From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: linuxppc-dev@lists.ozlabs.org
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Alex Williamson <alex.williamson@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH kernel v7 13/31] vfio: powerpc/spapr: powerpc/iommu: Rework IOMMU ownership control
Date: Sat, 28 Mar 2015 01:54:57 +1100 [thread overview]
Message-ID: <1427468115-2224-14-git-send-email-aik@ozlabs.ru> (raw)
In-Reply-To: <1427468115-2224-1-git-send-email-aik@ozlabs.ru>
This replaces iommu_take_ownership()/iommu_release_ownership() calls
with the callback calls and it is up to the platform code to call
iommu_take_ownership()/iommu_release_ownership() if needed.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
arch/powerpc/include/asm/iommu.h | 4 +--
arch/powerpc/kernel/iommu.c | 50 ++++++++++++++++++++++++++++---------
drivers/vfio/vfio_iommu_spapr_tce.c | 4 +--
3 files changed, 42 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 667aa1a..b9e50d3 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -225,8 +225,8 @@ extern unsigned long iommu_clear_tce(struct iommu_table *tbl,
unsigned long entry);
extern void iommu_flush_tce(struct iommu_table *tbl);
-extern int iommu_take_ownership(struct iommu_table *tbl);
-extern void iommu_release_ownership(struct iommu_table *tbl);
+extern int iommu_take_ownership(struct iommu_table_group *table_group);
+extern void iommu_release_ownership(struct iommu_table_group *table_group);
extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
extern unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir);
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index fd49c8e..7d6089b 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1050,7 +1050,7 @@ int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
}
EXPORT_SYMBOL_GPL(iommu_tce_build);
-int iommu_take_ownership(struct iommu_table *tbl)
+static int iommu_table_take_ownership(struct iommu_table *tbl)
{
unsigned long sz = (tbl->it_size + 7) >> 3;
@@ -1064,19 +1064,36 @@ int iommu_take_ownership(struct iommu_table *tbl)
memset(tbl->it_map, 0xff, sz);
- /*
- * Disable iommu bypass, otherwise the user can DMA to all of
- * our physical memory via the bypass window instead of just
- * the pages that has been explicitly mapped into the iommu
- */
- if (tbl->set_bypass)
- tbl->set_bypass(tbl, false);
+ return 0;
+}
+
+static void iommu_table_release_ownership(struct iommu_table *tbl);
+
+int iommu_take_ownership(struct iommu_table_group *table_group)
+{
+ int i, j, rc = 0;
+
+ for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+ struct iommu_table *tbl = &table_group->tables[i];
+
+ if (!tbl->it_map)
+ continue;
+
+ rc = iommu_table_take_ownership(tbl);
+ if (rc) {
+ for (j = 0; j < i; ++j)
+ iommu_table_release_ownership(
+ &table_group->tables[j]);
+
+ return rc;
+ }
+ }
return 0;
}
EXPORT_SYMBOL_GPL(iommu_take_ownership);
-void iommu_release_ownership(struct iommu_table *tbl)
+static void iommu_table_release_ownership(struct iommu_table *tbl)
{
unsigned long sz = (tbl->it_size + 7) >> 3;
@@ -1086,9 +1103,18 @@ void iommu_release_ownership(struct iommu_table *tbl)
if (tbl->it_offset == 0)
set_bit(0, tbl->it_map);
- /* The kernel owns the device now, we can restore the iommu bypass */
- if (tbl->set_bypass)
- tbl->set_bypass(tbl, true);
+}
+
+extern void iommu_release_ownership(struct iommu_table_group *table_group)
+{
+ int i;
+
+ for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+ struct iommu_table *tbl = &table_group->tables[i];
+
+ if (tbl->it_map)
+ iommu_table_release_ownership(tbl);
+ }
}
EXPORT_SYMBOL_GPL(iommu_release_ownership);
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index d61aad2..9f38351 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -535,7 +535,7 @@ static int tce_iommu_attach_group(void *iommu_data,
goto unlock_exit;
}
- ret = iommu_take_ownership(&table_group->tables[0]);
+ ret = iommu_take_ownership(table_group);
if (!ret)
container->grp = iommu_group;
@@ -572,7 +572,7 @@ static void tce_iommu_detach_group(void *iommu_data,
table_group = iommu_group_get_iommudata(iommu_group);
BUG_ON(!table_group);
- iommu_release_ownership(&table_group->tables[0]);
+ iommu_release_ownership(table_group);
unlock_exit:
mutex_unlock(&container->lock);
--
2.0.0
