Thomas Zimmermann
2021-Feb-04 20:03 UTC
[PATCH 0/6] drm: Move vmap out of commit tail for SHMEM-based drivers
Several SHMEM-based drivers use the BO as shadow buffer for the real framebuffer memory. Damage handling requires a vmap of the BO memory. But vmap/vunmap can acquire the dma-buf reservation lock, which is not allowed in commit tails. This patchset introduces a set of helpers that implement vmap/vunmap in the plane's prepare_fb and cleanup_fb; and provide the mapping's address to commit-tail functions. Wrappers for simple KMS are provides, as all of the involved drivers are built upon simple-KMS helpers. Patch 1 adds the support for private plane state to the simple-KMS helper library. Patch 2 provides plane state for shadow-buffered planes. It's a DRM plane with BO mappings into kernel address space. The involved helpers take care of the details. The code is independent from GEM SHMEM and can be used with other shadow-buffered planes. I put all this in a new file. In a later patch, drm_gem_fb_prepare_fb() et al could be moved there as well. Patches 3 to 6 convert each involved driver to the new helpers. The vmap operations are being removed from commit-tail functions. An additional benefit is that vmap errors are now detected before the commit starts. The original commit-tail functions could not handle failed vmap operations. I smoke-tested the code by running fbdev, Xorg and weston with the converted mgag200 driver. Thomas Zimmermann (6): drm/simple-kms: Add plane-state helpers drm: Add additional atomic helpers for shadow-buffered planes drm/mgag200: Move vmap out of commit tail drm/cirrus: Move vmap out of commit tail drm/gm12u320: Move vmap out of commit tail drm/udl: Move vmap out of commit tail Documentation/gpu/drm-kms-helpers.rst | 12 ++ drivers/gpu/drm/Makefile | 3 +- drivers/gpu/drm/drm_gem_atomic_helper.c | 210 ++++++++++++++++++++++++ drivers/gpu/drm/drm_simple_kms_helper.c | 40 ++++- drivers/gpu/drm/mgag200/mgag200_mode.c | 23 +-- drivers/gpu/drm/tiny/cirrus.c | 43 ++--- drivers/gpu/drm/tiny/gm12u320.c | 28 ++-- drivers/gpu/drm/udl/udl_modeset.c | 34 ++-- include/drm/drm_gem_atomic_helper.h | 75 +++++++++ include/drm/drm_simple_kms_helper.h | 28 ++++ 10 files changed, 415 insertions(+), 81 deletions(-) create mode 100644 drivers/gpu/drm/drm_gem_atomic_helper.c create mode 100644 include/drm/drm_gem_atomic_helper.h base-commit: f9173d6435c6a9bb0b0076ebf9122d876da208ae prerequisite-patch-id: c2b2f08f0eccc9f5df0c0da49fa1d36267deb11d prerequisite-patch-id: f8140f08b77c49beb6243d9a2a88ebcc7097e391 prerequisite-patch-id: 6bffaf03d01daeb29a0b0ffbc78b415e72907a17 prerequisite-patch-id: 6386ca949b8b677a7eada2672990dab2f84f734f prerequisite-patch-id: 706e35d0b2185d2332f725e1c22d8ffed910ea7b -- 2.30.0
Thomas Zimmermann
2021-Feb-04 20:03 UTC
[PATCH 1/6] drm/simple-kms: Add plane-state helpers
Just like regular plane-state helpers, drivers can use these new
callbacks to create and destroy private plane state.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/drm_simple_kms_helper.c | 40 +++++++++++++++++++++++--
include/drm/drm_simple_kms_helper.h | 28 +++++++++++++++++
2 files changed, 65 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c
b/drivers/gpu/drm/drm_simple_kms_helper.c
index 6ce8f5cd1eb5..0c5bb0f98fa0 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -253,13 +253,47 @@ static const struct drm_plane_helper_funcs
drm_simple_kms_plane_helper_funcs = {
.atomic_update = drm_simple_kms_plane_atomic_update,
};
+static void drm_simple_kms_plane_reset(struct drm_plane *plane)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+ if (!pipe->funcs || !pipe->funcs->reset_plane)
+ return drm_atomic_helper_plane_reset(plane);
+
+ return pipe->funcs->reset_plane(pipe);
+}
+
+static struct drm_plane_state *drm_simple_kms_plane_duplicate_state(struct
drm_plane *plane)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+ if (!pipe->funcs || !pipe->funcs->duplicate_plane_state)
+ return drm_atomic_helper_plane_duplicate_state(plane);
+
+ return pipe->funcs->duplicate_plane_state(pipe, plane->state);
+}
+
+static void drm_simple_kms_plane_destroy_state(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+ if (!pipe->funcs || !pipe->funcs->destroy_plane_state)
+ drm_atomic_helper_plane_destroy_state(plane, state);
+ else
+ pipe->funcs->destroy_plane_state(pipe, state);
+}
+
static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
.update_plane = drm_atomic_helper_update_plane,
.disable_plane = drm_atomic_helper_disable_plane,
.destroy = drm_plane_cleanup,
- .reset = drm_atomic_helper_plane_reset,
- .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+ .reset = drm_simple_kms_plane_reset,
+ .atomic_duplicate_state = drm_simple_kms_plane_duplicate_state,
+ .atomic_destroy_state = drm_simple_kms_plane_destroy_state,
.format_mod_supported = drm_simple_kms_format_mod_supported,
};
diff --git a/include/drm/drm_simple_kms_helper.h
b/include/drm/drm_simple_kms_helper.h
index e6dbf3161c2f..0c1a2e07caf2 100644
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -149,6 +149,34 @@ struct drm_simple_display_pipe_funcs {
* more details.
