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Sun, 08 Mar 2026 12:34:40 -0700 (PDT) X-Received: by 2002:a05:6a00:7483:b0:829:710d:a46b with SMTP id d2e1a72fcca58-829a2f7b48emr7158286b3a.41.1772998480388; Sun, 08 Mar 2026 12:34:40 -0700 (PDT) Received: from hu-vjitta-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829a4676593sm7818909b3a.28.2026.03.08.12.34.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Mar 2026 12:34:39 -0700 (PDT) From: Vijayanand Jitta Date: Mon, 09 Mar 2026 01:03:39 +0530 Subject: [PATCH v10 3/3] of: Respect #{iommu,msi}-cells in maps MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260309-parse_iommu_cells-v10-3-c62fcaa5a1d8@oss.qualcomm.com> References: <20260309-parse_iommu_cells-v10-0-c62fcaa5a1d8@oss.qualcomm.com> In-Reply-To: <20260309-parse_iommu_cells-v10-0-c62fcaa5a1d8@oss.qualcomm.com> To: Nipun Gupta , Nikhil Agarwal , Joerg Roedel , Will Deacon , Robin Murphy , Marc Zyngier , Lorenzo Pieralisi , Thomas Gleixner , Saravana Kannan , Richard Zhu , Lucas Stach , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , Bjorn Helgaas , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dmitry Baryshkov , Konrad Dybcio , Bjorn Andersson , Rob Herring , Conor Dooley , Krzysztof Kozlowski , Prakash Gupta , Vikash Garodia Cc: linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, imx@lists.linux.dev, xen-devel@lists.xenproject.org, linux-arm-msm@vger.kernel.org, Vijayanand Jitta , Charan Teja Kalla X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1772998436; l=10158; i=vijayanand.jitta@oss.qualcomm.com; s=20260301; h=from:subject:message-id; bh=Y3y9pnEGS/egnRkn7PRxW9/ZOSrIlXJJq3NDQFYUkD4=; b=JZchFxd3ySsovmwflK1CY4cBpmFZDZuap26lOuWwIhv+ZaGNWH/gkD4Mmfup1E8EbC1OrXdH4 VkkiDPdY1+8At/dTkuN9k5uBn4Rr7Byfuai9q397xPmXXKr22BEBwBT X-Developer-Key: i=vijayanand.jitta@oss.qualcomm.com; a=ed25519; pk=Lpi7Cs3wHe8KZtqvyci7FTOLzsKpEHKGCaPNZw+1zRI= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA4MDE4MSBTYWx0ZWRfX33iirEw5Bbup Bu4vsuHFPfy+W7bfWha5Y46hO+H8tw8N8N9N09yM2VvFkZ5BggvGhch21+jX80kVDVLQOxpe0Gc R14KU0Rpr70fF1fWU5spVjQjNxiPseEzPJn/UNEKfCl3G/jMs/yJWakCm3jme9ogcOMZfS2MhMB VYTXhPJZAwovQpNPxgMnLY/H/GhExukZzY8dLqujww7XFOmr3fn0HJQENrRgd1PvAisMJIc4qOu rzWXIzY6EIfvrUSL6z5+T0cZrB3BcOMkaNZh33aBSqIxsfhR826S7t4g27vG8XbiD726RCfBnb2 EOok4aAl7WMpSQlyq1pwpN+FjlOIUJzxAOuMyclrqkU6iWAg+QP6HhVTVT6JUk51E7XAJchG0NA jZOQd1U67O/PU71MZ6OzA0Fw8jOooUnOKw+69G/eSnLs32XPtARRxvBay3YJ9s0Hyh1rVySGVNX CWHLYDbNGSOFj7/XYrg== X-Proofpoint-ORIG-GUID: yjRDAohlDhPSGjJn56efzHQtq1pgS18k X-Proofpoint-GUID: yjRDAohlDhPSGjJn56efzHQtq1pgS18k X-Authority-Analysis: v=2.4 cv=e7sLiKp/ c=1 sm=1 tr=0 ts=69adcf52 cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=wJGdY9mNwEi-N7fqGJcA:9 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-08_05,2026-03-06_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 suspectscore=0 spamscore=0 bulkscore=0 impostorscore=0 malwarescore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603080181 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260308_123443_218241_A4AAD897 X-CRM114-Status: GOOD ( 30.76 ) 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 From: Robin Murphy So far our parsing of {iommu,msi}-map properites has always blindly assumed that the output specifiers will always have exactly 1 cell. This typically does happen to be the case, but is not actually enforced (and the PCI msi-map binding even explicitly states support for 0 or 1 cells) - as a result we've now ended up with dodgy DTs out in the field which depend on this behaviour to map a 1-cell specifier for a 2-cell provider, despite that being bogus per the bindings themselves. Since there is some potential use in being able to map at least single input IDs to multi-cell output specifiers (and properly support 0-cell outputs as well), add support for properly parsing and using the target nodes' #cells values, albeit with the unfortunate complication of still having to work around expectations of the old behaviour too. Since there are multi-cell output specifiers, the callers of of_map_id() may need to get the exact cell output value for further processing. Added