From patchwork Thu Mar 21 08:46:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 13598511 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ED486CD11DB for ; Thu, 21 Mar 2024 08:46:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=na1+axs6LXQl6b2jFl03w7Z4rVYB4S1t8myK3eDeCqI=; b=3J8Nx0pVFmhiTd c5BJTvjg1RhA0sInvKqqMZsJTvNxTEY2IaOLLzUU4+8Nm0Jdk65ZrawKCN8qWWtw090ihsryYlwPR R2gcxG91CvVx8pVAlhxmWoTqUvsl7yB5sQWkMtVoy1s7oJElcRlpZNQshgarHOgdD/lUHYxiuWkrI iEn8NRv0gM70GZcbeqHL+M/9HJgQrDtpona+TtZqIOrbyIizN6be7FMUXogw097eo11CarugyfGrU J4FWqSsYwSc8XIMGqp+Z0/RVnt0h/NiWbLbQtUJzFg7XEJKVQUC+bnJ6FxCkS/O9ilA+NDlUm7oSa 1xrwPK2PUlHhZbGEkC8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rnE4M-00000002N48-0vLK; Thu, 21 Mar 2024 08:46:38 +0000 Received: from madrid.collaboradmins.com ([2a00:1098:ed:100::25]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rnE4H-00000002N1h-3UjL; Thu, 21 Mar 2024 08:46:35 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1711010792; bh=NqcCQoYTi7w39yHeqdyYgH/AKTtHB2Xu9qukGQne7yA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1fp7acZmBXCpRsY5BNXvVpvO/H+tZY7F6WB7B0Qay39vTKhh+BKJF42sh6kdvM8aE F913/i597FGqp+xvQvdVzofeVzjSbaAD4PP9kokEPNlGsWgYNX6oz0117rxvXMVZEY LV/bUVKfAavpu+/JbLjWUM8ftpCGKYDXvxwddipwPA+r+NUvabFVgiHlQowucYj9Rh lEbMZ+A53zFJW7skNmG5nFKMqVwvW5oeCyeftgV5lL8BkedpG1B8dl1dl1JEhboy/z m1HY1blLw+mw7PhAuz25pFgj9j0NnjP4Exx8VrBAMDHTNkeG/OYNjxhQ0bMyw/WqrS Co0oCbYYS2axw== Received: from IcarusMOD.eternityproject.eu (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madrid.collaboradmins.com (Postfix) with ESMTPSA id A31E137820EF; Thu, 21 Mar 2024 08:46:31 +0000 (UTC) From: AngeloGioacchino Del Regno To: mathieu.poirier@linaro.org Cc: andersson@kernel.org, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, tzungbi@kernel.org, tinghan.shen@mediatek.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, wenst@chromium.org, kernel@collabora.com Subject: [PATCH 1/2] remoteproc: mediatek: Make sure IPI buffer fits in L2TCM Date: Thu, 21 Mar 2024 09:46:13 +0100 Message-ID: <20240321084614.45253-2-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240321084614.45253-1-angelogioacchino.delregno@collabora.com> References: <20240321084614.45253-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240321_014634_033394_32237C17 X-CRM114-Status: GOOD ( 15.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 oeprations 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: 3efa0ea743b7 ("remoteproc/mediatek: read IPI buffer offset from FW") Signed-off-by: AngeloGioacchino Del Regno Reviewed-by: Tzung-Bi Shih --- drivers/remoteproc/mtk_scp.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c index a35409eda0cf..67518291a8ad 100644 --- a/drivers/remoteproc/mtk_scp.c +++ b/drivers/remoteproc/mtk_scp.c @@ -132,7 +132,7 @@ 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); @@ -144,6 +144,14 @@ 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 *)