From: Wang Xingang <wangxingang5@huawei.com> To: <will@kernel.org>, <joro@8bytes.org>, <robh+dt@kernel.org>, <frowand.list@gmail.com> Cc: <helgaas@kernel.org>, <gregkh@linuxfoundation.org>, <iommu@lists.linux-foundation.org>, <linux-kernel@vger.kernel.org>, <linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>, <xieyingtai@huawei.com>, <wangxingang5@huawei.com> Subject: [PATCH v2] iommu/of: Fix pci_request_acs() before enumerating PCI devices Date: Mon, 17 May 2021 13:17:05 +0000 [thread overview] Message-ID: <1621257425-37856-1-git-send-email-wangxingang5@huawei.com> (raw) From: Xingang Wang <wangxingang5@huawei.com> When booting with devicetree, the pci_request_acs() is called after the enumeration and initialization of PCI devices, thus the ACS is not enabled. This patch add check for IOMMU in of_core_init(), and call pci_request_acs() when iommu is detected, making sure that the ACS will be enabled. Fixes: 6bf6c24720d33 ("iommu/of: Request ACS from the PCI core when configuring IOMMU linkage") Signed-off-by: Xingang Wang <wangxingang5@huawei.com> --- drivers/iommu/of_iommu.c | 1 - drivers/of/base.c | 9 ++++++++- 2 files changed, 8 insertions(+), 2 deletions(-) Change log: v1->v2: - remove pci_request_acs() in of_iommu_configure - check and call pci_request_acs() in of_core_init() diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index a9d2df001149..54a14da242cc 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -205,7 +205,6 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, .np = master_np, }; - pci_request_acs(); err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); } else { diff --git a/drivers/of/base.c b/drivers/of/base.c index 48e941f99558..95cd8f0e5435 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -24,6 +24,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_graph.h> +#include <linux/pci.h> #include <linux/spinlock.h> #include <linux/slab.h> #include <linux/string.h> @@ -166,7 +167,7 @@ void __of_phandle_cache_inv_entry(phandle handle) void __init of_core_init(void) { struct device_node *np; - + bool of_iommu_detect = false; /* Create the kset, and register existing nodes */ mutex_lock(&of_mutex); @@ -180,6 +181,12 @@ void __init of_core_init(void) __of_attach_node_sysfs(np); if (np->phandle && !phandle_cache[of_phandle_cache_hash(np->phandle)]) phandle_cache[of_phandle_cache_hash(np->phandle)] = np; + + /* Detect IOMMU and make sure ACS will be enabled */ + if (!of_iommu_detect && of_get_property(np, "iommu-map", NULL)) { + of_iommu_detect = true; + pci_request_acs(); + } } mutex_unlock(&of_mutex); -- 2.19.1
WARNING: multiple messages have this Message-ID (diff)
From: Wang Xingang <wangxingang5@huawei.com> To: <will@kernel.org>, <joro@8bytes.org>, <robh+dt@kernel.org>, <frowand.list@gmail.com> Cc: xieyingtai@huawei.com, devicetree@vger.kernel.org, wangxingang5@huawei.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, helgaas@kernel.org, linux-pci@vger.kernel.org Subject: [PATCH v2] iommu/of: Fix pci_request_acs() before enumerating PCI devices Date: Mon, 17 May 2021 13:17:05 +0000 [thread overview] Message-ID: <1621257425-37856-1-git-send-email-wangxingang5@huawei.com> (raw) From: Xingang Wang <wangxingang5@huawei.com> When booting with devicetree, the pci_request_acs() is called after the enumeration and initialization of PCI devices, thus the ACS is not enabled. This patch add check for IOMMU in of_core_init(), and call pci_request_acs() when iommu is detected, making sure that the ACS will be enabled. Fixes: 6bf6c24720d33 ("iommu/of: Request ACS from the PCI core when configuring IOMMU linkage") Signed-off-by: Xingang Wang <wangxingang5@huawei.com> --- drivers/iommu/of_iommu.c | 1 - drivers/of/base.c | 9 ++++++++- 2 files changed, 8 insertions(+), 2 deletions(-) Change log: v1->v2: - remove pci_request_acs() in of_iommu_configure - check and call pci_request_acs() in of_core_init() diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index a9d2df001149..54a14da242cc 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -205,7 +205,6 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, .np = master_np, }; - pci_request_acs(); err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); } else { diff --git a/drivers/of/base.c b/drivers/of/base.c index 48e941f99558..95cd8f0e5435 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -24,6 +24,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_graph.h> +#include <linux/pci.h> #include <linux/spinlock.h> #include <linux/slab.h> #include <linux/string.h> @@ -166,7 +167,7 @@ void __of_phandle_cache_inv_entry(phandle handle) void __init of_core_init(void) { struct device_node *np; - + bool of_iommu_detect = false; /* Create the kset, and register existing nodes */ mutex_lock(&of_mutex); @@ -180,6 +181,12 @@ void __init of_core_init(void) __of_attach_node_sysfs(np); if (np->phandle && !phandle_cache[of_phandle_cache_hash(np->phandle)]) phandle_cache[of_phandle_cache_hash(np->phandle)] = np; + + /* Detect IOMMU and make sure ACS will be enabled */ + if (!of_iommu_detect && of_get_property(np, "iommu-map", NULL)) { + of_iommu_detect = true; + pci_request_acs(); + } } mutex_unlock(&of_mutex); -- 2.19.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next reply other threads:[~2021-05-17 13:17 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-17 13:17 Wang Xingang [this message] 2021-05-17 13:17 ` [PATCH v2] iommu/of: Fix pci_request_acs() before enumerating PCI devices Wang Xingang 2021-05-19 19:14 ` Rob Herring 2021-05-19 19:14 ` Rob Herring 2021-05-20 3:29 ` Xingang Wang 2021-05-20 3:29 ` Xingang Wang
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