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| author | Robin Murphy <robin.murphy@arm.com> | 2017-10-13 21:23:39 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2017-11-06 20:27:06 +0300 |
| commit | 1c7e7c0278df968221a5edb1a293423e13b13814 (patch) | |
| tree | f17e2a6ec535867d06bd76321d76deb4159c4e9a /drivers/iommu/ipmmu-vmsa.c | |
| parent | 105a004e2187609a74f75d55fd0f9a054b49d60a (diff) | |
| download | linux-1c7e7c0278df968221a5edb1a293423e13b13814.tar.xz | |
iommu/ipmmu-vmsa: Unify domain alloc/free
We have two implementations for ipmmu_ops->alloc depending on
CONFIG_IOMMU_DMA, the difference being whether they accept the
IOMMU_DOMAIN_DMA type or not. However, iommu_dma_get_cookie() is
guaranteed to return an error when !CONFIG_IOMMU_DMA, so if
ipmmu_domain_alloc_dma() was actually checking and handling the return
value correctly, it would behave the same as ipmmu_domain_alloc()
anyway.
Similarly for freeing; iommu_put_dma_cookie() is robust by design.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/iommu/ipmmu-vmsa.c')
| -rw-r--r-- | drivers/iommu/ipmmu-vmsa.c | 65 |
1 files changed, 24 insertions, 41 deletions
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index 00e88a88ee3a..37154075c00a 100644 --- a/drivers/iommu/ipmmu-vmsa.c +++ b/drivers/iommu/ipmmu-vmsa.c @@ -528,6 +528,27 @@ static struct iommu_domain *__ipmmu_domain_alloc(unsigned type) return &domain->io_domain; } +static struct iommu_domain *ipmmu_domain_alloc(unsigned type) +{ + struct iommu_domain *io_domain = NULL; + + switch (type) { + case IOMMU_DOMAIN_UNMANAGED: + io_domain = __ipmmu_domain_alloc(type); + break; + + case IOMMU_DOMAIN_DMA: + io_domain = __ipmmu_domain_alloc(type); + if (io_domain && iommu_get_dma_cookie(io_domain)) { + kfree(io_domain); + io_domain = NULL; + } + break; + } + + return io_domain; +} + static void ipmmu_domain_free(struct iommu_domain *io_domain) { struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); @@ -536,6 +557,7 @@ static void ipmmu_domain_free(struct iommu_domain *io_domain) * Free the domain resources. We assume that all devices have already * been detached. */ + iommu_put_dma_cookie(io_domain); ipmmu_domain_destroy_context(domain); free_io_pgtable_ops(domain->iop); kfree(domain); @@ -671,14 +693,6 @@ static int ipmmu_of_xlate(struct device *dev, #if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA) -static struct iommu_domain *ipmmu_domain_alloc(unsigned type) -{ - if (type != IOMMU_DOMAIN_UNMANAGED) - return NULL; - - return __ipmmu_domain_alloc(type); -} - static int ipmmu_add_device(struct device *dev) { struct ipmmu_vmsa_device *mmu = NULL; @@ -779,37 +793,6 @@ static const struct iommu_ops ipmmu_ops = { static DEFINE_SPINLOCK(ipmmu_slave_devices_lock); static LIST_HEAD(ipmmu_slave_devices); -static struct iommu_domain *ipmmu_domain_alloc_dma(unsigned type) -{ - struct iommu_domain *io_domain = NULL; - - switch (type) { - case IOMMU_DOMAIN_UNMANAGED: - io_domain = __ipmmu_domain_alloc(type); - break; - - case IOMMU_DOMAIN_DMA: - io_domain = __ipmmu_domain_alloc(type); - if (io_domain) - iommu_get_dma_cookie(io_domain); - break; - } - - return io_domain; -} - -static void ipmmu_domain_free_dma(struct iommu_domain *io_domain) -{ - switch (io_domain->type) { - case IOMMU_DOMAIN_DMA: - iommu_put_dma_cookie(io_domain); - /* fall-through */ - default: - ipmmu_domain_free(io_domain); - break; - } -} - static int ipmmu_add_device_dma(struct device *dev) { struct iommu_group *group; @@ -878,8 +861,8 @@ static struct iommu_group *ipmmu_find_group_dma(struct device *dev) } static const struct iommu_ops ipmmu_ops = { - .domain_alloc = ipmmu_domain_alloc_dma, - .domain_free = ipmmu_domain_free_dma, + .domain_alloc = ipmmu_domain_alloc, + .domain_free = ipmmu_domain_free, .attach_dev = ipmmu_attach_device, .detach_dev = ipmmu_detach_device, .map = ipmmu_map, |