It's somewhat hard to see, but arm64's arch_setup_dma_ops() should only
ever call iommu_setup_dma_ops() after a successful iommu_probe_device(),
which means there should be no harm in achieving the same order of
operations by running it off the back of iommu_probe_device() itself.
This then puts it in line with the x86 and s390 .probe_finalize bodges,
letting us pull it all into the main flow properly. As a bonus this lets
us fold in and de-scope the PCI workaround setup as well.
At this point we can also then pull the call up inside the group mutex,
and avoid having to think about whether iommu_group_store_type() could
theoretically race and free the domain if iommu_setup_dma_ops() ran just
*before* iommu_device_use_default_domain() claims it... Furthermore we
replace one .probe_finalize call completely, since the only remaining
implementations are now one which only needs to run once for the initial
boot-time probe, and two which themselves render that path unreachable.
This leaves us a big step closer to realistically being able to unpick
the variety of different things that iommu_setup_dma_ops() has been
muddling together, and further streamline iommu-dma into core API flows
in future.
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> # For Intel IOMMU
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/bebea331c1d688b34d9862eefd5ede47503961b8.1713523152.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
ARCH_DMA_MINALIGN, cls);
dev->dma_coherent = coherent;
- if (device_iommu_mapped(dev))
- iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
xen_setup_dma_ops(dev);
}
return iommu_dev;
}
-static void amd_iommu_probe_finalize(struct device *dev)
-{
- /* Domains are initialized for this device - have a look what we ended up with */
- set_dma_ops(dev, NULL);
- iommu_setup_dma_ops(dev, 0, U64_MAX);
-}
-
static void amd_iommu_release_device(struct device *dev)
{
struct amd_iommu *iommu;
.domain_alloc_user = amd_iommu_domain_alloc_user,
.probe_device = amd_iommu_probe_device,
.release_device = amd_iommu_release_device,
- .probe_finalize = amd_iommu_probe_finalize,
.device_group = amd_iommu_device_group,
.get_resv_regions = amd_iommu_get_resv_regions,
.is_attach_deferred = amd_iommu_is_attach_deferred,
.max_mapping_size = iommu_dma_max_mapping_size,
};
-/*
- * The IOMMU core code allocates the default DMA domain, which the underlying
- * IOMMU driver needs to support via the dma-iommu layer.
- */
-void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
+void iommu_setup_dma_ops(struct device *dev)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
- if (!domain)
- goto out_err;
+ if (dev_is_pci(dev))
+ dev->iommu->pci_32bit_workaround = !iommu_dma_forcedac;
- /*
- * The IOMMU core code allocates the default DMA domain, which the
- * underlying IOMMU driver needs to support via the dma-iommu layer.
- */
if (iommu_is_dma_domain(domain)) {
if (iommu_dma_init_domain(domain, dev))
goto out_err;
dev->dma_ops = &iommu_dma_ops;
+ } else if (dev->dma_ops == &iommu_dma_ops) {
+ /* Clean up if we've switched *from* a DMA domain */
+ dev->dma_ops = NULL;
}
return;
pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
dev_name(dev));
}
-EXPORT_SYMBOL_GPL(iommu_setup_dma_ops);
static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
phys_addr_t msi_addr, struct iommu_domain *domain)
#ifdef CONFIG_IOMMU_DMA
+void iommu_setup_dma_ops(struct device *dev);
+
int iommu_get_dma_cookie(struct iommu_domain *domain);
void iommu_put_dma_cookie(struct iommu_domain *domain);
void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
