drm/etnaviv: copy pmrs from userspace

Changes from v1 -> v2:
- renamed submit_perfmon_request() to submit_perfmon_validate()
- extended flags validation
- added comment about offset 0
- moved assigment of cmdbuf->nr_pmrs below the copy_from_user of the pmrs.

Changes from v2 -> v3:
- fixed flags validation

Changes v4 -> v5
- pass cmdbuf->exec_state to etnaviv_pm_req_validate(..)

Signed-off-by: Christian Gmeiner <[e-mail]>
Signed-off-by: Lucas Stach <[e-mail]>

drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c

···
 #include "etnaviv_drv.h"
 #include "etnaviv_gpu.h"
 #include "etnaviv_gem.h"
+#include "etnaviv_perfmon.h"
 
 /*
  * Cmdstream submission:
···
 	return 0;
 }
 
+static int submit_perfmon_validate(struct etnaviv_gem_submit *submit,
+		struct etnaviv_cmdbuf *cmdbuf,
+		const struct drm_etnaviv_gem_submit_pmr *pmrs,
+		u32 nr_pms)
+{
+	u32 i;
+
+	for (i = 0; i < nr_pms; i++) {
+		const struct drm_etnaviv_gem_submit_pmr *r = pmrs + i;
+		struct etnaviv_gem_submit_bo *bo;
+		int ret;
+
+		ret = submit_bo(submit, r->read_idx, &bo);
+		if (ret)
+			return ret;
+
+		/* at offset 0 a sequence number gets stored used for userspace sync */
+		if (r->read_offset == 0) {
+			DRM_ERROR("perfmon request: offset is 0");
+			return -EINVAL;
+		}
+
+		if (r->read_offset >= bo->obj->base.size - sizeof(u32)) {
+			DRM_ERROR("perfmon request: offset %u outside object", i);
+			return -EINVAL;
+		}
+
+		if (r->flags & ~(ETNA_PM_PROCESS_PRE | ETNA_PM_PROCESS_POST)) {
+			DRM_ERROR("perfmon request: flags are not valid");
+			return -EINVAL;
+		}
+
+		if (etnaviv_pm_req_validate(r, cmdbuf->exec_state)) {
+			DRM_ERROR("perfmon request: domain or signal not valid");
+			return -EINVAL;
+		}
+
+		cmdbuf->pmrs[i].flags = r->flags;
+		cmdbuf->pmrs[i].domain = r->domain;
+		cmdbuf->pmrs[i].signal = r->signal;
+		cmdbuf->pmrs[i].sequence = r->sequence;
+		cmdbuf->pmrs[i].offset = r->read_offset;
+		cmdbuf->pmrs[i].bo_vma = etnaviv_gem_vmap(&bo->obj->base);
+	}
+
+	return 0;
+}
+
 static void submit_cleanup(struct etnaviv_gem_submit *submit)
 {
 	unsigned i;
···
 	struct etnaviv_drm_private *priv = dev->dev_private;
 	struct drm_etnaviv_gem_submit *args = data;
 	struct drm_etnaviv_gem_submit_reloc *relocs;
+	struct drm_etnaviv_gem_submit_pmr *pmrs;
 	struct drm_etnaviv_gem_submit_bo *bos;
 	struct etnaviv_gem_submit *submit;
 	struct etnaviv_cmdbuf *cmdbuf;
···
 	 */
 	bos = kvmalloc_array(args->nr_bos, sizeof(*bos), GFP_KERNEL);
 	relocs = kvmalloc_array(args->nr_relocs, sizeof(*relocs), GFP_KERNEL);
+	pmrs = kvmalloc_array(args->nr_pmrs, sizeof(*pmrs), GFP_KERNEL);
 	stream = kvmalloc_array(1, args->stream_size, GFP_KERNEL);
 	cmdbuf = etnaviv_cmdbuf_new(gpu->cmdbuf_suballoc,
 				    ALIGN(args->stream_size, 8) + 8,
-				    args->nr_bos, 0);
-	if (!bos || !relocs || !stream || !cmdbuf) {
+				    args->nr_bos, args->nr_pmrs);
+	if (!bos || !relocs || !pmrs || !stream || !cmdbuf) {
 		ret = -ENOMEM;
 		goto err_submit_cmds;
 	}
···
 		ret = -EFAULT;
 		goto err_submit_cmds;
 	}
+
+	ret = copy_from_user(pmrs, u64_to_user_ptr(args->pmrs),
+			     args->nr_pmrs * sizeof(*pmrs));
+	if (ret) {
+		ret = -EFAULT;
+		goto err_submit_cmds;
+	}
+	cmdbuf->nr_pmrs = args->nr_pmrs;
 
 	ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 			     args->stream_size);
···
 	if (ret)
 		goto out;
 
+	ret = submit_perfmon_validate(submit, cmdbuf, pmrs, args->nr_pmrs);
+	if (ret)
+		goto out;
+
 	memcpy(cmdbuf->vaddr, stream, args->stream_size);
 	cmdbuf->user_size = ALIGN(args->stream_size, 8);
 
···
 		kvfree(bos);
 	if (relocs)
 		kvfree(relocs);
+	if (pmrs)
+		kvfree(pmrs);
 
 	return ret;
 }