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Mon, 4 Dec 2023 18:54:48 GMT Received: from hu-obabatun-lv.qualcomm.com (10.49.16.6) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Mon, 4 Dec 2023 10:54:44 -0800 From: Oreoluwa Babatunde To: , , , , , , , , , , , , , , , , , , CC: , , , , , Oreoluwa Babatunde Subject: [RFC PATCH v2 4/6] of: reserved_mem: Add code to use unflattened DT for reserved_mem nodes Date: Mon, 4 Dec 2023 10:54:07 -0800 Message-ID: <20231204185409.19615-5-quic_obabatun@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231204185409.19615-1-quic_obabatun@quicinc.com> References: <20231204185409.19615-1-quic_obabatun@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: Y9jy15O_9Una5HJKHqBfrZ6rgo-58BFN X-Proofpoint-ORIG-GUID: Y9jy15O_9Una5HJKHqBfrZ6rgo-58BFN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-04_18,2023-12-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxlogscore=558 mlxscore=0 suspectscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 clxscore=1015 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2312040146 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231204_105604_855307_54108D07 X-CRM114-Status: GOOD ( 30.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The unflattened devicetree APIs are available to be used right after paging_init() runs. Therefore, use the unflattened devicetree APIs to process the reserved memory regions from this point. Using the unflattened devicetree APIs is more efficient than using the flattened devicetree APIs. Signed-off-by: Oreoluwa Babatunde --- drivers/of/fdt.c | 51 +-------------------- drivers/of/of_private.h | 4 +- drivers/of/of_reserved_mem.c | 79 +++++++++++++++++++++++++-------- include/linux/of_fdt.h | 1 - include/linux/of_reserved_mem.h | 2 +- kernel/dma/coherent.c | 4 +- kernel/dma/contiguous.c | 8 ++-- kernel/dma/swiotlb.c | 10 ++--- 8 files changed, 76 insertions(+), 83 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 46adce306bbd..12769dd53c34 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -558,55 +558,6 @@ static int __init __reserved_mem_check_root(unsigned long node) return 0; } -/* - * Save the reserved_mem reg nodes in the reserved_mem array - */ -void __init fdt_scan_reserved_mem_reg_nodes(void) - -{ - int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); - const void *fdt = initial_boot_params; - phys_addr_t base, size; - const __be32 *prop; - int node, child; - int len; - - node = fdt_path_offset(fdt, "/reserved-memory"); - if (node < 0) { - pr_err("Reserved memory: Did not find reserved-memory node\n"); - return; - } - - if (__reserved_mem_check_root(node) != 0) { - pr_err("Reserved memory: unsupported node format, ignoring\n"); - return; - } - - fdt_for_each_subnode(child, fdt, node) { - const char *uname; - - prop = of_get_flat_dt_prop(child, "reg", &len); - if (!prop) - continue; - - if (!of_fdt_device_is_available(fdt, child)) - continue; - - uname = fdt_get_name(fdt, child, NULL); - if (len && len % t_len != 0) { - pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", - uname); - continue; - } - - base = dt_mem_next_cell(dt_root_addr_cells, &prop); - size = dt_mem_next_cell(dt_root_size_cells, &prop); - - if (size) - fdt_reserved_mem_save_node(child, uname, base, size); - } -} - /* * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory. */ @@ -1393,7 +1344,7 @@ void __init unflatten_device_tree(void) unittest_unflatten_overlay_base(); /*Initialize the reserved_mem regions*/ - fdt_init_reserved_mem(); + init_reserved_mem(); } /** diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 57694a704b00..575e2b4119e0 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -176,8 +176,8 @@ static inline struct device_node *__of_get_dma_parent(const struct device_node * } #endif -void fdt_init_reserved_mem(void); -void fdt_reserved_mem_save_node(unsigned