Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> Once inside a request, inside the timeline->mutex, pinning is verboten.
>
> <4> [896.032829] ======================================================
> <4> [896.032831] WARNING: possible circular locking dependency detected
> <4> [896.032835] 5.4.0-rc8-CI-Patchwork_15533+ #1 Tainted: G U
> <4> [896.032838] ------------------------------------------------------
> <4> [896.032841] gem_exec_parall/3720 is trying to acquire lock:
> <4> [896.032844] ffff888401863270 (&kernel#2){+.+.}, at: i915_request_create+0x16/0x1c0 [i915]
> <4> [896.032915]
> but task is already holding lock:
> <4> [896.032917] ffff8883ec1c93c0 (&vm->mutex){+.+.}, at: i915_vma_pin+0xf3/0x11c0 [i915]
> <4> [896.032952]
> which lock already depends on the new lock.
>
> <4> [896.032954]
> the existing dependency chain (in reverse order) is:
> <4> [896.032956]
> -> #1 (&vm->mutex){+.+.}:
> <4> [896.032961] __mutex_lock+0x9a/0x9d0
> <4> [896.032995] i915_vma_pin+0xf3/0x11c0 [i915]
> <4> [896.033033] intel_renderstate_emit+0xb9/0x9e0 [i915]
> <4> [896.033081] i915_gem_init+0x5a9/0xa50 [i915]
> <4> [896.033112] i915_driver_probe+0xb00/0x15f0 [i915]
> <4> [896.033144] i915_pci_probe+0x43/0x1c0 [i915]
> <4> [896.033149] pci_device_probe+0x9e/0x120
> <4> [896.033154] really_probe+0xea/0x420
> <4> [896.033158] driver_probe_device+0x10b/0x120
> <4> [896.033161] device_driver_attach+0x4a/0x50
> <4> [896.033164] __driver_attach+0x97/0x130
> <4> [896.033168] bus_for_each_dev+0x74/0xc0
> <4> [896.033171] bus_add_driver+0x142/0x220
> <4> [896.033174] driver_register+0x56/0xf0
> <4> [896.033178] do_one_initcall+0x58/0x2ff
> <4> [896.033183] do_init_module+0x56/0x1f8
> <4> [896.033187] load_module+0x243e/0x29f0
> <4> [896.033190] __do_sys_finit_module+0xe9/0x110
> <4> [896.033194] do_syscall_64+0x4f/0x210
> <4> [896.033197] entry_SYSCALL_64_after_hwframe+0x49/0xbe
> <4> [896.033200]
> -> #0 (&kernel#2){+.+.}:
> <4> [896.033206] __lock_acquire+0x1328/0x15d0
> <4> [896.033209] lock_acquire+0xa7/0x1c0
> <4> [896.033213] __mutex_lock+0x9a/0x9d0
> <4> [896.033255] i915_request_create+0x16/0x1c0 [i915]
> <4> [896.033287] intel_engine_flush_barriers+0x4c/0x100 [i915]
> <4> [896.033327] ggtt_flush+0x37/0x60 [i915]
> <4> [896.033366] i915_gem_evict_something+0x46b/0x5a0 [i915]
> <4> [896.033407] i915_gem_gtt_insert+0x21d/0x6a0 [i915]
> <4> [896.033449] i915_vma_pin+0xb36/0x11c0 [i915]
> <4> [896.033488] gen6_ppgtt_pin+0xd5/0x170 [i915]
> <4> [896.033523] ring_context_pin+0x2e/0xc0 [i915]
> <4> [896.033554] __intel_context_do_pin+0x6b/0x190 [i915]
> <4> [896.033591] i915_gem_do_execbuffer+0x1814/0x26c0 [i915]
> <4> [896.033627] i915_gem_execbuffer2_ioctl+0x11b/0x460 [i915]
> <4> [896.033632] drm_ioctl_kernel+0xa7/0xf0
> <4> [896.033635] drm_ioctl+0x2e1/0x390
> <4> [896.033638] do_vfs_ioctl+0xa0/0x6f0
> <4> [896.033641] ksys_ioctl+0x35/0x60
> <4> [896.033644] __x64_sys_ioctl+0x11/0x20
> <4> [896.033647] do_syscall_64+0x4f/0x210
> <4> [896.033650] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> Lift the object allocation and pin prior to the request construction.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/intel_renderstate.c | 97 ++++++++++++---------
> drivers/gpu/drm/i915/gt/intel_renderstate.h | 17 +++-
