From: Hiroshi Doyu <hdoyu@nvidia.com>
To: Stephen Warren <swarren@wwwdotorg.org>, <swarren@nvidia.com>,
<will.deacon@arm.com>, <grant.likely@linaro.org>,
<thierry.reding@gmail.com>, <robherring2@gmail.com>,
<joro@8bytes.org>
Cc: Hiroshi Doyu <hdoyu@nvidia.com>, <mark.rutland@arm.com>,
<devicetree@vger.kernel.org>, <lorenzo.pieralisi@arm.com>,
<linux-kernel@vger.kernel.org>,
<iommu@lists.linux-foundation.org>, <galak@codeaurora.org>,
<linux-tegra@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Subject: [PATCHv7 02/12] iommu/of: introduce a global iommu device list
Date: Thu, 12 Dec 2013 09:57:03 +0200 [thread overview]
Message-ID: <1386835033-4701-3-git-send-email-hdoyu@nvidia.com> (raw)
In-Reply-To: <1386835033-4701-1-git-send-email-hdoyu@nvidia.com>
This enables to find an populated IOMMU device via a device node. This
can be used to see if an dependee IOMMU is populated or not to keep
correct device population order. Client devices need to wait an IOMMU
to be populated.
Suggested by Thierry Reding and copied his example code.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
---
v6:
New for v6.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
---
drivers/iommu/of_iommu.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/of_iommu.h | 16 ++++++++++++++++
2 files changed, 53 insertions(+)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index ee249bc..5d1aeb9 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -20,6 +20,43 @@
#include <linux/export.h>
#include <linux/limits.h>
#include <linux/of.h>
+#include <linux/of_iommu.h>
+#include <linux/device.h>
+
+static DEFINE_MUTEX(iommus_lock);
+static LIST_HEAD(iommus_list);
+
+void iommu_add(struct iommu *iommu)
+{
+ INIT_LIST_HEAD(&iommu->list);
+ mutex_lock(&iommus_lock);
+ list_add_tail(&iommu->list, &iommus_list);
+ mutex_unlock(&iommus_lock);
+}
+
+void iommu_del(struct iommu *iommu)
+{
+ INIT_LIST_HEAD(&iommu->list);
+ mutex_lock(&iommus_lock);
+ list_del(&iommu->list);
+ mutex_unlock(&iommus_lock);
+}
+
+static struct iommu *of_find_iommu_by_node(struct device_node *np)
+{
+ struct iommu *iommu;
+
+ mutex_lock(&iommus_lock);
+ list_for_each_entry(iommu, &iommus_list, list) {
+ if (iommu->dev->of_node == np) {
+ mutex_unlock(&iommus_lock);
+ return iommu;
+ }
+ }
+ mutex_unlock(&iommus_lock);
+
+ return NULL;
+}
/**
* of_get_dma_window - Parse *dma-window property and returns 0 if found.
diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
index 51a560f..a0aa9d4 100644
--- a/include/linux/of_iommu.h
+++ b/include/linux/of_iommu.h
@@ -3,10 +3,18 @@
#ifdef CONFIG_OF_IOMMU
+struct iommu {
+ struct list_head list;
+ struct device *dev;
+};
+
extern int of_get_dma_window(struct device_node *dn, const char *prefix,
int index, unsigned long *busno, dma_addr_t *addr,
size_t *size);
+extern void iommu_add(struct iommu *iommu);
+extern void iommu_del(struct iommu *iommu);
+
#else
static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
@@ -16,6 +24,14 @@ static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
return -EINVAL;
}
+static inline void iommu_add(struct iommu *iommu)
+{
+}
+
+static inline void iommu_del(struct iommu *iommu)
+{
+}
+
#endif /* CONFIG_OF_IOMMU */
#endif /* __OF_IOMMU_H */
--
1.8.1.5
next prev parent reply other threads:[~2013-12-12 7:58 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-12 7:57 [PATCHv7 00/12] Unifying SMMU driver among Tegra SoCs Hiroshi Doyu
2013-12-12 7:57 ` [PATCHv7 01/12] of: introduce of_property_for_each_phandle_with_args() Hiroshi Doyu
2013-12-16 18:29 ` Stephen Warren
2013-12-12 7:57 ` Hiroshi Doyu [this message]
2013-12-16 18:32 ` [PATCHv7 02/12] iommu/of: introduce a global iommu device list Stephen Warren
2013-12-12 7:57 ` [PATCHv7 03/12] iommu/of: check if dependee iommu is ready or not Hiroshi Doyu
2013-12-16 18:34 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 04/12] driver/core: populate devices in order for IOMMUs Hiroshi Doyu
2013-12-12 11:39 ` Grant Likely
2013-12-13 2:14 ` Greg KH
2013-12-14 12:24 ` Thierry Reding
2013-12-14 14:28 ` Hiroshi Doyu
2013-12-16 18:26 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 05/12] iommu/core: add ops->{bound,unbind}_driver() Hiroshi Doyu
2013-12-16 18:42 ` Stephen Warren
2013-12-30 13:45 ` Joerg Roedel
2013-12-12 7:57 ` [PATCHv7 06/12] ARM: tegra: create a DT header defining SWGROUP ID Hiroshi Doyu
2013-12-18 8:02 ` Mark Zhang
2013-12-18 16:27 ` Stephen Warren
2013-12-20 12:35 ` Thierry Reding
2013-12-20 17:36 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 07/12] iommu/tegra: smmu: register device to iommu dynamically Hiroshi Doyu
2013-12-16 18:46 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 08/12] iommu/tegra: smmu: calculate ASID register offset by ID Hiroshi Doyu
2013-12-16 19:02 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 09/12] iommu/tegra: smmu: get swgroups from DT "iommus=" Hiroshi Doyu
2013-12-16 19:09 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 10/12] iommu/tegra: smmu: allow duplicate ASID wirte Hiroshi Doyu
2013-12-16 19:19 ` Stephen Warren
2013-12-12 7:57 ` [PATCHv7 11/12] iommu/tegra: smmu: Rename hwgrp -> swgroups Hiroshi Doyu
2013-12-12 7:57 ` [PATCHv7 12/12] iommu/tegra: smmu: add SMMU to an global iommu list Hiroshi Doyu
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