[RFC 3/7] iommu: improve iommu iotlb flushing

Tom Murphy
2019-05-04T13:23:19Z

Add a new iommu_ops::flush_iotlb_range function which allows us to flush
the entire range of an iommu_unmap and implement it for the amd and
intel iommu drivers.
remove the iotlb_range_add because it isn't used anywhere.

Signed-off-by: Tom Murphy <tmurphy@arista.com>
---
drivers/iommu/amd_iommu.c | 14 +++++----
drivers/iommu/arm-smmu-v3.c | 3 +-
drivers/iommu/arm-smmu.c | 2 +-
drivers/iommu/exynos-iommu.c | 3 +-
drivers/iommu/intel-iommu.c | 50 ++++++++++++++++++++-------------
drivers/iommu/iommu.c | 11 +++++---
drivers/iommu/ipmmu-vmsa.c | 2 +-
drivers/iommu/msm_iommu.c | 2 +-
drivers/iommu/mtk_iommu.c | 3 +-
drivers/iommu/mtk_iommu_v1.c | 3 +-
drivers/iommu/omap-iommu.c | 2 +-
drivers/iommu/qcom_iommu.c | 2 +-
drivers/iommu/rockchip-iommu.c | 2 +-
drivers/iommu/s390-iommu.c | 3 +-
drivers/iommu/tegra-gart.c | 2 +-
drivers/iommu/tegra-smmu.c | 2 +-
drivers/vfio/vfio_iommu_type1.c | 1 -
include/linux/iommu.h | 21 ++++++++------
18 files changed, 77 insertions(+), 51 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f7cdd2ab7f11..de98265b5f4e 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3105,7 +3105,7 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
}

static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
- size_t page_size)
+ size_t page_size, struct page **freelist)
{
struct protection_domain *domain = to_pdomain(dom);
size_t unmap_size;
@@ -3246,9 +3246,14 @@ static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain)
domain_flush_complete(dom);
}

-static void amd_iommu_iotlb_range_add(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static void amd_iommu_flush_iotlb_range(struct iommu_domain *domain,
+ unsigned long iova, size_t size,
+ struct page *freelist)
{
+ struct protection_domain *dom = to_pdomain(domain);
+
+ domain_flush_pages(dom, iova, size);
+ domain_flush_complete(dom);
}

const struct iommu_ops amd_iommu_ops = {
@@ -3269,8 +3274,7 @@ const struct iommu_ops amd_iommu_ops = {
.is_attach_deferred = amd_iommu_is_attach_deferred,
.pgsize_bitmap = AMD_IOMMU_PGSIZES,
.flush_iotlb_all = amd_iommu_flush_iotlb_all,
- .iotlb_range_add = amd_iommu_iotlb_range_add,
- .iotlb_sync = amd_iommu_flush_iotlb_all,
+ .flush_iotlb_range = amd_iommu_flush_iotlb_range,
};

/*****************************************************************************
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index d3880010c6cf..2d24185614b9 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1788,7 +1788,8 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t
-arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
+arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size,
+ struct page **freelist)
{
struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 045d93884164..80bcd4d3197a 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1303,7 +1303,7 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+ size_t size, struct page **freelist)
{
struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 05c6bc099d62..5f858ca8a970 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1133,7 +1133,8 @@ static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain
}

static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain,
- unsigned long l_iova, size_t size)
+ unsigned long l_iova, size_t size,
+ struct page **freelist)
{
struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
sysmmu_iova_t iova = (sysmmu_iova_t)l_iova;
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 77895cd89f29..87622a28b854 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1146,17 +1146,17 @@ static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level,
pages can only be freed after the IOTLB flush has been done. */
static struct page *domain_unmap(struct dmar_domain *domain,
unsigned long start_pfn,
- unsigned long last_pfn)
+ unsigned long last_pfn,
+ struct page *freelist)
{
- struct page *freelist;
-
BUG_ON(!domain_pfn_supported(domain, start_pfn));
BUG_ON(!domain_pfn_supported(domain, last_pfn));
BUG_ON(start_pfn > last_pfn);

/* we don't need lock here; nobody else touches the iova range */
freelist = dma_pte_clear_level(domain, agaw_to_level(domain->agaw),
- domain->pgd, 0, start_pfn, last_pfn, NULL);
+ domain->pgd, 0, start_pfn, last_pfn,
+ freelist);

/* free pgd */
if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {
@@ -1873,7 +1873,7 @@ static void domain_exit(struct dmar_domain *domain)
if (domain->domain.type == IOMMU_DOMAIN_DMA)
put_iova_domain(&domain->iovad);

- freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
+ freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw), NULL);

dma_free_pagelist(freelist);

