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 <gws...@linux.vnet.ibm.com>
---
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.
}
+
+ region.start += segsize;
+ index++;
}
}
}
--
Alexey
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