Commit 24898f5e authored by AngeloGioacchino Del Regno's avatar AngeloGioacchino Del Regno Committed by ZhangPeng
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remoteproc: mediatek: Make sure IPI buffer fits in L2TCM 

stable inclusion
from stable-v6.6.32
commit 26c6d7dc8c6a9fde9d362ab2eef6390efeff145e
bugzilla: https://gitee.com/openeuler/kernel/issues/IA4MGD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=26c6d7dc8c6a9fde9d362ab2eef6390efeff145e



--------------------------------

commit 331f91d86f71d0bb89a44217cc0b2a22810bbd42 upstream.

The IPI buffer location is read from the firmware that we load to the
System Companion Processor, and it's not granted that both the SRAM
(L2TCM) size that is defined in the devicetree node is large enough
for that, and while this is especially true for multi-core SCP, it's
still useful to check on single-core variants as well.

Failing to perform this check may make this driver perform R/W
operations out of the L2TCM boundary, resulting (at best) in a
kernel panic.

To fix that, check that the IPI buffer fits, otherwise return a
failure and refuse to boot the relevant SCP core (or the SCP at
all, if this is single core).

Fixes: 3efa0ea7 ("remoteproc/mediatek: read IPI buffer offset from FW")
Signed-off-by: default avatarAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240321084614.45253-2-angelogioacchino.delregno@collabora.com


Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarZhangPeng <zhangpeng362@huawei.com>
parent 6b600793

drivers/remoteproc/mtk_scp.c

+9 −1
Original line number Diff line number Diff line
@@ -126,7 +126,7 @@ static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp, 
static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw)

{

	int ret;

	size_t offset;

	size_t buf_sz, offset;



	/* read the ipi buf addr from FW itself first */

	ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset);
@@ -138,6 +138,14 @@ static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw) 
	}

	dev_info(scp->dev, "IPI buf addr %#010zx\n", offset);



	/* Make sure IPI buffer fits in the L2TCM range assigned to this core */

	buf_sz = sizeof(*scp->recv_buf) + sizeof(*scp->send_buf);



	if (scp->sram_size < buf_sz + offset) {

		dev_err(scp->dev, "IPI buffer does not fit in SRAM.\n");

		return -EOVERFLOW;

	}



	scp->recv_buf = (struct mtk_share_obj __iomem *)

			(scp->sram_base + offset);

	scp->send_buf = (struct mtk_share_obj __iomem *)