On Wed, Apr 13, 2016 at 05:47:59PM +1000, Alexey Kardashevskiy wrote:
>On 02/17/2016 02:43 PM, Gavin Shan wrote:
>>This enables M64 window on P7IOC, which has been enabled on PHB3.
>>Different from PHB3 where 16 M64 BARs are supported and each of
>>them can be owned by one particular PE# exclusively or divided
>>evenly to 256 segments, every P7IOC PHB has 16 M64 BARs and each
>>of them are divided to 8 segments. So every P7IOC PHB supports
>>128 M64 segments in total. P7IOC has M64DT, which helps mapping
>>one particular M64 segment# to arbitrary PE#. PHB3 doesn't have
>>M64DT, indicating that one M64 segment can only be pinned to the
>>fixed PE#. In order to have same code to support M64 on P7IOC and
>>PHB3, we just provide 128 M64 segments on every P7IOC PHB and each
>>of them is pinned to the fixed PE# by bypassing the function of
>>M64DT. In turn, we just need different phb->init_m64() for P7IOC
>>and PHB3 to support M64.
>
>The comment is not quite correct - in addition to pnv_ioda1_init_m64(), you
>also need to hack pnv_ioda_pick_m64_pe().
>
Right, will talk about the changes to pnv_ioda_pick_m64_pe() in the
commit log of next revision.
>
>>
>>Signed-off-by: Gavin Shan <gws...@linux.vnet.ibm.com>
>>---
>> arch/powerpc/platforms/powernv/pci-ioda.c | 86
>> +++++++++++++++++++++++++++++--
>> arch/powerpc/platforms/powernv/pci.h | 3 ++
>> 2 files changed, 86 insertions(+), 3 deletions(-)
>>
>>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
>>b/arch/powerpc/platforms/powernv/pci-ioda.c
>>index 1dc663a..8488238 100644
>>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>>@@ -246,6 +246,64 @@ static void pnv_ioda_reserve_dev_m64_pe(struct pci_dev
>>*pdev,
>> }
>> }
>>
>>+static int pnv_ioda1_init_m64(struct pnv_phb *phb)
>>+{
>>+ struct resource *r;
>>+ int index;
>>+
>>+ /*
>>+ * There are 16 M64 BARs, each of which has 8 segments. So
>>+ * there are as many M64 segments as the maximum number of
>>+ * PEs, which is 128.
>>+ */
>>+ for (index = 0; index < PNV_IODA1_M64_NUM; index++) {
>>+ unsigned long base, segsz = phb->ioda.m64_segsize;
>>+ int64_t rc;
>>+
>>+ base = phb->ioda.m64_base +
>>+ index * PNV_IODA1_M64_SEGS * segsz;
>>+ rc = opal_pci_set_phb_mem_window(phb->opal_id,
>>+ OPAL_M64_WINDOW_TYPE, index, base, 0,
>>+ PNV_IODA1_M64_SEGS * segsz);
>>+ if (rc != OPAL_SUCCESS) {
>>+ pr_warn(" Error %lld setting M64 PHB#%d-BAR#%d\n",
>>+ rc, phb->hose->global_number, index);
>>+ goto fail;
>>+ }
>>+
>>+ rc = opal_pci_phb_mmio_enable(phb->opal_id,
>>+ OPAL_M64_WINDOW_TYPE, index,
>>+ OPAL_ENABLE_M64_SPLIT);
>>+ if (rc != OPAL_SUCCESS) {
>>+ pr_warn(" Error %lld enabling M64 PHB#%d-BAR#%d\n",
>>+ rc, phb->hose->global_number, index);
>>+ goto fail;
>>+ }
>>+ }
>>+
>>+ /*
>>+ * Exclude the segment used by the reserved PE, which
>>+ * is expected to be 0 or last supported PE#.
>>+ */
>>+ r = &phb->hose->mem_resources[1];
>>+ if (phb->ioda.reserved_pe_idx == 0)
>>+ r->start += phb->ioda.m64_segsize;
>>+ else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1))
>>+ r->end -= phb->ioda.m64_segsize;
>>+ else
>>+ pr_warn(" Cannot cut M64 segment for reserved PE#%d\n",
>>+ phb->ioda.reserved_pe_idx);
>>+
>>+ return 0;
>>+
>>+fail:
>>+ for ( ; index >= 0; index--)
>>+ opal_pci_phb_mmio_enable(phb->opal_id,
>>+ OPAL_M64_WINDOW_TYPE, index, OPAL_DISABLE_M64);
>>+
>>+ return -EIO;
>>+}
>>+
>> static void pnv_ioda_reserve_m64_pe(struct pci_bus *bus,
>> unsigned long *pe_bitmap,
>> bool all)
>>@@ -315,6 +373,26 @@ static int pnv_ioda_pick_m64_pe(struct pci_bus *bus,
>>bool all)
>> pe->master = master_pe;
>> list_add_tail(&pe->list, &master_pe->slaves);
>> }
>>+
>>+ /*
>>+ * P7IOC supports M64DT, which helps mapping M64 segment
>>+ * to one particular PE#. However, PHB3 has fixed mapping
>>+ * between M64 segment and PE#. In order to have same logic
>>+ * for P7IOC and PHB3, we enforce fixed mapping between M64
>>+ * segment and PE# on P7IOC.
