[PATCH v6 19/20] iommu/dma: Add support for mapping MSIs
Robin Murphy
robin.murphy at arm.com
Tue Sep 6 08:33:52 PDT 2016
When an MSI doorbell is located downstream of an IOMMU, attaching
devices to a DMA ops domain and switching on translation leads to a rude
shock when their attempt to write to the physical address returned by
the irqchip driver faults (or worse, writes into some already-mapped
buffer) and no interrupt is forthcoming.
Address this by adding a hook for relevant irqchip drivers to call from
their compose_msi_msg() callback, to swizzle the physical address with
an appropriatly-mapped IOVA for any device attached to one of our DMA
ops domains.
CC: Thomas Gleixner <tglx at linutronix.de>
CC: Jason Cooper <jason at lakedaemon.net>
CC: Marc Zyngier <marc.zyngier at arm.com>
CC: linux-kernel at vger.kernel.org
Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
- Rework map_page() helper function plus insane lookup logic into
straightforward get_page() helper
- Use phys_addr_t to further simplify address matching
- Fix the bit where I neglected to actually round the doorbell
address to a page boundary (oops!)
---
drivers/iommu/dma-iommu.c | 130 ++++++++++++++++++++++++++++++++++-----
drivers/irqchip/irq-gic-v2m.c | 3 +
drivers/irqchip/irq-gic-v3-its.c | 3 +
include/linux/dma-iommu.h | 9 +++
4 files changed, 130 insertions(+), 15 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 00c8a08d56e7..90f9c6b7d472 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -25,10 +25,28 @@
#include <linux/huge_mm.h>
#include <linux/iommu.h>
#include <linux/iova.h>
+#include <linux/irq.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/vmalloc.h>
+struct iommu_dma_msi_page {
+ struct list_head list;
+ dma_addr_t iova;
+ phys_addr_t phys;
+};
+
+struct iommu_dma_cookie {
+ struct iova_domain iovad;
+ struct list_head msi_page_list;
+ spinlock_t msi_lock;
+};
+
+static inline struct iova_domain *cookie_iovad(struct iommu_domain *domain)
+{
+ return &((struct iommu_dma_cookie *)domain->iova_cookie)->iovad;
+}
+
int iommu_dma_init(void)
{
return iova_cache_get();
@@ -43,15 +61,19 @@ int iommu_dma_init(void)
*/
int iommu_get_dma_cookie(struct iommu_domain *domain)
{
- struct iova_domain *iovad;
+ struct iommu_dma_cookie *cookie;
if (domain->iova_cookie)
return -EEXIST;
- iovad = kzalloc(sizeof(*iovad), GFP_KERNEL);
- domain->iova_cookie = iovad;
+ cookie = kzalloc(sizeof(*cookie), GFP_KERNEL);
+ if (!cookie)
+ return -ENOMEM;
- return iovad ? 0 : -ENOMEM;
+ spin_lock_init(&cookie->msi_lock);
+ INIT_LIST_HEAD(&cookie->msi_page_list);
+ domain->iova_cookie = cookie;
+ return 0;
}
EXPORT_SYMBOL(iommu_get_dma_cookie);
@@ -63,14 +85,20 @@ EXPORT_SYMBOL(iommu_get_dma_cookie);
*/
void iommu_put_dma_cookie(struct iommu_domain *domain)
{
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iommu_dma_cookie *cookie = domain->iova_cookie;
+ struct iommu_dma_msi_page *msi, *tmp;
- if (!iovad)
+ if (!cookie)
return;
- if (iovad->granule)
- put_iova_domain(iovad);
- kfree(iovad);
+ if (cookie->iovad.granule)
+ put_iova_domain(&cookie->iovad);
+
+ list_for_each_entry_safe(msi, tmp, &cookie->msi_page_list, list) {
+ list_del(&msi->list);
+ kfree(msi);
+ }
+ kfree(cookie);
domain->iova_cookie = NULL;
}
EXPORT_SYMBOL(iommu_put_dma_cookie);
@@ -88,7 +116,7 @@ EXPORT_SYMBOL(iommu_put_dma_cookie);
*/
int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size)
{
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iova_domain *iovad = cookie_iovad(domain);
unsigned long order, base_pfn, end_pfn;
if (!iovad)
@@ -155,7 +183,7 @@ int dma_direction_to_prot(enum dma_data_direction dir, bool coherent)
static struct iova *__alloc_iova(struct iommu_domain *domain, size_t size,
dma_addr_t dma_limit)
{
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iova_domain *iovad = cookie_iovad(domain);
unsigned long shift = iova_shift(iovad);
unsigned long length = iova_align(iovad, size) >> shift;
@@ -171,7 +199,7 @@ static struct iova *__alloc_iova(struct iommu_domain *domain, size_t size,
/* The IOVA allocator knows what we mapped, so just unmap whatever that was */
static void __iommu_dma_unmap(struct iommu_domain *domain, dma_addr_t dma_addr)
{
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iova_domain *iovad = cookie_iovad(domain);
unsigned long shift = iova_shift(iovad);
unsigned long pfn = dma_addr >> shift;
struct iova *iova = find_iova(iovad, pfn);
@@ -294,7 +322,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
void (*flush_page)(struct device *, const void *, phys_addr_t))
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iova_domain *iovad = cookie_iovad(domain);
struct iova *iova;
struct page **pages;
struct sg_table sgt;
@@ -386,7 +414,7 @@ dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
{
dma_addr_t dma_addr;
