| Message ID | 20221013134217.1850349-1-ajones@ventanamicro.com |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v2] RISC-V: KVM: Fix compilation without RISCV_ISA_ZICBOM | expand |
On Thu, Oct 13, 2022 at 7:12 PM Andrew Jones <ajones@ventanamicro.com> wrote: > > riscv_cbom_block_size and riscv_init_cbom_blocksize() should always > be available and riscv_init_cbom_blocksize() should always be > invoked, even when compiling without RISCV_ISA_ZICBOM enabled. This > is because disabling RISCV_ISA_ZICBOM means "don't use zicbom > instructions in the kernel" not "pretend there isn't zicbom, even > when there is". When zicbom is available, whether the kernel enables > its use with RISCV_ISA_ZICBOM or not, KVM will offer it to guests. > Ensure we can build KVM and that the block size is initialized even > when compiling without RISCV_ISA_ZICBOM. > > Fixes: 8f7e001e0325 ("RISC-V: Clean up the Zicbom block size probing") > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> This is quite similar to the code movement patch I had in the PMEM series. Looks good to me. Reviewed-by: Anup Patel <anup@brainfault.org> @Palmer, let me know if you are okay with this going through the KVM tree. Regards, Anup > --- > arch/riscv/include/asm/cacheflush.h | 8 ------ > arch/riscv/mm/cacheflush.c | 38 ++++++++++++++++++++++++++ > arch/riscv/mm/dma-noncoherent.c | 41 ----------------------------- > 3 files changed, 38 insertions(+), 49 deletions(-) > > diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h > index 273ece6b622f..1470e556cdb1 100644 > --- a/arch/riscv/include/asm/cacheflush.h > +++ b/arch/riscv/include/asm/cacheflush.h > @@ -42,16 +42,8 @@ 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 > -static inline void riscv_init_cbom_blocksize(void) { } > -#endif > > #ifdef CONFIG_RISCV_DMA_NONCOHERENT > void riscv_noncoherent_supported(void); > diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c > index 6cb7d96ad9c7..8525f4a2d598 100644 > --- a/arch/riscv/mm/cacheflush.c > +++ b/arch/riscv/mm/cacheflush.c > @@ -3,6 +3,7 @@ > * Copyright (C) 2017 SiFive > */ > > +#include <linux/of.h> > #include <asm/cacheflush.h> > > #ifdef CONFIG_SMP > @@ -86,3 +87,40 @@ void flush_icache_pte(pte_t pte) > flush_icache_all(); > } > #endif /* CONFIG_MMU */ > + > +unsigned int riscv_cbom_block_size; > +EXPORT_SYMBOL(riscv_cbom_block_size); > + > +void riscv_init_cbom_blocksize(void) > +{ > + struct device_node *node; > + unsigned long cbom_hartid; > + u32 val, probed_block_size; > + int ret; > + > + probed_block_size = 0; > + for_each_of_cpu_node(node) { > + unsigned long hartid; > + > + ret = riscv_of_processor_hartid(node, &hartid); > + if (ret) > + continue; > + > + /* set block-size for cbom extension if available */ > + ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > + if (ret) > + continue; > + > + if (!probed_block_size) { > + probed_block_size = val; > + cbom_hartid = hartid; > + } else { > + 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; > +} > diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c > index b0add983530a..d919efab6eba 100644 > --- a/arch/riscv/mm/dma-noncoherent.c > +++ b/arch/riscv/mm/dma-noncoherent.c > @@ -8,13 +8,8 @@ > #include <linux/dma-direct.h> > #include <linux/dma-map-ops.h> > #include <linux/mm.h> > -#include <linux/of.h> > -#include <linux/of_device.h> > #include <asm/cacheflush.h> > > -unsigned int riscv_cbom_block_size; > -EXPORT_SYMBOL_GPL(riscv_cbom_block_size); > - > static bool noncoherent_supported; > > void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, > @@ -77,42 +72,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, > dev->dma_coherent = coherent; > } > > -#ifdef CONFIG_RISCV_ISA_ZICBOM > -void riscv_init_cbom_blocksize(void) > -{ > - struct device_node *node; > - unsigned long cbom_hartid; > - u32 val, probed_block_size; > - int ret; > - > - probed_block_size = 0; > - for_each_of_cpu_node(node) { > - unsigned long hartid; > - > - ret = riscv_of_processor_hartid(node, &hartid); > - if (ret) > - continue; > - > - /* set block-size for cbom extension if available */ > - ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > - if (ret) > - continue; > - > - if (!probed_block_size) { > - probed_block_size = val; > - cbom_hartid = hartid; > - } else { > - 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, > -- > 2.37.3 >
