@@ -1848,6 +1848,7 @@ F: drivers/clk/clk-apple-nco.c
F: drivers/i2c/busses/i2c-pasemi-core.c
F: drivers/i2c/busses/i2c-pasemi-platform.c
F: drivers/iommu/apple-dart.c
+F: drivers/iommu/io-pgtable-dart.c
F: drivers/irqchip/irq-apple-aic.c
F: drivers/mailbox/apple-mailbox.c
F: drivers/nvme/host/apple.c
@@ -67,6 +67,17 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
If unsure, say N here.
+config IOMMU_IO_PGTABLE_DART
+ bool "Apple DART Formats"
+ select IOMMU_IO_PGTABLE
+ depends on ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
+ help
+ Enable support for the Apple DART pagetable formats. These include
+ the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
+ SoCs.
+
+ If unsure, say N here.
+
endmenu
config IOMMU_DEBUGFS
@@ -294,7 +305,7 @@ config APPLE_DART
tristate "Apple DART IOMMU Support"
depends on ARCH_APPLE || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
- select IOMMU_IO_PGTABLE_LPAE
+ select IOMMU_IO_PGTABLE_DART
default ARCH_APPLE
help
Support for Apple DART (Device Address Resolution Table) IOMMUs
@@ -8,6 +8,7 @@ obj-$(CONFIG_IOMMU_DMA) += dma-iommu.o
obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
obj-$(CONFIG_IOMMU_IO_PGTABLE_ARMV7S) += io-pgtable-arm-v7s.o
obj-$(CONFIG_IOMMU_IO_PGTABLE_LPAE) += io-pgtable-arm.o
+obj-$(CONFIG_IOMMU_IO_PGTABLE_DART) += io-pgtable-dart.o
obj-$(CONFIG_IOASID) += ioasid.o
obj-$(CONFIG_IOMMU_IOVA) += iova.o
obj-$(CONFIG_OF_IOMMU) += of_iommu.o
@@ -130,9 +130,6 @@
#define ARM_MALI_LPAE_MEMATTR_IMP_DEF 0x88ULL
#define ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC 0x8DULL
-#define APPLE_DART_PTE_PROT_NO_WRITE (1<<7)
-#define APPLE_DART_PTE_PROT_NO_READ (1<<8)
-
/* IOPTE accessors */
#define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
@@ -406,15 +403,6 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
{
arm_lpae_iopte pte;
- if (data->iop.fmt == APPLE_DART) {
- pte = 0;
- if (!(prot & IOMMU_WRITE))
- pte |= APPLE_DART_PTE_PROT_NO_WRITE;
- if (!(prot & IOMMU_READ))
- pte |= APPLE_DART_PTE_PROT_NO_READ;
- return pte;
- }
-
if (data->iop.fmt == ARM_64_LPAE_S1 ||
data->iop.fmt == ARM_32_LPAE_S1) {
pte = ARM_LPAE_PTE_nG;
@@ -1107,52 +1095,6 @@ arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
return NULL;
}
-static struct io_pgtable *
-apple_dart_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
-{
- struct arm_lpae_io_pgtable *data;
- int i;
-
- if (cfg->oas > 36)
- return NULL;
-
- data = arm_lpae_alloc_pgtable(cfg);
- if (!data)
- return NULL;
-
- /*
- * The table format itself always uses two levels, but the total VA
- * space is mapped by four separate tables, making the MMIO registers
- * an effective "level 1". For simplicity, though, we treat this
- * equivalently to LPAE stage 2 concatenation at level 2, with the
- * additional TTBRs each just pointing at consecutive pages.
- */
- if (data->start_level < 1)
- goto out_free_data;
- if (data->start_level == 1 && data->pgd_bits > 2)
- goto out_free_data;
- if (data->start_level > 1)
- data->pgd_bits = 0;
- data->start_level = 2;
- cfg->apple_dart_cfg.n_ttbrs = 1 << data->pgd_bits;
- data->pgd_bits += data->bits_per_level;
-
- data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data), GFP_KERNEL,
- cfg);
- if (!data->pgd)
- goto out_free_data;
-
- for (i = 0; i < cfg->apple_dart_cfg.n_ttbrs; ++i)
- cfg->apple_dart_cfg.ttbr[i] =
- virt_to_phys(data->pgd + i * ARM_LPAE_GRANULE(data));
-
- return &data->iop;
-
-out_free_data:
- kfree(data);
- return NULL;
-}
-
struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
.alloc = arm_64_lpae_alloc_pgtable_s1,
.free = arm_lpae_free_pgtable,
@@ -1178,11 +1120,6 @@ struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns = {
.free = arm_lpae_free_pgtable,
};
-struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns = {
- .alloc = apple_dart_alloc_pgtable,
- .free = arm_lpae_free_pgtable,
-};
-
#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
static struct io_pgtable_cfg *cfg_cookie __initdata;
new file mode 100644
@@ -0,0 +1,427 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple DART page table allocator.