*/
void (*disable_vblank)(struct drm_simple_display_pipe *pipe);
+
+ /**
+ * @reset_plane:
+ *
+ * Optional, called by &drm_plane_funcs.reset. Please read the
+ * documentation for the &drm_plane_funcs.reset hook for more details.
+ */
+ void (*reset_plane)(struct drm_simple_display_pipe *pipe);
+
+ /**
+ * @duplicate_plane_state:
+ *
+ * Optional, called by &drm_plane_funcs.atomic_duplicate_state. Please
+ * read the documentation for the &drm_plane_funcs.atomic_duplicate_state
+ * hook for more details.
+ */
+ struct drm_plane_state * (*duplicate_plane_state)(struct
drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
+
+ /**
+ * @destroy_plane_state:
+ *
+ * Optional, called by &drm_plane_funcs.atomic_destroy_state. Please
+ * read the documentation for the &drm_plane_funcs.atomic_destroy_state
+ * hook for more details.
+ */
+ void (*destroy_plane_state)(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
};
/**
--
2.30.0
Thomas Zimmermann
2021-Feb-04 20:03 UTC
[PATCH 2/6] drm: Add additional atomic helpers for shadow-buffered planes
Several drivers use GEM buffer objects as shadow buffers for the actual
framebuffer memory. Right now, drivers do these vmap operations in their
commit tail, which is actually not allowed by the locking rules for
the dma-buf reservation lock. The involved BO has to be vmapped in the
plane's prepare_fb callback and vunmapped in cleanup_fb.
This patch introduces atomic helpers for such shadow planes. Plane
functions manage the plane state for shadow planes. The provided
implementations for prepare_fb and cleanup_fb vmap and vunmap all BOs of
struct drm_plane_state.fb. The mappings are afterwards available in the
plane's commit-tail functions.
For now, all rsp drivers use the simple KMS helpers, so we add the plane
callbacks and wrappers for simple KMS. The internal plane functions can
late rbe exported as needed.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
Documentation/gpu/drm-kms-helpers.rst | 12 ++
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/drm_gem_atomic_helper.c | 210 ++++++++++++++++++++++++
include/drm/drm_gem_atomic_helper.h | 75 +++++++++
4 files changed, 299 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/drm_gem_atomic_helper.c
create mode 100644 include/drm/drm_gem_atomic_helper.h
diff --git a/Documentation/gpu/drm-kms-helpers.rst
b/Documentation/gpu/drm-kms-helpers.rst
index b89ddd06dabb..389892f36185 100644
--- a/Documentation/gpu/drm-kms-helpers.rst
+++ b/Documentation/gpu/drm-kms-helpers.rst
@@ -80,6 +80,18 @@ Atomic State Helper Reference
.. kernel-doc:: drivers/gpu/drm/drm_atomic_state_helper.c
:export:
+GEM Atomic Helper Reference
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_atomic_helper.c
+ :doc: overview
+
+.. kernel-doc:: include/drm/drm_gem_atomic_helper.h
+ :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_atomic_helper.c
+ :export:
+
Simple KMS Helper Reference
==========================
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 926adef289db..02c229392345 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -44,7 +44,8 @@ drm_kms_helper-y := drm_bridge_connector.o drm_crtc_helper.o
drm_dp_helper.o \
drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
drm_simple_kms_helper.o drm_modeset_helper.o \
- drm_scdc_helper.o drm_gem_framebuffer_helper.o \
+ drm_scdc_helper.o drm_gem_atomic_helper.o \
+ drm_gem_framebuffer_helper.o \
drm_atomic_state_helper.o drm_damage_helper.o \
drm_format_helper.o drm_self_refresh_helper.o
diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c
b/drivers/gpu/drm/drm_gem_atomic_helper.c
new file mode 100644
index 000000000000..b6ad2b91a011
--- /dev/null
+++ b/drivers/gpu/drm/drm_gem_atomic_helper.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#include "drm_internal.h"
+
+/**
+ * DOC: overview
+ *
+ * The GEM atomic helpers library implements generic atomic-commit
+ * functions for drivers that use GEM objects. Currently, it provides
+ * plane state and framebuffer BO mappings for planes with shadow
+ * buffers.
