cxl: Add support for POWER9 DD2

The PSL initialization sequence has been updated to DD2.
This patch adapts to the changes, retaining compatibility with DD1.
The patch includes some changes to DD1 fix-ups as well.

Tests performed on some of the old/new hardware.

The function is_page_fault(), for POWER9, lists the Translation Checkout
Responses where the page fault will be handled by copro_handle_mm_fault().
This list is too restrictive and not necessary.

This patches removes this restriction and all page faults, whatever the
reason, will be handled. In this case, the interruption is always
acknowledged.

The following features will be added soon:
- phb reset when switching to capi mode.
- cxllib update to support new functions.

Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>

Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 24 insertions, 23 deletions

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 3ba04f3..b4ce9ea 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -401,7 +401,8 @@ int cxl_calc_capp_routing(struct pci_dev *dev, u64 *chipid,
 	*capp_unit_id = get_capp_unit_id(np, *phb_index);
 	of_node_put(np);
 	if (!*capp_unit_id) {
-		pr_err("cxl: invalid capp unit id\n");
+		pr_err("cxl: invalid capp unit id (phb_index: %d)\n",
+		       *phb_index);
 		return -ENODEV;
 	}
 
@@ -475,37 +476,37 @@ static int init_implementation_adapter_regs_psl9(struct cxl *adapter,
 	psl_fircntl |= 0x1ULL; /* ce_thresh */
 	cxl_p1_write(adapter, CXL_PSL9_FIR_CNTL, psl_fircntl);
 
-	/* vccredits=0x1  pcklat=0x4 */
-	cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0000000000001810ULL);
-
-	/*
-	 * For debugging with trace arrays.
-	 * Configure RX trace 0 segmented mode.
-	 * Configure CT trace 0 segmented mode.
-	 * Configure LA0 trace 0 segmented mode.
-	 * Configure LA1 trace 0 segmented mode.
+	/* Setup the PSL to transmit packets on the PCIe before the
+	 * CAPP is enabled
 	 */
-	cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000000ULL);
-	cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000003ULL);
-	cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000005ULL);
-	cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000006ULL);
+	cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0001001000002A10ULL);
 
 	/*
 	 * A response to an ASB_Notify request is returned by the
 	 * system as an MMIO write to the address defined in
-	 * the PSL_TNR_ADDR register
+	 * the PSL_TNR_ADDR register.
+	 * keep the Reset Value: 0x00020000E0000000
 	 */
-	/* PSL_TNR_ADDR */
 
-	/* NORST */
-	cxl_p1_write(adapter, CXL_PSL9_DEBUG, 0x8000000000000000ULL);
+	/* Enable XSL rty limit */
+	cxl_p1_write(adapter, CXL_XSL9_DEF, 0x51F8000000000005ULL);
+
+	/* Change XSL_INV dummy read threshold */
+	cxl_p1_write(adapter, CXL_XSL9_INV, 0x0000040007FFC200ULL);
+
+	if (phb_index == 3) {
+		/* disable machines 31-47 and 20-27 for DMA */
+		cxl_p1_write(adapter, CXL_PSL9_APCDEDTYPE, 0x40000FF3FFFF0000ULL);
+	}
 
-	/* allocate the apc machines */
-	cxl_p1_write(adapter, CXL_PSL9_APCDEDTYPE, 0x40000003FFFF0000ULL);
+	/* Snoop machines */
+	cxl_p1_write(adapter, CXL_PSL9_APCDEDALLOC, 0x800F000200000000ULL);
 
-	/* Disable vc dd1 fix */
-	if (cxl_is_power9_dd1())
-		cxl_p1_write(adapter, CXL_PSL9_GP_CT, 0x0400000000000001ULL);
+	if (cxl_is_power9_dd1()) {
+		/* Disabling deadlock counter CAR */
+		cxl_p1_write(adapter, CXL_PSL9_GP_CT, 0x0020000000000001ULL);
+	} else
+		cxl_p1_write(adapter, CXL_PSL9_DEBUG, 0x4000000000000000ULL);
 
 	return 0;
 }