From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: linuxppc-dev@lists.ozlabs.org
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Gavin Shan <gwshan@linux.vnet.ibm.com>,
Alexander Graf <agraf@suse.de>,
Alex Williamson <alex.williamson@redhat.com>,
Paul Mackerras <paulus@samba.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH v4 26/28] vfio: powerpc/spapr: Rework an IOMMU group attach/detach
Date: Mon, 16 Feb 2015 21:06:18 +1100 [thread overview]
Message-ID: <1424081180-4494-27-git-send-email-aik@ozlabs.ru> (raw)
In-Reply-To: <1424081180-4494-1-git-send-email-aik@ozlabs.ru>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
drivers/vfio/vfio_iommu_spapr_tce.c | 62 +++++++++++++++++++++++--------------
1 file changed, 38 insertions(+), 24 deletions(-)
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index fdcc04c..4ff8289 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -435,7 +435,7 @@ static void tce_iommu_release(void *iommu_data)
iommu = iommu_group_get_iommudata(container->grp);
tbl = &iommu->tables[0];
tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
-
+ iommu->ops->free_table(tbl);
tce_iommu_detach_group(iommu_data, container->grp);
}
@@ -796,6 +796,7 @@ static int tce_iommu_attach_group(void *iommu_data,
int ret = 0;
struct tce_container *container = iommu_data;
struct powerpc_iommu *iommu;
+ struct iommu_table tbltmp = { 0 }, *tbl = &tbltmp;
mutex_lock(&container->lock);
@@ -806,35 +807,44 @@ static int tce_iommu_attach_group(void *iommu_data,
iommu_group_id(container->grp),
iommu_group_id(iommu_group));
ret = -EBUSY;
- } else if (container->enabled) {
+ goto unlock_exit;
+ }
+
+ if (container->enabled) {
pr_err("tce_vfio: attaching group #%u to enabled container\n",
iommu_group_id(iommu_group));
ret = -EBUSY;
+ goto unlock_exit;
+ }
+
+ iommu = iommu_group_get_iommudata(iommu_group);
+ if (WARN_ON_ONCE(!iommu)) {
+ ret = -ENXIO;
+ goto unlock_exit;
+ }
+
+ /*
+ * 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 (iommu->ops && iommu->ops->set_ownership) {
+ iommu->ops->set_ownership(iommu, true);
} else {
- iommu = iommu_group_get_iommudata(iommu_group);
- if (WARN_ON_ONCE(!iommu)) {
- ret = -ENXIO;
- } else if (iommu->ops && iommu->ops->set_ownership) {
- /*
- * 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
- */
- struct iommu_table tbltmp = { 0 }, *tbl = &tbltmp;
-
- iommu->ops->set_ownership(iommu, true);
- container->grp = iommu_group;
-
- ret = iommu->ops->create_table(iommu, 0,
- IOMMU_PAGE_SHIFT_4K,
- ilog2(iommu->tce32_size), 1, tbl);
- if (!ret)
- ret = iommu->ops->set_window(iommu, 0, tbl);
- } else {
- ret = -ENODEV;
- }
+ ret = -ENODEV;
+ goto unlock_exit;
}
+ container->grp = iommu_group;
+
+ /* Create the default window as only now we know the parameters */
+ ret = iommu->ops->create_table(iommu, 0,
+ IOMMU_PAGE_SHIFT_4K,
+ ilog2(iommu->tce32_size), 1, tbl);
+ if (!ret)
+ ret = iommu->ops->set_window(iommu, 0, tbl);
+
+unlock_exit:
mutex_unlock(&container->lock);
return ret;
@@ -845,6 +855,7 @@ static void tce_iommu_detach_group(void *iommu_data,
{
struct tce_container *container = iommu_data;
struct powerpc_iommu *iommu;
+ long i;
mutex_lock(&container->lock);
if (iommu_group != container->grp) {
@@ -865,6 +876,9 @@ static void tce_iommu_detach_group(void *iommu_data,
iommu = iommu_group_get_iommudata(iommu_group);
BUG_ON(!iommu);
+ for (i = 0; i < POWERPC_IOMMU_MAX_TABLES; ++i)
+ iommu->ops->unset_window(iommu, i);
+
/* Kernel owns the device now, we can restore bypass */
if (iommu->ops && iommu->ops->set_ownership)
iommu->ops->set_ownership(iommu, false);
--
2.0.0
next prev parent reply other threads:[~2015-02-16 10:08 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-16 10:05 [PATCH v4 00/28] powerpc/iommu/vfio: Enable Dynamic DMA windows Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 01/28] vfio: powerpc/spapr: Move page pinning from arch code to VFIO IOMMU driver Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 02/28] vfio: powerpc/spapr: Do cleanup when releasing the group Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 03/28] vfio: powerpc/spapr: Check that TCE page size is equal to it_page_size Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 04/28] vfio: powerpc/spapr: Use it_page_size Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 05/28] vfio: powerpc/spapr: Move locked_vm accounting to helpers Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 06/28] vfio: powerpc/spapr: Disable DMA mappings on disabled container Alexey Kardashevskiy
2015-02-16 10:05 ` [PATCH v4 07/28] vfio: powerpc/spapr: Moving pinning/unpinning to helpers Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 08/28] vfio: powerpc/spapr: Register memory Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 09/28] powerpc/powernv: Do not set "read" flag if direction==DMA_NONE Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 10/28] powerpc/iommu: Move tce_xxx callbacks from ppc_md to iommu_table Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 11/28] powerpc/iommu: Introduce iommu_table_alloc() helper Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 12/28] powerpc/spapr: vfio: Switch from iommu_table to new powerpc_iommu Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 13/28] powerpc/iommu: Fix IOMMU ownership control functions Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 14/28] vfio: powerpc/spapr: powerpc/powernv/ioda2: Rework IOMMU ownership control Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 15/28] powerpc/powernv/ioda/ioda2: Rework tce_build()/tce_free() Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 16/28] powerpc/iommu/powernv: Release replaced TCE Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 17/28] powerpc/pseries/lpar: Enable VFIO Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 18/28] poweppc/powernv/ioda2: Rework iommu_table creation Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 19/28] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_create_table Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 20/28] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_set_window Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 21/28] powerpc/iommu: Split iommu_free_table into 2 helpers Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 22/28] powerpc/powernv: Implement multilevel TCE tables Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 23/28] powerpc/powernv: Change prototypes to receive iommu Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 24/28] powerpc/powernv/ioda: Define and implement DMA table/window management callbacks Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 25/28] vfio: powerpc/spapr: powerpc/powernv/ioda2: Rework ownership Alexey Kardashevskiy
2015-02-16 10:06 ` Alexey Kardashevskiy [this message]
2015-02-16 10:06 ` [PATCH v4 27/28] vfio: powerpc/spapr: Register memory Alexey Kardashevskiy
2015-02-20 2:18 ` Alexey Kardashevskiy
2015-02-16 10:06 ` [PATCH v4 28/28] vfio: powerpc/spapr: Support Dynamic DMA windows Alexey Kardashevskiy
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