+ inv_reqs[1].iotlb_id = 3;
+ test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(num_inv == 2);
+ assert(!inv_reqs[0].hw_error);
+ assert(!inv_reqs[1].hw_error);
+ test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[0], 0);
+
+ /* Invalidate all iotlb entries for nested_hwpt_id[1] and verify */
+ num_inv = 1;
+ inv_reqs[0].flags = IOMMU_TEST_INVALIDATE_FLAG_ALL;
+ test_cmd_hwpt_invalidate(nested_hwpt_id[1], inv_reqs,
+ IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
+ sizeof(*inv_reqs), &num_inv);
+ assert(num_inv == 1);
+ assert(!inv_reqs[0].hw_error);
+ test_cmd_hwpt_check_iotlb_all(nested_hwpt_id[1], 0);
+
/* Attach device to nested_hwpt_id[0] that then will be busy */
test_cmd_mock_domain_replace(self->stdev_id, nested_hwpt_id[0]);
EXPECT_ERRNO(EBUSY,
diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h
index fe0a0f566b67..7f41fb796a8a 100644
--- a/tools/testing/selftests/iommu/iommufd_utils.h
+++ b/tools/testing/selftests/iommu/iommufd_utils.h
@@ -219,6 +219,39 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id,
test_cmd_hwpt_check_iotlb(hwpt_id, i, expected); \
})
+static int _test_cmd_hwpt_invalidate(int fd, __u32 hwpt_id, void *reqs,
+ uint32_t data_type, uint32_t lreq,
+ uint32_t *nreqs)
+{
+ struct iommu_hwpt_invalidate cmd = {
+ .size = sizeof(cmd),
+ .hwpt_id = hwpt_id,
+ .data_type = data_type,
+ .data_uptr = (uint64_t)reqs,
+ .entry_len = lreq,
+ .entry_num = *nreqs,
+ };
+ int rc = ioctl(fd, IOMMU_HWPT_INVALIDATE, &cmd);
+ *nreqs = cmd.entry_num;
+ return rc;
+}
+
+#define test_cmd_hwpt_invalidate(hwpt_id, reqs, data_type, lreq, nreqs) \
+ ({ \
+ ASSERT_EQ(0, \
+ _test_cmd_hwpt_invalidate(self->fd, hwpt_id, reqs, \
+ data_type, \
+ lreq, nreqs)); \
+ })
+#define test_err_hwpt_invalidate(_errno, hwpt_id, reqs, data_type, lreq, \
+ nreqs) \
+ ({ \
+ EXPECT_ERRNO(_errno, \
+ _test_cmd_hwpt_invalidate(self->fd, hwpt_id, \
+ reqs, data_type, \
+ lreq, nreqs)); \
+ })
+
static int _test_cmd_access_replace_ioas(int fd, __u32 access_id,
unsigned int ioas_id)
{
--
2.34.1
From: Lu Baolu <[email protected]>
This allows qi_submit_sync() to return back faults to callers.
Signed-off-by: Lu Baolu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
drivers/iommu/intel/dmar.c | 31 +++++++++++++++++++----------
drivers/iommu/intel/iommu.h | 2 +-
drivers/iommu/intel/irq_remapping.c | 2 +-
drivers/iommu/intel/pasid.c | 2 +-
drivers/iommu/intel/svm.c | 6 +++---
5 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 23cb80d62a9a..701705b3a8ea 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -1267,7 +1267,8 @@ static void qi_dump_fault(struct intel_iommu *iommu, u32 fault)
(unsigned long long)desc->qw1);
}
-static int qi_check_fault(struct intel_iommu *iommu, int index, int wait_index)
+static int qi_check_fault(struct intel_iommu *iommu, int index,
+ int wait_index, u32 *fsts)
{
u32 fault;
int head, tail;
@@ -1278,8 +1279,12 @@ static int qi_check_fault(struct intel_iommu *iommu, int index, int wait_index)
return -EAGAIN;
fault = readl(iommu->reg + DMAR_FSTS_REG);
- if (fault & (DMA_FSTS_IQE | DMA_FSTS_ITE | DMA_FSTS_ICE))
+ fault &= DMA_FSTS_IQE | DMA_FSTS_ITE | DMA_FSTS_ICE;
+ if (fault) {
+ if (fsts)
+ *fsts |= fault;
qi_dump_fault(iommu, fault);
+ }
/*
* If IQE happens, the head points to the descriptor associated
@@ -1342,9 +1347,11 @@ static int qi_check_fault(struct intel_iommu *iommu, int index, int wait_index)
* time, a wait descriptor will be appended to each submission to ensure
* hardware has completed the invalidation before return. Wait descriptors
* can be part of the submission but it will not be polled for completion.
+ * If callers are interested in the QI faults that occur during the handling
+ * of requests, the QI faults are saved in @fault.
*/
int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
- unsigned int count, unsigned long options)
+ unsigned int count, unsigned long options, u32 *fault)
{
struct q_inval *qi = iommu->qi;
s64 devtlb_start_ktime = 0;
@@ -1376,6 +1383,8 @@ int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
restart:
rc = 0;
+ if (fault)
+ *fault = 0;
raw_spin_lock_irqsave(&qi->q_lock, flags);
/*
@@ -1430,7 +1439,7 @@ int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
* a deadlock where the interrupt context can wait indefinitely
* for free slots in the queue.