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iova_domain *iovad = cookie_iovad(domain);
phys_addr_t phys = page_to_phys(page) + offset;
size_t iova_off = iova_offset(iovad, phys);
size_t len = iova_align(iovad, size + iova_off);
@@ -495,7 +523,7 @@ int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, int prot)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
- struct iova_domain *iovad = domain->iova_cookie;
+ struct iova_domain *iovad = cookie_iovad(domain);
struct iova *iova;
struct scatterlist *s, *prev = NULL;
dma_addr_t dma_addr;
@@ -587,3 +615,75 @@ int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return dma_addr == DMA_ERROR_CODE;
}
+
+static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
+ phys_addr_t msi_addr, struct iommu_domain *domain)
+{
+ struct iommu_dma_cookie *cookie = domain->iova_cookie;
+ struct iommu_dma_msi_page *msi_page;
+ struct iova_domain *iovad = &cookie->iovad;
+ struct iova *iova;
+ int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+ msi_addr &= ~(phys_addr_t)iova_mask(iovad);
+ list_for_each_entry(msi_page, &cookie->msi_page_list, list)
+ if (msi_page->phys == msi_addr)
+ return msi_page;
+
+ msi_page = kzalloc(sizeof(*msi_page), GFP_ATOMIC);
+ if (!msi_page)
+ return NULL;
+
+ iova = __alloc_iova(domain, iovad->granule, dma_get_mask(dev));
+ if (!iova)
+ goto out_free_page;
+
+ msi_page->phys = msi_addr;
+ msi_page->iova = iova_dma_addr(iovad, iova);
+ if (iommu_map(domain, msi_page->iova, msi_addr, iovad->granule, prot))
+ goto out_free_iova;
+
+ INIT_LIST_HEAD(&msi_page->list);
+ list_add(&msi_page->list, &cookie->msi_page_list);
+ return msi_page;
+
+out_free_iova:
+ __free_iova(iovad, iova);
+out_free_page:
+ kfree(msi_page);
+ return NULL;
+}
+
+void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
+{
+ struct device *dev = msi_desc_to_dev(irq_get_msi_desc(irq));
+ struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+ struct iommu_dma_cookie *cookie;
+ struct iommu_dma_msi_page *msi_page;
+ phys_addr_t msi_addr = (u64)msg->address_hi << 32 | msg->address_lo;
+
+ if (!domain || !domain->iova_cookie)
+ return;
+
+ cookie = domain->iova_cookie;
+
+ spin_lock(&cookie->msi_lock);
+ msi_page = iommu_dma_get_msi_page(dev, msi_addr, domain);
+ spin_unlock(&cookie->msi_lock);
+
+ if (WARN_ON(!msi_page)) {
+ /*
+ * We're called from a void callback, so the best we can do is
+ * 'fail' by filling the message with obviously bogus values.
+ * Since we got this far due to an IOMMU being present, it's
+ * not like the existing address would have worked anyway...
+ */
+ msg->address_hi = ~0U;
+ msg->address_lo = ~0U;
+ msg->data = ~0U;
+ } else {
+ msg->address_hi = upper_32_bits(msi_page->iova);
+ msg->address_lo &= iova_mask(&cookie->iovad);
+ msg->address_lo += lower_32_bits(msi_page->iova);
+ }
+}
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 35eb7ac5d21f..863e073c6f7f 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -16,6 +16,7 @@
#define pr_fmt(fmt) "GICv2m: " fmt
#include <linux/acpi.h>
+#include <linux/dma-iommu.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
@@ -108,6 +109,8 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
msg->data -= v2m->spi_offset;
+
+ iommu_dma_map_msi_msg(data->irq, msg);
}
static struct irq_chip gicv2m_irq_chip = {
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 36b9c28a5c91..98ff669d5962 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -18,6 +18,7 @@
#include <linux/bitmap.h>
#include <linux/cpu.h>
#include <linux/delay.h>
+#include <linux/dma-iommu.h>
#include <linux/interrupt.h>
#include <linux/log2.h>
#include <linux/mm.h>
@@ -655,6 +656,8 @@ static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
msg->address_lo = addr & ((1UL << 32) - 1);
msg->address_hi = addr >> 32;
msg->data = its_get_event_id(d);
+
+ iommu_dma_map_msi_msg(d->irq, msg);
}
static struct irq_chip its_irq_chip = {
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 81c5c8d167ad..5ee806e41b5c 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -21,6 +21,7 @@
#ifdef CONFIG_IOMMU_DMA
#include <linux/iommu.h>
+#include <linux/msi.h>
int iommu_dma_init(void);
@@ -62,9 +63,13 @@ void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
int iommu_dma_supported(struct device *dev, u64 mask);
int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
+/* The DMA API isn't _quite_ the whole story, though... */
+void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
+
#else
struct iommu_domain;
+struct msi_msg;
static inline int iommu_dma_init(void)
{
@@ -80,6 +85,10 @@ static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
{
}
+static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
+{
+}
+
#endif /* CONFIG_IOMMU_DMA */
#endif /* __KERNEL__ */
#endif /* __DMA_IOMMU_H */
--
2.8.1.dirty
More information about the linux-arm-kernel
mailing list