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[src/trunk]: src/sys/external/bsd/drm2 drm: Rewrite drm_gem_cma_helper.h from...
details: https://anonhg.NetBSD.org/src/rev/a665501d7d5a
branches: trunk
changeset: 368258:a665501d7d5a
user: riastradh <riastradh%NetBSD.org@localhost>
date: Sat Jul 02 00:26:07 2022 +0000
description:
drm: Rewrite drm_gem_cma_helper.h from scratch.
The header file was originally part of drm with no licence text,
which I took to mean BSD-licensed like the rest of the Linux drm code
base is by default -- everything in Linux under include/drm and
drivers/gpu/drm not otherwise marked.
In 2017, a tree-wide automated change was applied to Linux which
caused an SPDX GPL header to appear in drm_gem_cma_helper.h. When I
asked the drm developers about this in drm files, they explained that
it was an automated process and many of the SPDX headers were wrong,
so when excluding GPL files in drm updates, I heeded the actual GPL
vs BSD/MIT licence text and revision history rather than the SPDX
headers.
I excluded drm_gem_cma_helper.c because it was clearly originally GPL
as an exception to the default BSD licence under Linux's
drivers/gpu/drm, and Jared reimplemented the API for ues by some
(NetBSD, BSD-licensed) Arm display drivers.
During an update after that, the header file was lost in the merge
shuffle and I copied it back in without noticing the SPDX header
file. In retrospect, I see now that it's not clear what the intent
was: the .c file was obviously GPL, and maybe the .h file was
supposed to be too but it wasn't carved out as an exception among the
drm code.
To keep our story simpler, I just drafted a new .h file that provides
a compatible subset of the interface we use, derived from the .c file
Jared wrote, written according to several deterministic rules based
on KNF that yield a non-creative specification of the compatible
interface:
1. $NetBSD$ RCS id
2. standard TNF copyright statement
3. header guard derived from #include file name
4. minimal #includes, grouped and sorted according to KNF
5. forward declaration of structs, sorted lexicographically
6. definitions of structs, members sorted lexicographically by name
7. downcasting macros, written in KNF and sorted lexicographically
8. minimal extern variable declarations, sorted lexicographically
9. minimal, function prototypes, written in KNF and sorted
lexicographically
`Minimal' means added one by one, according to the errors issued by
the compiler (and in the case of #includes, according to the correct
header file for the missing types or function prototypes being used),
until the compiler is formally satisfied.
Any changes to this will, unless otherwise marked, be covered by the
standard TNF licence now on the file.
diffstat:
sys/external/bsd/drm2/drm/drm_gem_cma_helper.c | 11 +-
sys/external/bsd/drm2/include/drm/drm_gem_cma_helper.h | 202 +++++-----------
2 files changed, 67 insertions(+), 146 deletions(-)
diffs (253 lines):
diff -r 082e65bac44c -r a665501d7d5a sys/external/bsd/drm2/drm/drm_gem_cma_helper.c
--- a/sys/external/bsd/drm2/drm/drm_gem_cma_helper.c Fri Jul 01 22:30:51 2022 +0000
+++ b/sys/external/bsd/drm2/drm/drm_gem_cma_helper.c Sat Jul 02 00:26:07 2022 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: drm_gem_cma_helper.c,v 1.13 2021/12/19 09:52:00 riastradh Exp $ */
+/* $NetBSD: drm_gem_cma_helper.c,v 1.14 2022/07/02 00:26:07 riastradh Exp $ */
/*-
