| Message ID | 1453519184-11908-12-git-send-email-zhaoshenglong@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Sat, 23 Jan 2016, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > 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 <shannon.zhao@linaro.org> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> > 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 0e010bb..cdc0bd2 100644 > --- a/arch/arm/xen/enlighten.c > +++ b/arch/arm/xen/enlighten.c > @@ -19,6 +19,7 @@ > #include <linux/irqreturn.h> > #include <linux/module.h> > #include <linux/of.h> > +#include <linux/of_fdt.h> > #include <linux/of_irq.h> > #include <linux/of_address.h> > #include <linux/cpuidle.h> > @@ -52,8 +53,6 @@ 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, > @@ -222,6 +221,33 @@ 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. > @@ -229,26 +255,18 @@ 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; > > @@ -289,6 +307,14 @@ static void __init xen_acpi_guest_init_events_irq(void) > > static void __init xen_dt_guest_init_events_irq(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 8119479..a4a2878 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(); > -- > 2.0.4 > >
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 0e010bb..cdc0bd2 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -19,6 +19,7 @@ #include <linux/irqreturn.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_fdt.h> #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/cpuidle.h> @@ -52,8 +53,6 @@ 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, @@ -222,6 +221,33 @@ 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. @@ -229,26 +255,18 @@ 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; @@ -289,6 +307,14 @@ static void __init xen_acpi_guest_init_events_irq(void) static void __init xen_dt_guest_init_events_irq(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 8119479..a4a2878 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();