[PATCH v2 00/15] drm/bochs: cleanups, atomic modesetting, generic fbdev.

[PATCH v2 00/15] drm/bochs: cleanups, atomic modesetting, generic fbdev.

[Gerd Hoffmann]

This series adds support for atomic modesetting to the bochs driver.
It also switches over to the generic fbdev implementation and does
some cleanups.

v2:
 - some updates according to Oleksandr's review.
 - fix ttm bo pin/unpin  (new patch #15).

Gerd Hoffmann (15):
  drm/bochs: encoder cleanup
  drm/bochs: split bochs_hw_setmode
  drm/bochs: atomic: add atomic_flush+atomic_enable callbacks.
  drm/bochs: atomic: add mode_set_nofb callback.
  drm/bochs: atomic: switch planes to atomic, wire up helpers.
  drm/bochs: atomic: use atomic set_config helper
  drm/bochs: atomic: use atomic page_flip helper
  drm/bochs: atomic: set DRIVER_ATOMIC
  drm/bochs: remove old bochs_crtc_* functions
  drm/bochs: drop unused gpu_addr arg from bochs_bo_pin()
  drm/bochs: add basic prime support
  drm/bochs: switch to generic drm fbdev emulation
  drm/bochs: drop old fbdev emulation code
  drm/bochs: move remaining fb bits to kms
  drm/bochs: reserve bo for pin/unpin

 drivers/gpu/drm/bochs/bochs.h       |  27 +++--
 drivers/gpu/drm/bochs/bochs_drv.c   |  30 ++---
 drivers/gpu/drm/bochs/bochs_fbdev.c | 163 ---------------------------
 drivers/gpu/drm/bochs/bochs_hw.c    |  19 ++--
 drivers/gpu/drm/bochs/bochs_kms.c   | 218 +++++++++++++++++-------------------
 drivers/gpu/drm/bochs/bochs_mm.c    |  82 ++++++++++++--
 drivers/gpu/drm/bochs/Makefile      |   2 +-
 7 files changed, 218 insertions(+), 323 deletions(-)
 delete mode 100644 drivers/gpu/drm/bochs/bochs_fbdev.c

-- 
2.9.3

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[PATCH v2 01/15] drm/bochs: encoder cleanup

[Gerd Hoffmann]

Most unused callbacks can be NULL pointers these days.
Drop a bunch of empty encoder callbacks.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 26 --------------------------
 1 file changed, 26 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index f87c284dd9..c8ce54498d 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -170,31 +170,6 @@ static void bochs_crtc_init(struct drm_device *dev)
 	drm_crtc_helper_add(crtc, &bochs_helper_funcs);
 }
 
-static void bochs_encoder_mode_set(struct drm_encoder *encoder,
-				   struct drm_display_mode *mode,
-				   struct drm_display_mode *adjusted_mode)
-{
-}
-
-static void bochs_encoder_dpms(struct drm_encoder *encoder, int state)
-{
-}
-
-static void bochs_encoder_prepare(struct drm_encoder *encoder)
-{
-}
-
-static void bochs_encoder_commit(struct drm_encoder *encoder)
-{
-}
-
-static const struct drm_encoder_helper_funcs bochs_encoder_helper_funcs = {
-	.dpms = bochs_encoder_dpms,
-	.mode_set = bochs_encoder_mode_set,
-	.prepare = bochs_encoder_prepare,
-	.commit = bochs_encoder_commit,
-};
-
 static const struct drm_encoder_funcs bochs_encoder_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
@@ -207,7 +182,6 @@ static void bochs_encoder_init(struct drm_device *dev)
 	encoder->possible_crtcs = 0x1;
 	drm_encoder_init(dev, encoder, &bochs_encoder_encoder_funcs,
 			 DRM_MODE_ENCODER_DAC, NULL);
-	drm_encoder_helper_add(encoder, &bochs_encoder_helper_funcs);
 }
 
 
-- 
2.9.3

[PATCH v2 02/15] drm/bochs: split bochs_hw_setmode

[Gerd Hoffmann]

Create a separate bochs_hw_setformat function to configure
the framebuffer format (actually just the byteorder).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs.h     |  5 +++--
 drivers/gpu/drm/bochs/bochs_hw.c  | 19 ++++++++++++-------
 drivers/gpu/drm/bochs/bochs_kms.c |  3 ++-
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs.h b/drivers/gpu/drm/bochs/bochs.h
index fb38c8b857..4dc1b6384e 100644
--- a/drivers/gpu/drm/bochs/bochs.h
+++ b/drivers/gpu/drm/bochs/bochs.h
@@ -121,8 +121,9 @@ int bochs_hw_init(struct drm_device *dev);
 void bochs_hw_fini(struct drm_device *dev);
 
 void bochs_hw_setmode(struct bochs_device *bochs,
-		      struct drm_display_mode *mode,
-		      const struct drm_format_info *format);
+		      struct drm_display_mode *mode);
+void bochs_hw_setformat(struct bochs_device *bochs,
+			const struct drm_format_info *format);
 void bochs_hw_setbase(struct bochs_device *bochs,
 		      int x, int y, u64 addr);
 int bochs_hw_load_edid(struct bochs_device *bochs);
diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
index d0b4e1cee8..3e04b2f0ec 100644
--- a/drivers/gpu/drm/bochs/bochs_hw.c
+++ b/drivers/gpu/drm/bochs/bochs_hw.c
@@ -204,8 +204,7 @@ void bochs_hw_fini(struct drm_device *dev)
 }
 
 void bochs_hw_setmode(struct bochs_device *bochs,
-		      struct drm_display_mode *mode,
-		      const struct drm_format_info *format)
+		      struct drm_display_mode *mode)
 {
 	bochs->xres = mode->hdisplay;
 	bochs->yres = mode->vdisplay;
@@ -213,12 +212,8 @@ void bochs_hw_setmode(struct bochs_device *bochs,
 	bochs->stride = mode->hdisplay * (bochs->bpp / 8);
 	bochs->yres_virtual = bochs->fb_size / bochs->stride;
 
-	DRM_DEBUG_DRIVER("%dx%d @ %d bpp, format %c%c%c%c, vy %d\n",
+	DRM_DEBUG_DRIVER("%dx%d @ %d bpp, vy %d\n",
 			 bochs->xres, bochs->yres, bochs->bpp,
-			 (format->format >>  0) & 0xff,
-			 (format->format >>  8) & 0xff,
-			 (format->format >> 16) & 0xff,
-			 (format->format >> 24) & 0xff,
 			 bochs->yres_virtual);
 
 	bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
@@ -236,6 +231,16 @@ void bochs_hw_setmode(struct bochs_device *bochs,
 
 	bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,
 			  VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
+}
+
+void bochs_hw_setformat(struct bochs_device *bochs,
+			const struct drm_format_info *format)
+{
+	DRM_DEBUG_DRIVER("format %c%c%c%c\n",
+			 (format->format >>  0) & 0xff,
+			 (format->format >>  8) & 0xff,
+			 (format->format >> 16) & 0xff,
+			 (format->format >> 24) & 0xff);
 
 	switch (format->format) {
 	case DRM_FORMAT_XRGB8888:
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index c8ce54498d..f7e6d1a9b3 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -80,7 +80,8 @@ static int bochs_crtc_mode_set(struct drm_crtc *crtc,
 	if (WARN_ON(crtc->primary->fb == NULL))
 		return -EINVAL;
 
-	bochs_hw_setmode(bochs, mode, crtc->primary->fb->format);
+	bochs_hw_setmode(bochs, mode);
+	bochs_hw_setformat(bochs, crtc->primary->fb->format);
 	bochs_crtc_mode_set_base(crtc, x, y, old_fb);
 	return 0;
 }
-- 
2.9.3

[PATCH v2 03/15] drm/bochs: atomic: add atomic_flush+atomic_enable callbacks.

