[PATCH] drm/amd/amdgpu: New debugfs interface for MMIO registers
Tom St Denis
tom.stdenis at amd.com
Tue Aug 24 12:16:18 UTC 2021
This new debugfs interface uses an IOCTL interface in order to pass
along state information like SRBM and GRBM bank switching. This
new interface also allows a full 32-bit MMIO address range which
the previous didn't. With this new design we have room to grow
the flexibility of the file as need be.
Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 177 ++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h | 32 ++++
2 files changed, 209 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 277128846dd1..ab2d92f84da5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -279,6 +279,173 @@ static ssize_t amdgpu_debugfs_regs_write(struct file *f, const char __user *buf,
return amdgpu_debugfs_process_reg_op(false, f, (char __user *)buf, size, pos);
}
+static int amdgpu_debugfs_regs2_open(struct inode *inode, struct file *file)
+{
+ struct amdgpu_debugfs_regs2_data *rd;
+
+ rd = kzalloc(sizeof *rd, GFP_KERNEL);
+ if (!rd)
+ return -ENOMEM;
+ rd->adev = file_inode(file)->i_private;
+ file->private_data = rd;
+
+ return 0;
+}
+
+static int amdgpu_debugfs_regs2_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static int amdgpu_debugfs_regs2_op(struct file *f, char __user *buf, int write_en)
+{
+ struct amdgpu_debugfs_regs2_data *rd = f->private_data;
+ struct amdgpu_device *adev = rd->adev;
+ int result = 0, r;
+ uint32_t value;
+
+ if (rd->state.offset & 0x3)
+ return -EINVAL;
+
+ if (rd->state.use_grbm) {
+ if (rd->state.grbm.se == 0x3FF)
+ rd->state.grbm.se = 0xFFFFFFFF;
+ if (rd->state.grbm.sh == 0x3FF)
+ rd->state.grbm.sh = 0xFFFFFFFF;
+ if (rd->state.grbm.instance == 0x3FF)
+ rd->state.grbm.instance = 0xFFFFFFFF;
+ }
+
+ r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
+ if (r < 0) {
+ pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+ return r;
+ }
+
+ r = amdgpu_virt_enable_access_debugfs(adev);
+ if (r < 0) {
+ pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+ return r;
+ }
+
+ if (rd->state.use_grbm) {
+ if ((rd->state.grbm.sh != 0xFFFFFFFF && rd->state.grbm.sh >= adev->gfx.config.max_sh_per_se) ||
+ (rd->state.grbm.se != 0xFFFFFFFF && rd->state.grbm.se >= adev->gfx.config.max_shader_engines)) {
+ pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
+ pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+ amdgpu_virt_disable_access_debugfs(adev);
+ return -EINVAL;
+ }
+ mutex_lock(&adev->grbm_idx_mutex);
+ amdgpu_gfx_select_se_sh(adev, rd->state.grbm.se,
+ rd->state.grbm.sh,
+ rd->state.grbm.instance);
+ } else if (rd->state.use_grbm) {
+ mutex_lock(&adev->srbm_mutex);
+ amdgpu_gfx_select_me_pipe_q(adev, rd->state.srbm.me, rd->state.srbm.pipe,
+ rd->state.srbm.queue, rd->state.srbm.vmid);
+ }
+
+ if (rd->state.pg_lock)
+ mutex_lock(&adev->pm.mutex);
+
+ if (!write_en) {
+ value = RREG32(rd->state.offset >> 2);
+ r = put_user(value, (uint32_t *)buf);
+ } else {
+ r = get_user(value, (uint32_t *)buf);
+ if (!r)
+ amdgpu_mm_wreg_mmio_rlc(adev, rd->state.offset >> 2, value);
+ }
+ if (r) {
+ result = r;
+ goto end;
+ }
+ result = 0;
+end:
+ if (rd->state.use_grbm) {
+ amdgpu_gfx_select_se_sh(adev, 0xffffffff, 0xffffffff, 0xffffffff);
+ mutex_unlock(&adev->grbm_idx_mutex);
+ } else if (rd->state.use_srbm) {
+ amdgpu_gfx_select_me_pipe_q(adev, 0, 0, 0, 0);
+ mutex_unlock(&adev->srbm_mutex);
+ }
+
+ if (rd->state.pg_lock)
+ mutex_unlock(&adev->pm.mutex);
+
+ // in umr (the likely user of this) flags are set per file operation
+ // which means they're never "unset" explicitly. To avoid breaking
+ // this convention we unset the flags after each operation
+ // flags are for a single call (need to be set for every read/write)
+ rd->state.use_grbm = 0;
+ rd->state.use_srbm = 0;
+ rd->state.pg_lock = 0;
+
+ pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
+ pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+
+ amdgpu_virt_disable_access_debugfs(adev);
+ return result;
+}
+
+static long amdgpu_debugfs_regs2_ioctl(struct file *f, unsigned int cmd, unsigned long data)
