[3/8] sparc: prom: use property "name" directly to construct node names

Message ID 20181107223151.14991-4-robh@kernel.org
State New
Headers show
Series
  • sparc: OF name and device_type rework
Related show

Commit Message

Rob Herring Nov. 7, 2018, 10:31 p.m.
In preparation to remove direct accesses to the device_node.name
pointer, retrieve the node name from the "name" property instead.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

---
 arch/sparc/kernel/prom_32.c | 20 ++++++++++------
 arch/sparc/kernel/prom_64.c | 47 +++++++++++++++++++++++--------------
 2 files changed, 42 insertions(+), 25 deletions(-)

-- 
2.19.1

Comments

David Miller Nov. 9, 2018, 3:13 a.m. | #1
From: Rob Herring <robh@kernel.org>

Date: Wed,  7 Nov 2018 16:31:46 -0600

> In preparation to remove direct accesses to the device_node.name

> pointer, retrieve the node name from the "name" property instead.

> 

> Cc: "David S. Miller" <davem@davemloft.net>

> Cc: sparclinux@vger.kernel.org

> Signed-off-by: Rob Herring <robh@kernel.org>


On some 32-bit sparcs, the OF runs in non-cached memory.

Sucking in the OF device tree take a signficant amount of the
boot time on such systems.

And these changes are going to make it even slower.

Please just put a wrapper around dp->name or whatever and use that,
instead of making more get property OF calls which can be very
expensive.
Rob Herring Nov. 9, 2018, 1:02 p.m. | #2
On Thu, Nov 8, 2018 at 9:13 PM David Miller <davem@davemloft.net> wrote:
>

> From: Rob Herring <robh@kernel.org>

> Date: Wed,  7 Nov 2018 16:31:46 -0600

>

> > In preparation to remove direct accesses to the device_node.name

> > pointer, retrieve the node name from the "name" property instead.

> >

> > Cc: "David S. Miller" <davem@davemloft.net>

> > Cc: sparclinux@vger.kernel.org

> > Signed-off-by: Rob Herring <robh@kernel.org>

>

> On some 32-bit sparcs, the OF runs in non-cached memory.

>

> Sucking in the OF device tree take a signficant amount of the

> boot time on such systems.

>

> And these changes are going to make it even slower.

>

> Please just put a wrapper around dp->name or whatever and use that,

> instead of making more get property OF calls which can be very

> expensive.


It's not making calls into OF. It is retrieving the property from the
kernel's copy of the DT (allocated by memblock). So the only
difference is we have to walk the struct property list to find "name".
That's perhaps offset by the fact that we'll be doing one less
property retrieval from OF when this is all done. Right now, we
retrieve "name" from OF twice per node.

Rob
David Miller Nov. 10, 2018, 12:32 a.m. | #3
From: Rob Herring <robh@kernel.org>

Date: Fri, 9 Nov 2018 07:02:46 -0600

> On Thu, Nov 8, 2018 at 9:13 PM David Miller <davem@davemloft.net> wrote:

>>

>> From: Rob Herring <robh@kernel.org>

>> Date: Wed,  7 Nov 2018 16:31:46 -0600

>>

>> > In preparation to remove direct accesses to the device_node.name

>> > pointer, retrieve the node name from the "name" property instead.

>> >

>> > Cc: "David S. Miller" <davem@davemloft.net>

>> > Cc: sparclinux@vger.kernel.org

>> > Signed-off-by: Rob Herring <robh@kernel.org>

>>

>> On some 32-bit sparcs, the OF runs in non-cached memory.

>>

>> Sucking in the OF device tree take a signficant amount of the

>> boot time on such systems.

>>

>> And these changes are going to make it even slower.

>>

>> Please just put a wrapper around dp->name or whatever and use that,

>> instead of making more get property OF calls which can be very

>> expensive.

> 

> It's not making calls into OF. It is retrieving the property from the

> kernel's copy of the DT (allocated by memblock). So the only

> difference is we have to walk the struct property list to find "name".

> That's perhaps offset by the fact that we'll be doing one less

> property retrieval from OF when this is all done. Right now, we

> retrieve "name" from OF twice per node.


Ok, now I understand, thanks.

