diff mbox series

[v3] drm/ssd130x: Store the HW buffer in the driver-private CRTC state

Message ID 20230912110946.944791-1-javierm@redhat.com
State New
Headers
Series [v3] drm/ssd130x: Store the HW buffer in the driver-private CRTC state |

Commit Message

Javier Martinez Canillas Sept. 12, 2023, 11:09 a.m. UTC 
  The commit 45b58669e532 ("drm/ssd130x: Allocate buffer in the plane's
.atomic_check() callback") moved the allocation of the intermediate and
HW buffers from the encoder's .atomic_enable callback, to the plane's
.atomic_check callback.

This was suggested by Maxime Ripard, because drivers aren't allowed to
fail after the drm_atomic_helper_swap_state() function has been called.

And the encoder's .atomic_enable happens after the new atomic state has
been swapped, so allocations (that can fail) shouldn't be done there.

But the HW buffer isn't really tied to the plane's state. It has a fixed
size that only depends on the (also fixed) display resolution defined in
the Device Tree Blob.

That buffer can be considered part of the CRTC state, and for this reason
makes more sense to do its allocation in the CRTC .atomic_check callback.

The other allocated buffer (used to store a conversion from the emulated
XR24 format to the native R1 format) is part of the plane's state, since
it will be optional once the driver supports R1 and allows user-space to
set that pixel format.

So let's keep the allocation for it in the plane's .atomic_check callback,
this can't be moved to the CRTC's .atomic_check because changing a format
does not trigger a CRTC mode set.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/dri-devel/CAMuHMdWv_QSatDgihr8=2SXHhvp=icNxumZcZOPwT9Q_QiogNQ@mail.gmail.com/
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

Changes in v3:
- Call drm_atomic_get_crtc_state() in the plane's .atomic_check (Maxime Ripard).

Changes in v2:
- Drop RFC prefix.
- Fix typo in commit message (Thomas Zimmermann).
- Store the HW buffer in the driver's private CRTC state (Thomas Zimmermann).
- Just use kmalloc() kcalloc() when allocating buffers (Thomas Zimmermann).
- Keep the allocation of the intermediate buffer in the plane's .atomic_check

 drivers/gpu/drm/solomon/ssd130x.c | 152 +++++++++++++++++++++++-------
 1 file changed, 117 insertions(+), 35 deletions(-)

Comments

kernel test robot Sept. 12, 2023, 9:49 p.m. UTC | #1 
Hi Javier,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[cannot apply to linus/master v6.6-rc1 next-20230912]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Javier-Martinez-Canillas/drm-ssd130x-Store-the-HW-buffer-in-the-driver-private-CRTC-state/20230912-191205
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230912110946.944791-1-javierm%40redhat.com
patch subject: [PATCH v3] drm/ssd130x: Store the HW buffer in the driver-private CRTC state
config: i386-randconfig-063-20230913 (https://download.01.org/0day-ci/archive/20230913/202309130552.3IV4BeIj-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230913/202309130552.3IV4BeIj-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309130552.3IV4BeIj-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/solomon/ssd130x.c:810:5: sparse: sparse: symbol 'ssd130x_crtc_helper_atomic_check' was not declared. Should it be static?
diff mbox series

Patch

diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index 3b4dde09538a..4204a69f4c74 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -141,14 +141,23 @@  const struct ssd130x_deviceinfo ssd130x_variants[] = {
 };
 EXPORT_SYMBOL_NS_GPL(ssd130x_variants, DRM_SSD130X);
 
+struct ssd130x_crtc_state {
+	struct drm_crtc_state base;
+	/* Buffer to store pixels in HW format and written to the panel */
+	u8 *data_array;
+};
+
 struct ssd130x_plane_state {
 	struct drm_shadow_plane_state base;
 	/* Intermediate buffer to convert pixels from XRGB8888 to HW format */
 	u8 *buffer;
-	/* Buffer to store pixels in HW format and written to the panel */
-	u8 *data_array;
 };
 
+static inline struct ssd130x_crtc_state *to_ssd130x_crtc_state(struct drm_crtc_state *state)
+{
+	return container_of(state, struct ssd130x_crtc_state, base);
+}
+
 static inline struct ssd130x_plane_state *to_ssd130x_plane_state(struct drm_plane_state *state)
 {
 	return container_of(state, struct ssd130x_plane_state, base.base);
@@ -448,13 +457,11 @@  static int ssd130x_init(struct ssd130x_device *ssd130x)
 }
 
 static int ssd130x_update_rect(struct ssd130x_device *ssd130x,
-			       struct ssd130x_plane_state *ssd130x_state,
-			       struct drm_rect *rect)
+			       struct drm_rect *rect, u8 *buf,
+			       u8 *data_array)
 {
 	unsigned int x = rect->x1;
 	unsigned int y = rect->y1;
-	u8 *buf = ssd130x_state->buffer;
-	u8 *data_array = ssd130x_state->data_array;
 	unsigned int width = drm_rect_width(rect);
 	unsigned int height = drm_rect_height(rect);
 	unsigned int line_length = DIV_ROUND_UP(width, 8);
@@ -550,12 +557,10 @@  static int ssd130x_update_rect(struct ssd130x_device *ssd130x,
 	return ret;
 }
 
