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Mon, 13 May 2019 16:09:53 +0000 From: Roy Pledge To: "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Leo Li Subject: [PATCH v1 8/8] soc/fsl/qbman: Update device tree with reserved memory Thread-Topic: [PATCH v1 8/8] soc/fsl/qbman: Update device tree with reserved memory Thread-Index: AQHVCaZMC9A3JXjA7EWmSckX0C+ZXA== Date: Mon, 13 May 2019 16:09:53 +0000 Message-ID: <1557763756-24118-9-git-send-email-roy.pledge@nxp.com> References: <1557763756-24118-1-git-send-email-roy.pledge@nxp.com> In-Reply-To: <1557763756-24118-1-git-send-email-roy.pledge@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: SN4PR0501CA0144.namprd05.prod.outlook.com (2603:10b6:803:2c::22) To DB6PR0402MB2727.eurprd04.prod.outlook.com (2603:10a6:4:98::10) authentication-results: spf=none (sender IP is ) smtp.mailfrom=roy.pledge@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [72.142.119.78] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 895fd7e1-08a3-4e64-1402-08d6d7bd6f49 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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If a dynamic allocation was selected (where the kernel selects the address for the allocation) convert it to a static allocation by inserting the reg property. This will ensure the same memory is reused after a kexec() Signed-off-by: Roy Pledge --- drivers/soc/fsl/qbman/dpaa_sys.c | 58 ++++++++++++++++++++++++---------------- 1 file changed, 35 insertions(+), 23 deletions(-) diff --git a/drivers/soc/fsl/qbman/dpaa_sys.c b/drivers/soc/fsl/qbman/dpaa_sys.c index 0b901a8..9dd8bb5 100644 --- a/drivers/soc/fsl/qbman/dpaa_sys.c +++ b/drivers/soc/fsl/qbman/dpaa_sys.c @@ -37,41 +37,53 @@ int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr, size_t *size) { - int ret; struct device_node *mem_node; - u64 size64; struct reserved_mem *rmem; + struct property *prop; + int len, err; + __be32 *res_array; - ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, idx); - if (ret) { - dev_err(dev, - "of_reserved_mem_device_init_by_idx(%d) failed 0x%x\n", - idx, ret); - return -ENODEV; - } mem_node = of_parse_phandle(dev->of_node, "memory-region", idx); - if (mem_node) { - ret = of_property_read_u64(mem_node, "size", &size64); - if (ret) { - dev_err(dev, "of_address_to_resource fails 0x%x\n", - ret); - return -ENODEV; - } - *size = size64; - } else { + if (!mem_node) { dev_err(dev, "No memory-region found for index %d\n", idx); return -ENODEV; } rmem = of_reserved_mem_lookup(mem_node); + if (!rmem) { + dev_err(dev, "of_reserved_mem_lookup() returned NULL\n"); + return -ENODEV; + } *addr = rmem->base; + *size = rmem->size; /* - * Disassociate the reserved memory area from the device - * because a device can only have one DMA memory area. This - * should be fine since the memory is allocated and initialized - * and only ever accessed by the QBMan device from now on + * Check if the reg property exists - if not insert the node + * so upon kexec() the same memory region address will be preserved. + * This is needed because QBMan HW does not allow the base address/ + * size to be modified once set. */ - of_reserved_mem_device_release(dev); + prop = of_find_property(mem_node, "reg", &len); + if (!prop) { + prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL); + if (!prop) + return -ENOMEM; + prop->value = res_array = devm_kzalloc(dev, sizeof(__be32) * 4, + GFP_KERNEL); + if (!prop->value) + return -ENOMEM; + res_array[0] = cpu_to_be32(upper_32_bits(*addr)); + res_array[1] = cpu_to_be32(lower_32_bits(*addr)); + res_array[2] = cpu_to_be32(upper_32_bits(*size)); + res_array[3] = cpu_to_be32(lower_32_bits(*size)); + prop->length = sizeof(__be32) * 4; + prop->name = devm_kstrdup(dev, "reg", GFP_KERNEL); + if (!prop->name) + return -ENOMEM; + err = of_add_property(mem_node, prop); + if (err) + return err; + } + return 0; }