[PATCH RFC] platform: generic: How to add custom extensions for sbi_call?
Guo Ren
guoren at kernel.org
Thu Apr 29 02:54:07 BST 2021
@Anup Patel @Atish Patra @Alistair Francis
Could we add a fdt_vendor_ext_provider for generic? How do you think?
On Wed, Apr 28, 2021 at 9:55 PM <guoren at kernel.org> wrote:
>
> From: Guo Ren <guoren at linux.alibaba.com>
>
> Here is the sample of thead PMU sbi implementation, it could work
> with linux perf record:
>
> https://github.com/c-sky/csky-linux/blob/linux-5.10.4/drivers/perf/thead_c900_pmu.c
>
> It support perf record with hardware event.
>
> How to support this in platform/generic?
>
> Thx
>
> Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
> Cc: Anup Patel <anup.patel at wdc.com>
> ---
> platform/generic/platform.c | 159 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 159 insertions(+)
>
> diff --git a/platform/generic/platform.c b/platform/generic/platform.c
> index 7581556..52084dd 100644
> --- a/platform/generic/platform.c
> +++ b/platform/generic/platform.c
> @@ -206,7 +206,166 @@ static void generic_system_reset(u32 reset_type, u32 reset_reason)
> writew(0x5555, (void *)0x100000); // qemu poweroff
> }
>
> +#include <sbi/sbi_trap.h>
> +#define CSR_MCOUNTERWEN 0x7c9
> +static void sbi_thead_pmu_init(void)
> +{
> + unsigned long interrupts;
> +
> + interrupts = csr_read(CSR_MIDELEG) | (1 << 17);
> + csr_write(CSR_MIDELEG, interrupts);
> +
> + /* CSR_MCOUNTEREN has already been set in mstatus_init() */
> + csr_write(CSR_MCOUNTERWEN, 0xffffffff);
> + csr_write(CSR_MHPMEVENT3, 1);
> + csr_write(CSR_MHPMEVENT4, 2);
> + csr_write(CSR_MHPMEVENT5, 3);
> + csr_write(CSR_MHPMEVENT6, 4);
> + csr_write(CSR_MHPMEVENT7, 5);
> + csr_write(CSR_MHPMEVENT8, 6);
> + csr_write(CSR_MHPMEVENT9, 7);
> + csr_write(CSR_MHPMEVENT10, 8);
> + csr_write(CSR_MHPMEVENT11, 9);
> + csr_write(CSR_MHPMEVENT12, 10);
> + csr_write(CSR_MHPMEVENT13, 11);
> + csr_write(CSR_MHPMEVENT14, 12);
> + csr_write(CSR_MHPMEVENT15, 13);
> + csr_write(CSR_MHPMEVENT16, 14);
> + csr_write(CSR_MHPMEVENT17, 15);
> + csr_write(CSR_MHPMEVENT18, 16);
> + csr_write(CSR_MHPMEVENT19, 17);
> + csr_write(CSR_MHPMEVENT20, 18);
> + csr_write(CSR_MHPMEVENT21, 19);
> + csr_write(CSR_MHPMEVENT22, 20);
> + csr_write(CSR_MHPMEVENT23, 21);
> + csr_write(CSR_MHPMEVENT24, 22);
> + csr_write(CSR_MHPMEVENT25, 23);
> + csr_write(CSR_MHPMEVENT26, 24);
> + csr_write(CSR_MHPMEVENT27, 25);
> + csr_write(CSR_MHPMEVENT28, 26);
> +}
> +
> +static void sbi_thead_pmu_map(unsigned long idx, unsigned long event_id)
> +{
> + switch (idx) {
> + case 3:
> + csr_write(CSR_MHPMEVENT3, event_id);
> + break;
> + case 4:
> + csr_write(CSR_MHPMEVENT4, event_id);
> + break;
> + case 5:
> + csr_write(CSR_MHPMEVENT5, event_id);
> + break;
> + case 6:
> + csr_write(CSR_MHPMEVENT6, event_id);
> + break;
> + case 7:
> + csr_write(CSR_MHPMEVENT7, event_id);
> + break;
> + case 8:
> + csr_write(CSR_MHPMEVENT8, event_id);
> + break;
> + case 9:
> + csr_write(CSR_MHPMEVENT9, event_id);
> + break;
> + case 10:
> + csr_write(CSR_MHPMEVENT10, event_id);
> + break;
> + case 11:
> + csr_write(CSR_MHPMEVENT11, event_id);
> + break;
> + case 12:
> + csr_write(CSR_MHPMEVENT12, event_id);
> + break;
> + case 13:
> + csr_write(CSR_MHPMEVENT13, event_id);
> + break;
> + case 14:
> + csr_write(CSR_MHPMEVENT14, event_id);
> + break;
> + case 15:
> + csr_write(CSR_MHPMEVENT15, event_id);
> + break;
> + case 16:
> + csr_write(CSR_MHPMEVENT16, event_id);
> + break;
> + case 17:
> + csr_write(CSR_MHPMEVENT17, event_id);
> + break;
> + case 18:
> + csr_write(CSR_MHPMEVENT18, event_id);
> + break;
> + case 19:
> + csr_write(CSR_MHPMEVENT19, event_id);
> + break;
> + case 20:
> + csr_write(CSR_MHPMEVENT20, event_id);
> + break;
> + case 21:
> + csr_write(CSR_MHPMEVENT21, event_id);
> + break;
> + case 22:
> + csr_write(CSR_MHPMEVENT22, event_id);
> + break;
> + case 23:
> + csr_write(CSR_MHPMEVENT23, event_id);
> + break;
> + case 24:
> + csr_write(CSR_MHPMEVENT24, event_id);
> + break;
> + case 25:
> + csr_write(CSR_MHPMEVENT25, event_id);
> + break;
> + case 26:
> + csr_write(CSR_MHPMEVENT26, event_id);
> + break;
> + case 27:
> + csr_write(CSR_MHPMEVENT27, event_id);
> + break;
> + case 28:
> + csr_write(CSR_MHPMEVENT28, event_id);
> + break;
> + case 29:
> + csr_write(CSR_MHPMEVENT29, event_id);
> + break;
> + case 30:
> + csr_write(CSR_MHPMEVENT30, event_id);
> + break;
> + case 31:
> + csr_write(CSR_MHPMEVENT31, event_id);
> + break;
> + }
> +}
> +
> +static void sbi_thead_pmu_set(unsigned long type, unsigned long idx, unsigned long event_id)
> +{
> + switch (type) {
> + case 2:
> + sbi_thead_pmu_map(idx, event_id);
> + break;
> + default:
> + sbi_thead_pmu_init();
> + break;
> + }
> +}
> +
> +static int thead_vendor_ext_provider(long extid, long funcid,
> + const struct sbi_trap_regs *regs, unsigned long *out_value,
> + struct sbi_trap_info *out_trap)
> +{
> + switch (extid) {
> + case 0x09000001:
> + sbi_thead_pmu_set(regs->a0, regs->a1, regs->a2);
> + break;
> + default:
> + sbi_hart_hang();
> + }
> + return 0;
> +}
> +
> const struct sbi_platform_operations platform_ops = {
> + .vendor_ext_provider = thead_vendor_ext_provider,
> .early_init = generic_early_init,
> .final_init = generic_final_init,
> .early_exit = generic_early_exit,
> --
> 2.7.4
>
--
Best Regards
Guo Ren
ML: https://lore.kernel.org/linux-csky/
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