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authorLuis R. Rodriguez <mcgrof@kernel.org>2016-04-13 17:04:41 -0700
committerIngo Molnar <mingo@kernel.org>2016-04-22 10:29:05 +0200
commit80dfd83dfab6e49a31ab8fc484a801aef1c567bd (patch)
treecd0e8267f6575c90dac27b1b69404dcd22491adc /include/linux/pnp.h
parentfa392794ed8329379f3f637da7c3c2f078309a77 (diff)
x86, drivers/pnpbios: Replace paravirt_enabled() check with legacy device check
Since we are removing paravirt_enabled() replace it with a logical equivalent. Even though PNPBIOS is x86 specific we add an arch-specific type call, which can be implemented by any architecture to show how other legacy attribute devices can later be also checked for with other ACPI legacy attribute flags. This implicates the first ACPI 5.2.9.3 IA-PC Boot Architecture ACPI_FADT_LEGACY_DEVICES flag device, and shows how to add more. The reason pnpbios gets a defined structure and as such uses a different approach than the RTC legacy quirk is that ACPI has a respective RTC flag, while pnpbios does not. We fold the pnpbios quirk under ACPI_FADT_LEGACY_DEVICES ACPI flag use case, and use a struct of possible devices to enable future extensions of this. As per 0-day, this bumps the vmlinux size using i386-tinyconfig as follows: TOTAL TEXT init.text x86_early_init_platform_quirks() +32 +28 +28 +28 That's 4 byte overhead total, the rest is cleared out on init as its all __init text. v2: split out subarch handlng on switch to make it easier later to add other subarchs. The 'fall-through' switch handling can be confusing and we'll remove it later when we add handling for X86_SUBARCH_CE4100. v3: document vmlinux size impact as per 0-day, and also explain why pnpbios is treated differently than the RTC legacy feature. Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: andrew.cooper3@citrix.com Cc: andriy.shevchenko@linux.intel.com Cc: bigeasy@linutronix.de Cc: boris.ostrovsky@oracle.com Cc: david.vrabel@citrix.com Cc: ffainelli@freebox.fr Cc: george.dunlap@citrix.com Cc: glin@suse.com Cc: jgross@suse.com Cc: jlee@suse.com Cc: josh@joshtriplett.org Cc: julien.grall@linaro.org Cc: konrad.wilk@oracle.com Cc: kozerkov@parallels.com Cc: lenb@kernel.org Cc: lguest@lists.ozlabs.org Cc: linux-acpi@vger.kernel.org Cc: lv.zheng@intel.com Cc: matt@codeblueprint.co.uk Cc: mbizon@freebox.fr Cc: rjw@rjwysocki.net Cc: robert.moore@intel.com Cc: rusty@rustcorp.com.au Cc: tiwai@suse.de Cc: toshi.kani@hp.com Cc: xen-devel@lists.xensource.com Link: http://lkml.kernel.org/r/1460592286-300-12-git-send-email-mcgrof@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/pnp.h')
-rw-r--r--include/linux/pnp.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 5df733b8f704..2588ca6a9028 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -337,9 +337,11 @@ extern struct mutex pnp_res_mutex;
#ifdef CONFIG_PNPBIOS
extern struct pnp_protocol pnpbios_protocol;
+extern bool arch_pnpbios_disabled(void);
#define pnp_device_is_pnpbios(dev) ((dev)->protocol == (&pnpbios_protocol))
#else
#define pnp_device_is_pnpbios(dev) 0
+#define arch_pnpbios_disabled() false
#endif
#ifdef CONFIG_PNPACPI