[Gerd Hoffmann]

Conversion to atomic modesetting, step one.
Add atomic crtc helper callbacks.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index f7e6d1a9b3..2cbd406b1f 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -115,6 +115,29 @@ static int bochs_crtc_page_flip(struct drm_crtc *crtc,
 	return 0;
 }
 
+static void bochs_crtc_atomic_enable(struct drm_crtc *crtc,
+				     struct drm_crtc_state *old_crtc_state)
+{
+}
+
+static void bochs_crtc_atomic_flush(struct drm_crtc *crtc,
+				    struct drm_crtc_state *old_crtc_state)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_pending_vblank_event *event;
+
+	if (crtc->state && crtc->state->event) {
+		unsigned long irqflags;
+
+		spin_lock_irqsave(&dev->event_lock, irqflags);
+		event = crtc->state->event;
+		crtc->state->event = NULL;
+		drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irqrestore(&dev->event_lock, irqflags);
+	}
+}
+
+
 /* These provide the minimum set of functions required to handle a CRTC */
 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 	.set_config = drm_crtc_helper_set_config,
@@ -128,6 +151,8 @@ static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 	.mode_set_base = bochs_crtc_mode_set_base,
 	.prepare = bochs_crtc_prepare,
 	.commit = bochs_crtc_commit,
+	.atomic_enable = bochs_crtc_atomic_enable,
+	.atomic_flush = bochs_crtc_atomic_flush,
 };
 
 static const uint32_t bochs_formats[] = {
-- 
2.9.3

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Re: [PATCH v2 03/15] drm/bochs: atomic: add atomic_flush+atomic_enable callbacks.

[Daniel Vetter]

On Tue, Jan 08, 2019 at 12:25:07PM +0100, Gerd Hoffmann wrote:
> Conversion to atomic modesetting, step one.
> Add atomic crtc helper callbacks.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  drivers/gpu/drm/bochs/bochs_kms.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
> index f7e6d1a9b3..2cbd406b1f 100644
> --- a/drivers/gpu/drm/bochs/bochs_kms.c
> +++ b/drivers/gpu/drm/bochs/bochs_kms.c
> @@ -115,6 +115,29 @@ static int bochs_crtc_page_flip(struct drm_crtc *crtc,
>  	return 0;
>  }
>  
> +static void bochs_crtc_atomic_enable(struct drm_crtc *crtc,
> +				     struct drm_crtc_state *old_crtc_state)
> +{
> +}

A patch to make this optional in the helpers would be neat.
-Daniel

> +
> +static void bochs_crtc_atomic_flush(struct drm_crtc *crtc,
> +				    struct drm_crtc_state *old_crtc_state)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct drm_pending_vblank_event *event;
> +
> +	if (crtc->state && crtc->state->event) {
> +		unsigned long irqflags;
> +
> +		spin_lock_irqsave(&dev->event_lock, irqflags);
> +		event = crtc->state->event;
> +		crtc->state->event = NULL;
> +		drm_crtc_send_vblank_event(crtc, event);
> +		spin_unlock_irqrestore(&dev->event_lock, irqflags);
> +	}
> +}
> +
> +
>  /* These provide the minimum set of functions required to handle a CRTC */
>  static const struct drm_crtc_funcs bochs_crtc_funcs = {
>  	.set_config = drm_crtc_helper_set_config,
> @@ -128,6 +151,8 @@ static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
>  	.mode_set_base = bochs_crtc_mode_set_base,
>  	.prepare = bochs_crtc_prepare,
>  	.commit = bochs_crtc_commit,
> +	.atomic_enable = bochs_crtc_atomic_enable,
> +	.atomic_flush = bochs_crtc_atomic_flush,
>  };
>  
>  static const uint32_t bochs_formats[] = {
> -- 
> 2.9.3
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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[PATCH v2 04/15] drm/bochs: atomic: add mode_set_nofb callback.

[Gerd Hoffmann]

Conversion to atomic modesetting, step two.
Add mode_set_nofb crtc helper callback.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 2cbd406b1f..56fd7be933 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -86,6 +86,14 @@ static int bochs_crtc_mode_set(struct drm_crtc *crtc,
 	return 0;
 }
 
+static void bochs_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct bochs_device *bochs =
+		container_of(crtc, struct bochs_device, crtc);
+
+	bochs_hw_setmode(bochs, &crtc->mode);
+}
+
 static void bochs_crtc_prepare(struct drm_crtc *crtc)
 {
 }
@@ -149,6 +157,7 @@ static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 	.dpms = bochs_crtc_dpms,
 	.mode_set = bochs_crtc_mode_set,
 	.mode_set_base = bochs_crtc_mode_set_base,
+	.mode_set_nofb = bochs_crtc_mode_set_nofb,
 	.prepare = bochs_crtc_prepare,
 	.commit = bochs_crtc_commit,
 	.atomic_enable = bochs_crtc_atomic_enable,
-- 
2.9.3

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[PATCH v2 05/15] drm/bochs: atomic: switch planes to atomic, wire up helpers.

[Gerd Hoffmann]

Conversion to atomic modesetting, step three.
Wire up atomic helpers.  Switch planes to atomic.

We are late to the party, the transitional helpers are gone,
so this can't be splitted into smaller steps any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_fbdev.c |  3 ++
 drivers/gpu/drm/bochs/bochs_kms.c   | 70 +++++++++++++++++++++++++++++++++++--
 2 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_fbdev.c b/drivers/gpu/drm/bochs/bochs_fbdev.c
index dd3c7df267..d9f3d42999 100644
--- a/drivers/gpu/drm/bochs/bochs_fbdev.c
+++ b/drivers/gpu/drm/bochs/bochs_fbdev.c
@@ -6,6 +6,7 @@
  */
 
 #include "bochs.h"
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 
 /* ---------------------------------------------------------------------- */
@@ -149,6 +150,8 @@ bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
 
 const struct drm_mode_config_funcs bochs_mode_funcs = {
 	.fb_create = bochs_gem_fb_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
 int bochs_fbdev_init(struct bochs_device *bochs)
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 56fd7be933..570f761ec4 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -6,7 +6,9 @@
  */
 
 #include "bochs.h"
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_atomic_uapi.h>
 
 static int defx = 1024;
 static int defy = 768;
@@ -113,7 +115,7 @@ static int bochs_crtc_page_flip(struct drm_crtc *crtc,
 	struct drm_framebuffer *old_fb = crtc->primary->fb;
 	unsigned long irqflags;
 
-	crtc->primary->fb = fb;
+	drm_atomic_set_fb_for_plane(crtc->primary->state, fb);
 	bochs_crtc_mode_set_base(crtc, 0, 0, old_fb);
 	if (event) {
 		spin_lock_irqsave(&bochs->dev->event_lock, irqflags);
@@ -151,6 +153,9 @@ static const struct drm_crtc_funcs bochs_crtc_funcs = {
 	.set_config = drm_crtc_helper_set_config,
 	.destroy = drm_crtc_cleanup,
 	.page_flip = bochs_crtc_page_flip,
+	.reset = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 };
 
 static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
@@ -169,6 +174,59 @@ static const uint32_t bochs_formats[] = {
 	DRM_FORMAT_BGRX8888,
 };
 
+static void bochs_plane_atomic_update(struct drm_plane *plane,
+				      struct drm_plane_state *old_state)
+{
+	struct bochs_device *bochs = plane->dev->dev_private;
+	struct bochs_bo *bo;
+
+	if (!plane->state->fb)
+		return;
+	bo = gem_to_bochs_bo(plane->state->fb->obj[0]);
+	bochs_hw_setbase(bochs,
+			 plane->state->crtc_x,
+			 plane->state->crtc_y,
+			 bo->bo.offset);
+	bochs_hw_setformat(bochs, plane->state->fb->format);
+}
+
+static int bochs_plane_prepare_fb(struct drm_plane *plane,
+				struct drm_plane_state *new_state)
+{
+	struct bochs_bo *bo;
+
+	if (!new_state->fb)
+		return 0;
+	bo = gem_to_bochs_bo(new_state->fb->obj[0]);
+	return bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
+}
+
+static void bochs_plane_cleanup_fb(struct drm_plane *plane,
+				   struct drm_plane_state *old_state)
+{
+	struct bochs_bo *bo;
+
+	if (!old_state->fb)
+		return;
+	bo = gem_to_bochs_bo(old_state->fb->obj[0]);
+	bochs_bo_unpin(bo);
+}
+
+static const struct drm_plane_helper_funcs bochs_plane_helper_funcs = {
+	.atomic_update = bochs_plane_atomic_update,
+	.prepare_fb = bochs_plane_prepare_fb,
+	.cleanup_fb = bochs_plane_cleanup_fb,
+};
+
+static const struct drm_plane_funcs bochs_plane_funcs = {
+       .update_plane   = drm_atomic_helper_update_plane,
+       .disable_plane  = drm_atomic_helper_disable_plane,
+       .destroy        = drm_primary_helper_destroy,
+       .reset          = drm_atomic_helper_plane_reset,
+       .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+       .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
 static struct drm_plane *bochs_primary_plane(struct drm_device *dev)
 {
 	struct drm_plane *primary;
@@ -181,16 +239,17 @@ static struct drm_plane *bochs_primary_plane(struct drm_device *dev)
 	}
 
 	ret = drm_universal_plane_init(dev, primary, 0,
-				       &drm_primary_helper_funcs,
+				       &bochs_plane_funcs,
 				       bochs_formats,
 				       ARRAY_SIZE(bochs_formats),
 				       NULL,
 				       DRM_PLANE_TYPE_PRIMARY, NULL);
 	if (ret) {
 		kfree(primary);
-		primary = NULL;
+		return NULL;
 	}
 
