[PATCH 01/20] drm/radeon: move drm_buffer to drm/radeon/
David Herrmann
dh.herrmann at gmail.com
Fri Aug 29 03:12:27 PDT 2014
Radeon UMS is the last user of drm_buffer. Move it out of sight so radeon
can drop it together with UMS.
Signed-off-by: David Herrmann <dh.herrmann at gmail.com>
---
drivers/gpu/drm/Makefile | 2 +-
drivers/gpu/drm/drm_buffer.c | 181 ----------------------------------
drivers/gpu/drm/radeon/Makefile | 2 +-
drivers/gpu/drm/radeon/drm_buffer.c | 177 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/radeon/drm_buffer.h | 148 +++++++++++++++++++++++++++
drivers/gpu/drm/radeon/r300_cmdbuf.c | 2 +-
drivers/gpu/drm/radeon/radeon_state.c | 2 +-
include/drm/drm_buffer.h | 148 ---------------------------
8 files changed, 329 insertions(+), 333 deletions(-)
delete mode 100644 drivers/gpu/drm/drm_buffer.c
create mode 100644 drivers/gpu/drm/radeon/drm_buffer.c
create mode 100644 drivers/gpu/drm/radeon/drm_buffer.h
delete mode 100644 include/drm/drm_buffer.h
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 4a55d59..9b7cb3f 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -4,7 +4,7 @@
ccflags-y := -Iinclude/drm
-drm-y := drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
+drm-y := drm_auth.o drm_bufs.o drm_cache.o \
drm_context.o drm_dma.o \
drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \
drm_lock.o drm_memory.o drm_drv.o drm_vm.o \
diff --git a/drivers/gpu/drm/drm_buffer.c b/drivers/gpu/drm/drm_buffer.c
deleted file mode 100644
index 86a4a4a..0000000
--- a/drivers/gpu/drm/drm_buffer.c
+++ /dev/null
@@ -1,181 +0,0 @@
-/**************************************************************************
- *
- * Copyright 2010 Pauli Nieminen.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- *
- **************************************************************************/
-/*
- * Multipart buffer for coping data which is larger than the page size.
- *
- * Authors:
- * Pauli Nieminen <suokkos-at-gmail-dot-com>
- */
-
-#include <linux/export.h>
-#include <drm/drm_buffer.h>
-
-/**
- * Allocate the drm buffer object.
- *
- * buf: Pointer to a pointer where the object is stored.
- * size: The number of bytes to allocate.
- */
-int drm_buffer_alloc(struct drm_buffer **buf, int size)
-{
- int nr_pages = size / PAGE_SIZE + 1;
- int idx;
-
- /* Allocating pointer table to end of structure makes drm_buffer
- * variable sized */
- *buf = kzalloc(sizeof(struct drm_buffer) + nr_pages*sizeof(char *),
- GFP_KERNEL);
-
- if (*buf == NULL) {
- DRM_ERROR("Failed to allocate drm buffer object to hold"
- " %d bytes in %d pages.\n",
- size, nr_pages);
- return -ENOMEM;
- }
-
- (*buf)->size = size;
-
- for (idx = 0; idx < nr_pages; ++idx) {
-
- (*buf)->data[idx] =
- kmalloc(min(PAGE_SIZE, size - idx * PAGE_SIZE),
- GFP_KERNEL);
-
-
- if ((*buf)->data[idx] == NULL) {
- DRM_ERROR("Failed to allocate %dth page for drm"
- " buffer with %d bytes and %d pages.\n",
- idx + 1, size, nr_pages);
- goto error_out;
- }
-
- }
-
- return 0;
-
-error_out:
-
- for (; idx >= 0; --idx)
- kfree((*buf)->data[idx]);
-
- kfree(*buf);
- return -ENOMEM;
-}
-EXPORT_SYMBOL(drm_buffer_alloc);
-
-/**
- * Copy the user data to the begin of the buffer and reset the processing
- * iterator.
- *
- * user_data: A pointer the data that is copied to the buffer.
- * size: The Number of bytes to copy.