On Thu, Oct 13, 2022 at 03:42:17PM +0200, Andrew Jones wrote: > riscv_cbom_block_size and riscv_init_cbom_blocksize() should always > be available and riscv_init_cbom_blocksize() should always be > invoked, even when compiling without RISCV_ISA_ZICBOM enabled. This > is because disabling RISCV_ISA_ZICBOM means "don't use zicbom > instructions in the kernel" not "pretend there isn't zicbom, even > when there is". When zicbom is available, whether the kernel enables > its use with RISCV_ISA_ZICBOM or not, KVM will offer it to guests. > Ensure we can build KVM and that the block size is initialized even > when compiling without RISCV_ISA_ZICBOM. > > Fixes: 8f7e001e0325 ("RISC-V: Clean up the Zicbom block size probing") > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> > --- Grr... Second time I forgot my changelog on a patch this week... v2: - Instead of #ifdefing the use of riscv_cbom_block_size in KVM always expose it by moving it to cacheflush.c and change Fixes commit. [Palmer] - Move riscv_init_cbom_blocksize() to cacheflush.c and always expose it since KVM can offer zicbom to guests even if the host kernel chooses not to use it (RISCV_ISA_ZICBOM=n) [drew] - Rewrote commit message > arch/riscv/include/asm/cacheflush.h | 8 ------ > arch/riscv/mm/cacheflush.c | 38 ++++++++++++++++++++++++++ > arch/riscv/mm/dma-noncoherent.c | 41 ----------------------------- > 3 files changed, 38 insertions(+), 49 deletions(-) > > diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h > index 273ece6b622f..1470e556cdb1 100644 > --- a/arch/riscv/include/asm/cacheflush.h > +++ b/arch/riscv/include/asm/cacheflush.h > @@ -42,16 +42,8 @@ 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 > -static inline void riscv_init_cbom_blocksize(void) { } > -#endif > > #ifdef CONFIG_RISCV_DMA_NONCOHERENT > void riscv_noncoherent_supported(void); > diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c > index 6cb7d96ad9c7..8525f4a2d598 100644 > --- a/arch/riscv/mm/cacheflush.c > +++ b/arch/riscv/mm/cacheflush.c > @@ -3,6 +3,7 @@ > * Copyright (C) 2017 SiFive > */ > > +#include <linux/of.h> > #include <asm/cacheflush.h> > > #ifdef CONFIG_SMP > @@ -86,3 +87,40 @@ void flush_icache_pte(pte_t pte) > flush_icache_all(); > } > #endif /* CONFIG_MMU */ > + > +unsigned int riscv_cbom_block_size; > +EXPORT_SYMBOL(riscv_cbom_block_size); > + > +void riscv_init_cbom_blocksize(void) > +{ > + struct device_node *node; > + unsigned long cbom_hartid; > + u32 val, probed_block_size; > + int ret; > + > + probed_block_size = 0; > + for_each_of_cpu_node(node) { > + unsigned long hartid; > + > + ret = riscv_of_processor_hartid(node, &hartid); > + if (ret) > + continue; > + > + /* set block-size for cbom extension if available */ > + ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > + if (ret) > + continue; > + > + if (!probed_block_size) { > + probed_block_size = val; > + cbom_hartid = hartid; > + } else { > + 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; > +} > diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c > index b0add983530a..d919efab6eba 100644 > --- a/arch/riscv/mm/dma-noncoherent.c > +++ b/arch/riscv/mm/dma-noncoherent.c > @@ -8,13 +8,8 @@ > #include <linux/dma-direct.h> > #include <linux/dma-map-ops.h> > #include <linux/mm.h> > -#include <linux/of.h> > -#include <linux/of_device.h> > #include <asm/cacheflush.h> > > -unsigned int riscv_cbom_block_size; > -EXPORT_SYMBOL_GPL(riscv_cbom_block_size); > - > static bool noncoherent_supported; > > void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, > @@ -77,42 +72,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, > dev->dma_coherent = coherent; > } > > -#ifdef CONFIG_RISCV_ISA_ZICBOM > -void