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Message-Id: <1610376862-927-3-git-send-email-isaacm@codeaurora.org>
Date: Mon, 11 Jan 2021 06:54:19 -0800
From: "Isaac J. Manjarres" <isaacm@...eaurora.org>
To: will@...nel.org, robin.murphy@....com, joro@...tes.org
Cc: "Isaac J. Manjarres" <isaacm@...eaurora.org>, pdaly@...eaurora.org,
pratikp@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/5] iommu/io-pgtable-arm: Hook up map_sg()
Implement the map_sg io-pgtable op for the ARM LPAE io-pgtable
code, so that IOMMU drivers can call it when they need to map
a scatter-gather list.
Signed-off-by: Isaac J. Manjarres <isaacm@...eaurora.org>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
---
drivers/iommu/io-pgtable-arm.c | 86 ++++++++++++++++++++++++++++++++++++++++++
drivers/iommu/iommu.c | 12 +++---
include/linux/iommu.h | 8 ++++
3 files changed, 101 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 87def58..0c11529 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -473,6 +473,91 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
return ret;
}
+static int arm_lpae_map_by_pgsize(struct io_pgtable_ops *ops,
+ unsigned long iova, phys_addr_t paddr,
+ size_t size, int iommu_prot, gfp_t gfp,
+ size_t *mapped)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ arm_lpae_iopte *ptep = data->pgd;
+ int ret, lvl = data->start_level;
+ arm_lpae_iopte prot = arm_lpae_prot_to_pte(data, iommu_prot);
+ unsigned int min_pagesz = 1 << __ffs(cfg->pgsize_bitmap);
+ long iaext = (s64)(iova + size - 1) >> cfg->ias;
+ size_t pgsize;
+
+ if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
+ pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
+ iova, &paddr, size, min_pagesz);
+ return -EINVAL;
+ }
+
+ if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
+ iaext = ~iaext;
+ if (WARN_ON(iaext || (paddr + size - 1) >> cfg->oas))
+ return -ERANGE;
+
+ while (size) {
+ pgsize = iommu_pgsize(cfg->pgsize_bitmap, iova | paddr, size);
+ ret = __arm_lpae_map(data, iova, paddr, pgsize, prot, lvl, ptep,
+ gfp);
+ if (ret)
+ return ret;
+
+ iova += pgsize;
+ paddr += pgsize;
+ *mapped += pgsize;
+ size -= pgsize;
+ }
+
+ return 0;
+}
+
+static int arm_lpae_map_sg(struct io_pgtable_ops *ops, unsigned long iova,
+ struct scatterlist *sg, unsigned int nents,
+ int iommu_prot, gfp_t gfp, size_t *mapped)
+{
+
+ size_t len = 0;
+ unsigned int i = 0;
+ int ret;
+ phys_addr_t start;
+
+ *mapped = 0;
+
+ /* If no access, then nothing to do */
+ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
+ return 0;
+
+ while (i <= nents) {
+ phys_addr_t s_phys = sg_phys(sg);
+
+ if (len && s_phys != start + len) {
+ ret = arm_lpae_map_by_pgsize(ops, iova + *mapped, start,
+ len, iommu_prot, gfp,
+ mapped);
+
+ if (ret)
+ return ret;
+
+ len = 0;
+ }
+
+ if (len) {
+ len += sg->length;
+ } else {
+ len = sg->length;
+ start = s_phys;
+ }
+
+ if (++i < nents)
+ sg = sg_next(sg);
+ }
+
+ return 0;
+}
+
static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
arm_lpae_iopte *ptep)
{
@@ -750,6 +835,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
data->iop.ops = (struct io_pgtable_ops) {
.map = arm_lpae_map,
+ .map_sg = arm_lpae_map_sg,
.unmap = arm_lpae_unmap,
.iova_to_phys = arm_lpae_iova_to_phys,
};
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ffeebda..0da0687 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2346,8 +2346,8 @@ phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
}
EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
-static size_t iommu_pgsize(struct iommu_domain *domain,
- unsigned long addr_merge, size_t size)
+size_t iommu_pgsize(unsigned long pgsize_bitmap, unsigned long addr_merge,
+ size_t size)
{
unsigned int pgsize_idx;
size_t pgsize;
@@ -2366,7 +2366,7 @@ static size_t iommu_pgsize(struct iommu_domain *domain,
pgsize = (1UL << (pgsize_idx + 1)) - 1;
/* throw away page sizes not supported by the hardware */
- pgsize &= domain->pgsize_bitmap;
+ pgsize &= pgsize_bitmap;
/* make sure we're still sane */
BUG_ON(!pgsize);
@@ -2412,7 +2412,8 @@ static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
while (size) {
- size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
+ size_t pgsize = iommu_pgsize(domain->pgsize_bitmap,
+ iova | paddr, size);
pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n",
iova, &paddr, pgsize);
@@ -2490,7 +2491,8 @@ static size_t __iommu_unmap(struct iommu_domain *domain,
* or we hit an area that isn't mapped.
*/
while (unmapped < size) {
- size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);
+ size_t pgsize = iommu_pgsize(domain->pgsize_bitmap, iova,
+ size - unmapped);
unmapped_page = ops->unmap(domain, iova, pgsize, iotlb_gather);
if (!unmapped_page)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index b3f0e20..0e40a38 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -438,6 +438,8 @@ extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
struct device *dev, ioasid_t pasid);
extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
+extern size_t iommu_pgsize(unsigned long pgsize_bitmap, unsigned long addr_mer,
+ size_t size);
extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot);
extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova,
@@ -690,6 +692,12 @@ static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
return NULL;
}
+static inline size_t iommu_pgsize(unsigned long pgsize_bitmap,
+ unsigned long addr_merge, size_t size)
+{
+ return 0;
+}
+
static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot)
{
--
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