+ */
+
+/*
+ * Shadow-buffered Planes
+ */
+
+static struct drm_plane_state *
+drm_gem_duplicate_shadow_plane_state(struct drm_plane *plane,
+ struct drm_plane_state *plane_state)
+{
+ struct drm_shadow_plane_state *new_shadow_plane_state;
+
+ if (!plane_state)
+ return NULL;
+
+ new_shadow_plane_state = kzalloc(sizeof(*new_shadow_plane_state), GFP_KERNEL);
+ if (!new_shadow_plane_state)
+ return NULL;
+ __drm_atomic_helper_plane_duplicate_state(plane,
&new_shadow_plane_state->base);
+
+ return &new_shadow_plane_state->base;
+}
+
+static void drm_gem_destroy_shadow_plane_state(struct drm_plane *plane,
+ struct drm_plane_state *plane_state)
+{
+ struct drm_shadow_plane_state *shadow_plane_state +
to_drm_shadow_plane_state(plane_state);
+
+ __drm_atomic_helper_plane_destroy_state(&shadow_plane_state->base);
+ kfree(shadow_plane_state);
+}
+
+static void drm_gem_reset_shadow_plane(struct drm_plane *plane)
+{
+ struct drm_shadow_plane_state *shadow_plane_state;
+
+ if (plane->state) {
+ drm_gem_destroy_shadow_plane_state(plane, plane->state);
+ plane->state = NULL; /* must be set to NULL here */
+ }
+
+ shadow_plane_state = kzalloc(sizeof(*shadow_plane_state), GFP_KERNEL);
+ if (!shadow_plane_state)
+ return;
+ __drm_atomic_helper_plane_reset(plane, &shadow_plane_state->base);
+}
+
+static int drm_gem_prepare_shadow_fb(struct drm_plane *plane, struct
drm_plane_state *plane_state)
+{
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
+ struct drm_framebuffer *fb = plane_state->fb;
+ struct drm_gem_object *obj;
+ struct dma_buf_map map;
+ int ret;
+ size_t i;
+
+ if (!fb)
+ return 0;
+
+ ret = drm_gem_fb_prepare_fb(plane, plane_state);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(shadow_plane_state->map); ++i) {
+ obj = drm_gem_fb_get_obj(fb, i);
+ if (!obj)
+ continue;
+ ret = drm_gem_vmap(obj, &map);
+ if (ret)
+ goto err_drm_gem_vunmap;
+ shadow_plane_state->map[i] = map;
+ }
+
+ return 0;
+
+err_drm_gem_vunmap:
+ while (i) {
+ --i;
+ obj = drm_gem_fb_get_obj(fb, i);
+ if (!obj)
+ continue;
+ drm_gem_vunmap(obj, &shadow_plane_state->map[i]);
+ }
+ return ret;
+}
+
+static void drm_gem_cleanup_shadow_fb(struct drm_plane *plane, struct
drm_plane_state *plane_state)
+{
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
+ struct drm_framebuffer *fb = plane_state->fb;
+ size_t i = ARRAY_SIZE(shadow_plane_state->map);
+ struct drm_gem_object *obj;
+
+ if (!fb)
+ return;
+
+ while (i) {
+ --i;
+ obj = drm_gem_fb_get_obj(fb, i);
+ if (!obj)
+ continue;
+ drm_gem_vunmap(obj, &shadow_plane_state->map[i]);
+ }
+}
+
+/**
+ * drm_gem_simple_kms_prepare_shadow_fb - prepares shadow framebuffers
+ * @pipe: the simple display pipe
+ * @plane_state: the plane state of type struct drm_shadow_plane_state
+ *
+ * This function implements struct drm_simple_display_funcs.prepare_fb. It
+ * maps all buffer objects of the plane's framebuffer into kernel address
+ * space and stores them in struct drm_shadow_plane_state.map. The
+ * framebuffer will be synchronized as part of the atomic commit.
+ *
+ * See drm_gem_simple_kms_cleanup_shadow_fb() for cleanup.
+ *
+ * Returns:
+ * 0 on success, or a negative errno code otherwise.
+ */
+int drm_gem_simple_kms_prepare_shadow_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state)
+{
+ return drm_gem_prepare_shadow_fb(&pipe->plane, plane_state);
+}
+EXPORT_SYMBOL(drm_gem_simple_kms_prepare_shadow_fb);
+
+/**
+ * drm_gem_simple_kms_cleanup_shadow_fb - releases shadow framebuffers
+ * @pipe: the simple display pipe
+ * @plane_state: the plane state of type struct drm_shadow_plane_state
+ *
+ * This function implements struct drm_simple_display_funcs.prepare_fb.
+ * This function unmaps all buffer objects of the plane's framebuffer.
+ *
+ * See drm_gem_simple_kms_prepare_shadow_fb().
