mirror of
https://github.com/torvalds/linux
synced 2024-10-21 10:49:43 +00:00
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>
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015-2016 MediaTek Inc.
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* Author: Houlong Wei <houlong.wei@mediatek.com>
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* Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
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*/
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#include "mtk_mdp_core.h"
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#include "mtk_mdp_vpu.h"
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#include "mtk_vpu.h"
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static inline struct mtk_mdp_ctx *vpu_to_ctx(struct mtk_mdp_vpu *vpu)
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{
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return container_of(vpu, struct mtk_mdp_ctx, vpu);
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}
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static void mtk_mdp_vpu_handle_init_ack(const struct mdp_ipi_comm_ack *msg)
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{
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struct mtk_mdp_vpu *vpu = (struct mtk_mdp_vpu *)
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(unsigned long)msg->ap_inst;
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/* mapping VPU address to kernel virtual address */
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vpu->vsi = (struct mdp_process_vsi *)
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vpu_mapping_dm_addr(vpu->pdev, msg->vpu_inst_addr);
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vpu->inst_addr = msg->vpu_inst_addr;
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}
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static void mtk_mdp_vpu_ipi_handler(const void *data, unsigned int len,
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void *priv)
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{
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const struct mdp_ipi_comm_ack *msg = data;
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unsigned int msg_id = msg->msg_id;
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struct mtk_mdp_vpu *vpu = (struct mtk_mdp_vpu *)
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(unsigned long)msg->ap_inst;
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struct mtk_mdp_ctx *ctx;
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vpu->failure = msg->status;
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if (!vpu->failure) {
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switch (msg_id) {
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case VPU_MDP_INIT_ACK:
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mtk_mdp_vpu_handle_init_ack(data);
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break;
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case VPU_MDP_DEINIT_ACK:
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case VPU_MDP_PROCESS_ACK:
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break;
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default:
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ctx = vpu_to_ctx(vpu);
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dev_err(&ctx->mdp_dev->pdev->dev,
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"handle unknown ipi msg:0x%x\n",
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msg_id);
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break;
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}
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} else {
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ctx = vpu_to_ctx(vpu);
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mtk_mdp_dbg(0, "[%d]:msg 0x%x, failure:%d", ctx->id,
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msg_id, vpu->failure);
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}
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}
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int mtk_mdp_vpu_register(struct platform_device *pdev)
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{
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struct mtk_mdp_dev *mdp = platform_get_drvdata(pdev);
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int err;
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err = vpu_ipi_register(mdp->vpu_dev, IPI_MDP,
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mtk_mdp_vpu_ipi_handler, "mdp_vpu", NULL);
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if (err)
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dev_err(&mdp->pdev->dev,
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"vpu_ipi_registration fail status=%d\n", err);
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return err;
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}
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static int mtk_mdp_vpu_send_msg(void *msg, int len, struct mtk_mdp_vpu *vpu,
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int id)
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{
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struct mtk_mdp_ctx *ctx = vpu_to_ctx(vpu);
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int err;
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if (!vpu->pdev) {
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mtk_mdp_dbg(1, "[%d]:vpu pdev is NULL", ctx->id);
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return -EINVAL;
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}
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mutex_lock(&ctx->mdp_dev->vpulock);
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err = vpu_ipi_send(vpu->pdev, (enum ipi_id)id, msg, len);
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if (err)
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dev_err(&ctx->mdp_dev->pdev->dev,
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"vpu_ipi_send fail status %d\n", err);
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mutex_unlock(&ctx->mdp_dev->vpulock);
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return err;
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}
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static int mtk_mdp_vpu_send_ap_ipi(struct mtk_mdp_vpu *vpu, uint32_t msg_id)
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{
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int err;
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struct mdp_ipi_comm msg;
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msg.msg_id = msg_id;
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msg.ipi_id = IPI_MDP;
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msg.vpu_inst_addr = vpu->inst_addr;
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msg.ap_inst = (unsigned long)vpu;
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err = mtk_mdp_vpu_send_msg((void *)&msg, sizeof(msg), vpu, IPI_MDP);
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if (!err && vpu->failure)
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err = -EINVAL;
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return err;
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}
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int mtk_mdp_vpu_init(struct mtk_mdp_vpu *vpu)
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{
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int err;
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struct mdp_ipi_init msg;
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struct mtk_mdp_ctx *ctx = vpu_to_ctx(vpu);
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vpu->pdev = ctx->mdp_dev->vpu_dev;
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msg.msg_id = AP_MDP_INIT;
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msg.ipi_id = IPI_MDP;
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msg.ap_inst = (unsigned long)vpu;
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err = mtk_mdp_vpu_send_msg((void *)&msg, sizeof(msg), vpu, IPI_MDP);
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if (!err && vpu->failure)
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err = -EINVAL;
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return err;
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}
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int mtk_mdp_vpu_deinit(struct mtk_mdp_vpu *vpu)
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{
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return mtk_mdp_vpu_send_ap_ipi(vpu, AP_MDP_DEINIT);
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}
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int mtk_mdp_vpu_process(struct mtk_mdp_vpu *vpu)
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{
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return mtk_mdp_vpu_send_ap_ipi(vpu, AP_MDP_PROCESS);
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}
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