From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: Gavin Shan <gwshan@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org,
Alex Williamson <alex.williamson@redhat.com>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH kernel v9 15/32] powerpc/powernv/ioda/ioda2: Rework TCE invalidation in tce_build()/tce_free()
Date: Thu, 30 Apr 2015 12:58:12 +1000 [thread overview]
Message-ID: <55419A44.9080804@ozlabs.ru> (raw)
In-Reply-To: <20150429031802.GL32589@voom.redhat.com>
On 04/29/2015 01:18 PM, David Gibson wrote:
> On Sat, Apr 25, 2015 at 10:14:39PM +1000, Alexey Kardashevskiy wrote:
>> The pnv_pci_ioda_tce_invalidate() helper invalidates TCE cache. It is
>> supposed to be called on IODA1/2 and not called on p5ioc2. It receives
>> start and end host addresses of TCE table.
>>
>> IODA2 actually needs PCI addresses to invalidate the cache. Those
>> can be calculated from host addresses but since we are going
>> to implement multi-level TCE tables, calculating PCI address from
>> a host address might get either tricky or ugly as TCE table remains flat
>> on PCI bus but not in RAM.
>>
>> This moves pnv_pci_ioda_tce_invalidate() from generic pnv_tce_build/
>> pnt_tce_free and defines IODA1/2-specific callbacks which call generic
>> ones and do PHB-model-specific TCE cache invalidation. P5IOC2 keeps
>> using generic callbacks as before.
>>
>> This changes pnv_pci_ioda2_tce_invalidate() to receives TCE index and
>> number of pages which are PCI addresses shifted by IOMMU page shift.
>>
>> No change in behaviour is expected.
>>
>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>> ---
>> Changes:
>> v9:
>> * removed confusing comment from commit log about unintentional calling of
>> pnv_pci_ioda_tce_invalidate()
>> * moved mechanical changes away to "powerpc/iommu: Move tce_xxx callbacks from ppc_md to iommu_table"
>> * fixed bug with broken invalidation in pnv_pci_ioda2_tce_invalidate -
>> @index includes @tbl->it_offset but old code added it anyway which later broke
>> DDW
>> ---
>> arch/powerpc/platforms/powernv/pci-ioda.c | 86 +++++++++++++++++++++----------
>> arch/powerpc/platforms/powernv/pci.c | 17 ++----
>> 2 files changed, 64 insertions(+), 39 deletions(-)
>>
>> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>> index 718d5cc..f070c44 100644
>> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
>> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>> @@ -1665,18 +1665,20 @@ static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe,
>> }
>> }
>>
>> -static void pnv_pci_ioda1_tce_invalidate(struct pnv_ioda_pe *pe,
>> - struct iommu_table *tbl,
>> - __be64 *startp, __be64 *endp, bool rm)
>> +static void pnv_pci_ioda1_tce_invalidate(struct iommu_table *tbl,
>> + unsigned long index, unsigned long npages, bool rm)
>> {
>> + struct pnv_ioda_pe *pe = container_of(tbl->it_table_group,
>> + struct pnv_ioda_pe, table_group);
>> __be64 __iomem *invalidate = rm ?
>> (__be64 __iomem *)pe->tce_inval_reg_phys :
>> (__be64 __iomem *)tbl->it_index;
>> unsigned long start, end, inc;
>> const unsigned shift = tbl->it_page_shift;
>>
>> - start = __pa(startp);
>> - end = __pa(endp);
>> + start = __pa((__be64 *)tbl->it_base + index - tbl->it_offset);
>> + end = __pa((__be64 *)tbl->it_base + index - tbl->it_offset +
>> + npages - 1);
>
> This doesn't look right. The arguments to __pa don't appear to be
> addresses (since index and if_offset are in units of (TCE) pages, not
> bytes).
tbl->it_base is an address and it is casted to __be64* which means:
(char*)tbl->it_base + (index - tbl->it_offset)*sizeof(__be64).
Which seems to be correct (I just removed extra braces compared to the old
code), no?
