From patchwork Tue Feb 4 12:09:29 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 3575561 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id EA893C02DC for ; Tue, 4 Feb 2014 12:11:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A06A620170 for ; Tue, 4 Feb 2014 12:11:39 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 09B1B2015E for ; Tue, 4 Feb 2014 12:11:38 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WAeq0-0007Cr-Fz; Tue, 04 Feb 2014 12:10:48 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WAepr-0005vN-07; Tue, 04 Feb 2014 12:10:39 +0000 Received: from mailout1.samsung.com ([203.254.224.24]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WAepY-0005rB-Dn for linux-arm-kernel@lists.infradead.org; Tue, 04 Feb 2014 12:10:24 +0000 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0N0H00MF30GLBE30@mailout1.samsung.com> for linux-arm-kernel@lists.infradead.org; Tue, 04 Feb 2014 21:09:57 +0900 (KST) X-AuditID: cbfee61a-b7fb26d00000724f-63-52f0d8941b6e Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 2D.FB.29263.498D0F25; Tue, 04 Feb 2014 21:09:57 +0900 (KST) Received: from amdc1339.mshome.net ([106.116.147.30]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0N0H006N40FZEA91@mmp1.samsung.com>; Tue, 04 Feb 2014 21:09:56 +0900 (KST) From: Marek Szyprowski To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-mm-sig@lists.linaro.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v2 1/5] drivers: of: add initialization code for reserved memory Date: Tue, 04 Feb 2014 13:09:29 +0100 Message-id: <1391515773-6112-2-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1391515773-6112-1-git-send-email-m.szyprowski@samsung.com> References: <1391515773-6112-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWRXUhTYRyHfc/O2Y6j0WEtO5nJGH2AkLkoekMJb7TXi2AKWmSRRz2o5HRu KipUMpzUmjoM08qPTSxyOa2pqStKh6QolaE5yY8hgulcstwitM1yRncPz++B/8Wf5Agf4qFk Tl4hq8xjciVcPj6+vUSdqJtxJ0VZ5zjQX/ueB91qDQe2DH8kYI3LSMBBXz+Arqo7OBzoXAfw g9rFg313G3jQO7WIQcvSNAGNlW04nLQ2cqF5eJ4HX6wOYfCJ/TMGDSMVBPTVh8Mxu4cL9fVm HFocZgD9fRYcOocqcdjVsIZDk9UHYg+ijuYOgH5v1QK0dl8P0GR1FYYGHs3zkM5VQaC56Tdc 1N12G81uL3HQ1KiaQJ0+J4Zq/FGouscEkMcSjl42Jcv2XuHHZLK5OcWs8uT5NH62oWeCUHhz Snx6BygHQylaEEzS1Gn6XusK/o9D6ImFLm6AhVQroNt/3NQC/g5rMFq3ZQOBgUtJae137W4k ooyA9jTjgYhDPeDSHuMqoQUkuY+S0b536YEGp47Sy17b7gEBdYF+6n+MBxKaEtONtTEBHUwh +tnsH25AC3eSLmOCHggMIMgE9rOKDIUqPUsujVQxclVRXlZkRr7cAnYfthzaD9rLoQ1QJJDs EYiPuJOEBFOsKpXbAE1yJCLB2Vc7SpDJlJaxyvzryqJcVmUDh0hcckAwqIlOFFJZTCF7g2UV rPL/ipHBoeXg1M9Pz8fNQYnx2XHX4LwT0yxqRpusKy0i+/So6FKxQZ+aLHYTupWQwTMlmFh3 2W5KIXq9ugjf9kxBQt1Xu8zAXJR2pMkSNmyy+IbjC+uv67Sbm196bRtj5+JAYbRH2e5QGy0j i2GHU1u7XWHr3m9pBbccv5xlb7VhV2OPSXBVNiON4ChVzF99s2iErAIAAA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140204_071020_979374_A9B9992D X-CRM114-Status: GOOD ( 31.01 ) X-Spam-Score: -7.5 (-------) Cc: Mark Rutland , Laura Abbott , Pawel Moll , Arnd Bergmann , Stephen Warren , Josh Cartwright , Benjamin Herrenschmidt , Tomasz Figa , Olof Johansson , Tomasz Figa , Michal Nazarewicz , Rob Herring , Kyungmin Park , Kumar Gala , Grant Likely , Ian Campbell , Nishanth Peethambaran , Sascha Hauer , Marc , Marek Szyprowski X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds device tree support for contiguous and reserved memory regions defined in device tree. Large memory blocks can be reliably reserved only during early boot. This must happen before the whole memory management subsystem is initialized, because we need to ensure that the given contiguous blocks are not yet allocated by kernel. Also it must happen before kernel mappings for the whole low memory are created, to ensure that there will be no mappings (for reserved blocks) or mapping with