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authorAlexey Kardashevskiy <aik@ozlabs.ru>2015-06-05 16:35:20 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2015-06-11 15:16:52 +1000
commit4793d65d1ac056d92b594d05c6aab3c040d913dd (patch)
tree634824f7b5a7b65480bcf56b46506587801c1d06 /arch
parentbbb845c4bac88d8feffa8945dd28b50849984e30 (diff)
downloadlinux-4793d65d1ac056d92b594d05c6aab3c040d913dd.tar.bz2
vfio: powerpc/spapr: powerpc/powernv/ioda: Define and implement DMA windows API
This extends iommu_table_group_ops by a set of callbacks to support dynamic DMA windows management. create_table() creates a TCE table with specific parameters. it receives iommu_table_group to know nodeid in order to allocate TCE table memory closer to the PHB. The exact format of allocated multi-level table might be also specific to the PHB model (not the case now though). This callback calculated the DMA window offset on a PCI bus from @num and stores it in a just created table. set_window() sets the window at specified TVT index + @num on PHB. unset_window() unsets the window from specified TVT. This adds a free() callback to iommu_table_ops to free the memory (potentially a tree of tables) allocated for the TCE table. create_table() and free() are supposed to be called once per VFIO container and set_window()/unset_window() are supposed to be called for every group in a container. This adds IOMMU capabilities to iommu_table_group such as default 32bit window parameters and others. This makes use of new values in vfio_iommu_spapr_tce. IODA1/P5IOC2 do not support DDW so they do not advertise pagemasks to the userspace. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/iommu.h19
-rw-r--r--arch/powerpc/platforms/powernv/pci-ioda.c96
-rw-r--r--arch/powerpc/platforms/powernv/pci-p5ioc2.c7
3 files changed, 113 insertions, 9 deletions
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 706cfc0b1190..e5541759a37d 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -70,6 +70,7 @@ struct iommu_table_ops {
/* get() returns a physical address */
unsigned long (*get)(struct iommu_table *tbl, long index);
void (*flush)(struct iommu_table *tbl);
+ void (*free)(struct iommu_table *tbl);
};
/* These are used by VIO */
@@ -146,6 +147,17 @@ extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
struct iommu_table_group;
struct iommu_table_group_ops {
+ long (*create_table)(struct iommu_table_group *table_group,
+ int num,
+ __u32 page_shift,
+ __u64 window_size,
+ __u32 levels,
+ struct iommu_table **ptbl);
+ long (*set_window)(struct iommu_table_group *table_group,
+ int num,
+ struct iommu_table *tblnew);
+ long (*unset_window)(struct iommu_table_group *table_group,
+ int num);
/* Switch ownership from platform code to external user (e.g. VFIO) */
void (*take_ownership)(struct iommu_table_group *table_group);
/* Switch ownership from external user (e.g. VFIO) back to core */
@@ -159,6 +171,13 @@ struct iommu_table_group_link {
};
struct iommu_table_group {
+ /* IOMMU properties */
+ __u32 tce32_start;
+ __u32 tce32_size;
+ __u64 pgsizes; /* Bitmap of supported page sizes */
+ __u32 max_dynamic_windows_supported;
+ __u32 max_levels;
+
struct iommu_group *group;
struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
struct iommu_table_group_ops *ops;
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 21d8c61f0b03..ee3e643c16bb 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -25,6 +25,7 @@
#include <linux/memblock.h>
#include <linux/iommu.h>
#include <linux/rculist.h>
+#include <linux/sizes.h>
#include <asm/sections.h>
#include <asm/io.h>
@@ -1870,6 +1871,12 @@ static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);
}
+static void pnv_ioda2_table_free(struct iommu_table *tbl)
+{
+ pnv_pci_ioda2_table_free_pages(tbl);
+ iommu_free_table(tbl, "pnv");
+}
+
static struct iommu_table_ops pnv_ioda2_iommu_ops = {
.set = pnv_ioda2_tce_build,
#ifdef CONFIG_IOMMU_API
@@ -1877,6 +1884,7 @@ static struct iommu_table_ops pnv_ioda2_iommu_ops = {
#endif
.clear = pnv_ioda2_tce_free,
.get = pnv_tce_get,
+ .free = pnv_ioda2_table_free,
};
static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
@@ -1947,6 +1955,8 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
TCE_PCI_SWINV_PAIR);
tbl->it_ops = &pnv_ioda1_iommu_ops;
+ pe->table_group.tce32_start = tbl->it_offset << tbl->it_page_shift;
+ pe->table_group.tce32_size = tbl->it_size << tbl->it_page_shift;
iommu_init_table(tbl, phb->hose->node);
if (pe->flags & PNV_IODA_PE_DEV) {
@@ -1985,7 +1995,7 @@ static long pnv_pci_ioda2_set_window(struct iommu_table_group *table_group,
const __u64 start_addr = tbl->it_offset << tbl->it_page_shift;
const __u64 win_size = tbl->it_size << tbl->it_page_shift;
- pe_info(pe, "Setting up window %llx..%llx pg=%x\n",
+ pe_info(pe, "Setting up window#%d %llx..%llx pg=%x\n", num,
start_addr, start_addr + win_size - 1,
IOMMU_PAGE_SIZE(tbl));
@@ -1995,7 +2005,7 @@ static long pnv_pci_ioda2_set_window(struct iommu_table_group *table_group,
*/
rc = opal_pci_map_pe_dma_window(phb->opal_id,
pe->pe_number,
- pe->pe_number << 1,
+ (pe->pe_number << 1) + num,
