[PATCH 2/5] arm: msm: smd: use either package v3 or v4 not both

[Daniel Walker <dwalker@codeaurora.org>]

From: Daniel Walker <c_dwalke@quicinc.com>

This modifies SMD to use either the package v3 or package v4,
but not both. The current code tries to allocate as v4 on all
system which can produce a scary looking error message on boot up,

smem_find(16, 40): wrong size 16424
smd_alloc_channel() cid=02 size=08192 'SMD_RPCCALL'

With this error the code then falls back on the package v3 allocation
method. This method is inefficient because it causes a slow down
on some systems even when the allocation method can be determined
at compile time. It also causes a kernel size increase that effects
all system and is not needed.

This change corrects the allocation to use one method or the other
and not both.

Signed-off-by: Daniel Walker <c_dwalke@quicinc.com>
---
 arch/arm/mach-msm/Kconfig       |    4 +++
 arch/arm/mach-msm/smd.c         |   44 +-----------------------------
 arch/arm/mach-msm/smd_private.h |   58 +++++++++++++++++++++++++++++++++++++-
 3 files changed, 61 insertions(+), 45 deletions(-)

diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index b548e42..381e817 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig
@@ -7,6 +7,7 @@ choice
 config ARCH_MSM7X00A
 	bool "MSM7x00A / MSM7x01A"
 	select ARCH_MSM_ARM11
+	select MSM_SMD_PKG3
 	select CPU_V6
 
 config ARCH_QSD8X50
@@ -325,6 +326,9 @@ config MSM_SERIAL_DEBUGGER_CONSOLE
 	  Enables a console so that printk messages are displayed on
 	  the debugger serial port as the occur.
 
+config MSM_SMD_PKG3
+	bool
+
 config MSM_SMD
 	default y
 	bool "MSM Shared Memory Driver (SMD)"
diff --git a/arch/arm/mach-msm/smd.c b/arch/arm/mach-msm/smd.c
index 42b59c9..6237a6c 100644
--- a/arch/arm/mach-msm/smd.c
+++ b/arch/arm/mach-msm/smd.c
@@ -600,48 +600,6 @@ static int smd_packet_read(smd_channel_t *ch, void *data, int len)
 	return r;
 }
 
-static int smd_alloc_v2(struct smd_channel *ch)
-{
-	struct smd_shared_v2 *shared2;
-	void *buffer;
-	unsigned buffer_sz;
-
-	shared2 = smem_alloc(SMEM_SMD_BASE_ID + ch->n, sizeof(*shared2));
-	buffer = smem_item(SMEM_SMD_FIFO_BASE_ID + ch->n, &buffer_sz);
-
-	if (!buffer)
-		return -1;
-
-	/* buffer must be a power-of-two size */
-	if (buffer_sz & (buffer_sz - 1))
-		return -1;
-
-	buffer_sz /= 2;
-	ch->send = &shared2->ch0;
-	ch->recv = &shared2->ch1;
-	ch->send_data = buffer;
-	ch->recv_data = buffer + buffer_sz;
-	ch->fifo_size = buffer_sz;
-	return 0;
-}
-
-static int smd_alloc_v1(struct smd_channel *ch)
-{
-	struct smd_shared_v1 *shared1;
-	shared1 = smem_alloc(ID_SMD_CHANNELS + ch->n, sizeof(*shared1));
-	if (!shared1) {
-		pr_err("smd_alloc_channel() cid %d does not exist\n", ch->n);
-		return -1;
-	}
-	ch->send = &shared1->ch0;
-	ch->recv = &shared1->ch1;
-	ch->send_data = shared1->data0;
-	ch->recv_data = shared1->data1;
-	ch->fifo_size = SMD_BUF_SIZE;
-	return 0;
-}
-
-
 static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
 {
 	struct smd_channel *ch;
@@ -653,7 +611,7 @@ static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
 	}
 	ch->n = cid;
 
-	if (smd_alloc_v2(ch) && smd_alloc_v1(ch)) {
+	if (smd_alloc_channel_for_package_version(ch)) {
 		kfree(ch);
 		return -1;
 	}
diff --git a/arch/arm/mach-msm/smd_private.h b/arch/arm/mach-msm/smd_private.h
index 33a33f1..eb9c824 100644
--- a/arch/arm/mach-msm/smd_private.h
+++ b/arch/arm/mach-msm/smd_private.h
@@ -61,7 +61,7 @@ struct smem_shared {
 #define SMSM_V1_SIZE		(sizeof(unsigned) * 8)
 #define SMSM_V2_SIZE		(sizeof(unsigned) * 4)
 
-#ifndef CONFIG_ARCH_MSM_SCORPION
+#ifdef CONFIG_MSM_SMD_PKG3
 struct smsm_interrupt_info {
 	uint32_t interrupt_mask;
 	uint32_t pending_interrupts;
@@ -265,6 +265,7 @@ struct smd_half_channel {
 	unsigned head;
 } __attribute__(( aligned(4), packed ));
 
+/* Only used on SMD package v3 on msm7201a */
 struct smd_shared_v1 {
 	struct smd_half_channel ch0;
 	unsigned char data0[SMD_BUF_SIZE];
@@ -272,6 +273,7 @@ struct smd_shared_v1 {
 	unsigned char data1[SMD_BUF_SIZE];
 };
 
+/* Used on SMD package v4 */
 struct smd_shared_v2 {
 	struct smd_half_channel ch0;
 	struct smd_half_channel ch1;
@@ -330,4 +332,56 @@ uint32_t raw_smsm_get_state(enum smsm_state_item item);
 
 extern void msm_init_last_radio_log(struct module *);
 
-#endif
+#ifdef CONFIG_MSM_SMD_PKG3
+/*
+ * This allocator assumes an SMD Package v3 which only exists on
+ * MSM7x00 SoC's.
+ */
+static inline int smd_alloc_channel_for_package_version(struct smd_channel *ch)
+{
+	struct smd_shared_v1 *shared1;
+
+	shared1 = smem_alloc(ID_SMD_CHANNELS + ch->n, sizeof(*shared1));
+	if (!shared1) {
+		pr_err("smd_alloc_channel() cid %d does not exist\n", ch->n);
+		return -1;
+	}
+	ch->send = &shared1->ch0;
+	ch->recv = &shared1->ch1;
+	ch->send_data = shared1->data0;
+	ch->recv_data = shared1->data1;
+	ch->fifo_size = SMD_BUF_SIZE;
+	return 0;
+}
+#else
+/*
+ * This allocator assumes an SMD Package v4, the most common
+ * and the default.
+ */
+static inline int smd_alloc_channel_for_package_version(struct smd_channel *ch)
+{
+	struct smd_shared_v2 *shared2;
+	void *buffer;
+	unsigned buffer_sz;
+
+	shared2 = smem_alloc(SMEM_SMD_BASE_ID + ch->n, sizeof(*shared2));
+	buffer = smem_item(SMEM_SMD_FIFO_BASE_ID + ch->n, &buffer_sz);
+
+	if (!buffer)
+		return -1;
+
+	/* buffer must be a power-of-two size */
+	if (buffer_sz & (buffer_sz - 1))
+		return -1;
+
+	buffer_sz /= 2;
+	ch->send = &shared2->ch0;
+	ch->recv = &shared2->ch1;
+	ch->send_data = buffer;
+	ch->recv_data = buffer + buffer_sz;
+	ch->fifo_size = buffer_sz;
+	return 0;
+}
+#endif /* CONFIG_MSM_SMD_PKG3 */
+
+#endif /* CONFIG_ARCH_MSM7X00A */
-- 
1.6.2.3