The current implementation may cause BUG_ON() in blkfront_aio()
BUG_ON(n > BLKIF_MAX_SEGMENTS_PER_REQUEST);
In pvblock_iop(), a read/write operation will be split into smaller
chunks of data so that the size in one access (aio_nbytes) is limited
to, at the maximum,
BLKIF_MAX_SEGMENTS_PER_REQUEST * PAGE_SIZE
But this works only if when the *buffer* passed in to pvblock_io()
is page-aligned. If not, the given data region may stand across
(BLKIF_MAX_SEGMENTS_PER_REQUEST + 1) pages. See the logic in
blkfront_aio():
start = (uintptr_t)aiocbp->aio_buf & PAGE_MASK;
end = ((uintptr_t)aiocbp->aio_buf + aiocbp->aio_nbytes +
PAGE_SIZE - 1) & PAGE_MASK;
Then this will lead to BUG_ON() above.
This can be fixed by decreasing the maximum size of aio_nbytes.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Fixes: commit 3a739cc6c9 ("xen: pvblock: Implement front-back protocol and do IO")
The return value is not used for anythig, and in a later patch the
behavior of the _err iterator will change in an incompatible way.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Update pvblock_probe() to avoid using internal var:
Signed-off-by: Simon Glass <sjg@chromium.org>
We currently have an if_type (interface type) and a uclass id. These are
closely related and we don't need to have both.
Drop the if_type values and use the uclass ones instead.
Maintain the existing, subtle, one-way conversion between UCLASS_USB and
UCLASS_MASS_STORAGE for now, and add a comment.
Signed-off-by: Simon Glass <sjg@chromium.org>
Define LOG_CATEGORY for all uclass to allow filtering with
log command.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Move this out of the common header and include it only where needed. In
a number of cases this requires adding "struct udevice;" to avoid adding
another large header or in other cases replacing / adding missing header
files that had been pulled in, very indirectly. Finally, we have a few
cases where we did not need to include <asm/global_data.h> at all, so
remove that include.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
We use 'priv' for private data but often use 'platdata' for platform data.
We can't really use 'pdata' since that is ambiguous (it could mean private
or platform data).
Rename some of the latter variables to end with 'plat' for consistency.
Signed-off-by: Simon Glass <sjg@chromium.org>
This construct is quite long-winded. In earlier days it made some sense
since auto-allocation was a strange concept. But with driver model now
used pretty universally, we can shorten this to 'auto'. This reduces
verbosity and makes it easier to read.
Coincidentally it also ensures that every declaration is on one line,
thus making dtoc's job easier.
Signed-off-by: Simon Glass <sjg@chromium.org>
Cleaning up the following:
ERROR: do not use assignment in if condition
#281: FILE: drivers/xen/pvblock.c:260:
+ if ((err = xenbus_switch_state(XBT_NIL, nodename,
CHECK:COMPARISON_TO_NULL: Comparison to NULL could be written "err"
#52: FILE: drivers/xen/pvblock.c:298:
+ if (err != NULL) {
ERROR: do not use assignment in if condition
#176: FILE: drivers/xen/gnttab.c:103:
+ if ((flags = nflags) & (GTF_reading | GTF_writing)) {
WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#329: FILE: include/xen/gnttab.h:1:
+/*
WARNING: Misplaced SPDX-License-Identifier tag - use line 1 instead
#330: FILE: include/xen/gnttab.h:2:
+ * SPDX-License-Identifier: GPL-2.0
ERROR: do not use assignment in if condition
#630: FILE: lib/sscanf.c:558:
+ if ((n = inr) < width) {
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Implement Xen para-virtual frontend to backend communication
and actually read/write disk data.
This is based on mini-os implementation of the para-virtual block
frontend driver.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Read essential virtual block device configuration data from XenStore,
initialize front ring and event channel.
Update block device description with actual block size.
Use code for XenStore from mini-os.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Add initial infrastructure for Xen para-virtualized block device.
This includes compile-time configuration and the skeleton for
the future driver implementation.
Add new class UCLASS_PVBLOCK which is going to be a parent for
virtual block devices.
Add new interface type IF_TYPE_PVBLOCK.
Implement basic driver setup by reading XenStore configuration.
Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