*/
- rc = qi_check_fault(iommu, index, wait_index);
+ rc = qi_check_fault(iommu, index, wait_index, fault);
if (rc)
break;
@@ -1476,7 +1485,7 @@ void qi_global_iec(struct intel_iommu *iommu)
desc.qw3 = 0;
/* should never fail */
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm,
@@ -1490,7 +1499,7 @@ void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm,
desc.qw2 = 0;
desc.qw3 = 0;
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
@@ -1514,7 +1523,7 @@ void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
desc.qw2 = 0;
desc.qw3 = 0;
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
@@ -1545,7 +1554,7 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
desc.qw2 = 0;
desc.qw3 = 0;
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
/* PASID-based IOTLB invalidation */
@@ -1586,7 +1595,7 @@ void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid, u64 addr,
QI_EIOTLB_AM(mask);
}
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
/* PASID-based device IOTLB Invalidate */
@@ -1639,7 +1648,7 @@ void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid, u16 pfsid,
desc.qw1 |= QI_DEV_EIOTLB_SIZE;
}
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did,
@@ -1649,7 +1658,7 @@ void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did,
desc.qw0 = QI_PC_PASID(pasid) | QI_PC_DID(did) |
QI_PC_GRAN(granu) | QI_PC_TYPE;
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
/*
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index ce030c5b5772..c6de958e4f54 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -881,7 +881,7 @@ void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did, u64 granu,
u32 pasid);
int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
- unsigned int count, unsigned long options);
+ unsigned int count, unsigned long options, u32 *fault);
/*
* Options used in qi_submit_sync:
* QI_OPT_WAIT_DRAIN - Wait for PRQ drain completion, spec 6.5.2.8.
diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 29b9e55dcf26..f834afa3672d 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -153,7 +153,7 @@ static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
desc.qw2 = 0;
desc.qw3 = 0;
- return qi_submit_sync(iommu, &desc, 1, 0);
+ return qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
static int modify_irte(struct irq_2_iommu *irq_iommu,
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index 74e8e4c17e81..67f924760ba8 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -467,7 +467,7 @@ pasid_cache_invalidation_with_pasid(struct intel_iommu *iommu,
desc.qw2 = 0;
desc.qw3 = 0;
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
static void
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ac12f76c1212..660d049ad5b6 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -543,7 +543,7 @@ void intel_drain_pasid_prq(struct device *dev, u32 pasid)
QI_DEV_IOTLB_PFSID(info->pfsid);
qi_retry:
reinit_completion(&iommu->prq_complete);
- qi_submit_sync(iommu, desc, 3, QI_OPT_WAIT_DRAIN);
+ qi_submit_sync(iommu, desc, 3, QI_OPT_WAIT_DRAIN, NULL);
if (readl(iommu->reg + DMAR_PRS_REG) & DMA_PRS_PRO) {
wait_for_completion(&iommu->prq_complete);
goto qi_retry;
@@ -646,7 +646,7 @@ static void handle_bad_prq_event(struct intel_iommu *iommu,
desc.qw3 = 0;
}
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
static irqreturn_t prq_event_thread(int irq, void *d)
@@ -811,7 +811,7 @@ int intel_svm_page_response(struct device *dev,
ktime_to_ns(ktime_get()) - prm->private_data[0]);
}
- qi_submit_sync(iommu, &desc, 1, 0);
+ qi_submit_sync(iommu, &desc, 1, 0, NULL);
}
out:
return ret;
--
2.34.1
This adds the data structure invalidating caches for the nested domain
allocated with IOMMU_HWPT_DATA_VTD_S1 type.
Signed-off-by: Lu Baolu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
include/uapi/linux/iommufd.h | 55 ++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 824560c50ec6..2067aa00d2a3 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -623,6 +623,61 @@ enum iommu_hwpt_invalidate_data_type {
IOMMU_HWPT_INVALIDATE_DATA_VTD_S1,
};
+/**
+ * enum iommu_hwpt_vtd_s1_invalidate_flags - Flags for Intel VT-d
+ * stage-1 cache invalidation
+ * @IOMMU_VTD_INV_FLAGS_LEAF: Indicates whether the invalidation applies
+ * to all-levels page structure cache or just
+ * the leaf PTE cache.
+ */
+enum iommu_hwpt_vtd_s1_invalidate_flags {
+ IOMMU_VTD_INV_FLAGS_LEAF = 1 << 0,
+};
+
+/**
+ * enum iommu_hwpt_vtd_s1_invalidate_error - Hardware error of invalidation
+ * @IOMMU_HWPT_INVALIDATE_VTD_S1_ICE: Invalidation Completion Error, details
+ * refer to 11.4.7.1 Fault Status Register
+ * of VT-d specification.
+ * @IOMMU_HWPT_INVALIDATE_VTD_S1_ITE: Invalidation Time-out Error, details
+ * refer to 11.4.7.1 Fault Status Register
+ * of VT-d specification.
+ */
+enum iommu_hwpt_vtd_s1_invalidate_error {
+ IOMMU_HWPT_INVALIDATE_VTD_S1_ICE = 1 << 0,
+ IOMMU_HWPT_INVALIDATE_VTD_S1_ITE = 1 << 1,
+};
+
+/**
+ * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
+ * (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)
+ * @addr: The start address of the range to be invalidated. It needs to
+ * be 4KB aligned.