+	drm_plane_helper_add(primary, &bochs_plane_helper_funcs);
 	return primary;
 }
 
@@ -275,6 +334,9 @@ static const struct drm_connector_funcs bochs_connector_connector_funcs = {
 	.dpms = drm_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
 static void bochs_connector_init(struct drm_device *dev)
@@ -318,6 +380,8 @@ int bochs_kms_init(struct bochs_device *bochs)
 	drm_connector_attach_encoder(&bochs->connector,
 					  &bochs->encoder);
 
+	drm_mode_config_reset(bochs->dev);
+
 	return 0;
 }
 
-- 
2.9.3

[PATCH v2 06/15] drm/bochs: atomic: use atomic set_config helper

[Gerd Hoffmann]

Conversion to atomic modesetting, step four.
Use atomic set_config helper for crtc.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 570f761ec4..3c91ff652b 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -150,7 +150,7 @@ static void bochs_crtc_atomic_flush(struct drm_crtc *crtc,
 
 /* These provide the minimum set of functions required to handle a CRTC */
 static const struct drm_crtc_funcs bochs_crtc_funcs = {
-	.set_config = drm_crtc_helper_set_config,
+	.set_config = drm_atomic_helper_set_config,
 	.destroy = drm_crtc_cleanup,
 	.page_flip = bochs_crtc_page_flip,
 	.reset = drm_atomic_helper_crtc_reset,
-- 
2.9.3

[PATCH v2 07/15] drm/bochs: atomic: use atomic page_flip helper

[Gerd Hoffmann]

Conversion to atomic modesetting, step five.
Use atomic page_flip helper for crtc.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 3c91ff652b..f39e291245 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -104,27 +104,6 @@ static void bochs_crtc_commit(struct drm_crtc *crtc)
 {
 }
 
-static int bochs_crtc_page_flip(struct drm_crtc *crtc,
-				struct drm_framebuffer *fb,
-				struct drm_pending_vblank_event *event,
-				uint32_t page_flip_flags,
-				struct drm_modeset_acquire_ctx *ctx)
-{
-	struct bochs_device *bochs =
-		container_of(crtc, struct bochs_device, crtc);
-	struct drm_framebuffer *old_fb = crtc->primary->fb;
-	unsigned long irqflags;
-
-	drm_atomic_set_fb_for_plane(crtc->primary->state, fb);
-	bochs_crtc_mode_set_base(crtc, 0, 0, old_fb);
-	if (event) {
-		spin_lock_irqsave(&bochs->dev->event_lock, irqflags);
-		drm_crtc_send_vblank_event(crtc, event);
-		spin_unlock_irqrestore(&bochs->dev->event_lock, irqflags);
-	}
-	return 0;
-}
-
 static void bochs_crtc_atomic_enable(struct drm_crtc *crtc,
 				     struct drm_crtc_state *old_crtc_state)
 {
@@ -152,7 +131,7 @@ static void bochs_crtc_atomic_flush(struct drm_crtc *crtc,
 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.destroy = drm_crtc_cleanup,
-	.page_flip = bochs_crtc_page_flip,
+	.page_flip = drm_atomic_helper_page_flip,
 	.reset = drm_atomic_helper_crtc_reset,
 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
-- 
2.9.3

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[PATCH v2 08/15] drm/bochs: atomic: set DRIVER_ATOMIC

[Gerd Hoffmann]

Conversion to atomic modesetting, final step.
Set the DRIVER_ATOMIC flag.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index f3dd66ae99..278f9d2e7f 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -81,7 +81,7 @@ static const struct file_operations bochs_fops = {
 };
 
 static struct drm_driver bochs_driver = {
-	.driver_features	= DRIVER_GEM | DRIVER_MODESET,
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 	.fops			= &bochs_fops,
 	.name			= "bochs-drm",
 	.desc			= "bochs dispi vga interface (qemu stdvga)",
-- 
2.9.3

[PATCH v2 09/15] drm/bochs: remove old bochs_crtc_* functions

[Gerd Hoffmann]

Remove the old, now unused crtc callbacks.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 81 ---------------------------------------
 1 file changed, 81 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index f39e291245..85ada2d097 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -20,74 +20,6 @@ MODULE_PARM_DESC(defy, "default y resolution");
 
 /* ---------------------------------------------------------------------- */
 
-static void bochs_crtc_dpms(struct drm_crtc *crtc, int mode)
-{
-	switch (mode) {
-	case DRM_MODE_DPMS_ON:
-	case DRM_MODE_DPMS_STANDBY:
-	case DRM_MODE_DPMS_SUSPEND:
-	case DRM_MODE_DPMS_OFF:
-	default:
-		return;
-	}
-}
-
-static int bochs_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
-				    struct drm_framebuffer *old_fb)
-{
-	struct bochs_device *bochs =
-		container_of(crtc, struct bochs_device, crtc);
-	struct bochs_bo *bo;
-	u64 gpu_addr = 0;
-	int ret;
-
-	if (old_fb) {
-		bo = gem_to_bochs_bo(old_fb->obj[0]);
-		ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
-		if (ret) {
-			DRM_ERROR("failed to reserve old_fb bo\n");
-		} else {
-			bochs_bo_unpin(bo);
-			ttm_bo_unreserve(&bo->bo);
-		}
-	}
-
-	if (WARN_ON(crtc->primary->fb == NULL))
-		return -EINVAL;
-
-	bo = gem_to_bochs_bo(crtc->primary->fb->obj[0]);
-	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
-	if (ret)
-		return ret;
-
-	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
-	if (ret) {
-		ttm_bo_unreserve(&bo->bo);
-		return ret;
-	}
-
-	ttm_bo_unreserve(&bo->bo);
-	bochs_hw_setbase(bochs, x, y, gpu_addr);
-	return 0;
-}
-
-static int bochs_crtc_mode_set(struct drm_crtc *crtc,
-			       struct drm_display_mode *mode,
-			       struct drm_display_mode *adjusted_mode,
-			       int x, int y, struct drm_framebuffer *old_fb)
-{
-	struct bochs_device *bochs =
-		container_of(crtc, struct bochs_device, crtc);
-
-	if (WARN_ON(crtc->primary->fb == NULL))
-		return -EINVAL;
-
-	bochs_hw_setmode(bochs, mode);
-	bochs_hw_setformat(bochs, crtc->primary->fb->format);
-	bochs_crtc_mode_set_base(crtc, x, y, old_fb);
-	return 0;
-}
-
 static void bochs_crtc_mode_set_nofb(struct drm_crtc *crtc)
 {
 	struct bochs_device *bochs =
@@ -96,14 +28,6 @@ static void bochs_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	bochs_hw_setmode(bochs, &crtc->mode);
 }
 
-static void bochs_crtc_prepare(struct drm_crtc *crtc)
-{
-}
-
-static void bochs_crtc_commit(struct drm_crtc *crtc)
-{
-}
-
 static void bochs_crtc_atomic_enable(struct drm_crtc *crtc,
 				     struct drm_crtc_state *old_crtc_state)
 {
@@ -138,12 +62,7 @@ static const struct drm_crtc_funcs bochs_crtc_funcs = {
 };
 
 static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
-	.dpms = bochs_crtc_dpms,
-	.mode_set = bochs_crtc_mode_set,
-	.mode_set_base = bochs_crtc_mode_set_base,
 	.mode_set_nofb = bochs_crtc_mode_set_nofb,
-	.prepare = bochs_crtc_prepare,
-	.commit = bochs_crtc_commit,
 	.atomic_enable = bochs_crtc_atomic_enable,
 	.atomic_flush = bochs_crtc_atomic_flush,
 };
-- 
2.9.3

