From patchwork Mon Dec 28 03:08:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KuoHsiang Chou X-Patchwork-Id: 11990825 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8006DC433DB for ; Mon, 28 Dec 2020 03:08:41 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 38C31207D2 for ; Mon, 28 Dec 2020 03:08:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 38C31207D2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=aspeedtech.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ADC1A898F5; Mon, 28 Dec 2020 03:08:40 +0000 (UTC) Received: from twspam01.aspeedtech.com (twspam01.aspeedtech.com [211.20.114.71]) by gabe.freedesktop.org (Postfix) with ESMTPS id 09F77898F5 for ; Mon, 28 Dec 2020 03:08:39 +0000 (UTC) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 0BS34TRg024144; Mon, 28 Dec 2020 11:04:29 +0800 (GMT-8) (envelope-from kuohsiang_chou@aspeedtech.com) Received: from localhost.localdomain.com (192.168.2.206) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Dec 2020 11:08:30 +0800 From: KuoHsiang Chou To: , , Subject: [PATCH V3] drm/ast: Fixed CVE for DP501 Date: Mon, 28 Dec 2020 11:08:23 +0800 Message-ID: <20201228030823.294147-1-kuohsiang_chou@aspeedtech.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <202012120256.nX6SgoRT-lkp@intel.com> References: <202012120256.nX6SgoRT-lkp@intel.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.206] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 0BS34TRg024144 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, tommy_huang@aspeedtech.com, jenmin_yuan@aspeedtech.com, airlied@redhat.com, arc_sung@aspeedtech.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" [Bug][DP501] If ASPEED P2A (PCI to AHB) bridge is disabled and disallowed for CVE_2019_6260 item3, and then the monitor's EDID is unable read through Parade DP501. The reason is the DP501's FW is mapped to BMC addressing space rather than Host addressing space. The resolution is that using "pci_iomap_range()" maps to DP501's FW that stored on the end of FB (Frame Buffer). 0In this case, FrameBuffer reserves the last 2MB used for the image of DP501. Signed-off-by: KuoHsiang Chou Reported-by: kernel test robot --- drivers/gpu/drm/ast/ast_dp501.c | 139 +++++++++++++++++++++++--------- drivers/gpu/drm/ast/ast_drv.h | 12 +++ drivers/gpu/drm/ast/ast_main.c | 8 ++ 3 files changed, 123 insertions(+), 36 deletions(-) -- 2.18.4 diff --git a/drivers/gpu/drm/ast/ast_dp501.c b/drivers/gpu/drm/ast/ast_dp501.c index 88121c0e0d05..cd93c44f2662 100644 --- a/drivers/gpu/drm/ast/ast_dp501.c +++ b/drivers/gpu/drm/ast/ast_dp501.c @@ -189,6 +189,9 @@ bool ast_backup_fw(struct drm_device *dev, u8 *addr, u32 size) u32 i, data; u32 boot_address; + if (ast->config_mode != ast_use_p2a) + return false; + data = ast_mindwm(ast, 0x1e6e2100) & 0x01; if (data) { boot_address = get_fw_base(ast); @@ -207,6 +210,9 @@ static bool ast_launch_m68k(struct drm_device *dev) u8 *fw_addr = NULL; u8 jreg; + if (ast->config_mode != ast_use_p2a) + return false; + data = ast_mindwm(ast, 0x1e6e2100) & 0x01; if (!data) { @@ -271,25 +277,55 @@ u8 ast_get_dp501_max_clk(struct drm_device *dev) struct ast_private *ast = to_ast_private(dev); u32 boot_address, offset, data; u8 linkcap[4], linkrate, linklanes, maxclk = 0xff; + u32 *plinkcap; - boot_address = get_fw_base(ast); - - /* validate FW version */ - offset = 0xf000; - data = ast_mindwm(ast, boot_address + offset); - if ((data & 0xf0) != 0x10) /* version: 1x */ - return maxclk; - - /* Read Link Capability */ - offset = 0xf014; - *(u32 *)linkcap = ast_mindwm(ast, boot_address + offset); - if (linkcap[2] == 0) { - linkrate = linkcap[0]; - linklanes = linkcap[1]; - data = (linkrate == 0x0a) ? (90 * linklanes) : (54 * linklanes); - if (data > 0xff) - data = 0xff; - maxclk = (u8)data; + if (ast->config_mode == ast_use_p2a) { + boot_address = get_fw_base(ast); + + /* validate FW version */ + offset = AST_DP501_GBL_VERSION; + data = ast_mindwm(ast, boot_address + offset); + if ((data & AST_DP501_FW_VERSION_MASK) != AST_DP501_FW_VERSION_1) /* version: 1x */ + return maxclk; + + /* Read Link Capability */ + offset = AST_DP501_LINKRATE; + plinkcap = (u32 *)linkcap; + *plinkcap = ast_mindwm(ast, boot_address + offset); + if (linkcap[2] == 0) { + linkrate = linkcap[0]; + linklanes = linkcap[1]; + data = (linkrate == 0x0a) ? (90 * linklanes) : (54 * linklanes); + if (data > 0xff) + data = 0xff; + maxclk = (u8)data; + } + } else { + if (!ast->dp501_fw_buf) + return AST_DP501_DEFAULT_DCLK; /* 1024x768 as default */ + + /* dummy read */ + offset = 0x0000; + data = readl(ast->dp501_fw_buf + offset); + + /* validate FW version */ + offset = AST_DP501_GBL_VERSION; + data = readl(ast->dp501_fw_buf + offset); + if ((data & AST_DP501_FW_VERSION_MASK) != AST_DP501_FW_VERSION_1) /* version: 1x */ + return maxclk; + + /* Read Link Capability */ + offset = AST_DP501_LINKRATE; + plinkcap = (u32 *)linkcap; + *plinkcap = readl(ast->dp501_fw_buf + offset); + if (linkcap[2] == 0) { + linkrate = linkcap[0]; + linklanes = linkcap[1]; + data = (linkrate == 0x0a) ? (90 * linklanes) : (54 * linklanes); + if (data > 0xff) + data = 0xff; + maxclk = (u8)data; + } } return maxclk; } @@ -298,26 +334,57 @@ bool ast_dp501_read_edid(struct drm_device *dev, u8 *ediddata) { struct ast_private *ast = to_ast_private(dev); u32 i, boot_address, offset, data; + u32 *pEDIDidx; - boot_address = get_fw_base(ast); - - /* validate FW version */ - offset = 0xf000; - data = ast_mindwm(ast, boot_address + offset); - if ((data & 0xf0) != 0x10) - return false; - - /* validate PnP Monitor */ - offset = 0xf010; - data = ast_mindwm(ast, boot_address + offset); - if (!(data & 0x01)) - return false; + if (ast->config_mode == ast_use_p2a) { + boot_address = get_fw_base(ast); - /* Read EDID */ - offset = 0xf020; - for (i = 0; i < 128; i += 4) { - data = ast_mindwm(ast, boot_address + offset + i); - *(u32 *)(ediddata + i) = data; + /* validate FW version */ + offset = AST_DP501_GBL_VERSION; + data = ast_mindwm(ast, boot_address + offset); + if ((data & AST_DP501_FW_VERSION_MASK) != AST_DP501_FW_VERSION_1) + return false; + + /* validate PnP Monitor */ + offset = AST_DP501_PNPMONITOR; + data = ast_mindwm(ast, boot_address + offset); + if (!(data & AST_DP501_PNP_CONNECTED)) + return false; + + /* Read EDID */ + offset = AST_DP501_EDID_DATA; + for (i = 0; i < 128; i += 4) { + data = ast_mindwm(ast, boot_address + offset + i); + pEDIDidx = (u32 *)(ediddata + i); + *pEDIDidx = data; + } + } else { + if (!ast->dp501_fw_buf) + return false; + + /* dummy read */ + offset = 0x0000; + data = readl(ast->dp501_fw_buf + offset); + + /* validate FW version */ + offset = AST_DP501_GBL_VERSION; + data = readl(ast->dp501_fw_buf + offset); + if ((data & AST_DP501_FW_VERSION_MASK) != AST_DP501_FW_VERSION_1) + return false; + + /* validate PnP Monitor */ + offset = AST_DP501_PNPMONITOR; + data = readl(ast->dp501_fw_buf + offset); + if (!(data & AST_DP501_PNP_CONNECTED)) + return false; + + /* Read EDID */ + offset = AST_DP501_EDID_DATA; + for (i = 0; i < 128; i += 4) { + data = readl(ast->dp501_fw_buf + offset + i); + pEDIDidx = (u32 *)(ediddata + i); + *pEDIDidx = data; + } } return true; diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h index 6b9e3b94a712..da6dfb677540 100644 --- a/drivers/gpu/drm/ast/ast_drv.h +++ b/drivers/gpu/drm/ast/ast_drv.h @@ -121,6 +121,7 @@ struct ast_private { void __iomem *regs; void __iomem *ioregs; + void __iomem *dp501_fw_buf; enum ast_chip chip; bool vga2_clone; @@ -299,6 +300,17 @@ int ast_mode_config_init(struct ast_private *ast); #define AST_MM_ALIGN_SHIFT 4 #define AST_MM_ALIGN_MASK ((1 << AST_MM_ALIGN_SHIFT) - 1) +#define AST_DP501_FW_VERSION_MASK GENMASK(7, 4) +#define AST_DP501_FW_VERSION_1 BIT(4) +#define AST_DP501_PNP_CONNECTED BIT(1) + +#define AST_DP501_DEFAULT_DCLK 65 + +#define AST_DP501_GBL_VERSION 0xf000 +#define AST_DP501_PNPMONITOR 0xf010 +#define AST_DP501_LINKRATE 0xf014 +#define AST_DP501_EDID_DATA 0xf020 + int ast_mm_init(struct ast_private *ast); /* ast post */ diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index 4ec6884f6c65..3775fe26f792 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -449,6 +449,14 @@ struct ast_private *ast_device_create(struct drm_driver *drv, if (ret) return ERR_PTR(ret); + /* map reserved buffer */ + ast->dp501_fw_buf = NULL; + if (dev->vram_mm->vram_size < pci_resource_len(dev->pdev, 0)) { + ast->dp501_fw_buf = pci_iomap_range(dev->pdev, 0, dev->vram_mm->vram_size, 0); + if (!ast->dp501_fw_buf) + drm_info(dev, "failed to map reserved buffer!\n"); + } + ret = ast_mode_config_init(ast); if (ret) return ERR_PTR(ret);