Message-ID: <20081104062734.GA4420@havoc.gtf.org>
Date:	Tue, 4 Nov 2008 01:27:34 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: [git patches] libata hibernation fixes


This adds code at a late stage (heading towards -rc4), but does
eliminate a particular spin-up overcycling behavior associated with
hibernation.

Rafael's extended description below...  Separated to make it easier to
pull-or-not, separate from the other libata fixes.  There shouldn't be
any merge trouble between the two.

	Jeff




SATA: Blacklist systems that spin off disks during ACPI power off

Some notebooks from HP have the problem that their BIOSes attempt to
spin down hard drives before entering ACPI system states S4 and S5.
This leads to a yo-yo effect during system power-off shutdown and
the last phase of hibernation when the disk is first spun down by
the kernel and then almost immediately turned on and off by the BIOS.
This, in turn, may result in shortening the disk's life times.

To prevent this from happening we can blacklist the affected systems
using DMI information.  However, only the on-board controlles should be
blacklisted and their PCI slot numbers can be used for this purpose.
Unfortunately the existing interface for checking DMI information of
the system is not very convenient for this purpose, because to use
it, we would have to define special callback functions or create a
separate struct dmi_system_id table for each blacklisted system.

To overcome this difficulty introduce a new function dmi_first_match()
returning a pointer to the first entry in an array of struct
dmi_system_id elements that matches the system DMI information.  Then,
we can use this pointer to access the entry's .driver_data field
containing the additional information, such as the PCI slot number,
allowing us to do the desired blacklisting.

Introduce a new libata flag ATA_FLAG_NO_POWEROFF_SPINDOWN that, if
set, will prevent disks from being spun off during system power off
and hibernation (to handle the hibernation case we need a new system
state SYSTEM_HIBERNATE_ENTER that can be checked against by libata,
in analogy with SYSTEM_POWER_OFF).  Use dmi_first_match() to set
this flag for some systems affected by the problem described above
(HP nx6325, HP nx6310, HP 2510p).

Please pull from 'hibern_regress' branch of
master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev.git hibern_regress

to receive the following updates:

 drivers/ata/ahci.c          |   32 ++++++++++++++++++
 drivers/ata/ata_piix.c      |   34 +++++++++++++++++++
 drivers/ata/libata-scsi.c   |   20 ++++++++++--
 drivers/ata/sata_sil.c      |   36 ++++++++++++++++++++-
 drivers/firmware/dmi_scan.c |   74 ++++++++++++++++++++++++++++++++-----------
 include/linux/dmi.h         |    1 +
 include/linux/libata.h      |    2 +
 include/linux/suspend.h     |    2 +
 kernel/power/disk.c         |   10 ++++++
 9 files changed, 188 insertions(+), 23 deletions(-)

Rafael J. Wysocki (6):
      Hibernation: Introduce system_entering_hibernation
      DMI: Introduce dmi_first_match to make the interface more flexible
      SATA: Blacklisting of systems that spin off disks during ACPI power off (rev. 2)
      SATA AHCI: Blacklist system that spins off disks during ACPI power off
      SATA Sil: Blacklist system that spins off disks during ACPI power off
      SATA PIIX: Blacklist system that spins off disks during ACPI power off

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index a67b8e7..8e8790b 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2546,6 +2546,32 @@ static void ahci_p5wdh_workaround(struct ata_host *host)
 	}
 }
 
+static bool ahci_broken_system_poweroff(struct pci_dev *pdev)
+{
+	static const struct dmi_system_id broken_systems[] = {
+		{
+			.ident = "HP Compaq nx6310",
+			.matches = {
+				DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+				DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6310"),
+			},
+			/* PCI slot number of the controller */
+			.driver_data = (void *)0x1FUL,
+		},
+
+		{ }	/* terminate list */
+	};
+	const struct dmi_system_id *dmi = dmi_first_match(broken_systems);
+
+	if (dmi) {
+		unsigned long slot = (unsigned long)dmi->driver_data;
+		/* apply the quirk only to on-board controllers */
+		return slot == PCI_SLOT(pdev->devfn);
+	}
+
+	return false;
+}
+
 static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int printed_version;
@@ -2641,6 +2667,12 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		}
 	}
 
+	if (ahci_broken_system_poweroff(pdev)) {
+		pi.flags |= ATA_FLAG_NO_POWEROFF_SPINDOWN;
+		dev_info(&pdev->dev,
+			"quirky BIOS, skipping spindown on poweroff\n");
+	}
+
 	/* CAP.NP sometimes indicate the index of the last enabled
 	 * port, at other times, that of the last possible port, so
 	 * determining the maximum port number requires looking at
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 8e37be1..f5fff92 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1370,6 +1370,32 @@ static void piix_iocfg_bit18_quirk(struct pci_dev *pdev)
 	}
 }
 
