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Mon, 4 Dec 2023 04:14:05 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; Sun, 3 Dec 2023 20:14:02 -0800 From: Oreoluwa Babatunde To: , , , CC: , , , , , Oreoluwa Babatunde Subject: [RFC PATCH v2 5/6] of: reserved_mem: Add code to dynamically allocate reserved_mem array Date: Sun, 3 Dec 2023 20:13:38 -0800 Message-ID: <20231204041339.9902-6-quic_obabatun@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231204041339.9902-1-quic_obabatun@quicinc.com> References: <20231204041339.9902-1-quic_obabatun@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) 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-ORIG-GUID: A8SsO6wWn22noIW1LxRR94xcAmw0O5LG X-Proofpoint-GUID: A8SsO6wWn22noIW1LxRR94xcAmw0O5LG 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_01,2023-11-30_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 mlxscore=0 bulkscore=0 spamscore=0 clxscore=1015 priorityscore=1501 mlxlogscore=633 malwarescore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2312040029 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231203_201428_159054_926A198C X-CRM114-Status: GOOD ( 25.65 ) 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 reserved_mem array is statically allocated with a size of MAX_RESERVED_REGIONS(64). Therefore, if the number of reserved_mem regions exceeds this size, there will not be enough space to store all the data. Therefore, extend the use of the static array by introducing a dynamically allocated array based on the number of reserved memory regions specified in the DT. Before paging_init() runs, the static array is used to store the dynamically-placed regions. After paging_init(), memory is dynamically allocated for the reserved_mem array, and all entries from the static array is copied over to the new array, and all other statically-placed regions are added in as well. Signed-off-by: Oreoluwa Babatunde --- drivers/of/fdt.c | 13 +++++++--- drivers/of/of_private.h | 1 + drivers/of/of_reserved_mem.c | 48 +++++++++++++++++++++++++++++++++--- 3 files changed, 55 insertions(+), 7 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 12769dd53c34..2f1eabbd6869 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -563,8 +563,8 @@ static int __init __reserved_mem_check_root(unsigned long node) */ static int __init fdt_scan_reserved_mem(void) { - int node, child; - int dynamic_nodes_cnt = 0; + int node, child, err = 0; + int dynamic_nodes_cnt = 0, count = 0; int dynamic_nodes[MAX_RESERVED_REGIONS]; const void *fdt = initial_boot_params; @@ -579,7 +579,6 @@ static int __init fdt_scan_reserved_mem(void) fdt_for_each_subnode(child, fdt, node) { const char *uname; - int err; if (!of_fdt_device_is_available(fdt, child)) continue; @@ -587,6 +586,8 @@ static int __init fdt_scan_reserved_mem(void) uname = fdt_get_name(fdt, child, NULL); err = __reserved_mem_reserve_reg(child, uname); + if (!err) + count++; if (err == -ENOENT && of_get_flat_dt_prop(child, "size", NULL)) { dynamic_nodes[dynamic_nodes_cnt] = child; @@ -600,8 +601,12 @@ static int __init fdt_scan_reserved_mem(void) child = dynamic_nodes[i]; uname = fdt_get_name(fdt, child, NULL); - __reserved_mem_alloc_size(child, uname); + err = __reserved_mem_alloc_size(child, uname); + if (!err) + count++; } + update_reserved_mem_max_cnt(count); + return 0; } diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 575e2b4119e0..ef56b2ea185c 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -179,5 +179,6 @@ static inline struct device_node *__of_get_dma_parent(const struct device_node * 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); +void update_reserved_mem_max_cnt(int max_count); #endif /* _LINUX_OF_PRIVATE_H */ diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 2ef9edcb8c93..01cd6a571dc2 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -26,7 +26,9 @@ #include "of_private.h" -static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS]; +static struct reserved_mem reserved_mem_array[MAX_RESERVED_REGIONS]; +static struct reserved_mem *reserved_mem = reserved_mem_array; +static int total_reserved_mem_cnt = MAX_RESERVED_REGIONS; static int reserved_mem_count; static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, @@ -54,6 +56,42 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, return err; } +void __init update_reserved_mem_max_cnt(int max_count) +{ + total_reserved_mem_cnt = max_count; +} + +static int alloc_reserved_mem_array(void) +{ + struct reserved_mem *new_array; + size_t alloc_size, copy_size, memset_size; + + alloc_size = array_size(total_reserved_mem_cnt, sizeof(*new_array)); + if (alloc_size == SIZE_MAX) + return -1; + + new_array = memblock_alloc(alloc_size, SMP_CACHE_BYTES); + if (!new_array) + return -ENOMEM; + + copy_size = array_size(reserved_mem_count, sizeof(*new_array)); + if (copy_size == SIZE_MAX) + goto overlow_err; + + memset_size = alloc_size - copy_size; + + memcpy(new_array, reserved_mem, copy_size); + memset(new_array + reserved_mem_count, 0, memset_size); + + reserved_mem = new_array; + return 0; + +overlow_err: + memblock_free(new_array, alloc_size); + total_reserved_mem_cnt = MAX_RESERVED_REGIONS; + return -1; +} + /* * dt_reserved_mem_save_node() - save dt node for second pass initialization */ @@ -62,7 +100,7 @@ void __init dt_reserved_mem_save_node(struct device_node *node, const char *unam { struct reserved_mem *rmem = &reserved_mem[reserved_mem_count]; - if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) { + if (reserved_mem_count == total_reserved_mem_cnt) { pr_err("not enough space for all defined regions.\n"); return; } @@ -346,7 +384,11 @@ static void __init __rmem_check_for_overlap(void) */ void __init init_reserved_mem(void) { - int i; + int i, ret; + + ret = alloc_reserved_mem_array(); + if (ret) + pr_err("Failed to allocate memory for reserved_mem array with err: %d", ret); scan_reserved_mem_reg_nodes();