1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2013 Red Hat
  4 * Author: Rob Clark <robdclark@gmail.com>
  5 */
  6
  7#include <drm/drm_crtc.h>
  8#include <drm/drm_damage_helper.h>
  9#include <drm/drm_file.h>
 10#include <drm/drm_fourcc.h>
 11#include <drm/drm_gem_framebuffer_helper.h>
 12#include <drm/drm_probe_helper.h>
 13
 14#include "msm_drv.h"
 15#include "msm_kms.h"
 16#include "msm_gem.h"
 17
 18struct msm_framebuffer {
 19	struct drm_framebuffer base;
 20	const struct msm_format *format;
 21};
 22#define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
 23
 24static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 25		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
 26
 27static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
 28	.create_handle = drm_gem_fb_create_handle,
 29	.destroy = drm_gem_fb_destroy,
 30	.dirty = drm_atomic_helper_dirtyfb,
 31};
 32
 33#ifdef CONFIG_DEBUG_FS
 34void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 35{
 36	int i, n = fb->format->num_planes;
 37
 38	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
 39			fb->width, fb->height, (char *)&fb->format->format,
 40			drm_framebuffer_read_refcount(fb), fb->base.id);
 41
 42	for (i = 0; i < n; i++) {
 43		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 44				i, fb->offsets[i], fb->pitches[i]);
 45		msm_gem_describe(fb->obj[i], m);
 46	}
 47}
 48#endif
 49
 50/* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
 51 * to prepare an fb more multiple different initiator 'id's.  But that
 52 * should be fine, since only the scanout (mdpN) side of things needs
 53 * this, the gpu doesn't care about fb's.
 54 */
 55int msm_framebuffer_prepare(struct drm_framebuffer *fb,
 56		struct msm_gem_address_space *aspace)
 57{
 58	int ret, i, n = fb->format->num_planes;
 59	uint64_t iova;
 60
 61	for (i = 0; i < n; i++) {
 62		ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &iova);
 63		DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
 64		if (ret)
 65			return ret;
 66	}
 67
 68	return 0;
 69}
 70
 71void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
 72		struct msm_gem_address_space *aspace)
 73{
 74	int i, n = fb->format->num_planes;
 75
 76	for (i = 0; i < n; i++)
 77		msm_gem_unpin_iova(fb->obj[i], aspace);
 78}
 79
 80uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 81		struct msm_gem_address_space *aspace, int plane)
 82{
 83	if (!fb->obj[plane])
 84		return 0;
 85	return msm_gem_iova(fb->obj[plane], aspace) + fb->offsets[plane];
 86}
 87
 88struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 89{
 90	return drm_gem_fb_get_obj(fb, plane);
 91}
 92
 93const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 94{
 95	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 96	return msm_fb->format;
 97}
 98
 99struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
100		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
101{
102	const struct drm_format_info *info = drm_get_format_info(dev,
103								 mode_cmd);
104	struct drm_gem_object *bos[4] = {0};
105	struct drm_framebuffer *fb;
106	int ret, i, n = info->num_planes;
107
108	for (i = 0; i < n; i++) {
109		bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
110		if (!bos[i]) {
111			ret = -ENXIO;
112			goto out_unref;
113		}
114	}
115
116	fb = msm_framebuffer_init(dev, mode_cmd, bos);
117	if (IS_ERR(fb)) {
118		ret = PTR_ERR(fb);
119		goto out_unref;
120	}
121
122	return fb;
123
124out_unref:
125	for (i = 0; i < n; i++)
126		drm_gem_object_put(bos[i]);
127	return ERR_PTR(ret);
128}
129
130static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
131		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
132{
133	const struct drm_format_info *info = drm_get_format_info(dev,
134								 mode_cmd);
135	struct msm_drm_private *priv = dev->dev_private;
136	struct msm_kms *kms = priv->kms;
137	struct msm_framebuffer *msm_fb = NULL;
138	struct drm_framebuffer *fb;
139	const struct msm_format *format;
140	int ret, i, n;
141
142	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
143			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
144			(char *)&mode_cmd->pixel_format);
145
146	n = info->num_planes;
147	format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
148			mode_cmd->modifier[0]);
149	if (!format) {
150		DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
151				(char *)&mode_cmd->pixel_format);
152		ret = -EINVAL;
153		goto fail;
154	}
155
156	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
157	if (!msm_fb) {
158		ret = -ENOMEM;
159		goto fail;
160	}
161
162	fb = &msm_fb->base;
163
164	msm_fb->format = format;
165
166	if (n > ARRAY_SIZE(fb->obj)) {
167		ret = -EINVAL;
168		goto fail;
169	}
170
171	for (i = 0; i < n; i++) {
172		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
173		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
174		unsigned int min_size;
175
176		min_size = (height - 1) * mode_cmd->pitches[i]
177			 + width * info->cpp[i]
178			 + mode_cmd->offsets[i];
179
180		if (bos[i]->size < min_size) {
181			ret = -EINVAL;
182			goto fail;
183		}
184
185		msm_fb->base.obj[i] = bos[i];
186	}
187
188	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
189
190	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
191	if (ret) {
192		DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
193		goto fail;
194	}
195
196	DBG("create: FB ID: %d (%p)", fb->base.id, fb);
197
198	return fb;
199
200fail:
201	kfree(msm_fb);
202
203	return ERR_PTR(ret);
204}
205
206struct drm_framebuffer *
207msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
208{
209	struct drm_mode_fb_cmd2 mode_cmd = {
210		.pixel_format = format,
211		.width = w,
212		.height = h,
213		.pitches = { p },
214	};
215	struct drm_gem_object *bo;
216	struct drm_framebuffer *fb;
217	int size;
218
219	/* allocate backing bo */
220	size = mode_cmd.pitches[0] * mode_cmd.height;
221	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
222	bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
223	if (IS_ERR(bo)) {
224		dev_warn(dev->dev, "could not allocate stolen bo\n");
225		/* try regular bo: */
226		bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
227	}
228	if (IS_ERR(bo)) {
229		DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
230		return ERR_CAST(bo);
231	}
232
233	msm_gem_object_set_name(bo, "stolenfb");
234
235	fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
236	if (IS_ERR(fb)) {
237		DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
238		/* note: if fb creation failed, we can't rely on fb destroy
239		 * to unref the bo:
240		 */
241		drm_gem_object_put(bo);
242		return ERR_CAST(fb);
243	}
244
245	return fb;
246}