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Tue, 06 Jan 2026 21:33:16 -0800 (PST) X-Google-Smtp-Source: AGHT+IGsU6Tll0jH+4cPRN75Crua0J0WmF4N1GJ8rbvbzF/Esty0h551IC4VDJ/8fjpEFvJJVbAYFA== X-Received: by 2002:a05:6a00:340a:b0:7ff:a5d2:7c9e with SMTP id d2e1a72fcca58-81b7de5c1f0mr1403666b3a.21.1767763995641; Tue, 06 Jan 2026 21:33:15 -0800 (PST) Received: from [10.219.57.109] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-819c5de66d1sm3684127b3a.62.2026.01.06.21.33.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Jan 2026 21:33:15 -0800 (PST) Message-ID: Date: Wed, 7 Jan 2026 11:01:11 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/3] of: Respect #{iommu,msi}-cells in maps To: robin.murphy@arm.com, will@kernel.org, joro@8bytes.org, robh@kernel.org, dmitry.baryshkov@oss.qualcomm.com, konrad.dybcio@oss.qualcomm.com, bjorn.andersson@oss.qualcomm.com, bod@kernel.org, conor+dt@kernel.org, krzk+dt@kernel.org, saravanak@google.com, prakash.gupta@oss.qualcomm.com, vikash.garodia@oss.qualcomm.com Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20251231114257.2382820-1-vijayanand.jitta@oss.qualcomm.com> <20251231114257.2382820-4-vijayanand.jitta@oss.qualcomm.com> Content-Language: en-US From: Vijayanand Jitta In-Reply-To: <20251231114257.2382820-4-vijayanand.jitta@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA3MDA0MiBTYWx0ZWRfX0Jpd1NLED091 gwiWNlOkgwSTWU+vFpYnE/ZexlCuU/t5d9FXeb8Sx2l2WB6opA3zoI7frv0KcrGfUnZtqV4i2jr Sm/CBXIMbEfZNOfw/u7MaoYXkZm5W2ouhwK+baTUPmEawhYLmE9EQjoMAZfchOTmIUgySogAeRA YVBGkkyXRt5aJweUmZJVbGnykvuKVZ8618FZamftVZ9V8dQo8KyY8O6N233qUkNvRTdBJAZYPSj OXt8sZC8gEfv7hSuVC9BiGK1iyf1IVDVw4Wb6dY/WWknxLD2i+SdCb0QyRbmeqh4fDhIvvMhQGn azIp3vNnGHHJXoK3hn+H1t8fuSMgzV/NymgLR76E1C6USJJBjhQ7YpK2gIvTTvGuBcL+B1lDEH3 p0OS+VuCKwVThTM+o3tQZ17lInVcShxUSWpXSGHtWExJrhMO1KRn+KRLiGSLsIIzV2r6kvJP/az RhiDidIlr6cpiAi3zPQ== X-Proofpoint-ORIG-GUID: pmbf_kQDZbH28qNuPYOoOfF5y7dcupK6 X-Authority-Analysis: v=2.4 cv=comWUl4i c=1 sm=1 tr=0 ts=695df01d cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=3f3g1KydcdST7NtTSaIA:9 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-GUID: pmbf_kQDZbH28qNuPYOoOfF5y7dcupK6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-06_03,2026-01-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 phishscore=0 malwarescore=0 bulkscore=0 clxscore=1015 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601070042 On 12/31/2025 5:12 PM, Vijayanand Jitta wrote: > From: Robin Murphy > > So far our parsing of {iommu,msi}-map properites has always blindly > asusmed 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: Vijayanand Jitta > --- > drivers/iommu/of_iommu.c | 4 +- > drivers/of/base.c | 114 +++++++++++++++++++++++++++++++-------- > include/linux/of.h | 16 +++--- > 3 files changed, 101 insertions(+), 33 deletions(-) > > diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c > index 646ac5a67475..768eaddf927b 100644 > --- a/drivers/iommu/of_iommu.c > +++ b/drivers/iommu/of_iommu.c > @@ -46,9 +46,7 @@ static int of_iommu_configure_dev_id(struct device_node *master_np, > const u32 *id) > { > struct of_map_id_arg arg = { > - .map_args = { > - .args_count = 1, > - }, > + .map_args = {}, > }; > int err; > > diff --git a/drivers/of/base.c b/drivers/of/base.c > index 9f327c6b4f6b..f0507ddb6dae 100644 > --- a/drivers/of/base.c > +++ b/drivers/of/base.c > @@ -2045,11 +2045,38 @@ 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: contains the optional params, wrapped in a struct of_phandle_args, > * which includes: > @@ -2067,18 +2094,19 @@ 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, > - struct of_map_id_arg *arg) > +int of_map_id(const struct device_node *np, u32 id, const char *map_name, > + const char *cells_name, const char *map_mask_name, > + struct of_map_id_arg *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->map_args.np) > return -ENODEV; > @@ -2087,11 +2115,9 @@ 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; > @@ -2104,27 +2130,64 @@ 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, > + 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); > + return -EINVAL; > + } > + > + if (map_len - offset < 3 + cells) > + 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); > + return -EINVAL; > + } > + id_off = masked_id - id_base; > + if (masked_id < id_base || id_off >= id_len) > + continue; > + > if (arg->map_args.np) > of_node_put(phandle_node); > else > @@ -2133,11 +2196,14 @@ int of_map_id(const struct device_node *np, u32 id, > if (arg->map_args.np != phandle_node) > continue; > > - arg->map_args.args[0] = masked_id - id_base + out_base; > + for (int i = 0; i < cells; i++) > + arg->map_args.args[i] = (id_off + be32_to_cpu(out_base[i])); > + > + arg->map_args.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; > } > > @@ -2147,5 +2213,9 @@ int of_map_id(const struct device_node *np, u32 id, > /* Bypasses translation */ > arg->map_args.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); > diff --git a/include/linux/of.h b/include/linux/of.h > index 0b0d545b80a3..ee07e8642133 100644 > --- a/include/linux/of.h > +++ b/include/linux/of.h > @@ -460,9 +460,9 @@ 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, > - struct of_map_id_arg *arg); > +int of_map_id(const struct device_node *np, u32 id, const char *map_name, > + const char *cells_name, const char *map_mask_name, > + struct of_map_id_arg *arg); > > phys_addr_t of_dma_get_max_cpu_address(struct device_node *np); > > @@ -909,9 +909,9 @@ 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, > - struct of_map_id_arg *arg) > +static inline int of_map_id(const struct device_node *np, u32 id, const char *map_name, > + const char *cells_name, const char *map_mask_name, > + struct of_map_id_arg *arg); > { > return -EINVAL; > } > @@ -1442,7 +1442,7 @@ static inline int of_property_read_s32(const struct device_node *np, > static inline int of_map_iommu_id(const struct device_node *np, u32 id, > struct of_map_id_arg *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); > } > > static inline int of_map_msi_id(const struct device_node *np, u32 id, > @@ -1456,7 +1456,7 @@ static inline int of_map_msi_id(const struct device_node *np, u32 id, > }, > }; > > - 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); > } > > #define of_for_each_phandle(it, err, np, ln, cn, cc) \ Rob, Gentle ping, could you please let me know if the latest patchset looks good enough to be considered for the next merge window? Thanks, Vijay