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Merge patch series "riscv: errata: thead: use riscv_nonstd_cache_ops for CMO"

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Jisheng Zhang <jszhang@kernel.org> says:

Previously, we use alternative mechanism to dynamically patch
the CMO operations for THEAD C906/C910 during boot for performance
reason. But as pointed out by Arnd, "there is already a significant
cost in accessing the invalidated cache lines afterwards, which is
likely going to be much higher than the cost of an indirect branch".
And indeed, there's no performance difference with GMAC and EMMC per
my test on Sipeed Lichee Pi 4A board.

Use riscv_nonstd_cache_ops for THEAD C906/C910 CMO to simplify
the alternative code, and to acchieve Arnd's goal -- "I think
moving the THEAD ops at the same level as all nonstandard operations
makes sense, but I'd still leave CMO as an explicit fast path that
avoids the indirect branch. This seems like the right thing to do both
for readability and for platforms on which the indirect branch has a
noticeable overhead."

To make bisect easy, I use two patches here: patch1 does the conversion
which just mimics current CMO behavior via. riscv_nonstd_cache_ops, I
assume no functionalities changes. patch2 uses T-HEAD PA based CMO
instructions so that we don't need to covert PA to VA.

* b4-shazam-merge:
  riscv: errata: thead: use pa based instructions for CMO
  riscv: errata: thead: use riscv_nonstd_cache_ops for CMO

Link: https://lore.kernel.org/r/20231114143338.2406-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2024-01-10 09:54:29 -08:00
commit 2e605741e9
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
3 changed files with 74 additions and 46 deletions
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1
arch/riscv/Kconfig.errata
View File

@ -79,6 +79,7 @@ config ERRATA_THEAD_CMO
depends on ERRATA_THEAD && MMU
select DMA_DIRECT_REMAP
select RISCV_DMA_NONCOHERENT
select RISCV_NONSTANDARD_CACHE_OPS
default y
help
This will apply the cache management errata to handle the

69
arch/riscv/errata/thead/errata.c
View File

@ -12,8 +12,10 @@
#include <asm/alternative.h>
#include <asm/cacheflush.h>
#include <asm/cpufeature.h>
#include <asm/dma-noncoherent.h>
#include <asm/errata_list.h>
#include <asm/hwprobe.h>
#include <asm/io.h>
#include <asm/patch.h>
#include <asm/vendorid_list.h>
@ -33,6 +35,69 @@ static bool errata_probe_pbmt(unsigned int stage,
return false;
}
/*
* th.dcache.ipa rs1 (invalidate, physical address)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000001 01010 rs1 000 00000 0001011
* th.dcache.iva rs1 (invalidate, virtual address)
* 0000001 00110 rs1 000 00000 0001011
*
* th.dcache.cpa rs1 (clean, physical address)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000001 01001 rs1 000 00000 0001011
* th.dcache.cva rs1 (clean, virtual address)
* 0000001 00101 rs1 000 00000 0001011
*
* th.dcache.cipa rs1 (clean then invalidate, physical address)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000001 01011 rs1 000 00000 0001011
* th.dcache.civa rs1 (clean then invalidate, virtual address)
* 0000001 00111 rs1 000 00000 0001011
*
* th.sync.s (make sure all cache operations finished)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000000 11001 00000 000 00000 0001011
*/
#define THEAD_INVAL_A0 ".long 0x02a5000b"
#define THEAD_CLEAN_A0 ".long 0x0295000b"
#define THEAD_FLUSH_A0 ".long 0x02b5000b"
#define THEAD_SYNC_S ".long 0x0190000b"
#define THEAD_CMO_OP(_op, _start, _size, _cachesize) \
asm volatile("mv a0, %1\n\t" \
"j 2f\n\t" \
"3:\n\t" \
THEAD_##_op##_A0 "\n\t" \
"add a0, a0, %0\n\t" \
"2:\n\t" \
"bltu a0, %2, 3b\n\t" \
THEAD_SYNC_S \
: : "r"(_cachesize), \
"r"((unsigned long)(_start) & ~((_cachesize) - 1UL)), \
"r"((unsigned long)(_start) + (_size)) \
: "a0")
static void thead_errata_cache_inv(phys_addr_t paddr, size_t size)
{
THEAD_CMO_OP(INVAL, paddr, size, riscv_cbom_block_size);
}
static void thead_errata_cache_wback(phys_addr_t paddr, size_t size)
{
THEAD_CMO_OP(CLEAN, paddr, size, riscv_cbom_block_size);
}
static void thead_errata_cache_wback_inv(phys_addr_t paddr, size_t size)
{
THEAD_CMO_OP(FLUSH, paddr, size, riscv_cbom_block_size);
}
static const struct riscv_nonstd_cache_ops thead_errata_cmo_ops = {
.wback = &thead_errata_cache_wback,
.inv = &thead_errata_cache_inv,
.wback_inv = &thead_errata_cache_wback_inv,
};
static bool errata_probe_cmo(unsigned int stage,
unsigned long arch_id, unsigned long impid)
{
@ -48,6 +113,7 @@ static bool errata_probe_cmo(unsigned int stage,
if (stage == RISCV_ALTERNATIVES_BOOT) {
riscv_cbom_block_size = L1_CACHE_BYTES;
riscv_noncoherent_supported();
riscv_noncoherent_register_cache_ops(&thead_errata_cmo_ops);
}
return true;
@ -77,8 +143,7 @@ static u32 thead_errata_probe(unsigned int stage,
if (errata_probe_pbmt(stage, archid, impid))
cpu_req_errata |= BIT(ERRATA_THEAD_PBMT);
if (errata_probe_cmo(stage, archid, impid))
cpu_req_errata |= BIT(ERRATA_THEAD_CMO);
errata_probe_cmo(stage, archid, impid);
if (errata_probe_pmu(stage, archid, impid))
cpu_req_errata |= BIT(ERRATA_THEAD_PMU);

