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drm/v3d: Add support for compute shader dispatch.

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The compute shader dispatch interface is pretty simple -- just pass in
the regs that userspace has passed us, with no CLs to run.  However,
with no CL to run it means that we need to do manual cache flushing of
the L2 after the HW execution completes (for SSBO, atomic, and
image_load_store writes that are the output of compute shaders).

This doesn't yet expose the L2 cache's ability to have a region of the
address space not write back to memory (which could be used for
shared_var storage).

So far, the Mesa side has been tested on V3D v4.2 simpenrose (passing
the ES31 tests), and on the kernel side on 7278 (failing atomic
compswap tests in a way that doesn't reproduce on simpenrose).

v2: Fix excessive allocation for the clean_job (reported by Dan
    Carpenter).  Keep refs on jobs until clean_job is finished, to
    avoid spurious MMU errors if the output BOs are freed by userspace
    before L2 cleaning is finished.

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190416225856.20264-4-eric@anholt.net
Acked-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Eric Anholt
2019-04-16 15:58:54 -07:00
parent a783a09ee7
commit d223f98f02
10 changed files with 531 additions and 19 deletions
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10
drivers/gpu/drm/v3d/v3d_drv.c
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@@ -7,9 +7,9 @@
* This driver supports the Broadcom V3D 3.3 and 4.1 OpenGL ES GPUs.
* For V3D 2.x support, see the VC4 driver.
*
* Currently only single-core rendering using the binner and renderer,
* along with TFU (texture formatting unit) rendering is supported.
* V3D 4.x's CSD (compute shader dispatch) is not yet supported.
* The V3D GPU includes a tiled render (composed of a bin and render
* pipelines), the TFU (texture formatting unit), and the CSD (compute
* shader dispatch).
*/
#include <linux/clk.h>
@@ -120,6 +120,9 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
case DRM_V3D_PARAM_SUPPORTS_TFU:
args->value = 1;
return 0;
case DRM_V3D_PARAM_SUPPORTS_CSD:
args->value = v3d_has_csd(v3d);
return 0;
default:
DRM_DEBUG("Unknown parameter %d\n", args->param);
return -EINVAL;
@@ -179,6 +182,7 @@ static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(V3D_SUBMIT_TFU, v3d_submit_tfu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CSD, v3d_submit_csd_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
};
static struct drm_driver v3d_drm_driver = {