diff options
Diffstat (limited to 'patches/linux-3.15-rc3-ahci-alpm-with-devslp-accounting.patch')
| -rw-r--r-- | patches/linux-3.15-rc3-ahci-alpm-with-devslp-accounting.patch | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/patches/linux-3.15-rc3-ahci-alpm-with-devslp-accounting.patch b/patches/linux-3.15-rc3-ahci-alpm-with-devslp-accounting.patch new file mode 100644 index 0000000..254f58b --- /dev/null +++ b/patches/linux-3.15-rc3-ahci-alpm-with-devslp-accounting.patch @@ -0,0 +1,340 @@ +From 9022555b1fc7c7a71adf3a0871ba3609fc2f4bc0 Mon Sep 17 00:00:00 2001
+From: David Woodhouse <dwmw2@infradead.org>
+Date: Mon, 1 Apr 2013 20:53:07 +0100
+Subject: [PATCH] Updated PowerTOP AHCI ALPM accounting for Device Sleep.
+
+This patch applies to v3.7 onwards (including 3.9-rc4), and adds devslp
+support to the AHCI state accounting. It's based on the patch at
+https://raw.github.com/fenrus75/powertop/master/patches/linux-3.3.0-ahci-alpm-accounting.patch
+
+From: Arjan van de Ven <arjan@linux.intel.com>
+Subject: libata: Add ALPM power state accounting to the AHCI driver
+
+PowerTOP wants to be able to show the user how effective the ALPM link
+power management is for the user. ALPM is worth around 0.5W on a quiet
+link; PowerTOP wants to be able to find cases where the "quiet link" isn't
+actually quiet.
+
+This patch adds state accounting functionality to the AHCI driver for
+PowerTOP to use.
+The parts of the patch are
+1) the sysfs logic of exposing the stats for each state in sysfs
+2) the basic accounting logic that gets update on link change interrupts
+ (or when the user accesses the info from sysfs)
+3) a "accounting enable" flag; in order to get the accounting to work,
+ the driver needs to get phyrdy interrupts on link status changes.
+ Normally and currently this is disabled by the driver when ALPM is
+ on (to reduce overhead); when PowerTOP is running this will need
+ to be on to get usable statistics... hence the sysfs tunable.
+
+The PowerTOP output currently looks like this:
+
+Recent SATA AHCI link activity statistics
+Active Partial Slumber Device name
+ 0.5% 99.5% 0.0% host0
+
+(work to resolve "host0" to a more human readable name is in progress)
+
+Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
+Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
+Signed-off-by: David E. Box <david.e.box@linux.intel.com>
+---
+ drivers/ata/ahci.h | 17 ++++
+ drivers/ata/libahci.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++-
+ 2 files changed, 226 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
+index 2289efd..7a80e34 100644
+--- a/drivers/ata/ahci.h
++++ b/drivers/ata/ahci.h
+@@ -286,6 +286,14 @@ struct ahci_em_priv {
+ unsigned long led_state;
+ };
+
++enum ahci_port_states {
++ AHCI_PORT_NOLINK = 0,
++ AHCI_PORT_ACTIVE = 1,
++ AHCI_PORT_PARTIAL = 2,
++ AHCI_PORT_SLUMBER = 3,
++ AHCI_PORT_DEVSLP = 4
++};
++
+ struct ahci_port_priv {
+ struct ata_link *active_link;
+ struct ahci_cmd_hdr *cmd_slot;
+@@ -307,6 +315,15 @@ struct ahci_port_priv {
+ /* enclosure management info per PM slot */
+ struct ahci_em_priv em_priv[EM_MAX_SLOTS];
+ char *irq_desc; /* desc in /proc/interrupts */
++
++ /* ALPM accounting state and stats */
++ unsigned int accounting_active:1;
++ u64 active_jiffies;
++ u64 partial_jiffies;
++ u64 slumber_jiffies;
++ u64 devslp_jiffies;
++ int previous_state;
++ int previous_jiffies;
+ };
+
+ struct ahci_host_priv {
+diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
+index 36605ab..4e69272 100644
+--- a/drivers/ata/libahci.c
++++ b/drivers/ata/libahci.c
+@@ -99,6 +99,19 @@ static ssize_t ahci_activity_store(struct ata_device *dev,
+ enum sw_activity val);
+ static void ahci_init_sw_activity(struct ata_link *link);
+