>
>>
>> /* BML uses this case for p6/p7/galaxy2: Shift addr and put in node */
>> if (tbl->it_busno) {
>> @@ -1712,16 +1714,40 @@ static void pnv_pci_ioda1_tce_invalidate(struct pnv_ioda_pe *pe,
>> */
>> }
>>
>> +static int pnv_ioda1_tce_build(struct iommu_table *tbl, long index,
>> + long npages, unsigned long uaddr,
>> + enum dma_data_direction direction,
>> + struct dma_attrs *attrs)
>> +{
>> + long ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
>> + attrs);
>> +
>> + if (!ret && (tbl->it_type & TCE_PCI_SWINV_CREATE))
>> + pnv_pci_ioda1_tce_invalidate(tbl, index, npages, false);
>> +
>> + return ret;
>> +}
>> +
>> +static void pnv_ioda1_tce_free(struct iommu_table *tbl, long index,
>> + long npages)
>> +{
>> + pnv_tce_free(tbl, index, npages);
>> +
>> + if (tbl->it_type & TCE_PCI_SWINV_FREE)
>> + pnv_pci_ioda1_tce_invalidate(tbl, index, npages, false);
>> +}
>> +
>> static struct iommu_table_ops pnv_ioda1_iommu_ops = {
>> - .set = pnv_tce_build,
>> - .clear = pnv_tce_free,
>> + .set = pnv_ioda1_tce_build,
>> + .clear = pnv_ioda1_tce_free,
>> .get = pnv_tce_get,
>> };
>>
>> -static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
>> - struct iommu_table *tbl,
>> - __be64 *startp, __be64 *endp, bool rm)
>> +static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl,
>> + unsigned long index, unsigned long npages, bool rm)
>> {
>> + struct pnv_ioda_pe *pe = container_of(tbl->it_table_group,
>> + struct pnv_ioda_pe, table_group);
>> unsigned long start, end, inc;
>> __be64 __iomem *invalidate = rm ?
>> (__be64 __iomem *)pe->tce_inval_reg_phys :
>> @@ -1734,10 +1760,8 @@ static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
>> end = start;
>>
>> /* Figure out the start, end and step */
>> - inc = tbl->it_offset + (((u64)startp - tbl->it_base) / sizeof(u64));
>> - start |= (inc << shift);
>> - inc = tbl->it_offset + (((u64)endp - tbl->it_base) / sizeof(u64));
>> - end |= (inc << shift);
>> + start |= (index << shift);
>> + end |= ((index + npages - 1) << shift);
>> inc = (0x1ull << shift);
>> mb();
>>
>> @@ -1750,22 +1774,32 @@ static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
>> }
>> }
>>
>> -void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
>> - __be64 *startp, __be64 *endp, bool rm)
>> +static int pnv_ioda2_tce_build(struct iommu_table *tbl, long index,
>> + long npages, unsigned long uaddr,
>> + enum dma_data_direction direction,
>> + struct dma_attrs *attrs)
>> {
>> - struct pnv_ioda_pe *pe = container_of(tbl->it_table_group,
>> - struct pnv_ioda_pe, table_group);
>> - struct pnv_phb *phb = pe->phb;
>> -
>> - if (phb->type == PNV_PHB_IODA1)
>> - pnv_pci_ioda1_tce_invalidate(pe, tbl, startp, endp, rm);
>> - else
>> - pnv_pci_ioda2_tce_invalidate(pe, tbl, startp, endp, rm);
>> + long ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
>> + attrs);
>> +
>> + if (!ret && (tbl->it_type & TCE_PCI_SWINV_CREATE))
>> + pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);
>> +
>> + return ret;
>> +}
>> +
>> +static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
>> + long npages)
>> +{
>> + pnv_tce_free(tbl, index, npages);
>> +
>> + if (tbl->it_type & TCE_PCI_SWINV_FREE)
>> + pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);
>> }
>>
>> static struct iommu_table_ops pnv_ioda2_iommu_ops = {
>> - .set = pnv_tce_build,
>> - .clear = pnv_tce_free,
>> + .set = pnv_ioda2_tce_build,
>> + .clear = pnv_ioda2_tce_free,
>> .get = pnv_tce_get,
>> };
>>
>> diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
>> index 4c3bbb1..84b4ea4 100644
>> --- a/arch/powerpc/platforms/powernv/pci.c
>> +++ b/arch/powerpc/platforms/powernv/pci.c
>> @@ -577,37 +577,28 @@ int pnv_tce_build(struct iommu_table *tbl, long index, long npages,
>> struct dma_attrs *attrs)
>> {
>> u64 proto_tce = iommu_direction_to_tce_perm(direction);
>> - __be64 *tcep, *tces;
>> + __be64 *tcep;
>> u64 rpn;
>>
>> - tces = tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
>> + tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
>> rpn = __pa(uaddr) >> tbl->it_page_shift;
>>
>> while (npages--)
>> *(tcep++) = cpu_to_be64(proto_tce |
>> (rpn++ << tbl->it_page_shift));
>>
>> - /* Some implementations won't cache invalid TCEs and thus may not
>> - * need that flush. We'll probably turn it_type into a bit mask
>> - * of flags if that becomes the case
>> - */
>> - if (tbl->it_type & TCE_PCI_SWINV_CREATE)
>> - pnv_pci_ioda_tce_invalidate(tbl, tces, tcep - 1, false);
>>
>> return 0;
>> }
>>
>> void pnv_tce_free(struct iommu_table *tbl, long index, long npages)
>> {
>> - __be64 *tcep, *tces;
>> + __be64 *tcep;
>>
>> - tces = tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
>> + tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
>>
>> while (npages--)
>> *(tcep++) = cpu_to_be64(0);
>> -
>> - if (tbl->it_type & TCE_PCI_SWINV_FREE)
>> - pnv_pci_ioda_tce_invalidate(tbl, tces, tcep - 1, false);
>> }
>>
>> unsigned long pnv_tce_get(struct iommu_table *tbl, long index)
>
--
Alexey
next prev parent reply other threads:[~2015-04-30 2:58 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-25 12:14 [PATCH kernel v9 00/32] powerpc/iommu/vfio: Enable Dynamic DMA windows Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 01/32] powerpc/iommu: Split iommu_free_table into 2 helpers Alexey Kardashevskiy
2015-04-29 2:03 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 02/32] Revert "powerpc/powernv: Allocate struct pnv_ioda_pe iommu_table dynamically" Alexey Kardashevskiy
2015-04-27 21:05 ` Alex Williamson
2015-04-29 2:05 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 03/32] vfio: powerpc/spapr: Move page pinning from arch code to VFIO IOMMU driver Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 04/32] vfio: powerpc/spapr: Check that IOMMU page is fully contained by system page Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 05/32] vfio: powerpc/spapr: Use it_page_size Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 06/32] vfio: powerpc/spapr: Move locked_vm accounting to helpers Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 07/32] vfio: powerpc/spapr: Disable DMA mappings on disabled container Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 08/32] vfio: powerpc/spapr: Moving pinning/unpinning to helpers Alexey Kardashevskiy
2015-04-29 2:14 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 09/32] vfio: powerpc/spapr: Rework groups attaching Alexey Kardashevskiy
2015-04-29 2:16 ` David Gibson
2015-04-30 2:29 ` Alexey Kardashevskiy
2015-04-30 4:05 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 10/32] powerpc/powernv: Do not set "read" flag if direction==DMA_NONE Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 11/32] powerpc/iommu: Move tce_xxx callbacks from ppc_md to iommu_table Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 12/32] powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group Alexey Kardashevskiy
2015-04-29 2:49 ` David Gibson
2015-04-30 2:30 ` Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 13/32] vfio: powerpc/spapr/iommu/powernv/ioda2: Rework IOMMU ownership control Alexey Kardashevskiy
2015-04-29 3:02 ` David Gibson
2015-04-29 9:19 ` Alexey Kardashevskiy
2015-04-30 4:08 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 14/32] powerpc/iommu: Fix IOMMU ownership control functions Alexey Kardashevskiy
2015-04-29 3:08 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 15/32] powerpc/powernv/ioda/ioda2: Rework TCE invalidation in tce_build()/tce_free() Alexey Kardashevskiy
2015-04-29 3:18 ` David Gibson
2015-04-30 2:58 ` Alexey Kardashevskiy [this message]
2015-04-30 4:16 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 16/32] powerpc/powernv/ioda: Move TCE kill register address to PE Alexey Kardashevskiy
2015-04-27 21:05 ` Alex Williamson
2015-04-29 3:25 ` David Gibson
2015-04-29 9:00 ` Alexey Kardashevskiy
2015-04-30 4:18 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 17/32] powerpc/powernv: Implement accessor to TCE entry Alexey Kardashevskiy