+ * @npages: Number of contiguous 4K pages to be invalidated.
+ * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
+ * @hw_error: One of enum iommu_hwpt_vtd_s1_invalidate_error
+ *
+ * The Intel VT-d specific invalidation data for user-managed stage-1 cache
+ * invalidation in nested translation. Userspace uses this structure to
+ * tell the impacted cache scope after modifying the stage-1 page table.
+ *
+ * Invalidating all the caches related to the page table by setting @addr
+ * to be 0 and @npages to be U64_MAX.
+ *
+ * The device TLB will be invalidated automatically if ATS is enabled.
+ *
+ * The @hw_error is meaningful when the entry is handled by the kernel.
+ * Check the entry_num output of IOMMU_HWPT_INVALIDATE ioctl to know the
+ * handled entries. @hw_error only covers the errors detected by hardware.
+ * The software detected errors would go through the normal ioctl errno.
+ */
+struct iommu_hwpt_vtd_s1_invalidate {
+ __aligned_u64 addr;
+ __aligned_u64 npages;
+ __u32 flags;
+ __u32 hw_error;
+};
+
/**
* struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
* @size: sizeof(struct iommu_hwpt_invalidate)
--
2.34.1
From: Lu Baolu <[email protected]>
This makes the pasid based cache invalidation and device TLB invalidation
to return QI faults to callers. This is needed when usersapce invalidates
cache after modifying the stage-1 page table used in nested translation.
Hardware errors during invalidation should be reported to user.
Signed-off-by: Lu Baolu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
drivers/iommu/intel/dmar.c | 13 +++++++------
drivers/iommu/intel/iommu.c | 12 ++++++------
drivers/iommu/intel/iommu.h | 6 +++---
drivers/iommu/intel/pasid.c | 12 +++++++-----
drivers/iommu/intel/svm.c | 8 ++++----
5 files changed, 27 insertions(+), 24 deletions(-)
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 701705b3a8ea..91635bd6493d 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -1527,7 +1527,7 @@ void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
}
void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
- u16 qdep, u64 addr, unsigned mask)
+ u16 qdep, u64 addr, unsigned mask, u32 *fault)
{
struct qi_desc desc;
@@ -1554,12 +1554,12 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
desc.qw2 = 0;
desc.qw3 = 0;
- qi_submit_sync(iommu, &desc, 1, 0, NULL);
+ qi_submit_sync(iommu, &desc, 1, 0, fault);
}
/* PASID-based IOTLB invalidation */
void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid, u64 addr,
- unsigned long npages, bool ih)
+ unsigned long npages, bool ih, u32 *fault)
{
struct qi_desc desc = {.qw2 = 0, .qw3 = 0};
@@ -1595,12 +1595,13 @@ void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid, u64 addr,
QI_EIOTLB_AM(mask);
}
- qi_submit_sync(iommu, &desc, 1, 0, NULL);
+ qi_submit_sync(iommu, &desc, 1, 0, fault);
}
/* PASID-based device IOTLB Invalidate */
void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid, u16 pfsid,
- u32 pasid, u16 qdep, u64 addr, unsigned int size_order)
+ u32 pasid, u16 qdep, u64 addr,
+ unsigned int size_order, u32 *fault)
{
unsigned long mask = 1UL << (VTD_PAGE_SHIFT + size_order - 1);
struct qi_desc desc = {.qw1 = 0, .qw2 = 0, .qw3 = 0};
@@ -1648,7 +1649,7 @@ void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid, u16 pfsid,
desc.qw1 |= QI_DEV_EIOTLB_SIZE;
}
- qi_submit_sync(iommu, &desc, 1, 0, NULL);
+ qi_submit_sync(iommu, &desc, 1, 0, fault);
}
void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 897159dba47d..68e494f1d03a 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1462,7 +1462,7 @@ static void __iommu_flush_dev_iotlb(struct device_domain_info *info,
sid = info->bus << 8 | info->devfn;
qdep = info->ats_qdep;
qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
- qdep, addr, mask);
+ qdep, addr, mask, NULL);
quirk_extra_dev_tlb_flush(info, addr, mask, IOMMU_NO_PASID, qdep);
}
@@ -1490,7 +1490,7 @@ static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
PCI_DEVID(info->bus, info->devfn),
info->pfsid, dev_pasid->pasid,
info->ats_qdep, addr,
- mask);
+ mask, NULL);
}
spin_unlock_irqrestore(&domain->lock, flags);
}
@@ -1505,10 +1505,10 @@ static void domain_flush_pasid_iotlb(struct intel_iommu *iommu,
spin_lock_irqsave(&domain->lock, flags);
list_for_each_entry(dev_pasid, &domain->dev_pasids, link_domain)
- qi_flush_piotlb(iommu, did, dev_pasid->pasid, addr, npages, ih);
+ qi_flush_piotlb(iommu, did, dev_pasid->pasid, addr, npages, ih, NULL);
if (!list_empty(&domain->devices))
- qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, npages, ih);
+ qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, npages, ih, NULL);
spin_unlock_irqrestore(&domain->lock, flags);
}
@@ -5195,10 +5195,10 @@ void quirk_extra_dev_tlb_flush(struct device_domain_info *info,
sid = PCI_DEVID(info->bus, info->devfn);
if (pasid == IOMMU_NO_PASID) {
qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
- qdep, address, mask);
+ qdep, address, mask, NULL);
} else {
qi_flush_dev_iotlb_pasid(info->iommu, sid, info->pfsid,
- pasid, qdep, address, mask);
+ pasid, qdep, address, mask, NULL);
}
}
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index c6de958e4f54..ce9bd08dcd05 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -866,14 +866,14 @@ void qi_flush_context(struct intel_iommu *iommu, u16 did,
void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
unsigned int size_order, u64 type);
void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
- u16 qdep, u64 addr, unsigned mask);
+ u16 qdep, u64 addr, unsigned mask, u32 *fault);
void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid, u64 addr,
- unsigned long npages, bool ih);
+ unsigned long npages, bool ih, u32 *fault);
void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid, u16 pfsid,
u32 pasid, u16 qdep, u64 addr,
- unsigned int size_order);
+ unsigned int size_order, u32 *fault);
void quirk_extra_dev_tlb_flush(struct device_domain_info *info,
unsigned long address, unsigned long pages,
u32 pasid, u16 qdep);
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index 67f924760ba8..4a7fe551d8a6 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -492,9 +492,11 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
* efficient to flush devTLB specific to the PASID.
