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ppc/pnv: reduce stack->stack_no usage 

'stack->stack_no' represents the order that a stack appears in its PEC.
Its primary use is in XSCOM address space calculation in
pnv_phb4_xscom_realize() when calculating the memory region offset.

This attribute is redundant with phb->phb_id, which is calculated via
pnv_phb4_pec_get_phb_id() using stack->stack_no information. It'll also
be awkward to assign it when dealing with PECs and PHBs only in a future
patch.

A new pnv_phb4_get_phb_stack_no() helper is introduced to eliminate most
of the stack->stack_no uses we have. The only use left after this patch
is during pnv_pec_stk_default_phb_realize() when calculating phb_id,
which will also handled in the next patches.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220114180719.52117-3-danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
staging
Daniel Henrique Barboza 2022-01-18 12:56:31 +01:00 committed by Cédric Le Goater
parent d2704eb3fd
commit 6f506c90c3
1 changed files with 34 additions and 12 deletions
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46
hw/pci-host/pnv_phb4.c
View File

@ -868,6 +868,28 @@ static uint64_t pnv_pec_stk_nest_xscom_read(void *opaque, hwaddr addr,
return phb->nest_regs[reg];
}
/*
* Return the 'stack_no' of a PHB4. 'stack_no' is the order
* the PHB4 occupies in the PEC. This is the reverse of what
* pnv_phb4_pec_get_phb_id() does.
*
* E.g. a phb with phb_id = 4 and pec->index = 1 (PEC1) will
* be the second phb (stack_no = 1) of the PEC.
*/
static int pnv_phb4_get_phb_stack_no(PnvPHB4 *phb)
{
PnvPhb4PecState *pec = phb->pec;
PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
int index = pec->index;
int stack_no = phb->phb_id;
while (index--) {
stack_no -= pecc->num_stacks[index];
}
return stack_no;
}
static void pnv_phb4_update_regions(PnvPHB4 *phb)
{
/* Unmap first always */
@ -894,10 +916,10 @@ static void pnv_phb4_update_regions(PnvPHB4 *phb)
static void pnv_pec_stk_update_map(PnvPHB4 *phb)
{
PnvPhb4PecStack *stack = phb->stack;
PnvPhb4PecState *pec = phb->pec;
MemoryRegion *sysmem = get_system_memory();
uint64_t bar_en = phb->nest_regs[PEC_NEST_STK_BAR_EN];
int stack_no = pnv_phb4_get_phb_stack_no(phb);
uint64_t bar, mask, size;
char name[64];
@ -937,7 +959,7 @@ static void pnv_pec_stk_update_map(PnvPHB4 *phb)
mask = phb->nest_regs[PEC_NEST_STK_MMIO_BAR0_MASK];
size = ((~mask) >> 8) + 1;
snprintf(name, sizeof(name), "pec-%d.%d-phb-%d-mmio0",
pec->chip_id, pec->index, stack->stack_no);
pec->chip_id, pec->index, stack_no);
memory_region_init(&phb->mmbar0, OBJECT(phb), name, size);
memory_region_add_subregion(sysmem, bar, &phb->mmbar0);
phb->mmio0_base = bar;
@ -949,7 +971,7 @@ static void pnv_pec_stk_update_map(PnvPHB4 *phb)
mask = phb->nest_regs[PEC_NEST_STK_MMIO_BAR1_MASK];
size = ((~mask) >> 8) + 1;
snprintf(name, sizeof(name), "pec-%d.%d-phb-%d-mmio1",
