drm/radeon/kms: prevent parallel AtomBIOS calls

This just adds a mutex around the atombios table execution
so we don't call it from two contexts at once.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 12 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index 6578d19dff93..388140a7e651 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -58,6 +58,7 @@ typedef struct {
 } atom_exec_context;
 
 int atom_debug = 0;
+static void atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t * params);
 void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params);
 
 static uint32_t atom_arg_mask[8] =
@@ -573,7 +574,7 @@ static void atom_op_calltable(atom_exec_context *ctx, int *ptr, int arg)
         else
                 SDEBUG("   table: %d\n", idx);
         if (U16(ctx->ctx->cmd_table + 4 + 2 * idx))
-                atom_execute_table(ctx->ctx, idx, ctx->ps + ctx->ps_shift);
+                atom_execute_table_locked(ctx->ctx, idx, ctx->ps + ctx->ps_shift);
 }
 
 static void atom_op_clear(atom_exec_context *ctx, int *ptr, int arg)
@@ -1040,7 +1041,7 @@ static struct {
         atom_op_shr, ATOM_ARG_MC}, {
 atom_op_debug, 0},};
 
-void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params)
+static void atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t * params)
 {
         int base = CU16(ctx->cmd_table + 4 + 2 * index);
         int len, ws, ps, ptr;
@@ -1092,6 +1093,13 @@ void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params)
                 kfree(ectx.ws);
 }
 
+void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params)
+{
+        mutex_lock(&ctx->mutex);
+        atom_execute_table_locked(ctx, index, params);
+        mutex_unlock(&ctx->mutex);
+}
+
 static int atom_iio_len[] = { 1, 2, 3, 3, 3, 3, 4, 4, 4, 3 };
 
 static void atom_index_iio(struct atom_context *ctx, int base)
diff --git a/drivers/gpu/drm/radeon/atom.h b/drivers/gpu/drm/radeon/atom.h
index 6671848e5ea1..47fd943f6d14 100644
--- a/drivers/gpu/drm/radeon/atom.h
+++ b/drivers/gpu/drm/radeon/atom.h
@@ -120,6 +120,7 @@ struct card_info {
 
 struct atom_context {
         struct card_info *card;
+        struct mutex mutex;
         void *bios;
         uint32_t cmd_table, data_table;
         uint16_t *iio;
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 02bcdb1240c0..99b95ca42a71 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -481,6 +481,7 @@ int radeon_atombios_init(struct radeon_device *rdev)
         atom_card_info->pll_write = cail_pll_write;
 
         rdev->mode_info.atom_context = atom_parse(atom_card_info, rdev->bios);
+        mutex_init(&rdev->mode_info.atom_context->mutex);
         radeon_atom_initialize_bios_scratch_regs(rdev->ddev);
         atom_allocate_fb_scratch(rdev->mode_info.atom_context);
         return 0;