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path: root/drivers/gpu/drm/drm_hdcp.c
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Diffstat (limited to 'drivers/gpu/drm/drm_hdcp.c')
-rw-r--r--drivers/gpu/drm/drm_hdcp.c158
1 files changed, 59 insertions, 99 deletions
diff --git a/drivers/gpu/drm/drm_hdcp.c b/drivers/gpu/drm/drm_hdcp.c
index 9191633a3c43..7f386adcf872 100644
--- a/drivers/gpu/drm/drm_hdcp.c
+++ b/drivers/gpu/drm/drm_hdcp.c
@@ -23,14 +23,6 @@
#include "drm_internal.h"
-static struct hdcp_srm {
- u32 revoked_ksv_cnt;
- u8 *revoked_ksv_list;
-
- /* Mutex to protect above struct member */
- struct mutex mutex;
-} *srm_data;
-
static inline void drm_hdcp_print_ksv(const u8 *ksv)
{
DRM_DEBUG("\t%#02x, %#02x, %#02x, %#02x, %#02x\n",
@@ -60,11 +52,11 @@ static u32 drm_hdcp_get_revoked_ksv_count(const u8 *buf, u32 vrls_length)
return ksv_count;
}
-static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 *revoked_ksv_list,
+static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 **revoked_ksv_list,
u32 vrls_length)
{
- u32 parsed_bytes = 0, ksv_count = 0;
u32 vrl_ksv_cnt, vrl_ksv_sz, vrl_idx = 0;
+ u32 parsed_bytes = 0, ksv_count = 0;
do {
vrl_ksv_cnt = *buf;
@@ -74,10 +66,10 @@ static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 *revoked_ksv_list,
DRM_DEBUG("vrl: %d, Revoked KSVs: %d\n", vrl_idx++,
vrl_ksv_cnt);
- memcpy(revoked_ksv_list, buf, vrl_ksv_sz);
+ memcpy((*revoked_ksv_list) + (ksv_count * DRM_HDCP_KSV_LEN),
+ buf, vrl_ksv_sz);
ksv_count += vrl_ksv_cnt;
- revoked_ksv_list += vrl_ksv_sz;
buf += vrl_ksv_sz;
parsed_bytes += (vrl_ksv_sz + 1);
@@ -91,7 +83,8 @@ static inline u32 get_vrl_length(const u8 *buf)
return drm_hdcp_be24_to_cpu(buf);
}
-static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count)
+static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
struct hdcp_srm_header *header;
u32 vrl_length, ksv_count;
@@ -131,29 +124,28 @@ static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count)
ksv_count = drm_hdcp_get_revoked_ksv_count(buf, vrl_length);
if (!ksv_count) {
DRM_DEBUG("Revoked KSV count is 0\n");
- return count;
+ return 0;
}
- kfree(srm_data->revoked_ksv_list);
- srm_data->revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN,
- GFP_KERNEL);
- if (!srm_data->revoked_ksv_list) {
+ *revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL);
+ if (!*revoked_ksv_list) {
DRM_ERROR("Out of Memory\n");
return -ENOMEM;
}
- if (drm_hdcp_get_revoked_ksvs(buf, srm_data->revoked_ksv_list,
+ if (drm_hdcp_get_revoked_ksvs(buf, revoked_ksv_list,
vrl_length) != ksv_count) {
- srm_data->revoked_ksv_cnt = 0;
- kfree(srm_data->revoked_ksv_list);
+ *revoked_ksv_cnt = 0;
+ kfree(*revoked_ksv_list);
return -EINVAL;
}
- srm_data->revoked_ksv_cnt = ksv_count;
- return count;
+ *revoked_ksv_cnt = ksv_count;
+ return 0;
}
-static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count)
+static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
struct hdcp_srm_header *header;
u32 vrl_length, ksv_count, ksv_sz;
@@ -195,13 +187,11 @@ static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count)
ksv_count = (*buf << 2) | DRM_HDCP_2_KSV_COUNT_2_LSBITS(*(buf + 1));
if (!ksv_count) {
DRM_DEBUG("Revoked KSV count is 0\n");
- return count;
+ return 0;
}
- kfree(srm_data->revoked_ksv_list);
- srm_data->revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN,
- GFP_KERNEL);
- if (!srm_data->revoked_ksv_list) {
+ *revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL);
+ if (!*revoked_ksv_list) {
DRM_ERROR("Out of Memory\n");
return -ENOMEM;
}
@@ -210,10 +200,10 @@ static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count)
buf += DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ;
DRM_DEBUG("Revoked KSVs: %d\n", ksv_count);
- memcpy(srm_data->revoked_ksv_list, buf, ksv_sz);
+ memcpy(*revoked_ksv_list, buf, ksv_sz);
- srm_data->revoked_ksv_cnt = ksv_count;
- return count;
+ *revoked_ksv_cnt = ksv_count;
+ return 0;
}
