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Subject[PATCH v2 4/5] soc: qcom: smem: Support dynamic item limit
Date
In V12 SMEM, SBL writes SMEM parameter information
after the TOC. Use the SBL provided item count
as the max item number.

Signed-off-by: Chris Lew <clew@codeaurora.org>
---

Changes since v1:
- Change num_items to __le16 from __le32
- Move max smem item warning to generic get/alloc functions
- Use get ptable helper function

drivers/soc/qcom/smem.c | 51 +++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 88d5ec663304..2f3b1e1a8904 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -223,6 +223,24 @@ struct smem_private_entry {
#define SMEM_PRIVATE_CANARY 0xa5a5

/**
+ * struct smem_info - smem region info located after the table of contents
+ * @magic: magic number, must be SMEM_INFO_MAGIC
+ * @size: size of the smem region
+ * @base_addr: base address of the smem region
+ * @reserved: for now reserved entry
+ * @num_items: highest accepted item number
+ */
+struct smem_info {
+ u8 magic[4];
+ __le32 size;
+ __le32 base_addr;
+ __le32 reserved;
+ __le16 num_items;
+};
+
+static const u8 SMEM_INFO_MAGIC[] = { 0x53, 0x49, 0x49, 0x49 }; /* SIII */
+
+/**
* struct smem_region - representation of a chunk of memory used for smem
* @aux_base: identifier of aux_mem base
* @virt_base: virtual base address of memory with this aux_mem identifier
@@ -243,6 +261,7 @@ struct smem_region {
* @partitions: list of pointers to partitions affecting the current
* processor/host
* @cacheline: list of cacheline sizes for each host
+ * @item_count: max accepted item number
* @num_regions: number of @regions
* @regions: list of the memory regions defining the shared memory
*/
@@ -255,6 +274,7 @@ struct qcom_smem {
size_t global_cacheline;
struct smem_partition_header *partitions[SMEM_HOST_COUNT];
size_t cacheline[SMEM_HOST_COUNT];
+ u32 item_count;

unsigned num_regions;
struct smem_region regions[0];
@@ -386,9 +406,6 @@ static int qcom_smem_alloc_global(struct qcom_smem *smem,
struct smem_global_entry *entry;
struct smem_header *header;

- if (WARN_ON(item >= SMEM_ITEM_COUNT))
- return -EINVAL;
-
header = smem->regions[0].virt_base;
entry = &header->toc[item];
if (entry->allocated)
@@ -439,6 +456,9 @@ int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
return -EINVAL;
}

+ if (WARN_ON(item >= __smem->item_count))
+ return -EINVAL;
+
ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
HWSPINLOCK_TIMEOUT,
&flags);
@@ -471,9 +491,6 @@ static void *qcom_smem_get_global(struct qcom_smem *smem,
u32 aux_base;
unsigned i;

- if (WARN_ON(item >= SMEM_ITEM_COUNT))
- return ERR_PTR(-EINVAL);
-
header = smem->regions[0].virt_base;
entry = &header->toc[item];
if (!entry->allocated)
@@ -569,6 +586,9 @@ void *qcom_smem_get(unsigned host, unsigned item, size_t *size)
if (!__smem)
return ptr;

+ if (WARN_ON(item >= __smem->item_count))
+ return ERR_PTR(-EINVAL);
+
ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
HWSPINLOCK_TIMEOUT,
&flags);
@@ -656,6 +676,22 @@ static struct smem_ptable *qcom_smem_get_ptable(struct qcom_smem *smem)
return ptable;
}

+static u32 qcom_smem_get_dynamic_item(struct qcom_smem *smem)
+{
+ struct smem_ptable *ptable;
+ struct smem_info *info;
+
+ ptable = qcom_smem_get_ptable(smem);
+ if (IS_ERR_OR_NULL(ptable))
+ return SMEM_ITEM_COUNT;
+
+ info = (struct smem_info *)&ptable->entry[ptable->num_entries];
+ if (memcmp(info->magic, SMEM_INFO_MAGIC, sizeof(info->magic)))
+ return SMEM_ITEM_COUNT;
+
+ return le16_to_cpu(info->num_items);
+}
+
static int qcom_smem_set_global_partition(struct qcom_smem *smem)
{
struct smem_partition_header *header;
@@ -883,7 +919,10 @@ static int qcom_smem_probe(struct platform_device *pdev)
ret = qcom_smem_set_global_partition(smem);
if (ret < 0)
return ret;
+ smem->item_count = qcom_smem_get_dynamic_item(smem);
+ break;
case SMEM_GLOBAL_HEAP_VERSION:
+ smem->item_count = SMEM_ITEM_COUNT;
break;
default:
dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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