Blackfin arch: Extend sram malloc to handle L2 SRAM.

Extend system call to alloc L2 SRAM in application.
Automatically move following sections to L2 SRAM:
1. kernel built-in l2 attribute section
2. kernel module l2 attribute section
3. elf-fdpic application l2 attribute section

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 137 insertions, 33 deletions

diff --git a/arch/blackfin/mm/blackfin_sram.c b/arch/blackfin/mm/blackfin_sram.c
index b58cf196d7cc..5af3c31c9365 100644
--- a/arch/blackfin/mm/blackfin_sram.c
+++ b/arch/blackfin/mm/blackfin_sram.c
@@ -42,6 +42,7 @@
 #include "blackfin_sram.h"
 
 static spinlock_t l1sram_lock, l1_data_sram_lock, l1_inst_sram_lock;
+static spinlock_t l2_sram_lock;
 
 /* the data structure for L1 scratchpad and DATA SRAM */
 struct sram_piece {
@@ -65,6 +66,10 @@ static struct sram_piece free_l1_data_B_sram_head, used_l1_data_B_sram_head;
 static struct sram_piece free_l1_inst_sram_head, used_l1_inst_sram_head;
 #endif
 
+#ifdef L2_LENGTH
+static struct sram_piece free_l2_sram_head, used_l2_sram_head;
+#endif
+
 static struct kmem_cache *sram_piece_cache;
 
 /* L1 Scratchpad SRAM initialization function */
@@ -97,7 +102,7 @@ static void __init l1_data_sram_init(void)
         free_l1_data_A_sram_head.next =
                 kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
         if (!free_l1_data_A_sram_head.next) {
-                printk(KERN_INFO"Fail to initialize Data A SRAM.\n");
+                printk(KERN_INFO"Fail to initialize L1 Data A SRAM.\n");
                 return;
         }
 
@@ -110,7 +115,7 @@ static void __init l1_data_sram_init(void)
 
         used_l1_data_A_sram_head.next = NULL;
 
-        printk(KERN_INFO "Blackfin Data A SRAM: %d KB (%d KB free)\n",
+        printk(KERN_INFO "Blackfin L1 Data A SRAM: %d KB (%d KB free)\n",
                 L1_DATA_A_LENGTH >> 10,
                 free_l1_data_A_sram_head.next->size >> 10);
 #endif
@@ -118,7 +123,7 @@ static void __init l1_data_sram_init(void)
         free_l1_data_B_sram_head.next =
                 kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
         if (!free_l1_data_B_sram_head.next) {
-                printk(KERN_INFO"Fail to initialize Data B SRAM.\n");
+                printk(KERN_INFO"Fail to initialize L1 Data B SRAM.\n");
                 return;
         }
 
@@ -131,7 +136,7 @@ static void __init l1_data_sram_init(void)
 
         used_l1_data_B_sram_head.next = NULL;
 
-        printk(KERN_INFO "Blackfin Data B SRAM: %d KB (%d KB free)\n",
+        printk(KERN_INFO "Blackfin L1 Data B SRAM: %d KB (%d KB free)\n",
                 L1_DATA_B_LENGTH >> 10,
                 free_l1_data_B_sram_head.next->size >> 10);
 #endif
@@ -146,7 +151,7 @@ static void __init l1_inst_sram_init(void)
         free_l1_inst_sram_head.next =
                 kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
         if (!free_l1_inst_sram_head.next) {
-                printk(KERN_INFO"Fail to initialize Instruction SRAM.\n");
+                printk(KERN_INFO"Fail to initialize L1 Instruction SRAM.\n");
                 return;
         }
 
@@ -159,7 +164,7 @@ static void __init l1_inst_sram_init(void)
 
         used_l1_inst_sram_head.next = NULL;
 
-        printk(KERN_INFO "Blackfin Instruction SRAM: %d KB (%d KB free)\n",
+        printk(KERN_INFO "Blackfin L1 Instruction SRAM: %d KB (%d KB free)\n",
                 L1_CODE_LENGTH >> 10,
                 free_l1_inst_sram_head.next->size >> 10);
 #endif
@@ -168,6 +173,33 @@ static void __init l1_inst_sram_init(void)
         spin_lock_init(&l1_inst_sram_lock);
 }
 