* Copyright (c) 2015-2017 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,16 +27,17 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: drm_gem_cma_helper.c,v 1.13 2021/12/19 09:52:00 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: drm_gem_cma_helper.c,v 1.14 2022/07/02 00:26:07 riastradh Exp $");
#include <linux/err.h>
+#include <drm/bus_dma_hacks.h>
#include <drm/drm_drv.h>
-#include <drm/drm_print.h>
#include <drm/drm_gem_cma_helper.h>
-#include <drm/bus_dma_hacks.h>
+#include <drm/drm_prime.h>
+#include <drm/drm_print.h>
-#include <uvm/uvm.h>
+#include <uvm/uvm_extern.h>
static struct drm_gem_cma_object *
drm_gem_cma_create_internal(struct drm_device *ddev, size_t size,
diff -r 082e65bac44c -r a665501d7d5a sys/external/bsd/drm2/include/drm/drm_gem_cma_helper.h
--- a/sys/external/bsd/drm2/include/drm/drm_gem_cma_helper.h Fri Jul 01 22:30:51 2022 +0000
+++ b/sys/external/bsd/drm2/include/drm/drm_gem_cma_helper.h Sat Jul 02 00:26:07 2022 +0000
@@ -1,157 +1,77 @@
-/* $NetBSD: drm_gem_cma_helper.h,v 1.2 2021/12/19 10:29:16 riastradh Exp $ */
+/* $NetBSD: drm_gem_cma_helper.h,v 1.3 2022/07/02 00:26:07 riastradh Exp $ */
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __DRM_GEM_CMA_HELPER_H__
-#define __DRM_GEM_CMA_HELPER_H__
+/*-
+ * Copyright (c) 2022 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
-#include <drm/drm_file.h>
-#include <drm/drm_ioctl.h>
-#include <drm/drm_gem.h>
+#ifndef _DRM_DRM_GEM_CMA_HELPER_H_
+#define _DRM_DRM_GEM_CMA_HELPER_H_
+#include <sys/types.h>
+
+#include <sys/bus.h>
#include <sys/vmem.h>
-struct drm_mode_create_dumb;
+#include <uvm/uvm_pager.h>
+
+#include <drm/drm_gem.h>
-/**
- * struct drm_gem_cma_object - GEM object backed by CMA memory allocations
- * @base: base GEM object
- * @paddr: physical address of the backing memory
- * @sgt: scatter/gather table for imported PRIME buffers. The table can have
- * more than one entry but they are guaranteed to have contiguous
- * DMA addresses.
- * @vaddr: kernel virtual address of the backing memory
- */
+struct dma_buf_attachment
+struct drm_device;
+struct drm_file;
+struct drm_gem_cma_object;
+struct drm_gem_object;
+struct drm_mode_create_dumb;
+struct sg_table;
+struct vmem;
+
struct drm_gem_cma_object {
struct drm_gem_object base;
-#ifdef __NetBSD__
- bus_dma_tag_t dmat;
+ bus_dmamap_t dmamap;
bus_dma_segment_t dmasegs[1];
bus_size_t dmasize;
- bus_dmamap_t dmamap;
- vmem_t *vmem_pool;
+ bus_dma_tag_t dmat;
+ struct sg_table *sgt;
+ void *vaddr;
vmem_addr_t vmem_addr;
-#else
- dma_addr_t paddr;
-#endif
- struct sg_table *sgt;
-
- /* For objects with DMA memory allocated by GEM CMA */
- void *vaddr;
+ struct vmem *vmem_pool;
};
-#define to_drm_gem_cma_obj(gem_obj) \
- container_of(gem_obj, struct drm_gem_cma_object, base)
-
-#ifndef CONFIG_MMU
-#define DRM_GEM_CMA_UNMAPPED_AREA_FOPS \
- .get_unmapped_area = drm_gem_cma_get_unmapped_area,
-#else
-#define DRM_GEM_CMA_UNMAPPED_AREA_FOPS
-#endif
+#define to_drm_gem_cma_obj(GEM_OBJ) \
+ container_of((GEM_OBJ), struct drm_gem_cma_object, base)
-/**
- * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers
- * @name: name for the generated structure
- *
- * This macro autogenerates a suitable &struct file_operations for CMA based
- * drivers, which can be assigned to &drm_driver.fops. Note that this structure
- * cannot be shared between drivers, because it contains a reference to the
- * current module using THIS_MODULE.
