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lib: utils/irqchip: Use scratch space to save per-HART PLIC pointer

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Instead of using a global array indexed by hartid, we should use
scratch space to save per-HART PLIC pointer and PLIC context numbers.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
This commit is contained in:
Anup Patel 2023-04-19 21:29:50 +05:30 • committed by Anup Patel
parent f0516beae0
commit b3594ac1d1
1 changed files with 66 additions and 22 deletions
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88
lib/utils/irqchip/fdt_irqchip_plic.c
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@ -12,54 +12,77 @@
#include <sbi/riscv_io.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_heap.h>
#include <sbi/sbi_hartmask.h>
#include <sbi/sbi_scratch.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/irqchip/fdt_irqchip.h>
#include <sbi_utils/irqchip/plic.h>
static struct plic_data *plic_hartid2data[SBI_HARTMASK_MAX_BITS];
static int plic_hartid2context[SBI_HARTMASK_MAX_BITS][2] = { { -1 } };
static unsigned long plic_ptr_offset;
#define plic_get_hart_data_ptr(__scratch) \
sbi_scratch_read_type((__scratch), void *, plic_ptr_offset)
#define plic_set_hart_data_ptr(__scratch, __plic) \
sbi_scratch_write_type((__scratch), void *, plic_ptr_offset, (__plic))
static unsigned long plic_mcontext_offset;
#define plic_get_hart_mcontext(__scratch) \
(sbi_scratch_read_type((__scratch), long, plic_mcontext_offset) - 1)
#define plic_set_hart_mcontext(__scratch, __mctx) \
sbi_scratch_write_type((__scratch), long, plic_mcontext_offset, (__mctx) + 1)
static unsigned long plic_scontext_offset;
#define plic_get_hart_scontext(__scratch) \
(sbi_scratch_read_type((__scratch), long, plic_scontext_offset) - 1)
#define plic_set_hart_scontext(__scratch, __sctx) \
sbi_scratch_write_type((__scratch), long, plic_scontext_offset, (__sctx) + 1)
void fdt_plic_priority_save(u8 *priority, u32 num)
{
struct plic_data *plic = plic_hartid2data[current_hartid()];
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
plic_priority_save(plic, priority, num);
plic_priority_save(plic_get_hart_data_ptr(scratch), priority, num);
}
void fdt_plic_priority_restore(const u8 *priority, u32 num)
{
struct plic_data *plic = plic_hartid2data[current_hartid()];
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
plic_priority_restore(plic, priority, num);
plic_priority_restore(plic_get_hart_data_ptr(scratch), priority, num);
}
void fdt_plic_context_save(bool smode, u32 *enable, u32 *threshold, u32 num)
{
u32 hartid = current_hartid();
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
plic_context_save(plic_hartid2data[hartid],
plic_hartid2context[hartid][smode],
plic_context_save(plic_get_hart_data_ptr(scratch),
smode ? plic_get_hart_scontext(scratch) :
plic_get_hart_mcontext(scratch),
enable, threshold, num);
}
void fdt_plic_context_restore(bool smode, const u32 *enable, u32 threshold,
u32 num)
{
u32 hartid = current_hartid();
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
plic_context_restore(plic_hartid2data[hartid],
plic_hartid2context[hartid][smode],
plic_context_restore(plic_get_hart_data_ptr(scratch),
smode ? plic_get_hart_scontext(scratch) :
plic_get_hart_mcontext(scratch),
enable, threshold, num);
}
static int irqchip_plic_warm_init(void)
{
u32 hartid = current_hartid();
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
return plic_warm_irqchip_init(plic_hartid2data[hartid],
plic_hartid2context[hartid][0],
plic_hartid2context[hartid][1]);
return plic_warm_irqchip_init(plic_get_hart_data_ptr(scratch),
plic_get_hart_mcontext(scratch),
plic_get_hart_scontext(scratch));
}
static int irqchip_plic_update_hartid_table(void *fdt, int nodeoff,
@ -67,6 +90,7 @@ static int irqchip_plic_update_hartid_table(void *fdt, int nodeoff,
{
const fdt32_t *val;
u32 phandle, hwirq, hartid;
struct sbi_scratch *scratch;
int i, err, count, cpu_offset, cpu_intc_offset;
val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &count);
@ -90,16 +114,17 @@ static int irqchip_plic_update_hartid_table(void *fdt, int nodeoff,
if (err)
continue;
if (SBI_HARTMASK_MAX_BITS <= hartid)
scratch = sbi_hartid_to_scratch(hartid);
if (!scratch)
continue;
plic_hartid2data[hartid] = pd;
plic_set_hart_data_ptr(scratch, pd);
switch (hwirq) {
case IRQ_M_EXT:
plic_hartid2context[hartid][0] = i / 2;
plic_set_hart_mcontext(scratch, i / 2);
break;
case IRQ_S_EXT:
plic_hartid2context[hartid][1] = i / 2;
plic_set_hart_scontext(scratch, i / 2);
break;
}
}
@ -113,6 +138,24 @@ static int irqchip_plic_cold_init(void *fdt, int nodeoff,
int rc;
struct plic_data *pd;
if (!plic_ptr_offset) {
plic_ptr_offset = sbi_scratch_alloc_type_offset(void *);
if (!plic_ptr_offset)
return SBI_ENOMEM;
}
if (!plic_mcontext_offset) {
plic_mcontext_offset = sbi_scratch_alloc_type_offset(long);
if (!plic_mcontext_offset)
return SBI_ENOMEM;
}
if (!plic_scontext_offset) {
plic_scontext_offset = sbi_scratch_alloc_type_offset(long);
if (!plic_scontext_offset)
return SBI_ENOMEM;
}
pd = sbi_zalloc(sizeof(*pd));
if (!pd)
return SBI_ENOMEM;
@ -150,7 +193,8 @@ static void thead_plic_plat_init(struct plic_data *pd)
void thead_plic_restore(void)
{
struct plic_data *plic = plic_hartid2data[current_hartid()];
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
struct plic_data *plic = plic_get_hart_data_ptr(scratch);
thead_plic_plat_init(plic);
}