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

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

Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
Link: https://lore.kernel.org/r/1623850736-389584-11-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 06:38:51 -07:00 committed by Joerg Roedel
parent 41e1eb2546
commit 1fe27be5ff
1 changed files with 73 additions and 45 deletions
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118
drivers/iommu/io-pgtable-arm.c
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@ -46,6 +46,9 @@
#define ARM_LPAE_PGD_SIZE(d) \
(sizeof(arm_lpae_iopte) << (d)->pgd_bits)
#define ARM_LPAE_PTES_PER_TABLE(d) \
(ARM_LPAE_GRANULE(d) >> ilog2(sizeof(arm_lpae_iopte)))
/*
* Calculate the index at level l used to map virtual address a using the
* pagetable in d.
@ -239,22 +242,19 @@ static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep, int num_entries,
sizeof(*ptep) * num_entries, DMA_TO_DEVICE);
}
static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
int num_entries, struct io_pgtable_cfg *cfg)
static void __arm_lpae_clear_pte(arm_lpae_iopte *ptep, struct io_pgtable_cfg *cfg)
{
int i;
for (i = 0; i < num_entries; i++)
ptep[i] = pte;
*ptep = 0;
if (!cfg->coherent_walk)
__arm_lpae_sync_pte(ptep, num_entries, cfg);
__arm_lpae_sync_pte(ptep, 1, cfg);
}
static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size, int lvl,
arm_lpae_iopte *ptep);
unsigned long iova, size_t size, size_t pgcount,
int lvl, arm_lpae_iopte *ptep);
static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
phys_addr_t paddr, arm_lpae_iopte prot,
@ -298,7 +298,7 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
if (__arm_lpae_unmap(data, NULL, iova + i * sz, sz,
if (__arm_lpae_unmap(data, NULL, iova + i * sz, sz, 1,
lvl, tblp) != sz) {
WARN_ON(1);
return -EINVAL;
@ -526,14 +526,15 @@ static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size,
arm_lpae_iopte blk_pte, int lvl,
arm_lpae_iopte *ptep)
arm_lpae_iopte *ptep, size_t pgcount)
{
struct io_pgtable_cfg *cfg = &data->iop.cfg;
arm_lpae_iopte pte, *tablep;
phys_addr_t blk_paddr;
size_t tablesz = ARM_LPAE_GRANULE(data);
size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
int i, unmap_idx = -1;
int ptes_per_table = ARM_LPAE_PTES_PER_TABLE(data);
int i, unmap_idx_start = -1, num_entries = 0, max_entries;
if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
return 0;
@ -542,15 +543,18 @@ static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
if (!tablep)
return 0; /* Bytes unmapped */
if (size == split_sz)
unmap_idx = ARM_LPAE_LVL_IDX(iova, lvl, data);
if (size == split_sz) {
unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
max_entries = ptes_per_table - unmap_idx_start;
num_entries = min_t(int, pgcount, max_entries);
}
blk_paddr = iopte_to_paddr(blk_pte, data);
pte = iopte_prot(blk_pte);
for (i = 0; i < tablesz / sizeof(pte); i++, blk_paddr += split_sz) {
for (i = 0; i < ptes_per_table; i++, blk_paddr += split_sz) {
/* Unmap! */
if (i == unmap_idx)
if (i >= unmap_idx_start && i < (unmap_idx_start + num_entries))
continue;
__arm_lpae_init_pte(data, blk_paddr, pte, lvl, 1, &tablep[i]);
@ -568,76 +572,92 @@ static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
return 0;
tablep = iopte_deref(pte, data);
} else if (unmap_idx >= 0) {
io_pgtable_tlb_add_page(&data->iop, gather, iova, size);
return size;
} else if (unmap_idx_start >= 0) {
for (i = 0; i < num_entries; i++)
io_pgtable_tlb_add_page(&data->iop, gather, iova + i * size, size);
return num_entries * size;
}
return __arm_lpae_unmap(data, gather, iova, size, lvl, tablep);
return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl, tablep);
}
static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size, int lvl,
arm_lpae_iopte *ptep)
unsigned long iova, size_t size, size_t pgcount,
int lvl, arm_lpae_iopte *ptep)
{
arm_lpae_iopte pte;
struct io_pgtable *iop = &data->iop;
int i = 0, num_entries, max_entries, unmap_idx_start;
/* Something went horribly wrong and we ran out of page table */
if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
return 0;
ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
ptep += unmap_idx_start;
pte = READ_ONCE(*ptep);
if (WARN_ON(!pte))
return 0;
/* If the size matches this level, we're in the right place */
if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
__arm_lpae_set_pte(ptep, 0, 1, &iop->cfg);
max_entries = ARM_LPAE_PTES_PER_TABLE(data) - unmap_idx_start;
num_entries = min_t(int, pgcount, max_entries);
if (!iopte_leaf(pte, lvl, iop->fmt)) {
/* Also flush any partial walks */
io_pgtable_tlb_flush_walk(iop, iova, size,
ARM_LPAE_GRANULE(data));
ptep = iopte_deref(pte, data);
__arm_lpae_free_pgtable(data, lvl + 1, ptep);
} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
/*
* Order the PTE update against queueing the IOVA, to
* guarantee that a flush callback from a different CPU
* has observed it before the TLBIALL can be issued.
*/
smp_wmb();
} else {
io_pgtable_tlb_add_page(iop, gather, iova, size);
while (i < num_entries) {
pte = READ_ONCE(*ptep);
if (WARN_ON(!pte))
break;
__arm_lpae_clear_pte(ptep, &iop->cfg);
if (!iopte_leaf(pte, lvl, iop->fmt)) {
/* Also flush any partial walks */
io_pgtable_tlb_flush_walk(iop, iova + i * size, size,
ARM_LPAE_GRANULE(data));
__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
/*
* Order the PTE update against queueing the IOVA, to
* guarantee that a flush callback from a different CPU
* has observed it before the TLBIALL can be issued.
*/
smp_wmb();
} else {
io_pgtable_tlb_add_page(iop, gather, iova + i * size, size);
}
ptep++;
i++;
}
return size;
return i * size;
} else if (iopte_leaf(pte, lvl, iop->fmt)) {
/*
* Insert a table at the next level to map the old region,
* minus the part we want to unmap
*/
return arm_lpae_split_blk_unmap(data, gather, iova, size, pte,
lvl + 1, ptep);
lvl + 1, ptep, pgcount);
}
/* Keep on walkin' */
ptep = iopte_deref(pte, data);
return __arm_lpae_unmap(data, gather, iova, size, lvl + 1, ptep);
return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl + 1, ptep);
}
static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
size_t size, struct iommu_iotlb_gather *gather)
static size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
size_t pgsize, size_t pgcount,
struct iommu_iotlb_gather *gather)
{
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;
long iaext = (s64)iova >> cfg->ias;
if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize || !pgcount))
return 0;
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
@ -645,7 +665,14 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
if (WARN_ON(iaext))
return 0;
return __arm_lpae_unmap(data, gather, iova, size, data->start_level, ptep);
return __arm_lpae_unmap(data, gather, iova, pgsize, pgcount,
data->start_level, ptep);
}
static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
size_t size, struct iommu_iotlb_gather *gather)
{
return arm_lpae_unmap_pages(ops, iova, size, 1, gather);
}
static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
@ -761,6 +788,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
data->iop.ops = (struct io_pgtable_ops) {
.map = arm_lpae_map,
.unmap = arm_lpae_unmap,
.unmap_pages = arm_lpae_unmap_pages,
.iova_to_phys = arm_lpae_iova_to_phys,
};