Patch

diff --git a/arch/sparc/kernel/prom_32.c b/arch/sparc/kernel/prom_32.c
index d41e2a749c5d..30e33b461970 100644
--- a/arch/sparc/kernel/prom_32.c
+++ b/arch/sparc/kernel/prom_32.c
@@ -60,6 +60,7 @@  void * __init prom_early_alloc(unsigned long size)
  */
 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom_registers *regs;
 	struct property *rprop;
 
@@ -69,13 +70,14 @@  static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
 
 	regs = rprop->value;
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name,
+		name,
 		regs->which_io, regs->phys_addr);
 }
 
 /* "name@slot,offset"  */
 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom_registers *regs;
 	struct property *prop;
 
@@ -85,7 +87,7 @@  static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 
 	regs = prop->value;
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name,
+		name,
 		regs->which_io,
 		regs->phys_addr);
 }
@@ -93,6 +95,7 @@  static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@devnum[,func]" */
 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom_pci_registers *regs;
 	struct property *prop;
 	unsigned int devfn;
@@ -105,12 +108,12 @@  static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 	devfn = (regs->phys_hi >> 8) & 0xff;
 	if (devfn & 0x07) {
 		sprintf(tmp_buf, "%s@%x,%x",
-			dp->name,
+			name,
 			devfn >> 3,
 			devfn & 0x07);
 	} else {
 		sprintf(tmp_buf, "%s@%x",
-			dp->name,
+			name,
 			devfn >> 3);
 	}
 }
@@ -118,6 +121,7 @@  static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@addrhi,addrlo" */
 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom_registers *regs;
 	struct property *prop;
 
@@ -128,13 +132,14 @@  static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 	regs = prop->value;
 
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name,
+		name,
 		regs->which_io, regs->phys_addr);
 }
 
 /* "name:vendor:device@irq,addrlo" */
 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct amba_prom_registers *regs;
 	unsigned int *intr, *device, *vendor, reg0;
 	struct property *prop;
@@ -168,7 +173,7 @@  static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 	device = prop->value;
 
 	sprintf(tmp_buf, "%s:%d:%d@%x,%x",
-		dp->name, *vendor, *device,
+		name, *vendor, *device,
 		*intr, reg0);
 }
 
@@ -196,12 +201,13 @@  static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 
 char * __init build_path_component(struct device_node *dp)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	char tmp_buf[64], *n;
 
 	tmp_buf[0] = '\0';
 	__build_path_component(dp, tmp_buf);
 	if (tmp_buf[0] == '\0')
-		strcpy(tmp_buf, dp->name);
+		strcpy(tmp_buf, name);
 
 	n = prom_early_alloc(strlen(tmp_buf) + 1);
 	strcpy(n, tmp_buf);
diff --git a/arch/sparc/kernel/prom_64.c b/arch/sparc/kernel/prom_64.c
index c37955d127fe..1667df573f6f 100644
--- a/arch/sparc/kernel/prom_64.c
+++ b/arch/sparc/kernel/prom_64.c
@@ -72,6 +72,7 @@  void * __init prom_early_alloc(unsigned long size)
  */
 static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom64_registers *regs;
 	struct property *rprop;
 	u32 high_bits, low_bits, type;
@@ -83,7 +84,7 @@  static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
 	regs = rprop->value;
 	if (!of_node_is_root(dp->parent)) {
 		sprintf(tmp_buf, "%s@%x,%x",
-			dp->name,
+			name,
 			(unsigned int) (regs->phys_addr >> 32UL),
 			(unsigned int) (regs->phys_addr & 0xffffffffUL));
 		return;
@@ -98,21 +99,22 @@  static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
 
 		if (low_bits)
 			sprintf(tmp_buf, "%s@%s%x,%x",
-				dp->name, prefix,
+				name, prefix,
 				high_bits, low_bits);
 		else
 			sprintf(tmp_buf, "%s@%s%x",
-				dp->name,
+				name,
 				prefix,
 				high_bits);
 	} else if (type == 12) {
 		sprintf(tmp_buf, "%s@%x",
-			dp->name, high_bits);
+			name, high_bits);
 	}
 }
 
 static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom64_registers *regs;
 	struct property *prop;
 