[PATCH v2 10/15] drm/bochs: drop unused gpu_addr arg from bochs_bo_pin()

[Gerd Hoffmann]

It's always NULL, so just remove it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs.h       |  2 +-
 drivers/gpu/drm/bochs/bochs_fbdev.c |  2 +-
 drivers/gpu/drm/bochs/bochs_kms.c   |  2 +-
 drivers/gpu/drm/bochs/bochs_mm.c    | 11 +----------
 4 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs.h b/drivers/gpu/drm/bochs/bochs.h
index 4dc1b6384e..d0d474e06f 100644
--- a/drivers/gpu/drm/bochs/bochs.h
+++ b/drivers/gpu/drm/bochs/bochs.h
@@ -142,7 +142,7 @@ int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 			   uint32_t handle, uint64_t *offset);
 
-int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr);
+int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag);
 int bochs_bo_unpin(struct bochs_bo *bo);
 
 /* bochs_kms.c */
diff --git a/drivers/gpu/drm/bochs/bochs_fbdev.c b/drivers/gpu/drm/bochs/bochs_fbdev.c
index d9f3d42999..92feb817ff 100644
--- a/drivers/gpu/drm/bochs/bochs_fbdev.c
+++ b/drivers/gpu/drm/bochs/bochs_fbdev.c
@@ -81,7 +81,7 @@ static int bochsfb_create(struct drm_fb_helper *helper,
 	if (ret)
 		return ret;
 
-	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
+	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
 	if (ret) {
 		DRM_ERROR("failed to pin fbcon\n");
 		ttm_bo_unreserve(&bo->bo);
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 85ada2d097..fc856a02a2 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -96,7 +96,7 @@ static int bochs_plane_prepare_fb(struct drm_plane *plane,
 	if (!new_state->fb)
 		return 0;
 	bo = gem_to_bochs_bo(new_state->fb->obj[0]);
-	return bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
+	return bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
 }
 
 static void bochs_plane_cleanup_fb(struct drm_plane *plane,
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 0980411e41..5a0e092847 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -210,20 +210,13 @@ static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
 	bo->placement.num_busy_placement = c;
 }
 
-static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
-{
-	return bo->bo.offset;
-}
-
-int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
+int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag)
 {
 	struct ttm_operation_ctx ctx = { false, false };
 	int i, ret;
 
 	if (bo->pin_count) {
 		bo->pin_count++;
-		if (gpu_addr)
-			*gpu_addr = bochs_bo_gpu_offset(bo);
 		return 0;
 	}
 
@@ -235,8 +228,6 @@ int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
 		return ret;
 
 	bo->pin_count = 1;
-	if (gpu_addr)
-		*gpu_addr = bochs_bo_gpu_offset(bo);
 	return 0;
 }
 
-- 
2.9.3

[PATCH v2 11/15] drm/bochs: add basic prime support

[Gerd Hoffmann]

Generic framebuffer emulation needs this.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs.h     | 11 +++++++
 drivers/gpu/drm/bochs/bochs_drv.c | 15 +++++++++-
 drivers/gpu/drm/bochs/bochs_mm.c  | 63 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bochs/bochs.h b/drivers/gpu/drm/bochs/bochs.h
index d0d474e06f..df9ff6425d 100644
--- a/drivers/gpu/drm/bochs/bochs.h
+++ b/drivers/gpu/drm/bochs/bochs.h
@@ -145,6 +145,17 @@ int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag);
 int bochs_bo_unpin(struct bochs_bo *bo);
 
+int bochs_gem_prime_pin(struct drm_gem_object *obj);
+void bochs_gem_prime_unpin(struct drm_gem_object *obj);
+struct sg_table *bochs_gem_prime_get_sg_table(struct drm_gem_object *obj);
+struct drm_gem_object *bochs_gem_prime_import_sg_table(
+	struct drm_device *dev, struct dma_buf_attachment *attach,
+	struct sg_table *sgt);
+void *bochs_gem_prime_vmap(struct drm_gem_object *obj);
+void bochs_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
+int bochs_gem_prime_mmap(struct drm_gem_object *obj,
+			 struct vm_area_struct *vma);
+
 /* bochs_kms.c */
 int bochs_kms_init(struct bochs_device *bochs);
 void bochs_kms_fini(struct bochs_device *bochs);
diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index 278f9d2e7f..a9c7140e3b 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -81,7 +81,8 @@ static const struct file_operations bochs_fops = {
 };
 
 static struct drm_driver bochs_driver = {
-	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
+				  DRIVER_PRIME,
 	.fops			= &bochs_fops,
 	.name			= "bochs-drm",
 	.desc			= "bochs dispi vga interface (qemu stdvga)",
@@ -91,6 +92,18 @@ static struct drm_driver bochs_driver = {
 	.gem_free_object_unlocked = bochs_gem_free_object,
 	.dumb_create            = bochs_dumb_create,
 	.dumb_map_offset        = bochs_dumb_mmap_offset,
+
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_pin = bochs_gem_prime_pin,
+	.gem_prime_unpin = bochs_gem_prime_unpin,
+	.gem_prime_get_sg_table = bochs_gem_prime_get_sg_table,
+	.gem_prime_import_sg_table = bochs_gem_prime_import_sg_table,
+	.gem_prime_vmap = bochs_gem_prime_vmap,
+	.gem_prime_vunmap = bochs_gem_prime_vunmap,
+	.gem_prime_mmap = bochs_gem_prime_mmap,
 };
 
 /* ---------------------------------------------------------------------- */
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 5a0e092847..cfe061c25f 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -387,3 +387,66 @@ int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 	drm_gem_object_put_unlocked(obj);
 	return 0;
 }
+
+/* ---------------------------------------------------------------------- */
+
+int bochs_gem_prime_pin(struct drm_gem_object *obj)
+{
+	struct bochs_bo *bo = gem_to_bochs_bo(obj);
+
+	return bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
+}
+
+void bochs_gem_prime_unpin(struct drm_gem_object *obj)
+{
+	struct bochs_bo *bo = gem_to_bochs_bo(obj);
+
+	bochs_bo_unpin(bo);
+}
+
+struct sg_table *bochs_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+	WARN_ONCE(1, "not implemented");
+	return ERR_PTR(-ENODEV);
+}
+
+struct drm_gem_object *bochs_gem_prime_import_sg_table(
+	struct drm_device *dev, struct dma_buf_attachment *attach,
+	struct sg_table *table)
+{
+	WARN_ONCE(1, "not implemented");
+	return ERR_PTR(-ENODEV);
+}
+
+void *bochs_gem_prime_vmap(struct drm_gem_object *obj)
+{
+	struct bochs_bo *bo = gem_to_bochs_bo(obj);
+	bool is_iomem;
+	int ret;
+
+	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
+	if (ret)
+		return NULL;
+	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
+	if (ret) {
+		bochs_bo_unpin(bo);
+		return NULL;
+	}
+	return ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
+}
+
+void bochs_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+	struct bochs_bo *bo = gem_to_bochs_bo(obj);
+
+	ttm_bo_kunmap(&bo->kmap);
+	bochs_bo_unpin(bo);
+}
+
+int bochs_gem_prime_mmap(struct drm_gem_object *obj,
+			 struct vm_area_struct *vma)
+{
+	struct bochs_bo *bo = gem_to_bochs_bo(obj);
+
+	return ttm_fbdev_mmap(vma, &bo->bo);
+}
-- 
2.9.3

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[PATCH v2 12/15] drm/bochs: switch to generic drm fbdev emulation

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/bochs/bochs_drv.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index a9c7140e3b..350e34cf2c 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -16,10 +16,6 @@ static int bochs_modeset = -1;
 module_param_named(modeset, bochs_modeset, int, 0444);
 MODULE_PARM_DESC(modeset, "enable/disable kernel modesetting");
 