@@ -3340,7 +3340,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)

dev_dbg(dev, "Device unmapping: pfn %lx-%lx\n", start_pfn, last_pfn);

- freelist = domain_unmap(domain, start_pfn, last_pfn);
+ freelist = domain_unmap(domain, start_pfn, last_pfn, NULL);

if (intel_iommu_strict) {
iommu_flush_iotlb_psi(iommu, domain, start_pfn,
@@ -4190,7 +4190,7 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb,
struct page *freelist;

freelist = domain_unmap(si_domain, start_vpfn,
- last_vpfn);
+ last_vpfn, NULL);

rcu_read_lock();
for_each_active_iommu(iommu, drhd)
@@ -4780,13 +4780,12 @@ static int intel_iommu_map(struct iommu_domain *domain,
}

static size_t intel_iommu_unmap(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+ unsigned long iova, size_t size,
+ struct page **freelist)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
- struct page *freelist = NULL;
unsigned long start_pfn, last_pfn;
- unsigned int npages;
- int iommu_id, level = 0;
+ int level = 0;

/* Cope with horrid API which requires us to unmap more than the
size argument if it happens to be a large-page mapping. */
@@ -4798,20 +4797,32 @@ static size_t intel_iommu_unmap(struct iommu_domain *domain,
start_pfn = iova >> VTD_PAGE_SHIFT;
last_pfn = (iova + size - 1) >> VTD_PAGE_SHIFT;

- freelist = domain_unmap(dmar_domain, start_pfn, last_pfn);
+ *freelist = domain_unmap(dmar_domain, start_pfn, last_pfn, *freelist);
+ if (dmar_domain->max_addr == iova + size)
+ dmar_domain->max_addr = iova;
+
+ return size;
+}
+
+static void intel_iommu_flush_iotlb_range(struct iommu_domain *domain,
+ unsigned long iova, size_t size,
+ struct page *freelist)
+{
+ struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+ unsigned long start_pfn, last_pfn;
+ unsigned long iova_pfn = IOVA_PFN(iova);
+ unsigned long nrpages;
+ int iommu_id;

- npages = last_pfn - start_pfn + 1;
+ nrpages = aligned_nrpages(iova, size);
+ start_pfn = mm_to_dma_pfn(iova_pfn);
+ last_pfn = start_pfn + nrpages - 1;

for_each_domain_iommu(iommu_id, dmar_domain)
iommu_flush_iotlb_psi(g_iommus[iommu_id], dmar_domain,
- start_pfn, npages, !freelist, 0);
+ start_pfn, nrpages, !freelist, 0);

dma_free_pagelist(freelist);
-
- if (dmar_domain->max_addr == iova + size)
- dmar_domain->max_addr = iova;
-
- return size;
}

static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
@@ -5039,6 +5050,7 @@ const struct iommu_ops intel_iommu_ops = {
.detach_dev = intel_iommu_detach_device,
.map = intel_iommu_map,
.unmap = intel_iommu_unmap,
+ .flush_iotlb_range = intel_iommu_flush_iotlb_range,
.iova_to_phys = intel_iommu_iova_to_phys,
.add_device = intel_iommu_add_device,
.remove_device = intel_iommu_remove_device,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 6353e13ae79f..23918e7a0094 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1658,6 +1658,7 @@ static size_t __iommu_unmap(struct iommu_domain *domain,
{
const struct iommu_ops *ops = domain->ops;
size_t unmapped_page, unmapped = 0;
+ struct page *freelist_head = NULL;
unsigned long orig_iova = iova;
unsigned int min_pagesz;

@@ -1691,13 +1692,11 @@ static size_t __iommu_unmap(struct iommu_domain *domain,
while (unmapped < size) {
size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);

- unmapped_page = ops->unmap(domain, iova, pgsize);
+ unmapped_page = ops->unmap(domain, iova, pgsize,
+ &freelist_head);
if (!unmapped_page)
break;

- if (sync && ops->iotlb_range_add)
- ops->iotlb_range_add(domain, iova, pgsize);
-
pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
iova, unmapped_page);

@@ -1708,6 +1707,10 @@ static size_t __iommu_unmap(struct iommu_domain *domain,
if (sync && ops->iotlb_sync)
ops->iotlb_sync(domain);

