forked from Minki/linux
7c65817e6d
The A5XX GPU powers on in "secure" mode. In secure mode the GPU can only render to buffers that are marked as secure and inaccessible to the kernel and user through a series of hardware protections. In practice secure mode is used to draw things like a UI on a secure video frame. In order to switch out of secure mode the GPU executes a special shader that clears out the GMEM and other sensitve registers and then writes a register. Because the kernel can't be trusted the shader binary is signed and verified and programmed by the secure world. To do this we need to read the MDT header and the segments from the firmware location and put them in memory and present them for approval. For targets without secure support there is an out: if the secure world doesn't support secure then there are no hardware protections and we can freely write the SECVID_TRUST register from the CPU. We don't have 100% confidence that we can query the secure capabilities at run time but we have enough calls that need to go right to give us some confidence that we're at least doing something useful. Of course if we guess wrong you trigger a permissions violation which usually ends up in a system crash but thats a problem that shows up immediately. [v2: use child device per Bjorn] [v3: use generic MDT loader per Bjorn] [v4: use managed dma functions and ifdefs for the MDT loader] [v5: Add depends for QCOM_MDT_LOADER] Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> [robclark: fix Kconfig to use select instead of depends + #if IS_ENABLED()] Signed-off-by: Rob Clark <robdclark@gmail.com>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* Copyright (c) 2016 The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only 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.
|
|
*
|
|
*/
|
|
#ifndef __A5XX_GPU_H__
|
|
#define __A5XX_GPU_H__
|
|
|
|
#include "adreno_gpu.h"
|
|
|
|
/* Bringing over the hack from the previous targets */
|
|
#undef ROP_COPY
|
|
#undef ROP_XOR
|
|
|
|
#include "a5xx.xml.h"
|
|
|
|
struct a5xx_gpu {
|
|
struct adreno_gpu base;
|
|
struct platform_device *pdev;
|
|
|
|
struct drm_gem_object *pm4_bo;
|
|
uint64_t pm4_iova;
|
|
|
|
struct drm_gem_object *pfp_bo;
|
|
uint64_t pfp_iova;
|
|
|
|
struct drm_gem_object *gpmu_bo;
|
|
uint64_t gpmu_iova;
|
|
uint32_t gpmu_dwords;
|
|
|
|
uint32_t lm_leakage;
|
|
|
|
struct device zap_dev;
|
|
};
|
|
|
|
#define to_a5xx_gpu(x) container_of(x, struct a5xx_gpu, base)
|
|
|
|
int a5xx_power_init(struct msm_gpu *gpu);
|
|
void a5xx_gpmu_ucode_init(struct msm_gpu *gpu);
|
|
|
|
static inline int spin_usecs(struct msm_gpu *gpu, uint32_t usecs,
|
|
uint32_t reg, uint32_t mask, uint32_t value)
|
|
{
|
|
while (usecs--) {
|
|
udelay(1);
|
|
if ((gpu_read(gpu, reg) & mask) == value)
|
|
return 0;
|
|
cpu_relax();
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
|
|
#endif /* __A5XX_GPU_H__ */
|