support for that part --charan Signed-off-by: Robin Murphy Signed-off-by: Charan Teja Kalla Signed-off-by: Vijayanand Jitta --- drivers/iommu/of_iommu.c | 2 +- drivers/of/base.c | 129 ++++++++++++++++++++++++++++++++++++++--------- include/linux/of.h | 6 ++- 3 files changed, 109 insertions(+), 28 deletions(-) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index d255d0f58e8c..a18bb60f6f3d 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -45,7 +45,7 @@ static int of_iommu_configure_dev_id(struct device_node *master_np, struct device *dev, const u32 *id) { - struct of_phandle_args iommu_spec = { .args_count = 1 }; + struct of_phandle_args iommu_spec = {}; int err; err = of_map_iommu_id(master_np, *id, &iommu_spec); diff --git a/drivers/of/base.c b/drivers/of/base.c index b6e07c5fe715..9c44eb6d445d 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2096,16 +2096,46 @@ int of_find_last_cache_level(unsigned int cpu) return cache_level; } +/* + * Some DTs have an iommu-map targeting a 2-cell IOMMU node while + * specifying only 1 cell. Fortunately they all consist of value '1' + * as the 2nd cell entry with the same target, so check for that pattern. + * + * Example: + * IOMMU node: + * #iommu-cells = <2>; + * + * Device node: + * iommu-map = <0x0000 &smmu 0x0000 0x1>, + * <0x0100 &smmu 0x0100 0x1>; + */ +static bool of_check_bad_map(const __be32 *map, int len) +{ + __be32 phandle = map[1]; + + if (len % 4) + return false; + for (int i = 0; i < len; i += 4) { + if (map[i + 1] != phandle || map[i + 3] != cpu_to_be32(1)) + return false; + } + return true; +} + /** * of_map_id - Translate an ID through a downstream mapping. * @np: root complex device node. * @id: device ID to map. * @map_name: property name of the map to use. + * @cells_name: property name of target specifier cells. * @map_mask_name: optional property name of the mask to use. * @arg: pointer to a &struct of_phandle_args. On input, @arg->np may be * set to a target device node to match, or NULL to match any. On * success, @arg->np will be set to the matched target node (with a - * reference held) and @arg->args[0] will contain the translated ID. + * reference held), @arg->args_count will be set to the number of + * output specifier cells as defined by @cells_name in the target node, + * and @arg->args[0..args_count-1] will contain the translated output + * specifier values. * * Given a device ID, look up the appropriate implementation-defined * platform ID and/or the target device which receives transactions on that @@ -2117,17 +2147,19 @@ int of_find_last_cache_level(unsigned int cpu) * Return: 0 on success or a standard error code on failure. */ int of_map_id(const struct device_node *np, u32 id, - const char *map_name, const char *map_mask_name, + const char *map_name, const char *cells_name, + const char *map_mask_name, struct of_phandle_args *arg) { u32 map_mask, masked_id; - int map_len; + int map_bytes, map_len, offset = 0; + bool bad_map = false; const __be32 *map = NULL; if (!np || !map_name || !arg) return -EINVAL; - map = of_get_property(np, map_name, &map_len); + map = of_get_property(np, map_name, &map_bytes); if (!map) { if (arg->np) return -ENODEV; @@ -2136,11 +2168,9 @@ int of_map_id(const struct device_node *np, u32 id, return 0; } - if (!map_len || map_len % (4 * sizeof(*map))) { - pr_err("%pOF: Error: Bad %s length: %d\n", np, - map_name, map_len); - return -EINVAL; - } + if (map_bytes % sizeof(*map)) + goto err_map_len; + map_len = map_bytes / sizeof(*map); /* The default is to select all bits. */ map_mask = 0xffffffff; @@ -2153,27 +2183,69 @@ int of_map_id(const struct device_node *np, u32 id, of_property_read_u32(np, map_mask_name, &map_mask); masked_id = map_mask & id; - for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) { + + while (offset < map_len) { struct device_node *phandle_node; - u32 id_base = be32_to_cpup(map + 0); - u32 phandle = be32_to_cpup(map + 1); - u32 out_base = be32_to_cpup(map + 2); - u32 id_len = be32_to_cpup(map + 3); + u32 id_base, phandle, id_len, id_off, cells = 0; + const __be32 *out_base; + + if (map_len - offset < 2) + goto err_map_len; + + id_base = be32_to_cpup(map + offset); if (id_base & ~map_mask) { - pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores id-base (0x%x)\n", - np, map_name, map_name, - map_mask, id_base); + pr_err("%pOF: Invalid %s translation - %s (0x%x) ignores id-base (0x%x)\n", + np, map_name, map_mask_name, map_mask, id_base); return -EFAULT; } - if (masked_id < id_base || masked_id >= id_base + id_len) - continue; - + phandle = be32_to_cpup(map + offset + 1); phandle_node = of_find_node_by_phandle(phandle); if (!phandle_node) return -ENODEV; + if (!bad_map && of_property_read_u32(phandle_node, cells_name, &cells)) { + pr_err("%pOF: missing %s property\n", phandle_node, cells_name); + of_node_put(phandle_node); + return -EINVAL; + } + + if (map_len - offset < 3 + cells) { + of_node_put(phandle_node); + goto err_map_len; + } + + if (offset == 0 && cells == 2) { + bad_map = of_check_bad_map(map, map_len); + if (bad_map) { + pr_warn_once("%pOF: %s mismatches target %s, assuming extra cell of 0\n", + np, map_name, cells_name); + cells = 1; + } + } + + out_base = map + offset + 2; + offset += 3 + cells; + + id_len = be32_to_cpup(map + offset - 1); + if (id_len > 1 && cells > 1) { + /* + * With 1 output cell we reasonably assume its value + * has a linear relationship to the input; with more, + * we'd need help from the provider to know what to do. + */ + pr_err("%pOF: Unsupported %s - cannot handle %d-ID range with %d-cell output specifier\n", + np, map_name, id_len, cells); + of_node_put(phandle_node); + return -EINVAL; + } + id_off = masked_id - id_base; + if (masked_id < id_base || id_off >= id_len) { + of_node_put(phandle_node); + continue; + } + if (arg->np) of_node_put(phandle_node); else @@ -2182,11 +2254,14 @@ int of_map_id(const struct device_node *np, u32 id, if (arg->np != phandle_node) continue; - arg->args[0] = masked_id - id_base + out_base; + for (int i = 0; i < cells; i++) + arg->args[i] = (id_off + be32_to_cpu(out_base[i])); + + arg->args_count = cells; pr_debug("%pOF: %s, using mask %08x, id-base: %08x, out-base: %08x, length: %08x, id: %08x -> %08x\n", - np, map_name, map_mask, id_base, out_base, - id_len, id, masked_id - id_base + out_base); + np, map_name, map_mask, id_base, be32_to_cpup(out_base), + id_len, id, id_off + be32_to_cpup(out_base)); return 0; } @@ -2196,6 +2271,10 @@ int of_map_id(const struct device_node *np, u32 id, /* Bypasses translation */ arg->args[0] = id; return 0; + +err_map_len: + pr_err("%pOF: Error: Bad %s length: %d\n", np, map_name, map_bytes); + return -EINVAL; } EXPORT_SYMBOL_GPL(of_map_id); @@ -2214,7 +2293,7 @@ EXPORT_SYMBOL_GPL(of_map_id); int of_map_iommu_id(const struct device_node *np, u32 id, struct of_phandle_args *arg) { - return of_map_id(np, id, "iommu-map", "iommu-map-mask", arg); + return of_map_id(np, id, "iommu-map", "#iommu-cells", "iommu-map-mask", arg); } EXPORT_SYMBOL_GPL(of_map_iommu_id); @@ -2233,6 +2312,6 @@ EXPORT_SYMBOL_GPL(of_map_iommu_id); int of_map_msi_id(const struct device_node *np, u32 id, struct of_phandle_args *arg) { - return of_map_id(np, id, "msi-map", "msi-map-mask", arg); + return of_map_id(np, id, "msi-map", "#msi-cells", "msi-map-mask", arg); } EXPORT_SYMBOL_GPL(of_map_msi_id); diff --git a/include/linux/of.h b/include/linux/of.h index f50d7a3a3b28..953f2dbe0e86 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -462,7 +462,8 @@ const char *of_prop_next_string(const struct property *prop, const char *cur); bool of_console_check(const struct device_node *dn, char *name, int index); int of_map_id(const struct device_node *np, u32 id, - const char *map_name, const char *map_mask_name, + const char *map_name, const char *cells_name, + const char *map_mask_name, struct of_phandle_args *arg); int of_map_iommu_id(const struct device_node *np, u32 id, @@ -934,7 +935,8 @@ static inline void of_property_clear_flag(struct property *p, unsigned long flag } static inline int of_map_id(const struct device_node *np, u32 id, - const char *map_name, const char *map_mask_name, + const char *map_name, const char *cells_name, + const char *map_mask_name, struct of_phandle_args *arg) { return -EINVAL; -- 2.34.1