drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c - linux - Git at Google

 /*
  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */


 #include "mdp5_kms.h"
 #include "mdp5_smp.h"


 struct mdp5_smp {
 	struct drm_device *dev;

 	uint8_t reserved[MAX_CLIENTS]; /* fixed MMBs allocation per client */

 	int blk_cnt;
 	int blk_size;
 };

 static inline
 struct mdp5_kms *get_kms(struct mdp5_smp *smp)
 {
 	struct msm_drm_private *priv = smp->dev->dev_private;

 	return to_mdp5_kms(to_mdp_kms(priv->kms));
 }

 static inline u32 pipe2client(enum mdp5_pipe pipe, int plane)
 {
 #define CID_UNUSED	0

 	if (WARN_ON(plane >= pipe2nclients(pipe)))
 		return CID_UNUSED;

 	/*
 	 * Note on SMP clients:
 	 * For ViG pipes, fetch Y/Cr/Cb-components clients are always
 	 * consecutive, and in that order.
 	 *
 	 * e.g.:
 	 * if mdp5_cfg->smp.clients[SSPP_VIG0] = N,
 	 *	Y  plane's client ID is N
 	 *	Cr plane's client ID is N + 1
 	 *	Cb plane's client ID is N + 2
 	 */

 	return mdp5_cfg->smp.clients[pipe] + plane;
 }

 /* allocate blocks for the specified request: */
 static int smp_request_block(struct mdp5_smp *smp,
 		struct mdp5_smp_state *state,
 		u32 cid, int nblks)
 {
 	void *cs = state->client_state[cid];
 	int i, avail, cnt = smp->blk_cnt;
 	uint8_t reserved;

 	/* we shouldn't be requesting blocks for an in-use client: */
 	WARN_ON(bitmap_weight(cs, cnt) > 0);

 	reserved = smp->reserved[cid];

 	if (reserved) {
 		nblks = max(0, nblks - reserved);
 		DBG("%d MMBs allocated (%d reserved)", nblks, reserved);
 	}

 	avail = cnt - bitmap_weight(state->state, cnt);
 	if (nblks > avail) {
 		dev_err(smp->dev->dev, "out of blks (req=%d > avail=%d)\n",
 				nblks, avail);
 		return -ENOSPC;
 	}

 	for (i = 0; i < nblks; i++) {
 		int blk = find_first_zero_bit(state->state, cnt);
 		set_bit(blk, cs);
 		set_bit(blk, state->state);
 	}

 	return 0;
 }

 static void set_fifo_thresholds(struct mdp5_smp *smp,
 		enum mdp5_pipe pipe, int nblks)
 {
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
 	u32 smp_entries_per_blk = smp->blk_size / (128 / BITS_PER_BYTE);
 	u32 val;

 	/* 1/4 of SMP pool that is being fetched */
 	val = (nblks * smp_entries_per_blk) / 4;

 	mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_0(pipe), val * 1);
 	mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_1(pipe), val * 2);
 	mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_2(pipe), val * 3);
 }

 /*
  * NOTE: looks like if horizontal decimation is used (if we supported that)
  * then the width used to calculate SMP block requirements is the post-
  * decimated width.  Ie. SMP buffering sits downstream of decimation (which
  * presumably happens during the dma from scanout buffer).
  */
 uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
 		const struct mdp_format *format,
 		u32 width, bool hdecim)
 {
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
 	int rev = mdp5_cfg_get_hw_rev(mdp5_kms->cfg);
 	int i, hsub, nplanes, nlines;
 	u32 fmt = format->base.pixel_format;
 	uint32_t blkcfg = 0;

 	nplanes = drm_format_num_planes(fmt);
 	hsub = drm_format_horz_chroma_subsampling(fmt);

 	/* different if BWC (compressed framebuffer?) enabled: */
 	nlines = 2;

 	/* Newer MDPs have split/packing logic, which fetches sub-sampled
 	 * U and V components (splits them from Y if necessary) and packs
 	 * them together, writes to SMP using a single client.
 	 */
 	if ((rev > 0) && (format->chroma_sample > CHROMA_FULL)) {
 		fmt = DRM_FORMAT_NV24;
 		nplanes = 2;

 		/* if decimation is enabled, HW decimates less on the
 		 * sub sampled chroma components
 		 */
 		if (hdecim && (hsub > 1))
 			hsub = 1;
 	}

 	for (i = 0; i < nplanes; i++) {
 		int n, fetch_stride, cpp;

 		cpp = drm_format_plane_cpp(fmt, i);
 		fetch_stride = width * cpp / (i ? hsub : 1);

 		n = DIV_ROUND_UP(fetch_stride * nlines, smp->blk_size);