+static void __init l2_sram_init(void)
+{
+#ifdef L2_LENGTH
+        free_l2_sram_head.next =
+                kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
+        if (!free_l2_sram_head.next) {
+                printk(KERN_INFO"Fail to initialize L2 SRAM.\n");
+                return;
+        }
+
+        free_l2_sram_head.next->paddr = (void *)L2_START +
+                (_etext_l2 - _stext_l2) + (_edata_l2 - _sdata_l2);
+        free_l2_sram_head.next->size = L2_LENGTH -
+                (_etext_l2 - _stext_l2) + (_edata_l2 - _sdata_l2);
+        free_l2_sram_head.next->pid = 0;
+        free_l2_sram_head.next->next = NULL;
+
+        used_l2_sram_head.next = NULL;
+
+        printk(KERN_INFO "Blackfin L2 SRAM: %d KB (%d KB free)\n",
+                L2_LENGTH >> 10,
+                free_l2_sram_head.next->size >> 10);
+#endif
+
+        /* mutex initialize */
+        spin_lock_init(&l2_sram_lock);
+}
 void __init bfin_sram_init(void)
 {
         sram_piece_cache = kmem_cache_create("sram_piece_cache",
@@ -177,10 +209,11 @@ void __init bfin_sram_init(void)
         l1sram_init();
         l1_data_sram_init();
         l1_inst_sram_init();
+        l2_sram_init();
 }
 
-/* L1 memory allocate function */
-static void *_l1_sram_alloc(size_t size, struct sram_piece *pfree_head,
+/* SRAM allocate function */
+static void *_sram_alloc(size_t size, struct sram_piece *pfree_head,
                 struct sram_piece *pused_head)
 {
         struct sram_piece *pslot, *plast, *pavail;
@@ -236,7 +269,7 @@ static void *_l1_sram_alloc(size_t size, struct sram_piece *pfree_head,
 }
 
 /* Allocate the largest available block.  */
-static void *_l1_sram_alloc_max(struct sram_piece *pfree_head,
+static void *_sram_alloc_max(struct sram_piece *pfree_head,
                                 struct sram_piece *pused_head,
                                 unsigned long *psize)
 {
@@ -259,11 +292,11 @@ static void *_l1_sram_alloc_max(struct sram_piece *pfree_head,
 
         *psize = pmax->size;
 
-        return _l1_sram_alloc(*psize, pfree_head, pused_head);
+        return _sram_alloc(*psize, pfree_head, pused_head);
 }
 
-/* L1 memory free function */
-static int _l1_sram_free(const void *addr,
+/* SRAM free function */
+static int _sram_free(const void *addr,
                         struct sram_piece *pfree_head,
                         struct sram_piece *pused_head)
 {
@@ -334,6 +367,11 @@ int sram_free(const void *addr)
                  && addr < (void *)(L1_DATA_B_START + L1_DATA_B_LENGTH))
                 return l1_data_B_sram_free(addr);
 #endif
+#ifdef L2_LENGTH
+        else if (addr >= (void *)L2_START
+                 && addr < (void *)(L2_START + L2_LENGTH))
+                return l2_sram_free(addr);
+#endif
         else
                 return -1;
 }
@@ -348,7 +386,7 @@ void *l1_data_A_sram_alloc(size_t size)
         spin_lock_irqsave(&l1_data_sram_lock, flags);
 
 #if L1_DATA_A_LENGTH != 0
-        addr = _l1_sram_alloc(size, &free_l1_data_A_sram_head,
+        addr = _sram_alloc(size, &free_l1_data_A_sram_head,
                         &used_l1_data_A_sram_head);
 #endif
 
@@ -371,7 +409,7 @@ int l1_data_A_sram_free(const void *addr)
         spin_lock_irqsave(&l1_data_sram_lock, flags);
 
 #if L1_DATA_A_LENGTH != 0
-        ret = _l1_sram_free(addr, &free_l1_data_A_sram_head,
+        ret = _sram_free(addr, &free_l1_data_A_sram_head,
                         &used_l1_data_A_sram_head);
 #else
         ret = -1;
@@ -393,7 +431,7 @@ void *l1_data_B_sram_alloc(size_t size)
         /* add mutex operation */
         spin_lock_irqsave(&l1_data_sram_lock, flags);
 