+ */
+void drm_gem_simple_kms_cleanup_shadow_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state)
+{
+ drm_gem_cleanup_shadow_fb(&pipe->plane, plane_state);
+}
+EXPORT_SYMBOL(drm_gem_simple_kms_cleanup_shadow_fb);
+
+/**
+ * drm_gem_simple_kms_reset_shadow_plane - resets a shadow-buffered plane
+ * @pipe: the simple display pipe
+ *
+ * This function implements struct drm_simple_display_funcs.reset_plane
+ * for shadow-buffered planes.
+ */
+void drm_gem_simple_kms_reset_shadow_plane(struct drm_simple_display_pipe
*pipe)
+{
+ drm_gem_reset_shadow_plane(&pipe->plane);
+}
+EXPORT_SYMBOL(drm_gem_simple_kms_reset_shadow_plane);
+
+/**
+ * drm_gem_simple_kms_duplicate_shadow_plane_state - duplicates shadow-buffered
plane state
+ * @pipe: the simple display pipe
+ * @plane_state: the plane state of type struct drm_shadow_plane_state
+ *
+ * This function implements struct
drm_simple_display_funcs.duplicate_plane_state
+ * for shadow-buffered planes. It does not duplicate existing mappings of the
shadow
+ * buffers. Mappings are maintained during the atomic commit by the plane's
prepare_fb
+ * and cleanup_fb helpers.
+ *
+ * Returns:
+ * A pointer to a new plane state on success, or NULL otherwise.
+ */
+struct drm_plane_state *
+drm_gem_simple_kms_duplicate_shadow_plane_state(struct drm_simple_display_pipe
*pipe,
+ struct drm_plane_state *plane_state)
+{
+ return drm_gem_duplicate_shadow_plane_state(&pipe->plane, plane_state);
+}
+EXPORT_SYMBOL(drm_gem_simple_kms_duplicate_shadow_plane_state);
+
+/**
+ * drm_gem_simple_kms_cleanup_shadow_fb - resets shadow-buffered plane state
+ * @pipe: the simple display pipe
+ * @plane_state: the plane state of type struct drm_shadow_plane_state
+ *
+ * This function implements struct drm_simple_display_funcs.reset_plane
+ * for shadow-buffered planes. It expects that mappings of shadow buffers
+ * have been released already.
+ */
+void drm_gem_simple_kms_destroy_shadow_plane_state(struct
drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state)
+{
+ drm_gem_destroy_shadow_plane_state(&pipe->plane, plane_state);
+}
+EXPORT_SYMBOL(drm_gem_simple_kms_destroy_shadow_plane_state);
diff --git a/include/drm/drm_gem_atomic_helper.h
b/include/drm/drm_gem_atomic_helper.h
new file mode 100644
index 000000000000..a5923983acaf
--- /dev/null
+++ b/include/drm/drm_gem_atomic_helper.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __DRM_GEM_ATOMIC_HELPER_H__
+#define __DRM_GEM_ATOMIC_HELPER_H__
+
+#include <linux/dma-buf-map.h>
+
+#include <drm/drm_plane.h>
+
+struct drm_simple_display_pipe;
+
+/*
+ * Helpers for planes with shadow buffers
+ */
+
+/**
+ * struct drm_shadow_plane_state - plane state for planes with shadow buffers
+ *
+ * For planes that use a shadow buffer, struct drm_shadow_plane_state
+ * provides the regular plane state plus mappings of the shadow buffer
+ * into kernel address space.
+ */
+struct drm_shadow_plane_state {
+ /** @base: plane state */
+ struct drm_plane_state base;
+
+ /* Transitional state - do not export or duplicate */
+
+ /**
+ * @map: Mappings of the plane's framebuffer BOs in to kernel address
space
+ *
+ * The memory mappings stored in map should be established in the plane's
+ * prepare_fb callback and removed in the cleanup_fb callback.
+ */
+ struct dma_buf_map map[4];
+};
+
+/**
+ * to_drm_shadow_plane_state - upcasts from struct drm_plane_state
+ * @state: the plane state
+ */
+static inline struct drm_shadow_plane_state *
+to_drm_shadow_plane_state(struct drm_plane_state *state)
+{
+ return container_of(state, struct drm_shadow_plane_state, base);
+}
+
+int drm_gem_simple_kms_prepare_shadow_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
+void drm_gem_simple_kms_cleanup_shadow_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
+void drm_gem_simple_kms_reset_shadow_plane(struct drm_simple_display_pipe
*pipe);
+struct drm_plane_state *
+drm_gem_simple_kms_duplicate_shadow_plane_state(struct drm_simple_display_pipe
*pipe,
+ struct drm_plane_state *plane_state);
+void
+drm_gem_simple_kms_destroy_shadow_plane_state(struct drm_simple_display_pipe
*pipe,
+ struct drm_plane_state *plane_state);
+
+/**
+ * DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS -
+ * Initializes struct drm_simple_display_pipe_funcs for shadow-buffered planes
+ *
+ * Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
+ * macro initializes struct drm_simple_display_pipe_funcs to use the rsp helper
+ * functions.
