Commit 5100a9d6 authored by Ian Munsie's avatar Ian Munsie Committed by Michael Ellerman
Browse files

cxl: Disable secondary hash in segment table 



This patch simplifies the process of finding a free segment table entry
by disabling the secondary hash. This reduces the number of possible
entries in the segment table for a given address from 16 to 8.

Due to the large segment sizes we use it is extremely unlikely that the
secondary hash would ever have been used in practice, so this should not
have any negative impacts and may even improve performance due to the
reduced number of comparisons that software & hardware need to perform.

This patch clears the SC bit in the hardware's state register
(CXL_PSL_SR_An) to disable the secondary hash in the hardware since we
can no longer fill out entries using it.

Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Reviewed-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent bf19edd2

drivers/misc/cxl/fault.c

+8 −22
Original line number Diff line number Diff line
@@ -22,29 +22,19 @@ 
#include "cxl.h"



static struct cxl_sste* find_free_sste(struct cxl_sste *primary_group,

				       bool sec_hash,

				       struct cxl_sste *secondary_group,

				       unsigned int *lru)

{

	unsigned int i, entry;

	unsigned int entry;

	struct cxl_sste *sste, *group = primary_group;



	for (i = 0; i < 2; i++) {

	for (entry = 0; entry < 8; entry++) {

		sste = group + entry;

		if (!(be64_to_cpu(sste->esid_data) & SLB_ESID_V))

			return sste;

	}

		if (!sec_hash)

			break;

		group = secondary_group;

	}

	/* Nothing free, select an entry to cast out */

	if (sec_hash && (*lru & 0x8))

		sste = secondary_group + (*lru & 0x7);

	else

		sste = primary_group + (*lru & 0x7);

	*lru = (*lru + 1) & 0xf;

	sste = primary_group + *lru;

	*lru = (*lru + 1) & 0x7;



	return sste;

}
@@ -53,22 +43,18 @@ static void cxl_load_segment(struct cxl_context *ctx, struct copro_slb *slb) 
{

	/* mask is the group index, we search primary and secondary here. */

	unsigned int mask = (ctx->sst_size >> 7)-1; /* SSTP0[SegTableSize] */

	bool sec_hash = 1;

	struct cxl_sste *sste;

	unsigned int hash;

	unsigned long flags;





	sec_hash = !!(cxl_p1n_read(ctx->afu, CXL_PSL_SR_An) & CXL_PSL_SR_An_SC);



	if (slb->vsid & SLB_VSID_B_1T)

		hash = (slb->esid >> SID_SHIFT_1T) & mask;

	else /* 256M */

		hash = (slb->esid >> SID_SHIFT) & mask;



	spin_lock_irqsave(&ctx->sste_lock, flags);

	sste = find_free_sste(ctx->sstp + (hash << 3), sec_hash,

			      ctx->sstp + ((~hash & mask) << 3), &ctx->sst_lru);

	sste = find_free_sste(ctx->sstp + (hash << 3), &ctx->sst_lru);



	pr_devel("CXL Populating SST[%li]: %#llx %#llx\n",

			sste - ctx->sstp, slb->vsid, slb->esid);

drivers/misc/cxl/native.c

+2 −2
Original line number Diff line number Diff line
@@ -417,7 +417,7 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr) 
	ctx->elem->haurp = 0; /* disable */

	ctx->elem->sdr = cpu_to_be64(mfspr(SPRN_SDR1));



	sr = CXL_PSL_SR_An_SC;

	sr = 0;

	if (ctx->master)

		sr |= CXL_PSL_SR_An_MP;

	if (mfspr(SPRN_LPCR) & LPCR_TC)
@@ -508,7 +508,7 @@ static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr) 
	u64 sr;

	int rc;



	sr = CXL_PSL_SR_An_SC;

	sr = 0;

	set_endian(sr);

	if (ctx->master)

		sr |= CXL_PSL_SR_An_MP;

CRA Git | Maintained and supported by SUSTech CRA and CCSE