++static ssize_t ahci_alpm_show_active(struct device *dev,
++ struct device_attribute *attr, char *buf);
++static ssize_t ahci_alpm_show_slumber(struct device *dev,
++ struct device_attribute *attr, char *buf);
++static ssize_t ahci_alpm_show_devslp(struct device *dev,
++ struct device_attribute *attr, char *buf);
++static ssize_t ahci_alpm_show_partial(struct device *dev,
++ struct device_attribute *attr, char *buf);
++static ssize_t ahci_alpm_show_accounting(struct device *dev,
++ struct device_attribute *attr, char *buf);
++static ssize_t ahci_alpm_set_accounting(struct device *dev,
++ struct device_attribute *attr,
++ const char *buf, size_t count);
+ static ssize_t ahci_show_host_caps(struct device *dev,
+ struct device_attribute *attr, char *buf);
+ static ssize_t ahci_show_host_cap2(struct device *dev,
+@@ -119,6 +132,13 @@ static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
+ static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
+ static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
+ static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
++static DEVICE_ATTR(ahci_alpm_active, S_IRUGO, ahci_alpm_show_active, NULL);
++static DEVICE_ATTR(ahci_alpm_partial, S_IRUGO, ahci_alpm_show_partial, NULL);
++static DEVICE_ATTR(ahci_alpm_slumber, S_IRUGO, ahci_alpm_show_slumber, NULL);
++static DEVICE_ATTR(ahci_alpm_devslp, S_IRUGO, ahci_alpm_show_devslp, NULL);
++static DEVICE_ATTR(ahci_alpm_accounting, S_IRUGO | S_IWUSR,
++ ahci_alpm_show_accounting, ahci_alpm_set_accounting);
++
+ static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
+ ahci_read_em_buffer, ahci_store_em_buffer);
+ static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
+@@ -131,6 +151,11 @@ struct device_attribute *ahci_shost_attrs[] = {
+ &dev_attr_ahci_host_cap2,
+ &dev_attr_ahci_host_version,
+ &dev_attr_ahci_port_cmd,
++ &dev_attr_ahci_alpm_active,
++ &dev_attr_ahci_alpm_partial,
++ &dev_attr_ahci_alpm_slumber,
++ &dev_attr_ahci_alpm_devslp,
++ &dev_attr_ahci_alpm_accounting,
+ &dev_attr_em_buffer,
+ &dev_attr_em_message_supported,
+ NULL
+@@ -225,6 +250,182 @@ static void ahci_enable_ahci(void __iomem *mmio)
+ WARN_ON(1);
+ }
+
++static int get_current_alpm_state(struct ata_port *ap)
++{
++ u32 status = 0;
++
++ ahci_scr_read(&ap->link, SCR_STATUS, &status);
++
++ /* link status is in bits 11-8 */
++ status = status >> 8;
++ status = status & 0xf;
++
++ if (status == 8)
++ return AHCI_PORT_DEVSLP;
++ if (status == 6)
++ return AHCI_PORT_SLUMBER;
++ if (status == 2)
++ return AHCI_PORT_PARTIAL;
++ if (status == 1)
++ return AHCI_PORT_ACTIVE;
++ return AHCI_PORT_NOLINK;
++}
++
++static void account_alpm_stats(struct ata_port *ap)
++{
++ struct ahci_port_priv *pp;
++
++ int new_state;
++ u64 new_jiffies, jiffies_delta;
++
++ if (ap == NULL)
++ return;
++ pp = ap->private_data;
++
++ if (!pp) return;
++
++ new_state = get_current_alpm_state(ap);
++ new_jiffies = jiffies;
++
++ jiffies_delta = new_jiffies - pp->previous_jiffies;
++
++ switch (pp->previous_state) {
++ case AHCI_PORT_NOLINK:
++ pp->active_jiffies = 0;
++ pp->partial_jiffies = 0;
++ pp->slumber_jiffies = 0;
++ break;
++ case AHCI_PORT_ACTIVE:
++ pp->active_jiffies += jiffies_delta;
++ break;
++ case AHCI_PORT_PARTIAL:
++ pp->partial_jiffies += jiffies_delta;
++ break;
++ case AHCI_PORT_SLUMBER:
++ pp->slumber_jiffies += jiffies_delta;
++ break;
++ case AHCI_PORT_DEVSLP:
++ pp->devslp_jiffies += jiffies_delta;
++ break;
++ default:
++ break;
++ }
++ pp->previous_state = new_state;
++ pp->previous_jiffies = new_jiffies;
++}
++
++static ssize_t ahci_alpm_show_active(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct Scsi_Host *shost = class_to_shost(dev);
++ struct ata_port *ap = ata_shost_to_port(shost);
++ struct ahci_port_priv *pp;
++