-        addr = _l1_sram_alloc(size, &free_l1_data_B_sram_head,
+        addr = _sram_alloc(size, &free_l1_data_B_sram_head,
                         &used_l1_data_B_sram_head);
 
         /* add mutex operation */
@@ -418,7 +456,7 @@ int l1_data_B_sram_free(const void *addr)
         /* add mutex operation */
         spin_lock_irqsave(&l1_data_sram_lock, flags);
 
-        ret = _l1_sram_free(addr, &free_l1_data_B_sram_head,
+        ret = _sram_free(addr, &free_l1_data_B_sram_head,
                         &used_l1_data_B_sram_head);
 
         /* add mutex operation */
@@ -472,7 +510,7 @@ void *l1_inst_sram_alloc(size_t size)
         /* add mutex operation */
         spin_lock_irqsave(&l1_inst_sram_lock, flags);
 
-        addr = _l1_sram_alloc(size, &free_l1_inst_sram_head,
+        addr = _sram_alloc(size, &free_l1_inst_sram_head,
                         &used_l1_inst_sram_head);
 
         /* add mutex operation */
@@ -497,7 +535,7 @@ int l1_inst_sram_free(const void *addr)
         /* add mutex operation */
         spin_lock_irqsave(&l1_inst_sram_lock, flags);
 
-        ret = _l1_sram_free(addr, &free_l1_inst_sram_head,
+        ret = _sram_free(addr, &free_l1_inst_sram_head,
                         &used_l1_inst_sram_head);
 
         /* add mutex operation */
@@ -519,7 +557,7 @@ void *l1sram_alloc(size_t size)
         /* add mutex operation */
         spin_lock_irqsave(&l1sram_lock, flags);
 
-        addr = _l1_sram_alloc(size, &free_l1_ssram_head,
+        addr = _sram_alloc(size, &free_l1_ssram_head,
                         &used_l1_ssram_head);
 
         /* add mutex operation */
@@ -537,7 +575,7 @@ void *l1sram_alloc_max(size_t *psize)
         /* add mutex operation */
         spin_lock_irqsave(&l1sram_lock, flags);
 
-        addr = _l1_sram_alloc_max(&free_l1_ssram_head,
+        addr = _sram_alloc_max(&free_l1_ssram_head,
                         &used_l1_ssram_head, psize);
 
         /* add mutex operation */
@@ -555,7 +593,7 @@ int l1sram_free(const void *addr)
         /* add mutex operation */
         spin_lock_irqsave(&l1sram_lock, flags);
 
-        ret = _l1_sram_free(addr, &free_l1_ssram_head,
+        ret = _sram_free(addr, &free_l1_ssram_head,
                         &used_l1_ssram_head);
 
         /* add mutex operation */
@@ -564,6 +602,64 @@ int l1sram_free(const void *addr)
         return ret;
 }
 
+void *l2_sram_alloc(size_t size)
+{
+#ifdef L2_LENGTH
+        unsigned flags;
+        void *addr;
+
+        /* add mutex operation */
+        spin_lock_irqsave(&l2_sram_lock, flags);
+
+        addr = _sram_alloc(size, &free_l2_sram_head,
+                        &used_l2_sram_head);
+
+        /* add mutex operation */
+        spin_unlock_irqrestore(&l2_sram_lock, flags);
+
+        pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
+                 (long unsigned int)addr, size);
+
+        return addr;
+#else
+        return NULL;
+#endif
+}
+EXPORT_SYMBOL(l2_sram_alloc);
+
+void *l2_sram_zalloc(size_t size)
+{
+        void *addr = l2_sram_alloc(size);
+
+        if (addr)
+                memset(addr, 0x00, size);
+
+        return addr;
+}
+EXPORT_SYMBOL(l2_sram_zalloc);
+
+int l2_sram_free(const void *addr)
+{
+#ifdef L2_LENGTH
+        unsigned flags;
+        int ret;
+
+        /* add mutex operation */
+        spin_lock_irqsave(&l2_sram_lock, flags);
+
+        ret = _sram_free(addr, &free_l2_sram_head,
+                        &used_l2_sram_head);
+
+        /* add mutex operation */
+        spin_unlock_irqrestore(&l2_sram_lock, flags);
+
+        return ret;
+#else
+        return -1;
+#endif
+}
+EXPORT_SYMBOL(l2_sram_free);
+
 int sram_free_with_lsl(const void *addr)
 {
         struct sram_list_struct *lsl, **tmp;
@@ -602,6 +698,9 @@ void *sram_alloc_with_lsl(size_t size, unsigned long flags)
         if (addr == NULL && (flags & L1_DATA_B_SRAM))
                 addr = l1_data_B_sram_alloc(size);
 
