drm/i915: Allow userspace to clone contexts on creation

A usecase arose out of handling context recovery in mesa, whereby they
wish to recreate a context with fresh logical state but preserving all
other details of the original. Currently, they create a new context and
iterate over which bits they want to copy across, but it would much more
convenient if they were able to just pass in a target context to clone
during creation. This essentially extends the setparam during creation
to pull the details from a target context instead of the user supplied
parameters.

The ideal here is that we don't expose control over anything more than
can be obtained via CONTEXT_PARAM. That is userspace retains explicit
control over all features, and this api is just convenience.

For example, you could replace

	struct context_param p = { .param = CONTEXT_PARAM_VM };

	param.ctx_id = old_id;
	gem_context_get_param(&p.param);

	new_id = gem_context_create();

	param.ctx_id = new_id;
	gem_context_set_param(&p.param);

	gem_vm_destroy(param.value); /* drop the ref to VM_ID handle */

with

	struct create_ext_param p = {
	  { .name = CONTEXT_CREATE_CLONE },
	  .clone_id = old_id,
	  .flags = CLONE_FLAGS_VM
	}
	new_id = gem_context_create_ext(&p);

and not have to worry about stray namespace pollution etc.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190521211134.16117-5-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index d391d47..24736fc 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -1723,8 +1723,214 @@ static int create_setparam(struct i915_user_extension __user *ext, void *data)
        return ctx_setparam(arg->fpriv, arg->ctx, &local.param);
 }
 
