Commit 1ecfd309 authored by Shyam Sundar S K's avatar Shyam Sundar S K Committed by Hans de Goede
Browse files

platform/x86/amd: pmc: Add num_samples message id support to STB 



Recent PMFWs have the support for S2D_NUM_SAMPLES message ID that
can tell the current number of samples present within the STB DRAM.

num_samples returned would let the driver know the start of the read
from the last push location. This way, the driver would emit the
top most region of the STB DRAM.

Co-developed-by: default avatarSanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: default avatarSanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: default avatarShyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20230206150855.1938810-2-Shyam-sundar.S-k@amd.com


Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 4ca26e56

drivers/platform/x86/amd/pmc.c

+25 −2
Original line number Diff line number Diff line
@@ -114,6 +114,7 @@ enum s2d_arg { 
	S2D_TELEMETRY_SIZE = 0x01,

	S2D_PHYS_ADDR_LOW,

	S2D_PHYS_ADDR_HIGH,

	S2D_NUM_SAMPLES,

};



struct amd_pmc_bit_map {
@@ -246,13 +247,35 @@ static const struct file_operations amd_pmc_stb_debugfs_fops = { 
static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp)

{

	struct amd_pmc_dev *dev = filp->f_inode->i_private;

	u32 *buf;

	u32 *buf, fsize, num_samples, stb_rdptr_offset = 0;

	int ret;



	buf = kzalloc(S2D_TELEMETRY_BYTES_MAX, GFP_KERNEL);

	if (!buf)

		return -ENOMEM;



	memcpy_fromio(buf, dev->stb_virt_addr, S2D_TELEMETRY_BYTES_MAX);

	/* Spill to DRAM num_samples uses separate SMU message port */

	dev->msg_port = 1;



	/* Get the num_samples to calculate the last push location */

	ret = amd_pmc_send_cmd(dev, S2D_NUM_SAMPLES, &num_samples, STB_SPILL_TO_DRAM, 1);

	/* Clear msg_port for other SMU operation */

	dev->msg_port = 0;

	if (ret) {

		dev_err(dev->dev, "error: S2D_NUM_SAMPLES not supported : %d\n", ret);

		return ret;

	}



	/* Start capturing data from the last push location */

	if (num_samples > S2D_TELEMETRY_BYTES_MAX) {

		fsize  = S2D_TELEMETRY_BYTES_MAX;

		stb_rdptr_offset = num_samples - fsize;

	} else {

		fsize = num_samples;

		stb_rdptr_offset = 0;

	}



	memcpy_fromio(buf, dev->stb_virt_addr + stb_rdptr_offset, fsize);

	filp->private_data = buf;



	return 0;