drivers/gpu/drm/msm/adreno/adreno_gpu.c - kernel/lockdown - Git at Google

 /*
  * 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 "adreno_gpu.h"
 #include "msm_gem.h"
 #include "msm_mmu.h"

 struct adreno_info {
 	struct adreno_rev rev;
 	uint32_t revn;
 	const char *name;
 	const char *pm4fw, *pfpfw;
 	uint32_t gmem;
 };

 #define ANY_ID 0xff

 static const struct adreno_info gpulist[] = {
 	{
 		.rev   = ADRENO_REV(3, 0, 5, ANY_ID),
 		.revn  = 305,
 		.name  = "A305",
 		.pm4fw = "a300_pm4.fw",
 		.pfpfw = "a300_pfp.fw",
 		.gmem  = SZ_256K,
 	}, {
 		.rev   = ADRENO_REV(3, 2, ANY_ID, ANY_ID),
 		.revn  = 320,
 		.name  = "A320",
 		.pm4fw = "a300_pm4.fw",
 		.pfpfw = "a300_pfp.fw",
 		.gmem  = SZ_512K,
 	}, {
 		.rev   = ADRENO_REV(3, 3, 0, ANY_ID),
 		.revn  = 330,
 		.name  = "A330",
 		.pm4fw = "a330_pm4.fw",
 		.pfpfw = "a330_pfp.fw",
 		.gmem  = SZ_1M,
 	},
 };

 MODULE_FIRMWARE("a300_pm4.fw");
 MODULE_FIRMWARE("a300_pfp.fw");
 MODULE_FIRMWARE("a330_pm4.fw");
 MODULE_FIRMWARE("a330_pfp.fw");

 #define RB_SIZE    SZ_32K
 #define RB_BLKSIZE 16

 int adreno_get_param(struct msm_gpu *gpu, uint32_t param, uint64_t *value)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);

 	switch (param) {
 	case MSM_PARAM_GPU_ID:
 		*value = adreno_gpu->info->revn;
 		return 0;
 	case MSM_PARAM_GMEM_SIZE:
 		*value = adreno_gpu->gmem;
 		return 0;
 	default:
 		DBG("%s: invalid param: %u", gpu->name, param);
 		return -EINVAL;
 	}
 }

 #define rbmemptr(adreno_gpu, member)  \
 	((adreno_gpu)->memptrs_iova + offsetof(struct adreno_rbmemptrs, member))

 int adreno_hw_init(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);

 	DBG("%s", gpu->name);

 	/* Setup REG_CP_RB_CNTL: */
 	gpu_write(gpu, REG_AXXX_CP_RB_CNTL,
 			/* size is log2(quad-words): */
 			AXXX_CP_RB_CNTL_BUFSZ(ilog2(gpu->rb->size / 8)) |
 			AXXX_CP_RB_CNTL_BLKSZ(ilog2(RB_BLKSIZE / 8)));

 	/* Setup ringbuffer address: */
 	gpu_write(gpu, REG_AXXX_CP_RB_BASE, gpu->rb_iova);
 	gpu_write(gpu, REG_AXXX_CP_RB_RPTR_ADDR, rbmemptr(adreno_gpu, rptr));

 	/* Setup scratch/timestamp: */
 	gpu_write(gpu, REG_AXXX_SCRATCH_ADDR, rbmemptr(adreno_gpu, fence));

 	gpu_write(gpu, REG_AXXX_SCRATCH_UMSK, 0x1);

 	return 0;
 }

 static uint32_t get_wptr(struct msm_ringbuffer *ring)
 {
 	return ring->cur - ring->start;
 }

 uint32_t adreno_last_fence(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	return adreno_gpu->memptrs->fence;
 }

 void adreno_recover(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct drm_device *dev = gpu->dev;
 	int ret;

 	gpu->funcs->pm_suspend(gpu);

 	/* reset ringbuffer: */
 	gpu->rb->cur = gpu->rb->start;