- */
-int drm_buffer_copy_from_user(struct drm_buffer *buf,
- void __user *user_data, int size)
-{
- int nr_pages = size / PAGE_SIZE + 1;
- int idx;
-
- if (size > buf->size) {
- DRM_ERROR("Requesting to copy %d bytes to a drm buffer with"
- " %d bytes space\n",
- size, buf->size);
- return -EFAULT;
- }
-
- for (idx = 0; idx < nr_pages; ++idx) {
-
- if (copy_from_user(buf->data[idx],
- user_data + idx * PAGE_SIZE,
- min(PAGE_SIZE, size - idx * PAGE_SIZE))) {
- DRM_ERROR("Failed to copy user data (%p) to drm buffer"
- " (%p) %dth page.\n",
- user_data, buf, idx);
- return -EFAULT;
-
- }
- }
- buf->iterator = 0;
- return 0;
-}
-EXPORT_SYMBOL(drm_buffer_copy_from_user);
-
-/**
- * Free the drm buffer object
- */
-void drm_buffer_free(struct drm_buffer *buf)
-{
-
- if (buf != NULL) {
-
- int nr_pages = buf->size / PAGE_SIZE + 1;
- int idx;
- for (idx = 0; idx < nr_pages; ++idx)
- kfree(buf->data[idx]);
-
- kfree(buf);
- }
-}
-EXPORT_SYMBOL(drm_buffer_free);
-
-/**
- * Read an object from buffer that may be split to multiple parts. If object
- * is not split function just returns the pointer to object in buffer. But in
- * case of split object data is copied to given stack object that is suplied
- * by caller.
- *
- * The processing location of the buffer is also advanced to the next byte
- * after the object.
- *
- * objsize: The size of the objet in bytes.
- * stack_obj: A pointer to a memory location where object can be copied.
- */
-void *drm_buffer_read_object(struct drm_buffer *buf,
- int objsize, void *stack_obj)
-{
- int idx = drm_buffer_index(buf);
- int page = drm_buffer_page(buf);
- void *obj = NULL;
-
- if (idx + objsize <= PAGE_SIZE) {
- obj = &buf->data[page][idx];
- } else {
- /* The object is split which forces copy to temporary object.*/
- int beginsz = PAGE_SIZE - idx;
- memcpy(stack_obj, &buf->data[page][idx], beginsz);
-
- memcpy(stack_obj + beginsz, &buf->data[page + 1][0],
- objsize - beginsz);
-
- obj = stack_obj;
- }
-
- drm_buffer_advance(buf, objsize);
- return obj;
-}
-EXPORT_SYMBOL(drm_buffer_read_object);
diff --git a/drivers/gpu/drm/radeon/Makefile b/drivers/gpu/drm/radeon/Makefile
index 357f09a..7d7aed5 100644
--- a/drivers/gpu/drm/radeon/Makefile
+++ b/drivers/gpu/drm/radeon/Makefile
@@ -60,7 +60,7 @@ radeon-y := radeon_drv.o
# add UMS driver
radeon-$(CONFIG_DRM_RADEON_UMS)+= radeon_cp.o radeon_state.o radeon_mem.o \
- radeon_irq.o r300_cmdbuf.o r600_cp.o r600_blit.o
+ radeon_irq.o r300_cmdbuf.o r600_cp.o r600_blit.o drm_buffer.o
# add KMS driver
radeon-y += radeon_device.o radeon_asic.o radeon_kms.o \
diff --git a/drivers/gpu/drm/radeon/drm_buffer.c b/drivers/gpu/drm/radeon/drm_buffer.c
new file mode 100644
index 0000000..f4e0f3a
--- /dev/null
+++ b/drivers/gpu/drm/radeon/drm_buffer.c
@@ -0,0 +1,177 @@
+/**************************************************************************
+ *
+ * Copyright 2010 Pauli Nieminen.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ *
+ **************************************************************************/
+/*
+ * Multipart buffer for coping data which is larger than the page size.
+ *
+ * Authors:
+ * Pauli Nieminen <suokkos-at-gmail-dot-com>
+ */
+
+#include <linux/export.h>
+#include "drm_buffer.h"
+
+/**
+ * Allocate the drm buffer object.
+ *
+ * buf: Pointer to a pointer where the object is stored.
+ * size: The number of bytes to allocate.