special properties can be created (for CMA blocks). This all happens before device tree structures are unflattened, so we need to get reserved memory layout directly from fdt. Later, those reserved memory regions are assigned to devices on each device structure initialization. Cc: Benjamin Herrenschmidt Cc: Laura Abbott Signed-off-by: Marek Szyprowski [joshc: rework to implement new DT binding, provide mechanism for plugging in new reserved-memory node handlers via RESERVEDMEM_OF_DECLARE] Signed-off-by: Josh Cartwright [mszyprow: little code cleanup] Signed-off-by: Marek Szyprowski --- drivers/of/Kconfig | 6 + drivers/of/Makefile | 1 + drivers/of/of_reserved_mem.c | 219 +++++++++++++++++++++++++++++++++++++ drivers/of/platform.c | 7 ++ include/asm-generic/vmlinux.lds.h | 11 ++ include/linux/of_reserved_mem.h | 62 +++++++++++ 6 files changed, 306 insertions(+) create mode 100644 drivers/of/of_reserved_mem.c create mode 100644 include/linux/of_reserved_mem.h diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index c6973f101a3e..aba13df56f3a 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -75,4 +75,10 @@ config OF_MTD depends on MTD def_bool y +config OF_RESERVED_MEM + depends on HAVE_MEMBLOCK + def_bool y + help + Helpers to allow for reservation of memory regions + endmenu # OF diff --git a/drivers/of/Makefile b/drivers/of/Makefile index efd05102c405..ed9660adad77 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_OF_MDIO) += of_mdio.o obj-$(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 diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c new file mode 100644 index 000000000000..f17cd56e68d9 --- /dev/null +++ b/drivers/of/of_reserved_mem.c @@ -0,0 +1,219 @@ +/* + * Device tree based initialization code for reserved memory. + * + * Copyright (c) 2013, The Linux Foundation. All Rights Reserved. + * Copyright (c) 2013 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Author: Marek Szyprowski + * Author: Josh Cartwright + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +#define MAX_RESERVED_REGIONS 16 +static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS]; +static int reserved_mem_count; + +int __init of_parse_flat_dt_reg(unsigned long node, const char *uname, + phys_addr_t *base, phys_addr_t *size) +{ + unsigned long len; + __be32 *prop; + + prop = of_get_flat_dt_prop(node, "reg", &len); + if (!prop) + return -EINVAL; + + if (len < (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32)) { + pr_err("Reserved memory: invalid reg property in '%s' node.\n", + uname); + return -EINVAL; + } + + *base = dt_mem_next_cell(dt_root_addr_cells, &prop); + *size = dt_mem_next_cell(dt_root_size_cells, &prop); + return 0; +} + +int __init of_parse_flat_dt_size(unsigned long node, const char *uname, + phys_addr_t *size) +{ + unsigned long len; + __be32 *prop; + + prop = of_get_flat_dt_prop(node, "size", &len); + if (!prop) + return -EINVAL; + + if (len < dt_root_size_cells * sizeof(__be32)) { + pr_err("Reserved memory: invalid size property in '%s' node.\n", + uname); + return -EINVAL; + } + + *size = dt_mem_next_cell(dt_root_size_cells, &prop); + return 0; +} + +static int __init rmem_default_early_setup(struct reserved_mem *rmem, + unsigned long node, + const char *uname) +{ + int err; + + if (of_get_flat_dt_prop(node, "compatible", NULL)) + return -EINVAL; + + err = of_parse_flat_dt_reg(node, uname, &rmem->base, &rmem->size); + if (err) + return err; + + if (of_get_flat_dt_prop(node, "no-map", NULL)) + err = memblock_remove(rmem->base, rmem->size); + else + err = memblock_reserve(rmem->base, rmem->size); + + if (err == 0) + pr_info("Reserved memory: found '%s', memory base %pa, size %ld MiB\n", + uname, &rmem->base, (unsigned