 	/* reset completed fence seqno, just discard anything pending: */
 	adreno_gpu->memptrs->fence = gpu->submitted_fence;
 	adreno_gpu->memptrs->rptr  = 0;
 	adreno_gpu->memptrs->wptr  = 0;

 	gpu->funcs->pm_resume(gpu);
 	ret = gpu->funcs->hw_init(gpu);
 	if (ret) {
 		dev_err(dev->dev, "gpu hw init failed: %d\n", ret);
 		/* hmm, oh well? */
 	}
 }

 int adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 		struct msm_file_private *ctx)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct msm_drm_private *priv = gpu->dev->dev_private;
 	struct msm_ringbuffer *ring = gpu->rb;
 	unsigned i, ibs = 0;

 	for (i = 0; i < submit->nr_cmds; i++) {
 		switch (submit->cmd[i].type) {
 		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 			/* ignore IB-targets */
 			break;
 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
 			/* ignore if there has not been a ctx switch: */
 			if (priv->lastctx == ctx)
 				break;
 		case MSM_SUBMIT_CMD_BUF:
 			OUT_PKT3(ring, CP_INDIRECT_BUFFER_PFD, 2);
 			OUT_RING(ring, submit->cmd[i].iova);
 			OUT_RING(ring, submit->cmd[i].size);
 			ibs++;
 			break;
 		}
 	}

 	/* on a320, at least, we seem to need to pad things out to an
 	 * even number of qwords to avoid issue w/ CP hanging on wrap-
 	 * around:
 	 */
 	if (ibs % 2)
 		OUT_PKT2(ring);

 	OUT_PKT0(ring, REG_AXXX_CP_SCRATCH_REG2, 1);
 	OUT_RING(ring, submit->fence);

 	if (adreno_is_a3xx(adreno_gpu)) {
 		/* Flush HLSQ lazy updates to make sure there is nothing
 		 * pending for indirect loads after the timestamp has
 		 * passed:
 		 */
 		OUT_PKT3(ring, CP_EVENT_WRITE, 1);
 		OUT_RING(ring, HLSQ_FLUSH);

 		OUT_PKT3(ring, CP_WAIT_FOR_IDLE, 1);
 		OUT_RING(ring, 0x00000000);
 	}

 	OUT_PKT3(ring, CP_EVENT_WRITE, 3);
 	OUT_RING(ring, CACHE_FLUSH_TS);
 	OUT_RING(ring, rbmemptr(adreno_gpu, fence));
 	OUT_RING(ring, submit->fence);

 	/* we could maybe be clever and only CP_COND_EXEC the interrupt: */
 	OUT_PKT3(ring, CP_INTERRUPT, 1);
 	OUT_RING(ring, 0x80000000);

 #if 0
 	if (adreno_is_a3xx(adreno_gpu)) {
 		/* Dummy set-constant to trigger context rollover */
 		OUT_PKT3(ring, CP_SET_CONSTANT, 2);
 		OUT_RING(ring, CP_REG(REG_A3XX_HLSQ_CL_KERNEL_GROUP_X_REG));
 		OUT_RING(ring, 0x00000000);
 	}
 #endif

 	gpu->funcs->flush(gpu);

 	return 0;
 }

 void adreno_flush(struct msm_gpu *gpu)
 {
 	uint32_t wptr = get_wptr(gpu->rb);

 	/* ensure writes to ringbuffer have hit system memory: */
 	mb();

 	gpu_write(gpu, REG_AXXX_CP_RB_WPTR, wptr);
 }

 void adreno_idle(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	uint32_t rptr, wptr = get_wptr(gpu->rb);
 	unsigned long t;

 	t = jiffies + ADRENO_IDLE_TIMEOUT;

 	/* then wait for CP to drain ringbuffer: */
 	do {
 		rptr = adreno_gpu->memptrs->rptr;
 		if (rptr == wptr)
 			return;
 	} while(time_before(jiffies, t));

 	DRM_ERROR("%s: timeout waiting to drain ringbuffer!\n", gpu->name);

 	/* TODO maybe we need to reset GPU here to recover from hang? */
 }

 #ifdef CONFIG_DEBUG_FS
 void adreno_show(struct msm_gpu *gpu, struct seq_file *m)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);

 	seq_printf(m, "revision: %d (%d.%d.%d.%d)\n",
 			adreno_gpu->info->revn, adreno_gpu->rev.core,
 			adreno_gpu->rev.major, adreno_gpu->rev.minor,
 			adreno_gpu->rev.patchid);

 	seq_printf(m, "fence:    %d/%d\n", adreno_gpu->memptrs->fence,
 			gpu->submitted_fence);
 	seq_printf(m, "rptr:     %d\n", adreno_gpu->memptrs->rptr);
 	seq_printf(m, "wptr:     %d\n", adreno_gpu->memptrs->wptr);
 	seq_printf(m, "rb wptr:  %d\n", get_wptr(gpu->rb));
 }
 #endif