 		/* for hw rev v1.00 */
 		if (rev == 0)
 			n = roundup_pow_of_two(n);

 		blkcfg |= (n << (8 * i));
 	}

 	return blkcfg;
 }

 int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state,
 		enum mdp5_pipe pipe, uint32_t blkcfg)
 {
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
 	struct drm_device *dev = mdp5_kms->dev;
 	int i, ret;

 	for (i = 0; i < pipe2nclients(pipe); i++) {
 		u32 cid = pipe2client(pipe, i);
 		int n = blkcfg & 0xff;

 		if (!n)
 			continue;

 		DBG("%s[%d]: request %d SMP blocks", pipe2name(pipe), i, n);
 		ret = smp_request_block(smp, state, cid, n);
 		if (ret) {
 			dev_err(dev->dev, "Cannot allocate %d SMP blocks: %d\n",
 					n, ret);
 			return ret;
 		}

 		blkcfg >>= 8;
 	}

 	state->assigned |= (1 << pipe);

 	return 0;
 }

 /* Release SMP blocks for all clients of the pipe */
 void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state,
 		enum mdp5_pipe pipe)
 {
 	int i;
 	int cnt = smp->blk_cnt;

 	for (i = 0; i < pipe2nclients(pipe); i++) {
 		u32 cid = pipe2client(pipe, i);
 		void *cs = state->client_state[cid];

 		/* update global state: */
 		bitmap_andnot(state->state, state->state, cs, cnt);

 		/* clear client's state */
 		bitmap_zero(cs, cnt);
 	}

 	state->released |= (1 << pipe);
 }

 /* NOTE: SMP_ALLOC_* regs are *not* double buffered, so release has to
  * happen after scanout completes.
  */
 static unsigned update_smp_state(struct mdp5_smp *smp,
 		u32 cid, mdp5_smp_state_t *assigned)
 {
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
 	int cnt = smp->blk_cnt;
 	unsigned nblks = 0;
 	u32 blk, val;

 	for_each_set_bit(blk, *assigned, cnt) {
 		int idx = blk / 3;
 		int fld = blk % 3;

 		val = mdp5_read(mdp5_kms, REG_MDP5_SMP_ALLOC_W_REG(idx));

 		switch (fld) {
 		case 0:
 			val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT0__MASK;
 			val |= MDP5_SMP_ALLOC_W_REG_CLIENT0(cid);
 			break;
 		case 1:
 			val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT1__MASK;
 			val |= MDP5_SMP_ALLOC_W_REG_CLIENT1(cid);
 			break;
 		case 2:
 			val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT2__MASK;
 			val |= MDP5_SMP_ALLOC_W_REG_CLIENT2(cid);
 			break;
 		}

 		mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_W_REG(idx), val);
 		mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_R_REG(idx), val);

 		nblks++;
 	}

 	return nblks;
 }

 void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state)
 {
 	enum mdp5_pipe pipe;

 	for_each_set_bit(pipe, &state->assigned, sizeof(state->assigned) * 8) {
 		unsigned i, nblks = 0;

 		for (i = 0; i < pipe2nclients(pipe); i++) {
 			u32 cid = pipe2client(pipe, i);
 			void *cs = state->client_state[cid];

 			nblks += update_smp_state(smp, cid, cs);

 			DBG("assign %s:%u, %u blks",
 				pipe2name(pipe), i, nblks);
 		}

 		set_fifo_thresholds(smp, pipe, nblks);
 	}

 	state->assigned = 0;
 }

 void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state)
 {
 	enum mdp5_pipe pipe;

 	for_each_set_bit(pipe, &state->released, sizeof(state->released) * 8) {
 		DBG("release %s", pipe2name(pipe));
 		set_fifo_thresholds(smp, pipe, 0);
 	}

 	state->released = 0;
 }

 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p)
 {
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
 	struct mdp5_hw_pipe_state *hwpstate;
 	struct mdp5_smp_state *state;
 	int total = 0, i, j;

 	drm_printf(p, "name\tinuse\tplane\n");
 	drm_printf(p, "----\t-----\t-----\n");

 	if (drm_can_sleep())
 		drm_modeset_lock(&mdp5_kms->state_lock, NULL);

 	/* grab these *after* we hold the state_lock */
 	hwpstate = &mdp5_kms->state->hwpipe;
 	state = &mdp5_kms->state->smp;