long)rmem->size / SZ_1M); + + return err; +} + +static const struct of_device_id rmem_default_id + __used __section(__reservedmem_of_table_end) = { + .data = rmem_default_early_setup, +}; + +static int __init fdt_scan_reserved_mem(unsigned long node, const char *uname, + int depth, void *data) +{ + struct reserved_mem *rmem = &reserved_mem[reserved_mem_count]; + extern const struct of_device_id __reservedmem_of_table[]; + const struct of_device_id *id; + const char *status; + + if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) { + pr_err("Reserved memory: not enough space all defined regions.\n"); + return -ENOSPC; + } + + status = of_get_flat_dt_prop(node, "status", NULL); + if (status && strcmp(status, "okay") != 0) + return 0; + + /* + * The default handler above ensures this section is terminated with a + * id whose compatible string is empty + */ + for (id = __reservedmem_of_table; id <= &rmem_default_id; id++) { + reservedmem_of_init_fn initfn = id->data; + const char *compat = id->compatible; + + if (compat[0] && !of_flat_dt_is_compatible(node, compat)) + continue; + + if (initfn(rmem, node, uname) == 0) { + pr_info("Reserved memory: created %s node, compatible id %s\n", + uname, compat); + rmem->name = uname; + reserved_mem_count++; + break; + } + } + + return 0; +} + +static struct reserved_mem *find_rmem(struct device_node *np) +{ + const char *name; + unsigned int i; + + name = kbasename(np->full_name); + + for (i = 0; i < reserved_mem_count; i++) + if (strcmp(name, reserved_mem[i].name) == 0) + return &reserved_mem[i]; + + return NULL; +} + +/** + * of_reserved_mem_device_init() - assign reserved memory region to given device + * + * This function assign memory region pointed by "memory-region" device tree + * property to the given device. + */ +void of_reserved_mem_device_init(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct reserved_mem *rmem; + struct of_phandle_args s; + unsigned int i; + + for (i = 0; of_parse_phandle_with_args(np, "memory-region", + "#memory-region-cells", i, &s) == 0; i++) { + + rmem = find_rmem(s.np); + if (!rmem || !rmem->ops || !rmem->ops->device_init) { + of_node_put(s.np); + continue; + } + + rmem->ops->device_init(rmem, dev, &s); + dev_info(dev, "assigned reserved memory node %s\n", + rmem->name); + of_node_put(s.np); + break; + } +} + +/** + * of_reserved_mem_device_release() - release reserved memory device structures + * + * This function releases structures allocated for memory region handling for + * the given device. + */ +void of_reserved_mem_device_release(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct reserved_mem *rmem; + struct of_phandle_args s; + unsigned int i; + + for (i = 0; of_parse_phandle_with_args(np, "memory-region", + "#memory-region-cells", i, &s) == 0; i++) { + + rmem = find_rmem(s.np); + if (rmem && rmem->ops && rmem->ops->device_release) + rmem->ops->device_release(rmem, dev); + + of_node_put(s.np); + } +} + +/** + * early_init_dt_scan_reserved_mem() - create reserved memory regions + * + * This function grabs memory from early allocator for device exclusive use + * defined in device tree structures. It should be called by arch specific code + * once the early allocator (memblock) has been activated and all other + * subsystems have already allocated/reserved memory. + */ +void __init early_init_dt_scan_reserved_mem(void) +{ + of_scan_flat_dt_by_path("/reserved-memory", fdt_scan_reserved_mem, + NULL); +} diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 404d1daebefa..3df0b1826e8b 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -21,6 +21,7 @@ #include #include #include +#include #include const struct of_device_id of_default_bus_match_table[] = { @@ -220,6 +221,8 @@ static struct platform_device *of_platform_device_create_pdata( dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; + of_reserved_mem_device_init(&dev->dev); + /* We do not fill the DMA ops for platform devices by default. * This is currently the responsibility of the platform code * to do such, possibly using a device notifier @@ -227,6 +230,7 @@ static struct platform_device *of_platform_device_create_pdata( if (of_device_add(dev) != 0) { platform_device_put(dev); + of_reserved_mem_device_release(&dev->dev); return NULL; } @@ -282,6 +286,8 @@ static struct amba_device *of_amba_device_create(struct device_node *node, else of_device_make_bus_id(&dev->dev); + of_reserved_mem_device_init(&dev->dev); + /* Allow the HW Peripheral ID to be overridden */ prop = of_get_property(node, "arm,primecell-periphid", NULL); if (prop) @@ -308,6 +314,7 @@ static struct amba_device *of_amba_device_create(struct device_node *node, return dev; err_free: + of_reserved_mem_device_release(&dev->dev); amba_device_put(dev); return NULL; } diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index bc2121fa9132..f10f64fcc815 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -167,6 +167,16 @@ #define CLK_OF_TABLES() #endif +#ifdef CONFIG_OF_RESERVED_MEM +#define RESERVEDMEM_OF_TABLES() \ + . = ALIGN(8); \ + VMLINUX_SYMBOL(__reservedmem_of_table) = .; \ + *(__reservedmem_of_table) \ + *(__reservedmem_of_table_end) +#else +#define RESERVEDMEM_OF_TABLES() +#endif + #define KERNEL_DTB() \ STRUCT_ALIGN(); \ VMLINUX_SYMBOL(__dtb_start) = .; \ @@ -490,6 +500,7 @@ TRACE_SYSCALLS() \ MEM_DISCARD(init.rodata) \ CLK_OF_TABLES() \ + RESERVEDMEM_OF_TABLES() \ CLKSRC_OF_TABLES() \ KERNEL_DTB() \ IRQCHIP_OF_MATCH_TABLE() diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h new file mode 100644 index 000000000000..41f43828e1db --- /dev/null +++ b/include/linux/of_reserved_mem.h @@ -0,0 +1,62 @@ +#ifndef __OF_RESERVED_MEM_H +#define __OF_RESERVED_MEM_H + +struct cma; +struct platform_device; +struct of_phandle_args; +struct reserved_mem_ops; + +struct reserved_mem { + const char *name; + const struct reserved_mem_ops *ops; + phys_addr_t base; + phys_addr_t size; + void *priv; +}; + +struct reserved_mem_ops { + void (*device_init)(struct reserved_mem *rmem, + struct device *dev, + struct of_phandle_args *args); + void (*device_release)(struct reserved_mem *rmem, + struct device *dev); +}; + +typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem, + unsigned long node, const char *uname); + +#ifdef CONFIG_OF_RESERVED_MEM +void of_reserved_mem_device_init(struct device *dev); +void of_reserved_mem_device_release(struct device *dev); +void early_init_dt_scan_reserved_mem(void); + +int of_parse_flat_dt_reg(unsigned long node, const char *uname, + phys_addr_t *base, phys_addr_t *size); +int of_parse_flat_dt_size(unsigned long node, const char *uname, + phys_addr_t *size); + +#define RESERVEDMEM_OF_DECLARE(name, compat, init) \ + static const struct of_device_id __reservedmem_of_table_##name \ + __used __section(__reservedmem_of_table) \ + = { .compatible = compat, \ + .data = (init == (reservedmem_of_init_fn)NULL) ? \ + init : init } + +#else +static inline void of_reserved_mem_device_init(struct device *dev) { } + +static inline +void of_reserved_mem_device_release(struct device *dev) { } + +static inline void early_init_dt_scan_reserved_mem(void) { } + +#define RESERVEDMEM_OF_DECLARE(name, compat, init) \ + static const struct of_device_id __reservedmem_of_table_##name \ + __attribute__((unused)) \ + = { .compatible = compat, \ + .data = (init == (reservedmem_of_init_fn)NULL) ? \ + init : init } + +#endif + +#endif /* __OF_RESERVED_MEM_H */