diff options
| -rw-r--r-- | arch/riscv/errata/thead/errata.c | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/cacheflush.h | 1 | ||||
| -rw-r--r-- | arch/riscv/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/riscv/mm/dma-noncoherent.c | 23 |
4 files changed, 16 insertions, 11 deletions
diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c index 202c83f677b2..96648c176f37 100644 --- a/arch/riscv/errata/thead/errata.c +++ b/arch/riscv/errata/thead/errata.c @@ -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 diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h index a60acaecfeda..a89c005b4bbf 100644 --- a/arch/riscv/include/asm/cacheflush.h +++ b/arch/riscv/include/asm/cacheflush.h @@ -43,6 +43,7 @@ void flush_icache_mm(struct mm_struct *mm, bool local); #endif /* CONFIG_SMP */ #ifdef CONFIG_RISCV_ISA_ZICBOM +extern unsigned int riscv_cbom_block_size; void riscv_init_cbom_blocksize(void); #else static inline void riscv_init_cbom_blocksize(void) { } diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 95ef6e2bf45c..2dfc463b86bb 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -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(); } diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c index cd2225304c82..e3f9bdf47c5f 100644 --- a/arch/riscv/mm/dma-noncoherent.c +++ b/arch/riscv/mm/dma-noncoherent.c @@ -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; } |