forked from AUR/linux-vfio
133 lines
3.9 KiB
Diff
133 lines
3.9 KiB
Diff
From 1e45a10dbea00f3a9ead21a9b3d25ad00021261d Mon Sep 17 00:00:00 2001
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Message-Id: <1e45a10dbea00f3a9ead21a9b3d25ad00021261d.1528777685.git.jan.steffens@gmail.com>
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In-Reply-To: <9a5adbc45b1c7d43fe4b27936f2a6939660617a1.1528777685.git.jan.steffens@gmail.com>
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References: <9a5adbc45b1c7d43fe4b27936f2a6939660617a1.1528777685.git.jan.steffens@gmail.com>
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From: Mika Westerberg <mika.westerberg@linux.intel.com>
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Date: Tue, 22 May 2018 14:16:50 +0300
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Subject: [PATCH 3/3] ACPI / watchdog: Prefer iTCO_wdt always when WDAT table
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uses RTC SRAM
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After we added quirk for Lenovo Z50-70 it turns out there are at least
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two more systems where WDAT table includes instructions accessing RTC
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SRAM. Instead of quirking each system separately, look for such
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instructions in the table and automatically prefer iTCO_wdt if found.
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=199033
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Reported-by: Arnold Guy <aurnoldg@gmail.com>
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Reported-by: Alois Nespor <nespor@fssp.cz>
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Reported-by: Yury Pakin <zxwarior@gmail.com>
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Reported-by: Ihor Chyhin <ihorchyhin@ukr.net>
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Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Acked-by: Guenter Roeck <linux@roeck-us.net>
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---
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drivers/acpi/acpi_watchdog.c | 72 ++++++++++++++++++++++--------------
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1 file changed, 45 insertions(+), 27 deletions(-)
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diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
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index 4bde16fb97d8..95600309ce42 100644
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--- a/drivers/acpi/acpi_watchdog.c
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+++ b/drivers/acpi/acpi_watchdog.c
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@@ -12,54 +12,72 @@
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#define pr_fmt(fmt) "ACPI: watchdog: " fmt
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#include <linux/acpi.h>
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-#include <linux/dmi.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include "internal.h"
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-static const struct dmi_system_id acpi_watchdog_skip[] = {
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- {
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- /*
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- * On Lenovo Z50-70 there are two issues with the WDAT
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- * table. First some of the instructions use RTC SRAM
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- * to store persistent information. This does not work well
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- * with Linux RTC driver. Second, more important thing is
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- * that the instructions do not actually reset the system.
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- *
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- * On this particular system iTCO_wdt seems to work just
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- * fine so we prefer that over WDAT for now.
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- *
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- * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033.
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- */
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- .ident = "Lenovo Z50-70",
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- .matches = {
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- DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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- DMI_MATCH(DMI_PRODUCT_NAME, "20354"),
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- DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Z50-70"),
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- },
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- },
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- {}
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-};
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+#ifdef CONFIG_RTC_MC146818_LIB
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+#include <linux/mc146818rtc.h>
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+
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+/*
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+ * There are several systems where the WDAT table is accessing RTC SRAM to
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+ * store persistent information. This does not work well with the Linux RTC
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+ * driver so on those systems we skip WDAT driver and prefer iTCO_wdt
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+ * instead.
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+ *
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+ * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033.
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+ */
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+static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat)
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+{
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+ const struct acpi_wdat_entry *entries;
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+ int i;
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+
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+ entries = (struct acpi_wdat_entry *)(wdat + 1);
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+ for (i = 0; i < wdat->entries; i++) {
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+ const struct acpi_generic_address *gas;
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+
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+ gas = &entries[i].register_region;
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+ if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
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+ switch (gas->address) {
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+ case RTC_PORT(0):
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+ case RTC_PORT(1):
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+ case RTC_PORT(2):
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+ case RTC_PORT(3):
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+ return true;
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+ }
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+ }
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+ }
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+
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+ return false;
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+}
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+#else
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+static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat)
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+{
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+ return false;
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+}
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+#endif
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static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void)
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{
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const struct acpi_table_wdat *wdat = NULL;
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acpi_status status;
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if (acpi_disabled)
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return NULL;
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- if (dmi_check_system(acpi_watchdog_skip))
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- return NULL;
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-
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status = acpi_get_table(ACPI_SIG_WDAT, 0,
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(struct acpi_table_header **)&wdat);
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if (ACPI_FAILURE(status)) {
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/* It is fine if there is no WDAT */
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return NULL;
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}
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+ if (acpi_watchdog_uses_rtc(wdat)) {
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+ pr_info("Skipping WDAT on this system because it uses RTC SRAM\n");
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+ return NULL;
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+ }
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+
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return wdat;
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}
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--
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2.17.1
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