tbl->it_indirect_levels + 1,
__pa(tbl->it_base),
size << 3,
@@ -2040,7 +2050,67 @@ static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable)
pe->tce_bypass_enabled = enable;
}
+static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset,
+ __u32 page_shift, __u64 window_size, __u32 levels,
+ struct iommu_table *tbl);
+
+static long pnv_pci_ioda2_create_table(struct iommu_table_group *table_group,
+ int num, __u32 page_shift, __u64 window_size, __u32 levels,
+ struct iommu_table **ptbl)
+{
+ struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
+ table_group);
+ int nid = pe->phb->hose->node;
+ __u64 bus_offset = num ? pe->tce_bypass_base : table_group->tce32_start;
+ long ret;
+ struct iommu_table *tbl;
+
+ tbl = pnv_pci_table_alloc(nid);
+ if (!tbl)
+ return -ENOMEM;
+
+ ret = pnv_pci_ioda2_table_alloc_pages(nid,
+ bus_offset, page_shift, window_size,
+ levels, tbl);
+ if (ret) {
+ iommu_free_table(tbl, "pnv");
+ return ret;
+ }
+
+ tbl->it_ops = &pnv_ioda2_iommu_ops;
+ if (pe->phb->ioda.tce_inval_reg)
+ tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);
+
+ *ptbl = tbl;
+
+ return 0;
+}
+
#ifdef CONFIG_IOMMU_API
+static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
+ int num)
+{
+ struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
+ table_group);
+ struct pnv_phb *phb = pe->phb;
+ long ret;
+
+ pe_info(pe, "Removing DMA window #%d\n", num);
+
+ ret = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
+ (pe->pe_number << 1) + num,
+ 0/* levels */, 0/* table address */,
+ 0/* table size */, 0/* page size */);
+ if (ret)
+ pe_warn(pe, "Unmapping failed, ret = %ld\n", ret);
+ else
+ pnv_pci_ioda2_tce_invalidate_entire(pe);
+
+ pnv_pci_unlink_table_and_group(table_group->tables[num], table_group);
+
+ return ret;
+}
+
static void pnv_ioda2_take_ownership(struct iommu_table_group *table_group)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
@@ -2060,6 +2130,9 @@ static void pnv_ioda2_release_ownership(struct iommu_table_group *table_group)
}
static struct iommu_table_group_ops pnv_pci_ioda2_ops = {
+ .create_table = pnv_pci_ioda2_create_table,
+ .set_window = pnv_pci_ioda2_set_window,
+ .unset_window = pnv_pci_ioda2_unset_window,
.take_ownership = pnv_ioda2_take_ownership,
.release_ownership = pnv_ioda2_release_ownership,
};
@@ -2214,7 +2287,7 @@ static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl)
static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
struct pnv_ioda_pe *pe)
{
- struct iommu_table *tbl;
+ struct iommu_table *tbl = NULL;
int64_t rc;
/* We shouldn't already have a 32-bit DMA associated */
@@ -2224,10 +2297,8 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
/* TVE #1 is selected by PCI address bit 59 */
pe->tce_bypass_base = 1ull << 59;
- tbl = pnv_pci_table_alloc(phb->hose->node);
iommu_register_group(&pe->table_group, phb->hose->global_number,
pe->pe_number);
- pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group);
/* The PE will reserve all possible 32-bits space */
pe->tce32_seg = 0;
@@ -2235,13 +2306,22 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
phb->ioda.m32_pci_base);
/* Setup linux iommu table */
- rc = pnv_pci_ioda2_table_alloc_pages(pe->phb->hose->node,
- 0, IOMMU_PAGE_SHIFT_4K, phb->ioda.m32_pci_base,
- POWERNV_IOMMU_DEFAULT_LEVELS, tbl);
+ pe->table_group.tce32_start = 0;
+ pe->table_group.tce32_size = phb->ioda.m32_pci_base;
+ pe->table_group.max_dynamic_windows_supported =
+ IOMMU_TABLE_GROUP_MAX_TABLES;
+ pe->table_group.max_levels = POWERNV_IOMMU_MAX_LEVELS;
+ pe->table_group.pgsizes = SZ_4K | SZ_64K | SZ_16M;
+
+ rc = pnv_pci_ioda2_create_table(&pe->table_group, 0,
+ IOMMU_PAGE_SHIFT_4K,
+ pe->table_group.tce32_size,
+ POWERNV_IOMMU_DEFAULT_LEVELS, &tbl);
if (rc) {
pe_err(pe, "Failed to create 32-bit TCE table, err %ld", rc);
goto fail;
}
+ pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group);
tbl->it_ops = &pnv_ioda2_iommu_ops;
iommu_init_table(tbl, phb->hose->node);
diff --git a/arch/powerpc/platforms/powernv/pci-p5ioc2.c b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
index eaec85b63b34..f2bdfea3b68d 100644
--- a/arch/powerpc/platforms/powernv/pci-p5ioc2.c
+++ b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
@@ -127,6 +127,8 @@ static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np, u64 hub_id,
u64 phb_id;
int64_t rc;
static int primary = 1;
+ struct iommu_table_group *table_group;
+ struct iommu_table *tbl;
pr_info(" Initializing p5ioc2 PHB %s\n", np->full_name);
@@ -201,7 +203,10 @@ static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np, u64 hub_id,
* hotplug or SRIOV on P5IOC2 and therefore iommu_free_table()
* should not be called for phb->p5ioc2.table_group.tables[0] ever.
*/
- phb->p5ioc2.table_group.tables[0] = &phb->p5ioc2.iommu_table;
+ tbl = phb->p5ioc2.table_group.tables[0] = &phb->p5ioc2.iommu_table;
+ table_group = &phb->p5ioc2.table_group;
+ table_group->tce32_start = tbl->it_offset << tbl->it_page_shift;
+ table_group->tce32_size = tbl->it_size << tbl->it_page_shift;
}
void __init pnv_pci_init_p5ioc2_hub(struct device_node *np)