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RISC-V Fixes for 6.0-rc7

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* A handful of build fixes for the T-Head errata, including some
   functional issues the compilers found.
 * A fix for a nasty sigreturn bug.
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Merge tag 'riscv-for-linus-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:

 - A handful of build fixes for the T-Head errata, including some
   functional issues the compilers found

 - A fix for a nasty sigreturn bug

* tag 'riscv-for-linus-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  RISC-V: Avoid coupling the T-Head CMOs and Zicbom
  riscv: fix a nasty sigreturn bug...
  riscv: make t-head erratas depend on MMU
  riscv: fix RISCV_ISA_SVPBMT kconfig dependency warning
  RISC-V: Clean up the Zicbom block size probing
This commit is contained in:
Linus Torvalds 2022-09-23 08:51:05 -07:00
commit a7b7751aeb
7 changed files with 25 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/riscv/Kconfig
View File

@ -386,6 +386,7 @@ config RISCV_ISA_C
config RISCV_ISA_SVPBMT
bool "SVPBMT extension support"
depends on 64BIT && MMU
depends on !XIP_KERNEL
select RISCV_ALTERNATIVE
default y
help

4
arch/riscv/Kconfig.erratas
View File

@ -46,7 +46,7 @@ config ERRATA_THEAD
config ERRATA_THEAD_PBMT
bool "Apply T-Head memory type errata"
depends on ERRATA_THEAD && 64BIT
depends on ERRATA_THEAD && 64BIT && MMU
select RISCV_ALTERNATIVE_EARLY
default y
help
@ -57,7 +57,7 @@ config ERRATA_THEAD_PBMT
config ERRATA_THEAD_CMO
bool "Apply T-Head cache management errata"
depends on ERRATA_THEAD
depends on ERRATA_THEAD && MMU
select RISCV_DMA_NONCOHERENT
default y
help

1
arch/riscv/errata/thead/errata.c
View File

@ -37,6 +37,7 @@ static bool errata_probe_cmo(unsigned int stage,
if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
return false;
riscv_cbom_block_size = L1_CACHE_BYTES;
riscv_noncoherent_supported();
return true;
#else

5
arch/riscv/include/asm/cacheflush.h
View File

@ -42,6 +42,11 @@ void flush_icache_mm(struct mm_struct *mm, bool local);
#endif /* CONFIG_SMP */
/*
* The T-Head CMO errata internally probe the CBOM block size, but otherwise
* don't depend on Zicbom.
*/
extern unsigned int riscv_cbom_block_size;
#ifdef CONFIG_RISCV_ISA_ZICBOM
void riscv_init_cbom_blocksize(void);
#else

2
arch/riscv/kernel/setup.c
View File

@ -296,8 +296,8 @@ void __init setup_arch(char **cmdline_p)
setup_smp();
#endif
riscv_fill_hwcap();
riscv_init_cbom_blocksize();
riscv_fill_hwcap();
apply_boot_alternatives();
}

2
arch/riscv/kernel/signal.c
View File

@ -124,6 +124,8 @@ SYSCALL_DEFINE0(rt_sigreturn)
if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
regs->cause = -1UL;
return regs->a0;
badframe:

23
arch/riscv/mm/dma-noncoherent.c
View File

@ -12,7 +12,7 @@
#include <linux/of_device.h>
#include <asm/cacheflush.h>
static unsigned int riscv_cbom_block_size = L1_CACHE_BYTES;
unsigned int riscv_cbom_block_size;
static bool noncoherent_supported;
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
@ -79,38 +79,41 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
void riscv_init_cbom_blocksize(void)
{
struct device_node *node;
unsigned long cbom_hartid;
u32 val, probed_block_size;
int ret;
u32 val;
probed_block_size = 0;
for_each_of_cpu_node(node) {
unsigned long hartid;
int cbom_hartid;
ret = riscv_of_processor_hartid(node, &hartid);
if (ret)
continue;
if (hartid < 0)
continue;
/* set block-size for cbom extension if available */
ret = of_property_read_u32(node, "riscv,cbom-block-size", &val);
if (ret)
continue;
if (!riscv_cbom_block_size) {
riscv_cbom_block_size = val;
if (!probed_block_size) {
probed_block_size = val;
cbom_hartid = hartid;
} else {
if (riscv_cbom_block_size != val)
pr_warn("cbom-block-size mismatched between harts %d and %lu\n",
if (probed_block_size != val)
pr_warn("cbom-block-size mismatched between harts %lu and %lu\n",
cbom_hartid, hartid);
}
}
if (probed_block_size)
riscv_cbom_block_size = probed_block_size;
}
#endif
void riscv_noncoherent_supported(void)
{
WARN(!riscv_cbom_block_size,
"Non-coherent DMA support enabled without a block size\n");
noncoherent_supported = true;
}