 	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
 		struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i];
 		struct drm_plane *plane = hwpstate->hwpipe_to_plane[hwpipe->idx];
 		enum mdp5_pipe pipe = hwpipe->pipe;
 		for (j = 0; j < pipe2nclients(pipe); j++) {
 			u32 cid = pipe2client(pipe, j);
 			void *cs = state->client_state[cid];
 			int inuse = bitmap_weight(cs, smp->blk_cnt);

 			drm_printf(p, "%s:%d\t%d\t%s\n",
 				pipe2name(pipe), j, inuse,
 				plane ? plane->name : NULL);

 			total += inuse;
 		}
 	}

 	drm_printf(p, "TOTAL:\t%d\t(of %d)\n", total, smp->blk_cnt);
 	drm_printf(p, "AVAIL:\t%d\n", smp->blk_cnt -
 			bitmap_weight(state->state, smp->blk_cnt));

 	if (drm_can_sleep())
 		drm_modeset_unlock(&mdp5_kms->state_lock);
 }

 void mdp5_smp_destroy(struct mdp5_smp *smp)
 {
 	kfree(smp);
 }

 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_block *cfg)
 {
 	struct mdp5_smp_state *state = &mdp5_kms->state->smp;
 	struct mdp5_smp *smp = NULL;
 	int ret;

 	smp = kzalloc(sizeof(*smp), GFP_KERNEL);
 	if (unlikely(!smp)) {
 		ret = -ENOMEM;
 		goto fail;
 	}

 	smp->dev = mdp5_kms->dev;
 	smp->blk_cnt = cfg->mmb_count;
 	smp->blk_size = cfg->mmb_size;

 	/* statically tied MMBs cannot be re-allocated: */
 	bitmap_copy(state->state, cfg->reserved_state, smp->blk_cnt);
 	memcpy(smp->reserved, cfg->reserved, sizeof(smp->reserved));

 	return smp;
 fail:
 	if (smp)
 		mdp5_smp_destroy(smp);

 	return ERR_PTR(ret);
 }
	/*
	* Copyright (c) 2014, The Linux Foundation. All rights reserved.
	* Copyright (C) 2013 Red Hat
	* Author: Rob Clark <robdclark@gmail.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program. If not, see <http://www.gnu.org/licenses/>.
	*/


	#include "mdp5_kms.h"
	#include "mdp5_smp.h"


	struct mdp5_smp {
	struct drm_device *dev;

	uint8_t reserved[MAX_CLIENTS]; /* fixed MMBs allocation per client */

	int blk_cnt;
	int blk_size;
	};

	static inline
	struct mdp5_kms get_kms(struct mdp5_smp smp)
	{
	struct msm_drm_private *priv = smp->dev->dev_private;

	return to_mdp5_kms(to_mdp_kms(priv->kms));
	}

	static inline u32 pipe2client(enum mdp5_pipe pipe, int plane)
	{
	#define CID_UNUSED 0

	if (WARN_ON(plane >= pipe2nclients(pipe)))
	return CID_UNUSED;

	/*
	* Note on SMP clients:
	* For ViG pipes, fetch Y/Cr/Cb-components clients are always
	* consecutive, and in that order.
	*
	* e.g.:
	* if mdp5_cfg->smp.clients[SSPP_VIG0] = N,
	* Y plane's client ID is N
	* Cr plane's client ID is N + 1
	* Cb plane's client ID is N + 2
	*/

	return mdp5_cfg->smp.clients[pipe] + plane;
	}

	/* allocate blocks for the specified request: */
	static int smp_request_block(struct mdp5_smp *smp,
	struct mdp5_smp_state *state,
	u32 cid, int nblks)
	{
	void *cs = state->client_state[cid];
	int i, avail, cnt = smp->blk_cnt;
	uint8_t reserved;

	/* we shouldn't be requesting blocks for an in-use client: */
	WARN_ON(bitmap_weight(cs, cnt) > 0);

	reserved = smp->reserved[cid];

	if (reserved) {
	nblks = max(0, nblks - reserved);
	DBG("%d MMBs allocated (%d reserved)", nblks, reserved);
	}

	avail = cnt - bitmap_weight(state->state, cnt);
	if (nblks > avail) {
	dev_err(smp->dev->dev, "out of blks (req=%d > avail=%d)\n",
	nblks, avail);
	return -ENOSPC;
	}

	for (i = 0; i < nblks; i++) {
	int blk = find_first_zero_bit(state->state, cnt);
	set_bit(blk, cs);
	set_bit(blk, state->state);
	}

	return 0;
	}

	static void set_fifo_thresholds(struct mdp5_smp *smp,
	enum mdp5_pipe pipe, int nblks)
	{
	struct mdp5_kms *mdp5_kms = get_kms(smp);
	u32 smp_entries_per_blk = smp->blk_size / (128 / BITS_PER_BYTE);
	u32 val;

