[src/trunk]: src/sys/external/bsd/drm2/dist/drm/i915/gem i915: Draft i915_gem...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/bfdcc41f836f
branches:  trunk
changeset: 1028763:bfdcc41f836f
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 11:58:16 2021 +0000

description:
i915: Draft i915_gem_mmap_object.

diffstat:

 sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c |  48 +++++++++++++++-
 1 files changed, 44 insertions(+), 4 deletions(-)

diffs (75 lines):

diff -r 12899a4e3a16 -r bfdcc41f836f sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c
--- a/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c   Sun Dec 19 11:58:09 2021 +0000
+++ b/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c   Sun Dec 19 11:58:16 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: i915_gem_mman.c,v 1.9 2021/12/19 11:57:42 riastradh Exp $      */
+/*     $NetBSD: i915_gem_mman.c,v 1.10 2021/12/19 11:58:16 riastradh Exp $     */
 
 /*
  * SPDX-License-Identifier: MIT
@@ -7,13 +7,15 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: i915_gem_mman.c,v 1.9 2021/12/19 11:57:42 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: i915_gem_mman.c,v 1.10 2021/12/19 11:58:16 riastradh Exp $");
 
 #include <linux/anon_inodes.h>
 #include <linux/mman.h>
 #include <linux/pfn_t.h>
 #include <linux/sizes.h>
 
+#include "drm/drm_gem.h"
+
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_requests.h"
 
@@ -1023,8 +1025,46 @@
 i915_gem_mmap_object(struct drm_device *dev, off_t byte_offset, size_t nbytes,
     int prot, struct uvm_object **uobjp, voff_t *uoffsetp, struct file *fp)
 {
-       __USE(i915_gem_fault);
-       panic("NYI");
+       const unsigned long startpage = byte_offset >> PAGE_SHIFT;
+       const unsigned long npages = nbytes >> PAGE_SHIFT;
+       struct drm_file *file = fp->f_data;
+       struct drm_vma_offset_node *node;
+       struct drm_i915_gem_object *obj = NULL;
+       struct i915_mmap_offset *mmo = NULL;
+
+       if (drm_dev_is_unplugged(dev))
+               return -ENODEV;
+
+       rcu_read_lock();
+       drm_vma_offset_lock_lookup(dev->vma_offset_manager);
+       node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
+           startpage, npages);
+       if (node && drm_vma_node_is_allowed(node, file)) {
+               /*
+                * Skip 0-refcnted objects as it is in the process of being
+                * destroyed and will be invalid when the vma manager lock
+                * is released.
+                */
+               mmo = container_of(node, struct i915_mmap_offset, vma_node);
+               obj = i915_gem_object_get_rcu(mmo->obj);
+       }
+       drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
+       rcu_read_unlock();
+       if (!obj)
+               return node ? -EACCES : -EINVAL;
+
+       if (i915_gem_object_is_readonly(obj)) {
+               if (prot & VM_PROT_WRITE) {
+                       i915_gem_object_put(obj);
+                       return -EINVAL;
+               }
+       }
+
+       /* Success!  */
+       drm_gem_object_get(&obj->base);
+       *uobjp = &obj->base.gemo_uvmobj;
+       *uoffsetp = 0;
+       return 0;
 }
 
 #else