+ */
+#define DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS \
+ .prepare_fb = drm_gem_simple_kms_prepare_shadow_fb, \
+ .cleanup_fb = drm_gem_simple_kms_cleanup_shadow_fb, \
+ .reset_plane = drm_gem_simple_kms_reset_shadow_plane, \
+ .duplicate_plane_state = drm_gem_simple_kms_duplicate_shadow_plane_state, \
+ .destroy_plane_state = drm_gem_simple_kms_destroy_shadow_plane_state
+
+#endif /* __DRM_GEM_ATOMIC_HELPER_H__ */
--
2.30.0
Thomas Zimmermann
2021-Feb-04 20:03 UTC
[PATCH 3/6] drm/mgag200: Move vmap out of commit tail
Vmap operations may acquire the dmabuf reservation lock, which is not
allowed within atomic commit-tail functions. Therefore move vmap and
vunmap from the damage handler into prepare_fb and cleanup_fb callbacks.
The mapping is provided as GEM shadow-buffered plane. The functions in
the commit tail use the pre-established mapping for damage handling.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/mgag200/mgag200_mode.c | 23 ++++++++---------------
1 file changed, 8 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c
b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 1dfc42170059..f871753e898e 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -17,6 +17,7 @@
#include <drm/drm_damage_helper.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_print.h>
@@ -1549,22 +1550,12 @@ mgag200_simple_display_pipe_mode_valid(struct
drm_simple_display_pipe *pipe,
static void
mgag200_handle_damage(struct mga_device *mdev, struct drm_framebuffer *fb,
- struct drm_rect *clip)
+ struct drm_rect *clip, const struct dma_buf_map *map)
{
- struct drm_device *dev = &mdev->base;
- struct dma_buf_map map;
- void *vmap;
- int ret;
-
- ret = drm_gem_shmem_vmap(fb->obj[0], &map);
- if (drm_WARN_ON(dev, ret))
- return; /* BUG: SHMEM BO should always be vmapped */
- vmap = map.vaddr; /* TODO: Use mapping abstraction properly */
+ void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
drm_fb_memcpy_dstclip(mdev->vram, vmap, fb, clip);
- drm_gem_shmem_vunmap(fb->obj[0], &map);
-
/* Always scanout image at VRAM offset 0 */
mgag200_set_startadd(mdev, (u32)0);
mgag200_set_offset(mdev, fb);
@@ -1580,6 +1571,7 @@ mgag200_simple_display_pipe_enable(struct
drm_simple_display_pipe *pipe,
struct mga_device *mdev = to_mga_device(dev);
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
struct drm_framebuffer *fb = plane_state->fb;
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
struct drm_rect fullscreen = {
.x1 = 0,
.x2 = fb->width,
@@ -1608,7 +1600,7 @@ mgag200_simple_display_pipe_enable(struct
drm_simple_display_pipe *pipe,
mga_crtc_load_lut(crtc);
mgag200_enable_display(mdev);
- mgag200_handle_damage(mdev, fb, &fullscreen);
+ mgag200_handle_damage(mdev, fb, &fullscreen,
&shadow_plane_state->map[0]);
}
static void
@@ -1649,6 +1641,7 @@ mgag200_simple_display_pipe_update(struct
drm_simple_display_pipe *pipe,
struct drm_device *dev = plane->dev;
struct mga_device *mdev = to_mga_device(dev);
struct drm_plane_state *state = plane->state;
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(state);
struct drm_framebuffer *fb = state->fb;
struct drm_rect damage;
@@ -1656,7 +1649,7 @@ mgag200_simple_display_pipe_update(struct
drm_simple_display_pipe *pipe,
return;
if (drm_atomic_helper_damage_merged(old_state, state, &damage))
- mgag200_handle_damage(mdev, fb, &damage);
+ mgag200_handle_damage(mdev, fb, &damage,
&shadow_plane_state->map[0]);
}
static const struct drm_simple_display_pipe_funcs
@@ -1666,7 +1659,7 @@ mgag200_simple_display_pipe_funcs = {
.disable = mgag200_simple_display_pipe_disable,
.check = mgag200_simple_display_pipe_check,
.update = mgag200_simple_display_pipe_update,
- .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
+ DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
};
static const uint32_t mgag200_simple_display_pipe_formats[] = {
--
2.30.0
Thomas Zimmermann
2021-Feb-04 20:03 UTC
[PATCH 4/6] drm/cirrus: Move vmap out of commit tail
Vmap operations may acquire the dmabuf reservation lock, which is not
allowed within atomic commit-tail functions. Therefore move vmap and
vunmap from the damage handler into prepare_fb and cleanup_fb callbacks.
