summaryrefslogtreecommitdiffstats
path: root/Documentation/powerpc
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-07 09:28:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-07 09:28:53 -0700
commit4dfddf503670d8def0fddb497e628130fc4522a8 (patch)
treef4bbf85589c13a1994fef75622ec80c48684f475 /Documentation/powerpc
parentd4e65476bc68dbc9231b3c772b71f1576579b6fb (diff)
parent14bf41dcef651c13911a1715e83220732a3a4071 (diff)
downloadlinux-4dfddf503670d8def0fddb497e628130fc4522a8.tar.bz2
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI updates from James Bottomley: "This update includes the usual round of major driver updates (hpsa, be2iscsi, hisi_sas, zfcp, cxlflash). There's a new incarnation of hpsa called smartpqi for which a driver is added, there's some cleanup work of the ibm vscsi target and updates to libfc, plus a whole host of minor fixes and updates and finally the removal of several ISA drivers which seem not to have been used for years" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (173 commits) scsi: mvsas: Mark symbols static where possible scsi: pm8001: Mark symbols static where possible scsi: arcmsr: Simplify user_len checking scsi: fcoe: fix off by one in eth2fc_speed() scsi: dtc: remove from tree scsi: t128: remove from tree scsi: pas16: remove from tree scsi: u14-34f: remove from tree scsi: ultrastor: remove from tree scsi: in2000: remove from tree scsi: wd7000: remove from tree scsi: scsi_dh_alua: Fix memory leak in alua_rtpg() scsi: lpfc: Mark symbols static where possible scsi: hpsa: correct call to hpsa_do_reset scsi: ufs: Get a TM service response from the correct offset scsi: ibmvfc: Fix I/O hang when port is not mapped scsi: megaraid_sas: clean function declarations in megaraid_sas_base.c up scsi: ipr: Remove redundant messages at adapter init time scsi: ipr: Don't log unnecessary 9084 error details scsi: smartpqi: raid bypass lba calculation fix ...
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/cxlflash.txt44
1 files changed, 39 insertions, 5 deletions
diff --git a/Documentation/powerpc/cxlflash.txt b/Documentation/powerpc/cxlflash.txt
index 4202d1bc583c..6d9a2ed32cad 100644
--- a/Documentation/powerpc/cxlflash.txt
+++ b/Documentation/powerpc/cxlflash.txt
@@ -121,7 +121,7 @@ Block library API
below.
The block library can be found on GitHub:
- http://www.github.com/mikehollinger/ibmcapikv
+ http://github.com/open-power/capiflash
CXL Flash Driver IOCTLs
@@ -171,11 +171,30 @@ DK_CXLFLASH_ATTACH
destroyed, the tokens are to be considered stale and subsequent
usage will result in errors.
+ - A valid adapter file descriptor (fd2 >= 0) is only returned on
+ the initial attach for a context. Subsequent attaches to an
+ existing context (DK_CXLFLASH_ATTACH_REUSE_CONTEXT flag present)
+ do not provide the adapter file descriptor as it was previously
+ made known to the application.
+
- When a context is no longer needed, the user shall detach from
- the context via the DK_CXLFLASH_DETACH ioctl.
+ the context via the DK_CXLFLASH_DETACH ioctl. When this ioctl
+ returns with a valid adapter file descriptor and the return flag
+ DK_CXLFLASH_APP_CLOSE_ADAP_FD is present, the application _must_
+ close the adapter file descriptor following a successful detach.
+
+ - When this ioctl returns with a valid fd2 and the return flag
+ DK_CXLFLASH_APP_CLOSE_ADAP_FD is present, the application _must_
+ close fd2 in the following circumstances:
+
+ + Following a successful detach of the last user of the context
+ + Following a successful recovery on the context's original fd2
+ + In the child process of a fork(), following a clone ioctl,
+ on the fd2 associated with the source context
- - A close on fd2 will invalidate the tokens. This operation is not
- required by the user.
+ - At any time, a close on fd2 will invalidate the tokens. Applications
+ should exercise caution to only close fd2 when appropriate (outlined
+ in the previous bullet) to avoid premature loss of I/O.
DK_CXLFLASH_USER_DIRECT
-----------------------
@@ -254,6 +273,10 @@ DK_CXLFLASH_DETACH
success, all "tokens" which had been provided to the user from the
DK_CXLFLASH_ATTACH onward are no longer valid.
+ When the DK_CXLFLASH_APP_CLOSE_ADAP_FD flag was returned on a successful
+ attach, the application _must_ close the fd2 associated with the context
+ following the detach of the final user of the context.
+
DK_CXLFLASH_VLUN_CLONE
----------------------
This ioctl is responsible for cloning a previously created
@@ -261,7 +284,7 @@ DK_CXLFLASH_VLUN_CLONE
support maintaining user space access to storage after a process
forks. Upon success, the child process (which invoked the ioctl)
will have access to the same LUNs via the same resource handle(s)
- and fd2 as the parent, but under a different context.
+ as the parent, but under a different context.
Context sharing across processes is not supported with CXL and
therefore each fork must be met with establishing a new context
@@ -275,6 +298,12 @@ DK_CXLFLASH_VLUN_CLONE
translation tables are copied from the parent context to the child's
and then synced with the AFU.
+ When the DK_CXLFLASH_APP_CLOSE_ADAP_FD flag was returned on a successful
+ attach, the application _must_ close the fd2 associated with the source
+ context (still resident/accessible in the parent process) following the
+ clone. This is to avoid a stale entry in the file descriptor table of the
+ child process.
+
DK_CXLFLASH_VERIFY
------------------
This ioctl is used to detect various changes such as the capacity of
@@ -309,6 +338,11 @@ DK_CXLFLASH_RECOVER_AFU
at which time the context/resources they held will be freed as part of
the release fop.
+ When the DK_CXLFLASH_APP_CLOSE_ADAP_FD flag was returned on a successful
+ attach, the application _must_ unmap and close the fd2 associated with the
+ original context following this ioctl returning success and indicating that
+ the context was recovered (DK_CXLFLASH_RECOVER_AFU_CONTEXT_RESET).
+
DK_CXLFLASH_MANAGE_LUN
----------------------
This ioctl is used to switch a LUN from a mode where it is available