+ */
+int drm_buffer_alloc(struct drm_buffer **buf, int size)
+{
+ int nr_pages = size / PAGE_SIZE + 1;
+ int idx;
+
+ /* Allocating pointer table to end of structure makes drm_buffer
+ * variable sized */
+ *buf = kzalloc(sizeof(struct drm_buffer) + nr_pages*sizeof(char *),
+ GFP_KERNEL);
+
+ if (*buf == NULL) {
+ DRM_ERROR("Failed to allocate drm buffer object to hold"
+ " %d bytes in %d pages.\n",
+ size, nr_pages);
+ return -ENOMEM;
+ }
+
+ (*buf)->size = size;
+
+ for (idx = 0; idx < nr_pages; ++idx) {
+
+ (*buf)->data[idx] =
+ kmalloc(min(PAGE_SIZE, size - idx * PAGE_SIZE),
+ GFP_KERNEL);
+
+
+ if ((*buf)->data[idx] == NULL) {
+ DRM_ERROR("Failed to allocate %dth page for drm"
+ " buffer with %d bytes and %d pages.\n",
+ idx + 1, size, nr_pages);
+ goto error_out;
+ }
+
+ }
+
+ return 0;
+
+error_out:
+
+ for (; idx >= 0; --idx)
+ kfree((*buf)->data[idx]);
+
+ kfree(*buf);
+ return -ENOMEM;
+}
+
+/**
+ * Copy the user data to the begin of the buffer and reset the processing
+ * iterator.
+ *
+ * user_data: A pointer the data that is copied to the buffer.
+ * size: The Number of bytes to copy.
+ */
+int drm_buffer_copy_from_user(struct drm_buffer *buf,
+ void __user *user_data, int size)
+{
+ int nr_pages = size / PAGE_SIZE + 1;
+ int idx;
+
+ if (size > buf->size) {
+ DRM_ERROR("Requesting to copy %d bytes to a drm buffer with"
+ " %d bytes space\n",
+ size, buf->size);
+ return -EFAULT;
+ }
+
+ for (idx = 0; idx < nr_pages; ++idx) {
+
+ if (copy_from_user(buf->data[idx],
+ user_data + idx * PAGE_SIZE,
+ min(PAGE_SIZE, size - idx * PAGE_SIZE))) {
+ DRM_ERROR("Failed to copy user data (%p) to drm buffer"
+ " (%p) %dth page.\n",
+ user_data, buf, idx);
+ return -EFAULT;
+
+ }
+ }
+ buf->iterator = 0;
+ return 0;
+}
+
+/**
+ * Free the drm buffer object
+ */
+void drm_buffer_free(struct drm_buffer *buf)
+{
+
+ if (buf != NULL) {
+
+ int nr_pages = buf->size / PAGE_SIZE + 1;
+ int idx;
+ for (idx = 0; idx < nr_pages; ++idx)
+ kfree(buf->data[idx]);
+
+ kfree(buf);
+ }
+}
+
+/**
+ * Read an object from buffer that may be split to multiple parts. If object
+ * is not split function just returns the pointer to object in buffer. But in
+ * case of split object data is copied to given stack object that is suplied
+ * by caller.
+ *
+ * The processing location of the buffer is also advanced to the next byte
+ * after the object.
+ *
+ * objsize: The size of the objet in bytes.
+ * stack_obj: A pointer to a memory location where object can be copied.
+ */
+void *drm_buffer_read_object(struct drm_buffer *buf,
+ int objsize, void *stack_obj)
+{
+ int idx = drm_buffer_index(buf);
+ int page = drm_buffer_page(buf);
+ void *obj = NULL;
+
+ if (idx + objsize <= PAGE_SIZE) {
+ obj = &buf->data[page][idx];
+ } else {
+ /* The object is split which forces copy to temporary object.*/
+ int beginsz = PAGE_SIZE - idx;
+ memcpy(stack_obj, &buf->data[page][idx], beginsz);
+
+ memcpy(stack_obj + beginsz, &buf->data[page + 1][0],
+ objsize - beginsz);
+
+ obj = stack_obj;
+ }
+
+ drm_buffer_advance(buf, objsize);
+ return obj;
+}
diff --git a/drivers/gpu/drm/radeon/drm_buffer.h b/drivers/gpu/drm/radeon/drm_buffer.h
new file mode 100644
index 0000000..c80d3a3
--- /dev/null
+++ b/drivers/gpu/drm/radeon/drm_buffer.h
@@ -0,0 +1,148 @@
+/**************************************************************************
+ *
+ * Copyright 2010 Pauli Nieminen.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ *
+ **************************************************************************/
+/*
+ * Multipart buffer for coping data which is larger than the page size.