*/
if (pasid == IOMMU_NO_PASID)
- qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
+ qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0,
+ 64 - VTD_PAGE_SHIFT, NULL);
else
- qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT);
+ qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0,
+ 64 - VTD_PAGE_SHIFT, NULL);
}
void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
@@ -521,7 +523,7 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
if (pgtt == PASID_ENTRY_PGTT_PT || pgtt == PASID_ENTRY_PGTT_FL_ONLY)
- qi_flush_piotlb(iommu, did, pasid, 0, -1, 0);
+ qi_flush_piotlb(iommu, did, pasid, 0, -1, 0, NULL);
else
iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH);
@@ -543,7 +545,7 @@ static void pasid_flush_caches(struct intel_iommu *iommu,
if (cap_caching_mode(iommu->cap)) {
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
- qi_flush_piotlb(iommu, did, pasid, 0, -1, 0);
+ qi_flush_piotlb(iommu, did, pasid, 0, -1, 0, NULL);
} else {
iommu_flush_write_buffer(iommu);
}
@@ -834,7 +836,7 @@ void intel_pasid_setup_page_snoop_control(struct intel_iommu *iommu,
* Addr[63:12]=0x7FFFFFFF_FFFFF) to affected functions
*/
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
- qi_flush_piotlb(iommu, did, pasid, 0, -1, 0);
+ qi_flush_piotlb(iommu, did, pasid, 0, -1, 0, NULL);
/* Device IOTLB doesn't need to be flushed in caching mode. */
if (!cap_caching_mode(iommu->cap))
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 660d049ad5b6..bf7b4c5c21f4 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -179,11 +179,11 @@ static void __flush_svm_range_dev(struct intel_svm *svm,
if (WARN_ON(!pages))
return;
- qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, address, pages, ih);
+ qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, address, pages, ih, NULL);
if (info->ats_enabled) {
qi_flush_dev_iotlb_pasid(sdev->iommu, sdev->sid, info->pfsid,
svm->pasid, sdev->qdep, address,
- order_base_2(pages));
+ order_base_2(pages), NULL);
quirk_extra_dev_tlb_flush(info, address, order_base_2(pages),
svm->pasid, sdev->qdep);
}
@@ -225,11 +225,11 @@ static void intel_flush_svm_all(struct intel_svm *svm)
list_for_each_entry_rcu(sdev, &svm->devs, list) {
info = dev_iommu_priv_get(sdev->dev);
- qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, 0, -1UL, 0);
+ qi_flush_piotlb(sdev->iommu, sdev->did, svm->pasid, 0, -1UL, 0, NULL);
if (info->ats_enabled) {
qi_flush_dev_iotlb_pasid(sdev->iommu, sdev->sid, info->pfsid,
svm->pasid, sdev->qdep,
- 0, 64 - VTD_PAGE_SHIFT);
+ 0, 64 - VTD_PAGE_SHIFT, NULL);
quirk_extra_dev_tlb_flush(info, 0, 64 - VTD_PAGE_SHIFT,
svm->pasid, sdev->qdep);
}
--
2.34.1
From: Lu Baolu <[email protected]>
This implements the .cache_invalidate_user() callback to support iotlb
flush for nested domain.
