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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-05 00:05:52 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-05 00:05:52 +0300 |
commit | e46cae441824999c858d482ca1f661cf4292c02f (patch) | |
tree | 0bf4dabec0ef16f92723ff0fac0e837f59b48cdc /lib/raid6/s390vx.uc | |
parent | 02bafd96f3a5d8e610b19033ffec55b92459aaae (diff) | |
parent | 6cd997db911f28f2510b771691270c52b63ed2e6 (diff) | |
download | linux-e46cae441824999c858d482ca1f661cf4292c02f.tar.xz |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Martin Schwidefsky:
"The new features and main improvements in this merge for v4.9
- Support for the UBSAN sanitizer
- Set HAVE_EFFICIENT_UNALIGNED_ACCESS, it improves the code in some
places
- Improvements for the in-kernel fpu code, in particular the overhead
for multiple consecutive in kernel fpu users is recuded
- Add a SIMD implementation for the RAID6 gen and xor operations
- Add RAID6 recovery based on the XC instruction
- The PCI DMA flush logic has been improved to increase the speed of
the map / unmap operations
- The time synchronization code has seen some updates
And bug fixes all over the place"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (48 commits)
s390/con3270: fix insufficient space padding
s390/con3270: fix use of uninitialised data
MAINTAINERS: update DASD maintainer
s390/cio: fix accidental interrupt enabling during resume
s390/dasd: add missing \n to end of dev_err messages
s390/config: Enable config options for Docker
s390/dasd: make query host access interruptible
s390/dasd: fix panic during offline processing
s390/dasd: fix hanging offline processing
s390/pci_dma: improve lazy flush for unmap
s390/pci_dma: split dma_update_trans
s390/pci_dma: improve map_sg
s390/pci_dma: simplify dma address calculation
s390/pci_dma: remove dma address range check
iommu/s390: simplify registration of I/O address translation parameters
s390: migrate exception table users off module.h and onto extable.h
s390: export header for CLP ioctl
s390/vmur: fix irq pointer dereference in int handler
s390/dasd: add missing KOBJ_CHANGE event for unformatted devices
s390: enable UBSAN
...
Diffstat (limited to 'lib/raid6/s390vx.uc')
-rw-r--r-- | lib/raid6/s390vx.uc | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/lib/raid6/s390vx.uc b/lib/raid6/s390vx.uc new file mode 100644 index 000000000000..7b45191a655f --- /dev/null +++ b/lib/raid6/s390vx.uc @@ -0,0 +1,168 @@ +/* + * raid6_vx$#.c + * + * $#-way unrolled RAID6 gen/xor functions for s390 + * based on the vector facility + * + * Copyright IBM Corp. 2016 + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> + * + * This file is postprocessed using unroll.awk. + */ + +#include <linux/raid/pq.h> +#include <asm/fpu/api.h> + +asm(".include \"asm/vx-insn.h\"\n"); + +#define NSIZE 16 + +static inline void LOAD_CONST(void) +{ + asm volatile("VREPIB %v24,7"); + asm volatile("VREPIB %v25,0x1d"); +} + +/* + * The SHLBYTE() operation shifts each of the 16 bytes in + * vector register y left by 1 bit and stores the result in + * vector register x. + */ +static inline void SHLBYTE(int x, int y) +{ + asm volatile ("VAB %0,%1,%1" : : "i" (x), "i" (y)); +} + +/* + * For