++ if (!ap || ata_port_is_dummy(ap))
++ return -EINVAL;
++
++ pp = ap->private_data;
++ account_alpm_stats(ap);
++
++ return sprintf(buf, "%u\n", jiffies_to_msecs(pp->active_jiffies));
++}
++
++static ssize_t ahci_alpm_show_partial(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct Scsi_Host *shost = class_to_shost(dev);
++ struct ata_port *ap = ata_shost_to_port(shost);
++ struct ahci_port_priv *pp;
++
++ if (!ap || ata_port_is_dummy(ap))
++ return -EINVAL;
++
++ pp = ap->private_data;
++ account_alpm_stats(ap);
++
++ return sprintf(buf, "%u\n", jiffies_to_msecs(pp->partial_jiffies));
++}
++
++static ssize_t ahci_alpm_show_slumber(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct Scsi_Host *shost = class_to_shost(dev);
++ struct ata_port *ap = ata_shost_to_port(shost);
++ struct ahci_port_priv *pp;
++
++ if (!ap || ata_port_is_dummy(ap))
++ return -EINVAL;
++
++ pp = ap->private_data;
++ account_alpm_stats(ap);
++
++ return sprintf(buf, "%u\n", jiffies_to_msecs(pp->slumber_jiffies));
++}
++
++static ssize_t ahci_alpm_show_devslp(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct Scsi_Host *shost = class_to_shost(dev);
++ struct ata_port *ap = ata_shost_to_port(shost);
++ struct ahci_port_priv *pp;
++
++ if (!ap || ata_port_is_dummy(ap))
++ return -EINVAL;
++
++ pp = ap->private_data;
++ account_alpm_stats(ap);
++
++ return sprintf(buf, "%u\n", jiffies_to_msecs(pp->devslp_jiffies));
++}
++
++static ssize_t ahci_alpm_show_accounting(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct Scsi_Host *shost = class_to_shost(dev);
++ struct ata_port *ap = ata_shost_to_port(shost);
++ struct ahci_port_priv *pp;
++
++ if (!ap || ata_port_is_dummy(ap))
++ return -EINVAL;
++
++ pp = ap->private_data;
++
++ return sprintf(buf, "%u\n", pp->accounting_active);
++}
++
++static ssize_t ahci_alpm_set_accounting(struct device *dev,
++ struct device_attribute *attr,
++ const char *buf, size_t count)
++{
++ unsigned long flags;
++ struct Scsi_Host *shost = class_to_shost(dev);
++ struct ata_port *ap = ata_shost_to_port(shost);
++ struct ahci_port_priv *pp;
++ void __iomem *port_mmio;
++
++ if (!ap || ata_port_is_dummy(ap))
++ return 1;
++
++ pp = ap->private_data;
++ port_mmio = ahci_port_base(ap);
++
++ if (!pp)
++ return 1;
++ if (buf[0] == '0')
++ pp->accounting_active = 0;
++ if (buf[0] == '1')
++ pp->accounting_active = 1;
++
++ /* we need to enable the PHYRDY interrupt when we want accounting */
++ if (pp->accounting_active) {
++ spin_lock_irqsave(ap->lock, flags);
++ pp->intr_mask |= PORT_IRQ_PHYRDY;
++ writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
++ spin_unlock_irqrestore(ap->lock, flags);
++ }
++ return count;
++}
++
+ static ssize_t ahci_show_host_caps(struct device *dev,
+ struct device_attribute *attr, char *buf)
+ {
+@@ -680,9 +881,14 @@ static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+ * Disable interrupts on Phy Ready. This keeps us from
+ * getting woken up due to spurious phy ready
+ * interrupts.
++ *
++ * However, when accounting_active is set, we do want
++ * the interrupts for accounting purposes.
+ */
+- pp->intr_mask &= ~PORT_IRQ_PHYRDY;
+- writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
++ if (!pp->accounting_active) {
++ pp->intr_mask &= ~PORT_IRQ_PHYRDY;
++ writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
++ }
+
+ sata_link_scr_lpm(link, policy, false);
+ }
+@@ -1696,6 +1902,7 @@ static void ahci_handle_port_interrupt(struct ata_port *ap,
+ /* if LPM is enabled, PHYRDY doesn't mean anything */
+ if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
+ status &= ~PORT_IRQ_PHYRDY;
++ account_alpm_stats(ap);
+ ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
+ }
+
+--
+1.7.10.4
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