1 // SPDX-License-Identifier: GPL-2.0-or-later
6  *   Author: Lars-Peter Clausen <lars@metafoo.de>
20 #include <linux/dma-mapping.h>
26  * Provides helper functions for creating a DMA-contiguous framebuffer.
28  * Depending on the platform, the buffers may be physically non-contiguous and
30  * physically-contiguous memory (using, for instance, CMA or a pool of memory
35  * callback function to create a DMA-contiguous framebuffer.
39  * drm_fb_dma_get_gem_obj() - Get DMA GEM object for framebuffer
61  * drm_fb_dma_get_gem_addr() - Get DMA (bus) address for framebuffer, for pixel
78 	u32 block_w = drm_format_info_block_width(fb->format, plane);  in drm_fb_dma_get_gem_addr()
79 	u32 block_h = drm_format_info_block_height(fb->format, plane);  in drm_fb_dma_get_gem_addr()
80 	u32 block_size = fb->format->char_per_block[plane];  in drm_fb_dma_get_gem_addr()
90 	dma_addr = obj->dma_addr + fb->offsets[plane];  in drm_fb_dma_get_gem_addr()
93 		h_div = fb->format->hsub;  in drm_fb_dma_get_gem_addr()
94 		v_div = fb->format->vsub;  in drm_fb_dma_get_gem_addr()
97 	sample_x = (state->src_x >> 16) / h_div;  in drm_fb_dma_get_gem_addr()
98 	sample_y = (state->src_y >> 16) / v_div;  in drm_fb_dma_get_gem_addr()
102 	dma_addr += fb->pitches[plane] * block_start_y;  in drm_fb_dma_get_gem_addr()
110  * drm_fb_dma_sync_non_coherent - Sync GEM object to non-coherent backing
117  * DMA GEM objects backed by non-coherent memory. Calling this function
125 	const struct drm_format_info *finfo = state->fb->format;  in drm_fb_dma_sync_non_coherent()
133 	for (i = 0; i < finfo->num_planes; i++) {  in drm_fb_dma_sync_non_coherent()
134 		dma_obj = drm_fb_dma_get_gem_obj(state->fb, i);  in drm_fb_dma_sync_non_coherent()
135 		if (!dma_obj->map_noncoherent)  in drm_fb_dma_sync_non_coherent()
138 		daddr = drm_fb_dma_get_gem_addr(state->fb, state, i);  in drm_fb_dma_sync_non_coherent()
143 			offset = clip.y1 * state->fb->pitches[i];  in drm_fb_dma_sync_non_coherent()
145 			nb_bytes = (clip.y2 - clip.y1) * state->fb->pitches[i];  in drm_fb_dma_sync_non_coherent()
146 			dma_sync_single_for_device(drm->dev, daddr + offset,  in drm_fb_dma_sync_non_coherent()
154  * drm_fb_dma_get_scanout_buffer - Provide a scanout buffer in case of panic
170 	if (!plane->state || !plane->state->fb)  in drm_fb_dma_get_scanout_buffer()
171 		return -EINVAL;  in drm_fb_dma_get_scanout_buffer()
173 	fb = plane->state->fb;  in drm_fb_dma_get_scanout_buffer()
175 	if (fb->modifier != DRM_FORMAT_MOD_LINEAR)  in drm_fb_dma_get_scanout_buffer()
176 		return -ENODEV;  in drm_fb_dma_get_scanout_buffer()
181 	if (dma_obj->base.import_attach)  in drm_fb_dma_get_scanout_buffer()
182 		return -ENODEV;  in drm_fb_dma_get_scanout_buffer()
185 	if (!dma_obj->vaddr)  in drm_fb_dma_get_scanout_buffer()
186 		return -ENODEV;  in drm_fb_dma_get_scanout_buffer()
188 	iosys_map_set_vaddr(&sb->map[0], dma_obj->vaddr);  in drm_fb_dma_get_scanout_buffer()
189 	sb->format = fb->format;  in drm_fb_dma_get_scanout_buffer()
190 	sb->height = fb->height;  in drm_fb_dma_get_scanout_buffer()
191 	sb->width = fb->width;  in drm_fb_dma_get_scanout_buffer()
192 	sb->pitch[0] = fb->pitches[0];  in drm_fb_dma_get_scanout_buffer()