-static void ssd130x_clear_screen(struct ssd130x_device *ssd130x,
-				 struct ssd130x_plane_state *ssd130x_state)
+static void ssd130x_clear_screen(struct ssd130x_device *ssd130x, u8 *data_array)
 {
 	unsigned int page_height = ssd130x->device_info->page_height;
 	unsigned int pages = DIV_ROUND_UP(ssd130x->height, page_height);
-	u8 *data_array = ssd130x_state->data_array;
 	unsigned int width = ssd130x->width;
 	int ret, i;
 
@@ -594,15 +599,13 @@  static void ssd130x_clear_screen(struct ssd130x_device *ssd130x,
 	}
 }
 
-static int ssd130x_fb_blit_rect(struct drm_plane_state *state,
+static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb,
 				const struct iosys_map *vmap,
-				struct drm_rect *rect)
+				struct drm_rect *rect,
+				u8 *buf, u8 *data_array)
 {
-	struct drm_framebuffer *fb = state->fb;
 	struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
 	unsigned int page_height = ssd130x->device_info->page_height;
-	struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(state);
-	u8 *buf = ssd130x_state->buffer;
 	struct iosys_map dst;
 	unsigned int dst_pitch;
 	int ret = 0;
@@ -622,7 +625,7 @@  static int ssd130x_fb_blit_rect(struct drm_plane_state *state,
 
 	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
 
-	ssd130x_update_rect(ssd130x, ssd130x_state, rect);
+	ssd130x_update_rect(ssd130x, rect, buf, data_array);
 
 	return ret;
 }
@@ -634,12 +637,19 @@  static int ssd130x_primary_plane_helper_atomic_check(struct drm_plane *plane,
 	struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
 	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
 	struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane_state);
-	unsigned int page_height = ssd130x->device_info->page_height;
-	unsigned int pages = DIV_ROUND_UP(ssd130x->height, page_height);
+	struct drm_crtc *crtc = plane_state->crtc;
+	struct drm_crtc_state *crtc_state;
 	const struct drm_format_info *fi;
 	unsigned int pitch;
 	int ret;
 
+	if (!crtc)
+		return -EINVAL;
+
+	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
 	ret = drm_plane_helper_atomic_check(plane, state);
 	if (ret)
 		return ret;
@@ -654,14 +664,6 @@  static int ssd130x_primary_plane_helper_atomic_check(struct drm_plane *plane,
 	if (!ssd130x_state->buffer)
 		return -ENOMEM;
 
-	ssd130x_state->data_array = kcalloc(ssd130x->width, pages, GFP_KERNEL);
-	if (!ssd130x_state->data_array) {
-		kfree(ssd130x_state->buffer);
-		/* Set to prevent a double free in .atomic_destroy_state() */
-		ssd130x_state->buffer = NULL;
-		return -ENOMEM;
-	}
-
 	return 0;
 }
 
@@ -671,6 +673,10 @@  static void ssd130x_primary_plane_helper_atomic_update(struct drm_plane *plane,
 	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
 	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
 	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
+	struct ssd130x_crtc_state *ssd130x_crtc_state =  to_ssd130x_crtc_state(crtc_state);
+	struct ssd130x_plane_state *ssd130x_plane_state = to_ssd130x_plane_state(plane_state);
+	struct drm_framebuffer *fb = plane_state->fb;
 	struct drm_atomic_helper_damage_iter iter;
 	struct drm_device *drm = plane->dev;
 	struct drm_rect dst_clip;
@@ -687,7 +693,9 @@  static void ssd130x_primary_plane_helper_atomic_update(struct drm_plane *plane,
 		if (!drm_rect_intersect(&dst_clip, &damage))
 			continue;
 
-		ssd130x_fb_blit_rect(plane_state, &shadow_plane_state->data[0], &dst_clip);
+		ssd130x_fb_blit_rect(fb, &shadow_plane_state->data[0], &dst_clip,
+				     ssd130x_plane_state->buffer,
+				     ssd130x_crtc_state->data_array);
 	}
 
 	drm_dev_exit(idx);
@@ -698,13 +706,21 @@  static void ssd130x_primary_plane_helper_atomic_disable(struct drm_plane *plane,
 {
 	struct drm_device *drm = plane->dev;
 	struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
-	struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane->state);
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc_state *crtc_state;
+	struct ssd130x_crtc_state *ssd130x_crtc_state;
 	int idx;
 
