| Message ID | 1405326487-15346-5-git-send-email-m.szyprowski@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 14 Jul 2014 10:28:07 +0200, Marek Szyprowski <m.szyprowski@samsung.com> wrote: > Add a function to create CMA region from previously reserved memory > and add support for handling 'shared-dma-pool' reserved-memory device > tree nodes. > > Based on previous code provided by Josh Cartwright <joshc@codeaurora.org> I think this is okay too. Same questions apply as I sent on patch 3. g. > > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> > --- > drivers/base/dma-contiguous.c | 67 +++++++++++++++++++++++++++++++++++++++++++ > include/linux/cma.h | 3 ++ > mm/cma.c | 62 ++++++++++++++++++++++++++++++++------- > 3 files changed, 121 insertions(+), 11 deletions(-) > > diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c > index 6606abdf880c..b77ea8bac176 100644 > --- a/drivers/base/dma-contiguous.c > +++ b/drivers/base/dma-contiguous.c > @@ -211,3 +211,70 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages, > { > return cma_release(dev_get_cma_area(dev), pages, count); > } > + > +/* > + * Support for reserved memory regions defined in device tree > + */ > +#ifdef CONFIG_OF_RESERVED_MEM > +#include <linux/of.h> > +#include <linux/of_fdt.h> > +#include <linux/of_reserved_mem.h> > + > +#undef pr_fmt > +#define pr_fmt(fmt) fmt > + > +static void rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev) > +{ > + struct cma *cma = rmem->priv; > + dev_set_cma_area(dev, cma); > +} > + > +static void rmem_cma_device_release(struct reserved_mem *rmem, > + struct device *dev) > +{ > + dev_set_cma_area(dev, NULL); > +} > + > +static const struct reserved_mem_ops rmem_cma_ops = { > + .device_init = rmem_cma_device_init, > + .device_release = rmem_cma_device_release, > +}; > + > +static int __init rmem_cma_setup(struct reserved_mem *rmem) > +{ > + phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order); > + phys_addr_t mask = align - 1; > + unsigned long node = rmem->fdt_node; > + struct cma *cma; > + int err; > + > + if (!of_get_flat_dt_prop(node, "reusable", NULL) || > + of_get_flat_dt_prop(node, "no-map", NULL)) > + return -EINVAL; > + > + if ((rmem->base & mask) || (rmem->size & mask)) { > + pr_err("Reserved memory: incorrect alignment of CMA region\n"); > + return -EINVAL; > + } > + > + err = cma_init_reserved_mem(rmem->base, rmem->size, 0, &cma); > + if (err) { > + pr_err("Reserved memory: unable to setup CMA region\n"); > + return err; > + } > + /* Architecture specific contiguous memory fixup. */ > + dma_contiguous_early_fixup(rmem->base, rmem->size); > + > + if (of_get_flat_dt_prop(node, "linux,cma-default", NULL)) > + dma_contiguous_set_default(cma); > + > + rmem->ops = &rmem_cma_ops; > + rmem->priv = cma; > + > + pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n", > + &rmem->base, (unsigned long)rmem->size / SZ_1M); > + > + return 0; > +} > +RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup); > +#endif > diff --git a/include/linux/cma.h b/include/linux/cma.h > index 32cab7a425f9..9a18a2b1934c 100644 > --- a/include/linux/cma.h > +++ b/include/linux/cma.h > @@ -16,6 +16,9 @@ extern int __init cma_declare_contiguous(phys_addr_t size, > phys_addr_t base, phys_addr_t limit, > phys_addr_t alignment, unsigned int order_per_bit, > bool fixed, struct cma **res_cma); > +extern int cma_init_reserved_mem(phys_addr_t size, > + phys_addr_t base, int order_per_bit, > + struct cma **res_cma); > extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align); > extern bool cma_release(struct cma *cma, struct page *pages, int count); > #endif > diff --git a/mm/cma.c b/mm/cma.c > index 4b251b037e1b..b3d8b925ad34 100644 > --- a/mm/cma.c > +++ b/mm/cma.c > @@ -140,6 +140,54 @@ static int __init cma_init_reserved_areas(void) > core_initcall(cma_init_reserved_areas); > > /** > + * cma_init_reserved_mem() - create custom contiguous area from reserved memory > + * @base: Base address of the reserved area > + * @size: Size of the reserved area (in bytes), > + * @order_per_bit: Order of pages represented by one bit on bitmap. > + * @res_cma: Pointer to store the created cma region. > + * > + * This function creates custom contiguous area from already reserved memory. > + */ > +int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, > + int order_per_bit, struct cma **res_cma) > +{ > + struct cma *cma; > + phys_addr_t alignment; > + > + /* Sanity checks */ > + if (cma_area_count == ARRAY_SIZE(cma_areas)) { > + pr_err("Not enough slots for CMA reserved regions!