On Tue, 04 Feb 2014 13:09:31 +0100, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: > From: Josh Cartwright <joshc@xxxxxxxxxxxxxx> > > Add support for handling 'shared-dma-pool' reserved-memory nodes using > Contiguous Memory Allocator driver. > > Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> > Cc: Laura Abbott <lauraa@xxxxxxxxxxxxxx> > Signed-off-by: Josh Cartwright <joshc@xxxxxxxxxxxxxx> > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > --- > drivers/of/Kconfig | 7 ++++ > drivers/of/Makefile | 1 + > drivers/of/of_reserved_mem_cma.c | 75 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 83 insertions(+) > create mode 100644 drivers/of/of_reserved_mem_cma.c > > diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig > index 7ac330473ec9..5dd3a80910d2 100644 > --- a/drivers/of/Kconfig > +++ b/drivers/of/Kconfig > @@ -81,6 +81,13 @@ config OF_RESERVED_MEM > help > Helpers to allow for reservation of memory regions > > +config OF_RESERVED_MEM_CMA > + depends on OF_RESERVED_MEM > + depends on DMA_CMA > + def_bool y > + help > + Helpers for reserving memory regions for DMA use > + > config OF_RESERVED_MEM_DMA > depends on OF_RESERVED_MEM > depends on HAVE_GENERIC_DMA_COHERENT > diff --git a/drivers/of/Makefile b/drivers/of/Makefile > index 6142227ca854..49b9078637b8 100644 > --- a/drivers/of/Makefile > +++ b/drivers/of/Makefile > @@ -10,4 +10,5 @@ obj-$(CONFIG_OF_PCI) += of_pci.o > obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o > obj-$(CONFIG_OF_MTD) += of_mtd.o > obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o > +obj-$(CONFIG_OF_RESERVED_MEM_CMA) += of_reserved_mem_cma.o > obj-$(CONFIG_OF_RESERVED_MEM_DMA) += of_reserved_mem_dma.o > diff --git a/drivers/of/of_reserved_mem_cma.c b/drivers/of/of_reserved_mem_cma.c > new file mode 100644 > index 000000000000..601d80655102 > --- /dev/null > +++ b/drivers/of/of_reserved_mem_cma.c > @@ -0,0 +1,75 @@ > +/* > + * Device tree based initialization code for DMA reserved regions. > + * > + * Copyright (c) 2013, The Linux Foundation. All Rights Reserved. > + * Copyright (c) 2013 Samsung Electronics Co., Ltd. > + * http://www.samsung.com > + * Author: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > + * Author: Josh Cartwright <joshc@xxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation; either version 2 of the > + * License or (at your optional) any later version of the license. > + */ > +#include <linux/err.h> > +#include <linux/of.h> > +#include <linux/of_fdt.h> > +#include <linux/of_platform.h> > +#include <linux/mm.h> > +#include <linux/sizes.h> > +#include <linux/mm_types.h> > +#include <linux/dma-contiguous.h> > +#include <linux/of_reserved_mem.h> > + > +static void rmem_cma_device_init(struct reserved_mem *rmem, > + struct device *dev, > + struct of_phandle_args *args) > +{ > + struct cma *cma = rmem->priv; > + dev_set_cma_area(dev, cma); > +} > + > +static const struct reserved_mem_ops rmem_cma_ops = { > + .device_init = rmem_cma_device_init, > +}; > + > +static int __init rmem_cma_setup(struct reserved_mem *rmem, > + unsigned long node, > + const char *uname) > +{ > + struct cma *cma; > + int err; > + > + if (!of_get_flat_dt_prop(node, "reusable", NULL)) > + return -EINVAL; > + > + err = of_parse_flat_dt_reg(node, uname, &rmem->base, &rmem->size); > + if (!err) > + goto out_done; > + > + rmem->base = 0; > + err = of_parse_flat_dt_size(node, uname, &rmem->size); > + if (err) > + goto out_err; > + > +out_done: Please restrict gotos for error handling. Why not the following: err = of_parse_flat_dt_reg(node, uname, &rmem->base, &rmem->size); if (err) { rmem->base = 0; err = of_parse_flat_dt_size(node, uname, &rmem->size); if (err) goto out_err; } > + err = dma_contiguous_reserve_area(rmem->size, rmem->base, 0, > + &cma); > + if (err) { > + pr_err("Reserved memory: unable to setup CMA region\n"); > + return err; > + } > + > + if (of_get_flat_dt_prop(node, "linux,cma-default", NULL)) > + dma_contiguous_set_default(cma); > + > + rmem->ops = &rmem_cma_ops; > + rmem->priv = cma; > + > + return 0; > +out_err: > + pr_err("Reseved memory: malformed node '%s'.\n", uname); > + return err; > +} > +RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup); > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
