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cxl: Export library to support IBM XSL

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This patch exports a in-kernel 'library' API which can be called by
other drivers to help interacting with an IBM XSL on a POWER9 system.

The XSL (Translation Service Layer) is a stripped down version of the
PSL (Power Service Layer) used in some cards such as the Mellanox CX5.
Like the PSL, it implements the CAIA architecture, but has a number
of differences, mostly in it's implementation dependent registers.

The XSL also uses a special DMA cxl mode, which uses a slightly
different init sequence for the CAPP and PHB.

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Lombard
2017-06-22 15:07:27 +02:00
committed by Michael Ellerman
parent 218ea31039
commit 3ced8d7300
9 changed files with 449 additions and 30 deletions
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16
drivers/misc/cxl/native.c
View File

@@ -586,17 +586,17 @@ err:
#define set_endian(sr) ((sr) &= ~(CXL_PSL_SR_An_LE))
#endif
static u64 calculate_sr(struct cxl_context *ctx)
u64 cxl_calculate_sr(bool master, bool kernel, bool real_mode, bool p9)
{
u64 sr = 0;
set_endian(sr);
if (ctx->master)
if (master)
sr |= CXL_PSL_SR_An_MP;
if (mfspr(SPRN_LPCR) & LPCR_TC)
sr |= CXL_PSL_SR_An_TC;
if (ctx->kernel) {
if (!ctx->real_mode)
if (kernel) {
if (!real_mode)
sr |= CXL_PSL_SR_An_R;
sr |= (mfmsr() & MSR_SF) | CXL_PSL_SR_An_HV;
} else {
@@ -608,7 +608,7 @@ static u64 calculate_sr(struct cxl_context *ctx)
if (!test_tsk_thread_flag(current, TIF_32BIT))
sr |= CXL_PSL_SR_An_SF;
}
if (cxl_is_power9()) {
if (p9) {
if (radix_enabled())
sr |= CXL_PSL_SR_An_XLAT_ror;
else
@@ -617,6 +617,12 @@ static u64 calculate_sr(struct cxl_context *ctx)
return sr;
}
static u64 calculate_sr(struct cxl_context *ctx)
{
return cxl_calculate_sr(ctx->master, ctx->kernel, ctx->real_mode,
cxl_is_power9());
}
static void update_ivtes_directed(struct cxl_context *ctx)
{
bool need_update = (ctx->status == STARTED);