Re: [PATCH] drm/amdgpu: fix the gfx hang while use per-ib secure flag

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On Tue, Feb 25, 2020 at 8:58 AM Huang Rui <ray.huang@xxxxxxx> wrote:
>
> Since 6643ba1 frame control packets are only issued in presence of secure IB(s).
> This causes hangs on some hardware (eg: Raven1). This patch restores the
> unconditionnal frame control packets issuing, that's to keep the per-IB logic
> regarding the secure flag.
>
> Fixes: 6643ba1 drm/amdgpu: Move to a per-IB secure flag (TMZ)
>
> Reported-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@xxxxxxx>
> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>

Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c   | 41 +++++++++++++++++++-------------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h |  5 ++--
>  drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c   | 15 ++++++------
>  drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c    | 13 +++++-----
>  4 files changed, 43 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> index 4b2342d..9713a7d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> @@ -131,7 +131,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>         uint64_t fence_ctx;
>         uint32_t status = 0, alloc_size;
>         unsigned fence_flags = 0;
> -       bool secure;
> +       int secure = -1;
>
>         unsigned i;
>         int r = 0;
> @@ -216,7 +216,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>                 amdgpu_ring_emit_cntxcntl(ring, status);
>         }
>
> -       secure = false;
>         for (i = 0; i < num_ibs; ++i) {
>                 ib = &ibs[i];
>
> @@ -228,27 +227,37 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>                     !amdgpu_sriov_vf(adev)) /* for SRIOV preemption, Preamble CE ib must be inserted anyway */
>                         continue;
>
> -               /* If this IB is TMZ, add frame TMZ start packet,
> -                * else, turn off TMZ.
> -                */
> -               if (ib->flags & AMDGPU_IB_FLAGS_SECURE && ring->funcs->emit_tmz) {
> -                       if (!secure) {
> -                               secure = true;
> -                               amdgpu_ring_emit_tmz(ring, true);
> +               if (job && ring->funcs->emit_frame_cntl) {
> +                       if (secure == -1) {
> +                               if (ib->flags & AMDGPU_IB_FLAGS_SECURE) {
> +                                       secure = 1;
> +                                       amdgpu_ring_emit_frame_cntl(ring, true, true);
> +                               } else {
> +                                       secure = 0;
> +                                       amdgpu_ring_emit_frame_cntl(ring, true, false);
> +                               }
> +                       } else {
> +                               if (secure == 1 &&
> +                                   !(ib->flags & AMDGPU_IB_FLAGS_SECURE)) {
> +                                       secure = 0;
> +                                       amdgpu_ring_emit_frame_cntl(ring, false, true);
> +                                       amdgpu_ring_emit_frame_cntl(ring, true, false);
> +                               } else if (secure == 0 &&
> +                                          ib->flags & AMDGPU_IB_FLAGS_SECURE) {
> +                                       secure = 1;
> +                                       amdgpu_ring_emit_frame_cntl(ring, false, false);
> +                                       amdgpu_ring_emit_frame_cntl(ring, true, true);
> +                               }
>                         }
> -               } else if (secure) {
> -                       secure = false;
> -                       amdgpu_ring_emit_tmz(ring, false);
>                 }
>
>                 amdgpu_ring_emit_ib(ring, job, ib, status);
>                 status &= ~AMDGPU_HAVE_CTX_SWITCH;
>         }
>
> -       if (secure) {
> -               secure = false;
> -               amdgpu_ring_emit_tmz(ring, false);
> -       }
> +       if (job && ring->funcs->emit_frame_cntl)
> +               amdgpu_ring_emit_frame_cntl(ring, false,
> +                                           (secure == 1) ? true : false);
>
>  #ifdef CONFIG_X86_64
>         if (!(adev->flags & AMD_IS_APU))
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> index 24caff0..4d019d6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> @@ -166,7 +166,8 @@ struct amdgpu_ring_funcs {
>         void (*emit_reg_write_reg_wait)(struct amdgpu_ring *ring,
>                                         uint32_t reg0, uint32_t reg1,
>                                         uint32_t ref, uint32_t mask);
> -       void (*emit_tmz)(struct amdgpu_ring *ring, bool start);
> +       void (*emit_frame_cntl)(struct amdgpu_ring *ring, bool start,
