diff mbox series

[v12,3/6] riscv: mm: dma-noncoherent: nonstandard cache operations support

Message ID 20230818135723.80612-4-prabhakar.mahadev-lad.rj@bp.renesas.com (mailing list archive)
State Accepted
Commit 30bc090f40f850da09cad778e594462ae36991d4
Headers show
Series Add non-coherent DMA support for AX45MP | expand

Checks

Context Check Description
conchuod/tree_selection fail Failed to apply to next/pending-fixes, riscv/for-next or riscv/master

Commit Message

Lad, Prabhakar Aug. 18, 2023, 1:57 p.m. UTC 
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Introduce support for nonstandard noncoherent systems in the RISC-V
architecture. It enables function pointer support to handle cache
management in such systems.

This patch adds a new configuration option called
"RISCV_NONSTANDARD_CACHE_OPS." This option is a boolean flag that
depends on "RISCV_DMA_NONCOHERENT" and enables the function pointer
support for cache management in nonstandard noncoherent systems.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com> # tyre-kicking on a d1
---
v11 -> v12
* Renamed struct riscv_cache_ops -> struct riscv_nonstd_cache_ops

v10 -> v11
* Changed data type of size from unsigned long to size_t
* Reworded doc for struct riscv_cache_ops

v9 -> v10
* Added __ro_after_init compiler attribute for noncoherent_cache_ops
* Renamed clean -> wback
* Renamed inval -> inv
* Renamed flush -> wback_inv

v8 -> v9
* New patch
---
 arch/riscv/Kconfig                       |  7 ++++
 arch/riscv/include/asm/dma-noncoherent.h | 28 +++++++++++++++
 arch/riscv/mm/dma-noncoherent.c          | 43 ++++++++++++++++++++++++
 arch/riscv/mm/pmem.c                     | 13 +++++++
 4 files changed, 91 insertions(+)
 create mode 100644 arch/riscv/include/asm/dma-noncoherent.h

Comments

Emil Renner Berthing Aug. 24, 2023, 12:36 p.m. UTC | #1 
On Fri, 18 Aug 2023 at 15:57, Prabhakar <prabhakar.csengg@gmail.com> wrote:
>
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Introduce support for nonstandard noncoherent systems in the RISC-V
> architecture. It enables function pointer support to handle cache
> management in such systems.
>
> This patch adds a new configuration option called
> "RISCV_NONSTANDARD_CACHE_OPS." This option is a boolean flag that
> depends on "RISCV_DMA_NONCOHERENT" and enables the function pointer
> support for cache management in nonstandard noncoherent systems.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> Tested-by: Conor Dooley <conor.dooley@microchip.com> # tyre-kicking on a d1

Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Tested-by: Emil Renner Berthing <emil.renner.berthing@canonical.com> #
on the StarFive JH7100

