On Sun, 7 Mar 2021 20:28:35 +0000 Paul Cercueil wrote: > With the module parameter ingenic-drm.cached_gem_buffers, it is possible > to specify that we want GEM buffers backed by non-coherent memory. > > This dramatically speeds up software rendering on Ingenic SoCs, even for > tasks where write-combine memory should in theory be faster (e.g. simple > blits).
Wondering if it is due to the tricks at [1]. If so, is dma_alloc_noncoherent() necessary in this patchset? Christoph can you give us a concise lesson on noncoherency covering at least noncoherent device, noncoherent memory(used in this work), no coherent caching(in [1]), their links to speedup, and the thumb rule to handle noncoherency in workdays. It feels toe curling every time I see noncoherence going downtown with speedup hand in hand. [1] Subject: [PATCH 6/6] media: uvcvideo: Use dma_alloc_noncontiguos API https://lore.kernel.org/lkml/20210301085236.947011-7-...@lst.de/#t > > Leave it disabled by default, since it is specific to one use-case > (software rendering). > > v2: Rework code to work with new DRM APIs regarding plane states > > Signed-off-by: Paul Cercueil <p...@crapouillou.net> > --- > drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 49 ++++++++++++++++++++++- > drivers/gpu/drm/ingenic/ingenic-drm.h | 4 ++ > drivers/gpu/drm/ingenic/ingenic-ipu.c | 14 ++++++- > 3 files changed, 63 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c > b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c > index d60e1eefc9d1..ba1ac0fcda74 100644 > --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c > +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c > @@ -9,6 +9,7 @@ > #include <linux/component.h> > #include <linux/clk.h> > #include <linux/dma-mapping.h> > +#include <linux/io.h> > #include <linux/module.h> > #include <linux/mutex.h> > #include <linux/of_device.h> > @@ -23,6 +24,7 @@ > #include <drm/drm_color_mgmt.h> > #include <drm/drm_crtc.h> > #include <drm/drm_crtc_helper.h> > +#include <drm/drm_damage_helper.h> > #include <drm/drm_drv.h> > #include <drm/drm_gem_cma_helper.h> > #include <drm/drm_fb_cma_helper.h> > @@ -99,6 +101,11 @@ struct ingenic_drm { > struct notifier_block clock_nb; > }; > > +static bool ingenic_drm_cached_gem_buf; > +module_param_named(cached_gem_buffers, ingenic_drm_cached_gem_buf, bool, > 0400); > +MODULE_PARM_DESC(cached_gem_buffers, > + "Enable fully cached GEM buffers [default=false]"); > + > static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg) > { > switch (reg) { > @@ -410,6 +417,8 @@ static int ingenic_drm_plane_atomic_check(struct > drm_plane *plane, > old_plane_state->fb->format->format != > new_plane_state->fb->format->format)) > crtc_state->mode_changed = true; > > + drm_atomic_helper_check_plane_damage(state, new_plane_state); > + > return 0; > } > > @@ -541,10 +550,20 @@ static void ingenic_drm_update_palette(struct > ingenic_drm *priv, > } > } > > +void ingenic_drm_sync_data(struct device *dev, > + struct drm_plane_state *old_state, > + struct drm_plane_state *state) > +{ > + if (ingenic_drm_cached_gem_buf) > + drm_gem_cma_sync_data(dev, old_state, state); > +} > + > static void ingenic_drm_plane_atomic_update(struct drm_plane *plane, > struct drm_atomic_state *state) > { > struct ingenic_drm *priv = drm_device_get_priv(plane->dev); > + struct drm_plane_state *oldstate = drm_atomic_get_old_plane_state(state, > + > plane); > struct drm_plane_state *newstate = drm_atomic_get_new_plane_state(state, > > plane); > struct drm_crtc_state *crtc_state; > @@ -554,6 +573,8 @@ static void ingenic_drm_plane_atomic_update(struct > drm_plane *plane, > u32 fourcc; > > if (newstate && newstate->fb) { > + ingenic_drm_sync_data(priv->dev, oldstate, newstate); > + > crtc_state = newstate->crtc->state; > > addr = drm_fb_cma_get_gem_addr(newstate->fb, newstate, 0); > @@ -743,6 +764,26 @@ static void ingenic_drm_disable_vblank(struct drm_crtc > *crtc) > regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0); > } > > +static struct drm_framebuffer * > +ingenic_drm_gem_fb_create(struct drm_device *dev, struct drm_file *file, > + const struct drm_mode_fb_cmd2 *mode_cmd) > +{ > + if (ingenic_drm_cached_gem_buf) > + return drm_gem_fb_create_with_dirty(dev, file, mode_cmd); > + > + return drm_gem_fb_create(dev, file, mode_cmd); > +} > + > +static int ingenic_drm_gem_cma_dumb_create(struct drm_file *file_priv, > + struct drm_device *drm, > + struct drm_mode_create_dumb *args) > +{ > + if (ingenic_drm_cached_gem_buf) > + return