Signed-off-by: Lu Baolu <[email protected]>
Co-developed-by: Yi Liu <[email protected]>
Signed-off-by: Yi Liu <[email protected]>
---
drivers/iommu/intel/nested.c | 118 +++++++++++++++++++++++++++++++++++
1 file changed, 118 insertions(+)
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index b5a5563ab32c..cc9887a68318 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -73,9 +73,127 @@ static void intel_nested_domain_free(struct iommu_domain *domain)
kfree(to_dmar_domain(domain));
}
+static void nested_flush_pasid_iotlb(struct intel_iommu *iommu,
+ struct dmar_domain *domain, u64 addr,
+ unsigned long npages, bool ih)
+{
+ u16 did = domain_id_iommu(domain, iommu);
+ unsigned long flags;
+
+ spin_lock_irqsave(&domain->lock, flags);
+ if (!list_empty(&domain->devices))
+ qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr,
+ npages, ih, NULL);
+ spin_unlock_irqrestore(&domain->lock, flags);
+}
+
+static void nested_flush_dev_iotlb(struct dmar_domain *domain, u64 addr,
+ unsigned mask, u32 *fault)
+{
+ struct device_domain_info *info;
+ unsigned long flags;
+ u16 sid, qdep;
+
+ spin_lock_irqsave(&domain->lock, flags);
+ list_for_each_entry(info, &domain->devices, link) {
+ if (!info->ats_enabled)
+ continue;
+ sid = info->bus << 8 | info->devfn;
+ qdep = info->ats_qdep;
+ qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
+ qdep, addr, mask, fault);
+ quirk_extra_dev_tlb_flush(info, addr, mask,
+ IOMMU_NO_PASID, qdep);
+ }
+ spin_unlock_irqrestore(&domain->lock, flags);
+}
+
+static void intel_nested_flush_cache(struct dmar_domain *domain, u64 addr,
+ unsigned long npages, bool ih, u32 *error)
+{
+ struct iommu_domain_info *info;
+ unsigned long i;
+ unsigned mask;
+ u32 fault;
+
+ xa_for_each(&domain->iommu_array, i, info)
+ nested_flush_pasid_iotlb(info->iommu, domain, addr, npages, ih);
+
+ if (!domain->has_iotlb_device)
+ return;
+
+ if (npages == U64_MAX)
+ mask = 64 - VTD_PAGE_SHIFT;
+ else
+ mask = ilog2(__roundup_pow_of_two(npages));
+
+ nested_flush_dev_iotlb(domain, addr, mask, &fault);
+
+ /*
+ * Invalidation queue error (i.e. IQE) will not be reported to user
+ * as it's caused only by driver internal bug.
+ */
+ if (fault & DMA_FSTS_ICE)
+ *error |= IOMMU_HWPT_INVALIDATE_VTD_S1_ICE;
+ if (fault & DMA_FSTS_ITE)
+ *error |= IOMMU_HWPT_INVALIDATE_VTD_S1_ITE;
+}
+
+static int intel_nested_cache_invalidate_user(struct iommu_domain *domain,
+ struct iommu_user_data_array *array)
+{
+ struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+ struct iommu_hwpt_vtd_s1_invalidate inv_entry;
+ u32 processed = 0;
+ int ret = 0;
+ u32 index;
+
+ if (array->type != IOMMU_HWPT_INVALIDATE_DATA_VTD_S1) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ for (index = 0; index < array->entry_num; index++) {
+ ret = iommu_copy_struct_from_user_array(&inv_entry, array,
+ IOMMU_HWPT_INVALIDATE_DATA_VTD_S1,
+ index, hw_error);
+ if (ret)
+ break;
+
+ if (inv_entry.flags & ~IOMMU_VTD_INV_FLAGS_LEAF) {
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ if (!IS_ALIGNED(inv_entry.addr, VTD_PAGE_SIZE) ||
+ ((inv_entry.npages == U64_MAX) && inv_entry.addr)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ intel_nested_flush_cache(dmar_domain, inv_entry.addr,
+ inv_entry.npages,
+ inv_entry.flags & IOMMU_VTD_INV_FLAGS_LEAF,
+ &inv_entry.hw_error);
+
+ ret = iommu_respond_struct_to_user_array(array, index,
+ (void *)&inv_entry,
+ sizeof(inv_entry));
+ if (ret)
+ break;
+
+ processed++;
+ }
+
+out:
+ array->entry_num = processed;
+ return ret;
+}
+
static const struct iommu_domain_ops intel_nested_domain_ops = {
.attach_dev = intel_nested_attach_dev,
.free = intel_nested_domain_free,
+ .cache_invalidate_user = intel_nested_cache_invalidate_user,
};
struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *parent,
--
2.34.1
On Wed, Dec 27, 2023 at 08:13:44AM -0800, Yi Liu wrote:
> [2] https://github.com/yiliu1765/iommufd/tree/iommufd_nesting
This branch is still pointing to v7's iommufd_nesting-12212023-yi.
Likely you should update it to v8's iommufd_nesting-12272023-yi :)
Thanks
Nic
On 2023/12/28 04:58, Nicolin Chen wrote:
> On Wed, Dec 27, 2023 at 08:13:44AM -0800, Yi Liu wrote:
>
>> [2] https://github.com/yiliu1765/iommufd/tree/iommufd_nesting
>
> This branch is still pointing to v7's iommufd_nesting-12212023-yi.
> Likely you should update it to v8's iommufd_nesting-12272023-yi :)
>
yes, it is. done! :)
--
Regards,
Yi Liu
> From: Liu, Yi L <[email protected]>
> Sent: Thursday, December 28, 2023 12:14 AM
>
> In nested translation, the stage-1 page table is user-managed but cached
> by the IOMMU hardware, so an update on present page table entries in the
> stage-1 page table should be followed with a cache invalidation.
>
> Add an IOMMU_HWPT_INVALIDATE ioctl to support such a cache
> invalidation.
> It takes hwpt_id to specify the iommu_domain, and a multi-entry array to
> support multiple invalidation data in one ioctl.
>
> enum iommu_hwpt_invalidate_data_type is defined to tag the data type of
> the entries in the multi-entry array.