-static bool enable_fbdev = true;
-module_param_named(fbdev, enable_fbdev, bool, 0444);
-MODULE_PARM_DESC(fbdev, "register fbdev device");
-
 /* ---------------------------------------------------------------------- */
 /* drm interface                                                          */
 
@@ -27,7 +23,6 @@ static void bochs_unload(struct drm_device *dev)
 {
 	struct bochs_device *bochs = dev->dev_private;
 
-	bochs_fbdev_fini(bochs);
 	bochs_kms_fini(bochs);
 	bochs_mm_fini(bochs);
 	bochs_hw_fini(dev);
@@ -58,9 +53,6 @@ static int bochs_load(struct drm_device *dev)
 	if (ret)
 		goto err;
 
-	if (enable_fbdev)
-		bochs_fbdev_init(bochs);
-
 	return 0;
 
 err:
@@ -178,6 +170,7 @@ static int bochs_pci_probe(struct pci_dev *pdev,
 	if (ret)
 		goto err_unload;
 
+	drm_fbdev_generic_setup(dev, 32);
 	return ret;
 
 err_unload:
-- 
2.9.3

[PATCH v2 13/15] drm/bochs: drop old fbdev emulation code

[Gerd Hoffmann]

Not needed any more, bochs uses the generic emulation now.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs.h       |   9 ---
 drivers/gpu/drm/bochs/bochs_drv.c   |   6 --
 drivers/gpu/drm/bochs/bochs_fbdev.c | 137 ------------------------------------
 3 files changed, 152 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs.h b/drivers/gpu/drm/bochs/bochs.h
index df9ff6425d..1ecabd2b78 100644
--- a/drivers/gpu/drm/bochs/bochs.h
+++ b/drivers/gpu/drm/bochs/bochs.h
@@ -80,12 +80,6 @@ struct bochs_device {
 		struct ttm_bo_device bdev;
 		bool initialized;
 	} ttm;
-
-	/* fbdev */
-	struct {
-		struct drm_framebuffer *fb;
-		struct drm_fb_helper helper;
-	} fb;
 };
 
 struct bochs_bo {
@@ -161,7 +155,4 @@ int bochs_kms_init(struct bochs_device *bochs);
 void bochs_kms_fini(struct bochs_device *bochs);
 
 /* bochs_fbdev.c */
-int bochs_fbdev_init(struct bochs_device *bochs);
-void bochs_fbdev_fini(struct bochs_device *bochs);
-
 extern const struct drm_mode_config_funcs bochs_mode_funcs;
diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index 350e34cf2c..4f78e42686 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -106,12 +106,9 @@ static int bochs_pm_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	struct bochs_device *bochs = drm_dev->dev_private;
 
 	drm_kms_helper_poll_disable(drm_dev);
 
-	drm_fb_helper_set_suspend_unlocked(&bochs->fb.helper, 1);
-
 	return 0;
 }
 
@@ -119,12 +116,9 @@ static int bochs_pm_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	struct bochs_device *bochs = drm_dev->dev_private;
 
 	drm_helper_resume_force_mode(drm_dev);
 
-	drm_fb_helper_set_suspend_unlocked(&bochs->fb.helper, 0);
-
 	drm_kms_helper_poll_enable(drm_dev);
 	return 0;
 }
diff --git a/drivers/gpu/drm/bochs/bochs_fbdev.c b/drivers/gpu/drm/bochs/bochs_fbdev.c
index 92feb817ff..7cac3f5253 100644
--- a/drivers/gpu/drm/bochs/bochs_fbdev.c
+++ b/drivers/gpu/drm/bochs/bochs_fbdev.c
@@ -11,132 +11,6 @@
 
 /* ---------------------------------------------------------------------- */
 
-static int bochsfb_mmap(struct fb_info *info,
-			struct vm_area_struct *vma)
-{
-	struct drm_fb_helper *fb_helper = info->par;
-	struct bochs_bo *bo = gem_to_bochs_bo(fb_helper->fb->obj[0]);
-
-	return ttm_fbdev_mmap(vma, &bo->bo);
-}
-
-static struct fb_ops bochsfb_ops = {
-	.owner = THIS_MODULE,
-	DRM_FB_HELPER_DEFAULT_OPS,
-	.fb_fillrect = drm_fb_helper_cfb_fillrect,
-	.fb_copyarea = drm_fb_helper_cfb_copyarea,
-	.fb_imageblit = drm_fb_helper_cfb_imageblit,
-	.fb_mmap = bochsfb_mmap,
-};
-
-static int bochsfb_create_object(struct bochs_device *bochs,
-				 const struct drm_mode_fb_cmd2 *mode_cmd,
-				 struct drm_gem_object **gobj_p)
-{
-	struct drm_device *dev = bochs->dev;
-	struct drm_gem_object *gobj;
-	u32 size;
-	int ret = 0;
-
-	size = mode_cmd->pitches[0] * mode_cmd->height;
-	ret = bochs_gem_create(dev, size, true, &gobj);
-	if (ret)
-		return ret;
-
-	*gobj_p = gobj;
-	return ret;
-}
-
-static int bochsfb_create(struct drm_fb_helper *helper,
-			  struct drm_fb_helper_surface_size *sizes)
-{
-	struct bochs_device *bochs =
-		container_of(helper, struct bochs_device, fb.helper);
-	struct fb_info *info;
-	struct drm_framebuffer *fb;
-	struct drm_mode_fb_cmd2 mode_cmd;
-	struct drm_gem_object *gobj = NULL;
-	struct bochs_bo *bo = NULL;
-	int size, ret;
-
-	if (sizes->surface_bpp != 32)
-		return -EINVAL;
-
-	mode_cmd.width = sizes->surface_width;
-	mode_cmd.height = sizes->surface_height;
-	mode_cmd.pitches[0] = sizes->surface_width * 4;
-	mode_cmd.pixel_format = DRM_FORMAT_HOST_XRGB8888;
-	size = mode_cmd.pitches[0] * mode_cmd.height;
-
-	/* alloc, pin & map bo */
-	ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
-	if (ret) {
-		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
-		return ret;
-	}
-
-	bo = gem_to_bochs_bo(gobj);
-
-	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
-	if (ret)
-		return ret;
-
-	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
-	if (ret) {
-		DRM_ERROR("failed to pin fbcon\n");
-		ttm_bo_unreserve(&bo->bo);
-		return ret;
-	}
-
-	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
-			  &bo->kmap);
-	if (ret) {
-		DRM_ERROR("failed to kmap fbcon\n");
-		ttm_bo_unreserve(&bo->bo);
-		return ret;
-	}
-
-	ttm_bo_unreserve(&bo->bo);
-
-	/* init fb device */
-	info = drm_fb_helper_alloc_fbi(helper);
-	if (IS_ERR(info)) {
-		DRM_ERROR("Failed to allocate fbi: %ld\n", PTR_ERR(info));
-		return PTR_ERR(info);
-	}
-
-	info->par = &bochs->fb.helper;
-
-	fb = drm_gem_fbdev_fb_create(bochs->dev, sizes, 0, gobj, NULL);
-	if (IS_ERR(fb)) {
-		DRM_ERROR("Failed to create framebuffer: %ld\n", PTR_ERR(fb));
-		return PTR_ERR(fb);
-	}
-
-	/* setup helper */
-	bochs->fb.helper.fb = fb;
-
-	strcpy(info->fix.id, "bochsdrmfb");
-
-	info->fbops = &bochsfb_ops;
-
-	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
-	drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
-			       sizes->fb_height);
-
-	info->screen_base = bo->kmap.virtual;
-	info->screen_size = size;
-
-	drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
-	info->fix.smem_start = 0;
-	info->fix.smem_len = size;
-	return 0;
-}
-
-static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
-	.fb_probe = bochsfb_create,
-};
-
 static struct drm_framebuffer *
 bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
 		    const struct drm_mode_fb_cmd2 *mode_cmd)
@@ -153,14 +27,3 @@ const struct drm_mode_config_funcs bochs_mode_funcs = {
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };
-
-int bochs_fbdev_init(struct bochs_device *bochs)
-{
-	return drm_fb_helper_fbdev_setup(bochs->dev, &bochs->fb.helper,
-					 &bochs_fb_helper_funcs, 32, 1);
-}
-
-void bochs_fbdev_fini(struct bochs_device *bochs)
-{
-	drm_fb_helper_fbdev_teardown(bochs->dev);
-}
-- 
2.9.3

