SMEM V12 creates a global partition to allocate global
smem items from instead of a global heap. The global
partition has the same structure as a private partition.
Signed-off-by: Chris Lew <clew@xxxxxxxxxxxxxx>
---
drivers/soc/qcom/smem.c | 134 +++++++++++++++++++++++++++++++++++++-----------
1 file changed, 105 insertions(+), 29 deletions(-)
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index c28275be0038..fed2934d6bda 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -65,11 +65,20 @@
/*
* Item 3 of the global heap contains an array of versions for the various
* software components in the SoC. We verify that the boot loader version is
- * what the expected version (SMEM_EXPECTED_VERSION) as a sanity check.
+ * a valid version as a sanity check.
*/
#define SMEM_ITEM_VERSION 3
#define SMEM_MASTER_SBL_VERSION_INDEX 7
-#define SMEM_EXPECTED_VERSION 11
+#define SMEM_GLOBAL_HEAP_VERSION 11
+
+/*
+ * Version 12 (SMEM_GLOBAL_PART_VERSION) changes the item alloc/get procedure
+ * for the global heap. A new global partition is created from the global heap
+ * region with partition type (SMEM_GLOBAL_HOST) and the max smem item count is
+ * set by the bootloader.
+ */
+#define SMEM_GLOBAL_PART_VERSION 12
+#define SMEM_GLOBAL_HOST 0xfffe
/*
* The first 8 items are only to be allocated by the boot loader while
@@ -231,6 +240,8 @@ struct smem_region {
* struct qcom_smem - device data for the smem device
* @dev: device pointer
* @hwlock: reference to a hwspinlock
+ * @global_partition: pointer to global partition when in use
+ * @global_cacheline: cacheline size for global partition
* @partitions: list of pointers to partitions affecting the current
* processor/host
* @cacheline: list of cacheline sizes for each host
@@ -242,6 +253,8 @@ struct qcom_smem {
struct hwspinlock *hwlock;
+ struct smem_partition_header *global_partition;
+ size_t global_cacheline;
struct smem_partition_header *partitions[SMEM_HOST_COUNT];
size_t cacheline[SMEM_HOST_COUNT];
@@ -318,16 +331,14 @@ static void *cached_entry_to_item(struct smem_private_entry *e)
#define HWSPINLOCK_TIMEOUT 1000
static int qcom_smem_alloc_private(struct qcom_smem *smem,
- unsigned host,
+ struct smem_partition_header *phdr,
unsigned item,
size_t size)
{
- struct smem_partition_header *phdr;
struct smem_private_entry *hdr, *end;
size_t alloc_size;
void *cached;
- phdr = smem->partitions[host];
hdr = phdr_to_first_uncached_entry(phdr);
end = phdr_to_last_uncached_entry(phdr);
cached = phdr_to_last_cached_entry(phdr);
@@ -335,8 +346,8 @@ static int qcom_smem_alloc_private(struct qcom_smem *smem,
while (hdr < end) {
if (hdr->canary != SMEM_PRIVATE_CANARY) {
dev_err(smem->dev,
- "Found invalid canary in host %d partition\n",
- host);
+ "Found invalid canary in hosts %d:%d partition\n",
+ phdr->host0, phdr->host1);
return -EINVAL;
}
@@ -419,6 +430,7 @@ int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
{
unsigned long flags;
int ret;
+ struct smem_partition_header *phdr;
if (!__smem)
return -EPROBE_DEFER;
@@ -435,10 +447,15 @@ int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
if (ret)
return ret;
- if (host < SMEM_HOST_COUNT && __smem->partitions[host])
- ret = qcom_smem_alloc_private(__smem, host, item, size);
- else
+ if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
+ phdr = __smem->partitions[host];
+ ret = qcom_smem_alloc_private(__smem, phdr, item, size);
+ } else if (__smem->global_partition) {
+ phdr = __smem->global_partition;
+ ret = qcom_smem_alloc_private(__smem, phdr, item, size);
+ } else {
ret = qcom_smem_alloc_global(__smem, item, size);
+ }
hwspin_unlock_irqrestore(__smem->hwlock, &flags);
@@ -480,16 +497,12 @@ static void *qcom_smem_get_global(struct qcom_smem *smem,
}
static void *qcom_smem_get_private(struct qcom_smem *smem,
- unsigned host,
+ struct smem_partition_header *phdr,
+ size_t cacheline,
unsigned item,
size_t *size)
{
- struct smem_partition_header *phdr;
struct smem_private_entry *e, *end;
- size_t cacheline;
-
- phdr = smem->partitions[host];
- cacheline = smem->cacheline[host];
e = phdr_to_first_uncached_entry(phdr);
end = phdr_to_last_uncached_entry(phdr);
@@ -532,7 +545,8 @@ static void *qcom_smem_get_private(struct qcom_smem *smem,
return ERR_PTR(-ENOENT);
invalid_canary:
- dev_err(smem->dev, "Found invalid canary in host %d partition\n", host);
