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aa4318a807
nixos/galvatron/apple-silicon-support/packages/linux-asahi/sven-iommu-4k.patch

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diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 4f1a37bdd42d..c8c3ea81d818 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -97,7 +97,6 @@ struct apple_dart_hw {
* @lock: lock for hardware operations involving this dart
* @pgsize: pagesize supported by this DART
* @supports_bypass: indicates if this DART supports bypass mode
- * @force_bypass: force bypass mode due to pagesize mismatch?
* @sid2group: maps stream ids to iommu_groups
* @iommu: iommu core device
*/
@@ -115,7 +114,6 @@ struct apple_dart {
u32 pgsize;
u32 supports_bypass : 1;
- u32 force_bypass : 1;
struct iommu_group *sid2group[DART_MAX_STREAMS];
struct iommu_device iommu;
@@ -499,9 +497,6 @@ static int apple_dart_attach_dev(struct iommu_domain *domain,
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
- if (cfg->stream_maps[0].dart->force_bypass &&
- domain->type != IOMMU_DOMAIN_IDENTITY)
- return -EINVAL;
if (!cfg->stream_maps[0].dart->supports_bypass &&
domain->type == IOMMU_DOMAIN_IDENTITY)
return -EINVAL;
@@ -630,8 +625,6 @@ static int apple_dart_of_xlate(struct device *dev, struct of_phandle_args *args)
if (cfg_dart) {
if (cfg_dart->supports_bypass != dart->supports_bypass)
return -EINVAL;
- if (cfg_dart->force_bypass != dart->force_bypass)
- return -EINVAL;
if (cfg_dart->pgsize != dart->pgsize)
return -EINVAL;
}
@@ -736,8 +729,6 @@ static int apple_dart_def_domain_type(struct device *dev)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
- if (cfg->stream_maps[0].dart->force_bypass)
- return IOMMU_DOMAIN_IDENTITY;
if (!cfg->stream_maps[0].dart->supports_bypass)
return IOMMU_DOMAIN_DMA;
@@ -1121,8 +1121,6 @@ static int apple_dart_probe(struct platform_device *pdev)
goto err_clk_disable;
}
- dart->force_bypass = dart->pgsize > PAGE_SIZE;
-
ret = apple_dart_hw_reset(dart);
if (ret)
goto err_clk_disable;
@@ -1149,8 +1147,8 @@ static int apple_dart_probe(struct platform_device *pdev)
dev_info(
&pdev->dev,
- "DART [pagesize %x, %d streams, bypass support: %d, bypass forced: %d] initialized\n",
- dart->pgsize, dart->num_streams, dart->supports_bypass, dart->force_bypass);
+ "DART [pagesize %x, %d streams, bypass support: %d] initialized\n",
+ dart->pgsize, dart->num_streams, dart->supports_bypass);
return 0;
err_sysfs_remove:
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 09f6e1c0f9c0..094592751cfa 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -20,9 +20,11 @@
#include <linux/iommu.h>
#include <linux/iova.h>
#include <linux/irq.h>
+#include <linux/kernel.h>
#include <linux/list_sort.h>
#include <linux/mm.h>
#include <linux/mutex.h>
+#include <linux/pfn.h>
#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/spinlock.h>
@@ -710,6 +712,9 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
{
struct page **pages;
unsigned int i = 0, nid = dev_to_node(dev);
+ unsigned int j;
+ unsigned long min_order = __fls(order_mask);
+ unsigned int min_order_size = 1U << min_order;
order_mask &= (2U << MAX_ORDER) - 1;
if (!order_mask)
@@ -749,15 +754,37 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
split_page(page, order);
break;
}
- if (!page) {
- __iommu_dma_free_pages(pages, i);
- return NULL;
+
+ /*
+ * If we have no valid page here we might be trying to allocate
+ * the last block consisting of 1<<order pages (to guarantee
+ * alignment) but actually need less pages than that.