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[PATCH v2 14/15] drm/bochs: move remaining fb bits to kms

[Gerd Hoffmann]

bochs_fbdev.c is almost empty now.  Move the remaining framebuffer bits
over to bochs_kms.c.  Pure code motion. No functional change.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 drivers/gpu/drm/bochs/bochs_fbdev.c | 29 -----------------------------
 drivers/gpu/drm/bochs/bochs_kms.c   | 17 +++++++++++++++++
 drivers/gpu/drm/bochs/Makefile      |  2 +-
 3 files changed, 18 insertions(+), 30 deletions(-)
 delete mode 100644 drivers/gpu/drm/bochs/bochs_fbdev.c

diff --git a/drivers/gpu/drm/bochs/bochs_fbdev.c b/drivers/gpu/drm/bochs/bochs_fbdev.c
deleted file mode 100644
index 7cac3f5253..0000000000
--- a/drivers/gpu/drm/bochs/bochs_fbdev.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include "bochs.h"
-#include <drm/drm_atomic_helper.h>
-#include <drm/drm_gem_framebuffer_helper.h>
-
-/* ---------------------------------------------------------------------- */
-
-static struct drm_framebuffer *
-bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
-		    const struct drm_mode_fb_cmd2 *mode_cmd)
-{
-	if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888 &&
-	    mode_cmd->pixel_format != DRM_FORMAT_BGRX8888)
-		return ERR_PTR(-EINVAL);
-
-	return drm_gem_fb_create(dev, file, mode_cmd);
-}
-
-const struct drm_mode_config_funcs bochs_mode_funcs = {
-	.fb_create = bochs_gem_fb_create,
-	.atomic_check = drm_atomic_helper_check,
-	.atomic_commit = drm_atomic_helper_commit,
-};
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index fc856a02a2..e9d5dbc346 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -9,6 +9,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_atomic_uapi.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 
 static int defx = 1024;
 static int defy = 768;
@@ -256,6 +257,22 @@ static void bochs_connector_init(struct drm_device *dev)
 	}
 }
 
+static struct drm_framebuffer *
+bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
+		    const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888 &&
+	    mode_cmd->pixel_format != DRM_FORMAT_BGRX8888)
+		return ERR_PTR(-EINVAL);
+
+	return drm_gem_fb_create(dev, file, mode_cmd);
+}
+
+const struct drm_mode_config_funcs bochs_mode_funcs = {
+	.fb_create = bochs_gem_fb_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
 
 int bochs_kms_init(struct bochs_device *bochs)
 {
diff --git a/drivers/gpu/drm/bochs/Makefile b/drivers/gpu/drm/bochs/Makefile
index 98ef60a19e..e9e0f8f5eb 100644
--- a/drivers/gpu/drm/bochs/Makefile
+++ b/drivers/gpu/drm/bochs/Makefile
@@ -1,3 +1,3 @@
-bochs-drm-y := bochs_drv.o bochs_mm.o bochs_kms.o bochs_fbdev.o bochs_hw.o
+bochs-drm-y := bochs_drv.o bochs_mm.o bochs_kms.o bochs_hw.o
 
 obj-$(CONFIG_DRM_BOCHS)	+= bochs-drm.o
-- 
2.9.3

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[PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Gerd Hoffmann]

The buffer object must be reserved before calling
ttm_bo_validate for pinning/unpinning.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/bochs/bochs_mm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index cfe061c25f..970a591908 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -223,7 +223,11 @@ int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag)
 	bochs_ttm_placement(bo, pl_flag);
 	for (i = 0; i < bo->placement.num_placement; i++)
 		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
+	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
+	if (ret)
+		return ret;
 	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
+	ttm_bo_unreserve(&bo->bo);
 	if (ret)
 		return ret;
 
@@ -247,7 +251,11 @@ int bochs_bo_unpin(struct bochs_bo *bo)
 
 	for (i = 0; i < bo->placement.num_placement; i++)
 		bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
+	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
+	if (ret)
+		return ret;
 	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
+	ttm_bo_unreserve(&bo->bo);
 	if (ret)
 		return ret;
 
-- 
2.9.3

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Re: [PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Daniel Vetter]

On Tue, Jan 08, 2019 at 12:25:19PM +0100, Gerd Hoffmann wrote:
> The buffer object must be reserved before calling
> ttm_bo_validate for pinning/unpinning.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Seems a bit a bisect fumble in your series here: legacy kms code reserved
the ttm bo before calling boch_bo_pin/unpin, your atomic code doesn't. I
think pushing this into bochs_bo_pin/unpin makes sense for atomic, but to
avoid bisect fail I think you need to have these temporarily in your
cleanup/prepare_plane functions too.

Looked through the entire series, this here is the only issue I think
should be fixed before merging (making atomic_enable optional can be done
as a follow-up if you feel like it). With that addressed on the series:

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  drivers/gpu/drm/bochs/bochs_mm.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
> index cfe061c25f..970a591908 100644
> --- a/drivers/gpu/drm/bochs/bochs_mm.c
> +++ b/drivers/gpu/drm/bochs/bochs_mm.c
> @@ -223,7 +223,11 @@ int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag)
>  	bochs_ttm_placement(bo, pl_flag);
>  	for (i = 0; i < bo->placement.num_placement; i++)
>  		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
> +	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
> +	if (ret)
> +		return ret;
>  	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
> +	ttm_bo_unreserve(&bo->bo);
>  	if (ret)
>  		return ret;
>  
> @@ -247,7 +251,11 @@ int bochs_bo_unpin(struct bochs_bo *bo)
>  
>  	for (i = 0; i < bo->placement.num_placement; i++)
>  		bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
> +	ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
> +	if (ret)
> +		return ret;
>  	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
> +	ttm_bo_unreserve(&bo->bo);
>  	if (ret)
>  		return ret;
>  
> -- 
> 2.9.3
> 
> _______________________________________________
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> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
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Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Gerd Hoffmann]

On Wed, Jan 09, 2019 at 11:10:44AM +0100, Daniel Vetter wrote:
> On Tue, Jan 08, 2019 at 12:25:19PM +0100, Gerd Hoffmann wrote:
> > The buffer object must be reserved before calling
> > ttm_bo_validate for pinning/unpinning.
> > 
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> 
> Seems a bit a bisect fumble in your series here: legacy kms code reserved
> the ttm bo before calling boch_bo_pin/unpin, your atomic code doesn't. I
> think pushing this into bochs_bo_pin/unpin makes sense for atomic, but to
> avoid bisect fail I think you need to have these temporarily in your
> cleanup/prepare_plane functions too.

I think I've sorted that.  Have some other changes too, will probably
send v3 tomorrow.

> Looked through the entire series, this here is the only issue I think
> should be fixed before merging (making atomic_enable optional can be done
> as a follow-up if you feel like it). With that addressed on the series:
> 
> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Thanks.

While being at it:  I'm also looking at dma-buf export and import
support for the qemu drivers.

Right now both qxl and virtio have gem_prime_get_sg_table and
gem_prime_import_sg_table handlers which throw a WARN_ONCE() and return
an error.

If I understand things correctly it is valid to set all import/export
callbacks (prime_handle_to_fd, prime_fd_to_handle,
gem_prime_get_sg_table, gem_prime_import_sg_table) to NULL when not
supporting dma-buf import/export and still advertise DRIVER_PRIME to
indicate the other prime callbacks are supported (so generic fbdev
emulation can use gem_prime_vmap etc).  Is that correct?

On exporting:

TTM_PL_TT should be easy, just pin the buffer, grab the pages list and
feed that into drm_prime_pages_to_sg.  Didn't try yet though.  Is that
approach correct?

Is it possible to export TTM_PL_VRAM objects (with backing storage being
a pci memory bar)?  If so, how?

On importing:

Importing into TTM_PL_TT object looks easy again, at least when the
object is actually stored in RAM.  What if not?

