/* Returns a vmap'd pointer to dst_obj, which the caller must unmap */
static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
struct drm_i915_gem_object *src_obj,
- u32 batch_start_offset,
- u32 batch_len,
+ u32 offset, u32 length,
bool *needs_clflush_after)
{
unsigned int src_needs_clflush;
src = ERR_PTR(-ENODEV);
if (src_needs_clflush &&
- i915_can_memcpy_from_wc(NULL, batch_start_offset, 0)) {
+ i915_can_memcpy_from_wc(NULL, offset, 0)) {
src = i915_gem_object_pin_map(src_obj, I915_MAP_WC);
if (!IS_ERR(src)) {
i915_memcpy_from_wc(dst,
- src + batch_start_offset,
- ALIGN(batch_len, 16));
+ src + offset,
+ ALIGN(length, 16));
i915_gem_object_unpin_map(src_obj);
}
}
if (IS_ERR(src)) {
void *ptr;
- int offset, n;
+ int x, n;
- offset = offset_in_page(batch_start_offset);
-
- /* We can avoid clflushing partial cachelines before the write
+ /*
+ * We can avoid clflushing partial cachelines before the write
* if we only every write full cache-lines. Since we know that
* both the source and destination are in multiples of
* PAGE_SIZE, we can simply round up to the next cacheline.
* validate up to the end of the batch.
*/
if (dst_needs_clflush & CLFLUSH_BEFORE)
- batch_len = roundup(batch_len,
- boot_cpu_data.x86_clflush_size);
+ length = round_up(length,
+ boot_cpu_data.x86_clflush_size);
ptr = dst;
- for (n = batch_start_offset >> PAGE_SHIFT; batch_len; n++) {
- int len = min_t(int, batch_len, PAGE_SIZE - offset);
+ x = offset_in_page(offset);
+ for (n = offset >> PAGE_SHIFT; length; n++) {
+ int len = min_t(int, length, PAGE_SIZE - x);
src = kmap_atomic(i915_gem_object_get_page(src_obj, n));
if (src_needs_clflush)
- drm_clflush_virt_range(src + offset, len);
- memcpy(ptr, src + offset, len);
+ drm_clflush_virt_range(src + x, len);
+ memcpy(ptr, src + x, len);
kunmap_atomic(src);
ptr += len;
- batch_len -= len;
- offset = 0;
+ length -= len;
+ x = 0;
}
}
}
static int check_bbstart(u32 *cmd, u32 offset, u32 length,
- u32 batch_len,
- u64 batch_start,
- u64 shadow_batch_start,
+ u32 batch_length,
+ u64 batch_addr,
+ u64 shadow_addr,
const unsigned long *jump_whitelist)
{
u64 jump_offset, jump_target;
return -EINVAL;
}
- jump_target = *(u64*)(cmd+1);
- jump_offset = jump_target - batch_start;
+ jump_target = *(u64 *)(cmd + 1);
+ jump_offset = jump_target - batch_addr;
/*
* Any underflow of jump_target is guaranteed to be outside the range
* of a u32, so >= test catches both too large and too small
*/
- if (jump_offset >= batch_len) {
+ if (jump_offset >= batch_length) {
DRM_DEBUG("CMD: BB_START to 0x%llx jumps out of BB\n",
jump_target);
return -EINVAL;
/*
* This cannot overflow a u32 because we already checked jump_offset
- * is within the BB, and the batch_len is a u32
+ * is within the BB, and the batch_length is a u32
*/
target_cmd_offset = lower_32_bits(jump_offset);
target_cmd_index = target_cmd_offset / sizeof(u32);
- *(u64*)(cmd + 1) = shadow_batch_start + target_cmd_offset;
+ *(u64 *)(cmd + 1) = shadow_addr + target_cmd_offset;
if (target_cmd_index == offset)
return 0;
}
static unsigned long *
-alloc_whitelist(struct drm_i915_private *i915, u32 batch_len)
+alloc_whitelist(struct drm_i915_private *i915, u32 batch_length)
{
unsigned long *jmp;
/*
- * We expect batch_len to be less than 256KiB for known users,
+ * We expect batch_length to be less than 256KiB for known users,
* i.e. we need at most an 8KiB bitmap allocation which should be
* reasonably cheap due to kmalloc caches.