+ *
+ * Copyright (C) 2022 The Asahi Linux Contributors
+ *
+ * Based on io-pgtable-arm.
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#define pr_fmt(fmt) "dart io-pgtable: " fmt
+
+#include <linux/atomic.h>
+#include <linux/bitops.h>
+#include <linux/io-pgtable.h>
+#include <linux/kernel.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <asm/barrier.h>
+
+#define DART1_MAX_ADDR_BITS 36
+
+#define DART_MAX_TABLES 4
+#define DART_LEVELS 2
+
+/* Struct accessors */
+#define io_pgtable_to_data(x) \
+ container_of((x), struct dart_io_pgtable, iop)
+
+#define io_pgtable_ops_to_data(x) \
+ io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
+
+#define DART_GRANULE(d) \
+ (sizeof(dart_iopte) << (d)->bits_per_level)
+#define DART_PTES_PER_TABLE(d) \
+ (DART_GRANULE(d) >> ilog2(sizeof(dart_iopte)))
+
+#define APPLE_DART1_PADDR_MASK GENMASK_ULL(35, 12)
+
+/* Apple DART1 protection bits */
+#define APPLE_DART1_PTE_PROT_NO_READ BIT(8)
+#define APPLE_DART1_PTE_PROT_NO_WRITE BIT(7)
+#define APPLE_DART1_PTE_PROT_SP_DIS BIT(1)
+
+/* marks PTE as valid */
+#define APPLE_DART_PTE_VALID BIT(0)
+
+/* IOPTE accessors */
+#define iopte_deref(pte, d) __va(iopte_to_paddr(pte, d))
+
+struct dart_io_pgtable {
+ struct io_pgtable iop;
+
+ int tbl_bits;
+ int bits_per_level;
+
+ void *pgd[DART_MAX_TABLES];
+};
+
+typedef u64 dart_iopte;
+
+
+static dart_iopte paddr_to_iopte(phys_addr_t paddr,
+ struct dart_io_pgtable *data)
+{
+ return paddr & APPLE_DART1_PADDR_MASK;
+}
+
+static phys_addr_t iopte_to_paddr(dart_iopte pte,
+ struct dart_io_pgtable *data)
+{
+ return pte & APPLE_DART1_PADDR_MASK;
+}
+
+static void *__dart_alloc_pages(size_t size, gfp_t gfp,
+ struct io_pgtable_cfg *cfg)
+{
+ struct device *dev = cfg->iommu_dev;
+ int order = get_order(size);
+ struct page *p;
+
+ VM_BUG_ON((gfp & __GFP_HIGHMEM));
+ p = alloc_pages(gfp | __GFP_ZERO, order);
+ if (!p)
+ return NULL;
+
+ return page_address(p);
+}
+
+static int dart_init_pte(struct dart_io_pgtable *data,
+ unsigned long iova, phys_addr_t paddr,
+ dart_iopte prot, int num_entries,
+ dart_iopte *ptep)
+{
+ int i;
+ dart_iopte pte = prot;
+ size_t sz = data->iop.cfg.pgsize_bitmap;
+
+ for (i = 0; i < num_entries; i++)
+ if (ptep[i] & APPLE_DART_PTE_VALID) {
+ /* We require an unmap first */
+ WARN_ON(ptep[i] & APPLE_DART_PTE_VALID);
+ return -EEXIST;
+ }
+
+ pte |= APPLE_DART1_PTE_PROT_SP_DIS;
+ pte |= APPLE_DART_PTE_VALID;
+
+ for (i = 0; i < num_entries; i++)
+ ptep[i] = pte | paddr_to_iopte(paddr + i * sz, data);
+
+ return 0;
+}
+
+static dart_iopte dart_install_table(dart_iopte *table,
+ dart_iopte *ptep,
+ dart_iopte curr,
+ struct dart_io_pgtable *data)
+{
+ dart_iopte old, new;
+
+ new = paddr_to_iopte(__pa(table), data) | APPLE_DART_PTE_VALID;
+
+ /*
+ * Ensure the table itself is visible before its PTE can be.
+ * Whilst we could get away with cmpxchg64_release below, this
+ * doesn't have any ordering semantics when !CONFIG_SMP.