+static bool piix_broken_system_poweroff(struct pci_dev *pdev)
+{
+	static const struct dmi_system_id broken_systems[] = {
+		{
+			.ident = "HP Compaq 2510p",
+			.matches = {
+				DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+				DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 2510p"),
+			},
+			/* PCI slot number of the controller */
+			.driver_data = (void *)0x1FUL,
+		},
+
+		{ }	/* terminate list */
+	};
+	const struct dmi_system_id *dmi = dmi_first_match(broken_systems);
+
+	if (dmi) {
+		unsigned long slot = (unsigned long)dmi->driver_data;
+		/* apply the quirk only to on-board controllers */
+		return slot == PCI_SLOT(pdev->devfn);
+	}
+
+	return false;
+}
+
 /**
  *	piix_init_one - Register PIIX ATA PCI device with kernel services
  *	@pdev: PCI device to register
@@ -1405,6 +1431,14 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
 	if (!in_module_init)
 		return -ENODEV;
 
+	if (piix_broken_system_poweroff(pdev)) {
+		piix_port_info[ent->driver_data].flags |=
+				ATA_FLAG_NO_POWEROFF_SPINDOWN |
+					ATA_FLAG_NO_HIBERNATE_SPINDOWN;
+		dev_info(&pdev->dev, "quirky BIOS, skipping spindown "
+				"on poweroff and hibernation\n");
+	}
+
 	port_info[0] = piix_port_info[ent->driver_data];
 	port_info[1] = piix_port_info[ent->driver_data];
 
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index bbb30d8..0a0aa95 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -46,6 +46,7 @@
 #include <linux/libata.h>
 #include <linux/hdreg.h>
 #include <linux/uaccess.h>
+#include <linux/suspend.h>
 
 #include "libata.h"
 
@@ -1307,6 +1308,17 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
 
 		tf->command = ATA_CMD_VERIFY;	/* READ VERIFY */
 	} else {
+		/* Some odd clown BIOSen issue spindown on power off (ACPI S4
+		 * or S5) causing some drives to spin up and down again.
+		 */
+		if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
+		    system_state == SYSTEM_POWER_OFF)
+			goto skip;
+
+		if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
+		     system_entering_hibernation())
+			goto skip;
+
 		/* XXX: This is for backward compatibility, will be
 		 * removed.  Read Documentation/feature-removal-schedule.txt
 		 * for more info.
@@ -1330,8 +1342,7 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
 				scmd->scsi_done = qc->scsidone;
 				qc->scsidone = ata_delayed_done;
 			}
-			scmd->result = SAM_STAT_GOOD;
-			return 1;
+			goto skip;
 		}
 
 		/* Issue ATA STANDBY IMMEDIATE command */
@@ -1347,10 +1358,13 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
 
 	return 0;
 
-invalid_fld:
+ invalid_fld:
 	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
 	/* "Invalid field in cbd" */
 	return 1;
+ skip:
+	scmd->result = SAM_STAT_GOOD;
+	return 1;
 }
 
 
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
index 031d7b7..f1dd478 100644
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -603,11 +603,38 @@ static void sil_init_controller(struct ata_host *host)
 	}
 }
 
+static bool sil_broken_system_poweroff(struct pci_dev *pdev)
+{
+	static const struct dmi_system_id broken_systems[] = {
+		{
+			.ident = "HP Compaq nx6325",
+			.matches = {
+				DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+				DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
+			},
+			/* PCI slot number of the controller */
+			.driver_data = (void *)0x12UL,
+		},
+
+		{ }	/* terminate list */
+	};
+	const struct dmi_system_id *dmi = dmi_first_match(broken_systems);
+
+	if (dmi) {
+		unsigned long slot = (unsigned long)dmi->driver_data;
+		/* apply the quirk only to on-board controllers */
+		return slot == PCI_SLOT(pdev->devfn);
+	}
+
+	return false;
+}
+
 static int sil_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int printed_version;
 	int board_id = ent->driver_data;
-	const struct ata_port_info *ppi[] = { &sil_port_info[board_id], NULL };
+	struct ata_port_info pi = sil_port_info[board_id];
+	const struct ata_port_info *ppi[] = { &pi, NULL };
 	struct ata_host *host;
 	void __iomem *mmio_base;
 	int n_ports, rc;
@@ -621,6 +648,13 @@ static int sil_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (board_id == sil_3114)
 		n_ports = 4;
 
+	if (sil_broken_system_poweroff(pdev)) {
+		pi.flags |= ATA_FLAG_NO_POWEROFF_SPINDOWN |
+					ATA_FLAG_NO_HIBERNATE_SPINDOWN;
+		dev_info(&pdev->dev, "quirky BIOS, skipping spindown "
+				"on poweroff and hibernation\n");
+	}
+
 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
 	if (!host)
 		return -ENOMEM;
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 3e526b6..6e88b99 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -415,6 +415,27 @@ void __init dmi_scan_machine(void)
 }
 