+ if (sync && ops->flush_iotlb_range)
+ ops->flush_iotlb_range(domain, orig_iova, unmapped,
+ freelist_head);
+
trace_unmap(orig_iova, size, unmapped);
return unmapped;
}
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 9a380c10655e..7c30d82a2f99 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -718,7 +718,7 @@ static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova,
}

static size_t ipmmu_unmap(struct iommu_domain *io_domain, unsigned long iova,
- size_t size)
+ size_t size, struct page **freelist)
{
struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);

diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 9fb0eb7a4d02..d5067af98602 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -522,7 +522,7 @@ static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t len)
+ size_t len, struct page **freelist)
{
struct msm_priv *priv = to_msm_priv(domain);
unsigned long flags;
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index de3e02277b70..18a08e77b24f 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -379,7 +379,8 @@ static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t mtk_iommu_unmap(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+ unsigned long iova, size_t size,
+ struct page **freelist)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
unsigned long flags;
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 52b01e3a49df..79d7e35e06ee 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -332,7 +332,8 @@ static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t mtk_iommu_unmap(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+ unsigned long iova, size_t size,
+ struct page **freelist)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
unsigned long flags;
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index d2fb347aa4ff..680a2ea76c60 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1153,7 +1153,7 @@ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
}

static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
- size_t size)
+ size_t size, struct page **freelist)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct device *dev = omap_domain->dev;
diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index 8cdd3f059513..0a4bcd604bdc 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -428,7 +428,7 @@ static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t qcom_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+ size_t size, struct page **freelist)
{
size_t ret;
unsigned long flags;
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 77d4bd93fe4b..7fce623a0ff6 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -797,7 +797,7 @@ static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
}

static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
- size_t size)
+ size_t size, struct page **freelist)
{
struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
unsigned long flags;
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 22d4db302c1c..b58755219a1f 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -314,7 +314,8 @@ static phys_addr_t s390_iommu_iova_to_phys(struct iommu_domain *domain,
}

static size_t s390_iommu_unmap(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+ unsigned long iova, size_t size,
+ struct page **freelist)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
int flags = ZPCI_PTE_INVALID;
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 4d8057916552..823e5fe31c34 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -219,7 +219,7 @@ static inline int __gart_iommu_unmap(struct gart_device *gart,
}

static size_t gart_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t bytes)
+ size_t bytes, struct page **freelist)
{
struct gart_device *gart = gart_handle;
int err;
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 5182c7d6171e..612073a445b7 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -662,7 +662,7 @@ static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova,
}

static size_t tegra_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+ size_t size, struct page **freelist)
{
struct tegra_smmu_as *as = to_smmu_as(domain);
dma_addr_t pte_dma;
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index d0f731c9920a..26c3f519b01a 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -715,7 +715,6 @@ static size_t unmap_unpin_fast(struct vfio_domain *domain,
if (!unmapped) {
kfree(entry);
} else {
- iommu_tlb_range_add(domain->domain, *iova, unmapped);
entry->iova = *iova;
entry->phys = phys;
entry->len = unmapped;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 9318fa1d822e..7e084eb1725f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -172,7 +172,7 @@ struct iommu_resv_region {
* @map: map a physically contiguous memory region to an iommu domain
* @unmap: unmap a physically contiguous memory region from an iommu domain
* @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
- * @iotlb_range_add: Add a given iova range to the flush queue for this domain
+ * @flush_iotlb_range: Flush given iova range of hardware TLBs for this domain
* @iotlb_sync_map: Sync mappings created recently using @map to the hardware
* @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
* queue
@@ -209,10 +209,11 @@ struct iommu_ops {
int (*map)(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot);
size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
- size_t size);
+ size_t size, struct page **freelist);
void (*flush_iotlb_all)(struct iommu_domain *domain);
- void (*iotlb_range_add)(struct iommu_domain *domain,
- unsigned long iova, size_t size);
+ void (*flush_iotlb_range)(struct iommu_domain *domain,
+ unsigned long iova, size_t size,
+ struct page *freelist);
void (*iotlb_sync_map)(struct iommu_domain *domain);
void (*iotlb_sync)(struct iommu_domain *domain);
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
@@ -371,11 +372,12 @@ static inline void iommu_flush_tlb_all(struct iommu_domain *domain)
domain->ops->flush_iotlb_all(domain);
}

-static inline void iommu_tlb_range_add(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static inline void iommu_flush_iotlb_range(struct iommu_domain *domain,
+ unsigned long iova, size_t size,
+ struct page *freelist)
{
- if (domain->ops->iotlb_range_add)
- domain->ops->iotlb_range_add(domain, iova, size);
+ if (domain->ops->flush_iotlb_range)
+ domain->ops->flush_iotlb_range(domain, iova, size, freelist);
}

static inline void iommu_tlb_sync(struct iommu_domain *domain)
@@ -487,7 +489,8 @@ static inline size_t iommu_unmap(struct iommu_domain *domain,
}

static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
- unsigned long iova, int gfp_order)
+ unsigned long iova, int gfp_order,
+ struct page **freelist)
{
return 0;
}
--
2.17.1