>>+ */
>>+ if (phb->type == PNV_PHB_IODA1) {
>>+ int64_t rc;
>>+
>>+ rc = opal_pci_map_pe_mmio_window(phb->opal_id,
>>+ pe->pe_number, OPAL_M64_WINDOW_TYPE,
>>+ pe->pe_number / PNV_IODA1_M64_SEGS,
>>+ pe->pe_number % PNV_IODA1_M64_SEGS);
>>+ if (rc != OPAL_SUCCESS)
>>+ pr_warn("%s: Error %lld mapping M64 for
>>PHB#%d-PE#%d\n",
>>+ __func__, rc, phb->hose->global_number,
>>+ pe->pe_number);
>>+ }
>
>
>Cannot this go to pnv_ioda1_init_m64()? From the commit log I understood that
>this setup is supposed to be static so it can be done once. Or it is sort of
>enable/disable PE? Then make is a helper and call it ioda1_pe_enable() or
>something.
>
No, we cannot. This associates the M64 segments with the PE# and it can be
done in pnv_ioda1_init_m64() where PE# is unknown. I don't understand what
you meant by "sort of enable/disable PE". PE starts the jurney when PELTM
has the corresponding mapping and it doesn't depend on M64 mapping necessarily.
>
>> }
>>
>> kfree(pe_alloc);
>>@@ -329,8 +407,7 @@ static void __init pnv_ioda_parse_m64_window(struct
>>pnv_phb *phb)
>> const u32 *r;
>> u64 pci_addr;
>>
>>- /* FIXME: Support M64 for P7IOC */
>>- if (phb->type != PNV_PHB_IODA2) {
>>+ if (phb->type != PNV_PHB_IODA1 && phb->type != PNV_PHB_IODA2) {
>> pr_info(" Not support M64 window\n");
>> return;
>> }
>>@@ -364,7 +441,10 @@ static void __init pnv_ioda_parse_m64_window(struct
>>pnv_phb *phb)
>>
>> /* Use last M64 BAR to cover M64 window */
>> phb->ioda.m64_bar_idx = 15;
>>- phb->init_m64 = pnv_ioda2_init_m64;
>>+ if (phb->type == PNV_PHB_IODA1)
>>+ phb->init_m64 = pnv_ioda1_init_m64;
>>+ else
>>+ phb->init_m64 = pnv_ioda2_init_m64;
>> phb->reserve_m64_pe = pnv_ioda_reserve_m64_pe;
>> phb->pick_m64_pe = pnv_ioda_pick_m64_pe;
>> }
>>diff --git a/arch/powerpc/platforms/powernv/pci.h
>>b/arch/powerpc/platforms/powernv/pci.h
>>index 866a5ea..00539ff 100644
>>--- a/arch/powerpc/platforms/powernv/pci.h
>>+++ b/arch/powerpc/platforms/powernv/pci.h
>>@@ -82,6 +82,9 @@ struct pnv_ioda_pe {
>> struct list_head list;
>> };
>>
>>+#define PNV_IODA1_M64_NUM 16 /* Number of M64 BARs */
>>+#define PNV_IODA1_M64_SEGS 8 /* Segments per M64 BAR */
>>+
>
>Why here, not in the beginning of arch/powerpc/platforms/powernv/pci-ioda.c ?
>It exposes symbols but nothing is using them (except pci-ioda.c) and code
>browsing gets bit more inconvenient.
>
It would be personal taste: those macros is tied with the definition
of "struct pnv_ioda_pe" or "struct pnv_ioda_phb". On the other hand,
those macros have to be in the header file once we split pci-ioda.c
to multiple source files some day. However, I can move them to
pci-ioda.c if you really want see them there. Let me know anyway.
>
>> #define PNV_PHB_FLAG_EEH (1 << 0)
>>
>> struct pnv_phb {
>>
>
>
>--
>Alexey
>
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
