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Date: Tue, 6 Nov 2018 15:01:41 +0800
From: Guo Ren <ren_guo@...ky.com>
To: Christoph Hellwig <hch@....de>
Cc: iommu@...ts.linux-foundation.org,
Robin Murphy <robin.murphy@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Laura Abbott <labbott@...hat.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] csky: use the generic remapping dma alloc
implementation
On Mon, Nov 05, 2018 at 01:19:31PM +0100, Christoph Hellwig wrote:
> The csky code was largely copied from arm/arm64, so switch to the
> generic arm64-based implementation instead.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> arch/csky/Kconfig | 2 +-
> arch/csky/mm/dma-mapping.c | 142 +------------------------------------
> 2 files changed, 3 insertions(+), 141 deletions(-)
>
> diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
> index c0cf8e948821..ea74f3a9eeaf 100644
> --- a/arch/csky/Kconfig
> +++ b/arch/csky/Kconfig
> @@ -8,7 +8,7 @@ config CSKY
> select CLKSRC_MMIO
> select CLKSRC_OF
> select DMA_DIRECT_OPS
> - select DMA_REMAP
> + select DMA_DIRECT_REMAP
> select IRQ_DOMAIN
> select HANDLE_DOMAIN_IRQ
> select DW_APB_TIMER_OF
> diff --git a/arch/csky/mm/dma-mapping.c b/arch/csky/mm/dma-mapping.c
> index ad4046939713..80783bb71c5c 100644
> --- a/arch/csky/mm/dma-mapping.c
> +++ b/arch/csky/mm/dma-mapping.c
> @@ -14,73 +14,13 @@
> #include <linux/version.h>
> #include <asm/cache.h>
>
> -static struct gen_pool *atomic_pool;
> -static size_t atomic_pool_size __initdata = SZ_256K;
> -
> -static int __init early_coherent_pool(char *p)
> -{
> - atomic_pool_size = memparse(p, &p);
> - return 0;
> -}
> -early_param("coherent_pool", early_coherent_pool);
> -
> static int __init atomic_pool_init(void)
> {
> - struct page *page;
> - size_t size = atomic_pool_size;
> - void *ptr;
> - int ret;
> -
> - atomic_pool = gen_pool_create(PAGE_SHIFT, -1);
> - if (!atomic_pool)
> - BUG();
> -
> - page = alloc_pages(GFP_KERNEL, get_order(size));
> - if (!page)
> - BUG();
> -
> - ptr = dma_common_contiguous_remap(page, size, VM_ALLOC,
> - pgprot_noncached(PAGE_KERNEL),
> - __builtin_return_address(0));
> - if (!ptr)
> - BUG();
> -
> - ret = gen_pool_add_virt(atomic_pool, (unsigned long)ptr,
> - page_to_phys(page), atomic_pool_size, -1);
> - if (ret)
> - BUG();
> -
> - gen_pool_set_algo(atomic_pool, gen_pool_first_fit_order_align, NULL);
> -
> - pr_info("DMA: preallocated %zu KiB pool for atomic coherent pool\n",
> - atomic_pool_size / 1024);
> -
> - pr_info("DMA: vaddr: 0x%x phy: 0x%lx,\n", (unsigned int)ptr,
> - page_to_phys(page));
> -
> - return 0;
> + return dma_atomic_pool_init(GFP_KERNEL, pgprot_noncached(PAGE_KERNEL));
> }
> postcore_initcall(atomic_pool_init);
Seems also could remove atomic_pool_init from csky, why not put them in
common?
>
> -static void *csky_dma_alloc_atomic(struct device *dev, size_t size,
> - dma_addr_t *dma_handle)
> -{
> - unsigned long addr;
> -
> - addr = gen_pool_alloc(atomic_pool, size);
> - if (addr)
> - *dma_handle = gen_pool_virt_to_phys(atomic_pool, addr);
> -
> - return (void *)addr;
> -}
> -
> -static void csky_dma_free_atomic(struct device *dev, size_t size, void *vaddr,
> - dma_addr_t dma_handle, unsigned long attrs)
> -{
> - gen_pool_free(atomic_pool, (unsigned long)vaddr, size);
> -}
> -
> -static void __dma_clear_buffer(struct page *page, size_t size)
> +void arch_dma_prep_coherent(struct page *page, size_t size)
> {
> if (PageHighMem(page)) {
> unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
> @@ -107,84 +47,6 @@ static void __dma_clear_buffer(struct page *page, size_t size)
> }
> }
>
> -static void *csky_dma_alloc_nonatomic(struct device *dev, size_t size,
> - dma_addr_t *dma_handle, gfp_t gfp,
> - unsigned long attrs)
> -{
> - void *vaddr;
> - struct page *page;
> - unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
> -
> - if (DMA_ATTR_NON_CONSISTENT & attrs) {
> - pr_err("csky %s can't support DMA_ATTR_NON_CONSISTENT.\n", __func__);
> - return NULL;
> - }
> -
> - if (IS_ENABLED(CONFIG_DMA_CMA))
> - page = dma_alloc_from_contiguous(dev, count, get_order(size),
> - gfp);
> - else
> - page = alloc_pages(gfp, get_order(size));
> -
> - if (!page) {
> - pr_err("csky %s no more free pages.\n", __func__);
> - return NULL;
> - }
> -
> - *dma_handle = page_to_phys(page);
> -
> - __dma_clear_buffer(page, size);
> -
> - if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
> - return page;
> -
> - vaddr = dma_common_contiguous_remap(page, PAGE_ALIGN(size), VM_USERMAP,
> - pgprot_noncached(PAGE_KERNEL), __builtin_return_address(0));
> - if (!vaddr)
> - BUG();
> -
> - return vaddr;
> -}
> -
> -static void csky_dma_free_nonatomic(
> - struct device *dev,
> - size_t size,
> - void *vaddr,
> - dma_addr_t dma_handle,
> - unsigned long attrs
> - )
> -{
> - struct page *page = phys_to_page(dma_handle);
> - unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
> -
> - if ((unsigned int)vaddr >= VMALLOC_START)
> - dma_common_free_remap(vaddr, size, VM_USERMAP);
> -
> - if (IS_ENABLED(CONFIG_DMA_CMA))
> - dma_release_from_contiguous(dev, page, count);
> - else
> - __free_pages(page, get_order(size));
> -}
> -
> -void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
> - gfp_t gfp, unsigned long attrs)
> -{
> - if (gfpflags_allow_blocking(gfp))
> - return csky_dma_alloc_nonatomic(dev, size, dma_handle, gfp,
> - attrs);
> - else
> - return csky_dma_alloc_atomic(dev, size, dma_handle);
> -}
> -
> -void arch_dma_free(struct device *dev, size_t size, void *vaddr,
> - dma_addr_t dma_handle, unsigned long attrs)
> -{
> - if (!addr_in_gen_pool(atomic_pool, (unsigned int) vaddr, size))
> - csky_dma_free_nonatomic(dev, size, vaddr, dma_handle, attrs);
> - else
> - csky_dma_free_atomic(dev, size, vaddr, dma_handle, attrs);
> -}
> -
> static inline void cache_op(phys_addr_t paddr, size_t size,
> void (*fn)(unsigned long start, unsigned long end))
> {
> --
> 2.19.1
Reviewed-by: Guo Ren <ren_guo@...ky.com>
Compile is OK, qemu boot OK. Functions are the same and just move to common.
Looks good for me.
Guo Ren
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