pec->chip_id, pec->index, stack->stack_no);
pec->chip_id, pec->index, stack_no);
memory_region_init(&phb->mmbar1, OBJECT(phb), name, size);
memory_region_add_subregion(sysmem, bar, &phb->mmbar1);
phb->mmio1_base = bar;
@ -960,7 +982,7 @@ static void pnv_pec_stk_update_map(PnvPHB4 *phb)
bar = phb->nest_regs[PEC_NEST_STK_PHB_REGS_BAR] >> 8;
size = PNV_PHB4_NUM_REGS << 3;
snprintf(name, sizeof(name), "pec-%d.%d-phb-%d",
pec->chip_id, pec->index, stack->stack_no);
pec->chip_id, pec->index, stack_no);
memory_region_init(&phb->phbbar, OBJECT(phb), name, size);
memory_region_add_subregion(sysmem, bar, &phb->phbbar);
}
@ -969,7 +991,7 @@ static void pnv_pec_stk_update_map(PnvPHB4 *phb)
bar = phb->nest_regs[PEC_NEST_STK_INT_BAR] >> 8;
size = PNV_PHB4_MAX_INTs << 16;
snprintf(name, sizeof(name), "pec-%d.%d-phb-%d-int",
phb->pec->chip_id, phb->pec->index, stack->stack_no);
phb->pec->chip_id, phb->pec->index, stack_no);
memory_region_init(&phb->intbar, OBJECT(phb), name, size);
memory_region_add_subregion(sysmem, bar, &phb->intbar);
}
@ -1458,9 +1480,9 @@ static AddressSpace *pnv_phb4_dma_iommu(PCIBus *bus, void *opaque, int devfn)
static void pnv_phb4_xscom_realize(PnvPHB4 *phb)
{
PnvPhb4PecStack *stack = phb->stack;
PnvPhb4PecState *pec = phb->pec;
PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
int stack_no = pnv_phb4_get_phb_stack_no(phb);
uint32_t pec_nest_base;
uint32_t pec_pci_base;
char name[64];
@ -1469,20 +1491,20 @@ static void pnv_phb4_xscom_realize(PnvPHB4 *phb)
/* Initialize the XSCOM regions for the stack registers */
snprintf(name, sizeof(name), "xscom-pec-%d.%d-nest-phb-%d",
pec->chip_id, pec->index, stack->stack_no);
pec->chip_id, pec->index, stack_no);
pnv_xscom_region_init(&phb->nest_regs_mr, OBJECT(phb),
&pnv_pec_stk_nest_xscom_ops, phb, name,
PHB4_PEC_NEST_STK_REGS_COUNT);
snprintf(name, sizeof(name), "xscom-pec-%d.%d-pci-phb-%d",
pec->chip_id, pec->index, stack->stack_no);
pec->chip_id, pec->index, stack_no);
pnv_xscom_region_init(&phb->pci_regs_mr, OBJECT(phb),
&pnv_pec_stk_pci_xscom_ops, phb, name,
PHB4_PEC_PCI_STK_REGS_COUNT);
/* PHB pass-through */
snprintf(name, sizeof(name), "xscom-pec-%d.%d-pci-phb-%d",
pec->chip_id, pec->index, stack->stack_no);
pec->chip_id, pec->index, stack_no);
pnv_xscom_region_init(&phb->phb_regs_mr, OBJECT(phb),
&pnv_phb4_xscom_ops, phb, name, 0x40);
@ -1491,14 +1513,14 @@ static void pnv_phb4_xscom_realize(PnvPHB4 *phb)
/* Populate the XSCOM address space. */
pnv_xscom_add_subregion(pec->chip,
pec_nest_base + 0x40 * (stack->stack_no + 1),
pec_nest_base + 0x40 * (stack_no + 1),
&phb->nest_regs_mr);
pnv_xscom_add_subregion(pec->chip,
pec_pci_base + 0x40 * (stack->stack_no + 1),
pec_pci_base + 0x40 * (stack_no + 1),
&phb->pci_regs_mr);
pnv_xscom_add_subregion(pec->chip,
pec_pci_base + PNV9_XSCOM_PEC_PCI_STK0 +
0x40 * stack->stack_no,
0x40 * stack_no,
&phb->phb_regs_mr);
}