>
> Co-developed-by: Nicolin Chen <[email protected]>
> Signed-off-by: Nicolin Chen <[email protected]>
> Signed-off-by: Yi Liu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
> From: Liu, Yi L <[email protected]>
> Sent: Thursday, December 28, 2023 12:14 AM
>
> + /* Negative test: trigger error */
> + num_inv = 1;
> + inv_reqs[0].flags =
> IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR;
> + inv_reqs[0].iotlb_id = 0;
> + test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
> +
> IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
> + sizeof(*inv_reqs), &num_inv);
> + assert(num_inv == 1);
> + assert(inv_reqs[0].hw_error ==
> IOMMU_TEST_INVALIDATE_FAKE_ERROR);
> +
instead of removing TRIGGER_ERROR|ALL err check, it makes more
sense to keep it but making it a similar case as above.
> From: Liu, Yi L <[email protected]>
> Sent: Thursday, December 28, 2023 12:14 AM
>
> @@ -1376,6 +1383,8 @@ int qi_submit_sync(struct intel_iommu *iommu,
> struct qi_desc *desc,
>
> restart:
> rc = 0;
> + if (fault)
> + *fault = 0;
move it to right before the loop of qi_check_fault()
>
> raw_spin_lock_irqsave(&qi->q_lock, flags);
> /*
> @@ -1430,7 +1439,7 @@ int qi_submit_sync(struct intel_iommu *iommu,
> struct qi_desc *desc,
> * a deadlock where the interrupt context can wait
> indefinitely
> * for free slots in the queue.
> */
> - rc = qi_check_fault(iommu, index, wait_index);
> + rc = qi_check_fault(iommu, index, wait_index, fault);
> if (rc)
> break;
and as replied in another thread let's change qi_check_fault to return
-ETIMEDOUT to break the restart loop when fault pointer is valid.
> From: Liu, Yi L <[email protected]>
> Sent: Thursday, December 28, 2023 12:14 AM
>
> From: Lu Baolu <[email protected]>
>
> This makes the pasid based cache invalidation and device TLB invalidation
> to return QI faults to callers. This is needed when usersapce invalidates
> cache after modifying the stage-1 page table used in nested translation.
> Hardware errors during invalidation should be reported to user.
>
> Signed-off-by: Lu Baolu <[email protected]>
> Signed-off-by: Yi Liu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
> From: Liu, Yi L <[email protected]>
> Sent: Thursday, December 28, 2023 12:14 AM
> +/**
> + * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
> + * (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)
> + * @addr: The start address of the range to be invalidated. It needs to
> + * be 4KB aligned.
> + * @npages: Number of contiguous 4K pages to be invalidated.
> + * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
> + * @hw_error: One of enum iommu_hwpt_vtd_s1_invalidate_error
> + *
> + * The Intel VT-d specific invalidation data for user-managed stage-1 cache
> + * invalidation in nested translation. Userspace uses this structure to
> + * tell the impacted cache scope after modifying the stage-1 page table.
> + *
> + * Invalidating all the caches related to the page table by setting @addr
> + * to be 0 and @npages to be U64_MAX.
> + *
> + * The device TLB will be invalidated automatically if ATS is enabled.
> + *
> + * The @hw_error is meaningful when the entry is handled by the kernel.
> + * Check the entry_num output of IOMMU_HWPT_INVALIDATE ioctl to
> know the
> + * handled entries. @hw_error only covers the errors detected by hardware.
> + * The software detected errors would go through the normal ioctl errno.
> + */
* An entry is considered 'handled' after it passes the audit and submitted
* to the IOMMU by the underlying driver. Check the @entry_num output of
* struct iommu_hwpt_invalidate for the number of handled entries. A 'handled'
* request may still fail in hardware for various reasons, e.g. due to timeout
* on waiting for device response upon a device TLB invalidation request. In
* such case the hardware error info is reported in the @hw_error field of the
* handled entry.
> From: Tian, Kevin
> Sent: Thursday, December 28, 2023 2:38 PM
>
> > From: Liu, Yi L <[email protected]>
> > Sent: Thursday, December 28, 2023 12:14 AM
> > +/**
> > + * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
> > + * (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)
> > + * @addr: The start address of the range to be invalidated. It needs to
> > + * be 4KB aligned.
> > + * @npages: Number of contiguous 4K pages to be invalidated.
> > + * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
> > + * @hw_error: One of enum iommu_hwpt_vtd_s1_invalidate_error
> > + *
> > + * The Intel VT-d specific invalidation data for user-managed stage-1 cache
> > + * invalidation in nested translation. Userspace uses this structure to
> > + * tell the impacted cache scope after modifying the stage-1 page table.
> > + *
> > + * Invalidating all the caches related to the page table by setting @addr
> > + * to be 0 and @npages to be U64_MAX.
> > + *
> > + * The device TLB will be invalidated automatically if ATS is enabled.
> > + *
> > + * The @hw_error is meaningful when the entry is handled by the kernel.
> > + * Check the entry_num output of IOMMU_HWPT_INVALIDATE ioctl to
> > know the
> > + * handled entries. @hw_error only covers the errors detected by
> hardware.
> > + * The software detected errors would go through the normal ioctl errno.
