Am 08.10.19 um 21:29 schrieb Alex Deucher:
From: "Tianci.Yin" <tianci....@amd.com>
add a generic helper function for accessing framebuffer via MMIO
Change-Id: I4baa0aa53c93a94c2eff98c6211a61f369239982
Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Tianci.Yin <tianci....@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 42 +++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 13 +-----
3 files changed, 45 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 17ccb9015141..0d60c2e6c592 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -985,6 +985,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
void amdgpu_device_fini(struct amdgpu_device *adev);
int amdgpu_gpu_wait_for_idle(struct amdgpu_device *adev);
+int amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
+ uint32_t *buf, size_t size, bool write);
uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
uint32_t acc_flags);
void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index f25275abf408..53ce227f759c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -153,6 +153,48 @@ bool amdgpu_device_is_px(struct drm_device *dev)
return false;
}
+/**
+ * VRAM access helper functions.
+ *
+ * amdgpu_device_vram_access - read/write a buffer in vram
+ *
+ * @adev: amdgpu_device pointer
+ * @pos: offset of the buffer in vram
+ * @buf: virtual address of the buffer in system memory
+ * @size: read/write size, sizeof(@buf) must > @size
+ * @write: true - write to vram, otherwise - read from vram
+ *
+ * Returns 0 on success or an -error on failure.
+ */
+int amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
+ uint32_t *buf, size_t size, bool write)
Indentation seems to be incorrect here.
+{
+ uint64_t end = pos + size;
+ unsigned long flags;
+
+ if (IS_ERR_OR_NULL(buf) ||
+ (adev->gmc.mc_vram_size > 0 &&
+ end > adev->gmc.mc_vram_size)) {
+ DRM_ERROR("parameter error! pos:%llx, buf:%llx, size:%zx.\n",
+ pos, (u64)buf, size);
+ return -EINVAL;
+ }
Please drop that, this is a purely internal functions and parameter
checking like this doesn't really make sense.
Regards,
Christian.
+
+ while (pos < end) {
+ spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+ WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)pos) | 0x80000000);
+ WREG32_NO_KIQ(mmMM_INDEX_HI, pos >> 31);
+ if (write)
+ WREG32_NO_KIQ(mmMM_DATA, *buf++);
+ else
+ *buf++ = RREG32_NO_KIQ(mmMM_DATA);
+ spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+ pos += 4;
+ }
+
+ return 0;
+}
+
/*
* MMIO register access helper functions.
*/
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index db2dab3a6dff..324c2d605f54 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -134,21 +134,10 @@ static int hw_id_map[MAX_HWIP] = {
static int amdgpu_discovery_read_binary(struct amdgpu_device *adev, uint8_t *binary)
{
- uint32_t *p = (uint32_t *)binary;
uint64_t vram_size = (uint64_t)RREG32(mmRCC_CONFIG_MEMSIZE) << 20;
uint64_t pos = vram_size - BINARY_MAX_SIZE;
- unsigned long flags;
-
- while (pos < vram_size) {
- spin_lock_irqsave(&adev->mmio_idx_lock, flags);
- WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)pos) | 0x80000000);
- WREG32_NO_KIQ(mmMM_INDEX_HI, pos >> 31);
- *p++ = RREG32_NO_KIQ(mmMM_DATA);
- spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
- pos += 4;
- }
- return 0;
+ return amdgpu_device_vram_access(adev, pos, (uint32_t *)binary,
BINARY_MAX_SIZE, false);
}
static uint16_t amdgpu_discovery_calculate_checksum(uint8_t *data, uint32_t size)
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