> +                               bool secure);
>         /* priority functions */
>         void (*set_priority) (struct amdgpu_ring *ring,
>                               enum drm_sched_priority priority);
> @@ -247,7 +248,7 @@ struct amdgpu_ring {
>  #define amdgpu_ring_emit_wreg(r, d, v) (r)->funcs->emit_wreg((r), (d), (v))
>  #define amdgpu_ring_emit_reg_wait(r, d, v, m) (r)->funcs->emit_reg_wait((r), (d), (v), (m))
>  #define amdgpu_ring_emit_reg_write_reg_wait(r, d0, d1, v, m) (r)->funcs->emit_reg_write_reg_wait((r), (d0), (d1), (v), (m))
> -#define amdgpu_ring_emit_tmz(r, b) (r)->funcs->emit_tmz((r), (b))
> +#define amdgpu_ring_emit_frame_cntl(r, b, s) (r)->funcs->emit_frame_cntl((r), (b), (s))
>  #define amdgpu_ring_pad_ib(r, ib) ((r)->funcs->pad_ib((r), (ib)))
>  #define amdgpu_ring_init_cond_exec(r) (r)->funcs->init_cond_exec((r))
>  #define amdgpu_ring_patch_cond_exec(r,o) (r)->funcs->patch_cond_exec((r),(o))
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> index 7b61583..748ac35 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> @@ -256,7 +256,7 @@ static int gfx_v10_0_rlc_backdoor_autoload_enable(struct amdgpu_device *adev);
>  static int gfx_v10_0_wait_for_rlc_autoload_complete(struct amdgpu_device *adev);
>  static void gfx_v10_0_ring_emit_ce_meta(struct amdgpu_ring *ring, bool resume);
>  static void gfx_v10_0_ring_emit_de_meta(struct amdgpu_ring *ring, bool resume);
> -static void gfx_v10_0_ring_emit_tmz(struct amdgpu_ring *ring, bool start);
> +static void gfx_v10_0_ring_emit_frame_cntl(struct amdgpu_ring *ring, bool start, bool secure);
>
>  static void gfx10_kiq_set_resources(struct amdgpu_ring *kiq_ring, uint64_t queue_mask)
>  {
> @@ -4729,12 +4729,13 @@ static void gfx_v10_0_ring_emit_de_meta(struct amdgpu_ring *ring, bool resume)
>                                            sizeof(de_payload) >> 2);
>  }
>
> -static void gfx_v10_0_ring_emit_tmz(struct amdgpu_ring *ring, bool start)
> +static void gfx_v10_0_ring_emit_frame_cntl(struct amdgpu_ring *ring, bool start,
> +                                   bool secure)
>  {
> -       if (amdgpu_is_tmz(ring->adev)) {
> -               amdgpu_ring_write(ring, PACKET3(PACKET3_FRAME_CONTROL, 0));
> -               amdgpu_ring_write(ring, FRAME_TMZ | FRAME_CMD(start ? 0 : 1));
> -       }
> +       uint32_t v = secure ? FRAME_TMZ : 0;
> +
> +       amdgpu_ring_write(ring, PACKET3(PACKET3_FRAME_CONTROL, 0));
> +       amdgpu_ring_write(ring, v | FRAME_CMD(start ? 0 : 1));
>  }
>
>  static void gfx_v10_0_ring_emit_rreg(struct amdgpu_ring *ring, uint32_t reg)
> @@ -5188,7 +5189,7 @@ static const struct amdgpu_ring_funcs gfx_v10_0_ring_funcs_gfx = {
>         .init_cond_exec = gfx_v10_0_ring_emit_init_cond_exec,
>         .patch_cond_exec = gfx_v10_0_ring_emit_patch_cond_exec,
>         .preempt_ib = gfx_v10_0_ring_preempt_ib,
> -       .emit_tmz = gfx_v10_0_ring_emit_tmz,
> +       .emit_frame_cntl = gfx_v10_0_ring_emit_frame_cntl,
>         .emit_wreg = gfx_v10_0_ring_emit_wreg,
>         .emit_reg_wait = gfx_v10_0_ring_emit_reg_wait,
>         .emit_reg_write_reg_wait = gfx_v10_0_ring_emit_reg_write_reg_wait,
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> index 1c7a16b..fbde712 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -5230,12 +5230,13 @@ static void gfx_v9_0_ring_emit_de_meta(struct amdgpu_ring *ring)
>         amdgpu_ring_write_multiple(ring, (void *)&de_payload, sizeof(de_payload) >> 2);
>  }
>
> -static void gfx_v9_0_ring_emit_tmz(struct amdgpu_ring *ring, bool start)
> +static void gfx_v9_0_ring_emit_frame_cntl(struct amdgpu_ring *ring, bool start,
> +                                  bool secure)
>  {
> -       if (amdgpu_is_tmz(ring->adev)) {
> -               amdgpu_ring_write(ring, PACKET3(PACKET3_FRAME_CONTROL, 0));
> -               amdgpu_ring_write(ring, FRAME_TMZ | FRAME_CMD(start ? 0 : 1));
> -       }
> +       uint32_t v = secure ? FRAME_TMZ : 0;
> +
> +       amdgpu_ring_write(ring, PACKET3(PACKET3_FRAME_CONTROL, 0));
> +       amdgpu_ring_write(ring, v | FRAME_CMD(start ? 0 : 1));
>  }
>
>  static void gfx_v9_ring_emit_cntxcntl(struct amdgpu_ring *ring, uint32_t flags)
> @@ -6477,7 +6478,7 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_gfx = {
>         .emit_cntxcntl = gfx_v9_ring_emit_cntxcntl,
>         .init_cond_exec = gfx_v9_0_ring_emit_init_cond_exec,
>         .patch_cond_exec = gfx_v9_0_ring_emit_patch_cond_exec,
> -       .emit_tmz = gfx_v9_0_ring_emit_tmz,
> +       .emit_frame_cntl = gfx_v9_0_ring_emit_frame_cntl,
>         .emit_wreg = gfx_v9_0_ring_emit_wreg,
>         .emit_reg_wait = gfx_v9_0_ring_emit_reg_wait,
>         .emit_reg_write_reg_wait = gfx_v9_0_ring_emit_reg_write_reg_wait,
> --
> 2.7.4
>
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