[PATCH 1/3] drm/amd/amdgpu: Add debugfs support for reading GPRs
Tom St Denis
tstdenis82 at gmail.com
Mon Dec 5 18:36:50 UTC 2016
Implemented for SGPRs for GFX v8 initially.
Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 72 ++++++++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 25 +++++++++++
3 files changed, 99 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 4f64bb16a8d3..2834451eef8a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -844,6 +844,8 @@ struct amdgpu_gfx_funcs {
uint64_t (*get_gpu_clock_counter)(struct amdgpu_device *adev);
void (*select_se_sh)(struct amdgpu_device *adev, u32 se_num, u32 sh_num, u32 instance);
void (*read_wave_data)(struct amdgpu_device *adev, uint32_t simd, uint32_t wave, uint32_t *dst, int *no_fields);
+ void (*read_wave_vgprs)(struct amdgpu_device *adev, uint32_t simd, uint32_t wave, uint32_t thread, uint32_t start, uint32_t size, uint32_t *dst);
+ void (*read_wave_sgprs)(struct amdgpu_device *adev, uint32_t simd, uint32_t wave, uint32_t start, uint32_t size, uint32_t *dst);
};
struct amdgpu_gfx {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 25ad736b5ca5..7f9cb1c85d75 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3055,6 +3055,71 @@ static ssize_t amdgpu_debugfs_wave_read(struct file *f, char __user *buf,
return result;
}
+static ssize_t amdgpu_debugfs_gpr_read(struct file *f, char __user *buf,
+ size_t size, loff_t *pos)
+{
+ struct amdgpu_device *adev = f->f_inode->i_private;
+ int r;
+ ssize_t result=0;
+ uint32_t offset, se, sh, cu, wave, simd, thread, bank, *data;
+
+ if (size & 3 || *pos & 3)
+ return -EINVAL;
+
+ /* decode offset */
+ offset = (*pos & 0xFFF);
+ se = ((*pos >> 12) & 0xFF);
+ sh = ((*pos >> 20) & 0xFF);
+ cu = ((*pos >> 28) & 0xFF);
+ wave = ((*pos >> 36) & 0xFF);
+ simd = ((*pos >> 44) & 0xFF);
+ thread = ((*pos >> 52) & 0xFF);
+ bank = ((*pos >> 60) & 1);
+
+ /* sanity check offset/size */
+ if (offset + size > (adev->gfx.config.max_gprs << 2))
+ return -EINVAL;
+
+ data = kmalloc_array(1024, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* switch to the specific se/sh/cu */
+ mutex_lock(&adev->grbm_idx_mutex);
+ amdgpu_gfx_select_se_sh(adev, se, sh, cu);
+
+ if (bank == 0) {
+ if (adev->gfx.funcs->read_wave_vgprs)
+ adev->gfx.funcs->read_wave_vgprs(adev, simd, wave, thread, offset>>2, size>>2, data);
+ } else {
+ if (adev->gfx.funcs->read_wave_sgprs)
+ adev->gfx.funcs->read_wave_sgprs(adev, simd, wave, offset>>2, size>>2, data);
+ }
+
+ amdgpu_gfx_select_se_sh(adev, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
+ mutex_unlock(&adev->grbm_idx_mutex);
+
+ while (size) {
+ uint32_t value;
+
+ value = data[offset >> 2];
+ r = put_user(value, (uint32_t *)buf);
+ if (r) {
+ result = r;
+ goto err;
+ }
+
+ result += 4;
+ buf += 4;
+ offset += 4;
+ size -= 4;
+ }
+
+err:
+ kfree(data);
+ return result;
+}
+
static const struct file_operations amdgpu_debugfs_regs_fops = {
.owner = THIS_MODULE,
.read = amdgpu_debugfs_regs_read,
@@ -3097,6 +3162,11 @@ static const struct file_operations amdgpu_debugfs_wave_fops = {
.read = amdgpu_debugfs_wave_read,
.llseek = default_llseek
};
+static const struct file_operations amdgpu_debugfs_gpr_fops = {
+ .owner = THIS_MODULE,
+ .read = amdgpu_debugfs_gpr_read,
+ .llseek = default_llseek
+};
static const struct file_operations *debugfs_regs[] = {
&amdgpu_debugfs_regs_fops,
@@ -3106,6 +3176,7 @@ static const struct file_operations *debugfs_regs[] = {
&amdgpu_debugfs_gca_config_fops,
&amdgpu_debugfs_sensors_fops,
&amdgpu_debugfs_wave_fops,
+ &amdgpu_debugfs_gpr_fops,
};
static const char *debugfs_regs_names[] = {
@@ -3116,6 +3187,7 @@ static const char *debugfs_regs_names[] = {
"amdgpu_gca_config",
"amdgpu_sensors",
"amdgpu_wave",
+ "amdgpu_gpr",
};
static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 9b8d3fe67adb..180309f5784c 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -5184,6 +5184,21 @@ static uint32_t wave_read_ind(struct amdgpu_device *adev, uint32_t simd, uint32_
return RREG32(mmSQ_IND_DATA);
}
+static void wave_read_regs(struct amdgpu_device *adev, uint32_t simd,
+ uint32_t wave, uint32_t thread,
+ uint32_t regno, uint32_t num, uint32_t *out)
+{
+ WREG32(mmSQ_IND_INDEX,
+ (wave << SQ_IND_INDEX__WAVE_ID__SHIFT) |
+ (simd << SQ_IND_INDEX__SIMD_ID__SHIFT) |
+ (regno << SQ_IND_INDEX__INDEX__SHIFT) |
+ (thread << SQ_IND_INDEX__THREAD_ID__SHIFT) |
+ (SQ_IND_INDEX__FORCE_READ_MASK) |
+ (SQ_IND_INDEX__AUTO_INCR_MASK));
+ while (num--)
+ *(out++) = RREG32(mmSQ_IND_DATA);
+}
+
static void gfx_v8_0_read_wave_data(struct amdgpu_device *adev, uint32_t simd, uint32_t wave, uint32_t *dst, int *no_fields)
{
/* type 0 wave data */
@@ -5208,11 +5223,21 @@ static void gfx_v8_0_read_wave_data(struct amdgpu_device *adev, uint32_t simd, u
dst[(*no_fields)++] = wave_read_ind(adev, simd, wave, ixSQ_WAVE_M0);
}
+static void gfx_v8_0_read_wave_sgprs(struct amdgpu_device *adev, uint32_t simd,
+ uint32_t wave, uint32_t start,
+ uint32_t size, uint32_t *dst)
+{
+ wave_read_regs(
+ adev, simd, wave, 0,
+ start + SQIND_WAVE_SGPRS_OFFSET, size, dst);
+}
+
static const struct amdgpu_gfx_funcs gfx_v8_0_gfx_funcs = {
.get_gpu_clock_counter = &gfx_v8_0_get_gpu_clock_counter,
.select_se_sh = &gfx_v8_0_select_se_sh,
.read_wave_data = &gfx_v8_0_read_wave_data,
+ .read_wave_sgprs = &gfx_v8_0_read_wave_sgprs,
};
static int gfx_v8_0_early_init(void *handle)
--
2.10.0
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