long node, const char *uname, +void init_reserved_mem(void); +void dt_reserved_mem_save_node(struct device_node *node, const char *uname, phys_addr_t base, phys_addr_t size); #endif /* _LINUX_OF_PRIVATE_H */ diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index d62f1956024c..2ef9edcb8c93 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -55,9 +55,9 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, } /* - * fdt_reserved_mem_save_node() - save fdt node for second pass initialization + * dt_reserved_mem_save_node() - save dt node for second pass initialization */ -void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname, +void __init dt_reserved_mem_save_node(struct device_node *node, const char *uname, phys_addr_t base, phys_addr_t size) { struct reserved_mem *rmem = &reserved_mem[reserved_mem_count]; @@ -67,7 +67,7 @@ void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname, return; } - rmem->fdt_node = node; + rmem->dev_node = node; rmem->name = uname; rmem->base = base; rmem->size = size; @@ -76,6 +76,54 @@ void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname, return; } +/* + * Save the reserved_mem reg nodes in the reserved_mem array + */ +static void __init scan_reserved_mem_reg_nodes(void) + +{ + int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); + struct device_node *node, *child; + phys_addr_t base, size; + const __be32 *prop; + int len; + + node = of_find_node_by_path("/reserved-memory"); + if (node < 0) { + pr_err("Reserved memory: Did not find reserved-memory node\n"); + return; + } + + for_each_child_of_node(node, child) { + const char *uname; + struct reserved_mem *rmem; + + if (!of_device_is_available(child)) + continue; + + prop = of_get_property(child, "reg", &len); + if (!prop) { + rmem = of_reserved_mem_lookup(child); + if (rmem) + rmem->dev_node = child; + continue; + } + + uname = of_node_full_name(child); + if (len && len % t_len != 0) { + pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", + uname); + continue; + } + + base = dt_mem_next_cell(dt_root_addr_cells, &prop); + size = dt_mem_next_cell(dt_root_size_cells, &prop); + + if (size) + dt_reserved_mem_save_node(child, uname, base, size); + } +} + /* * __reserved_mem_alloc_in_range() - allocate reserved memory described with * 'alloc-ranges'. Choose bottom-up/top-down depending on nearby existing @@ -210,7 +258,7 @@ int __init __reserved_mem_alloc_size(unsigned long node, const char *uname) uname, (unsigned long)(size / SZ_1M)); return -ENOMEM; } - fdt_reserved_mem_save_node(node, uname, base, size); + dt_reserved_mem_save_node(NULL, uname, base, size); return 0; } @@ -230,7 +278,7 @@ static int __init __reserved_mem_init_node(struct reserved_mem *rmem) reservedmem_of_init_fn initfn = i->data; const char *compat = i->compatible; - if (!of_flat_dt_is_compatible(rmem->fdt_node, compat)) + if (!of_device_is_compatible(rmem->dev_node, compat)) continue; ret = initfn(rmem); @@ -263,11 +311,6 @@ static int __init __rmem_cmp(const void *a, const void *b) if (ra->size > rb->size) return 1; - if (ra->fdt_node < rb->fdt_node) - return -1; - if (ra->fdt_node > rb->fdt_node) - return 1; - return 0; } @@ -299,29 +342,29 @@ static void __init __rmem_check_for_overlap(void) } /** - * fdt_init_reserved_mem() - allocate and init all saved reserved memory regions + * init_reserved_mem() - allocate and init all saved reserved memory regions */ -void __init fdt_init_reserved_mem(void) +void __init init_reserved_mem(void) { int i; - fdt_scan_reserved_mem_reg_nodes(); + scan_reserved_mem_reg_nodes(); /* check for overlapping reserved regions */ __rmem_check_for_overlap(); for (i = 0; i < reserved_mem_count; i++) { struct reserved_mem *rmem = &reserved_mem[i]; - unsigned long node = rmem->fdt_node; + struct device_node *node = rmem->dev_node; int len; const __be32 *prop; int err = 