+ dev_err(smem->dev, "Found invalid canary in hosts %d:%d partition\n",
+ phdr->host0, phdr->host1);
return ERR_PTR(-EINVAL);
}
@@ -551,6 +565,8 @@ void *qcom_smem_get(unsigned host, unsigned item, size_t *size)
unsigned long flags;
int ret;
void *ptr = ERR_PTR(-EPROBE_DEFER);
+ struct smem_partition_header *phdr;
+ size_t cacheln;
if (!__smem)
return ptr;
@@ -561,10 +577,17 @@ void *qcom_smem_get(unsigned host, unsigned item, size_t *size)
if (ret)
return ERR_PTR(ret);
- if (host < SMEM_HOST_COUNT && __smem->partitions[host])
- ptr = qcom_smem_get_private(__smem, host, item, size);
- else
+ if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
+ phdr = __smem->partitions[host];
+ cacheln = __smem->cacheline[host];
+ ptr = qcom_smem_get_private(__smem, phdr, cacheln, item, size);
+ } else if (__smem->global_partition) {
+ phdr = __smem->global_partition;
+ cacheln = __smem->global_cacheline;
+ ptr = qcom_smem_get_private(__smem, phdr, cacheln, item, size);
+ } else {
ptr = qcom_smem_get_global(__smem, item, size);
+ }
hwspin_unlock_irqrestore(__smem->hwlock, &flags);
@@ -593,6 +616,10 @@ int qcom_smem_get_free_space(unsigned host)
phdr = __smem->partitions[host];
ret = le32_to_cpu(phdr->offset_free_cached) -
le32_to_cpu(phdr->offset_free_uncached);
+ } else if (__smem->global_partition) {
+ phdr = __smem->global_partition;
+ ret = le32_to_cpu(phdr->offset_free_cached) -
+ le32_to_cpu(phdr->offset_free_uncached);
} else {
header = __smem->regions[0].virt_base;
ret = le32_to_cpu(header->available);
@@ -604,21 +631,61 @@ int qcom_smem_get_free_space(unsigned host)
static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
{
+ struct smem_header *header;
__le32 *versions;
- size_t size;
- versions = qcom_smem_get_global(smem, SMEM_ITEM_VERSION, &size);
- if (IS_ERR(versions)) {
- dev_err(smem->dev, "Unable to read the version item\n");
- return -ENOENT;
+ header = smem->regions[0].virt_base;
+ versions = header->version;
+
+ return le32_to_cpu(versions[SMEM_MASTER_SBL_VERSION_INDEX]);
+}
+
+static int qcom_smem_set_global_partition(struct qcom_smem *smem,
+ struct smem_ptable_entry *entry)
+{
+ struct smem_partition_header *header;
+ u32 host0, host1;
+
+ if (!le32_to_cpu(entry->offset) || !le32_to_cpu(entry->size)) {
+ dev_err(smem->dev, "Invalid entry for gloabl partition\n");
+ return -EINVAL;
}
- if (size < sizeof(unsigned) * SMEM_MASTER_SBL_VERSION_INDEX) {
- dev_err(smem->dev, "Version item is too small\n");
+ if (smem->global_partition) {
+ dev_err(smem->dev, "Already found the global partition\n");
return -EINVAL;
}
+ header = smem->regions[0].virt_base + le32_to_cpu(entry->offset);
+ host0 = le16_to_cpu(header->host0);
+ host1 = le16_to_cpu(header->host1);
- return le32_to_cpu(versions[SMEM_MASTER_SBL_VERSION_INDEX]);
+ if (memcmp(header->magic, SMEM_PART_MAGIC,
+ sizeof(header->magic))) {
+ dev_err(smem->dev, "Gloal partition has invalid magic\n");
+ return -EINVAL;
+ }
+
+ if (host0 != SMEM_GLOBAL_HOST && host1 != SMEM_GLOBAL_HOST) {
+ dev_err(smem->dev, "Global partition hosts are invalid\n");
+ return -EINVAL;
+ }
+
+ if (header->size != entry->size) {
+ dev_err(smem->dev, "Global partition has invalid size\n");
+ return -EINVAL;
+ }
+
+ if (le32_to_cpu(header->offset_free_uncached) >
+ le32_to_cpu(header->size)) {
+ dev_err(smem->dev,
+ "Global partition has invalid free pointer\n");
+ return -EINVAL;
+ }
+
+ smem->global_partition = header;
+ smem->global_cacheline = le32_to_cpu(entry->cacheline);
+
+ return 0;
}
static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
@@ -647,6 +714,12 @@ static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
host0 = le16_to_cpu(entry->host0);
host1 = le16_to_cpu(entry->host1);
+ if (host0 == SMEM_GLOBAL_HOST && host0 == host1) {
+ if (qcom_smem_set_global_partition(smem, entry))
+ return -EINVAL;
+ continue;
+ }
+
if (host0 != local_host && host1 != local_host)
continue;
@@ -782,7 +855,10 @@ static int qcom_smem_probe(struct platform_device *pdev)
}
version = qcom_smem_get_sbl_version(smem);
- if (version >> 16 != SMEM_EXPECTED_VERSION) {
+ switch (version >> 16) {
+ case SMEM_GLOBAL_PART_VERSION:
+ case SMEM_GLOBAL_HEAP_VERSION:
+ default:
dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version);
return -EINVAL;
}
--
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