[PATCH v11 3/6] CPM/QE: use genalloc to manage CPM/QE muram

From: Zhao Qiang
Date: Mon Sep 28 2015 - 22:15:53 EST

Use genalloc to manage CPM/QE muram instead of rheap.

Signed-off-by: Zhao Qiang <qiang.zhao@xxxxxxxxxxxxx>
---
Changes for v9:
- splitted from patch 3/5, modify cpm muram management functions.
Changes for v10:
- modify cpm muram first, then move to qe_common
- modify commit.
Changes for v11:
- factor out the common alloc code
- modify min_alloc_order to zero for cpm_muram_alloc_fixed.

arch/powerpc/include/asm/cpm.h | 1 +
arch/powerpc/platforms/Kconfig | 1 +
arch/powerpc/sysdev/cpm_common.c | 129 +++++++++++++++++++++++++++------------
3 files changed, 93 insertions(+), 38 deletions(-)

diff --git a/arch/powerpc/include/asm/cpm.h b/arch/powerpc/include/asm/cpm.h
index 4398a6c..0e1ac3f 100644
--- a/arch/powerpc/include/asm/cpm.h
+++ b/arch/powerpc/include/asm/cpm.h
@@ -161,6 +161,7 @@ int cpm_muram_init(void);
unsigned long cpm_muram_alloc(unsigned long size, unsigned long align);
int cpm_muram_free(unsigned long offset);
unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size);
+unsigned long cpm_muram_alloc_common(unsigned long size, void *data);
void __iomem *cpm_muram_addr(unsigned long offset);
unsigned long cpm_muram_offset(void __iomem *addr);
dma_addr_t cpm_muram_dma(void __iomem *addr);
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index b7f9c40..01f98a2 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -276,6 +276,7 @@ config QUICC_ENGINE
bool "Freescale QUICC Engine (QE) Support"
depends on FSL_SOC && PPC32
select PPC_LIB_RHEAP
+ select GENERIC_ALLOCATOR
select CRC32
help
The QUICC Engine (QE) is a new generation of communications
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
index 4f78695..ff47072 100644
--- a/arch/powerpc/sysdev/cpm_common.c
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -17,6 +17,7 @@
* published by the Free Software Foundation.
*/

+#include <linux/genalloc.h>
#include <linux/init.h>
#include <linux/of_device.h>
#include <linux/spinlock.h>
@@ -27,7 +28,6 @@

#include <asm/udbg.h>
#include <asm/io.h>
-#include <asm/rheap.h>
#include <asm/cpm.h>

#include <mm/mmu_decl.h>
@@ -65,14 +65,22 @@ void __init udbg_init_cpm(void)
}
#endif

+static struct gen_pool *muram_pool;
static spinlock_t cpm_muram_lock;
-static rh_block_t cpm_boot_muram_rh_block[16];
-static rh_info_t cpm_muram_info;
static u8 __iomem *muram_vbase;
static phys_addr_t muram_pbase;

-/* Max address size we deal with */
+struct muram_block {
+ struct list_head head;
+ unsigned long start;
+ int size;
+};
+
+static LIST_HEAD(muram_block_list);
+
+/* max address size we deal with */
#define OF_MAX_ADDR_CELLS 4
+#define GENPOOL_OFFSET (4096 * 8)

int cpm_muram_init(void)
{
@@ -87,50 +95,52 @@ int cpm_muram_init(void)
return 0;

spin_lock_init(&cpm_muram_lock);
- /* initialize the info header */
- rh_init(&cpm_muram_info, 1,
- sizeof(cpm_boot_muram_rh_block) /
- sizeof(cpm_boot_muram_rh_block[0]),
- cpm_boot_muram_rh_block);
-
np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
if (!np) {
/* try legacy bindings */
np = of_find_node_by_name(NULL, "data-only");
if (!np) {
- printk(KERN_ERR "Cannot find CPM muram data node");
+ pr_err("Cannot find CPM muram data node");
ret = -ENODEV;
- goto out;
+ goto out_muram;
}
}

+ muram_pool = gen_pool_create(0, -1);
muram_pbase = of_translate_address(np, zero);
if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
- printk(KERN_ERR "Cannot translate zero through CPM muram node");
+ pr_err("Cannot translate zero through CPM muram node");
ret = -ENODEV;
- goto out;
+ goto out_pool;
}

while (of_address_to_resource(np, i++, &r) == 0) {
if (r.end > max)
max = r.end;
+ ret = gen_pool_add(muram_pool, r.start - muram_pbase +
+ GENPOOL_OFFSET, resource_size(&r), -1);
+ if (ret) {
+ pr_err("QE: couldn't add muram to pool!\n");
+ goto out_pool;
+ }

- rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
- resource_size(&r));
}

muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
if (!muram_vbase) {
- printk(KERN_ERR "Cannot map CPM muram");
+ pr_err("Cannot map QE muram");
ret = -ENOMEM;
+ goto out_pool;
}
-
-out:
+ goto out_muram;
+out_pool:
+ gen_pool_destroy(muram_pool);
+out_muram:
of_node_put(np);
return ret;
}

-/**
+/*
* cpm_muram_alloc - allocate the requested size worth of multi-user ram
* @size: number of bytes to allocate
* @align: requested alignment, in bytes
@@ -141,59 +151,102 @@ out:
*/
unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
{
- unsigned long start;
unsigned long flags;
-
+ unsigned long start;
+ static struct genpool_data_align muram_pool_data;
spin_lock_irqsave(&cpm_muram_lock, flags);
- cpm_muram_info.alignment = align;
- start = rh_alloc(&cpm_muram_info, size, "commproc");
- memset(cpm_muram_addr(start), 0, size);
+ muram_pool_data.align = align;
+ gen_pool_set_algo(muram_pool, gen_pool_first_fit_align,
+ &muram_pool_data);
+ start = cpm_muram_alloc_common(size, &muram_pool_data);
spin_unlock_irqrestore(&cpm_muram_lock, flags);
-
return start;
}
EXPORT_SYMBOL(cpm_muram_alloc);

+
/**
* cpm_muram_free - free a chunk of multi-user ram
* @offset: The beginning of the chunk as returned by cpm_muram_alloc().
*/
int cpm_muram_free(unsigned long offset)
{
- int ret;
unsigned long flags;
+ int size;
+ struct muram_block *tmp;

+ size = 0;
spin_lock_irqsave(&cpm_muram_lock, flags);
- ret = rh_free(&cpm_muram_info, offset);
+ list_for_each_entry(tmp, &muram_block_list, head) {
+ if (tmp->start == offset) {
+ size = tmp->size;
+ list_del(&tmp->head);
+ kfree(tmp);
+ break;
+ }
+ }
+ gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
spin_unlock_irqrestore(&cpm_muram_lock, flags);

- return ret;
+ return size;
}
EXPORT_SYMBOL(cpm_muram_free);

-/**
+/*
* cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
- * @offset: the offset into the muram area to reserve
- * @size: the number of bytes to reserve
+ * @size: number of bytes to allocate
+ * @offset: offset of allocation start address
*
- * This function returns "start" on success, -ENOMEM on failure.
- * Use cpm_dpram_addr() to get the virtual address of the area.
- * Use cpm_muram_free() to free the allocation.
+ * This function returns an offset into the muram area.
*/
unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
{
+
unsigned long start;
unsigned long flags;
+ static struct genpool_data_fixed muram_pool_data_fixed;

spin_lock_irqsave(&cpm_muram_lock, flags);
- cpm_muram_info.alignment = 1;
- start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
+ muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET;
+ gen_pool_set_algo(muram_pool, gen_pool_fixed_alloc,
+ &muram_pool_data_fixed);
+ start = cpm_muram_alloc_common(size, &muram_pool_data_fixed);
spin_unlock_irqrestore(&cpm_muram_lock, flags);
-
return start;
}
EXPORT_SYMBOL(cpm_muram_alloc_fixed);

+/*
+ * cpm_muram_alloc_common - cpm_muram_alloc common code
+ * @size: number of bytes to allocate
+ * @data: data for genalloc's algorithm.
+ *
+ * This function returns an offset into the muram area.
+ */
+unsigned long cpm_muram_alloc_common(unsigned long size, void *data)
+{
+ struct muram_block *entry;
+ unsigned long start;
+
+ start = gen_pool_alloc_data(muram_pool, size, data);
+ if (!start)
+ goto out2;
+ start = start - GENPOOL_OFFSET;
+ memset(cpm_muram_addr(start), 0, size);
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ goto out1;
+ entry->start = start;
+ entry->size = size;
+ list_add(&entry->head, &muram_block_list);
+
+ return start;
+out1:
+ gen_pool_free(muram_pool, start, size);
+out2:
+ return (unsigned long) -ENOMEM;
+}
+
/**
* cpm_muram_addr - turn a muram offset into a virtual address
* @offset: muram offset to convert
--
2.1.0.27.g96db324

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