2015-04-29 4:04 ` David Gibson
2015-04-29 9:02 ` Alexey Kardashevskiy
2015-04-30 0:13 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 18/32] powerpc/iommu/powernv: Release replaced TCE Alexey Kardashevskiy
2015-04-29 4:18 ` David Gibson
2015-04-29 9:51 ` Alexey Kardashevskiy
2015-04-30 4:21 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 19/32] powerpc/powernv/ioda2: Rework iommu_table creation Alexey Kardashevskiy
2015-04-29 4:27 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 20/32] powerpc/powernv/ioda2: Introduce pnv_pci_create_table/pnv_pci_free_table Alexey Kardashevskiy
2015-04-29 4:39 ` David Gibson
2015-04-29 9:12 ` Alexey Kardashevskiy
2015-04-30 4:24 ` David Gibson
2015-05-01 10:13 ` Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 21/32] powerpc/powernv/ioda2: Introduce pnv_pci_ioda2_set_window Alexey Kardashevskiy
2015-04-29 4:45 ` David Gibson
2015-04-29 9:26 ` Alexey Kardashevskiy
2015-04-30 4:32 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 22/32] powerpc/powernv: Implement multilevel TCE tables Alexey Kardashevskiy
2015-04-29 5:04 ` David Gibson
2015-05-01 9:48 ` Alexey Kardashevskiy
2015-05-05 12:05 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 23/32] powerpc/powernv/ioda: Define and implement DMA table/window management callbacks Alexey Kardashevskiy
2015-04-29 5:30 ` David Gibson
2015-04-29 9:44 ` Alexey Kardashevskiy
2015-04-30 4:37 ` David Gibson
2015-04-30 9:56 ` Alexey Kardashevskiy
2015-05-01 3:36 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 24/32] powerpc/powernv/ioda2: Use new helpers to do proper cleanup on PE release Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 25/32] vfio: powerpc/spapr: powerpc/powernv/ioda2: Rework ownership Alexey Kardashevskiy
2015-04-29 5:39 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 26/32] powerpc/iommu: Add userspace view of TCE table Alexey Kardashevskiy
2015-04-29 6:31 ` David Gibson
2015-05-01 4:01 ` Alexey Kardashevskiy
2015-05-01 4:23 ` David Gibson
2015-05-01 7:12 ` Alexey Kardashevskiy
2015-05-05 12:02 ` David Gibson
2015-05-11 2:11 ` Alexey Kardashevskiy
2015-05-11 4:52 ` Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 27/32] powerpc/iommu/ioda2: Add get_table_size() to calculate the size of future table Alexey Kardashevskiy
2015-04-29 6:40 ` David Gibson
2015-05-01 4:10 ` Alexey Kardashevskiy
2015-05-01 5:12 ` David Gibson
2015-05-01 6:53 ` Alexey Kardashevskiy
2015-05-05 11:58 ` David Gibson
2015-05-11 2:24 ` Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 28/32] powerpc/mmu: Add userspace-to-physical addresses translation cache Alexey Kardashevskiy
2015-04-29 7:01 ` David Gibson
2015-05-01 11:26 ` Alexey Kardashevskiy
2015-05-05 12:12 ` David Gibson
2015-04-30 6:34 ` David Gibson
2015-04-30 8:25 ` Paul Mackerras
2015-05-01 3:39 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 29/32] vfio: powerpc/spapr: Register memory and define IOMMU v2 Alexey Kardashevskiy
2015-04-30 6:55 ` David Gibson
2015-05-01 4:35 ` Alexey Kardashevskiy
2015-05-01 5:23 ` David Gibson
2015-05-01 6:27 ` Alexey Kardashevskiy
2015-05-05 11:53 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 30/32] vfio: powerpc/spapr: Use 32bit DMA window properties from table_group Alexey Kardashevskiy
2015-04-27 22:18 ` Alex Williamson
2015-04-30 6:58 ` David Gibson
2015-04-25 12:14 ` [PATCH kernel v9 31/32] vfio: powerpc/spapr: Support multiple groups in one container if possible Alexey Kardashevskiy
2015-04-30 7:22 ` David Gibson
2015-04-30 9:33 ` Alexey Kardashevskiy
2015-05-01 0:46 ` Benjamin Herrenschmidt
2015-05-01 4:44 ` David Gibson
2015-05-01 4:33 ` David Gibson
2015-05-01 6:05 ` Alexey Kardashevskiy
2015-05-05 11:50 ` David Gibson
2015-05-11 2:26 ` Alexey Kardashevskiy
2015-04-25 12:14 ` [PATCH kernel v9 32/32] vfio: powerpc/spapr: Support Dynamic DMA windows Alexey Kardashevskiy
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