 void adreno_wait_ring(struct msm_gpu *gpu, uint32_t ndwords)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	uint32_t freedwords;
 	unsigned long t = jiffies + ADRENO_IDLE_TIMEOUT;
 	do {
 		uint32_t size = gpu->rb->size / 4;
 		uint32_t wptr = get_wptr(gpu->rb);
 		uint32_t rptr = adreno_gpu->memptrs->rptr;
 		freedwords = (rptr + (size - 1) - wptr) % size;

 		if (time_after(jiffies, t)) {
 			DRM_ERROR("%s: timeout waiting for ringbuffer space\n", gpu->name);
 			break;
 		}
 	} while(freedwords < ndwords);
 }

 static const char *iommu_ports[] = {
 		"gfx3d_user", "gfx3d_priv",
 		"gfx3d1_user", "gfx3d1_priv",
 };

 static inline bool _rev_match(uint8_t entry, uint8_t id)
 {
 	return (entry == ANY_ID) || (entry == id);
 }

 int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 		struct adreno_gpu *gpu, const struct adreno_gpu_funcs *funcs,
 		struct adreno_rev rev)
 {
 	struct msm_mmu *mmu;
 	int i, ret;

 	/* identify gpu: */
 	for (i = 0; i < ARRAY_SIZE(gpulist); i++) {
 		const struct adreno_info *info = &gpulist[i];
 		if (_rev_match(info->rev.core, rev.core) &&
 				_rev_match(info->rev.major, rev.major) &&
 				_rev_match(info->rev.minor, rev.minor) &&
 				_rev_match(info->rev.patchid, rev.patchid)) {
 			gpu->info = info;
 			gpu->revn = info->revn;
 			break;
 		}
 	}

 	if (i == ARRAY_SIZE(gpulist)) {
 		dev_err(drm->dev, "Unknown GPU revision: %u.%u.%u.%u\n",
 				rev.core, rev.major, rev.minor, rev.patchid);
 		return -ENXIO;
 	}

 	DBG("Found GPU: %s (%u.%u.%u.%u)", gpu->info->name,
 			rev.core, rev.major, rev.minor, rev.patchid);

 	gpu->funcs = funcs;
 	gpu->gmem = gpu->info->gmem;
 	gpu->rev = rev;

 	ret = request_firmware(&gpu->pm4, gpu->info->pm4fw, drm->dev);
 	if (ret) {
 		dev_err(drm->dev, "failed to load %s PM4 firmware: %d\n",
 				gpu->info->pm4fw, ret);
 		return ret;
 	}

 	ret = request_firmware(&gpu->pfp, gpu->info->pfpfw, drm->dev);
 	if (ret) {
 		dev_err(drm->dev, "failed to load %s PFP firmware: %d\n",
 				gpu->info->pfpfw, ret);
 		return ret;
 	}

 	ret = msm_gpu_init(drm, pdev, &gpu->base, &funcs->base,
 			gpu->info->name, "kgsl_3d0_reg_memory", "kgsl_3d0_irq",
 			RB_SIZE);
 	if (ret)
 		return ret;

 	mmu = gpu->base.mmu;
 	if (mmu) {
 		ret = mmu->funcs->attach(mmu, iommu_ports,
 				ARRAY_SIZE(iommu_ports));
 		if (ret)
 			return ret;
 	}

 	gpu->memptrs_bo = msm_gem_new(drm, sizeof(*gpu->memptrs),
 			MSM_BO_UNCACHED);
 	if (IS_ERR(gpu->memptrs_bo)) {
 		ret = PTR_ERR(gpu->memptrs_bo);
 		gpu->memptrs_bo = NULL;
 		dev_err(drm->dev, "could not allocate memptrs: %d\n", ret);
 		return ret;
 	}

 	gpu->memptrs = msm_gem_vaddr_locked(gpu->memptrs_bo);
 	if (!gpu->memptrs) {
 		dev_err(drm->dev, "could not vmap memptrs\n");
 		return -ENOMEM;
 	}

 	ret = msm_gem_get_iova_locked(gpu->memptrs_bo, gpu->base.id,
 			&gpu->memptrs_iova);
 	if (ret) {
 		dev_err(drm->dev, "could not map memptrs: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 void adreno_gpu_cleanup(struct adreno_gpu *gpu)
 {
 	if (gpu->memptrs_bo) {
 		if (gpu->memptrs_iova)
 			msm_gem_put_iova(gpu->memptrs_bo, gpu->base.id);
 		drm_gem_object_unreference(gpu->memptrs_bo);
 	}
 	if (gpu->pm4)
 		release_firmware(gpu->pm4);
 	if (gpu->pfp)
 		release_firmware(gpu->pfp);
 	msm_gpu_cleanup(&gpu->base);
 }
	/*
	* 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 "adreno_gpu.h"
	#include "msm_gem.h"
	#include "msm_mmu.h"

	struct adreno_info {
	struct adreno_rev rev;
	uint32_t revn;
	const char *name;
	const char pm4fw, pfpfw;
	uint32_t gmem;
	};

