[PATCH 3/4] VT-d: changes to support KVM

Ben-Ami Yassour
2008-07-22T12:14:17Z

From: Kay, Allen M <allen.m.kay@intel.com>

This patch extends the VT-d driver to support KVM

[Ben: fixed memory pinning]

Signed-off-by: Kay, Allen M <allen.m.kay@intel.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Ben-Ami Yassour <benami@il.ibm.com>
---
drivers/pci/dmar.c | 4 +-
drivers/pci/intel-iommu.c | 117 +++++++++++++++++++++++++-
drivers/pci/iova.c | 2 +-
{drivers/pci => include/linux}/intel-iommu.h | 11 +++
{drivers/pci => include/linux}/iova.h | 0
5 files changed, 127 insertions(+), 7 deletions(-)
rename {drivers/pci => include/linux}/intel-iommu.h (94%)
rename {drivers/pci => include/linux}/iova.h (100%)

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index f941f60..a58a5b0 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -26,8 +26,8 @@

#include <linux/pci.h>
#include <linux/dmar.h>
-#include "iova.h"
-#include "intel-iommu.h"
+#include <linux/iova.h>
+#include <linux/intel-iommu.h>

#undef PREFIX
#define PREFIX "DMAR:"
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 3f7b81c..212bc30 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -20,6 +20,7 @@
* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
*/

+#undef DEBUG
#include <linux/init.h>
#include <linux/bitmap.h>
#include <linux/debugfs.h>
@@ -33,8 +34,8 @@
#include <linux/dma-mapping.h>
#include <linux/mempool.h>
#include <linux/timer.h>
-#include "iova.h"
-#include "intel-iommu.h"
+#include <linux/iova.h>
+#include <linux/intel-iommu.h>
#include <asm/proto.h> /* force_iommu in this header in x86-64*/
#include <asm/cacheflush.h>
#include <asm/gart.h>
@@ -160,7 +161,7 @@ static inline void *alloc_domain_mem(void)
return iommu_kmem_cache_alloc(iommu_domain_cache);
}

-static inline void free_domain_mem(void *vaddr)
+static void free_domain_mem(void *vaddr)
{
kmem_cache_free(iommu_domain_cache, vaddr);
}
@@ -1414,7 +1415,7 @@ static void domain_remove_dev_info(struct dmar_domain *domain)
* find_domain
* Note: we use struct pci_dev->dev.archdata.iommu stores the info
*/
-struct dmar_domain *
+static struct dmar_domain *
find_domain(struct pci_dev *pdev)
{
struct device_domain_info *info;
@@ -2430,3 +2431,111 @@ int __init intel_iommu_init(void)
return 0;
}