riscv_init_cbom_blocksize(void) > -{ > - struct device_node *node; > - unsigned long cbom_hartid; > - u32 val, probed_block_size; > - int ret; > - > - probed_block_size = 0; > - for_each_of_cpu_node(node) { > - unsigned long hartid; > - > - ret = riscv_of_processor_hartid(node, &hartid); > - if (ret) > - continue; > - > - /* set block-size for cbom extension if available */ > - ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > - if (ret) > - continue; > - > - if (!probed_block_size) { > - probed_block_size = val; > - cbom_hartid = hartid; > - } else { > - 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, > -- > 2.37.3 >
On Thu, Oct 13, 2022 at 03:42:17PM +0200, Andrew Jones wrote: > RISC-V: KVM: Fix compilation without RISCV_ISA_ZICBOM nit: I know that this is what it fixes, but I think the commit subject is a little misleading when it doesnt touch arch/riscv/kvm & has some meaning for non-kvm too. > riscv_cbom_block_size and riscv_init_cbom_blocksize() should always > be available and riscv_init_cbom_blocksize() should always be invoked Yup, I like where this is going... > even when compiling without RISCV_ISA_ZICBOM enabled. This > is because disabling RISCV_ISA_ZICBOM means "don't use zicbom > instructions in the kernel" not "pretend there isn't zicbom, even > when there is". When zicbom is available, whether the kernel enables > its use with RISCV_ISA_ZICBOM or not, KVM will offer it to guests. ...right, I'll take your word for this part. You're the kvm people :) > Ensure we can build KVM and that the block size is initialized even > when compiling without RISCV_ISA_ZICBOM. > > Fixes: 8f7e001e0325 ("RISC-V: Clean up the Zicbom block size probing") > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Is cacheflush.c the "right" place for it? idk. But shaving that yak is a waste of time imo. I like the unconditional availability & if ZICBOM is off in the kernel I figure it should not matter that we set the blocksize. Reviewed-by: Conor Dooley <conor.dooley@microchip.com> > --- > arch/riscv/include/asm/cacheflush.h | 8 ------ > arch/riscv/mm/cacheflush.c | 38 ++++++++++++++++++++++++++ > arch/riscv/mm/dma-noncoherent.c | 41 ----------------------------- > 3 files changed, 38 insertions(+), 49 deletions(-) > > diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h > index 273ece6b622f..1470e556cdb1 100644 > --- a/arch/riscv/include/asm/cacheflush.h > +++ b/arch/riscv/include/asm/cacheflush.h > @@ -42,16 +42,8 @@ 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 > -static inline void riscv_init_cbom_blocksize(void) { } > -#endif > > #ifdef CONFIG_RISCV_DMA_NONCOHERENT > void riscv_noncoherent_supported(void); > diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c > index 6cb7d96ad9c7..8525f4a2d598 100644 > --- a/arch/riscv/mm/cacheflush.c > +++ b/arch/riscv/mm/cacheflush.c > @@ -3,6 +3,7 @@ > * Copyright (C) 2017 SiFive > */ > > +#include <linux/of.h> > #include <asm/cacheflush.h> > > #ifdef CONFIG_SMP > @@ -86,3 +87,40 @@ void flush_icache_pte(pte_t pte) > flush_icache_all(); > } > #endif /* CONFIG_MMU */ > + > +unsigned int riscv_cbom_block_size; > +EXPORT_SYMBOL(riscv_cbom_block_size); > + > +void riscv_init_cbom_blocksize(void) > +{ > + struct device_node *node; > + unsigned long cbom_hartid; > + u32 val, probed_block_size; > + int ret; > + > + probed_block_size = 0; > + for_each_of_cpu_node(node) { > + unsigned long hartid; > + > + ret = riscv_of_processor_hartid(node, &hartid); > + if (ret) > + continue; > + > + /* set block-size for cbom extension if available */ > + ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > + if (ret) > + continue; > + > + if (!probed_block_size) { > + probed_block_size = val; > + cbom_hartid = hartid; > + } else { > + 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; > +} > diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c > index b0add983530a..d919efab6eba 100644 > --- a/arch/riscv/mm/dma-noncoherent.c > +++ b/arch/riscv/mm/dma-noncoherent.c > @@ -8,13 +8,8 @@ > #include <linux/dma-direct.h> > #include <linux/dma-map-ops.h> > #include <linux/mm.h> > -#include <linux/of.h> > -#include <linux/of_device.h> > #include <asm/cacheflush.h> > > -unsigned int riscv_cbom_block_size; > -EXPORT_SYMBOL_GPL(riscv_cbom_block_size); > - > static bool noncoherent_supported; > > void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, > @@ -77,42 +72,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, > dev->dma_coherent = coherent; > } > > -#ifdef CONFIG_RISCV_ISA_ZICBOM > -void riscv_init_cbom_blocksize(void) > -{ > - struct device_node *node; > - unsigned long cbom_hartid; > - u32 val, probed_block_size; > - int ret; > - > - probed_block_size = 0; > - for_each_of_cpu_node(node) { > - unsigned long hartid; > - > - ret = riscv_of_processor_hartid(node, &hartid); > - if (ret) > - continue; > - > - /* set block-size for cbom extension if available */ > - ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > - if (ret) > - continue; > - > - if (!probed_block_size) { > - probed_block_size = val; > - cbom_hartid = hartid; > - } else { > - 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, > -- > 2.37.3 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
On Thu, Oct 13, 2022 at 03:21:06PM +0100, Conor Dooley wrote: > On Thu, Oct 13, 2022 at 03:42:17PM +0200, Andrew Jones wrote: > > > RISC-V: KVM: Fix compilation without RISCV_ISA_ZICBOM > > nit: I know that this is what it fixes, but I think the commit subject > is a little misleading when it doesnt touch arch/riscv/kvm & has some > meaning for non-kvm too. Yeah, in hindsight I probably should have just dropped the "RISC-V: KVM: Fix compilation without RISCV_ISA_ZICBOM" patch and rebased and resent Anup's move patch. I still can, if that's what people would prefer. Thanks, drew > > > riscv_cbom_block_size and riscv_init_cbom_blocksize() should always > > be available and riscv_init_cbom_blocksize() should always be invoked > > Yup, I like where this is going... > > > even when compiling without RISCV_ISA_ZICBOM enabled. This > > is because disabling RISCV_ISA_ZICBOM means "don't use zicbom > > instructions in the kernel" not "pretend there isn't zicbom, even > > when there is". When zicbom is available, whether the kernel enables > > its use with RISCV_ISA_ZICBOM or not, KVM will offer it to guests. > > ...right, I'll take your word for this part. You're the kvm people :) > > > Ensure we can build KVM and that the block size is initialized even > > when compiling without RISCV_ISA_ZICBOM. > > > > Fixes: 8f7e001e0325 ("RISC-V: Clean up the Zicbom block size probing") > > Reported-by: kernel test robot <lkp@intel.com> > > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> > > Is cacheflush.c the "right" place for it? idk. But shaving that yak is a > waste of time imo. I like the unconditional availability & if ZICBOM is > off in the kernel I figure it should not matter that we set the > blocksize. > > Reviewed-by: Conor Dooley <conor.dooley@microchip.com> > > > --- > > arch/riscv/include/asm/cacheflush.h | 8 ------ > > arch/riscv/mm/cacheflush.c | 38 ++++++++++++++++++++++++++ > > arch/riscv/mm/dma-noncoherent.c | 41 ----------------------------- > > 3 files changed, 38 insertions(+), 49 deletions(-) > > > > diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h > > index 273ece6b622f..1470e556cdb1 100644 > > --- a/arch/riscv/include/asm/cacheflush.h > > +++ b/arch/riscv/include/asm/cacheflush.h > > @@ -42,16 +42,8 @@ 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 > > -static inline void riscv_init_cbom_blocksize(void) { } > > -#endif > > > > #ifdef CONFIG_RISCV_DMA_NONCOHERENT > > void riscv_noncoherent_supported(void); > > diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c > > index 6cb7d96ad9c7..8525f4a2d598 100644 > > --- a/arch/riscv/mm/cacheflush.c > > +++ b/arch/riscv/mm/cacheflush.c > > @@ -3,6 +3,7 @@ > > * Copyright (C) 2017 SiFive > > */ > > > > +#include <linux/of.h> > > #include <asm/cacheflush.h> > > > > #ifdef CONFIG_SMP > > @@ -86,3 +87,40 @@ void flush_icache_pte(pte_t