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drm/i915: Kill DRI1 cliprects

Browse Source 
Passing cliprects into the kernel for it to re-execute the batch buffer
with different CMD_DRAWRECT died out long ago. As DRI1 support has been
removed from the kernel, we can now simply reject any execbuf trying to
use this "feature".

To keep Daniel happy with the prospect of being able to reuse these
fields in the next decade, continue to ensure that current userspace is
not passing garbage in through the dead fields.

v2: Fix the cliprects_ptr check

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2015-10-06 11:39:55 +01:00 committed by Daniel Vetter
parent 5763ff04dc
commit 2f5945bc90
2 changed files with 31 additions and 138 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

142
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -945,7 +945,21 @@ i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
if (exec->flags & __I915_EXEC_UNKNOWN_FLAGS)
return false;
return ((exec->batch_start_offset | exec->batch_len) & 0x7) == 0;
/* Kernel clipping was a DRI1 misfeature */
if (exec->num_cliprects || exec->cliprects_ptr)
return false;
if (exec->DR4 == 0xffffffff) {
DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
exec->DR4 = 0;
}
if (exec->DR1 || exec->DR4)
return false;
if ((exec->batch_start_offset | exec->batch_len) & 0x7)
return false;
return true;
}
static int
@ -1109,47 +1123,6 @@ i915_reset_gen7_sol_offsets(struct drm_device *dev,
return 0;
}
static int
i915_emit_box(struct drm_i915_gem_request *req,
struct drm_clip_rect *box,
int DR1, int DR4)
{
struct intel_engine_cs *ring = req->ring;
int ret;
if (box->y2 <= box->y1 || box->x2 <= box->x1 ||
box->y2 <= 0 || box->x2 <= 0) {
DRM_ERROR("Bad box %d,%d..%d,%d\n",
box->x1, box->y1, box->x2, box->y2);
return -EINVAL;
}
if (INTEL_INFO(ring->dev)->gen >= 4) {
ret = intel_ring_begin(req, 4);
if (ret)
return ret;
intel_ring_emit(ring, GFX_OP_DRAWRECT_INFO_I965);
intel_ring_emit(ring, (box->x1 & 0xffff) | box->y1 << 16);
intel_ring_emit(ring, ((box->x2 - 1) & 0xffff) | (box->y2 - 1) << 16);
intel_ring_emit(ring, DR4);
} else {
ret = intel_ring_begin(req, 6);
if (ret)
return ret;
intel_ring_emit(ring, GFX_OP_DRAWRECT_INFO);
intel_ring_emit(ring, DR1);
intel_ring_emit(ring, (box->x1 & 0xffff) | box->y1 << 16);
intel_ring_emit(ring, ((box->x2 - 1) & 0xffff) | (box->y2 - 1) << 16);
intel_ring_emit(ring, DR4);
intel_ring_emit(ring, 0);
}
intel_ring_advance(ring);
return 0;
}
static struct drm_i915_gem_object*
i915_gem_execbuffer_parse(struct intel_engine_cs *ring,
struct drm_i915_gem_exec_object2 *shadow_exec_entry,
@ -1208,65 +1181,21 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
struct drm_i915_gem_execbuffer2 *args,
struct list_head *vmas)
{
struct drm_clip_rect *cliprects = NULL;
struct drm_device *dev = params->dev;
struct intel_engine_cs *ring = params->ring;
struct drm_i915_private *dev_priv = dev->dev_private;
u64 exec_start, exec_len;
int instp_mode;
u32 instp_mask;
int i, ret = 0;
if (args->num_cliprects != 0) {
if (ring != &dev_priv->ring[RCS]) {
DRM_DEBUG("clip rectangles are only valid with the render ring\n");
return -EINVAL;
}
if (INTEL_INFO(dev)->gen >= 5) {
DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
return -EINVAL;
}
if (args->num_cliprects > UINT_MAX / sizeof(*cliprects)) {
DRM_DEBUG("execbuf with %u cliprects\n",
args->num_cliprects);
return -EINVAL;
}
cliprects = kcalloc(args->num_cliprects,
sizeof(*cliprects),
GFP_KERNEL);
if (cliprects == NULL) {
ret = -ENOMEM;
goto error;
}
if (copy_from_user(cliprects,
to_user_ptr(args->cliprects_ptr),
sizeof(*cliprects)*args->num_cliprects)) {
ret = -EFAULT;
goto error;
}
} else {
if (args->DR4 == 0xffffffff) {
DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
args->DR4 = 0;
}
if (args->DR1 || args->DR4 || args->cliprects_ptr) {
DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
return -EINVAL;
}
}
int ret;
ret = i915_gem_execbuffer_move_to_gpu(params->request, vmas);
if (ret)
goto error;
return ret;
ret = i915_switch_context(params->request);
if (ret)
goto error;
return ret;
WARN(params->ctx->ppgtt && params->ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
"%s didn't clear reload\n", ring->name);
@ -1279,22 +1208,19 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
case I915_EXEC_CONSTANTS_REL_SURFACE:
if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
ret = -EINVAL;
goto error;
return -EINVAL;
}
if (instp_mode != dev_priv->relative_constants_mode) {
if (INTEL_INFO(dev)->gen < 4) {
DRM_DEBUG("no rel constants on pre-gen4\n");
ret = -EINVAL;
goto error;
return -EINVAL;
}
if (INTEL_INFO(dev)->gen > 5 &&
instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
ret = -EINVAL;
goto error;
return -EINVAL;
}
/* The HW changed the meaning on this bit on gen6 */
@ -1304,15 +1230,14 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
break;
default:
DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
ret = -EINVAL;
goto error;
return -EINVAL;
}
if (ring == &dev_priv->ring[RCS] &&
instp_mode != dev_priv->relative_constants_mode) {
ret = intel_ring_begin(params->request, 4);
if (ret)
goto error;
return ret;
intel_ring_emit(ring, MI_NOOP);
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
@ -1326,42 +1251,25 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
ret = i915_reset_gen7_sol_offsets(dev, params->request);
if (ret)
goto error;
return ret;
}
exec_len = args->batch_len;
exec_start = params->batch_obj_vm_offset +
params->args_batch_start_offset;
if (cliprects) {
for (i = 0; i < args->num_cliprects; i++) {
ret = i915_emit_box(params->request, &cliprects[i],
args->DR1, args->DR4);
if (ret)
goto error;
ret = ring->dispatch_execbuffer(params->request,
exec_start, exec_len,
params->dispatch_flags);
if (ret)
goto error;
}
} else {
ret = ring->dispatch_execbuffer(params->request,
exec_start, exec_len,
params->dispatch_flags);
if (ret)
return ret;
}
trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);
i915_gem_execbuffer_move_to_active(vmas, params->request);
i915_gem_execbuffer_retire_commands(params);
error:
kfree(cliprects);
return ret;
return 0;
}
/**

15
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -902,21 +902,6 @@ int intel_execlists_submission(struct i915_execbuffer_params *params,
return -EINVAL;
}
if (args->num_cliprects != 0) {
DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
return -EINVAL;
} else {
if (args->DR4 == 0xffffffff) {
DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
args->DR4 = 0;
}
if (args->DR1 || args->DR4 || args->cliprects_ptr) {
DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
return -EINVAL;
}
}
if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
DRM_DEBUG("sol reset is gen7 only\n");
return -EINVAL;