+ *
+ * Authors:
+ * Pauli Nieminen <suokkos-at-gmail-dot-com>
+ */
+
+#ifndef _DRM_BUFFER_H_
+#define _DRM_BUFFER_H_
+
+#include <drm/drmP.h>
+
+struct drm_buffer {
+ int iterator;
+ int size;
+ char *data[];
+};
+
+
+/**
+ * Return the index of page that buffer is currently pointing at.
+ */
+static inline int drm_buffer_page(struct drm_buffer *buf)
+{
+ return buf->iterator / PAGE_SIZE;
+}
+/**
+ * Return the index of the current byte in the page
+ */
+static inline int drm_buffer_index(struct drm_buffer *buf)
+{
+ return buf->iterator & (PAGE_SIZE - 1);
+}
+/**
+ * Return number of bytes that is left to process
+ */
+static inline int drm_buffer_unprocessed(struct drm_buffer *buf)
+{
+ return buf->size - buf->iterator;
+}
+
+/**
+ * Advance the buffer iterator number of bytes that is given.
+ */
+static inline void drm_buffer_advance(struct drm_buffer *buf, int bytes)
+{
+ buf->iterator += bytes;
+}
+
+/**
+ * Allocate the drm buffer object.
+ *
+ * buf: A pointer to a pointer where the object is stored.
+ * size: The number of bytes to allocate.
+ */
+extern int drm_buffer_alloc(struct drm_buffer **buf, int size);
+
+/**
+ * Copy the user data to the begin of the buffer and reset the processing
+ * iterator.
+ *
+ * user_data: A pointer the data that is copied to the buffer.
+ * size: The Number of bytes to copy.
+ */
+extern int drm_buffer_copy_from_user(struct drm_buffer *buf,
+ void __user *user_data, int size);
+
+/**
+ * Free the drm buffer object
+ */
+extern void drm_buffer_free(struct drm_buffer *buf);
+
+/**
+ * Read an object from buffer that may be split to multiple parts. If object
+ * is not split function just returns the pointer to object in buffer. But in
+ * case of split object data is copied to given stack object that is suplied
+ * by caller.
+ *
+ * The processing location of the buffer is also advanced to the next byte
+ * after the object.
+ *
+ * objsize: The size of the objet in bytes.
+ * stack_obj: A pointer to a memory location where object can be copied.
+ */
+extern void *drm_buffer_read_object(struct drm_buffer *buf,
+ int objsize, void *stack_obj);
+
+/**
+ * Returns the pointer to the dword which is offset number of elements from the
+ * current processing location.
+ *
+ * Caller must make sure that dword is not split in the buffer. This
+ * requirement is easily met if all the sizes of objects in buffer are
+ * multiples of dword and PAGE_SIZE is multiple dword.
+ *
+ * Call to this function doesn't change the processing location.
+ *
+ * offset: The index of the dword relative to the internat iterator.
+ */
+static inline void *drm_buffer_pointer_to_dword(struct drm_buffer *buffer,
+ int offset)
+{
+ int iter = buffer->iterator + offset * 4;
+ return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)];
+}
+/**
+ * Returns the pointer to the dword which is offset number of elements from
+ * the current processing location.
+ *
+ * Call to this function doesn't change the processing location.
+ *
+ * offset: The index of the byte relative to the internat iterator.