50
arch/riscv/include/asm/errata_list.h
View File

@ -24,9 +24,8 @@
#ifdef CONFIG_ERRATA_THEAD
#define ERRATA_THEAD_PBMT 0
#define ERRATA_THEAD_CMO 1
#define ERRATA_THEAD_PMU 2
#define ERRATA_THEAD_NUMBER 3
#define ERRATA_THEAD_PMU 1
#define ERRATA_THEAD_NUMBER 2
#endif
#ifdef __ASSEMBLY__
@ -94,54 +93,17 @@ asm volatile(ALTERNATIVE( \
#define ALT_THEAD_PMA(_val)
#endif
/*
* th.dcache.ipa rs1 (invalidate, physical address)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000001 01010 rs1 000 00000 0001011
* th.dache.iva rs1 (invalida, virtual address)
* 0000001 00110 rs1 000 00000 0001011
*
* th.dcache.cpa rs1 (clean, physical address)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000001 01001 rs1 000 00000 0001011
* th.dcache.cva rs1 (clean, virtual address)
* 0000001 00101 rs1 000 00000 0001011
*
* th.dcache.cipa rs1 (clean then invalidate, physical address)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000001 01011 rs1 000 00000 0001011
* th.dcache.civa rs1 (... virtual address)
* 0000001 00111 rs1 000 00000 0001011
*
* th.sync.s (make sure all cache operations finished)
* | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 |
* 0000000 11001 00000 000 00000 0001011
*/
#define THEAD_INVAL_A0 ".long 0x0265000b"
#define THEAD_CLEAN_A0 ".long 0x0255000b"
#define THEAD_FLUSH_A0 ".long 0x0275000b"
#define THEAD_SYNC_S ".long 0x0190000b"
#define ALT_CMO_OP(_op, _start, _size, _cachesize) \
asm volatile(ALTERNATIVE_2( \
__nops(6), \
asm volatile(ALTERNATIVE( \
__nops(5), \
"mv a0, %1\n\t" \
"j 2f\n\t" \
"3:\n\t" \
CBO_##_op(a0) \
"add a0, a0, %0\n\t" \
"2:\n\t" \
"bltu a0, %2, 3b\n\t" \
"nop", 0, RISCV_ISA_EXT_ZICBOM, CONFIG_RISCV_ISA_ZICBOM, \
"mv a0, %1\n\t" \
"j 2f\n\t" \
"3:\n\t" \
THEAD_##_op##_A0 "\n\t" \
"add a0, a0, %0\n\t" \
"2:\n\t" \
"bltu a0, %2, 3b\n\t" \
THEAD_SYNC_S, THEAD_VENDOR_ID, \
ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO) \
"bltu a0, %2, 3b\n\t", \
0, RISCV_ISA_EXT_ZICBOM, CONFIG_RISCV_ISA_ZICBOM) \
: : "r"(_cachesize), \
"r"((unsigned long)(_start) & ~((_cachesize) - 1UL)), \
"r"((unsigned long)(_start) + (_size)) \