Module Name: src
Committed By: riastradh
Date: Sun Dec 19 11:58:17 UTC 2021
Modified Files:
src/sys/external/bsd/drm2/dist/drm/i915/gem: i915_gem_mman.c
Log Message:
i915: Draft i915_gem_mmap_object.
To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 \
src/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c
diff -u src/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c:1.9 src/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c:1.10
--- src/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c:1.9 Sun Dec 19 11:57:42 2021
+++ src/sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c Sun Dec 19 11:58:16 2021
@@ -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 @@ int
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