	/* 1/4 of SMP pool that is being fetched */
	val = (nblks * smp_entries_per_blk) / 4;

	mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_0(pipe), val * 1);
	mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_1(pipe), val * 2);
	mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_2(pipe), val * 3);
	}

	/*
	* NOTE: looks like if horizontal decimation is used (if we supported that)
	* then the width used to calculate SMP block requirements is the post-
	* decimated width. Ie. SMP buffering sits downstream of decimation (which
	* presumably happens during the dma from scanout buffer).
	*/
	uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
	const struct mdp_format *format,
	u32 width, bool hdecim)
	{
	struct mdp5_kms *mdp5_kms = get_kms(smp);
	int rev = mdp5_cfg_get_hw_rev(mdp5_kms->cfg);
	int i, hsub, nplanes, nlines;
	u32 fmt = format->base.pixel_format;
	uint32_t blkcfg = 0;

	nplanes = drm_format_num_planes(fmt);
	hsub = drm_format_horz_chroma_subsampling(fmt);

	/* different if BWC (compressed framebuffer?) enabled: */
	nlines = 2;

	/* Newer MDPs have split/packing logic, which fetches sub-sampled
	* U and V components (splits them from Y if necessary) and packs
	* them together, writes to SMP using a single client.
	*/
	if ((rev > 0) && (format->chroma_sample > CHROMA_FULL)) {
	fmt = DRM_FORMAT_NV24;
	nplanes = 2;

	/* if decimation is enabled, HW decimates less on the
	* sub sampled chroma components
	*/
	if (hdecim && (hsub > 1))
	hsub = 1;
	}

	for (i = 0; i < nplanes; i++) {
	int n, fetch_stride, cpp;

	cpp = drm_format_plane_cpp(fmt, i);
	fetch_stride = width * cpp / (i ? hsub : 1);

	n = DIV_ROUND_UP(fetch_stride * nlines, smp->blk_size);

	/* for hw rev v1.00 */
	if (rev == 0)
	n = roundup_pow_of_two(n);

	blkcfg \|= (n << (8 * i));
	}

	return blkcfg;
	}

	int mdp5_smp_assign(struct mdp5_smp smp, struct mdp5_smp_state state,
	enum mdp5_pipe pipe, uint32_t blkcfg)
	{
	struct mdp5_kms *mdp5_kms = get_kms(smp);
	struct drm_device *dev = mdp5_kms->dev;
	int i, ret;

	for (i = 0; i < pipe2nclients(pipe); i++) {
	u32 cid = pipe2client(pipe, i);
	int n = blkcfg & 0xff;

	if (!n)
	continue;

	DBG("%s[%d]: request %d SMP blocks", pipe2name(pipe), i, n);
	ret = smp_request_block(smp, state, cid, n);
	if (ret) {
	dev_err(dev->dev, "Cannot allocate %d SMP blocks: %d\n",
	n, ret);
	return ret;
	}

	blkcfg >>= 8;
	}

	state->assigned \|= (1 << pipe);

	return 0;
	}

	/* Release SMP blocks for all clients of the pipe */
	void mdp5_smp_release(struct mdp5_smp smp, struct mdp5_smp_state state,
	enum mdp5_pipe pipe)
	{
	int i;
	int cnt = smp->blk_cnt;

	for (i = 0; i < pipe2nclients(pipe); i++) {
	u32 cid = pipe2client(pipe, i);
	void *cs = state->client_state[cid];

	/* update global state: */
	bitmap_andnot(state->state, state->state, cs, cnt);

	/* clear client's state */
	bitmap_zero(cs, cnt);
	}

	state->released \|= (1 << pipe);
	}

	/* NOTE: SMP_ALLOC_* regs are not double buffered, so release has to
	* happen after scanout completes.
	*/
	static unsigned update_smp_state(struct mdp5_smp *smp,
	u32 cid, mdp5_smp_state_t *assigned)
	{
	struct mdp5_kms *mdp5_kms = get_kms(smp);
	int cnt = smp->blk_cnt;
	unsigned nblks = 0;
	u32 blk, val;

	for_each_set_bit(blk, *assigned, cnt) {
	int idx = blk / 3;
	int fld = blk % 3;

