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lib: Add IPI extension in SBI

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This patch adds new IPI extension which replaces ipi related
v0.1 extensions. This also adds a new API for ipi sending as trap
handling is not necessary in v0.2 SBI IPI related extensions.

It also modifies the IPI sending code which now accepts hart mask as a value
instead of S-mode virtual address. Thus, the caller should set it to exact hart
mask value everytime.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2019-11-24 23:33:47 -08:00
committed by Anup Patel
parent 109266397a
commit 9777aeef41
5 changed files with 160 additions and 24 deletions
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32
lib/sbi/sbi_ipi.c
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@@ -11,13 +11,13 @@
#include <sbi/riscv_asm.h>
#include <sbi/riscv_atomic.h>
#include <sbi/riscv_barrier.h>
#include <sbi/sbi_bitops.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_tlb.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_unpriv.h>
static unsigned long ipi_data_off;
@@ -53,20 +53,34 @@ static int sbi_ipi_send(struct sbi_scratch *scratch, u32 hartid, u32 event,
return 0;
}
int sbi_ipi_send_many(struct sbi_scratch *scratch,
struct sbi_trap_info *uptrap,
ulong *pmask, u32 event, void *data)
/**
* As this this function only handlers scalar values of hart mask, it must be
* set to all online harts if the intention is to send IPIs to all the harts.
* If hmask is zero, no IPIs will be sent.
*/
int sbi_ipi_send_many(struct sbi_scratch *scratch, ulong hmask, ulong hbase,
u32 event, void *data)
{
ulong i, m;
ulong mask = sbi_hart_available_mask();
ulong tempmask;
u32 hartid = sbi_current_hartid();
unsigned long last_bit = __fls(mask);
if (pmask) {
mask &= sbi_load_ulong(pmask, scratch, uptrap);
if (uptrap->cause)
return SBI_ETRAP;
}
if (hbase > last_bit)
/* hart base is not available */
return SBI_EINVAL;
/**
* FIXME: This check is valid only ULONG size. This is oka for now as
* avaialble hart mask can support upto ULONG size only.
*/
tempmask = hmask << hbase;
tempmask = ~mask & tempmask;
if (tempmask)
/* at least one of the hart in hmask is not available */
return SBI_EINVAL;
mask &= (hmask << hbase);
/* Send IPIs to every other hart on the set */
for (i = 0, m = mask; m; i++, m >>= 1)
if ((m & 1UL) && (i != hartid))