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Commit 0cba632b authored by Jeff Garzik's avatar Jeff Garzik
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libata: doc updates

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Documentation/DocBook/libata.tmpl
View file @ 0cba632b
......@@ -58,26 +58,6 @@
</para>
</chapter>
<chapter id="libataThanks">
<title>Thanks</title>
<para>
The bulk of the ATA knowledge comes thanks to long conversations with
Andre Hedrick (www.linux-ide.org), and long hours pondering the ATA
and SCSI specifications.
</para>
<para>
Thanks to Alan Cox for pointing out similarities
between SATA and SCSI, and in general for motivation to hack on
libata.
</para>
<para>
libata's device detection
method, ata_pio_devchk, and in general all the early probing was
based on extensive study of Hale Landis's probe/reset code in his
ATADRVR driver (www.ata-atapi.com).
</para>
</chapter>
<chapter id="libataDriverApi">
<title>libata Driver API</title>
<sect1>
......@@ -314,4 +294,24 @@ and other resources, etc.
!Idrivers/scsi/sata_sil.c
</chapter>
<chapter id="libataThanks">
<title>Thanks</title>
<para>
The bulk of the ATA knowledge comes thanks to long conversations with
Andre Hedrick (www.linux-ide.org), and long hours pondering the ATA
and SCSI specifications.
</para>
<para>
Thanks to Alan Cox for pointing out similarities
between SATA and SCSI, and in general for motivation to hack on
libata.
</para>
<para>
libata's device detection
method, ata_pio_devchk, and in general all the early probing was
based on extensive study of Hale Landis's probe/reset code in his
ATADRVR driver (www.ata-atapi.com).
</para>
</chapter>
</book>
drivers/scsi/ata_piix.c
View file @ 0cba632b
......@@ -663,15 +663,6 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
return ata_pci_init_one(pdev, port_info, n_ports);
}
/**
* piix_init -
*
* LOCKING:
*
* RETURNS:
*
*/
static int __init piix_init(void)
{
int rc;
......@@ -687,13 +678,6 @@ static int __init piix_init(void)
return 0;
}
/**
* piix_exit -
*
* LOCKING:
*
*/
static void __exit piix_exit(void)
{
pci_unregister_driver(&piix_pci_driver);
......
drivers/scsi/libata-core.c
View file @ 0cba632b
......@@ -1190,7 +1190,12 @@ static void ata_dev_identify(struct ata_port *ap, unsigned int device)
* ata_bus_probe - Reset and probe ATA bus
* @ap: Bus to probe
*
* Master ATA bus probing function. Initiates a hardware-dependent
* bus reset, then attempts to identify any devices found on
* the bus.
*
* LOCKING:
* PCI/etc. bus probe sem.
*
* RETURNS:
* Zero on success, non-zero on error.
......@@ -1229,10 +1234,14 @@ static int ata_bus_probe(struct ata_port *ap)
}
/**
* ata_port_probe -
* @ap:
* ata_port_probe - Mark port as enabled
* @ap: Port for which we indicate enablement
*
* LOCKING:
* Modify @ap data structure such that the system
* thinks that the entire port is enabled.
*
* LOCKING: host_set lock, or some other form of
* serialization.
*/
void ata_port_probe(struct ata_port *ap)
......@@ -1248,7 +1257,8 @@ void ata_port_probe(struct ata_port *ap)
* PHY registers, to wake up the phy (and device), and
* clear any reset condition.
*
* LOCKING: None. Serialized during ata_bus_probe().
* LOCKING:
* PCI/etc. bus probe sem.
*
*/
void __sata_phy_reset(struct ata_port *ap)
......@@ -1299,7 +1309,8 @@ void __sata_phy_reset(struct ata_port *ap)
* This function resets the SATA bus, and then probes
* the bus for devices.
*
* LOCKING: None. Serialized during ata_bus_probe().
* LOCKING:
* PCI/etc. bus probe sem.
*
*/
void sata_phy_reset(struct ata_port *ap)
......@@ -1431,7 +1442,8 @@ static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
*
* Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
*
* LOCKING: None. Serialized during ata_bus_probe().
* LOCKING:
* PCI/etc. bus probe sem.
