target/linux/bcm27xx/patches-5.4/950-0315-drm-v3d-clean-caches-at-the-end-of-render-jobs-on-re.patch

   1 From 141da39c2ce8dbf77773c54182244c14d96b301d Mon Sep 17 00:00:00 2001
   2 From: Iago Toral Quiroga <itoral@igalia.com>
   3 Date: Tue, 3 Sep 2019 08:45:24 +0200
   4 Subject: [PATCH] drm/v3d: clean caches at the end of render jobs on
   5  request from user space
   6
   7 Extends the user space ioctl for CL submissions so it can include a request
   8 to flush the cache once the CL execution has completed. Fixes memory
   9 write violation messages reported by the kernel in workloads involving
  10 shader memory writes (SSBOs, shader images, scratch, etc) which sometimes
  11 also lead to GPU resets during Piglit and CTS workloads.
  12
  13 v2: if v3d_job_init() fails we need to kfree() the job instead of
  14     v3d_job_put() it (Eric Anholt).
  15
  16 v3 (Eric Anholt):
  17   - Drop _FLAG suffix from the new flag name.
  18   - Add a new param so userspace can tell whether cache flushing is
  19     implemented in the kernel.
  20
  21 Signed-off-by: Iago Toral Quiroga <itoral@igalia.com>
  22 ---
  23  drivers/gpu/drm/v3d/v3d_drv.c |  3 +++
  24  drivers/gpu/drm/v3d/v3d_gem.c | 48 ++++++++++++++++++++++++++++++-----
  25  include/uapi/drm/v3d_drm.h    |  6 +++--
  26  3 files changed, 49 insertions(+), 8 deletions(-)
  27
  28 --- a/drivers/gpu/drm/v3d/v3d_drv.c
  29 +++ b/drivers/gpu/drm/v3d/v3d_drv.c
  30 @@ -120,6 +120,9 @@ static int v3d_get_param_ioctl(struct dr
  31         case DRM_V3D_PARAM_SUPPORTS_CSD:
  32                 args->value = v3d_has_csd(v3d);
  33                 return 0;
  34 +       case DRM_V3D_PARAM_SUPPORTS_CACHE_FLUSH:
  35 +               args->value = 1;
  36 +               return 0;
  37         default:
  38                 DRM_DEBUG("Unknown parameter %d\n", args->param);
  39                 return -EINVAL;
  40 --- a/drivers/gpu/drm/v3d/v3d_gem.c
  41 +++ b/drivers/gpu/drm/v3d/v3d_gem.c
  42 @@ -565,13 +565,16 @@ v3d_submit_cl_ioctl(struct drm_device *d
  43         struct drm_v3d_submit_cl *args = data;
  44         struct v3d_bin_job *bin = NULL;
  45         struct v3d_render_job *render;
  46 +       struct v3d_job *clean_job = NULL;
  47 +       struct v3d_job *last_job;
  48         struct ww_acquire_ctx acquire_ctx;
  49         int ret = 0;
  50
  51         trace_v3d_submit_cl_ioctl(&v3d->drm, args->rcl_start, args->rcl_end);
  52
  53 -       if (args->pad != 0) {
  54 -               DRM_INFO("pad must be zero: %d\n", args->pad);
  55 +       if (args->flags != 0 &&
  56 +           args->flags != DRM_V3D_SUBMIT_CL_FLUSH_CACHE) {
  57 +               DRM_INFO("invalid flags: %d\n", args->flags);
  58                 return -EINVAL;
  59         }
  60
  61 @@ -613,12 +616,31 @@ v3d_submit_cl_ioctl(struct drm_device *d
  62                 bin->render = render;
  63         }
  64
  65 -       ret = v3d_lookup_bos(dev, file_priv, &render->base,
  66 +       if (args->flags & DRM_V3D_SUBMIT_CL_FLUSH_CACHE) {
  67 +               clean_job = kcalloc(1, sizeof(*clean_job), GFP_KERNEL);
  68 +               if (!clean_job) {
  69 +                       ret = -ENOMEM;
  70 +                       goto fail;
  71 +               }
  72 +
  73 +               ret = v3d_job_init(v3d, file_priv, clean_job, v3d_job_free, 0);
  74 +               if (ret) {
  75 +                       kfree(clean_job);
