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Subject[PATCH v5 02/12] libata: bind the Linux device tree to the ACPI device tree
Date
From: Matthew Garrett <mjg@redhat.com>

Associate the ACPI device tree and libata devices.
This patch uses the generic ACPI glue framework to do so.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Holger Macht <holger@homac.de>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
---

Changelog:

- fixed crash reported at https://lkml.org/lkml/2012/2/24/2 (Aaron Lu)
- rename is_pci_ata to compat_pci_ata (Alan Cox)

drivers/acpi/glue.c | 4 +-
drivers/ata/libata-acpi.c | 125 +++++++++++++++++++++++++++++++++++++++++++++
drivers/ata/libata-core.c | 3 ++
drivers/ata/libata.h | 4 ++
4 files changed, 134 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 1564e09..18d6812 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -39,6 +39,7 @@ int register_acpi_bus_type(struct acpi_bus_type *type)
}
return -ENODEV;
}
+EXPORT_SYMBOL(register_acpi_bus_type);

int unregister_acpi_bus_type(struct acpi_bus_type *type)
{
@@ -54,6 +55,7 @@ int unregister_acpi_bus_type(struct acpi_bus_type *type)
}
return -ENODEV;
}
+EXPORT_SYMBOL(unregister_acpi_bus_type);

static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
{
@@ -69,7 +71,6 @@ static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
up_read(&bus_type_sem);
return ret;
}
-EXPORT_SYMBOL_GPL(register_acpi_bus_type);

static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
{
@@ -86,7 +87,6 @@ static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
up_read(&bus_type_sem);
return ret;
}
-EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);

/* Get device's handler per its address under its parent */
struct acpi_find_child {
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index bb7c5f1..ae93593 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -47,6 +47,39 @@ static void ata_acpi_clear_gtf(struct ata_device *dev)
dev->gtf_cache = NULL;
}

+static acpi_handle ap_acpi_handle(struct ata_port *ap)
+{
+ if (ap->flags & ATA_FLAG_ACPI_SATA)
+ return NULL;
+
+ /*
+ * If acpi bind operation has already happened, we can get the handle
+ * for the port by checking the corresponding scsi_host device's
+ * firmware node, otherwise we will need to find out the handle from
+ * its parent's acpi node.
+ */
+ if (ap->scsi_host)
+ return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev);
+ else
+ return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev),
+ ap->port_no);
+}
+
+static acpi_handle dev_acpi_handle(struct ata_device *dev)
+{
+ acpi_integer adr;
+ struct ata_port *ap = dev->link->ap;
+
+ if (ap->flags & ATA_FLAG_ACPI_SATA) {
+ if (!sata_pmp_attached(ap))
+ adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
+ else
+ adr = SATA_ADR(ap->port_no, dev->link->pmp);
+ return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev), adr);
+ } else
+ return acpi_get_child(ap_acpi_handle(ap), dev->devno);
+}
+
/**
* ata_acpi_associate_sata_port - associate SATA port with ACPI objects
* @ap: target SATA port
@@ -1018,3 +1051,95 @@ void ata_acpi_on_disable(struct ata_device *dev)
{
ata_acpi_clear_gtf(dev);
}
+
+static int compat_pci_ata(struct device *dev)
+{
+ struct pci_dev *pdev;
+
+ if (!is_pci_dev(dev))
+ return 0;
+
+ pdev = to_pci_dev(dev);
+
+ if ((pdev->class >> 8) != PCI_CLASS_STORAGE_SATA &&
+ (pdev->class >> 8) != PCI_CLASS_STORAGE_IDE)
+ return 0;
+
+ return 1;
+}
+
+static int ata_acpi_bind_host(struct device *dev, int host, acpi_handle *handle)
+{
+ struct Scsi_Host *shost = dev_to_shost(dev);
+ struct ata_port *ap = ata_shost_to_port(shost);
+
+ if (ap->flags & ATA_FLAG_ACPI_SATA)
+ return -ENODEV;
+
+ *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), ap->port_no);
+
+ if (!*handle)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int ata_acpi_bind_device(struct device *dev, int channel, int id,
+ acpi_handle *handle)
+{
+ struct device *host = dev->parent->parent;
+ struct Scsi_Host *shost = dev_to_shost(host);
+ struct ata_port *ap = ata_shost_to_port(shost);
+ struct ata_device *ata_dev;
+
+ if (ap->flags & ATA_FLAG_ACPI_SATA)
+ ata_dev = &ap->link.device[channel];
+ else
+ ata_dev = &ap->link.device[id];
+
+ *handle = dev_acpi_handle(ata_dev);
+
+ if (!*handle)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int ata_acpi_find_device(struct device *dev, acpi_handle *handle)
+{
+ unsigned int host, channel, id, lun;
+
+ if (sscanf(dev_name(dev), "host%u", &host) == 1) {
+ if (!compat_pci_ata(dev->parent))
+ return -ENODEV;
+
+ return ata_acpi_bind_host(dev, host, handle);
+ } else if (sscanf(dev_name(dev), "%d:%d:%d:%d",
+ &host, &channel, &id, &lun) == 4) {
+ if (!compat_pci_ata(dev->parent->parent->parent))
+ return -ENODEV;
+
+ return ata_acpi_bind_device(dev, channel, id, handle);
+ } else
+ return -ENODEV;
+}
+
+static int ata_acpi_find_dummy(struct device *dev, acpi_handle *handle)
+{
+ return -ENODEV;
+}
+
+static struct acpi_bus_type ata_acpi_bus = {
+ .find_bridge = ata_acpi_find_dummy,
+ .find_device = ata_acpi_find_device,
+};
+
+int ata_acpi_register(void)
+{
+ return scsi_register_acpi_bus_type(&ata_acpi_bus);
+}
+
+void ata_acpi_unregister(void)
+{
+ scsi_unregister_acpi_bus_type(&ata_acpi_bus);
+}
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index cece3a4..5628bf6 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6513,6 +6513,8 @@ static int __init ata_init(void)

ata_parse_force_param();

+ ata_acpi_register();
+
rc = ata_sff_init();
if (rc) {
kfree(ata_force_tbl);
@@ -6539,6 +6541,7 @@ static void __exit ata_exit(void)
ata_release_transport(ata_scsi_transport_template);
libata_transport_exit();
ata_sff_exit();
+ ata_acpi_unregister();
kfree(ata_force_tbl);
}

diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 9d0fd0b..3df3362 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -119,6 +119,8 @@ extern void ata_acpi_on_resume(struct ata_port *ap);
extern int ata_acpi_on_devcfg(struct ata_device *dev);
extern void ata_acpi_on_disable(struct ata_device *dev);
extern void ata_acpi_set_state(struct ata_port *ap, pm_message_t state);
+extern int ata_acpi_register(void);
+extern void ata_acpi_unregister(void);
#else
static inline void ata_acpi_associate_sata_port(struct ata_port *ap) { }
static inline void ata_acpi_associate(struct ata_host *host) { }
@@ -129,6 +131,8 @@ static inline int ata_acpi_on_devcfg(struct ata_device *dev) { return 0; }
static inline void ata_acpi_on_disable(struct ata_device *dev) { }
static inline void ata_acpi_set_state(struct ata_port *ap,
pm_message_t state) { }
+static inline int ata_acpi_register(void) { return 0; }
+static void ata_acpi_unregister(void) { }
#endif

/* libata-scsi.c */
--
1.7.10


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