The mapping is provided as GEM shadow-buffered plane. The functions in
the commit tail use the pre-established mapping for damage handling.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/tiny/cirrus.c | 43 ++++++++++++++---------------------
1 file changed, 17 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
index a043e602199e..ad922c3ec681 100644
--- a/drivers/gpu/drm/tiny/cirrus.c
+++ b/drivers/gpu/drm/tiny/cirrus.c
@@ -33,8 +33,9 @@
#include <drm/drm_file.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
-#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
@@ -311,22 +312,15 @@ static int cirrus_mode_set(struct cirrus_device *cirrus,
return 0;
}
-static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
+static int cirrus_fb_blit_rect(struct drm_framebuffer *fb, const struct
dma_buf_map *map,
struct drm_rect *rect)
{
struct cirrus_device *cirrus = to_cirrus(fb->dev);
- struct dma_buf_map map;
- void *vmap;
- int idx, ret;
+ void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
+ int idx;
- ret = -ENODEV;
if (!drm_dev_enter(&cirrus->dev, &idx))
- goto out;
-
- ret = drm_gem_shmem_vmap(fb->obj[0], &map);
- if (ret)
- goto out_dev_exit;
- vmap = map.vaddr; /* TODO: Use mapping abstraction properly */
+ return -ENODEV;
if (cirrus->cpp == fb->format->cpp[0])
drm_fb_memcpy_dstclip(cirrus->vram,
@@ -345,16 +339,12 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
else
WARN_ON_ONCE("cpp mismatch");
- drm_gem_shmem_vunmap(fb->obj[0], &map);
- ret = 0;
-
-out_dev_exit:
drm_dev_exit(idx);
-out:
- return ret;
+
+ return 0;
}
-static int cirrus_fb_blit_fullscreen(struct drm_framebuffer *fb)
+static int cirrus_fb_blit_fullscreen(struct drm_framebuffer *fb, const struct
dma_buf_map *map)
{
struct drm_rect fullscreen = {
.x1 = 0,
@@ -362,7 +352,7 @@ static int cirrus_fb_blit_fullscreen(struct drm_framebuffer
*fb)
.y1 = 0,
.y2 = fb->height,
};
- return cirrus_fb_blit_rect(fb, &fullscreen);
+ return cirrus_fb_blit_rect(fb, map, &fullscreen);
}
static int cirrus_check_size(int width, int height,
@@ -441,9 +431,10 @@ static void cirrus_pipe_enable(struct
drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state)
{
struct cirrus_device *cirrus = to_cirrus(pipe->crtc.dev);
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
cirrus_mode_set(cirrus, &crtc_state->mode, plane_state->fb);
- cirrus_fb_blit_fullscreen(plane_state->fb);
+ cirrus_fb_blit_fullscreen(plane_state->fb,
&shadow_plane_state->map[0]);
}
static void cirrus_pipe_update(struct drm_simple_display_pipe *pipe,
@@ -451,16 +442,15 @@ static void cirrus_pipe_update(struct
drm_simple_display_pipe *pipe,
{
struct cirrus_device *cirrus = to_cirrus(pipe->crtc.dev);
struct drm_plane_state *state = pipe->plane.state;
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(state);
struct drm_crtc *crtc = &pipe->crtc;
struct drm_rect rect;
- if (pipe->plane.state->fb &&
- cirrus->cpp != cirrus_cpp(pipe->plane.state->fb))
- cirrus_mode_set(cirrus, &crtc->mode,
- pipe->plane.state->fb);
+ if (state->fb && cirrus->cpp != cirrus_cpp(state->fb))
+ cirrus_mode_set(cirrus, &crtc->mode, state->fb);
if (drm_atomic_helper_damage_merged(old_state, state, &rect))
- cirrus_fb_blit_rect(pipe->plane.state->fb, &rect);
+ cirrus_fb_blit_rect(state->fb, &shadow_plane_state->map[0],
&rect);
}
static const struct drm_simple_display_pipe_funcs cirrus_pipe_funcs = {
@@ -468,6 +458,7 @@ static const struct drm_simple_display_pipe_funcs
cirrus_pipe_funcs = {
.check = cirrus_pipe_check,
.enable = cirrus_pipe_enable,
.update = cirrus_pipe_update,
+ DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
};
static const uint32_t cirrus_formats[] = {
--
2.30.0
Thomas Zimmermann
2021-Feb-04 20:03 UTC
[PATCH 5/6] drm/gm12u320: Move vmap out of commit tail
Vmap operations may acquire the dmabuf reservation lock, which is not
allowed within atomic commit-tail functions. Therefore move vmap and
vunmap from the damage handler into prepare_fb and cleanup_fb callbacks.