\n"); > + return -ENOSPC; > + } > + > + if (!size || !memblock_is_region_reserved(base, size)) > + return -EINVAL; > + > + /* ensure minimal alignment requied by mm core */ > + alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order); > + > + /* alignment should be aligned with order_per_bit */ > + if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit)) > + return -EINVAL; > + > + if (ALIGN(base, alignment) != base || ALIGN(size, alignment) != size) > + return -EINVAL; > + > + /* > + * Each reserved area must be initialised later, when more kernel > + * subsystems (like slab allocator) are available. > + */ > + cma = &cma_areas[cma_area_count]; > + cma->base_pfn = PFN_DOWN(base); > + cma->count = size >> PAGE_SHIFT; > + cma->order_per_bit = order_per_bit; > + *res_cma = cma; > + cma_area_count++; > + > + return 0; > +} > + > +/** > * cma_declare_contiguous() - reserve custom contiguous area > * @base: Base address of the reserved area optional, use 0 for any > * @size: Size of the reserved area (in bytes), > @@ -162,7 +210,6 @@ int __init cma_declare_contiguous(phys_addr_t base, > phys_addr_t alignment, unsigned int order_per_bit, > bool fixed, struct cma **res_cma) > { > - struct cma *cma; > int ret = 0; > > pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n", > @@ -214,16 +261,9 @@ int __init cma_declare_contiguous(phys_addr_t base, > } > } > > - /* > - * Each reserved area must be initialised later, when more kernel > - * subsystems (like slab allocator) are available. > - */ > - cma = &cma_areas[cma_area_count]; > - cma->base_pfn = PFN_DOWN(base); > - cma->count = size >> PAGE_SHIFT; > - cma->order_per_bit = order_per_bit; > - *res_cma = cma; > - cma_area_count++; > + ret = cma_init_reserved_mem(base, size, order_per_bit, res_cma); > + if (ret) > + goto err; > > pr_info("Reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M, > (unsigned long)base); > -- > 1.9.2 >
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index 6606abdf880c..b77ea8bac176 100644 --- a/drivers/base/dma-contiguous.c +++ b/drivers/base/dma-contiguous.c @@ -211,3 +211,70 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages, { return cma_release(dev_get_cma_area(dev), pages, count); } + +/* + * Support for reserved memory regions defined in device tree + */ +#ifdef CONFIG_OF_RESERVED_MEM +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/of_reserved_mem.h> + +#undef pr_fmt +#define pr_fmt(fmt) fmt + +static void rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev) +{ + struct cma *cma = rmem->priv; + dev_set_cma_area(dev, cma); +} + +static void rmem_cma_device_release(struct reserved_mem *rmem, + struct device *dev) +{ + dev_set_cma_area(dev, NULL); +} + +static const struct reserved_mem_ops rmem_cma_ops = { + .device_init = rmem_cma_device_init, + .device_release = rmem_cma_device_release, +}; + +static int __init rmem_cma_setup(struct reserved_mem *rmem) +{ + phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order); + phys_addr_t mask = align - 1; + unsigned long node = rmem->fdt_node; + struct cma *cma; + int err; + + if (!of_get_flat_dt_prop(node, "reusable", NULL) || + of_get_flat_dt_prop(node, "no-map", NULL)) + return -EINVAL; + + if ((rmem->base & mask) || (rmem->size & mask)) { + pr_err("Reserved memory: incorrect alignment of CMA region\n"); + return -EINVAL; + } + + err = cma_init_reserved_mem(rmem->base, rmem->size, 0, &cma); + if (err) { + pr_err("Reserved memory: unable to setup CMA region\n"); + return err; + } + /* Architecture specific contiguous memory fixup. */ + dma_contiguous_early_fixup(rmem->base, rmem->size); + + if (of_get_flat_dt_prop(node, "linux,cma-default", NULL)) + dma_contiguous_set_default(cma); + + rmem->ops = &rmem_cma_ops; + rmem->priv = cma; + + pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n", + &rmem->base, (unsigned long)rmem->size / SZ_1M); + + return 0; +} +RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup); +#endif diff --git a/include/linux/cma.h b/include/linux/cma.h index 32cab7a425f9..9a18a2b1934c 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -16,6 +16,9 @@ extern int __init cma_declare_contiguous(phys_addr_t size, phys_addr_t base, phys_addr_t limit, phys_addr_t alignment, unsigned int order_per_bit, bool fixed, struct cma **res_cma); +extern int cma_init_reserved_mem(phys_addr_t size, + phys_addr_t base, int order_per_bit, + struct cma **res_cma); extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align); extern bool cma_release(struct cma *cma, struct page *pages, int count); #endif diff --git a/mm/cma.c b/mm/cma.c index 4b251b037e1b..b3d8b925ad34 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -140,6 +140,54 @@ static int __init cma_init_reserved_areas(void) core_initcall(cma_init_reserved_areas); /** + * cma_init_reserved_mem() - create custom contiguous area from reserved memory + * @base: Base address of the reserved area + * @size: Size of the reserved area (in bytes), + * @order_per_bit: Order of pages represented by one bit on bitmap. + * @res_cma: Pointer to store the created cma region. + * + * This function creates custom contiguous area from already reserved memory. + */ +int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, + int order_per_bit, struct cma **res_cma) +{ + struct cma *cma; + phys_addr_t alignment; + + /* Sanity checks */ + if (cma_area_count == ARRAY_SIZE(cma_areas)) { + pr_err("Not enough slots for CMA reserved regions!\n"); + return -ENOSPC; + } + + if (!size || !memblock_is_region_reserved(base, size)) + return -EINVAL; + + /* ensure minimal alignment requied by mm core */ + alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order); + + /* alignment should be aligned with order_per_bit */ + if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit)) + return -EINVAL; + + if (ALIGN(base, alignment) != base || ALIGN(size, alignment) != size) + return -EINVAL; + + /* + * Each reserved area must be initialised later, when more kernel + * subsystems (like slab allocator) are available. + */ + cma = &cma_areas[cma_area_count]; + cma->base_pfn = PFN_DOWN(base); + cma->count = size >> PAGE_SHIFT; + cma->order_per_bit = order_per_bit; + *res_cma = cma; + cma_area_count++; + + return 0; +} + +/** * cma_declare_contiguous() - reserve custom contiguous area * @base: Base address of the reserved area optional, use 0 for any * @size: Size of the reserved area (in bytes), @@ -162,7 +210,6 @@ int __init cma_declare_contiguous(phys_addr_t base, phys_addr_t alignment, unsigned int order_per_bit, bool fixed, struct cma **res_cma) { - struct cma *cma; int ret = 0; pr_debug("%s(size %lx, base %08lx, limit %08lx alignment %08lx)\n", @@ -214,16 +261,9 @@ int __init cma_declare_contiguous(phys_addr_t base, } } - /* - * Each reserved area must be initialised later, when more kernel - * subsystems (like slab allocator) are available. - */ - cma = &cma_areas[cma_area_count]; - cma->base_pfn = PFN_DOWN(base); - cma->count = size >> PAGE_SHIFT; - cma->order_per_bit = order_per_bit; - *res_cma = cma; - cma_area_count++; + ret = cma_init_reserved_mem(base, size, order_per_bit, res_cma); + if (ret) + goto err; pr_info("Reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M, (unsigned long)base);
Add a function to create CMA region from previously reserved memory and add support for handling 'shared-dma-pool' reserved-memory device tree nodes. Based on previous code provided by Josh Cartwright <joshc@codeaurora.org> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- drivers/base/dma-contiguous.c | 67 +++++++++++++++++++++++++++++++++++++++++++ include/linux/cma.h | 3 ++ mm/cma.c | 62 ++++++++++++++++++++++++++++++++------- 3 files changed, 121 insertions(+), 11 deletions(-)