+ */
+ dma_wmb();
+
+ old = cmpxchg64_relaxed(ptep, curr, new);
+
+ return old;
+}
+
+static int dart_get_table(struct dart_io_pgtable *data, unsigned long iova)
+{
+ return (iova >> (3 * data->bits_per_level + ilog2(sizeof(dart_iopte)))) &
+ ((1 << data->tbl_bits) - 1);
+}
+
+static int dart_get_l1_index(struct dart_io_pgtable *data, unsigned long iova)
+{
+
+ return (iova >> (2 * data->bits_per_level + ilog2(sizeof(dart_iopte)))) &
+ ((1 << data->bits_per_level) - 1);
+}
+
+static int dart_get_l2_index(struct dart_io_pgtable *data, unsigned long iova)
+{
+
+ return (iova >> (data->bits_per_level + ilog2(sizeof(dart_iopte)))) &
+ ((1 << data->bits_per_level) - 1);
+}
+
+static dart_iopte *dart_get_l2(struct dart_io_pgtable *data, unsigned long iova)
+{
+ dart_iopte pte, *ptep;
+ int tbl = dart_get_table(data, iova);
+
+ ptep = data->pgd[tbl];
+ if (!ptep)
+ return NULL;
+
+ ptep += dart_get_l1_index(data, iova);
+ pte = READ_ONCE(*ptep);
+
+ /* Valid entry? */
+ if (!pte)
+ return NULL;
+
+ /* Deref to get level 2 table */
+ return iopte_deref(pte, data);
+}
+
+static dart_iopte dart_prot_to_pte(struct dart_io_pgtable *data,
+ int prot)
+{
+ dart_iopte pte = 0;
+
+ if (!(prot & IOMMU_WRITE))
+ pte |= APPLE_DART1_PTE_PROT_NO_WRITE;
+ if (!(prot & IOMMU_READ))
+ pte |= APPLE_DART1_PTE_PROT_NO_READ;
+
+ return pte;
+}
+
+static int dart_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 dart_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ size_t tblsz = DART_GRANULE(data);
+ int ret = 0, tbl, num_entries, max_entries, map_idx_start;
+ dart_iopte pte, *cptep, *ptep;
+ dart_iopte prot;
+
+ if (WARN_ON(pgsize != cfg->pgsize_bitmap))
+ return -EINVAL;
+
+ if (WARN_ON(paddr >> cfg->oas))
+ return -ERANGE;
+
+ /* If no access, then nothing to do */
+ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
+ return 0;
+
+ tbl = dart_get_table(data, iova);
+
+ ptep = data->pgd[tbl];
+ ptep += dart_get_l1_index(data, iova);
+ pte = READ_ONCE(*ptep);
+
+ /* no L2 table present */
+ if (!pte) {
+ cptep = __dart_alloc_pages(tblsz, gfp, cfg);
+ if (!cptep)
+ return -ENOMEM;
+
+ pte = dart_install_table(cptep, ptep, 0, data);
+ if (pte)
+ free_pages((unsigned long)cptep, get_order(tblsz));
+
+ /* L2 table is present (now) */
+ pte = READ_ONCE(*ptep);
+ }
+
+ ptep = iopte_deref(pte, data);
+
+ /* install a leaf entries into L2 table */
+ prot = dart_prot_to_pte(data, iommu_prot);
+ map_idx_start = dart_get_l2_index(data, iova);
+ max_entries = DART_PTES_PER_TABLE(data) - map_idx_start;
+ num_entries = min_t(int, pgcount, max_entries);
+ ptep += map_idx_start;
+ ret = dart_init_pte(data, iova, paddr, prot, num_entries, ptep);
+ if (!ret && mapped)
+ *mapped += num_entries * pgsize;
+
+ /*
+ * 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.