	val = mdp5_read(mdp5_kms, REG_MDP5_SMP_ALLOC_W_REG(idx));

	switch (fld) {
	case 0:
	val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT0__MASK;
	val \|= MDP5_SMP_ALLOC_W_REG_CLIENT0(cid);
	break;
	case 1:
	val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT1__MASK;
	val \|= MDP5_SMP_ALLOC_W_REG_CLIENT1(cid);
	break;
	case 2:
	val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT2__MASK;
	val \|= MDP5_SMP_ALLOC_W_REG_CLIENT2(cid);
	break;
	}

	mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_W_REG(idx), val);
	mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_R_REG(idx), val);

	nblks++;
	}

	return nblks;
	}

	void mdp5_smp_prepare_commit(struct mdp5_smp smp, struct mdp5_smp_state state)
	{
	enum mdp5_pipe pipe;

	for_each_set_bit(pipe, &state->assigned, sizeof(state->assigned) * 8) {
	unsigned i, nblks = 0;

	for (i = 0; i < pipe2nclients(pipe); i++) {
	u32 cid = pipe2client(pipe, i);
	void *cs = state->client_state[cid];

	nblks += update_smp_state(smp, cid, cs);

	DBG("assign %s:%u, %u blks",
	pipe2name(pipe), i, nblks);
	}

	set_fifo_thresholds(smp, pipe, nblks);
	}

	state->assigned = 0;
	}

	void mdp5_smp_complete_commit(struct mdp5_smp smp, struct mdp5_smp_state state)
	{
	enum mdp5_pipe pipe;

	for_each_set_bit(pipe, &state->released, sizeof(state->released) * 8) {
	DBG("release %s", pipe2name(pipe));
	set_fifo_thresholds(smp, pipe, 0);
	}

	state->released = 0;
	}

	void mdp5_smp_dump(struct mdp5_smp smp, struct drm_printer p)
	{
	struct mdp5_kms *mdp5_kms = get_kms(smp);
	struct mdp5_hw_pipe_state *hwpstate;
	struct mdp5_smp_state *state;
	int total = 0, i, j;

	drm_printf(p, "name\tinuse\tplane\n");
	drm_printf(p, "----\t-----\t-----\n");

	if (drm_can_sleep())
	drm_modeset_lock(&mdp5_kms->state_lock, NULL);

	/* grab these after we hold the state_lock */
	hwpstate = &mdp5_kms->state->hwpipe;
	state = &mdp5_kms->state->smp;

	for (i = 0; i < mdp5_kms->num_hwpipes; i++) {
	struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i];
	struct drm_plane *plane = hwpstate->hwpipe_to_plane[hwpipe->idx];
	enum mdp5_pipe pipe = hwpipe->pipe;
	for (j = 0; j < pipe2nclients(pipe); j++) {
	u32 cid = pipe2client(pipe, j);
	void *cs = state->client_state[cid];
	int inuse = bitmap_weight(cs, smp->blk_cnt);

	drm_printf(p, "%s:%d\t%d\t%s\n",
	pipe2name(pipe), j, inuse,
	plane ? plane->name : NULL);

	total += inuse;
	}
	}

	drm_printf(p, "TOTAL:\t%d\t(of %d)\n", total, smp->blk_cnt);
	drm_printf(p, "AVAIL:\t%d\n", smp->blk_cnt -
	bitmap_weight(state->state, smp->blk_cnt));

	if (drm_can_sleep())
	drm_modeset_unlock(&mdp5_kms->state_lock);
	}

	void mdp5_smp_destroy(struct mdp5_smp *smp)
	{
	kfree(smp);
	}

	struct mdp5_smp mdp5_smp_init(struct mdp5_kms mdp5_kms, const struct mdp5_smp_block *cfg)
	{
	struct mdp5_smp_state *state = &mdp5_kms->state->smp;
	struct mdp5_smp *smp = NULL;
	int ret;

	smp = kzalloc(sizeof(*smp), GFP_KERNEL);
	if (unlikely(!smp)) {
	ret = -ENOMEM;
	goto fail;
	}

	smp->dev = mdp5_kms->dev;
	smp->blk_cnt = cfg->mmb_count;
	smp->blk_size = cfg->mmb_size;

	/* statically tied MMBs cannot be re-allocated: */
	bitmap_copy(state->state, cfg->reserved_state, smp->blk_cnt);
	memcpy(smp->reserved, cfg->reserved, sizeof(smp->reserved));

	return smp;
	fail:
	if (smp)
	mdp5_smp_destroy(smp);

	return ERR_PTR(ret);
	}