The mapping is provided as GEM shadow-buffered plane. The functions in
the commit tail use the pre-established mapping for damage handling.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/tiny/gm12u320.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c
index 33f65f4626e5..0b4f4f2af1ef 100644
--- a/drivers/gpu/drm/tiny/gm12u320.c
+++ b/drivers/gpu/drm/tiny/gm12u320.c
@@ -16,8 +16,9 @@
#include <drm/drm_file.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
-#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
@@ -94,6 +95,7 @@ struct gm12u320_device {
struct drm_rect rect;
int frame;
int draw_status_timeout;
+ struct dma_buf_map src_map;
} fb_update;
};
@@ -250,7 +252,6 @@ static void gm12u320_copy_fb_to_blocks(struct
gm12u320_device *gm12u320)
{
int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
struct drm_framebuffer *fb;
- struct dma_buf_map map;
void *vaddr;
u8 *src;
@@ -264,20 +265,14 @@ static void gm12u320_copy_fb_to_blocks(struct
gm12u320_device *gm12u320)
x2 = gm12u320->fb_update.rect.x2;
y1 = gm12u320->fb_update.rect.y1;
y2 = gm12u320->fb_update.rect.y2;
-
- ret = drm_gem_shmem_vmap(fb->obj[0], &map);
- if (ret) {
- GM12U320_ERR("failed to vmap fb: %d\n", ret);
- goto put_fb;
- }
- vaddr = map.vaddr; /* TODO: Use mapping abstraction properly */
+ vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction
properly */
if (fb->obj[0]->import_attach) {
ret = dma_buf_begin_cpu_access(
fb->obj[0]->import_attach->dmabuf, DMA_FROM_DEVICE);
if (ret) {
GM12U320_ERR("dma_buf_begin_cpu_access err: %d\n", ret);
- goto vunmap;
+ goto put_fb;
}
}
@@ -321,8 +316,6 @@ static void gm12u320_copy_fb_to_blocks(struct
gm12u320_device *gm12u320)
if (ret)
GM12U320_ERR("dma_buf_end_cpu_access err: %d\n", ret);
}
-vunmap:
- drm_gem_shmem_vunmap(fb->obj[0], &map);
put_fb:
drm_framebuffer_put(fb);
gm12u320->fb_update.fb = NULL;
@@ -410,7 +403,7 @@ static void gm12u320_fb_update_work(struct work_struct
*work)
GM12U320_ERR("Frame update error: %d\n", ret);
}
-static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
+static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb, const struct
dma_buf_map *map,
struct drm_rect *dirty)
{
struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
@@ -424,6 +417,7 @@ static void gm12u320_fb_mark_dirty(struct drm_framebuffer
*fb,
drm_framebuffer_get(fb);
gm12u320->fb_update.fb = fb;
gm12u320->fb_update.rect = *dirty;
+ gm12u320->fb_update.src_map = *map;
wakeup = true;
} else {
struct drm_rect *rect = &gm12u320->fb_update.rect;
@@ -452,6 +446,7 @@ static void gm12u320_stop_fb_update(struct gm12u320_device
*gm12u320)
mutex_lock(&gm12u320->fb_update.lock);
old_fb = gm12u320->fb_update.fb;
gm12u320->fb_update.fb = NULL;
+ dma_buf_map_clear(&gm12u320->fb_update.src_map);
mutex_unlock(&gm12u320->fb_update.lock);
drm_framebuffer_put(old_fb);
@@ -564,9 +559,10 @@ static void gm12u320_pipe_enable(struct
drm_simple_display_pipe *pipe,
{
struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
- gm12u320_fb_mark_dirty(plane_state->fb, &rect);
+ gm12u320_fb_mark_dirty(plane_state->fb, &shadow_plane_state->map[0],
&rect);
}
static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
@@ -580,16 +576,18 @@ static void gm12u320_pipe_update(struct
drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state)
{
struct drm_plane_state *state = pipe->plane.state;
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(state);
struct drm_rect rect;
if (drm_atomic_helper_damage_merged(old_state, state, &rect))
- gm12u320_fb_mark_dirty(pipe->plane.state->fb, &rect);
+ gm12u320_fb_mark_dirty(state->fb, &shadow_plane_state->map[0],
&rect);
}
static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
.enable = gm12u320_pipe_enable,
.disable = gm12u320_pipe_disable,
.update = gm12u320_pipe_update,
+ DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
};
static const uint32_t gm12u320_pipe_formats[] = {
--
2.30.0
Vmap operations may acquire the dmabuf reservation lock, which is not
allowed within atomic commit-tail functions. Therefore move vmap and
vunmap from the damage handler into prepare_fb and cleanup_fb callbacks.
The mapping is provided as GEM shadow-buffered plane. The functions in
the commit tail use the pre-established mapping for damage handling.
