drm/amdgpu/gfx_v9_4_3: Apply Isolation Enforcement to GFX & Compute rings

This commit applies isolation enforcement to the GFX and Compute rings
in the gfx_v9_4_3 module.

The commit sets `amdgpu_gfx_enforce_isolation_ring_begin_use` and
`amdgpu_gfx_enforce_isolation_ring_end_use` as the functions to be
called when a ring begins and ends its use, respectively.

`amdgpu_gfx_enforce_isolation_ring_begin_use` is called when a ring
begins its use. This function cancels any scheduled
`enforce_isolation_work` and, if necessary, signals the Kernel Fusion
Driver (KFD) to stop the runqueue.

`amdgpu_gfx_enforce_isolation_ring_end_use` is called when a ring ends
its use. This function schedules `enforce_isolation_work` to be run
after a delay.

These functions are part of the Enforce Isolation Handler, which
enforces shader isolation on AMD GPUs to prevent data leakage between
different processes.

The commit also includes a check for the type of the ring. If the type
of the ring is `AMDGPU_RING_TYPE_COMPUTE`, the `xcp_id` of the
`enforce_isolation` structure in the `gfx` structure of the
`amdgpu_device` is set to the `xcp_id` of the ring. This ensures that
the correct `xcp_id` is used when enforcing isolation on compute rings.
The `xcp_id` is an identifier for an XCP partition, and different rings
can be associated with different XCP partitions.

Cc: Christian König <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
Signed-off-by: Srinivasan Shanmugam <[e-mail]>

drivers/gpu/drm/amd/amdgpu/aqua_vanjaram.c

···
 	uint32_t inst_mask;
 
 	ring->xcp_id = AMDGPU_XCP_NO_PARTITION;
+	if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE)
+		adev->gfx.enforce_isolation[0].xcp_id = ring->xcp_id;
 	if (adev->xcp_mgr->mode == AMDGPU_XCP_MODE_NONE)
 		return;
 
···
 	for (xcp_id = 0; xcp_id < adev->xcp_mgr->num_xcps; xcp_id++) {
 		if (adev->xcp_mgr->xcp[xcp_id].ip[ip_blk].inst_mask & inst_mask) {
 			ring->xcp_id = xcp_id;
+			if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE)
+				adev->gfx.enforce_isolation[xcp_id].xcp_id = xcp_id;
 			break;
 		}
 	}

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

···
 	.emit_wave_limit = gfx_v9_4_3_emit_wave_limit,
 	.reset = gfx_v9_4_3_reset_kcq,
 	.emit_cleaner_shader = gfx_v9_4_3_ring_emit_cleaner_shader,
+	.begin_use = amdgpu_gfx_enforce_isolation_ring_begin_use,
+	.end_use = amdgpu_gfx_enforce_isolation_ring_end_use,
 };
 
 static const struct amdgpu_ring_funcs gfx_v9_4_3_ring_funcs_kiq = {