From patchwork Thu May 12 12:19:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shannon Zhao X-Patchwork-Id: 9080171 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id DE1399F1C1 for ; Thu, 12 May 2016 12:22:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BB11F201FE for ; Thu, 12 May 2016 12:22:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 93FBA2010B for ; Thu, 12 May 2016 12:22:56 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1b0pcd-0004RC-1w; Thu, 12 May 2016 12:21:43 +0000 Received: from szxga02-in.huawei.com ([119.145.14.65]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1b0pcZ-00049n-6c for linux-arm-kernel@lists.infradead.org; Thu, 12 May 2016 12:21:41 +0000 Received: from 172.24.1.47 (EHLO SZXEML423-HUB.china.huawei.com) ([172.24.1.47]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DHA63560; Thu, 12 May 2016 20:20:37 +0800 (CST) Received: from HGHY1Z002260041.china.huawei.com (10.177.16.142) by SZXEML423-HUB.china.huawei.com (10.82.67.154) with Microsoft SMTP Server id 14.3.235.1; Thu, 12 May 2016 20:20:27 +0800 From: Shannon Zhao To: , Subject: [PATCH v2] Xen: EFI: Parse DT parameters for Xen specific UEFI Date: Thu, 12 May 2016 20:19:54 +0800 Message-ID: <1463055594-14980-1-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 MIME-Version: 1.0 X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.57347517.0098, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 1716a7499ee2e45ffae90407295fed23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160512_052139_874707_92CCD60A X-CRM114-Status: GOOD ( 21.25 ) X-Spam-Score: -5.6 (-----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, peter.huangpeng@huawei.com, sstabellini@kernel.org, shannon.zhao@linaro.org, xen-devel@lists.xen.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Shannon Zhao The EFI DT parameters for bare metal are located under /chosen node, while for Xen Dom0 they are located under /hyperviosr/uefi node. These parameters under /chosen and /hyperviosr/uefi are not expected to appear at the same time. Parse these EFI parameters and initialize EFI like the way for bare metal except the runtime services because the runtime services for Xen Dom0 are available through hypercalls and they are always enabled. So it sets the EFI_RUNTIME_SERVICES flag if it finds /hyperviosr/uefi node and bails out in arm_enable_runtime_services() when EFI_RUNTIME_SERVICES flag is set already. CC: Matt Fleming Signed-off-by: Shannon Zhao --- v2: rebase it on top of EFI and Xen next branch, add some comments to explain the codes. --- arch/arm/xen/enlighten.c | 22 +++++++++++ drivers/firmware/efi/arm-runtime.c | 5 +++ drivers/firmware/efi/efi.c | 81 ++++++++++++++++++++++++++++++-------- 3 files changed, 92 insertions(+), 16 deletions(-) diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 13e3e9f..d4f36eb 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -15,7 +15,9 @@ #include #include #include +#include #include +#include #include #include #include @@ -261,6 +263,19 @@ static int __init fdt_find_hyper_node(unsigned long node, const char *uname, !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix))) hyper_node.version = s + strlen(hyper_node.prefix); + /* + * Check if Xen supports EFI by checking whether there is the + * "/hypervisor/uefi" node in DT. If so, runtime services are available + * through proxy functions (e.g. in case of Xen dom0 EFI implementation + * they call special hypercall which executes relevant EFI functions) + * and that is why they are always enabled. + */ + if (IS_ENABLED(CONFIG_XEN_EFI)) { + if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) && + !efi_runtime_disabled()) + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); + } + return 0; } @@ -352,6 +367,13 @@ static int __init xen_guest_init(void) return -ENODEV; } + /* + * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI + * parameters are found. Force enable runtime services. + */ + if (efi_enabled(EFI_RUNTIME_SERVICES)) + xen_efi_runtime_setup(); + shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); if (!shared_info_page) { diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c index 17ccf0a..c394b81 100644 --- a/drivers/firmware/efi/arm-runtime.c +++ b/drivers/firmware/efi/arm-runtime.c @@ -107,6 +107,11 @@ static int __init arm_enable_runtime_services(void) return 0; } + if (efi_enabled(EFI_RUNTIME_SERVICES)) { + pr_info("EFI runtime services access via paravirt.\n"); + return 0; + } + pr_info("Remapping and enabling EFI services.\n"); mapsize = efi.memmap.map_end - efi.memmap.map; diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 05509f3..1c6f9dd 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -472,12 +472,14 @@ device_initcall(efi_load_efivars); FIELD_SIZEOF(struct efi_fdt_params, field) \ } -static __initdata struct { +struct params { const char name[32]; const char propname[32]; int offset; int size; -} dt_params[] = { +}; + +static __initdata struct params fdt_params[] = { UEFI_PARAM("System Table", "linux,uefi-system-table", system_table), UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap), UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size), @@ -485,44 +487,91 @@ static __initdata struct { UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) }; +static __initdata struct params xen_fdt_params[] = { + UEFI_PARAM("System Table", "xen,uefi-system-table", system_table), + UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap), + UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size), + UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size), + UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver) +}; + +#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) + +static __initdata struct { + const char *uname; + const char *subnode; + struct params *params; +} dt_params[] = { + { "hypervisor", "uefi", xen_fdt_params }, + { "chosen", NULL, fdt_params }, +}; + struct param_info { int found; void *params; + const char *missing; }; -static int __init fdt_find_uefi_params(unsigned long node, const char *uname, - int depth, void *data) +static int __init __find_uefi_params(unsigned long node, + struct param_info *info, + struct params *params) { - struct param_info *info = data; const void *prop; void *dest; u64 val; int i, len; - if (depth != 1 || strcmp(uname, "chosen") != 0) - return 0; - - for (i = 0; i < ARRAY_SIZE(dt_params); i++) { - prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len); - if (!prop) + for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { + prop = of_get_flat_dt_prop(node, params[i].propname, &len); + if (!prop) { + info->missing = params[i].name; return 0; - dest = info->params + dt_params[i].offset; + } + + dest = info->params + params[i].offset; info->found++; val = of_read_number(prop, len / sizeof(u32)); - if (dt_params[i].size == sizeof(u32)) + if (params[i].size == sizeof(u32)) *(u32 *)dest = val; else *(u64 *)dest = val; if (efi_enabled(EFI_DBG)) - pr_info(" %s: 0x%0*llx\n", dt_params[i].name, - dt_params[i].size * 2, val); + pr_info(" %s: 0x%0*llx\n", params[i].name, + params[i].size * 2, val); } + return 1; } +static int __init fdt_find_uefi_params(unsigned long node, const char *uname, + int depth, void *data) +{ + struct param_info *info = data; + int i; + + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { + const char *subnode = dt_params[i].subnode; + + if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { + info->missing = dt_params[i].params[0].name; + continue; + } + + if (subnode) { + node = of_get_flat_dt_subnode_by_name(node, subnode); + if (node < 0) + return 0; + } + + return __find_uefi_params(node, info, dt_params[i].params); + } + + return 0; +} + int __init efi_get_fdt_params(struct efi_fdt_params *params) { struct param_info info; @@ -538,7 +587,7 @@ int __init efi_get_fdt_params(struct efi_fdt_params *params) pr_info("UEFI not found.\n"); else if (!ret) pr_err("Can't find '%s' in device tree!\n", - dt_params[info.found].name); + info.missing); return ret; }