each of the 16 bytes in the vector register y the MASK() + * operation returns 0xFF if the high bit of the byte is 1, + * or 0x00 if the high bit is 0. The result is stored in vector + * register x. + */ +static inline void MASK(int x, int y) +{ + asm volatile ("VESRAVB %0,%1,24" : : "i" (x), "i" (y)); +} + +static inline void AND(int x, int y, int z) +{ + asm volatile ("VN %0,%1,%2" : : "i" (x), "i" (y), "i" (z)); +} + +static inline void XOR(int x, int y, int z) +{ + asm volatile ("VX %0,%1,%2" : : "i" (x), "i" (y), "i" (z)); +} + +static inline void LOAD_DATA(int x, int n, u8 *ptr) +{ + typedef struct { u8 _[16*n]; } addrtype; + register addrtype *__ptr asm("1") = (addrtype *) ptr; + + asm volatile ("VLM %2,%3,0,%r1" + : : "m" (*__ptr), "a" (__ptr), "i" (x), "i" (x + n - 1)); +} + +static inline void STORE_DATA(int x, int n, u8 *ptr) +{ + typedef struct { u8 _[16*n]; } addrtype; + register addrtype *__ptr asm("1") = (addrtype *) ptr; + + asm volatile ("VSTM %2,%3,0,1" + : "=m" (*__ptr) : "a" (__ptr), "i" (x), "i" (x + n - 1)); +} + +static inline void COPY_VEC(int x, int y) +{ + asm volatile ("VLR %0,%1" : : "i" (x), "i" (y)); +} + +static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs) +{ + struct kernel_fpu vxstate; + u8 **dptr, *p, *q; + int d, z, z0; + + kernel_fpu_begin(&vxstate, KERNEL_VXR); + LOAD_CONST(); + + dptr = (u8 **) ptrs; + z0 = disks - 3; /* Highest data disk */ + p = dptr[z0 + 1]; /* XOR parity */ + q = dptr[z0 + 2]; /* RS syndrome */ + + for (d = 0; d < bytes; d += $#*NSIZE) { + LOAD_DATA(0,$#,&dptr[z0][d]); + COPY_VEC(8+$$,0+$$); + for (z = z0 - 1; z >= 0; z--) { + MASK(16+$$,8+$$); + AND(16+$$,16+$$,25); + SHLBYTE(8+$$,8+$$); + XOR(8+$$,8+$$,16+$$); + LOAD_DATA(16,$#,&dptr[z][d]); + XOR(0+$$,0+$$,16+$$); + XOR(8+$$,8+$$,16+$$); + } + STORE_DATA(0,$#,&p[d]); + STORE_DATA(8,$#,&q[d]); + } + kernel_fpu_end(&vxstate, KERNEL_VXR); +} + +static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop, + size_t bytes, void **ptrs) +{ + struct kernel_fpu vxstate; + u8 **dptr, *p, *q; + int d, z, z0; + + dptr = (u8 **) ptrs; + z0 = stop; /* P/Q right side optimization */ + p = dptr[disks - 2]; /* XOR parity */ + q = dptr[disks - 1]; /* RS syndrome */ + + kernel_fpu_begin(&vxstate, KERNEL_VXR); + LOAD_CONST(); + + for (d = 0; d < bytes; d += $#*NSIZE) { + /* P/Q data pages */ + LOAD_DATA(0,$#,&dptr[z0][d]); + COPY_VEC(8+$$,0+$$); + for (z = z0 - 1; z >= start; z--) { + MASK(16+$$,8+$$); + AND(16+$$,16+$$,25); + SHLBYTE(8+$$,8+$$); + XOR(8+$$,8+$$,16+$$); + LOAD_DATA(16,$#,&dptr[z][d]); + XOR(0+$$,0+$$,16+$$); + XOR(8+$$,8+$$,16+$$); + } + /* P/Q left side optimization */ + for (z = start - 1; z >= 0; z--) { + MASK(16+$$,8+$$); + AND(16+$$,16+$$,25); + SHLBYTE(8+$$,8+$$); + XOR(8+$$,8+$$,16+$$); + } + LOAD_DATA(16,$#,&p[d]); + XOR(16+$$,16+$$,0+$$); + STORE_DATA(16,$#,&p[d]); + LOAD_DATA(16,$#,&q[d]); + XOR(16+$$,16+$$,8+$$); + STORE_DATA(16,$#,&q[d]); + } + kernel_fpu_end(&vxstate, KERNEL_VXR); +} + +static int raid6_s390vx$#_valid(void) +{ + return MACHINE_HAS_VX; +} + +const struct raid6_calls raid6_s390vx$# = { + raid6_s390vx$#_gen_syndrome, + raid6_s390vx$#_xor_syndrome, + raid6_s390vx$#_valid, + "vx128x$#", + 1 +}; |