+void intel_iommu_domain_exit(struct dmar_domain *domain)
+{
+ u64 end;
+
+ /* Domain 0 is reserved, so dont process it */
+ if (!domain)
+ return;
+
+ end = DOMAIN_MAX_ADDR(domain->gaw);
+ end = end & (~PAGE_MASK_4K);
+
+ /* clear ptes */
+ dma_pte_clear_range(domain, 0, end);
+
+ /* free page tables */
+ dma_pte_free_pagetable(domain, 0, end);
+
+ iommu_free_domain(domain);
+ free_domain_mem(domain);
+}
+EXPORT_SYMBOL_GPL(intel_iommu_domain_exit);
+
+struct dmar_domain *intel_iommu_domain_alloc(struct pci_dev *pdev)
+{
+ struct dmar_drhd_unit *drhd;
+ struct dmar_domain *domain;
+ struct intel_iommu *iommu;
+
+ drhd = dmar_find_matched_drhd_unit(pdev);
+ if (!drhd) {
+ printk(KERN_ERR "intel_iommu_domain_alloc: drhd == NULL\n");
+ return NULL;
+ }
+
+ iommu = drhd->iommu;
+ if (!iommu) {
+ printk(KERN_ERR
+ "intel_iommu_domain_alloc: iommu == NULL\n");
+ return NULL;
+ }
+ domain = iommu_alloc_domain(iommu);
+ if (!domain) {
+ printk(KERN_ERR
+ "intel_iommu_domain_alloc: domain == NULL\n");
+ return NULL;
+ }
+ if (domain_init(domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
+ printk(KERN_ERR
+ "intel_iommu_domain_alloc: domain_init() failed\n");
+ intel_iommu_domain_exit(domain);
+ return NULL;
+ }
+ return domain;
+}
+EXPORT_SYMBOL_GPL(intel_iommu_domain_alloc);
+
+int intel_iommu_context_mapping(
+ struct dmar_domain *domain, struct pci_dev *pdev)
+{
+ int rc;
+ rc = domain_context_mapping(domain, pdev);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(intel_iommu_context_mapping);
+
+int intel_iommu_page_mapping(
+ struct dmar_domain *domain, dma_addr_t iova,
+ u64 hpa, size_t size, int prot)
+{
+ int rc;
+ rc = domain_page_mapping(domain, iova, hpa, size, prot);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(intel_iommu_page_mapping);
+
+void intel_iommu_detach_dev(struct dmar_domain *domain, u8 bus, u8 devfn)
+{
+ detach_domain_for_dev(domain, bus, devfn);
+}
+EXPORT_SYMBOL_GPL(intel_iommu_detach_dev);
+
+struct dmar_domain *
+intel_iommu_find_domain(struct pci_dev *pdev)
+{
+ return find_domain(pdev);
+}
+EXPORT_SYMBOL_GPL(intel_iommu_find_domain);
+
+int intel_iommu_found(void)
+{
+ return g_num_of_iommus;
+}
+EXPORT_SYMBOL_GPL(intel_iommu_found);
+
+u64 intel_iommu_iova_to_pfn(struct dmar_domain *domain, u64 iova)
+{
+ struct dma_pte *pte;
+ u64 pfn;
+
+ pfn = 0;
+ pte = addr_to_dma_pte(domain, iova);
+
+ if (pte)
+ pfn = dma_pte_addr(*pte);
+
+ return pfn >> PAGE_SHIFT_4K;
+}
+EXPORT_SYMBOL_GPL(intel_iommu_iova_to_pfn);
diff --git a/drivers/pci/iova.c b/drivers/pci/iova.c
index 3ef4ac0..2287116 100644
--- a/drivers/pci/iova.c
+++ b/drivers/pci/iova.c
@@ -7,7 +7,7 @@
* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
*/

-#include "iova.h"
+#include <linux/iova.h>

void
init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit)
diff --git a/drivers/pci/intel-iommu.h b/include/linux/intel-iommu.h
similarity index 94%
rename from drivers/pci/intel-iommu.h
rename to include/linux/intel-iommu.h
index afc0ad9..1490fc0 100644
--- a/drivers/pci/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -341,4 +341,15 @@ static inline void iommu_prepare_gfx_mapping(void)
}
#endif /* !CONFIG_DMAR_GFX_WA */

+void intel_iommu_domain_exit(struct dmar_domain *domain);
+struct dmar_domain *intel_iommu_domain_alloc(struct pci_dev *pdev);
+int intel_iommu_context_mapping(struct dmar_domain *domain,
+ struct pci_dev *pdev);
+int intel_iommu_page_mapping(struct dmar_domain *domain, dma_addr_t iova,
+ u64 hpa, size_t size, int prot);
+void intel_iommu_detach_dev(struct dmar_domain *domain, u8 bus, u8 devfn);
+struct dmar_domain *intel_iommu_find_domain(struct pci_dev *pdev);
+int intel_iommu_found(void);
+u64 intel_iommu_iova_to_pfn(struct dmar_domain *domain, u64 iova);
+
#endif
diff --git a/drivers/pci/iova.h b/include/linux/iova.h
similarity index 100%
rename from drivers/pci/iova.h
rename to include/linux/iova.h
--
1.5.6