extern bool iommu_dma_forcedac;
-static inline void iommu_dma_set_pci_32bit_workaround(struct device *dev)
-{
- dev->iommu->pci_32bit_workaround = !iommu_dma_forcedac;
-}
#else /* CONFIG_IOMMU_DMA */
+static inline void iommu_setup_dma_ops(struct device *dev)
+{
+}
+
static inline int iommu_dma_init_fq(struct iommu_domain *domain)
{
return -EINVAL;
{
}
-static inline void iommu_dma_set_pci_32bit_workaround(struct device *dev)
-{
-}
-
#endif /* CONFIG_IOMMU_DMA */
#endif /* __DMA_IOMMU_H */
set_dma_ops(dev, NULL);
}
-static void intel_iommu_probe_finalize(struct device *dev)
-{
- set_dma_ops(dev, NULL);
- iommu_setup_dma_ops(dev, 0, U64_MAX);
-}
-
static void intel_iommu_get_resv_regions(struct device *device,
struct list_head *head)
{
.domain_alloc = intel_iommu_domain_alloc,
.domain_alloc_user = intel_iommu_domain_alloc_user,
.probe_device = intel_iommu_probe_device,
- .probe_finalize = intel_iommu_probe_finalize,
.release_device = intel_iommu_release_device,
.get_resv_regions = intel_iommu_get_resv_regions,
.device_group = intel_iommu_device_group,
if (list_empty(&group->entry))
list_add_tail(&group->entry, group_list);
}
- mutex_unlock(&group->mutex);
- if (dev_is_pci(dev))
- iommu_dma_set_pci_32bit_workaround(dev);
+ if (group->default_domain)
+ iommu_setup_dma_ops(dev);
+
+ mutex_unlock(&group->mutex);
return 0;
mutex_unlock(&group->mutex);
return ret;
}
+ for_each_group_device(group, gdev)
+ iommu_setup_dma_ops(gdev->dev);
mutex_unlock(&group->mutex);
/*
if (ret)
goto out_unlock;
- /*
- * Release the mutex here because ops->probe_finalize() call-back of
- * some vendor IOMMU drivers calls arm_iommu_attach_device() which
- * in-turn might call back into IOMMU core code, where it tries to take
- * group->mutex, resulting in a deadlock.
- */
- mutex_unlock(&group->mutex);
-
/* Make sure dma_ops is appropriatley set */
for_each_group_device(group, gdev)
- iommu_group_do_probe_finalize(gdev->dev);
- return count;
+ iommu_setup_dma_ops(gdev->dev);
out_unlock:
mutex_unlock(&group->mutex);
return size;
}
-static void s390_iommu_probe_finalize(struct device *dev)
-{
- iommu_setup_dma_ops(dev, 0, U64_MAX);
-}
-
struct zpci_iommu_ctrs *zpci_get_iommu_ctrs(struct zpci_dev *zdev)
{
if (!zdev || !zdev->s390_domain)
.capable = s390_iommu_capable,
.domain_alloc_paging = s390_domain_alloc_paging,
.probe_device = s390_iommu_probe_device,
- .probe_finalize = s390_iommu_probe_finalize,
.release_device = s390_iommu_release_device,
.device_group = generic_device_group,
.pgsize_bitmap = SZ_4K,
return ERR_PTR(ret);
}
-static void viommu_probe_finalize(struct device *dev)
-{
-#ifndef CONFIG_ARCH_HAS_SETUP_DMA_OPS
- /* First clear the DMA ops in case we're switching from a DMA domain */
- set_dma_ops(dev, NULL);
- iommu_setup_dma_ops(dev, 0, U64_MAX);
-#endif
-}
-
static void viommu_release_device(struct device *dev)
{
struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
.capable = viommu_capable,
.domain_alloc = viommu_domain_alloc,
.probe_device = viommu_probe_device,
- .probe_finalize = viommu_probe_finalize,
.release_device = viommu_release_device,
.device_group = viommu_device_group,
.get_resv_regions = viommu_get_resv_regions,
#ifdef CONFIG_IOMMU_DMA
#include <linux/msi.h>
-/* Setup call for arch DMA mapping code */
-void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
-
int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
struct msi_desc;
struct msi_msg;
-static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
-{
-}
-
static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
{
return -ENODEV;
projects / thirdparty / kernel / linux.git / commitdiff