+ */
+static inline void *drm_buffer_pointer_to_byte(struct drm_buffer *buffer,
+ int offset)
+{
+ int iter = buffer->iterator + offset;
+ return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)];
+}
+
+#endif
diff --git a/drivers/gpu/drm/radeon/r300_cmdbuf.c b/drivers/gpu/drm/radeon/r300_cmdbuf.c
index 84b1d53..9418e38 100644
--- a/drivers/gpu/drm/radeon/r300_cmdbuf.c
+++ b/drivers/gpu/drm/radeon/r300_cmdbuf.c
@@ -34,10 +34,10 @@
*/
#include <drm/drmP.h>
-#include <drm/drm_buffer.h>
#include <drm/radeon_drm.h>
#include "radeon_drv.h"
#include "r300_reg.h"
+#include "drm_buffer.h"
#include <asm/unaligned.h>
diff --git a/drivers/gpu/drm/radeon/radeon_state.c b/drivers/gpu/drm/radeon/radeon_state.c
index 23bb64f..535403e 100644
--- a/drivers/gpu/drm/radeon/radeon_state.c
+++ b/drivers/gpu/drm/radeon/radeon_state.c
@@ -30,9 +30,9 @@
*/
#include <drm/drmP.h>
-#include <drm/drm_buffer.h>
#include <drm/radeon_drm.h>
#include "radeon_drv.h"
+#include "drm_buffer.h"
/* ================================================================
* Helper functions for client state checking and fixup
diff --git a/include/drm/drm_buffer.h b/include/drm/drm_buffer.h
deleted file mode 100644
index c80d3a3..0000000
--- a/include/drm/drm_buffer.h
+++ /dev/null
@@ -1,148 +0,0 @@
-/**************************************************************************
- *
- * Copyright 2010 Pauli Nieminen.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- *
- **************************************************************************/
-/*
- * Multipart buffer for coping data which is larger than the page size.
- *
- * Authors:
- * Pauli Nieminen <suokkos-at-gmail-dot-com>
- */
-
-#ifndef _DRM_BUFFER_H_
-#define _DRM_BUFFER_H_
-
-#include <drm/drmP.h>
-
-struct drm_buffer {
- int iterator;
- int size;
- char *data[];
-};
-
-
-/**
- * Return the index of page that buffer is currently pointing at.
- */
-static inline int drm_buffer_page(struct drm_buffer *buf)
-{
- return buf->iterator / PAGE_SIZE;
-}
-/**
- * Return the index of the current byte in the page
- */
-static inline int drm_buffer_index(struct drm_buffer *buf)
-{
- return buf->iterator & (PAGE_SIZE - 1);
-}
-/**
- * Return number of bytes that is left to process
- */
-static inline int drm_buffer_unprocessed(struct drm_buffer *buf)
-{
- return buf->size - buf->iterator;
-}
-
-/**
- * Advance the buffer iterator number of bytes that is given.
- */
-static inline void drm_buffer_advance(struct drm_buffer *buf, int bytes)
-{
- buf->iterator += bytes;
-}
-
-/**
- * Allocate the drm buffer object.
- *
- * buf: A pointer to a pointer where the object is stored.
- * size: The number of bytes to allocate.
- */
-extern int drm_buffer_alloc(struct drm_buffer **buf, int size);
-
-/**
- * Copy the user data to the begin of the buffer and reset the processing
- * iterator.
- *
- * user_data: A pointer the data that is copied to the buffer.
- * size: The Number of bytes to copy.
- */
-extern int drm_buffer_copy_from_user(struct drm_buffer *buf,
- void __user *user_data, int size);
-
-/**
- * Free the drm buffer object
- */
-extern void drm_buffer_free(struct drm_buffer *buf);
-
-/**
- * Read an object from buffer that may be split to multiple parts. If object
- * is not split function just returns the pointer to object in buffer. But in
- * case of split object data is copied to given stack object that is suplied
- * by caller.
- *
- * The processing location of the buffer is also advanced to the next byte
- * after the object.
- *
- * objsize: The size of the objet in bytes.
- * stack_obj: A pointer to a memory location where object can be copied.
- */
-extern void *drm_buffer_read_object(struct drm_buffer *buf,
- int objsize, void *stack_obj);
-
-/**
- * Returns the pointer to the dword which is offset number of elements from the
- * current processing location.
- *
- * Caller must make sure that dword is not split in the buffer. This
- * requirement is easily met if all the sizes of objects in buffer are
- * multiples of dword and PAGE_SIZE is multiple dword.
- *
- * Call to this function doesn't change the processing location.
- *
- * offset: The index of the dword relative to the internat iterator.
- */
-static inline void *drm_buffer_pointer_to_dword(struct drm_buffer *buffer,
- int offset)
-{
- int iter = buffer->iterator + offset * 4;
- return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)];
-}
-/**
- * Returns the pointer to the dword which is offset number of elements from
- * the current processing location.
- *
- * Call to this function doesn't change the processing location.
- *
- * offset: The index of the byte relative to the internat iterator.
- */
-static inline void *drm_buffer_pointer_to_byte(struct drm_buffer *buffer,
- int offset)
-{
- int iter = buffer->iterator + offset;
- return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)];
-}
-
-#endif
--
2.1.0
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