- *
- * Note that the declaration is already marked as static - if you need a
- * non-static version of this you're probably doing it wrong and will break the
- * THIS_MODULE reference by accident.
- */
-#define DEFINE_DRM_GEM_CMA_FOPS(name) \
- static const struct file_operations name = {\
- .owner = THIS_MODULE,\
- .open = drm_open,\
- .release = drm_release,\
- .unlocked_ioctl = drm_ioctl,\
- .compat_ioctl = drm_compat_ioctl,\
- .poll = drm_poll,\
- .read = drm_read,\
- .llseek = noop_llseek,\
- .mmap = drm_gem_cma_mmap,\
- DRM_GEM_CMA_UNMAPPED_AREA_FOPS \
- }
-
-/* free GEM object */
-void drm_gem_cma_free_object(struct drm_gem_object *gem_obj);
-
-/* create memory region for DRM framebuffer */
-int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
- struct drm_device *drm,
- struct drm_mode_create_dumb *args);
-
-/* create memory region for DRM framebuffer */
-int drm_gem_cma_dumb_create(struct drm_file *file_priv,
- struct drm_device *drm,
- struct drm_mode_create_dumb *args);
-
-/* set vm_flags and we can change the VM attribute to other one at here */
-#ifndef __NetBSD__
-int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
-#endif
+extern const struct uvm_pagerops drm_gem_cma_uvm_ops;
-/* allocate physical memory */
-struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
- size_t size);
-
-#ifdef __NetBSD__
-extern const struct uvm_pagerops drm_gem_cma_uvm_ops;
-#else
-extern const struct vm_operations_struct drm_gem_cma_vm_ops;
-#endif
-
-#ifndef CONFIG_MMU
-unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
- unsigned long addr,
- unsigned long len,
- unsigned long pgoff,
- unsigned long flags);
-#endif
-
-void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent,
- const struct drm_gem_object *obj);
+struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *, size_t);
+int drm_gem_cma_dumb_create(struct drm_file *, struct drm_device *,
+ struct drm_mode_create_dumb *);
+void drm_gem_cma_free_object(struct drm_gem_object *);
+struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *);
+struct drm_gem_object *drm_gem_cma_prime_import_sg_table(struct drm_device *,
+ struct dma_buf_attachment *, struct sg_table *);
+void *drm_gem_cma_prime_vmap(struct drm_gem_object *);
+void drm_gem_cma_prime_vunmap(struct drm_gem_object *, void *);
-struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
-struct drm_gem_object *
-drm_gem_cma_prime_import_sg_table(struct drm_device *dev,
- struct dma_buf_attachment *attach,
- struct sg_table *sgt);
-#ifdef __NetBSD__
-int drm_gem_cma_prime_mmap(struct drm_gem_object *, off_t *, size_t, int,
- int *, int *, struct uvm_object **, int *);
-#else
-int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
- struct vm_area_struct *vma);
-#endif
-void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
-void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
-
-struct drm_gem_object *
-drm_cma_gem_create_object_default_funcs(struct drm_device *dev, size_t size);
-
-/**
- * DRM_GEM_CMA_VMAP_DRIVER_OPS - CMA GEM driver operations ensuring a virtual
- * address on the buffer
- *
- * This macro provides a shortcut for setting the default GEM operations in the
- * &drm_driver structure for drivers that need the virtual address also on
- * imported buffers.
- */
-#define DRM_GEM_CMA_VMAP_DRIVER_OPS \
- .gem_create_object = drm_cma_gem_create_object_default_funcs, \
- .dumb_create = drm_gem_cma_dumb_create, \
- .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \
- .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \
- .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap, \
- .gem_prime_mmap = drm_gem_prime_mmap
-
-struct drm_gem_object *
-drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *drm,
- struct dma_buf_attachment *attach,
- struct sg_table *sgt);
-
-#endif /* __DRM_GEM_CMA_HELPER_H__ */
+#endif /* _DRM_DRM_GEM_CMA_HELPER_H_ */
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