+ * In that case we just try to allocate the entire block and
+ * directly free the spillover pages again.
+ */
+ if (!page && !order_mask && count < min_order_size) {
+ page = alloc_pages_node(nid, gfp, min_order);
+ if (!page)
+ goto free_pages;
+ split_page(page, min_order);
+
+ for (j = count; j < min_order_size; ++j)
+ __free_page(page + j);
+
+ order_size = count;
}
+
+ if (!page)
+ goto free_pages;
count -= order_size;
while (order_size--)
pages[i++] = page++;
}
return pages;
+
+free_pages:
+ __iommu_dma_free_pages(pages, i);
+ return NULL;
}
/*
@@ -785,16 +787,28 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
bool coherent = dev_is_dma_coherent(dev);
int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap;
+ struct sg_append_table sgt_append = {};
+ struct scatterlist *last_sg;
struct page **pages;
dma_addr_t iova;
ssize_t ret;
+ phys_addr_t orig_s_phys;
+ size_t orig_s_len, orig_s_off, s_iova_off, iova_size;
if (static_branch_unlikely(&iommu_deferred_attach_enabled) &&
iommu_deferred_attach(dev, domain))
return NULL;
min_size = alloc_sizes & -alloc_sizes;
- if (min_size < PAGE_SIZE) {
+ if (iovad->granule > PAGE_SIZE) {
+ if (size < iovad->granule) {
+ /* ensure a single contiguous allocation */
+ min_size = ALIGN(size, PAGE_SIZE*(1U<<get_order(size)));
+ alloc_sizes = min_size;
+ }
+
+ size = PAGE_ALIGN(size);
+ } else if (min_size < PAGE_SIZE) {
min_size = PAGE_SIZE;
alloc_sizes |= PAGE_SIZE;
} else {
@@ -797,13 +836,17 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
if (!pages)
return NULL;
- size = iova_align(iovad, size);
- iova = iommu_dma_alloc_iova(domain, size, dev->coherent_dma_mask, dev);
+ iova_size = iova_align(iovad, size);
+ iova = iommu_dma_alloc_iova(domain, iova_size, dev->coherent_dma_mask, dev);
if (!iova)
goto out_free_pages;
- if (sg_alloc_table_from_pages(sgt, pages, count, 0, size, GFP_KERNEL))
+ /* append_table is only used to get a pointer to the last entry */
+ if (sg_alloc_append_table_from_pages(&sgt_append, pages, count, 0,
+ iova_size, UINT_MAX, 0, GFP_KERNEL))
goto out_free_iova;
+ memcpy(sgt, &sgt_append.sgt, sizeof(*sgt));
+ last_sg = sgt_append.prv;
if (!(ioprot & IOMMU_CACHE)) {
struct scatterlist *sg;
@@ -825,18 +839,59 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
arch_dma_prep_coherent(sg_page(sg), sg->length);
}
+ if (iovad->granule > PAGE_SIZE) {
+ if (size < iovad->granule) {
+ /*
+ * we only have a single sg list entry here that is
+ * likely not aligned to iovad->granule. adjust the
+ * entry to represent the encapsulating IOMMU page
+ * and then later restore everything to its original
+ * values, similar to the impedance matching done in
+ * iommu_dma_map_sg.
+ */
+ orig_s_phys = sg_phys(sgt->sgl);
+ orig_s_len = sgt->sgl->length;
+ orig_s_off = sgt->sgl->offset;
+ s_iova_off = iova_offset(iovad, orig_s_phys);
+
+ sg_set_page(sgt->sgl,
+ pfn_to_page(PHYS_PFN(orig_s_phys - s_iova_off)),
+ iova_align(iovad, orig_s_len + s_iova_off),
+ sgt->sgl->offset & ~s_iova_off);
+ } else {
+ /*
+ * convince iommu_map_sg_atomic to map the last block
+ * even though it may be too small.
