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authorLinus Torvalds <torvalds@linux-foundation.org>2023-09-05 22:37:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-09-05 22:37:28 +0300
commit4b3d6e0c6c4cb3565c73012d7d292c22e68393a9 (patch)
treea0f5fd3b24e9d7377e42a6f60d40e65bb2e193c5 /Documentation/driver-api
parent7733171926cc336ddf0c8f847eefaff569dbff86 (diff)
parent27fd071040e3a5bbea9f44548c93f1092b451714 (diff)
downloadlinux-4b3d6e0c6c4cb3565c73012d7d292c22e68393a9.tar.xz
Merge tag 'ata-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata
Pull ata updates from Damien Le Moal: - Fix OF include file for ata platform drivers (Rob) - Simplify various ahci, sata and pata platform drivers using the function devm_platform_ioremap_resource() (Yangtao) - Cleanup libata time related argument types (e.g. timeouts values) (Sergey) - Cleanup libata code around error handling as all ata drivers now define a error_handler operation (Hannes and Niklas) - Remove functions intended for libsas that are in fact unused (Niklas) - Change the remove device callback of platform drivers to a null function (Uwe) - Simplify the pata_imx driver using devm_clk_get_enabled() (Li) - Remove old and uinused remnants of the ide code in arm, parisc, powerpc, sparc and m68k architectures and associated drivers (pata_buddha, pata_falcon and pata_gayle) (Geert) - Add missing MODULE_DESCRIPTION() in the sata_gemini and pata_ftide010 drivers (me) - Several fixes for the pata_ep93xx and pata_falcon drivers (Nikita, Michael) - Add Elkhart Lake AHCI controller support to the ahci driver (Werner) - Disable NCQ trim on Micron 1100 drives (Pawel) * tag 'ata-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata: (60 commits) ata: libata-core: Disable NCQ_TRIM on Micron 1100 drives ata: ahci: Add Elkhart Lake AHCI controller ata: pata_falcon: add data_swab option to byte-swap disk data ata: pata_falcon: fix IO base selection for Q40 ata: pata_ep93xx: use soc_device_match for UDMA modes ata: pata_ep93xx: fix error return code in probe ata: sata_gemini: Add missing MODULE_DESCRIPTION ata: pata_ftide010: Add missing MODULE_DESCRIPTION m68k: Remove <asm/ide.h> ata: pata_gayle: Remove #include <asm/ide.h> ata: pata_falcon: Remove #include <asm/ide.h> ata: pata_buddha: Remove #include <asm/ide.h> asm-generic: Remove ide_iops.h sparc: Remove <asm/ide.h> powerpc: Remove <asm/ide.h> parisc: Remove <asm/ide.h> ARM: Remove <asm/ide.h> ata: pata_imx: Use helper function devm_clk_get_enabled() ata: sata_rcar: Convert to platform remove callback returning void ata: sata_mv: Convert to platform remove callback returning void ...
Diffstat (limited to 'Documentation/driver-api')
-rw-r--r--Documentation/driver-api/libata.rst38
1 files changed, 6 insertions, 32 deletions
diff --git a/Documentation/driver-api/libata.rst b/Documentation/driver-api/libata.rst
index 311af516a3fd..5da27a749246 100644
--- a/Documentation/driver-api/libata.rst
+++ b/Documentation/driver-api/libata.rst
@@ -32,22 +32,6 @@ register blocks.
:c:type:`struct ata_port_operations <ata_port_operations>`
----------------------------------------------------------
-Disable ATA port
-~~~~~~~~~~~~~~~~
-
-::
-
- void (*port_disable) (struct ata_port *);
-
-
-Called from :c:func:`ata_bus_probe` error path, as well as when unregistering
-from the SCSI module (rmmod, hot unplug). This function should do
-whatever needs to be done to take the port out of use. In most cases,
-:c:func:`ata_port_disable` can be used as this hook.
-
-Called from :c:func:`ata_bus_probe` on a failed probe. Called from
-:c:func:`ata_scsi_release`.
-
Post-IDENTIFY device configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -274,14 +258,6 @@ Exception and probe handling (EH)
::
- void (*eng_timeout) (struct ata_port *ap);
- void (*phy_reset) (struct ata_port *ap);
-
-
-Deprecated. Use ``->error_handler()`` instead.
-
-::
-
void (*freeze) (struct ata_port *ap);
void (*thaw) (struct ata_port *ap);
@@ -364,8 +340,7 @@ SATA phy read/write
u32 val);
-Read and write standard SATA phy registers. Currently only used if
-``->phy_reset`` hook called the :c:func:`sata_phy_reset` helper function.
+Read and write standard SATA phy registers.
sc_reg is one of SCR_STATUS, SCR_CONTROL, SCR_ERROR, or SCR_ACTIVE.
Init and shutdown
@@ -536,13 +511,12 @@ to return without deallocating the qc. This leads us to
:c:func:`ata_scsi_error` is the current ``transportt->eh_strategy_handler()``
for libata. As discussed above, this will be entered in two cases -
-timeout and ATAPI error completion. This function calls low level libata
-driver's :c:func:`eng_timeout` callback, the standard callback for which is
-:c:func:`ata_eng_timeout`. It checks if a qc is active and calls
-:c:func:`ata_qc_timeout` on the qc if so. Actual error handling occurs in
-:c:func:`ata_qc_timeout`.
+timeout and ATAPI error completion. This function will check if a qc is active
+and has not failed yet. Such a qc will be marked with AC_ERR_TIMEOUT such that
+EH will know to handle it later. Then it calls low level libata driver's
+:c:func:`error_handler` callback.
-If EH is invoked for timeout, :c:func:`ata_qc_timeout` stops BMDMA and
+When the :c:func:`error_handler` callback is invoked it stops BMDMA and
completes the qc. Note that as we're currently in EH, we cannot call
scsi_done. As described in SCSI EH doc, a recovered scmd should be
either retried with :c:func:`scsi_queue_insert` or finished with