On Wed, Apr 13, 2016 at 04:45:39PM +1000, Alexey Kardashevskiy wrote:
>On 02/17/2016 02:43 PM, Gavin Shan wrote:
>>The original implementation of pnv_ioda_setup_pe_seg() configures
>>IO and M32 segments by separate logics, which can be merged by
>>by caching @segmap, @seg_size, @win in advance. This shouldn't
>>cause any behavioural changes.
>>
>>Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
>>---
>> arch/powerpc/platforms/powernv/pci-ioda.c | 62 ++++++++++++++-----------------
>> 1 file changed, 28 insertions(+), 34 deletions(-)
>>
>>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>>index 44cc5f3..fd7d382 100644
>>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>>@@ -2940,8 +2940,10 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
>> struct pnv_phb *phb = hose->private_data;
>> struct pci_bus_region region;
>> struct resource *res;
>>- int i, index;
>>- int rc;
>>+ unsigned int segsize;
>>+ int *segmap, index, i;
>>+ uint16_t win;
>>+ int64_t rc;
>>
>> /*
>> * NOTE: We only care PCI bus based PE for now. For PCI
>>@@ -2958,23 +2960,9 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
>> if (res->flags & IORESOURCE_IO) {
>> region.start = res->start - phb->ioda.io_pci_base;
>> region.end = res->end - phb->ioda.io_pci_base;
>>- index = region.start / phb->ioda.io_segsize;
>>-
>>- while (index < phb->ioda.total_pe_num &&
>>- region.start <= region.end) {
>>- phb->ioda.io_segmap[index] = pe->pe_number;
>>- rc = opal_pci_map_pe_mmio_window(phb->opal_id,
>>- pe->pe_number, OPAL_IO_WINDOW_TYPE, 0, index);
>>- if (rc != OPAL_SUCCESS) {
>>- pr_err("%s: OPAL error %d when mapping IO "
>>- "segment #%d to PE#%d\n",
>>- __func__, rc, index, pe->pe_number);
>>- break;
>>- }
>>-
>>- region.start += phb->ioda.io_segsize;
>>- index++;
>>- }
>>+ segsize = phb->ioda.io_segsize;
>>+ segmap = phb->ioda.io_segmap;
>>+ win = OPAL_IO_WINDOW_TYPE;
>> } else if ((res->flags & IORESOURCE_MEM) &&
>> !pnv_pci_is_mem_pref_64(res->flags)) {
>> region.start = res->start -
>>@@ -2983,23 +2971,29 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
>> region.end = res->end -
>> hose->mem_offset[0] -
>> phb->ioda.m32_pci_base;
>>- index = region.start / phb->ioda.m32_segsize;
>>-
>>- while (index < phb->ioda.total_pe_num &&
>>- region.start <= region.end) {
>>- phb->ioda.m32_segmap[index] = pe->pe_number;
>>- rc = opal_pci_map_pe_mmio_window(phb->opal_id,
>>- pe->pe_number, OPAL_M32_WINDOW_TYPE, 0, index);
>>- if (rc != OPAL_SUCCESS) {
>>- pr_err("%s: OPAL error %d when mapping M32 "
>>- "segment#%d to PE#%d",
>>- __func__, rc, index, pe->pe_number);
>>- break;
>>- }
>>+ segsize = phb->ioda.m32_segsize;
>>+ segmap = phb->ioda.m32_segmap;
>>+ win = OPAL_M32_WINDOW_TYPE;
>>+ } else {
>>+ continue;
>>+ }
>>
>>- region.start += phb->ioda.m32_segsize;
>>- index++;
>>+ index = region.start / segsize;
>>+ while (index < phb->ioda.total_pe_num &&
>>+ region.start <= region.end) {
>>+ segmap[index] = pe->pe_number;
>>+ rc = opal_pci_map_pe_mmio_window(phb->opal_id,
>>+ pe->pe_number, win, 0, index);
>>+ if (rc != OPAL_SUCCESS) {
>>+ pr_warn("%s: Error %lld mapping (%d) seg#%d to PHB#%d-PE#%d\n",
>>+ __func__, rc, win, index,
>>+ pe->phb->hose->global_number,
>>+ pe->pe_number);
>>+ break;
>
>Please move this loop to a helper and stop caching segsize/segmap/win; this
>will make the code easier to read and the next patch will look much cleaner
>as it will not have to move this exact loop.
>
Thanks. It's good idea and I'll change the code accordingly in next revision.
>> }
>>+
>>+ region.start += segsize;
>>+ index++;
>> }
>> }
>> }
>>
>
>
>--
>Alexey
>
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