* Tony Lindgren <tony@xxxxxxxxxxx> [240227 11:47]: > * Thomas Zimmermann <tzimmermann@xxxxxxx> [240227 09:16]: > > I just realized the fb_deferred_io_mmap() is already exported. So please use > > it instead of duplicating the code in omapdrm. > > > > [1] https://elixir.bootlin.com/linux/v6.7/source/drivers/video/fbdev/core/fb_defio.c#L237 > > Yeah I have now: > > static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) > { > vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); > > return fb_deferred_io_mmap(info, vma); > } > > > I also noticed that omapdrm does not yet select the correct Kconfig symbols. > > That can be fixed by > > > > 1) creating Kconfig FB_DMAMEM_HELPERS_DEFERRED that are similar to their > > SYSMEM equivalent at [2]. The tokens should look like this > > > > configFB_DMAMEM_HELPERS_DEFERRED <https://elixir.bootlin.com/linux/latest/K/ident/CONFIG_FB_SYSMEM_HELPERS_DEFERRED> > > bool > > depends onFB_CORE <https://elixir.bootlin.com/linux/latest/K/ident/CONFIG_FB_CORE> > > selectFB_DEFERRED_IO <https://elixir.bootlin.com/linux/latest/K/ident/CONFIG_FB_DEFERRED_IO> > > selectFB_DMAMEM_HELPERS <https://elixir.bootlin.com/linux/latest/K/ident/CONFIG_FB_SYSMEM_HELPERS> > > OK > > > 2) and selecting it instead of FB_DMAMEM_HELPERS under omapdrm's Kconfig > > symbol. > > OK So here's what I have now, does that look OK? Regards, Tony 8< ------------------------- diff --git a/drivers/gpu/drm/omapdrm/Kconfig b/drivers/gpu/drm/omapdrm/Kconfig --- a/drivers/gpu/drm/omapdrm/Kconfig +++ b/drivers/gpu/drm/omapdrm/Kconfig @@ -4,7 +4,7 @@ config DRM_OMAP depends on DRM && OF depends on ARCH_OMAP2PLUS select DRM_KMS_HELPER - select FB_DMAMEM_HELPERS if DRM_FBDEV_EMULATION + select FB_DMAMEM_HELPERS_DEFERRED if DRM_FBDEV_EMULATION select VIDEOMODE_HELPERS select HDMI default n diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c --- a/drivers/gpu/drm/omapdrm/omap_fbdev.c +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c @@ -51,6 +51,10 @@ static void pan_worker(struct work_struct *work) omap_gem_roll(bo, fbi->var.yoffset * npages); } +FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev, + drm_fb_helper_damage_range, + drm_fb_helper_damage_area) + static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi) { @@ -78,11 +82,9 @@ static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) { - struct drm_fb_helper *helper = info->par; - struct drm_framebuffer *fb = helper->fb; - struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0); + vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); - return drm_gem_mmap_obj(bo, omap_gem_mmap_size(bo), vma); + return fb_deferred_io_mmap(info, vma); } static void omap_fbdev_fb_destroy(struct fb_info *info) @@ -94,6 +96,7 @@ static void omap_fbdev_fb_destroy(struct fb_info *info) DBG(); + fb_deferred_io_cleanup(info); drm_fb_helper_fini(helper); omap_gem_unpin(bo); @@ -104,15 +107,19 @@ static void omap_fbdev_fb_destroy(struct fb_info *info) kfree(fbdev); } +/* + * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap() + * because we use write-combine. + */ static const struct fb_ops omap_fb_ops = { .owner = THIS_MODULE, - __FB_DEFAULT_DMAMEM_OPS_RDWR, + __FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev), .fb_check_var = drm_fb_helper_check_var, .fb_set_par = drm_fb_helper_set_par, .fb_setcmap = drm_fb_helper_setcmap, .fb_blank = drm_fb_helper_blank, .fb_pan_display = omap_fbdev_pan_display, - __FB_DEFAULT_DMAMEM_OPS_DRAW, + __FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev), .fb_ioctl = drm_fb_helper_ioctl, .fb_mmap = omap_fbdev_fb_mmap, .fb_destroy = omap_fbdev_fb_destroy, @@ -213,6 +220,15 @@ static int omap_fbdev_create(struct drm_fb_helper *helper, fbi->fix.smem_start = dma_addr; fbi->fix.smem_len = bo->size; + /* deferred I/O */ + helper->fbdefio.delay = HZ / 20; + helper->fbdefio.deferred_io = drm_fb_helper_deferred_io; + + fbi->fbdefio = &helper->fbdefio; + ret = fb_deferred_io_init(fbi); + if (ret) + goto fail; + /* if we have DMM, then we can use it for scrolling by just * shuffling pages around in DMM rather than doing sw blit. */ diff --git a/drivers/video/fbdev/core/Kconfig b/drivers/video/fbdev/core/Kconfig --- a/drivers/video/fbdev/core/Kconfig +++ b/drivers/video/fbdev/core/Kconfig @@ -144,6 +144,12 @@ config FB_DMAMEM_HELPERS select FB_SYS_IMAGEBLIT select FB_SYSMEM_FOPS +config FB_DMAMEM_HELPERS_DEFERRED + bool + depends on FB_CORE + select FB_DEFERRED_IO + select FB_DMAMEM_HELPERS + config FB_IOMEM_FOPS tristate depends on FB_CORE diff --git a/include/linux/fb.h b/include/linux/fb.h --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -686,6 +686,10 @@ extern int fb_deferred_io_fsync(struct file *file, loff_t start, __FB_GEN_DEFAULT_DEFERRED_OPS_RDWR(__prefix, __damage_range, sys) \ __FB_GEN_DEFAULT_DEFERRED_OPS_DRAW(__prefix, __damage_area, sys) +#define FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(__prefix, __damage_range, __damage_area) \ + __FB_GEN_DEFAULT_DEFERRED_OPS_RDWR(__prefix, __damage_range, sys) \ + __FB_GEN_DEFAULT_DEFERRED_OPS_DRAW(__prefix, __damage_area, sys) + /* * Initializes struct fb_ops for deferred I/O. */ -- 2.43.1
