From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anup Patel Date: Tue, 25 Apr 2023 18:02:28 +0530 Subject: [PATCH 15/17] lib: utils/irqchip: Use scratch space to save per-HART PLIC pointer In-Reply-To: <20230425123230.3943447-1-apatel@ventanamicro.com> References: <20230425123230.3943447-1-apatel@ventanamicro.com> Message-ID: <20230425123230.3943447-16-apatel@ventanamicro.com> List-Id: To: opensbi@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 --- lib/utils/irqchip/fdt_irqchip_plic.c | 108 +++++++++++++++++++++------ 1 file changed, 86 insertions(+), 22 deletions(-) diff --git a/lib/utils/irqchip/fdt_irqchip_plic.c b/lib/utils/irqchip/fdt_irqchip_plic.c index 605f44a..eb1e412 100644 --- a/lib/utils/irqchip/fdt_irqchip_plic.c +++ b/lib/utils/irqchip/fdt_irqchip_plic.c @@ -12,54 +12,97 @@ #include #include #include -#include +#include #include #include #include -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) \ +({ \ + (void *)(*((ulong *)sbi_scratch_offset_ptr((__scratch), \ + plic_ptr_offset))); \ +}) + +#define plic_set_hart_data_ptr(__scratch, __imsic) \ +do { \ + *((ulong *)sbi_scratch_offset_ptr((__scratch), plic_ptr_offset))\ + = (ulong)(__imsic); \ +} while (0) + +static unsigned long plic_mcontext_offset; + +#define plic_get_hart_mcontext(__scratch) \ +({ \ + long __ret = \ + *((long *)sbi_scratch_offset_ptr((__scratch), plic_mcontext_offset));\ + (__ret - 1); \ +}) + +#define plic_set_hart_mcontext(__scratch, __mcontext) \ +do { \ + *((long *)sbi_scratch_offset_ptr((__scratch), plic_mcontext_offset))\ + = (long)(__mcontext + 1); \ +} while (0) + +static unsigned long plic_scontext_offset; + +#define plic_get_hart_scontext(__scratch) \ +({ \ + long __ret = \ + *((long *)sbi_scratch_offset_ptr((__scratch), plic_scontext_offset));\ + (__ret - 1); \ +}) + +#define plic_set_hart_scontext(__scratch, __scontext) \ +do { \ + *((long *)sbi_scratch_offset_ptr((__scratch), plic_scontext_offset))\ + = (long)(__scontext + 1); \ +} while (0) 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 +110,7 @@ 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 +134,17 @@ 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 +158,24 @@ 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_offset(sizeof(ulong)); + if (!plic_ptr_offset) + return SBI_ENOMEM; + } + + if (!plic_mcontext_offset) { + plic_mcontext_offset = sbi_scratch_alloc_offset(sizeof(long)); + if (!plic_mcontext_offset) + return SBI_ENOMEM; + } + + if (!plic_scontext_offset) { + plic_scontext_offset = sbi_scratch_alloc_offset(sizeof(long)); + if (!plic_scontext_offset) + return SBI_ENOMEM; + } + pd = sbi_zalloc(sizeof(*pd)); if (!pd) return SBI_ENOMEM; @@ -152,7 +215,8 @@ 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); } -- 2.34.1