Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757729AbcCXOsU (ORCPT ); Thu, 24 Mar 2016 10:48:20 -0400 Received: from mail-pf0-f170.google.com ([209.85.192.170]:32978 "EHLO mail-pf0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757536AbcCXOrv (ORCPT ); Thu, 24 Mar 2016 10:47:51 -0400 From: Shannon Zhao To: linux-arm-kernel@lists.infradead.org, stefano.stabellini@citrix.com, david.vrabel@citrix.com Cc: devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, julien.grall@arm.com, peter.huangpeng@huawei.com, xen-devel@lists.xen.org, zhaoshenglong@huawei.com, shannon.zhao@linaro.org Subject: [PATCH v7 11/17] ARM: XEN: Move xen_early_init() before efi_init() Date: Thu, 24 Mar 2016 22:44:30 +0800 Message-Id: <1458830676-27075-12-git-send-email-shannon.zhao@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1458830676-27075-1-git-send-email-shannon.zhao@linaro.org> References: <1458830676-27075-1-git-send-email-shannon.zhao@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3845 Lines: 136 Move xen_early_init() before efi_init(), then when calling efi_init() could initialize Xen specific UEFI. Check if it runs on Xen hypervisor through the flat dts. Signed-off-by: Shannon Zhao Reviewed-by: Stefano Stabellini --- arch/arm/xen/enlighten.c | 56 ++++++++++++++++++++++++++++++++++------------- arch/arm64/kernel/setup.c | 2 +- 2 files changed, 42 insertions(+), 16 deletions(-) diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 680aae0..c43617f 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -53,8 +54,6 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; static __read_mostly unsigned int xen_events_irq; -static __initdata struct device_node *xen_node; - int xen_remap_domain_gfn_array(struct vm_area_struct *vma, unsigned long addr, xen_pfn_t *gfn, int nr, @@ -238,6 +237,33 @@ static irqreturn_t xen_arm_callback(int irq, void *arg) return IRQ_HANDLED; } +static __initdata struct { + const char *compat; + const char *prefix; + const char *version; + bool found; +} hyper_node = {"xen,xen", "xen,xen-", NULL, false}; + +static int __init fdt_find_hyper_node(unsigned long node, const char *uname, + int depth, void *data) +{ + const void *s = NULL; + int len; + + if (depth != 1 || strcmp(uname, "hypervisor") != 0) + return 0; + + if (of_flat_dt_is_compatible(node, hyper_node.compat)) + hyper_node.found = true; + + s = of_get_flat_dt_prop(node, "compatible", &len); + if (strlen(hyper_node.prefix) + 3 < len && + !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix))) + hyper_node.version = s + strlen(hyper_node.prefix); + + return 0; +} + /* * see Documentation/devicetree/bindings/arm/xen.txt for the * documentation of the Xen Device Tree format. @@ -245,26 +271,18 @@ static irqreturn_t xen_arm_callback(int irq, void *arg) #define GRANT_TABLE_PHYSADDR 0 void __init xen_early_init(void) { - int len; - const char *s = NULL; - const char *version = NULL; - const char *xen_prefix = "xen,xen-"; - - xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); - if (!xen_node) { + of_scan_flat_dt(fdt_find_hyper_node, NULL); + if (!hyper_node.found) { pr_debug("No Xen support\n"); return; } - s = of_get_property(xen_node, "compatible", &len); - if (strlen(xen_prefix) + 3 < len && - !strncmp(xen_prefix, s, strlen(xen_prefix))) - version = s + strlen(xen_prefix); - if (version == NULL) { + + if (hyper_node.version == NULL) { pr_debug("Xen version not found\n"); return; } - pr_info("Xen %s support found\n", version); + pr_info("Xen %s support found\n", hyper_node.version); xen_domain_type = XEN_HVM_DOMAIN; @@ -305,6 +323,14 @@ static void __init xen_acpi_guest_init(void) static void __init xen_dt_guest_init(void) { + struct device_node *xen_node; + + xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); + if (!xen_node) { + pr_err("Xen support was detected before, but it has disappeared\n"); + return; + } + xen_events_irq = irq_of_parse_and_map(xen_node, 0); } diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 450987d..6cf5051 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -313,6 +313,7 @@ void __init setup_arch(char **cmdline_p) */ local_async_enable(); + xen_early_init(); efi_init(); arm64_memblock_init(); @@ -334,7 +335,6 @@ void __init setup_arch(char **cmdline_p) } else { psci_acpi_init(); } - xen_early_init(); cpu_read_bootcpu_ops(); smp_init_cpus(); -- 2.1.4