> > + */
>
> * An entry is considered 'handled' after it passes the audit and submitted
> * to the IOMMU by the underlying driver. Check the @entry_num output of
> * struct iommu_hwpt_invalidate for the number of handled entries. A
> 'handled'
> * request may still fail in hardware for various reasons, e.g. due to timeout
> * on waiting for device response upon a device TLB invalidation request. In
> * such case the hardware error info is reported in the @hw_error field of the
> * handled entry.
with that:
Reviewed-by: Kevin Tian <[email protected]>
> From: Liu, Yi L <[email protected]>
> Sent: Thursday, December 28, 2023 12:14 AM
>
>
> +static void nested_flush_pasid_iotlb(struct intel_iommu *iommu,
> + struct dmar_domain *domain, u64 addr,
> + unsigned long npages, bool ih)
> +{
> + u16 did = domain_id_iommu(domain, iommu);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&domain->lock, flags);
> + if (!list_empty(&domain->devices))
> + qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr,
> + npages, ih, NULL);
Not sure the check of domain->devices makes sense here. The outer
loop is xa_for_each(&domain->iommu_array, i, info) which, if found,
then implies certain devices behind this iommu must be attached to
this domain.
I wonder whether it's clearer to remove this function and just call
qi_flush_piotlb() from intel_nested_flush_cache().
> +
> + /*
> + * Invalidation queue error (i.e. IQE) will not be reported to user
> + * as it's caused only by driver internal bug.
> + */
here lack of:
*error = 0;
> + if (fault & DMA_FSTS_ICE)
> + *error |= IOMMU_HWPT_INVALIDATE_VTD_S1_ICE;
> + if (fault & DMA_FSTS_ITE)
> + *error |= IOMMU_HWPT_INVALIDATE_VTD_S1_ITE;
> +}
> +
On 2023/12/28 14:14, Tian, Kevin wrote:
>> From: Liu, Yi L <[email protected]>
>> Sent: Thursday, December 28, 2023 12:14 AM
>>
>> + /* Negative test: trigger error */
>> + num_inv = 1;
>> + inv_reqs[0].flags =
>> IOMMU_TEST_INVALIDATE_FLAG_TRIGGER_ERROR;
>> + inv_reqs[0].iotlb_id = 0;
>> + test_cmd_hwpt_invalidate(nested_hwpt_id[0], inv_reqs,
>> +
>> IOMMU_HWPT_INVALIDATE_DATA_SELFTEST,
>> + sizeof(*inv_reqs), &num_inv);
>> + assert(num_inv == 1);
>> + assert(inv_reqs[0].hw_error ==
>> IOMMU_TEST_INVALIDATE_FAKE_ERROR);
>> +
>
> instead of removing TRIGGER_ERROR|ALL err check, it makes more
> sense to keep it but making it a similar case as above.
yeah, but the config of TRIGGER_ERROR|ALL would be valid. is it?
Your point is to add another test case to see if "error" is generated
even if there is other flags set. is it?
--
Regards,
Yi Liu
On 2023/12/28 14:17, Tian, Kevin wrote:
>> From: Liu, Yi L <[email protected]>
>> Sent: Thursday, December 28, 2023 12:14 AM
>>
>> @@ -1376,6 +1383,8 @@ int qi_submit_sync(struct intel_iommu *iommu,
>> struct qi_desc *desc,
>>
>> restart:
>> rc = 0;
>> + if (fault)
>> + *fault = 0;
>
> move it to right before the loop of qi_check_fault()
ok.
>>
>> raw_spin_lock_irqsave(&qi->q_lock, flags);
>> /*
>> @@ -1430,7 +1439,7 @@ int qi_submit_sync(struct intel_iommu *iommu,
>> struct qi_desc *desc,
>> * a deadlock where the interrupt context can wait
>> indefinitely
>> * for free slots in the queue.
>> */
>> - rc = qi_check_fault(iommu, index, wait_index);
>> + rc = qi_check_fault(iommu, index, wait_index, fault);
>> if (rc)
>> break;
>
> and as replied in another thread let's change qi_check_fault to return
> -ETIMEDOUT to break the restart loop when fault pointer is valid.
sure.
--
Regards,
Yi Liu
On 2023/12/28 14:38, Tian, Kevin wrote:
>> From: Tian, Kevin
>> Sent: Thursday, December 28, 2023 2:38 PM
>>
>>> From: Liu, Yi L <[email protected]>
>>> Sent: Thursday, December 28, 2023 12:14 AM
>>> +/**
>>> + * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
>>> + * (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)
>>> + * @addr: The start address of the range to be invalidated. It needs to
>>> + * be 4KB aligned.
>>> + * @npages: Number of contiguous 4K pages to be invalidated.
>>> + * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
>>> + * @hw_error: One of enum iommu_hwpt_vtd_s1_invalidate_error
>>> + *
>>> + * The Intel VT-d specific invalidation data for user-managed stage-1 cache
>>> + * invalidation in nested translation. Userspace uses this structure to
>>> + * tell the impacted cache scope after modifying the stage-1 page table.
>>> + *
>>> + * Invalidating all the caches related to the page table by setting @addr
>>> + * to be 0 and @npages to be U64_MAX.
>>> + *
>>> + * The device TLB will be invalidated automatically if ATS is enabled.
>>> + *
>>> + * The @hw_error is meaningful when the entry is handled by the kernel.
>>> + * Check the entry_num output of IOMMU_HWPT_INVALIDATE ioctl to
>>> know the
>>> + * handled entries. @hw_error only covers the errors detected by
>> hardware.