> drivers/gpu/drm/i915/i915_gem.c | 8 +-
> 3 files changed, 78 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.c b/drivers/gpu/drm/i915/gt/intel_renderstate.c
> index c4edc35e7d89..5954ecc3207f 100644
> --- a/drivers/gpu/drm/i915/gt/intel_renderstate.c
> +++ b/drivers/gpu/drm/i915/gt/intel_renderstate.c
> @@ -29,16 +29,6 @@
> #include "intel_renderstate.h"
> #include "intel_ring.h"
>
> -struct intel_renderstate {
> - const struct intel_renderstate_rodata *rodata;
> - struct drm_i915_gem_object *obj;
> - struct i915_vma *vma;
> - u32 batch_offset;
> - u32 batch_size;
> - u32 aux_offset;
> - u32 aux_size;
> -};
> -
> static const struct intel_renderstate_rodata *
> render_state_get_rodata(const struct intel_engine_cs *engine)
> {
> @@ -84,11 +74,11 @@ static int render_state_setup(struct intel_renderstate *so,
> u32 *d;
> int ret;
>
> - ret = i915_gem_object_prepare_write(so->obj, &needs_clflush);
> + ret = i915_gem_object_prepare_write(so->vma->obj, &needs_clflush);
> if (ret)
> return ret;
>
> - d = kmap_atomic(i915_gem_object_get_dirty_page(so->obj, 0));
> + d = kmap_atomic(i915_gem_object_get_dirty_page(so->vma->obj, 0));
>
> while (i < rodata->batch_items) {
> u32 s = rodata->batch[i];
> @@ -166,7 +156,7 @@ static int render_state_setup(struct intel_renderstate *so,
>
> ret = 0;
> out:
> - i915_gem_object_finish_access(so->obj);
> + i915_gem_object_finish_access(so->vma->obj);
> return ret;
>
> err:
> @@ -177,61 +167,84 @@ static int render_state_setup(struct intel_renderstate *so,
>
> #undef OUT_BATCH
>
> -int intel_renderstate_emit(struct i915_request *rq)
> +int intel_renderstate_init(struct intel_renderstate *so,
> + struct intel_engine_cs *engine)
> {
> - struct intel_engine_cs *engine = rq->engine;
> - struct intel_renderstate so = {}; /* keep the compiler happy */
> + struct drm_i915_gem_object *obj;
> int err;
>
> - so.rodata = render_state_get_rodata(engine);
> - if (!so.rodata)
> + memset(so, 0, sizeof(*so));
> +
> + so->rodata = render_state_get_rodata(engine);
> + if (!so->rodata)
> return 0;
>
> - if (so.rodata->batch_items * 4 > PAGE_SIZE)
> + if (so->rodata->batch_items * 4 > PAGE_SIZE)
> return -EINVAL;
>
> - so.obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
> - if (IS_ERR(so.obj))
> - return PTR_ERR(so.obj);
> + obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
> + if (IS_ERR(obj))
> + return PTR_ERR(obj);
>
> - so.vma = i915_vma_instance(so.obj, &engine->gt->ggtt->vm, NULL);
> - if (IS_ERR(so.vma)) {
> - err = PTR_ERR(so.vma);
> + so->vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
> + if (IS_ERR(so->vma)) {
> + err = PTR_ERR(so->vma);
> goto err_obj;
> }
>
> - err = i915_vma_pin(so.vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
> + err = i915_vma_pin(so->vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
> if (err)
> goto err_vma;
>
> - err = render_state_setup(&so, rq->i915);
> + err = render_state_setup(so, engine->i915);
> if (err)
> goto err_unpin;
>
> + return 0;
> +
> +err_unpin:
> + i915_vma_unpin(so->vma);
> +err_vma:
> + i915_vma_close(so->vma);
> +err_obj:
> + i915_gem_object_put(obj);
> + so->vma = NULL;
> + return err;
> +}
> +
> +int intel_renderstate_emit(struct intel_renderstate *so,
> + struct i915_request *rq)
> +{
> + struct intel_engine_cs *engine = rq->engine;