*
*/
static void ata_set_mode(struct ata_port *ap)
......@@ -1571,10 +1583,14 @@ static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
}
/**
* ata_bus_edd -
* @ap:
* ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
* @ap: Port to reset and probe
*
* Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
* probe the bus. Not often used these days.
*
* LOCKING: None. Serialized during ata_bus_probe().
* LOCKING:
* PCI/etc. bus probe sem.
*
*/
......@@ -1651,8 +1667,8 @@ static unsigned int ata_bus_softreset(struct ata_port *ap,
* the device is ATA or ATAPI.
*
* LOCKING:
* Inherited from caller. Some functions called by this function
* obtain the host_set lock.
* PCI/etc. bus probe sem.
* Obtains host_set lock.
*
* SIDE EFFECTS:
* Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
......@@ -1894,7 +1910,11 @@ static int fgb(u32 bitmap)
* @xfer_mode_out: (output) SET FEATURES - XFER MODE code
* @xfer_shift_out: (output) bit shift that selects this mode
*
* Based on host and device capabilities, determine the
* maximum transfer mode that is amenable to all.
*
* LOCKING:
* PCI/etc. bus probe sem.
*
* RETURNS:
* Zero on success, negative on error.
......@@ -1930,7 +1950,8 @@ static int ata_choose_xfer_mode(struct ata_port *ap,
* Issue SET FEATURES - XFER MODE command to device @dev
* on port @ap.
*
* LOCKING: None. Serialized during ata_bus_probe().
* LOCKING:
* PCI/etc. bus probe sem.
*/
static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
......@@ -1968,10 +1989,13 @@ static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
}
/**
* ata_sg_clean -
* @qc:
* ata_sg_clean - Unmap DMA memory associated with command
* @qc: Command containing DMA memory to be released
*
* Unmap all mapped DMA memory associated with this command.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
static void ata_sg_clean(struct ata_queued_cmd *qc)
......@@ -2058,6 +2082,8 @@ static void ata_fill_sg(struct ata_queued_cmd *qc)
* supplied PACKET command.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
* RETURNS: 0 when ATAPI DMA can be used
* nonzero otherwise
*/
......@@ -2088,6 +2114,19 @@ void ata_qc_prep(struct ata_queued_cmd *qc)
ata_fill_sg(qc);
}
/**
* ata_sg_init_one - Associate command with memory buffer
* @qc: Command to be associated
* @buf: Memory buffer
* @buflen: Length of memory buffer, in bytes.
*
* Initialize the data-related elements of queued_cmd @qc
* to point to a single memory buffer, @buf of byte length @buflen.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
struct scatterlist *sg;
......@@ -2105,6 +2144,20 @@ void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
sg->length = buflen;
}
/**
* ata_sg_init - Associate command with scatter-gather table.
* @qc: Command to be associated
* @sg: Scatter-gather table.
* @n_elem: Number of elements in s/g table.
*
* Initialize the data-related elements of queued_cmd @qc
* to point to a scatter-gather table @sg, containing @n_elem
* elements.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
unsigned int n_elem)
{
......@@ -2114,14 +2167,16 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
}
/**
* ata_sg_setup_one -
* @qc:
* ata_sg_setup_one - DMA-map the memory buffer associated with a command.
* @qc: Command with memory buffer to be mapped.
*
* DMA-map the memory buffer associated with queued_cmd @qc.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
* RETURNS:
*
* Zero on success, negative on error.
*/
static int ata_sg_setup_one(struct ata_queued_cmd *qc)
......@@ -2146,13 +2201,16 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
}
/**
* ata_sg_setup -
* @qc:
* ata_sg_setup - DMA-map the scatter-gather table associated with a command.
* @qc: Command with scatter-gather table to be mapped.
*
* DMA-map the scatter-gather table associated with queued_cmd @qc.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
* RETURNS:
* Zero on success, negative on error.
*
*/
......@@ -2182,6 +2240,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
* @ap:
*
* LOCKING:
* None. (executing in kernel thread context)
*
* RETURNS:
*
......@@ -2229,6 +2288,7 @@ static unsigned long ata_pio_poll(struct ata_port *ap)
* @ap:
*
* LOCKING:
* None. (executing in kernel thread context)
*/
static void ata_pio_complete (struct ata_port *ap)
......@@ -2446,6 +2506,7 @@ static void atapi_pio_bytes(struct ata_queued_cmd *qc)
* @ap:
*
* LOCKING:
* None. (executing in kernel thread context)
*/
static void ata_pio_block(struct ata_port *ap)
......@@ -2614,6 +2675,7 @@ static void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
* transaction completed successfully.