>>> + * The software detected errors would go through the normal ioctl errno.
>>> + */
>>
>> * An entry is considered 'handled' after it passes the audit and submitted
>> * to the IOMMU by the underlying driver. Check the @entry_num output of
>> * struct iommu_hwpt_invalidate for the number of handled entries. A
>> 'handled'
>> * request may still fail in hardware for various reasons, e.g. due to timeout
>> * on waiting for device response upon a device TLB invalidation request. In
>> * such case the hardware error info is reported in the @hw_error field of the
>> * handled entry.
>
> with that:
>
> Reviewed-by: Kevin Tian <[email protected]>
yep.
--
Regards,
Yi Liu
On 2023/12/28 15:11, Tian, Kevin wrote:
>> From: Liu, Yi L <[email protected]>
>> Sent: Thursday, December 28, 2023 12:14 AM
>>
>>
>> +static void nested_flush_pasid_iotlb(struct intel_iommu *iommu,
>> + struct dmar_domain *domain, u64 addr,
>> + unsigned long npages, bool ih)
>> +{
>> + u16 did = domain_id_iommu(domain, iommu);
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&domain->lock, flags);
>> + if (!list_empty(&domain->devices))
>> + qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr,
>> + npages, ih, NULL);
>
> Not sure the check of domain->devices makes sense here. The outer
> loop is xa_for_each(&domain->iommu_array, i, info) which, if found,
> then implies certain devices behind this iommu must be attached to
> this domain.
yes.
> I wonder whether it's clearer to remove this function and just call
> qi_flush_piotlb() from intel_nested_flush_cache().
yeah, with above remark, it would be more clear to call qi_flush_piotlb()
from intel_nested_flush_cache().
>> +
>> + /*
>> + * Invalidation queue error (i.e. IQE) will not be reported to user
>> + * as it's caused only by driver internal bug.
>> + */
>
> here lack of:
>
> *error = 0;
yes.
>> + if (fault & DMA_FSTS_ICE)
>> + *error |= IOMMU_HWPT_INVALIDATE_VTD_S1_ICE;
>> + if (fault & DMA_FSTS_ITE)
>> + *error |= IOMMU_HWPT_INVALIDATE_VTD_S1_ITE;
>> +}
>> +
--
Regards,
Yi Liu
On 12/28/23 2:17 PM, Tian, Kevin wrote:
>> raw_spin_lock_irqsave(&qi->q_lock, flags);
>> /*
>> @@ -1430,7 +1439,7 @@ int qi_submit_sync(struct intel_iommu *iommu,
>> struct qi_desc *desc,
>> * a deadlock where the interrupt context can wait
>> indefinitely
>> * for free slots in the queue.
>> */
>> - rc = qi_check_fault(iommu, index, wait_index);
>> + rc = qi_check_fault(iommu, index, wait_index, fault);
>> if (rc)
>> break;
> and as replied in another thread let's change qi_check_fault to return
> -ETIMEDOUT to break the restart loop when fault pointer is valid.
It's fine to break the retry loop when fault happens and the fault
pointer is valid. Please don't forget to add an explanation comment
around the code. Something like:
/*
* The caller is able to handle the fault by itself. The IOMMU driver
* should not attempt to retry this request.
*/
Best regards,
baolu
On 1/1/2024 11:34 AM, Baolu Lu wrote:
> On 12/28/23 2:17 PM, Tian, Kevin wrote:
>>> raw_spin_lock_irqsave(&qi->q_lock, flags);
>>> /*
>>> @@ -1430,7 +1439,7 @@ int qi_submit_sync(struct intel_iommu *iommu,
>>> struct qi_desc *desc,
>>> * a deadlock where the interrupt context can wait
>>> indefinitely
>>> * for free slots in the queue.
>>> */
>>> - rc = qi_check_fault(iommu, index, wait_index);
>>> + rc = qi_check_fault(iommu, index, wait_index, fault);
>>> if (rc)
>>> break;
>> and as replied in another thread let's change qi_check_fault to return
>> -ETIMEDOUT to break the restart loop when fault pointer is valid.
>
> It's fine to break the retry loop when fault happens and the fault
> pointer is valid. Please don't forget to add an explanation comment
> around the code. Something like:
>
> /*
> * The caller is able to handle the fault by itself. The IOMMU driver
> * should not attempt to retry this request.
> */
If caller could pass desc with mixed iotlb & devtlb invalidation request,
it would be problematic/difficult for caller or qi_submit_sync() to do
error handling, imagine a case like,
1. call qi_submit_sync() with iotlb & devltb.
2. qi_submit_sync() detects the target device is dead.
3. break the loop, or will block other invalidation submitter / hang.
4. it is hard for qi_submit_sync() to extract those iotlb invalidation
to retry.
5. it is also difficult for caller to retry the iotlb invalidation, or
leave iotlb out-of-sync. ---there is no sync at all, device is gone.
and if only ITE fault hit, but target device is there && configuration
space reading okay, the ITE is probably left by previous request for
other device, not triggered by this batch, the question is we couldn't
identify the ITE device is just the same as current target ? if the same,
then breaking out is reasonable, or just leave the problem to caller,
something in the request batch is bad, some requests someone request
befoere is bad, but the request is not from the same caller.
Thanks,
Ethan
>
> Best regards,
> baolu
>