pte) > > flush_icache_all(); > > } > > #endif /* CONFIG_MMU */ > > + > > +unsigned int riscv_cbom_block_size; > > +EXPORT_SYMBOL(riscv_cbom_block_size); > > + > > +void riscv_init_cbom_blocksize(void) > > +{ > > + struct device_node *node; > > + unsigned long cbom_hartid; > > + u32 val, probed_block_size; > > + int ret; > > + > > + probed_block_size = 0; > > + for_each_of_cpu_node(node) { > > + unsigned long hartid; > > + > > + ret = riscv_of_processor_hartid(node, &hartid); > > + if (ret) > > + continue; > > + > > + /* set block-size for cbom extension if available */ > > + ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > > + if (ret) > > + continue; > > + > > + if (!probed_block_size) { > > + probed_block_size = val; > > + cbom_hartid = hartid; > > + } else { > > + 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; > > +} > > diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c > > index b0add983530a..d919efab6eba 100644 > > --- a/arch/riscv/mm/dma-noncoherent.c > > +++ b/arch/riscv/mm/dma-noncoherent.c > > @@ -8,13 +8,8 @@ > > #include <linux/dma-direct.h> > > #include <linux/dma-map-ops.h> > > #include <linux/mm.h> > > -#include <linux/of.h> > > -#include <linux/of_device.h> > > #include <asm/cacheflush.h> > > > > -unsigned int riscv_cbom_block_size; > > -EXPORT_SYMBOL_GPL(riscv_cbom_block_size); > > - > > static bool noncoherent_supported; > > > > void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, > > @@ -77,42 +72,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, > > dev->dma_coherent = coherent; > > } > > > > -#ifdef CONFIG_RISCV_ISA_ZICBOM > > -void riscv_init_cbom_blocksize(void) > > -{ > > - struct device_node *node; > > - unsigned long cbom_hartid; > > - u32 val, probed_block_size; > > - int ret; > > - > > - probed_block_size = 0; > > - for_each_of_cpu_node(node) { > > - unsigned long hartid; > > - > > - ret = riscv_of_processor_hartid(node, &hartid); > > - if (ret) > > - continue; > > - > > - /* set block-size for cbom extension if available */ > > - ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > > - if (ret) > > - continue; > > - > > - if (!probed_block_size) { > > - probed_block_size = val; > > - cbom_hartid = hartid; > > - } else { > > - 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, > > -- > > 2.37.3 > > > > > > _______________________________________________ > > linux-riscv mailing list > > linux-riscv@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/linux-riscv
On Thu, Oct 13, 2022 at 04:39:31PM +0200, Andrew Jones wrote: > On Thu, Oct 13, 2022 at 03:21:06PM +0100, Conor Dooley wrote: > > On Thu, Oct 13, 2022 at 03:42:17PM +0200, Andrew Jones wrote: > > > > > RISC-V: KVM: Fix compilation without RISCV_ISA_ZICBOM > > > > nit: I know that this is what it fixes, but I think the commit subject > > is a little misleading when it doesnt touch arch/riscv/kvm & has some > > meaning for non-kvm too. > > Yeah, in hindsight I probably should have just dropped the "RISC-V: KVM: > Fix compilation without RISCV_ISA_ZICBOM" patch and rebased and resent > Anup's move patch. I still can, if that's what people would prefer. I'd image that that can be done at application time? idk what I'd go for though, I am sick so my heads a little groggy. Say along the lines of "RISC-V: make cbom blocksize info unconditionally available"? Feel free to hate that Drew... Conor. > > Thanks, > drew > > > > > > > riscv_cbom_block_size and riscv_init_cbom_blocksize() should always > > > be available and riscv_init_cbom_blocksize() should always be invoked > > > > Yup, I like where this is going... > > > > > even when compiling without RISCV_ISA_ZICBOM enabled. This > > > is because disabling RISCV_ISA_ZICBOM means "don't use zicbom > > > instructions in the kernel" not "pretend there isn't zicbom, even > > > when there is". When zicbom is available, whether the kernel enables > > > its use with RISCV_ISA_ZICBOM or not, KVM will offer it to guests. > > > > ...right, I'll take your word for this part. You're the kvm people :) > > > > > Ensure we can build KVM and that the block size is initialized even > > > when compiling without RISCV_ISA_ZICBOM. > > > > > > Fixes: 8f7e001e0325 ("RISC-V: Clean up the Zicbom block size probing") > > > Reported-by: kernel test robot <lkp@intel.com> > > > Signed-off-by: Andrew Jones <ajones@ventanamicro.com> > > > > Is cacheflush.c the "right" place for it? idk. But shaving that yak is a > > waste of time imo. I like the unconditional availability & if ZICBOM is > > off in the kernel I figure it should not matter that we set the > > blocksize. > > > > Reviewed-by: Conor Dooley <conor.dooley@microchip.com> > > > > > --- > > > arch/riscv/include/asm/cacheflush.h | 8 ------ > > > arch/riscv/mm/cacheflush.c | 38 ++++++++++++++++++++++++++ > > > arch/riscv/mm/dma-noncoherent.c | 41 ----------------------------- > > > 3 files changed, 38 insertions(+), 49 deletions(-) > > > > > > diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h > > > index 273ece6b622f..1470e556cdb1 100644 > > > --- a/arch/riscv/include/asm/cacheflush.h > > > +++ b/arch/riscv/include/asm/cacheflush.h > > > @@ -42,16 +42,8 @@ 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 > > > -static inline void riscv_init_cbom_blocksize(void) { } > > > -#endif > > > > > > #ifdef CONFIG_RISCV_DMA_NONCOHERENT > > > void riscv_noncoherent_supported(void); > > > diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c > > > index 6cb7d96ad9c7..8525f4a2d598 100644 > > > --- a/arch/riscv/mm/cacheflush.c > > > +++ b/arch/riscv/mm/cacheflush.c > > > @@ -3,6 +3,7 @@ > > > * Copyright (C) 2017 SiFive > > > */ > > > > > > +#include <linux/of.h> > > > #include <asm/cacheflush.h> > > > > > > #ifdef CONFIG_SMP > > > @@ -86,3 +87,40 @@ void flush_icache_pte(pte_t pte) > > > flush_icache_all(); > > > } > > > #endif /* CONFIG_MMU */ > > > + > > > +unsigned int riscv_cbom_block_size; > > > +EXPORT_SYMBOL(riscv_cbom_block_size); > > > + > > > +void riscv_init_cbom_blocksize(void) > > > +{ > > > + struct device_node *node; > > > + unsigned long cbom_hartid; > > > + u32 val, probed_block_size; > > > + int ret; > > > + > > > + probed_block_size = 0; > > > + for_each_of_cpu_node(node) { > > > + unsigned long hartid; > > > + > > > + ret = riscv_of_processor_hartid(node, &hartid); > > > + if (ret) > > > + continue; > > > + > > > + /* set block-size for cbom extension if available */ > > > + ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > > > + if (ret) > > > + continue; > > > + > > > + if (!probed_block_size) { > > > + probed_block_size = val; > > > + cbom_hartid = hartid; > > > + } else { > > > + 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; > > > +} > > > diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c > > > index b0add983530a..d919efab6eba 100644 > > > --- a/arch/riscv/mm/dma-noncoherent.c > > > +++ b/arch/riscv/mm/dma-noncoherent.c > > > @@ -8,13 +8,8 @@ > > > #include <linux/dma-direct.h> > > > #include <linux/dma-map-ops.h> > > > #include <linux/mm.h> > > > -#include <linux/of.h> > > > -#include <linux/of_device.h> > > > #include <asm/cacheflush.h> > > > > > > -unsigned int riscv_cbom_block_size; > > > -EXPORT_SYMBOL_GPL(riscv_cbom_block_size); > > > - > > > static bool noncoherent_supported; > > > > > > void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, > > > @@ -77,42 +72,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, > > > dev->dma_coherent = coherent; > > > } > > > > > > -#ifdef CONFIG_RISCV_ISA_ZICBOM > > > -void riscv_init_cbom_blocksize(void) > > > -{ > > > - struct device_node *node; > > > - unsigned long cbom_hartid; > > > - u32 val, probed_block_size; > > > - int ret; > > > - > > > - probed_block_size = 0; > > > - for_each_of_cpu_node(node) { > > > - unsigned long hartid; > > > - > > > - ret = riscv_of_processor_hartid(node, &hartid); > > > - if (ret) > > > - continue; > > > - > > > - /* set block-size for cbom extension if available */ > > > - ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); > > > - if (ret) > > > - continue; > > > - > > > - if (!probed_block_size) { > > > - probed_block_size = val; > > > - cbom_hartid = hartid; > > > - } else { > > > - 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, > > > -- > > > 2.37.3 > > > > > > > > > _______________________________________________ > > > linux-riscv mailing list > > > linux-riscv@lists.infradead.org > > > http://lists.infradead.org/mailman/listinfo/linux-riscv > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h index 273ece6b622f..1470e556cdb1 100644 --- a/arch/riscv/include/asm/cacheflush.h +++ b/arch/riscv/include/asm/cacheflush.h @@ -42,16 +42,8 @@ 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 -static inline void riscv_init_cbom_blocksize(void) { } -#endif #ifdef CONFIG_RISCV_DMA_NONCOHERENT void riscv_noncoherent_supported(void); diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index 6cb7d96ad9c7..8525f4a2d598 100644 --- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -3,6 +3,7 @@ * Copyright (C) 2017 SiFive */ +#include <linux/of.h> #include <asm/cacheflush.h> #ifdef CONFIG_SMP @@ -86,3 +87,40 @@ void flush_icache_pte(pte_t pte) flush_icache_all(); } #endif /* CONFIG_MMU */ + +unsigned int riscv_cbom_block_size; +EXPORT_SYMBOL(riscv_cbom_block_size); + +void riscv_init_cbom_blocksize(void) +{ + struct device_node *node; + unsigned long cbom_hartid; + u32 val, probed_block_size; + int ret; + + probed_block_size = 0; + for_each_of_cpu_node(node) { + unsigned long hartid; + + ret = riscv_of_processor_hartid(node, &hartid); + if (ret) + continue; + + /* set block-size for cbom extension if available */ + ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); + if (ret) + continue; + + if (!probed_block_size) { + probed_block_size = val; + cbom_hartid = hartid; + } else { + 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; +} diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c index b0add983530a..d919efab6eba 100644 --- a/arch/riscv/mm/dma-noncoherent.c +++ b/arch/riscv/mm/dma-noncoherent.c @@ -8,13 +8,8 @@ #include <linux/dma-direct.h> #include <linux/dma-map-ops.h> #include <linux/mm.h> -#include <linux/of.h> -#include <linux/of_device.h> #include <asm/cacheflush.h> -unsigned int riscv_cbom_block_size; -EXPORT_SYMBOL_GPL(riscv_cbom_block_size); - static bool noncoherent_supported; void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, @@ -77,42 +72,6 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, dev->dma_coherent = coherent; } -#ifdef CONFIG_RISCV_ISA_ZICBOM -void riscv_init_cbom_blocksize(void) -{ - struct device_node *node; - unsigned long cbom_hartid; - u32 val, probed_block_size; - int ret; - - probed_block_size = 0; - for_each_of_cpu_node(node) { - unsigned long hartid; - - ret = riscv_of_processor_hartid(node, &hartid); - if (ret) - continue; - - /* set block-size for cbom extension if available */ - ret = of_property_read_u32(node, "riscv,cbom-block-size", &val); - if (ret) - continue; - - if (!probed_block_size) { - probed_block_size = val; - cbom_hartid = hartid; - } else { - 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,
riscv_cbom_block_size and riscv_init_cbom_blocksize() should always be available and riscv_init_cbom_blocksize() should always be invoked, even when compiling without RISCV_ISA_ZICBOM enabled. This is because disabling RISCV_ISA_ZICBOM means "don't use zicbom instructions in the kernel" not "pretend there isn't zicbom, even when there is". When zicbom is available, whether the kernel enables its use with RISCV_ISA_ZICBOM or not, KVM will offer it to guests. Ensure we can build KVM and that the block size is initialized even when compiling without RISCV_ISA_ZICBOM. Fixes: 8f7e001e0325 ("RISC-V: Clean up the Zicbom block size probing") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Andrew Jones <ajones@ventanamicro.com> --- arch/riscv/include/asm/cacheflush.h | 8 ------ arch/riscv/mm/cacheflush.c | 38 ++++++++++++++++++++++++++ arch/riscv/mm/dma-noncoherent.c | 41 ----------------------------- 3 files changed, 38 insertions(+), 49 deletions(-)