	#define ANY_ID 0xff

	static const struct adreno_info gpulist[] = {
	{
	.rev = ADRENO_REV(3, 0, 5, ANY_ID),
	.revn = 305,
	.name = "A305",
	.pm4fw = "a300_pm4.fw",
	.pfpfw = "a300_pfp.fw",
	.gmem = SZ_256K,
	}, {
	.rev = ADRENO_REV(3, 2, ANY_ID, ANY_ID),
	.revn = 320,
	.name = "A320",
	.pm4fw = "a300_pm4.fw",
	.pfpfw = "a300_pfp.fw",
	.gmem = SZ_512K,
	}, {
	.rev = ADRENO_REV(3, 3, 0, ANY_ID),
	.revn = 330,
	.name = "A330",
	.pm4fw = "a330_pm4.fw",
	.pfpfw = "a330_pfp.fw",
	.gmem = SZ_1M,
	},
	};

	MODULE_FIRMWARE("a300_pm4.fw");
	MODULE_FIRMWARE("a300_pfp.fw");
	MODULE_FIRMWARE("a330_pm4.fw");
	MODULE_FIRMWARE("a330_pfp.fw");

	#define RB_SIZE SZ_32K
	#define RB_BLKSIZE 16

	int adreno_get_param(struct msm_gpu gpu, uint32_t param, uint64_t value)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);

	switch (param) {
	case MSM_PARAM_GPU_ID:
	*value = adreno_gpu->info->revn;
	return 0;
	case MSM_PARAM_GMEM_SIZE:
	*value = adreno_gpu->gmem;
	return 0;
	default:
	DBG("%s: invalid param: %u", gpu->name, param);
	return -EINVAL;
	}
	}

	#define rbmemptr(adreno_gpu, member) \
	((adreno_gpu)->memptrs_iova + offsetof(struct adreno_rbmemptrs, member))

	int adreno_hw_init(struct msm_gpu *gpu)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);

	DBG("%s", gpu->name);

	/* Setup REG_CP_RB_CNTL: */
	gpu_write(gpu, REG_AXXX_CP_RB_CNTL,
	/* size is log2(quad-words): */
	AXXX_CP_RB_CNTL_BUFSZ(ilog2(gpu->rb->size / 8)) \|
	AXXX_CP_RB_CNTL_BLKSZ(ilog2(RB_BLKSIZE / 8)));

	/* Setup ringbuffer address: */
	gpu_write(gpu, REG_AXXX_CP_RB_BASE, gpu->rb_iova);
	gpu_write(gpu, REG_AXXX_CP_RB_RPTR_ADDR, rbmemptr(adreno_gpu, rptr));

	/* Setup scratch/timestamp: */
	gpu_write(gpu, REG_AXXX_SCRATCH_ADDR, rbmemptr(adreno_gpu, fence));

	gpu_write(gpu, REG_AXXX_SCRATCH_UMSK, 0x1);

	return 0;
	}

	static uint32_t get_wptr(struct msm_ringbuffer *ring)
	{
	return ring->cur - ring->start;
	}

	uint32_t adreno_last_fence(struct msm_gpu *gpu)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
	return adreno_gpu->memptrs->fence;
	}

	void adreno_recover(struct msm_gpu *gpu)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
	struct drm_device *dev = gpu->dev;
	int ret;

	gpu->funcs->pm_suspend(gpu);

	/* reset ringbuffer: */
	gpu->rb->cur = gpu->rb->start;