+ */
+ wmb();
+
+ return ret;
+}
+
+static size_t dart_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
+ size_t pgsize, size_t pgcount,
+ struct iommu_iotlb_gather *gather)
+{
+ struct dart_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+ int i = 0, num_entries, max_entries, unmap_idx_start;
+ dart_iopte pte, *ptep;
+
+ if (WARN_ON(pgsize != cfg->pgsize_bitmap || !pgcount))
+ return 0;
+
+ ptep = dart_get_l2(data, iova);
+
+ /* Valid L2 IOPTE pointer? */
+ if (WARN_ON(!ptep))
+ return 0;
+
+ unmap_idx_start = dart_get_l2_index(data, iova);
+ ptep += unmap_idx_start;
+
+ max_entries = DART_PTES_PER_TABLE(data) - unmap_idx_start;
+ num_entries = min_t(int, pgcount, max_entries);
+
+ while (i < num_entries) {
+ pte = READ_ONCE(*ptep);
+ if (WARN_ON(!pte))
+ break;
+
+ /* clear pte */
+ *ptep = 0;
+
+ if (!iommu_iotlb_gather_queued(gather))
+ io_pgtable_tlb_add_page(&data->iop, gather,
+ iova + i * pgsize, pgsize);
+
+ ptep++;
+ i++;
+ }
+
+ return i * pgsize;
+}
+
+static phys_addr_t dart_iova_to_phys(struct io_pgtable_ops *ops,
+ unsigned long iova)
+{
+ struct dart_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ dart_iopte pte, *ptep;
+
+ ptep = dart_get_l2(data, iova);
+
+ /* Valid L2 IOPTE pointer? */
+ if (!ptep)
+ return 0;
+
+ ptep += dart_get_l2_index(data, iova);
+
+ pte = READ_ONCE(*ptep);
+ /* Found translation */
+ if (pte) {
+ iova &= (data->iop.cfg.pgsize_bitmap - 1);
+ return iopte_to_paddr(pte, data) | iova;
+ }
+
+ /* Ran out of page tables to walk */
+ return 0;
+}
+
+static struct dart_io_pgtable *
+dart_alloc_pgtable(struct io_pgtable_cfg *cfg)
+{
+ struct dart_io_pgtable *data;
+ int tbl_bits, bits_per_level, va_bits, pg_shift;
+
+ pg_shift = __ffs(cfg->pgsize_bitmap);
+ bits_per_level = pg_shift - ilog2(sizeof(dart_iopte));
+
+ va_bits = cfg->ias - pg_shift;
+
+ tbl_bits = max_t(int, 0, va_bits - (bits_per_level * DART_LEVELS));
+ if ((1 << tbl_bits) > DART_MAX_TABLES)
+ return NULL;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+
+ data->tbl_bits = tbl_bits;
+ data->bits_per_level = bits_per_level;
+
+ data->iop.ops = (struct io_pgtable_ops) {
+ .map_pages = dart_map_pages,
+ .unmap_pages = dart_unmap_pages,
+ .iova_to_phys = dart_iova_to_phys,
+ };
+
+ return data;
+}
+
+static struct io_pgtable *
+apple_dart_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ struct dart_io_pgtable *data;
+ int i;
+
+ if (!cfg->coherent_walk)
+ return NULL;
+
+ if (cfg->oas > DART1_MAX_ADDR_BITS)
+ return NULL;
+
+ if (cfg->ias > cfg->oas)
+ return NULL;
+
+ if (!(cfg->pgsize_bitmap == SZ_4K || cfg->pgsize_bitmap == SZ_16K))
+ return NULL;
+
+ data = dart_alloc_pgtable(cfg);
+ if (!data)
+ return NULL;
+
+ cfg->apple_dart_cfg.n_ttbrs = 1 << data->tbl_bits;
+
+ for (i = 0; i < cfg->apple_dart_cfg.n_ttbrs; ++i) {
+ data->pgd[i] = __dart_alloc_pages(DART_GRANULE(data), GFP_KERNEL,
+ cfg);
+ if (!data->pgd[i])
+ goto out_free_data;
+ cfg->apple_dart_cfg.ttbr[i] = virt_to_phys(data->pgd[i]);
+ }
+
+ return &data->iop;
+
+out_free_data:
+ while (--i >= 0)
+ free_pages((unsigned long)data->pgd[i],
+ get_order(DART_GRANULE(data)));
+ kfree(data);
+ return NULL;
+}
+
+static void apple_dart_free_pgtable(struct io_pgtable *iop)
+{
+ struct dart_io_pgtable *data = io_pgtable_to_data(iop);
+ dart_iopte *ptep, *end;
+ int i;
+
+ for (i = 0; i < (1 << data->tbl_bits) && data->pgd[i]; ++i) {
+ ptep = data->pgd[i];
+ end = (void *)ptep + DART_GRANULE(data);
+
+ while (ptep != end) {
+ dart_iopte pte = *ptep++;
+
+ if (pte) {
+ unsigned long page =
+ (unsigned long)iopte_deref(pte, data);
+
+ free_pages(page, get_order(DART_GRANULE(data)));
+ }
+ }
+ free_pages((unsigned long)data->pgd[i],
+ get_order(DART_GRANULE(data)));
+ }
+
+ kfree(data);
+}
+
+struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns = {
+ .alloc = apple_dart_alloc_pgtable,
+ .free = apple_dart_free_pgtable,
+};
@@ -20,6 +20,8 @@ io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
[ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_init_fns,
+#endif
+#ifdef CONFIG_IOMMU_IO_PGTABLE_DART
[APPLE_DART] = &io_pgtable_apple_dart_init_fns,
#endif
#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S