*
* LOCKING:
* Inherited from SCSI layer (none, can sleep)
*/
static void ata_qc_timeout(struct ata_queued_cmd *qc)
......@@ -2723,6 +2785,7 @@ void ata_eng_timeout(struct ata_port *ap)
* @dev: Device from whom we request an available command structure
*
* LOCKING:
* None.
*/
static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
......@@ -2748,6 +2811,7 @@ static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
* @dev: Device from whom we request an available command structure
*
* LOCKING:
* None.
*/
struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
......@@ -2812,6 +2876,7 @@ static void __ata_qc_complete(struct ata_queued_cmd *qc)
* in case something prevents using it.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
*/
void ata_qc_free(struct ata_queued_cmd *qc)
......@@ -2825,9 +2890,13 @@ void ata_qc_free(struct ata_queued_cmd *qc)
/**
* ata_qc_complete - Complete an active ATA command
* @qc: Command to complete
* @drv_stat: ATA status register contents
* @drv_stat: ATA Status register contents
*
* Indicate to the mid and upper layers that an ATA
* command has completed, with either an ok or not-ok status.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
*/
......@@ -3234,13 +3303,18 @@ inline unsigned int ata_host_intr (struct ata_port *ap,
/**
* ata_interrupt - Default ATA host interrupt handler
* @irq: irq line
* @dev_instance: pointer to our host information structure
* @irq: irq line (unused)
* @dev_instance: pointer to our ata_host_set information structure
* @regs: unused
*
* Default interrupt handler for PCI IDE devices. Calls
* ata_host_intr() for each port that is not disabled.
*
* LOCKING:
* Obtains host_set lock during operation.
*
* RETURNS:
* IRQ_NONE or IRQ_HANDLED.
*
*/
......@@ -3381,7 +3455,11 @@ static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
* @ent: Probe information provided by low-level driver
* @port_no: Port number associated with this ata_port
*
* Initialize a new ata_port structure, and its associated
* scsi_host.
*
* LOCKING:
* Inherited from caller.
*
*/
......@@ -3436,9 +3514,13 @@ static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
* @host_set: Collections of ports to which we add
* @port_no: Port number associated with this host
*
* Attach low-level ATA driver to system.
*
* LOCKING:
* PCI/etc. bus probe sem.
*
* RETURNS:
* New ata_port on success, for NULL on error.
*
*/
......@@ -3471,12 +3553,22 @@ static struct ata_port * ata_host_add(struct ata_probe_ent *ent,
}
/**
* ata_device_add -
* @ent:
* ata_device_add - Register hardware device with ATA and SCSI layers
* @ent: Probe information describing hardware device to be registered
*
* This function processes the information provided in the probe
* information struct @ent, allocates the necessary ATA and SCSI
* host information structures, initializes them, and registers
* everything with requisite kernel subsystems.
*
* This function requests irqs, probes the ATA bus, and probes
* the SCSI bus.
*
* LOCKING:
* PCI/etc. bus probe sem.
*
* RETURNS:
* Number of ports registered. Zero on error (no ports registered).
*
*/
......@@ -3755,6 +3847,7 @@ ata_pci_init_legacy_mode(struct pci_dev *pdev, struct ata_port_info **port,
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, negative on errno-based value on error.
*
*/
......@@ -3974,15 +4067,6 @@ int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits)
#endif /* CONFIG_PCI */
/**
* ata_init -
*
* LOCKING:
*
* RETURNS:
*
*/
static int __init ata_init(void)
{
ata_wq = create_workqueue("ata");
......
drivers/scsi/libata-scsi.c
View file @ 0cba632b
......@@ -947,7 +947,7 @@ unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
}
/**
* ata_scsiop_noop -
* ata_scsiop_noop - Command handler that simply returns success.
* @args: device IDENTIFY data / SCSI command of interest.
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
* @buflen: Response buffer length.
......
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