> + int err;
> +
> + if (!so->vma)
> + return 0;
> +
> err = engine->emit_bb_start(rq,
> - so.batch_offset, so.batch_size,
> + so->batch_offset, so->batch_size,
> I915_DISPATCH_SECURE);
> if (err)
> - goto err_unpin;
> + return err;
>
> - if (so.aux_size > 8) {
> + if (so->aux_size > 8) {
> err = engine->emit_bb_start(rq,
> - so.aux_offset, so.aux_size,
> + so->aux_offset, so->aux_size,
> I915_DISPATCH_SECURE);
> if (err)
> - goto err_unpin;
> + return err;
> }
>
> - i915_vma_lock(so.vma);
> - err = i915_request_await_object(rq, so.vma->obj, false);
> + i915_vma_lock(so->vma);
> + err = i915_request_await_object(rq, so->vma->obj, false);
> if (err == 0)
> - err = i915_vma_move_to_active(so.vma, rq, 0);
> - i915_vma_unlock(so.vma);
> -err_unpin:
> - i915_vma_unpin(so.vma);
> -err_vma:
> - i915_vma_close(so.vma);
> -err_obj:
> - i915_gem_object_put(so.obj);
> + err = i915_vma_move_to_active(so->vma, rq, 0);
> + i915_vma_unlock(so->vma);
> +
> return err;
> }
> +
> +void intel_renderstate_fini(struct intel_renderstate *so)
> +{
> + i915_vma_unpin_and_release(&so->vma, 0);
> +}
> diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.h b/drivers/gpu/drm/i915/gt/intel_renderstate.h
> index 8d5079145054..5700be69a05a 100644
> --- a/drivers/gpu/drm/i915/gt/intel_renderstate.h
> +++ b/drivers/gpu/drm/i915/gt/intel_renderstate.h
> @@ -27,6 +27,8 @@
> #include <linux/types.h>
>
> struct i915_request;
> +struct intel_engine_cs;
> +struct i915_vma;
>
> struct intel_renderstate_rodata {
> const u32 *reloc;
> @@ -46,6 +48,19 @@ extern const struct intel_renderstate_rodata gen7_null_state;
> extern const struct intel_renderstate_rodata gen8_null_state;
> extern const struct intel_renderstate_rodata gen9_null_state;
>
> -int intel_renderstate_emit(struct i915_request *rq);
> +struct intel_renderstate {
> + const struct intel_renderstate_rodata *rodata;
> + struct i915_vma *vma;
> + u32 batch_offset;
> + u32 batch_size;
> + u32 aux_offset;
> + u32 aux_size;
> +};
> +
> +int intel_renderstate_init(struct intel_renderstate *so,
> + struct intel_engine_cs *engine);
> +int intel_renderstate_emit(struct intel_renderstate *so,
> + struct i915_request *rq);
> +void intel_renderstate_fini(struct intel_renderstate *so);
>
> #endif /* _INTEL_RENDERSTATE_H_ */
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 61395b03443e..d2c2d66bb5f2 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1071,9 +1071,14 @@ static int __intel_engines_record_defaults(struct intel_gt *gt)
> */
>
> for_each_engine(engine, gt, id) {
> + struct intel_renderstate so;
> struct intel_context *ce;
> struct i915_request *rq;
>
> + err = intel_renderstate_init(&so, engine);
> + if (err)
> + goto out;
> +
> /* We must be able to switch to something! */
> GEM_BUG_ON(!engine->kernel_context);
> engine->serial++; /* force the kernel context switch */
> @@ -1096,13 +1101,14 @@ static int __intel_engines_record_defaults(struct intel_gt *gt)
> if (err)
> goto err_rq;
>
> - err = intel_renderstate_emit(rq);
> + err = intel_renderstate_emit(&so, rq);
> if (err)
> goto err_rq;
>
> err_rq:
> requests[id] = i915_request_get(rq);
> i915_request_add(rq);
> + intel_renderstate_fini(&so);
> if (err)
> goto out;
> }
> --
> 2.24.0
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