Importing into TTM_PL_VRAM:  Impossible I think, without copying over
the data.  Should that be done?  If so, how?  Or is it better to just
not support import then?

thanks,
  Gerd

Re: [PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Daniel Vetter]

On Wed, Jan 9, 2019 at 3:54 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> On Wed, Jan 09, 2019 at 11:10:44AM +0100, Daniel Vetter wrote:
> > On Tue, Jan 08, 2019 at 12:25:19PM +0100, Gerd Hoffmann wrote:
> > > The buffer object must be reserved before calling
> > > ttm_bo_validate for pinning/unpinning.
> > >
> > > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> >
> > Seems a bit a bisect fumble in your series here: legacy kms code reserved
> > the ttm bo before calling boch_bo_pin/unpin, your atomic code doesn't. I
> > think pushing this into bochs_bo_pin/unpin makes sense for atomic, but to
> > avoid bisect fail I think you need to have these temporarily in your
> > cleanup/prepare_plane functions too.
>
> I think I've sorted that.  Have some other changes too, will probably
> send v3 tomorrow.
>
> > Looked through the entire series, this here is the only issue I think
> > should be fixed before merging (making atomic_enable optional can be done
> > as a follow-up if you feel like it). With that addressed on the series:
> >
> > Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
> Thanks.
>
> While being at it:  I'm also looking at dma-buf export and import
> support for the qemu drivers.
>
> Right now both qxl and virtio have gem_prime_get_sg_table and
> gem_prime_import_sg_table handlers which throw a WARN_ONCE() and return
> an error.
>
> If I understand things correctly it is valid to set all import/export
> callbacks (prime_handle_to_fd, prime_fd_to_handle,
> gem_prime_get_sg_table, gem_prime_import_sg_table) to NULL when not
> supporting dma-buf import/export and still advertise DRIVER_PRIME to
> indicate the other prime callbacks are supported (so generic fbdev
> emulation can use gem_prime_vmap etc).  Is that correct?

I'm not sure how much that's a good idea ... Never thought about it
tbh. All the fbdev/dma-buf stuff has plenty of hacks and
inconsistencies still, so I guess we can't make it much worse really.

> On exporting:
>
> TTM_PL_TT should be easy, just pin the buffer, grab the pages list and
> feed that into drm_prime_pages_to_sg.  Didn't try yet though.  Is that
> approach correct?
>
> Is it possible to export TTM_PL_VRAM objects (with backing storage being
> a pci memory bar)?  If so, how?

Not really in general. amdgpu upcasts to amdgpu_bo (if it's amgpu BO)
and then knows the internals so it can do a proper pci peer2peer
mapping. Or at least there's been lots of patches floating around to
make that happen.

I think other drivers migrate the bo out of VRAM.

> On importing:
>
> Importing into TTM_PL_TT object looks easy again, at least when the
> object is actually stored in RAM.  What if not?

They are all supposed to be stored in RAM. Note that all current ttm
importers totally break the abstraction, by taking the sg list,
throwing the dma mapping away and assuming there's a struct page
backing it. Would be good if we could stop spreading that abuse - the
dma-buf interfaces have been modelled after the ttm bo interfaces, so
shouldn't be too hard to wire this up correctly.

> Importing into TTM_PL_VRAM:  Impossible I think, without copying over
> the data.  Should that be done?  If so, how?  Or is it better to just
> not support import then?

Hm, since you ask about TTM concepts and not what this means in terms
of dma-buf: As long as you upcast to the ttm_bo you can do whatever
you want to really. But with plain dma-buf this doesn't work right now
(least because ttm assumes it gets system RAM on import, in theory you
could put the peer2peer dma mapping into the sg list and it should
work).
-Daniel

>
> thanks,
>   Gerd
>
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> https://lists.freedesktop.org/mailman/listinfo/dri-devel



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+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Alex Deucher]

On Wed, Jan 9, 2019 at 12:36 PM Daniel Vetter <daniel@ffwll.ch> wrote:
>
> On Wed, Jan 9, 2019 at 3:54 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
> >
> > On Wed, Jan 09, 2019 at 11:10:44AM +0100, Daniel Vetter wrote:
> > > On Tue, Jan 08, 2019 at 12:25:19PM +0100, Gerd Hoffmann wrote:
> > > > The buffer object must be reserved before calling
> > > > ttm_bo_validate for pinning/unpinning.
> > > >
> > > > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> > >
> > > Seems a bit a bisect fumble in your series here: legacy kms code reserved
> > > the ttm bo before calling boch_bo_pin/unpin, your atomic code doesn't. I
> > > think pushing this into bochs_bo_pin/unpin makes sense for atomic, but to
> > > avoid bisect fail I think you need to have these temporarily in your
> > > cleanup/prepare_plane functions too.
> >
> > I think I've sorted that.  Have some other changes too, will probably
> > send v3 tomorrow.
> >
> > > Looked through the entire series, this here is the only issue I think
> > > should be fixed before merging (making atomic_enable optional can be done
> > > as a follow-up if you feel like it). With that addressed on the series:
> > >
> > > Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> >
> > Thanks.
> >
> > While being at it:  I'm also looking at dma-buf export and import
> > support for the qemu drivers.
> >
> > Right now both qxl and virtio have gem_prime_get_sg_table and
> > gem_prime_import_sg_table handlers which throw a WARN_ONCE() and return
> > an error.
> >
> > If I understand things correctly it is valid to set all import/export
> > callbacks (prime_handle_to_fd, prime_fd_to_handle,
> > gem_prime_get_sg_table, gem_prime_import_sg_table) to NULL when not
> > supporting dma-buf import/export and still advertise DRIVER_PRIME to
> > indicate the other prime callbacks are supported (so generic fbdev
> > emulation can use gem_prime_vmap etc).  Is that correct?
>
> I'm not sure how much that's a good idea ... Never thought about it
> tbh. All the fbdev/dma-buf stuff has plenty of hacks and
> inconsistencies still, so I guess we can't make it much worse really.
>
> > On exporting:
> >
> > TTM_PL_TT should be easy, just pin the buffer, grab the pages list and
> > feed that into drm_prime_pages_to_sg.  Didn't try yet though.  Is that
> > approach correct?
> >
> > Is it possible to export TTM_PL_VRAM objects (with backing storage being
> > a pci memory bar)?  If so, how?
>
> Not really in general. amdgpu upcasts to amdgpu_bo (if it's amgpu BO)
> and then knows the internals so it can do a proper pci peer2peer
> mapping. Or at least there's been lots of patches floating around to
> make that happen.

Here's Christian's WIP stuff for adding device memory support to dma-buf:
https://cgit.freedesktop.org/~deathsimple/linux/log/?h=p2p

Alex

>
> I think other drivers migrate the bo out of VRAM.
>
> > On importing:
> >
> > Importing into TTM_PL_TT object looks easy again, at least when the
> > object is actually stored in RAM.  What if not?
>
> They are all supposed to be stored in RAM. Note that all current ttm
> importers totally break the abstraction, by taking the sg list,
> throwing the dma mapping away and assuming there's a struct page
> backing it. Would be good if we could stop spreading that abuse - the
> dma-buf interfaces have been modelled after the ttm bo interfaces, so
> shouldn't be too hard to wire this up correctly.
>
> > Importing into TTM_PL_VRAM:  Impossible I think, without copying over
> > the data.  Should that be done?  If so, how?  Or is it better to just
> > not support import then?
>
> Hm, since you ask about TTM concepts and not what this means in terms
> of dma-buf: As long as you upcast to the ttm_bo you can do whatever
> you want to really. But with plain dma-buf this doesn't work right now
> (least because ttm assumes it gets system RAM on import, in theory you
> could put the peer2peer dma mapping into the sg list and it should
> work).
> -Daniel
>
> >
> > thanks,
> >   Gerd
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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Re: [PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Gerd Hoffmann]

  Hi,

> > If I understand things correctly it is valid to set all import/export
> > callbacks (prime_handle_to_fd, prime_fd_to_handle,
> > gem_prime_get_sg_table, gem_prime_import_sg_table) to NULL when not
> > supporting dma-buf import/export and still advertise DRIVER_PRIME to
> > indicate the other prime callbacks are supported (so generic fbdev
> > emulation can use gem_prime_vmap etc).  Is that correct?
> 
> I'm not sure how much that's a good idea ... Never thought about it
> tbh. All the fbdev/dma-buf stuff has plenty of hacks and
> inconsistencies still, so I guess we can't make it much worse really.

