diff options
author | Jason J. Herne <jjherne@linux.ibm.com> | 2024-04-15 18:25:51 +0300 |
---|---|---|
committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-04-22 13:49:17 +0300 |
commit | 6e6973948ce6911e35cb559bc53de4156b4a9675 (patch) | |
tree | c37f6a7f0115f8212c69a4d3104ab54b7f74700c | |
parent | ba05b39d54eef78043b5c8ee90545cb06a98ae6f (diff) | |
download | linux-6e6973948ce6911e35cb559bc53de4156b4a9675.tar.xz |
s390/ap: Externalize AP bus specific bitmap reading function
Rename hex2bitmap() to ap_hex2bitmap() and export it for external
use. This function will be used by the implementation of the vfio-ap
ap_config sysfs attribute.
Signed-off-by: "Jason J. Herne" <jjherne@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Link: https://lore.kernel.org/r/20240415152555.13152-2-jjherne@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
-rw-r--r-- | drivers/s390/crypto/ap_bus.c | 13 | ||||
-rw-r--r-- | drivers/s390/crypto/ap_bus.h | 22 |
2 files changed, 25 insertions, 10 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c index 09059b3a3a42..c20b45092079 100644 --- a/drivers/s390/crypto/ap_bus.c +++ b/drivers/s390/crypto/ap_bus.c @@ -1043,15 +1043,7 @@ static struct notifier_block ap_bus_nb = { .notifier_call = ap_bus_cfg_chg, }; -/* - * hex2bitmap() - parse hex mask string and set bitmap. - * Valid strings are "0x012345678" with at least one valid hex number. - * Rest of the bitmap to the right is padded with 0. No spaces allowed - * within the string, the leading 0x may be omitted. - * Returns the bitmask with exactly the bits set as given by the hex - * string (both in big endian order). - */ -static int hex2bitmap(const char *str, unsigned long *bitmap, int bits) +int ap_hex2bitmap(const char *str, unsigned long *bitmap, int bits) { int i, n, b; @@ -1078,6 +1070,7 @@ static int hex2bitmap(const char *str, unsigned long *bitmap, int bits) return -EINVAL; return 0; } +EXPORT_SYMBOL(ap_hex2bitmap); /* * modify_bitmap() - parse bitmask argument and modify an existing @@ -1143,7 +1136,7 @@ static int ap_parse_bitmap_str(const char *str, unsigned long *bitmap, int bits, rc = modify_bitmap(str, newmap, bits); } else { memset(newmap, 0, size); - rc = hex2bitmap(str, newmap, bits); + rc = ap_hex2bitmap(str, newmap, bits); } return rc; } diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h index 59c7ed49aa02..fdbc6fdfdf57 100644 --- a/drivers/s390/crypto/ap_bus.h +++ b/drivers/s390/crypto/ap_bus.h @@ -344,6 +344,28 @@ int ap_parse_mask_str(const char *str, struct mutex *lock); /* + * ap_hex2bitmap() - Convert a string containing a hexadecimal number (str) + * into a bitmap (bitmap) with bits set that correspond to the bits represented + * by the hex string. Input and output data is in big endian order. + * + * str - Input hex string of format "0x1234abcd". The leading "0x" is optional. + * At least one digit is required. Must be large enough to hold the number of + * bits represented by the bits parameter. + * + * bitmap - Pointer to a bitmap. Upon successful completion of this function, + * this bitmap will have bits set to match the value of str. If bitmap is longer + * than str, then the rightmost bits of bitmap are padded with zeros. Must be + * large enough to hold the number of bits represented by the bits parameter. + * + * bits - Length, in bits, of the bitmap represented by str. Must be a multiple + * of 8. + * + * Returns: 0 On success + * -EINVAL If str format is invalid or bits is not a multiple of 8. + */ +int ap_hex2bitmap(const char *str, unsigned long *bitmap, int bits); + +/* * Interface to wait for the AP bus to have done one initial ap bus * scan and all detected APQNs have been bound to device drivers. * If these both conditions are not fulfilled, this function blocks |