drm_gem_cma_dumb_create_noncoherent(file_priv, drm, > args); > + > + return drm_gem_cma_dumb_create(file_priv, drm, args); > +} > + > DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops); > > static const struct drm_driver ingenic_drm_driver_data = { > @@ -755,7 +796,7 @@ static const struct drm_driver ingenic_drm_driver_data = { > .patchlevel = 0, > > .fops = &ingenic_drm_fops, > - DRM_GEM_CMA_DRIVER_OPS, > + > DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(ingenic_drm_gem_cma_dumb_create), > > .irq_handler = ingenic_drm_irq_handler, > }; > @@ -805,7 +846,7 @@ static const struct drm_encoder_helper_funcs > ingenic_drm_encoder_helper_funcs = > }; > > static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = { > - .fb_create = drm_gem_fb_create, > + .fb_create = ingenic_drm_gem_fb_create, > .output_poll_changed = drm_fb_helper_output_poll_changed, > .atomic_check = drm_atomic_helper_check, > .atomic_commit = drm_atomic_helper_commit, > @@ -962,6 +1003,8 @@ static int ingenic_drm_bind(struct device *dev, bool > has_components) > return ret; > } > > + drm_plane_enable_fb_damage_clips(&priv->f1); > + > drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs); > > ret = drm_crtc_init_with_planes(drm, &priv->crtc, primary, > @@ -990,6 +1033,8 @@ static int ingenic_drm_bind(struct device *dev, bool > has_components) > return ret; > } > > + drm_plane_enable_fb_damage_clips(&priv->f0); > + > if (IS_ENABLED(CONFIG_DRM_INGENIC_IPU) && has_components) { > ret = component_bind_all(dev, drm); > if (ret) { > diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.h > b/drivers/gpu/drm/ingenic/ingenic-drm.h > index 1b4347f7f084..b6bca356e024 100644 > --- a/drivers/gpu/drm/ingenic/ingenic-drm.h > +++ b/drivers/gpu/drm/ingenic/ingenic-drm.h > @@ -185,6 +185,10 @@ void ingenic_drm_plane_config(struct device *dev, > struct drm_plane *plane, u32 fourcc); > void ingenic_drm_plane_disable(struct device *dev, struct drm_plane *plane); > > +void ingenic_drm_sync_data(struct device *dev, > + struct drm_plane_state *old_state, > + struct drm_plane_state *state); > + > extern struct platform_driver *ingenic_ipu_driver_ptr; > > #endif /* DRIVERS_GPU_DRM_INGENIC_INGENIC_DRM_H */ > diff --git a/drivers/gpu/drm/ingenic/ingenic-ipu.c > b/drivers/gpu/drm/ingenic/ingenic-ipu.c > index 5ae6adab8306..7826eab044ba 100644 > --- a/drivers/gpu/drm/ingenic/ingenic-ipu.c > +++ b/drivers/gpu/drm/ingenic/ingenic-ipu.c > @@ -20,6 +20,7 @@ > > #include <drm/drm_atomic.h> > #include <drm/drm_atomic_helper.h> > +#include <drm/drm_damage_helper.h> > #include <drm/drm_drv.h> > #include <drm/drm_fb_cma_helper.h> > #include <drm/drm_fourcc.h> > @@ -285,6 +286,8 @@ static void ingenic_ipu_plane_atomic_update(struct > drm_plane *plane, > struct drm_atomic_state *state) > { > struct ingenic_ipu *ipu = plane_to_ingenic_ipu(plane); > + struct drm_plane_state *oldstate = drm_atomic_get_old_plane_state(state, > + > plane); > struct drm_plane_state *newstate = drm_atomic_get_new_plane_state(state, > > plane); > const struct drm_format_info *finfo; > @@ -317,6 +320,8 @@ static void ingenic_ipu_plane_atomic_update(struct > drm_plane *plane, > JZ_IPU_CTRL_CHIP_EN | JZ_IPU_CTRL_LCDC_SEL); > } > > + ingenic_drm_sync_data(ipu->master, oldstate, newstate); > + > /* New addresses will be committed in vblank handler... */ > ipu->addr_y = drm_fb_cma_get_gem_addr(newstate->fb, newstate, 0); > if (finfo->num_planes > 1) > @@ -541,7 +546,7 @@ static int ingenic_ipu_plane_atomic_check(struct > drm_plane *plane, > > if (!new_plane_state->crtc || > !crtc_state->mode.hdisplay || !crtc_state->mode.vdisplay) > - return 0; > + goto out_check_damage; > > /* Plane must be fully visible */ > if (new_plane_state->crtc_x < 0 || new_plane_state->crtc_y < 0 || > @@ -558,7 +563,7 @@ static int ingenic_ipu_plane_atomic_check(struct > drm_plane *plane, > return -EINVAL; > > if (!osd_changed(new_plane_state, old_plane_state)) > - return 0; > + goto out_check_damage; > > crtc_state->mode_changed = true; > > @@ -592,6 +597,9 @@ static int ingenic_ipu_plane_atomic_check(struct > drm_plane *plane, > ipu->denom_w = denom_w; > ipu->denom_h = denom_h; > > +out_check_damage: > + drm_atomic_helper_check_plane_damage(state, new_plane_state); > + > return 0; > } > > @@ -773,6 +781,8 @@ static int ingenic_ipu_bind(struct device *dev, struct > device *master, void *d) > return err; > } > > + drm_plane_enable_fb_damage_clips(plane); > + > /* > * Sharpness settings range is [0,32] > * 0 : nearest-neighbor > -- > 2.30.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