> ---
> v11 -> v12
> * Renamed struct riscv_cache_ops -> struct riscv_nonstd_cache_ops
>
> v10 -> v11
> * Changed data type of size from unsigned long to size_t
> * Reworded doc for struct riscv_cache_ops
>
> v9 -> v10
> * Added __ro_after_init compiler attribute for noncoherent_cache_ops
> * Renamed clean -> wback
> * Renamed inval -> inv
> * Renamed flush -> wback_inv
>
> v8 -> v9
> * New patch
> ---
>  arch/riscv/Kconfig                       |  7 ++++
>  arch/riscv/include/asm/dma-noncoherent.h | 28 +++++++++++++++
>  arch/riscv/mm/dma-noncoherent.c          | 43 ++++++++++++++++++++++++
>  arch/riscv/mm/pmem.c                     | 13 +++++++
>  4 files changed, 91 insertions(+)
>  create mode 100644 arch/riscv/include/asm/dma-noncoherent.h
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index f52dd125ac5e..a629d383affb 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -269,6 +269,13 @@ config RISCV_DMA_NONCOHERENT
>         select ARCH_HAS_SYNC_DMA_FOR_DEVICE
>         select DMA_DIRECT_REMAP
>
> +config RISCV_NONSTANDARD_CACHE_OPS
> +       bool
> +       depends on RISCV_DMA_NONCOHERENT
> +       help
> +         This enables function pointer support for non-standard noncoherent
> +         systems to handle cache management.
> +
>  config AS_HAS_INSN
>         def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
>
> diff --git a/arch/riscv/include/asm/dma-noncoherent.h b/arch/riscv/include/asm/dma-noncoherent.h
> new file mode 100644
> index 000000000000..312cfa0858fb
> --- /dev/null
> +++ b/arch/riscv/include/asm/dma-noncoherent.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2023 Renesas Electronics Corp.
> + */
> +
> +#ifndef __ASM_DMA_NONCOHERENT_H
> +#define __ASM_DMA_NONCOHERENT_H
> +
> +#include <linux/dma-direct.h>
> +
> +/*
> + * struct riscv_nonstd_cache_ops - Structure for non-standard CMO function pointers
> + *
> + * @wback: Function pointer for cache writeback
> + * @inv: Function pointer for invalidating cache
> + * @wback_inv: Function pointer for flushing the cache (writeback + invalidating)
> + */
> +struct riscv_nonstd_cache_ops {
> +       void (*wback)(phys_addr_t paddr, size_t size);
> +       void (*inv)(phys_addr_t paddr, size_t size);
> +       void (*wback_inv)(phys_addr_t paddr, size_t size);
> +};
> +
> +extern struct riscv_nonstd_cache_ops noncoherent_cache_ops;
> +
> +void riscv_noncoherent_register_cache_ops(const struct riscv_nonstd_cache_ops *ops);
> +
> +#endif /* __ASM_DMA_NONCOHERENT_H */
> diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
> index 06b8fea58e20..a4f3f37859ae 100644
> --- a/arch/riscv/mm/dma-noncoherent.c
> +++ b/arch/riscv/mm/dma-noncoherent.c
> @@ -9,13 +9,26 @@
>  #include <linux/dma-map-ops.h>
>  #include <linux/mm.h>
>  #include <asm/cacheflush.h>
> +#include <asm/dma-noncoherent.h>
>
>  static bool noncoherent_supported __ro_after_init;
>
> +struct riscv_nonstd_cache_ops noncoherent_cache_ops __ro_after_init = {
> +       .wback = NULL,
> +       .inv = NULL,
> +       .wback_inv = NULL,
> +};
> +
>  static inline void arch_dma_cache_wback(phys_addr_t paddr, size_t size)
>  {
>         void *vaddr = phys_to_virt(paddr);
>
> +#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
> +       if (unlikely(noncoherent_cache_ops.wback)) {
> +               noncoherent_cache_ops.wback(paddr, size);
> +               return;
> +       }
> +#endif
>         ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
>  }
>
> @@ -23,6 +36,13 @@ static inline void arch_dma_cache_inv(phys_addr_t paddr, size_t size)
>  {
>         void *vaddr = phys_to_virt(paddr);
>
> +#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
> +       if (unlikely(noncoherent_cache_ops.inv)) {
> +               noncoherent_cache_ops.inv(paddr, size);
> +               return;
> +       }
> +#endif
> +
>         ALT_CMO_OP(inval, vaddr, size, riscv_cbom_block_size);
>  }
>
> @@ -30,6 +50,13 @@ static inline void arch_dma_cache_wback_inv(phys_addr_t paddr, size_t size)
>  {
>         void *vaddr = phys_to_virt(paddr);
>
> +#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
> +       if (unlikely(noncoherent_cache_ops.wback_inv)) {
> +               noncoherent_cache_ops.wback_inv(paddr, size);
> +               return;
> +       }
> +#endif
> +
>         ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
>  }
>
> @@ -95,6 +122,13 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
>  {
>         void *flush_addr = page_address(page);
>
> +#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
> +       if (unlikely(noncoherent_cache_ops.wback_inv)) {
> +               noncoherent_cache_ops.wback_inv(page_to_phys(page), size);
> +               return;
> +       }
> +#endif
> +
>         ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size);
>  }
>
> @@ -120,3 +154,12 @@ void riscv_noncoherent_supported(void)
>              "Non-coherent DMA support enabled without a block size\n");
>         noncoherent_supported = true;
>  }
> +
> +void riscv_noncoherent_register_cache_ops(const struct riscv_nonstd_cache_ops *ops)
> +{
> +       if (!ops)
> +               return;
> +
> +       noncoherent_cache_ops = *ops;
> +}
> +EXPORT_SYMBOL_GPL(riscv_noncoherent_register_cache_ops);
> diff --git a/arch/riscv/mm/pmem.c b/arch/riscv/mm/pmem.c
> index 089df92ae876..c5fc5ec96f6d 100644
> --- a/arch/riscv/mm/pmem.c
> +++ b/arch/riscv/mm/pmem.c
> @@ -7,15 +7,28 @@
>  #include <linux/libnvdimm.h>
>
>  #include <asm/cacheflush.h>
> +#include <asm/dma-noncoherent.h>
>
>  void arch_wb_cache_pmem(void *addr, size_t size)
>  {
> +#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
> +       if (unlikely(noncoherent_cache_ops.wback)) {
> +               noncoherent_cache_ops.wback(virt_to_phys(addr), size);
> +               return;
> +       }
> +#endif
>         ALT_CMO_OP(clean, addr, size, riscv_cbom_block_size);
>  }
>  EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
>
>  void arch_invalidate_pmem(void *addr, size_t size)
>  {
> +#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
> +       if (unlikely(noncoherent_cache_ops.inv)) {
> +               noncoherent_cache_ops.inv(virt_to_phys(addr), size);
> +               return;
> +       }
> +#endif
>         ALT_CMO_OP(inval, addr, size, riscv_cbom_block_size);
>  }
>  EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
> --
> 2.34.1
>
diff mbox series

