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authorAmit Sunil Dhamne <amit.sunil.dhamne@xilinx.com>2020-11-23 21:52:41 -0800
committerMichal Simek <michal.simek@xilinx.com>2020-11-24 15:13:54 +0100
commitacfdd18591eaac25446e976a0c0d190f8b3dbfb1 (patch)
treedd3ee92815329015132c280e6c802237c3266570 /drivers/firmware/xilinx
parentf4426311f927b01776edf8a45f6fad90feae4e72 (diff)
firmware: xilinx: Use hash-table for api feature check
Currently array of fix length PM_API_MAX is used to cache the pm_api version (valid or invalid). However ATF based PM APIs values are much higher then PM_API_MAX. So to include ATF based PM APIs also, use hash-table to store the pm_api version status. Signed-off-by: Amit Sunil Dhamne <amit.sunil.dhamne@xilinx.com> Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Ravi Patel <ravi.patel@xilinx.com> Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Michal Simek <michal.simek@xilinx.com> Fixes: f3217d6f2f7a ("firmware: xilinx: fix out-of-bounds access") Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/1606197161-25976-1-git-send-email-rajan.vaja@xilinx.com Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'drivers/firmware/xilinx')
-rw-r--r--drivers/firmware/xilinx/zynqmp.c63
1 files changed, 49 insertions, 14 deletions
diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 5828302c7c5c..d08ac824c993 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -20,12 +20,28 @@
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/hashtable.h>
#include <linux/firmware/xlnx-zynqmp.h>
#include "zynqmp-debug.h"
+/* Max HashMap Order for PM API feature check (1<<7 = 128) */
+#define PM_API_FEATURE_CHECK_MAX_ORDER 7
+
static bool feature_check_enabled;
-static u32 zynqmp_pm_features[PM_API_MAX];
+DEFINE_HASHTABLE(pm_api_features_map, PM_API_FEATURE_CHECK_MAX_ORDER);
+
+/**
+ * struct pm_api_feature_data - PM API Feature data
+ * @pm_api_id: PM API Id, used as key to index into hashmap
+ * @feature_status: status of PM API feature: valid, invalid
+ * @hentry: hlist_node that hooks this entry into hashtable
+ */
+struct pm_api_feature_data {
+ u32 pm_api_id;
+ int feature_status;
+ struct hlist_node hentry;
+};
static const struct mfd_cell firmware_devs[] = {
{
@@ -142,29 +158,37 @@ static int zynqmp_pm_feature(u32 api_id)
int ret;
u32 ret_payload[PAYLOAD_ARG_CNT];
u64 smc_arg[2];
+ struct pm_api_feature_data *feature_data;
if (!feature_check_enabled)
return 0;
- /* Return value if feature is already checked */
- if (api_id > ARRAY_SIZE(zynqmp_pm_features))
- return PM_FEATURE_INVALID;
+ /* Check for existing entry in hash table for given api */
+ hash_for_each_possible(pm_api_features_map, feature_data, hentry,
+ api_id) {
+ if (feature_data->pm_api_id == api_id)
+ return feature_data->feature_status;
+ }
- if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
- return zynqmp_pm_features[api_id];
+ /* Add new entry if not present */
+ feature_data = kmalloc(sizeof(*feature_data), GFP_KERNEL);
+ if (!feature_data)
+ return -ENOMEM;
+ feature_data->pm_api_id = api_id;
smc_arg[0] = PM_SIP_SVC | PM_FEATURE_CHECK;
smc_arg[1] = api_id;
ret = do_fw_call(smc_arg[0], smc_arg[1], 0, ret_payload);
- if (ret) {
- zynqmp_pm_features[api_id] = PM_FEATURE_INVALID;
- return PM_FEATURE_INVALID;
- }
+ if (ret)
+ ret = -EOPNOTSUPP;
+ else
+ ret = ret_payload[1];
- zynqmp_pm_features[api_id] = ret_payload[1];
+ feature_data->feature_status = ret;
+ hash_add(pm_api_features_map, &feature_data->hentry, api_id);
- return zynqmp_pm_features[api_id];
+ return ret;
}
/**
@@ -200,9 +224,12 @@ int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
* Make sure to stay in x0 register
*/
u64 smc_arg[4];
+ int ret;
- if (zynqmp_pm_feature(pm_api_id) == PM_FEATURE_INVALID)
- return -ENOTSUPP;
+ /* Check if feature is supported or not */
+ ret = zynqmp_pm_feature(pm_api_id);
+ if (ret < 0)
+ return ret;
smc_arg[0] = PM_SIP_SVC | pm_api_id;
smc_arg[1] = ((u64)arg1 << 32) | arg0;
@@ -1252,9 +1279,17 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
static int zynqmp_firmware_remove(struct platform_device *pdev)
{
+ struct pm_api_feature_data *feature_data;
+ int i;
+
mfd_remove_devices(&pdev->dev);
zynqmp_pm_api_debugfs_exit();
+ hash_for_each(pm_api_features_map, i, feature_data, hentry) {
+ hash_del(&feature_data->hentry);
+ kfree(feature_data);
+ }
+
return 0;
}