Setting prime_handle_to_fd + prime_fd_to_handle to NULL has the effect
that drm stops advertising DRM_PRIME_CAP_{IMPORT,EXPORT} to userspace.

Which looks better to me than telling userspace we support it then throw
errors unconditionally when userspace tries to use that.

> > Is it possible to export TTM_PL_VRAM objects (with backing storage being
> > a pci memory bar)?  If so, how?
> 
> Not really in general. amdgpu upcasts to amdgpu_bo (if it's amgpu BO)
> and then knows the internals so it can do a proper pci peer2peer
> mapping. Or at least there's been lots of patches floating around to
> make that happen.

That is limited to bo sharing between two amdgpu devices, correct?

> I think other drivers migrate the bo out of VRAM.

Well, that doesn't look too useful.  bochs and qxl virtual hardware
can't access buffers outside VRAM.  So, while I could migrate the
buffers to RAM (via memcpy) when exporting they would at the same time
become unusable for the GPU ...

> > On importing:
> >
> > Importing into TTM_PL_TT object looks easy again, at least when the
> > object is actually stored in RAM.  What if not?
> 
> They are all supposed to be stored in RAM. Note that all current ttm
> importers totally break the abstraction, by taking the sg list,
> throwing the dma mapping away and assuming there's a struct page
> backing it. Would be good if we could stop spreading that abuse - the
> dma-buf interfaces have been modelled after the ttm bo interfaces, so
> shouldn't be too hard to wire this up correctly.

Ok.  With virtio-gpu (where objects are backed by RAM pages anyway)
wiring this up should be easy.

But given there is no correct sample code I can look at it would be cool
if you could give some more hints how this is supposed to work.  The
gem_prime_import_sg_table() callback gets a sg list passed in after all,
so I probably would have tried to take the sg list too ...

> > Importing into TTM_PL_VRAM:  Impossible I think, without copying over
> > the data.  Should that be done?  If so, how?  Or is it better to just
> > not support import then?
> 
> Hm, since you ask about TTM concepts and not what this means in terms
> of dma-buf:

Ok, more details on the quesion:

dma-buf: whatever the driver gets passed into the
gem_prime_import_sg_table() callback.

import into TTM_PL_VRAM: qemu driver which supports VRAM storage only
(bochs, qxl), so the buffer has to be stored there if we want do
something with it (like scanning out to a crtc).

> As long as you upcast to the ttm_bo you can do whatever
> you want to really.

Well, if the dma-buf comes from another device (say export vgem bo, then
try import into bochs/qxl/virtio) I can't upcast.

When the dma-buf comes from the same device drm_gem_prime_import_dev()
will notice and take a shortcut (skip import, just increase refcount
instead), so I don't have to worry about that case in the
gem_prime_import_sg_table() callback.

> But with plain dma-buf this doesn't work right now
> (least because ttm assumes it gets system RAM on import, in theory you
> could put the peer2peer dma mapping into the sg list and it should
> work).

Well, qemu display devices don't have peer2peer dma support.
So I guess the answer is "doesn't work".

cheers,
  Gerd

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Re: [PATCH v2 15/15] drm/bochs: reserve bo for pin/unpin

[Daniel Vetter]

On Wed, Jan 9, 2019 at 9:52 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
>   Hi,
>
> > > If I understand things correctly it is valid to set all import/export
> > > callbacks (prime_handle_to_fd, prime_fd_to_handle,
> > > gem_prime_get_sg_table, gem_prime_import_sg_table) to NULL when not
> > > supporting dma-buf import/export and still advertise DRIVER_PRIME to
> > > indicate the other prime callbacks are supported (so generic fbdev
> > > emulation can use gem_prime_vmap etc).  Is that correct?
> >
> > I'm not sure how much that's a good idea ... Never thought about it
> > tbh. All the fbdev/dma-buf stuff has plenty of hacks and
> > inconsistencies still, so I guess we can't make it much worse really.
>
> Setting prime_handle_to_fd + prime_fd_to_handle to NULL has the effect
> that drm stops advertising DRM_PRIME_CAP_{IMPORT,EXPORT} to userspace.
>
> Which looks better to me than telling userspace we support it then throw
> errors unconditionally when userspace tries to use that.
>
> > > Is it possible to export TTM_PL_VRAM objects (with backing storage being
> > > a pci memory bar)?  If so, how?
> >
> > Not really in general. amdgpu upcasts to amdgpu_bo (if it's amgpu BO)
> > and then knows the internals so it can do a proper pci peer2peer
> > mapping. Or at least there's been lots of patches floating around to
> > make that happen.
>
> That is limited to bo sharing between two amdgpu devices, correct?
>
> > I think other drivers migrate the bo out of VRAM.
>
> Well, that doesn't look too useful.  bochs and qxl virtual hardware
> can't access buffers outside VRAM.  So, while I could migrate the
> buffers to RAM (via memcpy) when exporting they would at the same time
> become unusable for the GPU ...
>
> > > On importing:
> > >
> > > Importing into TTM_PL_TT object looks easy again, at least when the
> > > object is actually stored in RAM.  What if not?
> >
> > They are all supposed to be stored in RAM. Note that all current ttm
> > importers totally break the abstraction, by taking the sg list,
> > throwing the dma mapping away and assuming there's a struct page
> > backing it. Would be good if we could stop spreading that abuse - the
> > dma-buf interfaces have been modelled after the ttm bo interfaces, so
> > shouldn't be too hard to wire this up correctly.
>
> Ok.  With virtio-gpu (where objects are backed by RAM pages anyway)
> wiring this up should be easy.
>
> But given there is no correct sample code I can look at it would be cool
> if you could give some more hints how this is supposed to work.  The
> gem_prime_import_sg_table() callback gets a sg list passed in after all,
> so I probably would have tried to take the sg list too ...

I'm not a fan of that helper either, that's really the broken part
imo. i915 doesn't use it. It's a midlayer so that the nvidia blob can
avoid directly touching the EXPORT_SYMBOL_GPL dma-buf symbols, afaiui
there's really no other solid reason for it. What the new gem cma
helpers does is imo much better (it still uses the import_sg_table
midlayer, but oh well).

For ttm you'd need to make sure that all the various ttm cpu side
access functions also all go through the relevant dma-buf interfaces,
and not through the struct page list fished out of the sgt. That was
at least the idea, long ago.

> > > Importing into TTM_PL_VRAM:  Impossible I think, without copying over
> > > the data.  Should that be done?  If so, how?  Or is it better to just
> > > not support import then?
> >
> > Hm, since you ask about TTM concepts and not what this means in terms
> > of dma-buf:
>
> Ok, more details on the quesion:
>
> dma-buf: whatever the driver gets passed into the
> gem_prime_import_sg_table() callback.
>
> import into TTM_PL_VRAM: qemu driver which supports VRAM storage only
> (bochs, qxl), so the buffer has to be stored there if we want do
> something with it (like scanning out to a crtc).
>
> > As long as you upcast to the ttm_bo you can do whatever
> > you want to really.
>
> Well, if the dma-buf comes from another device (say export vgem bo, then
> try import into bochs/qxl/virtio) I can't upcast.

In that case you'll in practice only get system RAM, and you're not
allowed to move it (dma-buf is meant to be zero-copy after all). If
your hw can't scan these out directly, then userspace needs to arrange
for a buffer copy into a native buffer somehow (that's how Xorg prime
works at least I think). No idea whether your virtual gpus can make
use of that directly. You might also get some pci peer2peer range in
the future, but it's strictly opt-in (because there's too many dma-buf
importers that just blindly assume there's a struct page behind the
sgt).

> When the dma-buf comes from the same device drm_gem_prime_import_dev()
> will notice and take a shortcut (skip import, just increase refcount
> instead), so I don't have to worry about that case in the
> gem_prime_import_sg_table() callback.

You can also upcast if it's from the same driver, not just same device.
-Daniel

> > But with plain dma-buf this doesn't work right now
> > (least because ttm assumes it gets system RAM on import, in theory you
> > could put the peer2peer dma mapping into the sg list and it should
> > work).
>
> Well, qemu display devices don't have peer2peer dma support.
> So I guess the answer is "doesn't work".
>
> cheers,
>   Gerd
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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