  76 +                       clean_job = NULL;
  77 +                       goto fail;
  78 +               }
  79 +
  80 +               last_job = clean_job;
  81 +       } else {
  82 +               last_job = &render->base;
  83 +       }
  84 +
  85 +       ret = v3d_lookup_bos(dev, file_priv, last_job,
  86                              args->bo_handles, args->bo_handle_count);
  87         if (ret)
  88                 goto fail;
  89
  90 -       ret = v3d_lock_bo_reservations(&render->base, &acquire_ctx);
  91 +       ret = v3d_lock_bo_reservations(last_job, &acquire_ctx);
  92         if (ret)
  93                 goto fail;
  94
  95 @@ -637,17 +659,29 @@ v3d_submit_cl_ioctl(struct drm_device *d
  96         ret = v3d_push_job(v3d_priv, &render->base, V3D_RENDER);
  97         if (ret)
  98                 goto fail_unreserve;
  99 +
 100 +       if (clean_job) {
 101 +               ret = drm_gem_fence_array_add(&clean_job->deps,
 102 +                                             dma_fence_get(render->base.done_fence));
 103 +               if (ret)
 104 +                       goto fail_unreserve;
 105 +               ret = v3d_push_job(v3d_priv, clean_job, V3D_CACHE_CLEAN);
 106 +               if (ret)
 107 +                       goto fail_unreserve;
 108 +       }
 109         mutex_unlock(&v3d->sched_lock);
 110
 111         v3d_attach_fences_and_unlock_reservation(file_priv,
 112 -                                                &render->base,
 113 +                                                last_job,
 114                                                  &acquire_ctx,
 115                                                  args->out_sync,
 116 -                                                render->base.done_fence);
 117 +                                                last_job->done_fence);
 118
 119         if (bin)
 120                 v3d_job_put(&bin->base);
 121         v3d_job_put(&render->base);
 122 +       if (clean_job)
 123 +               v3d_job_put(clean_job);
 124
 125         return 0;
 126
 127 @@ -659,6 +693,8 @@ fail:
 128         if (bin)
 129                 v3d_job_put(&bin->base);
 130         v3d_job_put(&render->base);
 131 +       if (clean_job)
 132 +               v3d_job_put(clean_job);
 133
 134         return ret;
 135  }
 136 --- a/include/uapi/drm/v3d_drm.h
 137 +++ b/include/uapi/drm/v3d_drm.h
 138 @@ -48,6 +48,8 @@ extern "C" {
 139  #define DRM_IOCTL_V3D_SUBMIT_TFU          DRM_IOW(DRM_COMMAND_BASE + DRM_V3D_SUBMIT_TFU, struct drm_v3d_submit_tfu)
 140  #define DRM_IOCTL_V3D_SUBMIT_CSD          DRM_IOW(DRM_COMMAND_BASE + DRM_V3D_SUBMIT_CSD, struct drm_v3d_submit_csd)
 141
 142 +#define DRM_V3D_SUBMIT_CL_FLUSH_CACHE             0x01
 143 +
 144  /**
 145   * struct drm_v3d_submit_cl - ioctl argument for submitting commands to the 3D
 146   * engine.
 147 @@ -124,8 +126,7 @@ struct drm_v3d_submit_cl {
 148         /* Number of BO handles passed in (size is that times 4). */
 149         __u32 bo_handle_count;
 150
 151 -       /* Pad, must be zero-filled. */
 152 -       __u32 pad;
 153 +       __u32 flags;
 154  };
 155
 156  /**
 157 @@ -193,6 +194,7 @@ enum drm_v3d_param {
 158         DRM_V3D_PARAM_V3D_CORE0_IDENT2,
 159         DRM_V3D_PARAM_SUPPORTS_TFU,
 160         DRM_V3D_PARAM_SUPPORTS_CSD,
 161 +       DRM_V3D_PARAM_SUPPORTS_CACHE_FLUSH,
 162  };
 163
 164  struct drm_v3d_get_param {