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iommu/io-pgtable-arm: Implement arm_lpae_map_pages() 

Implement the map_pages() callback for the ARM LPAE io-pgtable
format.

Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
Link: https://lore.kernel.org/r/1623850736-389584-12-git-send-email-quic_c_gdjako@quicinc.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Isaac J. Manjarres 2021-06-16 06:38:52 -07:00 committed by Joerg Roedel
parent 1fe27be5ff
commit 4a77b12deb
1 changed files with 31 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/iommu/io-pgtable-arm.c
View File

@ -341,20 +341,30 @@ static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
}
static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
phys_addr_t paddr, size_t size, arm_lpae_iopte prot,
int lvl, arm_lpae_iopte *ptep, gfp_t gfp)
phys_addr_t paddr, size_t size, size_t pgcount,
arm_lpae_iopte prot, int lvl, arm_lpae_iopte *ptep,
gfp_t gfp, size_t *mapped)
{
arm_lpae_iopte *cptep, pte;
size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
size_t tblsz = ARM_LPAE_GRANULE(data);
struct io_pgtable_cfg *cfg = &data->iop.cfg;
int ret = 0, num_entries, max_entries, map_idx_start;
/* Find our entry at the current level */
ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
map_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
ptep += map_idx_start;
/* If we can install a leaf entry at this level, then do so */
if (size == block_size)
return arm_lpae_init_pte(data, iova, paddr, prot, lvl, 1, ptep);
if (size == block_size) {
max_entries = ARM_LPAE_PTES_PER_TABLE(data) - map_idx_start;
num_entries = min_t(int, pgcount, max_entries);
ret = arm_lpae_init_pte(data, iova, paddr, prot, lvl, num_entries, ptep);
if (!ret && mapped)
*mapped += num_entries * size;
return ret;
}
/* We can't allocate tables at the final level */
if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
@ -383,7 +393,8 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
}
/* Rinse, repeat */
return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep, gfp);
return __arm_lpae_map(data, iova, paddr, size, pgcount, prot, lvl + 1,
cptep, gfp, mapped);
}
static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
@ -450,8 +461,9 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
return pte;
}
static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t size, int iommu_prot, gfp_t gfp)
static int arm_lpae_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t pgsize, size_t pgcount,
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;
@ -460,7 +472,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
arm_lpae_iopte prot;
long iaext = (s64)iova >> cfg->ias;
if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize))
return -EINVAL;
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
@ -473,7 +485,8 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
return 0;
prot = arm_lpae_prot_to_pte(data, iommu_prot);
ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep, gfp);
ret = __arm_lpae_map(data, iova, paddr, pgsize, pgcount, prot, lvl,
ptep, gfp, mapped);
/*
* Synchronise all PTE updates for the new mapping before there's
* a chance for anything to kick off a table walk for the new iova.
@ -483,6 +496,13 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
return ret;
}
static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t size, int iommu_prot, gfp_t gfp)
{
return arm_lpae_map_pages(ops, iova, paddr, size, 1, iommu_prot, gfp,
NULL);
}
static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
arm_lpae_iopte *ptep)
{
@ -787,6 +807,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
data->iop.ops = (struct io_pgtable_ops) {
.map = arm_lpae_map,
.map_pages = arm_lpae_map_pages,
.unmap = arm_lpae_unmap,
.unmap_pages = arm_lpae_unmap_pages,
.iova_to_phys = arm_lpae_iova_to_phys,