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e6599adfad
Previously, vpu->recv_buf and send_buf are forced cast from
void __iomem *tcm. vpu->recv_buf->share_buf is passed to
vpu_ipi_desc.handler(). It's not able to do unaligned access. Otherwise
kernel would crash due to unable to handle kernel paging request.
struct vpu_run {
u32 signaled;
char fw_ver[VPU_FW_VER_LEN];
unsigned int dec_capability;
unsigned int enc_capability;
wait_queue_head_t wq;
};
fw_ver starts at 4 byte boundary. If system enables
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS, strscpy() will do
read_word_at_a_time(), which tries to read 8-byte: *(unsigned long *)addr
vpu_init_ipi_handler() calls strscpy(), which would lead to crash.
vpu_init_ipi_handler() and several other handlers (eg.
vpu_dec_ipi_handler) only do read access to this data, so they can be
const, and we can use memcpy_fromio() to copy the buf to another non iomem
buffer then pass to handler.
Fixes: 85709cbf15 ("media: replace strncpy() by strscpy()")
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
187 lines
5.3 KiB
C
187 lines
5.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2016 MediaTek Inc.
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* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
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*/
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#ifndef _MTK_VPU_H
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#define _MTK_VPU_H
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#include <linux/platform_device.h>
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/**
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* VPU (video processor unit) is a tiny processor controlling video hardware
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* related to video codec, scaling and color format converting.
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* VPU interfaces with other blocks by share memory and interrupt.
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**/
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typedef void (*ipi_handler_t) (const void *data,
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unsigned int len,
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void *priv);
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/**
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* enum ipi_id - the id of inter-processor interrupt
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*
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* @IPI_VPU_INIT: The interrupt from vpu is to notfiy kernel
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* VPU initialization completed.
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* IPI_VPU_INIT is sent from VPU when firmware is
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* loaded. AP doesn't need to send IPI_VPU_INIT
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* command to VPU.
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* For other IPI below, AP should send the request
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* to VPU to trigger the interrupt.
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* @IPI_VDEC_H264: The interrupt from vpu is to notify kernel to
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* handle H264 vidoe decoder job, and vice versa.
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* Decode output format is always MT21 no matter what
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* the input format is.
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* @IPI_VDEC_VP8: The interrupt from is to notify kernel to
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* handle VP8 video decoder job, and vice versa.
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* Decode output format is always MT21 no matter what
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* the input format is.
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* @IPI_VDEC_VP9: The interrupt from vpu is to notify kernel to
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* handle VP9 video decoder job, and vice versa.
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* Decode output format is always MT21 no matter what
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* the input format is.
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* @IPI_VENC_H264: The interrupt from vpu is to notify kernel to
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* handle H264 video encoder job, and vice versa.
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* @IPI_VENC_VP8: The interrupt fro vpu is to notify kernel to
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* handle VP8 video encoder job,, and vice versa.
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* @IPI_MDP: The interrupt from vpu is to notify kernel to
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* handle MDP (Media Data Path) job, and vice versa.
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* @IPI_MAX: The maximum IPI number
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*/
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enum ipi_id {
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IPI_VPU_INIT = 0,
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IPI_VDEC_H264,
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IPI_VDEC_VP8,
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IPI_VDEC_VP9,
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IPI_VENC_H264,
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IPI_VENC_VP8,
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IPI_MDP,
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IPI_MAX,
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};
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/**
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* enum rst_id - reset id to register reset function for VPU watchdog timeout
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*
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* @VPU_RST_ENC: encoder reset id
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* @VPU_RST_DEC: decoder reset id
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* @VPU_RST_MDP: MDP (Media Data Path) reset id
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* @VPU_RST_MAX: maximum reset id
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*/
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enum rst_id {
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VPU_RST_ENC,
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VPU_RST_DEC,
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VPU_RST_MDP,
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VPU_RST_MAX,
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};
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/**
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* vpu_ipi_register - register an ipi function
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*
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* @pdev: VPU platform device
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* @id: IPI ID
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* @handler: IPI handler
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* @name: IPI name
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* @priv: private data for IPI handler
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*
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* Register an ipi function to receive ipi interrupt from VPU.
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*
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* Return: Return 0 if ipi registers successfully, otherwise it is failed.
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*/
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int vpu_ipi_register(struct platform_device *pdev, enum ipi_id id,
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ipi_handler_t handler, const char *name, void *priv);
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/**
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* vpu_ipi_send - send data from AP to vpu.
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*
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* @pdev: VPU platform device
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* @id: IPI ID
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* @buf: the data buffer
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* @len: the data buffer length
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*
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* This function is thread-safe. When this function returns,
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* VPU has received the data and starts the processing.
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* When the processing completes, IPI handler registered
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* by vpu_ipi_register will be called in interrupt context.
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*
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* Return: Return 0 if sending data successfully, otherwise it is failed.
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**/
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int vpu_ipi_send(struct platform_device *pdev,
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enum ipi_id id, void *buf,
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unsigned int len);
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/**
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* vpu_get_plat_device - get VPU's platform device
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*
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* @pdev: the platform device of the module requesting VPU platform
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* device for using VPU API.
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*
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* Return: Return NULL if it is failed.
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* otherwise it is VPU's platform device
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**/
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struct platform_device *vpu_get_plat_device(struct platform_device *pdev);
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/**
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* vpu_wdt_reg_handler - register a VPU watchdog handler
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*
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* @pdev: VPU platform device
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* @vpu_wdt_reset_func: the callback reset function
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* @private_data: the private data for reset function
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* @rst_id: reset id
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*
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* Register a handler performing own tasks when vpu reset by watchdog
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*
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* Return: Return 0 if the handler is added successfully,
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* otherwise it is failed.
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*
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**/
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int vpu_wdt_reg_handler(struct platform_device *pdev,
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void vpu_wdt_reset_func(void *),
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void *priv, enum rst_id id);
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/**
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* vpu_get_vdec_hw_capa - get video decoder hardware capability
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*
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* @pdev: VPU platform device
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*
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* Return: video decoder hardware capability
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**/
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unsigned int vpu_get_vdec_hw_capa(struct platform_device *pdev);
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/**
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* vpu_get_venc_hw_capa - get video encoder hardware capability
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*
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* @pdev: VPU platform device
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*
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* Return: video encoder hardware capability
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**/
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unsigned int vpu_get_venc_hw_capa(struct platform_device *pdev);
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/**
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* vpu_load_firmware - download VPU firmware and boot it
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*
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* @pdev: VPU platform device
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*
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* Return: Return 0 if downloading firmware successfully,
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* otherwise it is failed
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**/
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int vpu_load_firmware(struct platform_device *pdev);
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/**
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* vpu_mapping_dm_addr - Mapping DTCM/DMEM to kernel virtual address
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*
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* @pdev: VPU platform device
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* @dmem_addr: VPU's data memory address
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*
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* Mapping the VPU's DTCM (Data Tightly-Coupled Memory) /
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* DMEM (Data Extended Memory) memory address to
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* kernel virtual address.
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*
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* Return: Return ERR_PTR(-EINVAL) if mapping failed,
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* otherwise the mapped kernel virtual address
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**/
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void *vpu_mapping_dm_addr(struct platform_device *pdev,
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u32 dtcm_dmem_addr);
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#endif /* _MTK_VPU_H */
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