+ */
+ orig_s_len = last_sg->length;
+ last_sg->length = iova_align(iovad, last_sg->length);
+ }
+ }
+
ret = iommu_map_sg_atomic(domain, iova, sgt->sgl, sgt->orig_nents, ioprot);
- if (ret < 0 || ret < size)
+ if (ret < 0 || ret < iova_size)
goto out_free_sg;
+ if (iovad->granule > PAGE_SIZE) {
+ if (size < iovad->granule) {
+ sg_set_page(sgt->sgl,
+ pfn_to_page(PHYS_PFN(orig_s_phys)),
+ orig_s_len, orig_s_off);
+
+ iova += s_iova_off;
+ } else {
+ last_sg->length = orig_s_len;
+ }
+ }
+
sgt->sgl->dma_address = iova;
- sgt->sgl->dma_length = size;
+ sgt->sgl->dma_length = iova_size;
return pages;
out_free_sg:
sg_free_table(sgt);
out_free_iova:
- iommu_dma_free_iova(cookie, iova, size, NULL);
+ iommu_dma_free_iova(cookie, iova, iova_size, NULL);
out_free_pages:
__iommu_dma_free_pages(pages, count);
return NULL;
@@ -1040,8 +1124,9 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents,
unsigned int s_length = sg_dma_len(s);
unsigned int s_iova_len = s->length;
- s->offset += s_iova_off;
- s->length = s_length;
+ sg_set_page(s,
+ pfn_to_page(PHYS_PFN(sg_phys(s) + s_iova_off)),
+ s_length, s_iova_off & ~PAGE_MASK);
sg_dma_address(s) = DMA_MAPPING_ERROR;
sg_dma_len(s) = 0;
@@ -1082,13 +1167,17 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents,
static void __invalidate_sg(struct scatterlist *sg, int nents)
{
struct scatterlist *s;
+ phys_addr_t orig_paddr;
int i;
for_each_sg(sg, s, nents, i) {
- if (sg_dma_address(s) != DMA_MAPPING_ERROR)
- s->offset += sg_dma_address(s);
- if (sg_dma_len(s))
- s->length = sg_dma_len(s);
+ if (sg_dma_len(s)) {
+ orig_paddr = sg_phys(s) + sg_dma_address(s);
+ sg_set_page(s,
+ pfn_to_page(PHYS_PFN(orig_paddr)),
+ sg_dma_len(s),
+ sg_dma_address(s) & ~PAGE_MASK);
+ }
sg_dma_address(s) = DMA_MAPPING_ERROR;
sg_dma_len(s) = 0;
}
@@ -1166,15 +1255,16 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
* stashing the unaligned parts in the as-yet-unused DMA fields.
*/
for_each_sg(sg, s, nents, i) {
- size_t s_iova_off = iova_offset(iovad, s->offset);
+ phys_addr_t s_phys = sg_phys(s);
+ size_t s_iova_off = iova_offset(iovad, s_phys);
size_t s_length = s->length;
size_t pad_len = (mask - iova_len + 1) & mask;
sg_dma_address(s) = s_iova_off;
sg_dma_len(s) = s_length;
- s->offset -= s_iova_off;
s_length = iova_align(iovad, s_length + s_iova_off);
- s->length = s_length;
+ sg_set_page(s, pfn_to_page(PHYS_PFN(s_phys - s_iova_off)),
+ s_length, s->offset & ~s_iova_off);
/*
* Due to the alignment of our single IOVA allocation, we can
@@ -1412,9 +1502,15 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
+ struct iommu_domain *domain = iommu_get_dma_domain(dev);
+ struct iommu_dma_cookie *cookie = domain->iova_cookie;
+ struct iova_domain *iovad = &cookie->iovad;
struct page *page;
int ret;
+ if (iovad->granule > PAGE_SIZE)
+ return -ENXIO;
+
if (is_vmalloc_addr(cpu_addr)) {
struct page **pages = dma_common_find_pages(cpu_addr);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f2c45b85b9fc..0c370e486d6e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -80,6 +80,8 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
unsigned type);
static int __iommu_attach_device(struct iommu_domain *domain,
struct device *dev);
+static void __iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev);
static int __iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group);
static void __iommu_detach_group(struct iommu_domain *domain,