next prev parent reply other threads:[~2015-03-27 15:02 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 14:54 [PATCH kernel v7 00/31] powerpc/iommu/vfio: Enable Dynamic DMA windows Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 01/31] vfio: powerpc/spapr: Move page pinning from arch code to VFIO IOMMU driver Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 02/31] vfio: powerpc/spapr: Do cleanup when releasing the group Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 03/31] vfio: powerpc/spapr: Check that TCE page size is equal to it_page_size Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 04/31] vfio: powerpc/spapr: Use it_page_size Alexey Kardashevskiy
2015-04-01 21:48 ` Alex Williamson
2015-04-02 2:30 ` Alexey Kardashevskiy
2015-04-02 2:50 ` Alex Williamson
2015-04-02 3:40 ` Alexey Kardashevskiy
2015-04-02 3:46 ` Alex Williamson
2015-03-27 14:54 ` [PATCH kernel v7 05/31] vfio: powerpc/spapr: Move locked_vm accounting to helpers Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 06/31] vfio: powerpc/spapr: Disable DMA mappings on disabled container Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 07/31] vfio: powerpc/spapr: Moving pinning/unpinning to helpers Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 08/31] vfio: powerpc/spapr: Rework groups attaching Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 09/31] powerpc/powernv: Do not set "read" flag if direction==DMA_NONE Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 10/31] powerpc/iommu: Move tce_xxx callbacks from ppc_md to iommu_table Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 11/31] powerpc/iommu: Introduce iommu_table_alloc() helper Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 12/31] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group Alexey Kardashevskiy
2015-03-31 21:34 ` Alex Williamson
2015-04-01 21:48 ` Alex Williamson
2015-04-02 2:33 ` Alexey Kardashevskiy
2015-04-02 2:51 ` Alex Williamson
2015-03-27 14:54 ` Alexey Kardashevskiy [this message]
2015-03-27 14:54 ` [PATCH kernel v7 14/31] vfio: powerpc/spapr: powerpc/powernv/ioda2: Rework IOMMU ownership control Alexey Kardashevskiy
2015-03-27 14:54 ` [PATCH kernel v7 15/31] powerpc/iommu: Fix IOMMU ownership control functions Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 16/31] powerpc/powernv/ioda/ioda2: Rework tce_build()/tce_free() Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 17/31] powerpc/iommu/powernv: Release replaced TCE Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 18/31] powerpc/powernv/ioda2: Rework iommu_table creation Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 19/31] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_create_table/pnc_pci_free_table Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 20/31] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_set_window Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 21/31] powerpc/iommu: Split iommu_free_table into 2 helpers Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 22/31] powerpc/powernv: Implement multilevel TCE tables Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 23/31] powerpc/powernv: Change prototypes to receive iommu Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 24/31] powerpc/powernv/ioda: Define and implement DMA table/window management callbacks Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 25/31] vfio: powerpc/spapr: powerpc/powernv/ioda2: Rework ownership Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 26/31] powerpc/iommu: Add userspace view of TCE table Alexey Kardashevskiy
2015-04-02 20:50 ` Alex Williamson
2015-04-08 3:22 ` Alexey Kardashevskiy
2015-04-08 15:43 ` Alex Williamson
2015-04-09 3:21 ` Alexey Kardashevskiy
2015-04-09 3:46 ` Alex Williamson
2015-03-27 14:55 ` [PATCH kernel v7 27/31] powerpc/iommu/ioda2: Add get_table_size() to calculate the size of fiture table Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 28/31] powerpc/mmu: Add userspace-to-physical addresses translation cache Alexey Kardashevskiy
2015-04-01 21:48 ` Alex Williamson
2015-04-02 2:35 ` Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 29/31] vfio: powerpc/spapr: Register memory and define IOMMU v2 Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 30/31] vfio: powerpc/spapr: Support multiple groups in one container if possible Alexey Kardashevskiy
2015-03-27 14:55 ` [PATCH kernel v7 31/31] vfio: powerpc/spapr: Support Dynamic DMA windows Alexey Kardashevskiy
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