	/* reset completed fence seqno, just discard anything pending: */
	adreno_gpu->memptrs->fence = gpu->submitted_fence;
	adreno_gpu->memptrs->rptr = 0;
	adreno_gpu->memptrs->wptr = 0;

	gpu->funcs->pm_resume(gpu);
	ret = gpu->funcs->hw_init(gpu);
	if (ret) {
	dev_err(dev->dev, "gpu hw init failed: %d\n", ret);
	/* hmm, oh well? */
	}
	}

	int adreno_submit(struct msm_gpu gpu, struct msm_gem_submit submit,
	struct msm_file_private *ctx)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
	struct msm_drm_private *priv = gpu->dev->dev_private;
	struct msm_ringbuffer *ring = gpu->rb;
	unsigned i, ibs = 0;

	for (i = 0; i < submit->nr_cmds; i++) {
	switch (submit->cmd[i].type) {
	case MSM_SUBMIT_CMD_IB_TARGET_BUF:
	/* ignore IB-targets */
	break;
	case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
	/* ignore if there has not been a ctx switch: */
	if (priv->lastctx == ctx)
	break;
	case MSM_SUBMIT_CMD_BUF:
	OUT_PKT3(ring, CP_INDIRECT_BUFFER_PFD, 2);
	OUT_RING(ring, submit->cmd[i].iova);
	OUT_RING(ring, submit->cmd[i].size);
	ibs++;
	break;
	}
	}

	/* on a320, at least, we seem to need to pad things out to an
	* even number of qwords to avoid issue w/ CP hanging on wrap-
	* around:
	*/
	if (ibs % 2)
	OUT_PKT2(ring);

	OUT_PKT0(ring, REG_AXXX_CP_SCRATCH_REG2, 1);
	OUT_RING(ring, submit->fence);

	if (adreno_is_a3xx(adreno_gpu)) {
	/* Flush HLSQ lazy updates to make sure there is nothing
	* pending for indirect loads after the timestamp has
	* passed:
	*/
	OUT_PKT3(ring, CP_EVENT_WRITE, 1);
	OUT_RING(ring, HLSQ_FLUSH);

	OUT_PKT3(ring, CP_WAIT_FOR_IDLE, 1);
	OUT_RING(ring, 0x00000000);
	}

	OUT_PKT3(ring, CP_EVENT_WRITE, 3);
	OUT_RING(ring, CACHE_FLUSH_TS);
	OUT_RING(ring, rbmemptr(adreno_gpu, fence));
	OUT_RING(ring, submit->fence);

	/* we could maybe be clever and only CP_COND_EXEC the interrupt: */
	OUT_PKT3(ring, CP_INTERRUPT, 1);
	OUT_RING(ring, 0x80000000);

	#if 0
	if (adreno_is_a3xx(adreno_gpu)) {
	/* Dummy set-constant to trigger context rollover */
	OUT_PKT3(ring, CP_SET_CONSTANT, 2);
	OUT_RING(ring, CP_REG(REG_A3XX_HLSQ_CL_KERNEL_GROUP_X_REG));
	OUT_RING(ring, 0x00000000);
	}
	#endif

	gpu->funcs->flush(gpu);

	return 0;
	}

	void adreno_flush(struct msm_gpu *gpu)
	{
	uint32_t wptr = get_wptr(gpu->rb);

	/* ensure writes to ringbuffer have hit system memory: */
	mb();

	gpu_write(gpu, REG_AXXX_CP_RB_WPTR, wptr);
	}

	void adreno_idle(struct msm_gpu *gpu)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
	uint32_t rptr, wptr = get_wptr(gpu->rb);
	unsigned long t;

	t = jiffies + ADRENO_IDLE_TIMEOUT;

	/* then wait for CP to drain ringbuffer: */
	do {
	rptr = adreno_gpu->memptrs->rptr;
	if (rptr == wptr)
	return;
	} while(time_before(jiffies, t));

	DRM_ERROR("%s: timeout waiting to drain ringbuffer!\n", gpu->name);

	/* TODO maybe we need to reset GPU here to recover from hang? */
	}

	#ifdef CONFIG_DEBUG_FS
	void adreno_show(struct msm_gpu gpu, struct seq_file m)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);

	seq_printf(m, "revision: %d (%d.%d.%d.%d)\n",
	adreno_gpu->info->revn, adreno_gpu->rev.core,
	adreno_gpu->rev.major, adreno_gpu->rev.minor,
	adreno_gpu->rev.patchid);

	seq_printf(m, "fence: %d/%d\n", adreno_gpu->memptrs->fence,
	gpu->submitted_fence);
	seq_printf(m, "rptr: %d\n", adreno_gpu->memptrs->rptr);
	seq_printf(m, "wptr: %d\n", adreno_gpu->memptrs->wptr);
	seq_printf(m, "rb wptr: %d\n", get_wptr(gpu->rb));
	}
	#endif

