From: Chris Lew <clew@xxxxxxxxxxxxxx>
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>
---
Changes since v1:
- Move V12 descriptions to top comment
- Add cacheline support to global partition
- Add ptable get helper function
- Move global partition init to version check
Changes since v2:
- Return -ENOENT if partition table does not exist
- Exclude -ENOENT error propagation from enumerate_partitions()
- Reduce subject to 50 chars and wrap summary to 72 chars
drivers/soc/qcom/smem.c | 172 +++++++++++++++++++++++++++++++++++++++---------
1 file changed, 142 insertions(+), 30 deletions(-)
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 540322ae409e..6a3134e9c591 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -55,6 +55,10 @@
* is hence the region between the cached and non-cached offsets. The header of
* cached items comes after the data.
*
+ * 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.
*
* To synchronize allocations in the shared memory heaps a remote spinlock must
* be held - currently lock number 3 of the sfpb or tcsr is used for this on all
@@ -68,7 +72,8 @@
* version is a valid version as a sanity check.
*/
#define SMEM_MASTER_SBL_VERSION_INDEX 7
-#define SMEM_EXPECTED_VERSION 11
+#define SMEM_GLOBAL_HEAP_VERSION 11
+#define SMEM_GLOBAL_PART_VERSION 12
/*
* The first 8 items are only to be allocated by the boot loader while
@@ -82,6 +87,9 @@
/* Processor/host identifier for the application processor */
#define SMEM_HOST_APPS 0
+/* Processor/host identifier for the global partition */
+#define SMEM_GLOBAL_HOST 0xfffe
+
/* Max number of processors/hosts in a system */
#define SMEM_HOST_COUNT 9
@@ -230,6 +238,8 @@ 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
@@ -241,6 +251,8 @@ 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];
@@ -317,16 +329,14 @@ 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);
@@ -334,8 +344,8 @@ 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;
}
@@ -373,8 +383,8 @@ static int qcom_smem_alloc_global(struct qcom_smem *smem,
unsigned item,
size_t size)
{
- struct smem_header *header;
struct smem_global_entry *entry;
+ struct smem_header *header;
if (WARN_ON(item >= SMEM_ITEM_COUNT))
return -EINVAL;
@@ -416,6 +426,7 @@ static int qcom_smem_alloc_global(struct qcom_smem *smem,
*/
int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
{
+ struct smem_partition_header *phdr;
unsigned long flags;
int ret;
@@ -434,10 +445,15 @@ 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);
@@ -479,16 +495,12 @@ 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);
@@ -531,7 +543,8 @@ 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);
}
@@ -547,7 +560,9 @@ static void *qcom_smem_get_private(struct qcom_smem *smem,
*/
void *qcom_smem_get(unsigned host, unsigned item, size_t *size)
{
+ struct smem_partition_header *phdr;
unsigned long flags;
+ size_t cacheln;
int ret;
void *ptr = ERR_PTR(-EPROBE_DEFER);
@@ -560,10 +575,17 @@ 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);
@@ -592,6 +614,10 @@ 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);
@@ -612,27 +638,106 @@ static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
return le32_to_cpu(versions[SMEM_MASTER_SBL_VERSION_INDEX]);
}
-static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
- unsigned local_host)
+static struct smem_ptable *qcom_smem_get_ptable(struct qcom_smem *smem)
{
- struct smem_partition_header *header;
- struct smem_ptable_entry *entry;
struct smem_ptable *ptable;
- unsigned remote_host;
- u32 version, host0, host1;
- int i;
+ u32 version;
ptable = smem->regions[0].virt_base + smem->regions[0].size - SZ_4K;
if (memcmp(ptable->magic, SMEM_PTABLE_MAGIC, sizeof(ptable->magic)))
- return 0;
+ return ERR_PTR(-ENOENT);
version = le32_to_cpu(ptable->version);
if (version != 1) {
dev_err(smem->dev,
"Unsupported partition header version %d\n", version);
+ return ERR_PTR(-EINVAL);
+ }
+ return ptable;
+}
+
+static int qcom_smem_set_global_partition(struct qcom_smem *smem)
+{
+ struct smem_partition_header *header;
+ struct smem_ptable_entry *entry = NULL;
+ struct smem_ptable *ptable;
+ u32 host0, host1, size;
+ int i;
+
+ ptable = qcom_smem_get_ptable(smem);
+ if (IS_ERR(ptable))
+ return PTR_ERR(ptable);
+
+ for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) {
+ entry = &ptable->entry[i];
+ host0 = le16_to_cpu(entry->host0);
+ host1 = le16_to_cpu(entry->host1);
+
+ if (host0 == SMEM_GLOBAL_HOST && host0 == host1)
+ break;
+ }
+
+ if (!entry) {
+ dev_err(smem->dev, "Missing entry for global partition\n");
+ return -EINVAL;
+ }
+
+ if (!le32_to_cpu(entry->offset) || !le32_to_cpu(entry->size)) {
+ dev_err(smem->dev, "Invalid entry for global partition\n");
+ return -EINVAL;
+ }
+
+ 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);
+
+ if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) {
+ dev_err(smem->dev, "Global 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 (le32_to_cpu(header->size) != le32_to_cpu(entry->size)) {
+ dev_err(smem->dev, "Global partition has invalid size\n");
return -EINVAL;
}
+ size = le32_to_cpu(header->offset_free_uncached);
+ if (size > 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,
+ unsigned int local_host)
+{
+ struct smem_partition_header *header;
+ struct smem_ptable_entry *entry;
+ struct smem_ptable *ptable;
+ unsigned int remote_host;
+ u32 host0, host1;
+ int i;
+
+ ptable = qcom_smem_get_ptable(smem);
+ if (IS_ERR(ptable))
+ return PTR_ERR(ptable);
+
for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) {
entry = &ptable->entry[i];
host0 = le16_to_cpu(entry->host0);
@@ -773,13 +878,20 @@ 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:
+ ret = qcom_smem_set_global_partition(smem);
+ if (ret < 0)
+ return ret;
+ case SMEM_GLOBAL_HEAP_VERSION:
+ break;
+ default:
dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version);
return -EINVAL;
}
ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS);
- if (ret < 0)
+ if (ret < 0 && ret != -ENOENT)
return ret;
hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
--
To unsubscribe from this list: send the line "unsubscribe linux-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