static inline bool is_srm_version_hdcp1(const u8 *buf)
@@ -226,22 +216,27 @@ static inline bool is_srm_version_hdcp2(const u8 *buf)
return *buf == (u8)(DRM_HDCP_2_SRM_ID << 4 | DRM_HDCP_2_INDICATOR);
}
-static void drm_hdcp_srm_update(const u8 *buf, size_t count)
+static int drm_hdcp_srm_update(const u8 *buf, size_t count,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
if (count < sizeof(struct hdcp_srm_header))
- return;
+ return -EINVAL;
if (is_srm_version_hdcp1(buf))
- drm_hdcp_parse_hdcp1_srm(buf, count);
+ return drm_hdcp_parse_hdcp1_srm(buf, count, revoked_ksv_list,
+ revoked_ksv_cnt);
else if (is_srm_version_hdcp2(buf))
- drm_hdcp_parse_hdcp2_srm(buf, count);
+ return drm_hdcp_parse_hdcp2_srm(buf, count, revoked_ksv_list,
+ revoked_ksv_cnt);
+ else
+ return -EINVAL;
}
-static void drm_hdcp_request_srm(struct drm_device *drm_dev)
+static int drm_hdcp_request_srm(struct drm_device *drm_dev,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
{
char fw_name[36] = "display_hdcp_srm.bin";
const struct firmware *fw;
-
int ret;
ret = request_firmware_direct(&fw, (const char *)fw_name,
@@ -250,10 +245,12 @@ static void drm_hdcp_request_srm(struct drm_device *drm_dev)
goto exit;
if (fw->size && fw->data)
- drm_hdcp_srm_update(fw->data, fw->size);
+ ret = drm_hdcp_srm_update(fw->data, fw->size, revoked_ksv_list,
+ revoked_ksv_cnt);
exit:
release_firmware(fw);
+ return ret;
}
/**
@@ -279,71 +276,34 @@ exit:
* https://www.digital-cp.com/sites/default/files/specifications/HDCP%20on%20HDMI%20Specification%20Rev2_2_Final1.pdf
*
* Returns:
- * TRUE on any of the KSV is revoked, else FALSE.
+ * Count of the revoked KSVs or -ve error number incase of the failure.
*/
-bool drm_hdcp_check_ksvs_revoked(struct drm_device *drm_dev, u8 *ksvs,
- u32 ksv_count)
+int drm_hdcp_check_ksvs_revoked(struct drm_device *drm_dev, u8 *ksvs,
+ u32 ksv_count)
{
- u32 rev_ksv_cnt, cnt, i, j;
- u8 *rev_ksv_list;
-
- if (!srm_data)
- return false;
-
- mutex_lock(&srm_data->mutex);
- drm_hdcp_request_srm(drm_dev);
-
- rev_ksv_cnt = srm_data->revoked_ksv_cnt;
- rev_ksv_list = srm_data->revoked_ksv_list;
-
- /* If the Revoked ksv list is empty */
- if (!rev_ksv_cnt || !rev_ksv_list) {
- mutex_unlock(&srm_data->mutex);
- return false;
- }
-
- for (cnt = 0; cnt < ksv_count; cnt++) {
- rev_ksv_list = srm_data->revoked_ksv_list;
- for (i = 0; i < rev_ksv_cnt; i++) {
- for (j = 0; j < DRM_HDCP_KSV_LEN; j++)
- if (ksvs[j] != rev_ksv_list[j]) {
- break;
- } else if (j == (DRM_HDCP_KSV_LEN - 1)) {
- DRM_DEBUG("Revoked KSV is ");
- drm_hdcp_print_ksv(ksvs);
- mutex_unlock(&srm_data->mutex);
- return true;
- }
- /* Move the offset to next KSV in the revoked list */
- rev_ksv_list += DRM_HDCP_KSV_LEN;
- }
-
- /* Iterate to next ksv_offset */
- ksvs += DRM_HDCP_KSV_LEN;
- }
- mutex_unlock(&srm_data->mutex);
- return false;
+ u32 revoked_ksv_cnt = 0, i, j;
+ u8 *revoked_ksv_list = NULL;
+ int ret = 0;
+
+ ret = drm_hdcp_request_srm(drm_dev, &revoked_ksv_list,
+ &revoked_ksv_cnt);
+
+ /* revoked_ksv_cnt will be zero when above function failed */
+ for (i = 0; i < revoked_ksv_cnt; i++)
+ for (j = 0; j < ksv_count; j++)
+ if (!memcmp(&ksvs[j * DRM_HDCP_KSV_LEN],
+ &revoked_ksv_list[i * DRM_HDCP_KSV_LEN],
+ DRM_HDCP_KSV_LEN)) {
+ DRM_DEBUG("Revoked KSV is ");
+ drm_hdcp_print_ksv(&ksvs[j * DRM_HDCP_KSV_LEN]);
+ ret++;
+ }
+
+ kfree(revoked_ksv_list);
+ return ret;
}
EXPORT_SYMBOL_GPL(drm_hdcp_check_ksvs_revoked);
-int drm_setup_hdcp_srm(struct class *drm_class)
-{
- srm_data = kzalloc(sizeof(*srm_data), GFP_KERNEL);
- if (!srm_data)
- return -ENOMEM;
- mutex_init(&srm_data->mutex);
-
- return 0;
-}
-
-void drm_teardown_hdcp_srm(struct class *drm_class)
-{
- if (srm_data) {
- kfree(srm_data->revoked_ksv_list);
- kfree(srm_data);
- }
-}
-
static struct drm_prop_enum_list drm_cp_enum_list[] = {
{ DRM_MODE_CONTENT_PROTECTION_UNDESIRED, "Undesired" },
{ DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" },
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-28 18:53:06 +0000