Patch

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index f52dd125ac5e..a629d383affb 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -269,6 +269,13 @@  config RISCV_DMA_NONCOHERENT
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select DMA_DIRECT_REMAP
 
+config RISCV_NONSTANDARD_CACHE_OPS
+	bool
+	depends on RISCV_DMA_NONCOHERENT
+	help
+	  This enables function pointer support for non-standard noncoherent
+	  systems to handle cache management.
+
 config AS_HAS_INSN
 	def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero)
 
diff --git a/arch/riscv/include/asm/dma-noncoherent.h b/arch/riscv/include/asm/dma-noncoherent.h
new file mode 100644
index 000000000000..312cfa0858fb
--- /dev/null
+++ b/arch/riscv/include/asm/dma-noncoherent.h
@@ -0,0 +1,28 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2023 Renesas Electronics Corp.
+ */
+
+#ifndef __ASM_DMA_NONCOHERENT_H
+#define __ASM_DMA_NONCOHERENT_H
+
+#include <linux/dma-direct.h>
+
+/*
+ * struct riscv_nonstd_cache_ops - Structure for non-standard CMO function pointers
+ *
+ * @wback: Function pointer for cache writeback
+ * @inv: Function pointer for invalidating cache
+ * @wback_inv: Function pointer for flushing the cache (writeback + invalidating)
+ */
+struct riscv_nonstd_cache_ops {
+	void (*wback)(phys_addr_t paddr, size_t size);
+	void (*inv)(phys_addr_t paddr, size_t size);
+	void (*wback_inv)(phys_addr_t paddr, size_t size);
+};
+
+extern struct riscv_nonstd_cache_ops noncoherent_cache_ops;
+
+void riscv_noncoherent_register_cache_ops(const struct riscv_nonstd_cache_ops *ops);
+
+#endif	/* __ASM_DMA_NONCOHERENT_H */
diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
index 06b8fea58e20..a4f3f37859ae 100644
--- a/arch/riscv/mm/dma-noncoherent.c
+++ b/arch/riscv/mm/dma-noncoherent.c
@@ -9,13 +9,26 @@ 
 #include <linux/dma-map-ops.h>
 #include <linux/mm.h>
 #include <asm/cacheflush.h>
+#include <asm/dma-noncoherent.h>
 
 static bool noncoherent_supported __ro_after_init;
 
