On Wed, Jun 10, 2015 at 02:41:13PM +1000, Alexey Kardashevskiy wrote:
>On 06/04/2015 04:41 PM, Gavin Shan wrote:
>>Each PHB maintains an array helping to translate RID (Request
>>ID) to PE# with the assumption that PE# takes 8 bits, indicating
>>that we can't have more than 256 PEs. However, pci_dn->pe_number
>>already had 4-bytes for the PE#.
>>
>>The patch extends the PE# capacity so that each of them will be
>>4-bytes long. Then we can use IODA_INVALID_PE to check one entry
>>in phb->pe_rmap[] is valid or not.
>>
>>Signed-off-by: Gavin Shan <gws...@linux.vnet.ibm.com>
>>---
>>v5:
>> * Split from [PATCH v5 v4 06/21]
>>---
>> arch/powerpc/platforms/powernv/pci-ioda.c | 5 ++++-
>> arch/powerpc/platforms/powernv/pci.h | 5 ++---
>> 2 files changed, 6 insertions(+), 4 deletions(-)
>>
>>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
>>b/arch/powerpc/platforms/powernv/pci-ioda.c
>>index 2087c5c..d8b0ef5 100644
>>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>>@@ -840,7 +840,7 @@ static int pnv_ioda_deconfigure_pe(struct pnv_phb *phb,
>>struct pnv_ioda_pe *pe)
>>
>> /* Clear the reverse map */
>> for (rid = pe->rid; rid < rid_end; rid++)
>>- phb->ioda.pe_rmap[rid] = 0;
>>+ phb->ioda.pe_rmap[rid] = IODA_INVALID_PE;
>>
>> /* Release from all parents PELT-V */
>> while (parent) {
>>@@ -3303,6 +3303,9 @@ static void __init pnv_pci_init_ioda_phb(struct
>>device_node *np,
>> if (prop32)
>> phb->ioda.reserved_pe = be32_to_cpup(prop32);
>>
>>+ /* Invalidate RID to PE# mapping */
>>+ memset(phb->ioda.pe_rmap, 0xff, sizeof(phb->ioda.pe_rmap));
>
>
>Above you assign IODA_INVALID_PE in a loop and here you just do 0xff for the
>entire array. Have a loop here too and assign IODA_INVALID_PE to every entry:
>for (i = 0; i < ARRAY_SIZE(phb->ioda.pe_rmap); ++i)
> phb->ioda.pe_rmap[i] = IODA_INVALID_PE;
>
Yeah, will change accordingly.
>>+
>> /* Parse 64-bit MMIO range */
>> pnv_ioda_parse_m64_window(phb);
>>
>>diff --git a/arch/powerpc/platforms/powernv/pci.h
>>b/arch/powerpc/platforms/powernv/pci.h
>>index 94ef1df..590f778 100644
>>--- a/arch/powerpc/platforms/powernv/pci.h
>>+++ b/arch/powerpc/platforms/powernv/pci.h
>>@@ -175,11 +175,10 @@ struct pnv_phb {
>> struct list_head pe_list;
>> struct mutex pe_list_mutex;
>>
>>- /* Reverse map of PEs, will have to extend if
>>- * we are to support more than 256 PEs, indexed
>>+ /* Reverse map of PEs, indexed by
>> * bus { bus, devfn }
>> */
>>- unsigned char pe_rmap[0x10000];
>>+ int pe_rmap[0x10000];
>
>
>Most time most of the array will be empty and it is 256K per PHB... I
>understand we have quite a lot of RAM but still.
>
Indeed, I'll think about how to save memory here, but not in this
patchset.
>>
>> /* Number of 32-bit DMA segments */
>> unsigned long dma32_segcount;
>>
Thanks,
Gavin
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