0; bool nomap; - nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; - prop = of_get_flat_dt_prop(node, "phandle", &len); + nomap = of_get_property(node, "no-map", NULL) != NULL; + prop = of_get_property(node, "phandle", &len); if (!prop) - prop = of_get_flat_dt_prop(node, "linux,phandle", &len); + prop = of_get_property(node, "linux,phandle", &len); if (prop) rmem->phandle = of_read_number(prop, len/4); @@ -337,7 +380,7 @@ void __init fdt_init_reserved_mem(void) } else { phys_addr_t end = rmem->base + rmem->size - 1; bool reusable = - (of_get_flat_dt_prop(node, "reusable", NULL)) != NULL; + (of_get_property(node, "reusable", NULL)) != NULL; pr_info("%pa..%pa (%lu KiB) %s %s %s\n", &rmem->base, &end, (unsigned long)(rmem->size / SZ_1K), diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index 7b2a5d93d719..d69ad5bb1eb1 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -73,7 +73,6 @@ extern int early_init_dt_scan_root(void); extern bool early_init_dt_scan(void *params); extern bool early_init_dt_verify(void *params); extern void early_init_dt_scan_nodes(void); -extern void fdt_scan_reserved_mem_reg_nodes(void); extern const char *of_flat_dt_get_machine_name(void); extern const void *of_flat_dt_match_machine(const void *default_match, diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h index dc13bcd04b12..2b205ce6beb9 100644 --- a/include/linux/of_reserved_mem.h +++ b/include/linux/of_reserved_mem.h @@ -10,7 +10,7 @@ struct reserved_mem_ops; struct reserved_mem { const char *name; - unsigned long fdt_node; + struct device_node *dev_node; unsigned long phandle; const struct reserved_mem_ops *ops; phys_addr_t base; diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index c21abc77c53e..3eba9678dc33 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -360,9 +360,9 @@ static const struct reserved_mem_ops rmem_dma_ops = { static int __init rmem_dma_setup(struct reserved_mem *rmem) { - unsigned long node = rmem->fdt_node; + struct device_node *node = rmem->dev_node; - if (of_get_flat_dt_prop(node, "reusable", NULL)) + if (of_get_property(node, "reusable", NULL)) return -EINVAL; #ifdef CONFIG_ARM diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index f005c66f378c..b54cf128a9d9 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -462,8 +462,8 @@ static const struct reserved_mem_ops rmem_cma_ops = { static int __init rmem_cma_setup(struct reserved_mem *rmem) { - unsigned long node = rmem->fdt_node; - bool default_cma = of_get_flat_dt_prop(node, "linux,cma-default", NULL); + struct device_node *node = rmem->dev_node; + bool default_cma = of_get_property(node, "linux,cma-default", NULL); struct cma *cma; int err; @@ -473,8 +473,8 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem) return -EBUSY; } - if (!of_get_flat_dt_prop(node, "reusable", NULL) || - of_get_flat_dt_prop(node, "no-map", NULL)) + if (!of_get_property(node, "reusable", NULL) || + of_get_property(node, "no-map", NULL)) return -EINVAL; if (!IS_ALIGNED(rmem->base | rmem->size, CMA_MIN_ALIGNMENT_BYTES)) { diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 33d942615be5..14840a58a6e6 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -1709,12 +1709,12 @@ static const struct reserved_mem_ops rmem_swiotlb_ops = { static int __init rmem_swiotlb_setup(struct reserved_mem *rmem) { - unsigned long node = rmem->fdt_node; + struct device_node *node = rmem->dev_node; - if (of_get_flat_dt_prop(node, "reusable", NULL) || - of_get_flat_dt_prop(node, "linux,cma-default", NULL) || - of_get_flat_dt_prop(node, "linux,dma-default", NULL) || - of_get_flat_dt_prop(node, "no-map", NULL)) + if (of_get_property(node, "reusable", NULL) || + of_get_property(node, "linux,cma-default", NULL) || + of_get_property(node, "linux,dma-default", NULL) || + of_get_property(node, "no-map", NULL)) return -EINVAL; rmem->ops = &rmem_swiotlb_ops;