+static int clone_engines(struct i915_gem_context *dst,
+                        struct i915_gem_context *src)
+{
+       struct i915_gem_engines *e = i915_gem_context_lock_engines(src);
+       struct i915_gem_engines *clone;
+       bool user_engines;
+       unsigned long n;
+
+       clone = kmalloc(struct_size(e, engines, e->num_engines), GFP_KERNEL);
+       if (!clone)
+               goto err_unlock;
+
+       clone->i915 = dst->i915;
+       for (n = 0; n < e->num_engines; n++) {
+               if (!e->engines[n]) {
+                       clone->engines[n] = NULL;
+                       continue;
+               }
+
+               clone->engines[n] =
+                       intel_context_create(dst, e->engines[n]->engine);
+               if (!clone->engines[n]) {
+                       __free_engines(clone, n);
+                       goto err_unlock;
+               }
+       }
+       clone->num_engines = n;
+
+       user_engines = i915_gem_context_user_engines(src);
+       i915_gem_context_unlock_engines(src);
+
+       free_engines(dst->engines);
+       RCU_INIT_POINTER(dst->engines, clone);
+       if (user_engines)
+               i915_gem_context_set_user_engines(dst);
+       else
+               i915_gem_context_clear_user_engines(dst);
+       return 0;
+
+err_unlock:
+       i915_gem_context_unlock_engines(src);
+       return -ENOMEM;
+}
+
+static int clone_flags(struct i915_gem_context *dst,
+                      struct i915_gem_context *src)
+{
+       dst->user_flags = src->user_flags;
+       return 0;
+}
+
+static int clone_schedattr(struct i915_gem_context *dst,
+                          struct i915_gem_context *src)
+{
+       dst->sched = src->sched;
+       return 0;
+}
+
+static int clone_sseu(struct i915_gem_context *dst,
+                     struct i915_gem_context *src)
+{
+       struct i915_gem_engines *e = i915_gem_context_lock_engines(src);
+       struct i915_gem_engines *clone;
+       unsigned long n;
+       int err;
+
+       clone = dst->engines; /* no locking required; sole access */
+       if (e->num_engines != clone->num_engines) {
+               err = -EINVAL;
+               goto unlock;
+       }
+
+       for (n = 0; n < e->num_engines; n++) {
+               struct intel_context *ce = e->engines[n];
+
+               if (clone->engines[n]->engine->class != ce->engine->class) {
+                       /* Must have compatible engine maps! */
+                       err = -EINVAL;
+                       goto unlock;
+               }
+
+               /* serialises with set_sseu */
+               err = intel_context_lock_pinned(ce);
+               if (err)
+                       goto unlock;
+
+               clone->engines[n]->sseu = ce->sseu;
+               intel_context_unlock_pinned(ce);
+       }
+
+       err = 0;
+unlock:
+       i915_gem_context_unlock_engines(src);
+       return err;
+}
+
+static int clone_timeline(struct i915_gem_context *dst,
+                         struct i915_gem_context *src)
+{
+       if (src->timeline) {
+               GEM_BUG_ON(src->timeline == dst->timeline);
+
+               if (dst->timeline)
+                       i915_timeline_put(dst->timeline);
+               dst->timeline = i915_timeline_get(src->timeline);
+       }
+
+       return 0;
+}
+
+static int clone_vm(struct i915_gem_context *dst,
+                   struct i915_gem_context *src)
+{
+       struct i915_hw_ppgtt *ppgtt;
+
+       rcu_read_lock();
+       do {
+               ppgtt = READ_ONCE(src->ppgtt);
+               if (!ppgtt)
+                       break;
+
+               if (!kref_get_unless_zero(&ppgtt->ref))
+                       continue;
+
+               /*
+                * This ppgtt may have be reallocated between
+                * the read and the kref, and reassigned to a third
+                * context. In order to avoid inadvertent sharing
+                * of this ppgtt with that third context (and not
+                * src), we have to confirm that we have the same
+                * ppgtt after passing through the strong memory
+                * barrier implied by a successful
+                * kref_get_unless_zero().
+                *
+                * Once we have acquired the current ppgtt of src,
+                * we no longer care if it is released from src, as
+                * it cannot be reallocated elsewhere.
+                */
+
+               if (ppgtt == READ_ONCE(src->ppgtt))
+                       break;
+
+               i915_ppgtt_put(ppgtt);
+       } while (1);
+       rcu_read_unlock();
+
+       if (ppgtt) {
+               __assign_ppgtt(dst, ppgtt);
+               i915_ppgtt_put(ppgtt);
+       }
+
+       return 0;
+}
+
+static int create_clone(struct i915_user_extension __user *ext, void *data)
+{
+       static int (* const fn[])(struct i915_gem_context *dst,
+                                 struct i915_gem_context *src) = {
+#define MAP(x, y) [ilog2(I915_CONTEXT_CLONE_##x)] = y
+               MAP(ENGINES, clone_engines),
+               MAP(FLAGS, clone_flags),
+               MAP(SCHEDATTR, clone_schedattr),
+               MAP(SSEU, clone_sseu),
+               MAP(TIMELINE, clone_timeline),
+               MAP(VM, clone_vm),
+#undef MAP
+       };
+       struct drm_i915_gem_context_create_ext_clone local;
+       const struct create_ext *arg = data;
+       struct i915_gem_context *dst = arg->ctx;
+       struct i915_gem_context *src;
+       int err, bit;
+
+       if (copy_from_user(&local, ext, sizeof(local)))
+               return -EFAULT;
+
+       BUILD_BUG_ON(GENMASK(BITS_PER_TYPE(local.flags) - 1, ARRAY_SIZE(fn)) !=
+                    I915_CONTEXT_CLONE_UNKNOWN);
+
+       if (local.flags & I915_CONTEXT_CLONE_UNKNOWN)
+               return -EINVAL;
+
+       if (local.rsvd)
+               return -EINVAL;
+
+       rcu_read_lock();
+       src = __i915_gem_context_lookup_rcu(arg->fpriv, local.clone_id);
+       rcu_read_unlock();
+       if (!src)
+               return -ENOENT;
+
+       GEM_BUG_ON(src == dst);
+
+       for (bit = 0; bit < ARRAY_SIZE(fn); bit++) {
+               if (!(local.flags & BIT(bit)))
+                       continue;
+
+               err = fn[bit](dst, src);
+               if (err)
+                       return err;
+       }
+
+       return 0;
+}
+
 static const i915_user_extension_fn create_extensions[] = {
        [I915_CONTEXT_CREATE_EXT_SETPARAM] = create_setparam,
+       [I915_CONTEXT_CREATE_EXT_CLONE] = create_clone,
 };
 
 static bool client_is_banned(struct drm_i915_file_private *file_priv)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 957ba8e..62396d5 100644 (file)
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1624,6 +1624,21 @@ struct drm_i915_gem_context_create_ext_setparam {
        struct drm_i915_gem_context_param param;
 };
 
+struct drm_i915_gem_context_create_ext_clone {
+#define I915_CONTEXT_CREATE_EXT_CLONE 1
+       struct i915_user_extension base;
+       __u32 clone_id;
+       __u32 flags;
+#define I915_CONTEXT_CLONE_ENGINES     (1u << 0)
+#define I915_CONTEXT_CLONE_FLAGS       (1u << 1)
+#define I915_CONTEXT_CLONE_SCHEDATTR   (1u << 2)
+#define I915_CONTEXT_CLONE_SSEU                (1u << 3)
+#define I915_CONTEXT_CLONE_TIMELINE    (1u << 4)
+#define I915_CONTEXT_CLONE_VM          (1u << 5)
+#define I915_CONTEXT_CLONE_UNKNOWN -(I915_CONTEXT_CLONE_VM << 1)
+       __u64 rsvd;
+};
+
 struct drm_i915_gem_context_destroy {
        __u32 ctx_id;
        __u32 pad;