phb3/phb4/p7ioc: Document supported TCE sizes in DT

Add a new property, "ibm,supported-tce-sizes", to advertise to Linux how big the available TCE sizes are. Each value is a bit shift, from smallest to largest. Signed-off-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
open-power · Feb 20, 2018 · 08b1929 · 08b1929
1 parent ac8a62b
commit 08b1929
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diff --git a/hw/p7ioc-phb.c b/hw/p7ioc-phb.c
@@ -2596,6 +2596,11 @@ static void p7ioc_pcie_add_node(struct p7ioc_phb *p)
 	tkill = reg[0] + PHB_TCE_KILL;
 	dt_add_property_cells(np, "ibm,opal-tce-kill",
 			      hi32(tkill), lo32(tkill));
+	dt_add_property_cells(np, "ibm,supported-tce-sizes",
+			      12, // 4K
+			      16, // 64K
+			      24, // 16M
+			      34); // 16G
 
 	/*
 	 * Linux may use this property to allocate the diag data buffer, which

diff --git a/hw/phb3.c b/hw/phb3.c
@@ -4469,6 +4469,11 @@ static void phb3_add_properties(struct phb3 *p)
 	tkill = reg + PHB_TCE_KILL;
 	dt_add_property_cells(np, "ibm,opal-tce-kill",
 			      hi32(tkill), lo32(tkill));
+	dt_add_property_cells(np, "ibm,supported-tce-sizes",
+			      12, // 4K
+			      16, // 64K
+			      24, // 16M
+			      28); // 256M
 
 	/*
 	 * Indicate to Linux that the architected IODA2 MSI EOI method

diff --git a/hw/phb4.c b/hw/phb4.c
@@ -4708,6 +4708,11 @@ static void phb4_add_properties(struct phb4 *p)
 	/* M64 ranges start at 1 as MBT0 is used for M32 */
 	dt_add_property_cells(np, "ibm,opal-available-m64-ranges",
 			      1, p->mbt_size - 1);
+	dt_add_property_cells(np, "ibm,supported-tce-sizes",
+			      12, // 4K
+			      16, // 64K
+			      21, // 2M
+			      30); // 1G
 
 	/* Tell Linux about alignment limits for segment splits.
 	 *