[PATCH] drm/amdgpu: fix the gfx hang while use per-ib secure flag
Luben Tuikov
luben.tuikov at amd.com
Tue Feb 25 23:40:07 UTC 2020
On 2020-02-25 8:57 a.m., Huang Rui 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 at amd.com>
> Signed-off-by: Huang Rui <ray.huang at amd.com>
> ---
> 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;
Don't initialize them far away from where they're being
used. That's a very bad habit.
This function is pretty long.
Initialize "secure" next to where it is being used--right
above the for-loop so that it is clear how it's used.
>
> 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;
Set "secure" here, close to where it is used.
This makes the code modular, so that it is easy
to see what is happening _locally_. Another
advantage is that should ever this code be pulled
out into its own function, we don't have to chase
variables around.
> 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);
> + }
So the above is executed only once. At the very first
iteration, since "secure" is set to -1. You can pull
that out of the loop and have a more straightforward
body of the loop.
Regards,
Luben
> + } 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,
>
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