 /**
+ *	dmi_match - check if dmi_system_id structure matches system DMI data
+ *	@dmi: pointer to the dmi_system_id structure to check
+ */
+static bool dmi_match(const struct dmi_system_id *dmi)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
+		int s = dmi->matches[i].slot;
+		if (s == DMI_NONE)
+			continue;
+		if (dmi_ident[s]
+		    && strstr(dmi_ident[s], dmi->matches[i].substr))
+			continue;
+		/* No match */
+		return false;
+	}
+	return true;
+}
+
+/**
  *	dmi_check_system - check system DMI data
  *	@list: array of dmi_system_id structures to match against
  *		All non-null elements of the list must match
@@ -429,32 +450,47 @@ void __init dmi_scan_machine(void)
  */
 int dmi_check_system(const struct dmi_system_id *list)
 {
-	int i, count = 0;
-	const struct dmi_system_id *d = list;
-
-	WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
-
-	while (d->ident) {
-		for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
-			int s = d->matches[i].slot;
-			if (s == DMI_NONE)
-				continue;
-			if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
-				continue;
-			/* No match */
-			goto fail;
+	int count = 0;
+	const struct dmi_system_id *d;
+
+	for (d = list; d->ident; d++)
+		if (dmi_match(d)) {
+			count++;
+			if (d->callback && d->callback(d))
+				break;
 		}
-		count++;
-		if (d->callback && d->callback(d))
-			break;
-fail:		d++;
-	}
 
 	return count;
 }
 EXPORT_SYMBOL(dmi_check_system);
 
 /**
+ *	dmi_first_match - find dmi_system_id structure matching system DMI data
+ *	@list: array of dmi_system_id structures to match against
+ *		All non-null elements of the list must match
+ *		their slot's (field index's) data (i.e., each
+ *		list string must be a substring of the specified
+ *		DMI slot's string data) to be considered a
+ *		successful match.
+ *
+ *	Walk the blacklist table until the first match is found.  Return the
+ *	pointer to the matching entry or NULL if there's no match.
+ */
+const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
+{
+	const struct dmi_system_id *d;
+
+	WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
+
+	for (d = list; d->ident; d++)
+		if (dmi_match(d))
+			return d;
+
+	return NULL;
+}
+EXPORT_SYMBOL(dmi_first_match);
+
+/**
  *	dmi_get_system_info - return DMI data value
  *	@field: data index (see enum dmi_field)
  *
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index e5084eb..6e20820 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -38,6 +38,7 @@ struct dmi_device {
 #ifdef CONFIG_DMI
 
 extern int dmi_check_system(const struct dmi_system_id *list);
+const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list);
 extern const char * dmi_get_system_info(int field);
 extern const struct dmi_device * dmi_find_device(int type, const char *name,
 	const struct dmi_device *from);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index f5441ed..cc0ceaf 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -187,6 +187,8 @@ enum {
 	ATA_FLAG_PIO_POLLING	= (1 << 9), /* use polling PIO if LLD
 					     * doesn't handle PIO interrupts */
 	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */
+	ATA_FLAG_NO_POWEROFF_SPINDOWN = (1 << 11), /* don't spindown before poweroff */
+	ATA_FLAG_NO_HIBERNATE_SPINDOWN = (1 << 12), /* don't spindown before hibernation */
 	ATA_FLAG_DEBUGMSG	= (1 << 13),
 	ATA_FLAG_IGN_SIMPLEX	= (1 << 15), /* ignore SIMPLEX */
 	ATA_FLAG_NO_IORDY	= (1 << 16), /* controller lacks iordy */
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 2ce8207..195200b 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -232,6 +232,7 @@ extern unsigned long get_safe_page(gfp_t gfp_mask);
 
 extern void hibernation_set_ops(struct platform_hibernation_ops *ops);
 extern int hibernate(void);
+extern bool system_entering_hibernation(void);
 #else /* CONFIG_HIBERNATION */
 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 static inline void swsusp_set_page_free(struct page *p) {}
@@ -239,6 +240,7 @@ static inline void swsusp_unset_page_free(struct page *p) {}
 
 static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}
 static inline int hibernate(void) { return -ENOSYS; }
+static inline bool system_entering_hibernation(void) { return false; }
 #endif /* CONFIG_HIBERNATION */
 
 #ifdef CONFIG_PM_SLEEP
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index c9d7408..248e243 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -72,6 +72,14 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
 	mutex_unlock(&pm_mutex);
 }
 
+static bool entering_platform_hibernation;
+
+bool system_entering_hibernation(void)
+{
+	return entering_platform_hibernation;
+}
+EXPORT_SYMBOL_GPL(system_entering_hibernation);
+
 #ifdef CONFIG_PM_DEBUG
 static void hibernation_debug_sleep(void)
 {
@@ -416,6 +424,7 @@ int hibernation_platform_enter(void)
 	if (error)
 		goto Close;
 
+	entering_platform_hibernation = true;
 	suspend_console();
 	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_HIBERNATE);
@@ -451,6 +460,7 @@ int hibernation_platform_enter(void)
  Finish:
 	hibernation_ops->finish();
  Resume_devices:
+	entering_platform_hibernation = false;
 	device_resume(PMSG_RESTORE);
 	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
--
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