Commit be8325fb authored by Shyam Sundar S K's avatar Shyam Sundar S K Committed by Hans de Goede
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platform/x86/amd: pmc: Get STB DRAM size from PMFW 



Recent PMFW's have support for querying the STB DRAM size. Add this
support to the driver.

Reviewed-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
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/20230525141929.866385-3-Shyam-sundar.S-k@amd.com


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent a0d61b07

drivers/platform/x86/amd/pmc.c

+36 −1
Original line number Diff line number Diff line
@@ -115,6 +115,7 @@ enum s2d_arg { 
	S2D_PHYS_ADDR_LOW,

	S2D_PHYS_ADDR_HIGH,

	S2D_NUM_SAMPLES,

	S2D_DRAM_SIZE,

};



struct amd_pmc_bit_map {
@@ -147,6 +148,7 @@ struct amd_pmc_dev { 
	u32 base_addr;

	u32 cpu_id;

	u32 active_ips;

	u32 dram_size;

/* SMU version information */

	u8 smu_program;

	u8 major;
@@ -890,11 +892,39 @@ static const struct pci_device_id pmc_pci_ids[] = { 
	{ }

};



static int amd_pmc_get_dram_size(struct amd_pmc_dev *dev)

{

	int ret;



	switch (dev->cpu_id) {

	case AMD_CPU_ID_YC:

		if (!(dev->major > 90 || (dev->major == 90 && dev->minor > 39))) {

			ret = -EINVAL;

			goto err_dram_size;

		}

		break;

	default:

		ret = -EINVAL;

		goto err_dram_size;

	}



	ret = amd_pmc_send_cmd(dev, S2D_DRAM_SIZE, &dev->dram_size, STB_SPILL_TO_DRAM, true);

	if (ret || !dev->dram_size)

		goto err_dram_size;



	return 0;



err_dram_size:

	dev_err(dev->dev, "DRAM size command not supported for this platform\n");

	return ret;

}



static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)

{

	u32 phys_addr_low, phys_addr_hi;

	u64 stb_phys_addr;

	u32 size = 0;

	int ret;



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

	dev->msg_port = 1;
@@ -903,6 +933,11 @@ static int amd_pmc_s2d_init(struct amd_pmc_dev *dev) 
	if (size != S2D_TELEMETRY_BYTES_MAX)

		return -EIO;



	/* Get DRAM size */

	ret = amd_pmc_get_dram_size(dev);

	if (ret)

		dev->dram_size = S2D_TELEMETRY_DRAMBYTES_MAX;



	/* Get STB DRAM address */

	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_LOW, &phys_addr_low, STB_SPILL_TO_DRAM, true);

	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_HIGH, &phys_addr_hi, STB_SPILL_TO_DRAM, true);
@@ -912,7 +947,7 @@ static int amd_pmc_s2d_init(struct amd_pmc_dev *dev) 
	/* Clear msg_port for other SMU operation */

	dev->msg_port = 0;



	dev->stb_virt_addr = devm_ioremap(dev->dev, stb_phys_addr, S2D_TELEMETRY_DRAMBYTES_MAX);

	dev->stb_virt_addr = devm_ioremap(dev->dev, stb_phys_addr, dev->dram_size);

	if (!dev->stb_virt_addr)

		return -ENOMEM;