@@ -123,7 +125,7 @@  static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 	regs = prop->value;
 	if (!of_node_is_root(dp->parent)) {
 		sprintf(tmp_buf, "%s@%x,%x",
-			dp->name,
+			name,
 			(unsigned int) (regs->phys_addr >> 32UL),
 			(unsigned int) (regs->phys_addr & 0xffffffffUL));
 		return;
@@ -139,7 +141,7 @@  static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 			mask = 0x7fffff;
 
 		sprintf(tmp_buf, "%s@%x,%x",
-			dp->name,
+			name,
 			*(u32 *)prop->value,
 			(unsigned int) (regs->phys_addr & mask));
 	}
@@ -148,6 +150,7 @@  static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@slot,offset"  */
 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom_registers *regs;
 	struct property *prop;
 
@@ -157,7 +160,7 @@  static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 
 	regs = prop->value;
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name,
+		name,
 		regs->which_io,
 		regs->phys_addr);
 }
@@ -165,6 +168,7 @@  static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@devnum[,func]" */
 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom_pci_registers *regs;
 	struct property *prop;
 	unsigned int devfn;
@@ -177,12 +181,12 @@  static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 	devfn = (regs->phys_hi >> 8) & 0xff;
 	if (devfn & 0x07) {
 		sprintf(tmp_buf, "%s@%x,%x",
-			dp->name,
+			name,
 			devfn >> 3,
 			devfn & 0x07);
 	} else {
 		sprintf(tmp_buf, "%s@%x",
-			dp->name,
+			name,
 			devfn >> 3);
 	}
 }
@@ -190,6 +194,7 @@  static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@UPA_PORTID,offset" */
 static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom64_registers *regs;
 	struct property *prop;
 
@@ -204,7 +209,7 @@  static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
 		return;
 
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name,
+		name,
 		*(u32 *) prop->value,
 		(unsigned int) (regs->phys_addr & 0xffffffffUL));
 }
@@ -212,6 +217,7 @@  static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@reg" */
 static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct property *prop;
 	u32 *regs;
 
@@ -221,12 +227,13 @@  static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
 
 	regs = prop->value;
 
-	sprintf(tmp_buf, "%s@%x", dp->name, *regs);
+	sprintf(tmp_buf, "%s@%x", name, *regs);
 }
 
 /* "name@addrhi,addrlo" */
 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct linux_prom64_registers *regs;
 	struct property *prop;
 
@@ -237,7 +244,7 @@  static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 	regs = prop->value;
 
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name,
+		name,
 		(unsigned int) (regs->phys_addr >> 32UL),
 		(unsigned int) (regs->phys_addr & 0xffffffffUL));
 }
@@ -245,6 +252,7 @@  static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 /* "name@bus,addr" */
 static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct property *prop;
 	u32 *regs;
 
@@ -258,12 +266,13 @@  static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
 	 * property of the i2c bus node etc. etc.
 	 */
 	sprintf(tmp_buf, "%s@%x,%x",
-		dp->name, regs[0], regs[1]);
+		name, regs[0], regs[1]);
 }
 
 /* "name@reg0[,reg1]" */
 static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct property *prop;
 	u32 *regs;
 
@@ -275,16 +284,17 @@  static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
 
 	if (prop->length == sizeof(u32) || regs[1] == 1) {
 		sprintf(tmp_buf, "%s@%x",
-			dp->name, regs[0]);
+			name, regs[0]);
 	} else {
 		sprintf(tmp_buf, "%s@%x,%x",
-			dp->name, regs[0], regs[1]);
+			name, regs[0], regs[1]);
 	}
 }
 
 /* "name@reg0reg1[,reg2reg3]" */
 static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	struct property *prop;
 	u32 *regs;
 
@@ -296,10 +306,10 @@  static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf
 
 	if (regs[2] || regs[3]) {
 		sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
-			dp->name, regs[0], regs[1], regs[2], regs[3]);
+			name, regs[0], regs[1], regs[2], regs[3]);
 	} else {
 		sprintf(tmp_buf, "%s@%08x%08x",
-			dp->name, regs[0], regs[1]);
+			name, regs[0], regs[1]);
 	}
 }
 
@@ -356,12 +366,13 @@  static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 
 char * __init build_path_component(struct device_node *dp)
 {
+	const char *name = of_get_property(dp, "name", NULL);
 	char tmp_buf[64], *n;
 
 	tmp_buf[0] = '\0';
 	__build_path_component(dp, tmp_buf);
 	if (tmp_buf[0] == '\0')
-		strcpy(tmp_buf, dp->name);
+		strcpy(tmp_buf, name);
 
 	n = prom_early_alloc(strlen(tmp_buf) + 1);
 	strcpy(n, tmp_buf);