+{
+ struct amdgpu_debugfs_regs2_data *rd = f->private_data;
+ unsigned char st[32], v;
+ int r, x;
+
+ // always read first 4 bytes of data
+ for (x = 0; x < 4; x++) {
+ if ((r = get_user(v, (unsigned char *)data))) {
+ return r;
+ }
+ ++data;
+ st[x] = v;
+ }
+
+ // first 4 bytes are offset
+ rd->state.offset = ((u32)st[0]) | ((u32)st[1] << 8) |
+ ((u32)st[2] << 16) | ((u32)st[3] << 24);
+
+ switch (cmd) {
+ case AMDGPU_DEBUGFS_REGS2_IOC_SET_STATE:
+ for (x = 4; x < 32; x++) {
+ if ((r = get_user(v, (unsigned char *)data))) {
+ return r;
+ }
+ ++data;
+ st[x] = v;
+ }
+
+ // next byte contains the flag
+ // we only consume the remainder of the state if bit 1 is set
+ // this allows the subsequent read/write
+ rd->state.use_grbm = (st[4] & 1) ? 1 : 0;
+ rd->state.use_srbm = (st[4] & 2) ? 1 : 0;
+ rd->state.pg_lock = (st[4] & 4) ? 1 : 0;
+
+ // next 6 bytes are grbm data
+ rd->state.grbm.se = ((u32)st[5]) | ((u32)st[6] << 8);
+ rd->state.grbm.sh = ((u32)st[7]) | ((u32)st[8] << 8);
+ rd->state.grbm.instance = ((u32)st[9]) | ((u32)st[10] << 8);
+
+ // next 8 are srbm data
+ rd->state.srbm.me = ((u32)st[11]) | ((u32)st[12] << 8);
+ rd->state.srbm.pipe = ((u32)st[13]) | ((u32)st[14] << 8);
+ rd->state.srbm.queue = ((u32)st[15]) | ((u32)st[16] << 8);
+ rd->state.srbm.vmid = ((u32)st[17]) | ((u32)st[18] << 8);
+ break;
+ case AMDGPU_DEBUGFS_REGS2_IOC_READ:
+ return amdgpu_debugfs_regs2_op(f, (char __user *)data, 0);
+ case AMDGPU_DEBUGFS_REGS2_IOC_WRITE:
+ return amdgpu_debugfs_regs2_op(f, (char __user *)data, 1);
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
/**
* amdgpu_debugfs_regs_pcie_read - Read from a PCIE register
@@ -1091,6 +1258,14 @@ static ssize_t amdgpu_debugfs_gfxoff_read(struct file *f, char __user *buf,
return result;
}
+static const struct file_operations amdgpu_debugfs_regs2_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = amdgpu_debugfs_regs2_ioctl,
+ .open = amdgpu_debugfs_regs2_open,
+ .release = amdgpu_debugfs_regs2_release,
+ .llseek = default_llseek
+};
+
static const struct file_operations amdgpu_debugfs_regs_fops = {
.owner = THIS_MODULE,
.read = amdgpu_debugfs_regs_read,
@@ -1148,6 +1323,7 @@ static const struct file_operations amdgpu_debugfs_gfxoff_fops = {
static const struct file_operations *debugfs_regs[] = {
&amdgpu_debugfs_regs_fops,
+ &amdgpu_debugfs_regs2_fops,
&amdgpu_debugfs_regs_didt_fops,
&amdgpu_debugfs_regs_pcie_fops,
&amdgpu_debugfs_regs_smc_fops,
@@ -1160,6 +1336,7 @@ static const struct file_operations *debugfs_regs[] = {
static const char *debugfs_regs_names[] = {
"amdgpu_regs",
+ "amdgpu_regs2",
"amdgpu_regs_didt",
"amdgpu_regs_pcie",
"amdgpu_regs_smc",
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
index 141a8474e24f..04c81cd4bcc7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
@@ -22,6 +22,7 @@
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
+#include <linux/ioctl.h>
/*
* Debugfs
@@ -38,3 +39,34 @@ void amdgpu_debugfs_fence_init(struct amdgpu_device *adev);
void amdgpu_debugfs_firmware_init(struct amdgpu_device *adev);
void amdgpu_debugfs_gem_init(struct amdgpu_device *adev);
int amdgpu_debugfs_wait_dump(struct amdgpu_device *adev);
+
+struct amdgpu_debugfs_regs2_data {
+ struct amdgpu_device *adev;
+ struct {
+ // regs state
+ int use_srbm,
+ use_grbm,
+ pg_lock;
+ struct {
+ u32 se, sh, instance;
+ } grbm;
+ struct {
+ u32 me, pipe, queue, vmid;
+ } srbm;
+ u32 offset;
+ } state;
+};
+
+enum AMDGPU_DEBUGFS_REGS2_CMDS {
+ AMDGPU_DEBUGFS_REGS2_CMD_SET_STATE=0,
+ AMDGPU_DEBUGFS_REGS2_CMD_READ,
+ AMDGPU_DEBUGFS_REGS2_CMD_WRITE,
+};
+
+struct amdgpu_debugfs_regs2_iocdata {
+ unsigned char t[32];
+};
+
+#define AMDGPU_DEBUGFS_REGS2_IOC_SET_STATE _IOWR(0x20, AMDGPU_DEBUGFS_REGS2_CMD_SET_STATE, struct amdgpu_debugfs_regs2_iocdata)
+#define AMDGPU_DEBUGFS_REGS2_IOC_READ _IOWR(0x20, AMDGPU_DEBUGFS_REGS2_CMD_WRITE, struct amdgpu_debugfs_regs2_iocdata)
+#define AMDGPU_DEBUGFS_REGS2_IOC_WRITE _IOWR(0x20, AMDGPU_DEBUGFS_REGS2_CMD_READ, struct amdgpu_debugfs_regs2_iocdata)
--
2.31.1
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