*/
return NULL;
/* Prefer to report transient allocation failure rather than hit oom */
- jmp = bitmap_zalloc(DIV_ROUND_UP(batch_len, sizeof(u32)),
+ jmp = bitmap_zalloc(DIV_ROUND_UP(batch_length, sizeof(u32)),
GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
if (!jmp)
return ERR_PTR(-ENOMEM);
#define LENGTH_BIAS 2
/**
- * i915_parse_cmds() - parse a submitted batch buffer for privilege violations
+ * intel_engine_cmd_parser() - parse a batch buffer for privilege violations
* @engine: the engine on which the batch is to execute
- * @batch_obj: the batch buffer in question
- * @batch_start: Canonical base address of batch
- * @batch_start_offset: byte offset in the batch at which execution starts
- * @batch_len: length of the commands in batch_obj
- * @shadow_batch_obj: copy of the batch buffer in question
- * @shadow_batch_start: Canonical base address of shadow_batch_obj
+ * @batch: the batch buffer in question
+ * @batch_offset: byte offset in the batch at which execution starts
+ * @batch_length: length of the commands in batch_obj
+ * @shadow: validated copy of the batch buffer in question
*
* Parses the specified batch buffer looking for privilege violations as
* described in the overview.
*/
int intel_engine_cmd_parser(struct intel_engine_cs *engine,
- struct drm_i915_gem_object *batch_obj,
- u64 batch_start,
- u32 batch_start_offset,
- u32 batch_len,
- struct drm_i915_gem_object *shadow_batch_obj,
- u64 shadow_batch_start)
+ struct i915_vma *batch,
+ u32 batch_offset,
+ u32 batch_length,
+ struct i915_vma *shadow)
{
u32 *cmd, *batch_end, offset = 0;
struct drm_i915_cmd_descriptor default_desc = noop_desc;
const struct drm_i915_cmd_descriptor *desc = &default_desc;
bool needs_clflush_after = false;
unsigned long *jump_whitelist;
+ u64 batch_addr, shadow_addr;
int ret = 0;
- cmd = copy_batch(shadow_batch_obj, batch_obj,
- batch_start_offset, batch_len,
+ GEM_BUG_ON(!IS_ALIGNED(batch_offset, sizeof(*cmd)));
+ GEM_BUG_ON(!IS_ALIGNED(batch_length, sizeof(*cmd)));
+ GEM_BUG_ON(range_overflows_t(u64, batch_offset, batch_length,
+ batch->size));
+ GEM_BUG_ON(!batch_length);
+
+ cmd = copy_batch(shadow->obj, batch->obj,
+ batch_offset, batch_length,
&needs_clflush_after);
if (IS_ERR(cmd)) {
DRM_DEBUG("CMD: Failed to copy batch\n");
}
/* Defer failure until attempted use */
- jump_whitelist = alloc_whitelist(engine->i915, batch_len);
+ jump_whitelist = alloc_whitelist(engine->i915, batch_length);
+
+ shadow_addr = gen8_canonical_addr(shadow->node.start);
+ batch_addr = gen8_canonical_addr(batch->node.start + batch_offset);
/*
* We use the batch length as size because the shadow object is as
* large or larger and copy_batch() will write MI_NOPs to the extra
* space. Parsing should be faster in some cases this way.
*/
- batch_end = cmd + (batch_len / sizeof(*batch_end));
+ batch_end = cmd + batch_length / sizeof(*batch_end);
do {
u32 length;
if (desc->flags & CMD_DESC_FIXED)
length = desc->length.fixed;
else
- length = ((*cmd & desc->length.mask) + LENGTH_BIAS);
+ length = (*cmd & desc->length.mask) + LENGTH_BIAS;
if ((batch_end - cmd) < length) {
DRM_DEBUG("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n",
}
if (desc->cmd.value == MI_BATCH_BUFFER_START) {
- ret = check_bbstart(cmd, offset, length,
- batch_len, batch_start,
- shadow_batch_start,
+ ret = check_bbstart(cmd, offset, length, batch_length,
+ batch_addr, shadow_addr,
jump_whitelist);
if (ret)
} while (1);
if (needs_clflush_after) {
- void *ptr = page_mask_bits(shadow_batch_obj->mm.mapping);
+ void *ptr = page_mask_bits(shadow->obj->mm.mapping);
drm_clflush_virt_range(ptr, (void *)(cmd + 1) - ptr);
}
err:
if (!IS_ERR_OR_NULL(jump_whitelist))
kfree(jump_whitelist);
- i915_gem_object_unpin_map(shadow_batch_obj);
+ i915_gem_object_unpin_map(shadow->obj);
return ret;
}
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