@@ -1976,6 +1978,24 @@ void iommu_domain_free(struct iommu_domain *domain)
}
EXPORT_SYMBOL_GPL(iommu_domain_free);
+static int iommu_check_page_size(struct iommu_domain *domain,
+ struct device *dev)
+{
+ bool trusted = !(dev_is_pci(dev) && to_pci_dev(dev)->untrusted);
+
+ if (!iommu_is_paging_domain(domain))
+ return 0;
+ if (iommu_is_large_pages_domain(domain) && trusted)
+ return 0;
+
+ if (!(domain->pgsize_bitmap & (PAGE_SIZE | (PAGE_SIZE - 1)))) {
+ pr_warn("IOMMU pages cannot exactly represent CPU pages.\n");
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
static int __iommu_attach_device(struct iommu_domain *domain,
struct device *dev)
{
@@ -1985,9 +2005,23 @@ static int __iommu_attach_device(struct iommu_domain *domain,
return -ENODEV;
ret = domain->ops->attach_dev(domain, dev);
- if (!ret)
- trace_attach_device_to_domain(dev);
- return ret;
+ if (ret)
+ return ret;
+
+ /*
+ * Check that CPU pages can be represented by the IOVA granularity.
+ * This has to be done after ops->attach_dev since many IOMMU drivers
+ * only limit domain->pgsize_bitmap after having attached the first
+ * device.
+ */
+ ret = iommu_check_page_size(domain, dev);
+ if (ret) {
+ __iommu_detach_device(domain, dev);
+ return ret;
+ }
+
+ trace_attach_device_to_domain(dev);
+ return 0;
}
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index db77aa675145..180ce65a6789 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -49,10 +49,11 @@ init_iova_domain(struct iova_domain *iovad, unsigned long granule,
{
/*
* IOVA granularity will normally be equal to the smallest
- * supported IOMMU page size; both *must* be capable of
- * representing individual CPU pages exactly.
+ * supported IOMMU page size; while both usually are capable of
+ * representing individual CPU pages exactly the IOVA allocator
+ * supports any granularities that are an exact power of two.
*/
- BUG_ON((granule > PAGE_SIZE) || !is_power_of_2(granule));
+ BUG_ON(!is_power_of_2(granule));
spin_lock_init(&iovad->iova_rbtree_lock);
iovad->rbroot = RB_ROOT;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 9208eca4b0d1..dec2dd70a876 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -63,6 +63,8 @@ struct iommu_domain_geometry {
implementation */
#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
#define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */
+#define __IOMMU_DOMAIN_LP (1U << 4) /* Support for PAGE_SIZE smaller
+ than IOMMU page size */
/*
* This are the possible domain-types
@@ -82,10 +84,12 @@ struct iommu_domain_geometry {
#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
- __IOMMU_DOMAIN_DMA_API)
+ __IOMMU_DOMAIN_DMA_API | \
+ __IOMMU_DOMAIN_LP)
#define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
__IOMMU_DOMAIN_DMA_API | \
- __IOMMU_DOMAIN_DMA_FQ)
+ __IOMMU_DOMAIN_DMA_FQ | \
+ __IOMMU_DOMAIN_LP)
struct iommu_domain {
unsigned type;
@@ -102,6 +106,16 @@ static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
return domain->type & __IOMMU_DOMAIN_DMA_API;
}
+static inline bool iommu_is_paging_domain(struct iommu_domain *domain)
+{
+ return domain->type & __IOMMU_DOMAIN_PAGING;
+}
+
+static inline bool iommu_is_large_pages_domain(struct iommu_domain *domain)
+{
+ return domain->type & __IOMMU_DOMAIN_LP;
+}
+
enum iommu_cap {
IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
transactions */
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