Keep in mind that under SRIOV you can read registers while in atomic
context, e.g. while holding a spinlock.
Please double check if that won't bite us.
Apart from that the change looks good to me,
Christian.
Am 30.05.2018 um 12:19 schrieb Shirish S:
mutex's lead to sleeps which should be avoided in
atomic context.
Hence this patch replaces it with the spin_locks.
Signed-off-by: Shirish S <shiris...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 2 +-
drivers/gpu/drm/amd/amdgpu/atom.c | 4 ++--
drivers/gpu/drm/amd/amdgpu/atom.h | 3 ++-
3 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
index bf872f6..ba3d4b9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
@@ -2033,7 +2033,7 @@ int amdgpu_atombios_init(struct amdgpu_device *adev)
return -ENOMEM;
}
- mutex_init(&adev->mode_info.atom_context->mutex);
+ spin_lock_init(&adev->mode_info.atom_context->lock);
if (adev->is_atom_fw) {
amdgpu_atomfirmware_scratch_regs_init(adev);
amdgpu_atomfirmware_allocate_fb_scratch(adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c
b/drivers/gpu/drm/amd/amdgpu/atom.c
index 69500a8..bfd98f0 100644
--- a/drivers/gpu/drm/amd/amdgpu/atom.c
+++ b/drivers/gpu/drm/amd/amdgpu/atom.c
@@ -1261,7 +1261,7 @@ int amdgpu_atom_execute_table(struct atom_context *ctx,
int index, uint32_t * pa
{
int r;
- mutex_lock(&ctx->mutex);
+ spin_lock(&ctx->lock);
/* reset data block */
ctx->data_block = 0;
/* reset reg block */
@@ -1274,7 +1274,7 @@ int amdgpu_atom_execute_table(struct atom_context *ctx,
int index, uint32_t * pa
ctx->divmul[0] = 0;
ctx->divmul[1] = 0;
r = amdgpu_atom_execute_table_locked(ctx, index, params);
- mutex_unlock(&ctx->mutex);
+ spin_unlock(&ctx->lock);
return r;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/atom.h b/drivers/gpu/drm/amd/amdgpu/atom.h
index a391709..cdfb0d0 100644
--- a/drivers/gpu/drm/amd/amdgpu/atom.h
+++ b/drivers/gpu/drm/amd/amdgpu/atom.h
@@ -26,6 +26,7 @@
#define ATOM_H
#include <linux/types.h>
+#include <linux/spinlock_types.h>
#include <drm/drmP.h>
#define ATOM_BIOS_MAGIC 0xAA55
@@ -125,7 +126,7 @@ struct card_info {
struct atom_context {
struct card_info *card;
- struct mutex mutex;
+ spinlock_t lock;
void *bios;
uint32_t cmd_table, data_table;
uint16_t *iio;
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