	void adreno_wait_ring(struct msm_gpu *gpu, uint32_t ndwords)
	{
	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
	uint32_t freedwords;
	unsigned long t = jiffies + ADRENO_IDLE_TIMEOUT;
	do {
	uint32_t size = gpu->rb->size / 4;
	uint32_t wptr = get_wptr(gpu->rb);
	uint32_t rptr = adreno_gpu->memptrs->rptr;
	freedwords = (rptr + (size - 1) - wptr) % size;

	if (time_after(jiffies, t)) {
	DRM_ERROR("%s: timeout waiting for ringbuffer space\n", gpu->name);
	break;
	}
	} while(freedwords < ndwords);
	}

	static const char *iommu_ports[] = {
	"gfx3d_user", "gfx3d_priv",
	"gfx3d1_user", "gfx3d1_priv",
	};

	static inline bool _rev_match(uint8_t entry, uint8_t id)
	{
	return (entry == ANY_ID) \|\| (entry == id);
	}

	int adreno_gpu_init(struct drm_device drm, struct platform_device pdev,
	struct adreno_gpu gpu, const struct adreno_gpu_funcs funcs,
	struct adreno_rev rev)
	{
	struct msm_mmu *mmu;
	int i, ret;

	/* identify gpu: */
	for (i = 0; i < ARRAY_SIZE(gpulist); i++) {
	const struct adreno_info *info = &gpulist[i];
	if (_rev_match(info->rev.core, rev.core) &&
	_rev_match(info->rev.major, rev.major) &&
	_rev_match(info->rev.minor, rev.minor) &&
	_rev_match(info->rev.patchid, rev.patchid)) {
	gpu->info = info;
	gpu->revn = info->revn;
	break;
	}
	}

	if (i == ARRAY_SIZE(gpulist)) {
	dev_err(drm->dev, "Unknown GPU revision: %u.%u.%u.%u\n",
	rev.core, rev.major, rev.minor, rev.patchid);
	return -ENXIO;
	}

	DBG("Found GPU: %s (%u.%u.%u.%u)", gpu->info->name,
	rev.core, rev.major, rev.minor, rev.patchid);

	gpu->funcs = funcs;
	gpu->gmem = gpu->info->gmem;
	gpu->rev = rev;

	ret = request_firmware(&gpu->pm4, gpu->info->pm4fw, drm->dev);
	if (ret) {
	dev_err(drm->dev, "failed to load %s PM4 firmware: %d\n",
	gpu->info->pm4fw, ret);
	return ret;
	}

	ret = request_firmware(&gpu->pfp, gpu->info->pfpfw, drm->dev);
	if (ret) {
	dev_err(drm->dev, "failed to load %s PFP firmware: %d\n",
	gpu->info->pfpfw, ret);
	return ret;
	}

	ret = msm_gpu_init(drm, pdev, &gpu->base, &funcs->base,
	gpu->info->name, "kgsl_3d0_reg_memory", "kgsl_3d0_irq",
	RB_SIZE);
	if (ret)
	return ret;

	mmu = gpu->base.mmu;
	if (mmu) {
	ret = mmu->funcs->attach(mmu, iommu_ports,
	ARRAY_SIZE(iommu_ports));
	if (ret)
	return ret;
	}

	gpu->memptrs_bo = msm_gem_new(drm, sizeof(*gpu->memptrs),
	MSM_BO_UNCACHED);
	if (IS_ERR(gpu->memptrs_bo)) {
	ret = PTR_ERR(gpu->memptrs_bo);
	gpu->memptrs_bo = NULL;
	dev_err(drm->dev, "could not allocate memptrs: %d\n", ret);
	return ret;
	}

	gpu->memptrs = msm_gem_vaddr_locked(gpu->memptrs_bo);
	if (!gpu->memptrs) {
	dev_err(drm->dev, "could not vmap memptrs\n");
	return -ENOMEM;
	}

	ret = msm_gem_get_iova_locked(gpu->memptrs_bo, gpu->base.id,
	&gpu->memptrs_iova);
	if (ret) {
	dev_err(drm->dev, "could not map memptrs: %d\n", ret);
	return ret;
	}

	return 0;
	}

	void adreno_gpu_cleanup(struct adreno_gpu *gpu)
	{
	if (gpu->memptrs_bo) {
	if (gpu->memptrs_iova)
	msm_gem_put_iova(gpu->memptrs_bo, gpu->base.id);
	drm_gem_object_unreference(gpu->memptrs_bo);
	}
	if (gpu->pm4)
	release_firmware(gpu->pm4);
	if (gpu->pfp)
	release_firmware(gpu->pfp);
	msm_gpu_cleanup(&gpu->base);
	}