+struct riscv_nonstd_cache_ops noncoherent_cache_ops __ro_after_init = {
+	.wback = NULL,
+	.inv = NULL,
+	.wback_inv = NULL,
+};
+
 static inline void arch_dma_cache_wback(phys_addr_t paddr, size_t size)
 {
 	void *vaddr = phys_to_virt(paddr);
 
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (unlikely(noncoherent_cache_ops.wback)) {
+		noncoherent_cache_ops.wback(paddr, size);
+		return;
+	}
+#endif
 	ALT_CMO_OP(clean, vaddr, size, riscv_cbom_block_size);
 }
 
@@ -23,6 +36,13 @@  static inline void arch_dma_cache_inv(phys_addr_t paddr, size_t size)
 {
 	void *vaddr = phys_to_virt(paddr);
 
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (unlikely(noncoherent_cache_ops.inv)) {
+		noncoherent_cache_ops.inv(paddr, size);
+		return;
+	}
+#endif
+
 	ALT_CMO_OP(inval, vaddr, size, riscv_cbom_block_size);
 }
 
@@ -30,6 +50,13 @@  static inline void arch_dma_cache_wback_inv(phys_addr_t paddr, size_t size)
 {
 	void *vaddr = phys_to_virt(paddr);
 
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (unlikely(noncoherent_cache_ops.wback_inv)) {
+		noncoherent_cache_ops.wback_inv(paddr, size);
+		return;
+	}
+#endif
+
 	ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
 }
 
@@ -95,6 +122,13 @@  void arch_dma_prep_coherent(struct page *page, size_t size)
 {
 	void *flush_addr = page_address(page);
 
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (unlikely(noncoherent_cache_ops.wback_inv)) {
+		noncoherent_cache_ops.wback_inv(page_to_phys(page), size);
+		return;
+	}
+#endif
+
 	ALT_CMO_OP(flush, flush_addr, size, riscv_cbom_block_size);
 }
 
@@ -120,3 +154,12 @@  void riscv_noncoherent_supported(void)
 	     "Non-coherent DMA support enabled without a block size\n");
 	noncoherent_supported = true;
 }
+
+void riscv_noncoherent_register_cache_ops(const struct riscv_nonstd_cache_ops *ops)
+{
+	if (!ops)
+		return;
+
+	noncoherent_cache_ops = *ops;
+}
+EXPORT_SYMBOL_GPL(riscv_noncoherent_register_cache_ops);
diff --git a/arch/riscv/mm/pmem.c b/arch/riscv/mm/pmem.c
index 089df92ae876..c5fc5ec96f6d 100644
--- a/arch/riscv/mm/pmem.c
+++ b/arch/riscv/mm/pmem.c
@@ -7,15 +7,28 @@ 
 #include <linux/libnvdimm.h>
 
 #include <asm/cacheflush.h>
+#include <asm/dma-noncoherent.h>
 
 void arch_wb_cache_pmem(void *addr, size_t size)
 {
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (unlikely(noncoherent_cache_ops.wback)) {
+		noncoherent_cache_ops.wback(virt_to_phys(addr), size);
+		return;
+	}
+#endif
 	ALT_CMO_OP(clean, addr, size, riscv_cbom_block_size);
 }
 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
 
 void arch_invalidate_pmem(void *addr, size_t size)
 {
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (unlikely(noncoherent_cache_ops.inv)) {
+		noncoherent_cache_ops.inv(virt_to_phys(addr), size);
+		return;
+	}
+#endif
 	ALT_CMO_OP(inval, addr, size, riscv_cbom_block_size);
 }
 EXPORT_SYMBOL_GPL(arch_invalidate_pmem);