+        if (addr == NULL && (flags & L2_SRAM))
+                addr = l2_sram_alloc(size);
+
         if (addr == NULL) {
                 kfree(lsl);
                 return NULL;
@@ -621,7 +720,7 @@ EXPORT_SYMBOL(sram_alloc_with_lsl);
 /* Need to keep line of output the same.  Currently, that is 44 bytes
  * (including newline).
  */
-static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
+static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
                 struct sram_piece *pfree_head,
                 struct sram_piece *pused_head)
 {
@@ -630,13 +729,13 @@ static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
         if (!pfree_head || !pused_head)
                 return -1;
 
-        *len += sprintf(&buf[*len], "--- L1 %-14s Size   PID State     \n", desc);
+        *len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
 
         /* search the relevant memory slot */
         pslot = pused_head->next;
 
         while (pslot != NULL) {
-                *len += sprintf(&buf[*len], "%p-%p %8i %5i %-10s\n",
+                *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
                         pslot->paddr, pslot->paddr + pslot->size,
                         pslot->size, pslot->pid, "ALLOCATED");
 
@@ -646,7 +745,7 @@ static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
         pslot = pfree_head->next;
 
         while (pslot != NULL) {
-                *len += sprintf(&buf[*len], "%p-%p %8i %5i %-10s\n",
+                *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
                         pslot->paddr, pslot->paddr + pslot->size,
                         pslot->size, pslot->pid, "FREE");
 
@@ -655,38 +754,43 @@ static int _l1sram_proc_read(char *buf, int *len, int count, const char *desc,
 
         return 0;
 }
-static int l1sram_proc_read(char *buf, char **start, off_t offset, int count,
+static int sram_proc_read(char *buf, char **start, off_t offset, int count,
                 int *eof, void *data)
 {
         int len = 0;
 
-        if (_l1sram_proc_read(buf, &len, count, "Scratchpad",
+        if (_sram_proc_read(buf, &len, count, "Scratchpad",
                         &free_l1_ssram_head, &used_l1_ssram_head))
                 goto not_done;
 #if L1_DATA_A_LENGTH != 0
-        if (_l1sram_proc_read(buf, &len, count, "Data A",
+        if (_sram_proc_read(buf, &len, count, "L1 Data A",
                         &free_l1_data_A_sram_head,
                         &used_l1_data_A_sram_head))
                 goto not_done;
 #endif
 #if L1_DATA_B_LENGTH != 0
-        if (_l1sram_proc_read(buf, &len, count, "Data B",
+        if (_sram_proc_read(buf, &len, count, "L1 Data B",
                         &free_l1_data_B_sram_head,
                         &used_l1_data_B_sram_head))
                 goto not_done;
 #endif
 #if L1_CODE_LENGTH != 0
-        if (_l1sram_proc_read(buf, &len, count, "Instruction",
+        if (_sram_proc_read(buf, &len, count, "L1 Instruction",
                         &free_l1_inst_sram_head, &used_l1_inst_sram_head))
                 goto not_done;
 #endif
+#ifdef L2_LENGTH
+        if (_sram_proc_read(buf, &len, count, "L2",
+                        &free_l2_sram_head, &used_l2_sram_head))
+                goto not_done;
+#endif
 
         *eof = 1;
  not_done:
         return len;
 }
 
-static int __init l1sram_proc_init(void)
+static int __init sram_proc_init(void)
 {
         struct proc_dir_entry *ptr;
         ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
@@ -695,8 +799,8 @@ static int __init l1sram_proc_init(void)
                 return -1;
         }
         ptr->owner = THIS_MODULE;
-        ptr->read_proc = l1sram_proc_read;
+        ptr->read_proc = sram_proc_read;
         return 0;
 }
-late_initcall(l1sram_proc_init);
+late_initcall(sram_proc_init);
 #endif