+	if (!plane_state->crtc)
+		return;
+
+	crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
+	ssd130x_crtc_state = to_ssd130x_crtc_state(crtc_state);
+
 	if (!drm_dev_enter(drm, &idx))
 		return;
 
-	ssd130x_clear_screen(ssd130x, ssd130x_state);
+	ssd130x_clear_screen(ssd130x, ssd130x_crtc_state->data_array);
 
 	drm_dev_exit(idx);
 }
@@ -737,9 +753,8 @@  static struct drm_plane_state *ssd130x_primary_plane_duplicate_state(struct drm_
 	if (!ssd130x_state)
 		return NULL;
 
-	/* The buffers are not duplicated and are allocated in .atomic_check */
+	/* The buffer is not duplicated and is allocated in .atomic_check */
 	ssd130x_state->buffer = NULL;
-	ssd130x_state->data_array = NULL;
 
 	new_shadow_plane_state = &ssd130x_state->base;
 
@@ -753,7 +768,6 @@  static void ssd130x_primary_plane_destroy_state(struct drm_plane *plane,
 {
 	struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(state);
 
-	kfree(ssd130x_state->data_array);
 	kfree(ssd130x_state->buffer);
 
 	__drm_gem_destroy_shadow_plane_state(&ssd130x_state->base);
@@ -793,6 +807,74 @@  static enum drm_mode_status ssd130x_crtc_helper_mode_valid(struct drm_crtc *crtc
 	return MODE_OK;
 }
 
+int ssd130x_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
+{
+	struct drm_device *drm = crtc->dev;
+	struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	struct ssd130x_crtc_state *ssd130x_state = to_ssd130x_crtc_state(crtc_state);
+	unsigned int page_height = ssd130x->device_info->page_height;
+	unsigned int pages = DIV_ROUND_UP(ssd130x->height, page_height);
+	int ret;
+
+	ret = drm_crtc_helper_atomic_check(crtc, state);
+	if (ret)
+		return ret;
+
+	ssd130x_state->data_array = kmalloc(ssd130x->width * pages, GFP_KERNEL);
+	if (!ssd130x_state->data_array)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/* Called during init to allocate the CRTC's atomic state. */
+static void ssd130x_crtc_reset(struct drm_crtc *crtc)
+{
+	struct ssd130x_crtc_state *ssd130x_state;
+
+	WARN_ON(crtc->state);
+
+	ssd130x_state = kzalloc(sizeof(*ssd130x_state), GFP_KERNEL);
+	if (!ssd130x_state)
+		return;
+
+	__drm_atomic_helper_crtc_reset(crtc, &ssd130x_state->base);
+}
+
+static struct drm_crtc_state *ssd130x_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	struct ssd130x_crtc_state *old_ssd130x_state;
+	struct ssd130x_crtc_state *ssd130x_state;
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	old_ssd130x_state = to_ssd130x_crtc_state(crtc->state);
+	ssd130x_state = kmemdup(old_ssd130x_state, sizeof(*ssd130x_state), GFP_KERNEL);
+	if (!ssd130x_state)
+		return NULL;
+
+	/* The buffer is not duplicated and is allocated in .atomic_check */
+	ssd130x_state->data_array = NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &ssd130x_state->base);
+
+	return &ssd130x_state->base;
+}
+
+static void ssd130x_crtc_destroy_state(struct drm_crtc *crtc,
+				       struct drm_crtc_state *state)
+{
+	struct ssd130x_crtc_state *ssd130x_state = to_ssd130x_crtc_state(state);
+
+	kfree(ssd130x_state->data_array);
+
+	__drm_atomic_helper_crtc_destroy_state(state);
+
+	kfree(ssd130x_state);
+}
+
 /*
  * The CRTC is always enabled. Screen updates are performed by
  * the primary plane's atomic_update function. Disabling clears
@@ -800,16 +882,16 @@  static enum drm_mode_status ssd130x_crtc_helper_mode_valid(struct drm_crtc *crtc
  */
 static const struct drm_crtc_helper_funcs ssd130x_crtc_helper_funcs = {
 	.mode_valid = ssd130x_crtc_helper_mode_valid,
-	.atomic_check = drm_crtc_helper_atomic_check,
+	.atomic_check = ssd130x_crtc_helper_atomic_check,
 };
 
 static const struct drm_crtc_funcs ssd130x_crtc_funcs = {
-	.reset = drm_atomic_helper_crtc_reset,
+	.reset = ssd130x_crtc_reset,
 	.destroy = drm_crtc_cleanup,
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
-	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	.atomic_duplicate_state = ssd130x_crtc_duplicate_state,
+	.atomic_destroy_state = ssd130x_crtc_destroy_state,
 };
 
 static void ssd130x_encoder_helper_atomic_enable(struct drm_encoder *encoder,