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/udl/udl_modeset.c | 34 ++++++++++++-------------------
1 file changed, 13 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/udl/udl_modeset.c
b/drivers/gpu/drm/udl/udl_modeset.c
index 9d34ec9d03f6..8d98bf69d075 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -15,6 +15,7 @@
#include <drm/drm_crtc_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_modeset_helper_vtables.h>
@@ -266,18 +267,17 @@ static int udl_aligned_damage_clip(struct drm_rect *clip,
int x, int y,
return 0;
}
-static int udl_handle_damage(struct drm_framebuffer *fb, int x, int y,
- int width, int height)
+static int udl_handle_damage(struct drm_framebuffer *fb, const struct
dma_buf_map *map,
+ int x, int y, int width, int height)
{
struct drm_device *dev = fb->dev;
struct dma_buf_attachment *import_attach = fb->obj[0]->import_attach;
+ void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */
int i, ret, tmp_ret;
char *cmd;
struct urb *urb;
struct drm_rect clip;
int log_bpp;
- struct dma_buf_map map;
- void *vaddr;
ret = udl_log_cpp(fb->format->cpp[0]);
if (ret < 0)
@@ -297,17 +297,10 @@ static int udl_handle_damage(struct drm_framebuffer *fb,
int x, int y,
return ret;
}
- ret = drm_gem_shmem_vmap(fb->obj[0], &map);
- if (ret) {
- DRM_ERROR("failed to vmap fb\n");
- goto out_dma_buf_end_cpu_access;
- }
- vaddr = map.vaddr; /* TODO: Use mapping abstraction properly */
-
urb = udl_get_urb(dev);
if (!urb) {
ret = -ENOMEM;
- goto out_drm_gem_shmem_vunmap;
+ goto out_dma_buf_end_cpu_access;
}
cmd = urb->transfer_buffer;
@@ -320,7 +313,7 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int
x, int y,
&cmd, byte_offset, dev_byte_offset,
byte_width);
if (ret)
- goto out_drm_gem_shmem_vunmap;
+ goto out_dma_buf_end_cpu_access;
}
if (cmd > (char *)urb->transfer_buffer) {
@@ -336,8 +329,6 @@ static int udl_handle_damage(struct drm_framebuffer *fb, int
x, int y,
ret = 0;
-out_drm_gem_shmem_vunmap:
- drm_gem_shmem_vunmap(fb->obj[0], &map);
out_dma_buf_end_cpu_access:
if (import_attach) {
tmp_ret = dma_buf_end_cpu_access(import_attach->dmabuf,
@@ -375,6 +366,7 @@ udl_simple_display_pipe_enable(struct
drm_simple_display_pipe *pipe,
struct drm_framebuffer *fb = plane_state->fb;
struct udl_device *udl = to_udl(dev);
struct drm_display_mode *mode = &crtc_state->mode;
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
char *buf;
char *wrptr;
int color_depth = UDL_COLOR_DEPTH_16BPP;
@@ -400,7 +392,7 @@ udl_simple_display_pipe_enable(struct
drm_simple_display_pipe *pipe,
udl->mode_buf_len = wrptr - buf;
- udl_handle_damage(fb, 0, 0, fb->width, fb->height);
+ udl_handle_damage(fb, &shadow_plane_state->map[0], 0, 0, fb->width,
fb->height);
if (!crtc_state->mode_changed)
return;
@@ -435,6 +427,7 @@ udl_simple_display_pipe_update(struct
drm_simple_display_pipe *pipe,
struct drm_plane_state *old_plane_state)
{
struct drm_plane_state *state = pipe->plane.state;
+ struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(state);
struct drm_framebuffer *fb = state->fb;
struct drm_rect rect;
@@ -442,17 +435,16 @@ udl_simple_display_pipe_update(struct
drm_simple_display_pipe *pipe,
return;
if (drm_atomic_helper_damage_merged(old_plane_state, state, &rect))
- udl_handle_damage(fb, rect.x1, rect.y1, rect.x2 - rect.x1,
- rect.y2 - rect.y1);
+ udl_handle_damage(fb, &shadow_plane_state->map[0], rect.x1, rect.y1,
+ rect.x2 - rect.x1, rect.y2 - rect.y1);
}
-static const
-struct drm_simple_display_pipe_funcs udl_simple_display_pipe_funcs = {
+static const struct drm_simple_display_pipe_funcs udl_simple_display_pipe_funcs
= {
.mode_valid = udl_simple_display_pipe_mode_valid,
.enable = udl_simple_display_pipe_enable,
.disable = udl_simple_display_pipe_disable,
.update = udl_simple_display_pipe_update,
- .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
+ DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
};
/*
--
2.30.0
Gerd Hoffmann
2021-Feb-05 09:05 UTC
[PATCH 0/6] drm: Move vmap out of commit tail for SHMEM-based drivers
Hi,> I smoke-tested the code by running fbdev, Xorg and weston with the > converted mgag200 driver.Looks sane to me. Survived cirrus smoke test too. Tested-by: Gerd Hoffmann <kraxel at redhat.com> Acked-by: Gerd Hoffmann <kraxel at redhat.com> take care, Gerd