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PCI: rockchip: Fix window mapping and address translation for endpoint
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[ Upstream commit dc73ed0 ]

The RK3399 PCI endpoint core has 33 windows for PCIe space, now in the
driver up to 32 fixed size (1M) windows are used and pages are allocated
and mapped accordingly. The driver first used a single window and allocated
space inside which caused translation issues (between CPU space and PCI
space) because a window can only have a single translation at a given
time, which if multiple pages are allocated inside will cause conflicts.
Now each window is a single region of 1M which will always guarantee that
the translation is not in conflict.

Set the translation register addresses for physical function. As documented
in the technical reference manual (TRM) section 17.5.5 "PCIe Address
Translation" and section 17.6.8 "Address Translation Registers Description"

Link: https://lore.kernel.org/r/20230418074700.1083505-9-rick.wertenbroek@gmail.com
Fixes: cf590b0 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@rwk-git @gregkh
rwk-git authored and gregkh committed Aug 3, 2023
1 parent 3b117fd commit 7b65231
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Showing 2 changed files with 75 additions and 88 deletions.
128 changes: 55 additions & 73 deletions drivers/pci/controller/pcie-rockchip-ep.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -64,52 +64,29 @@ static void rockchip_pcie_clear_ep_ob_atu(struct rockchip_pcie *rockchip,
}

static void rockchip_pcie_prog_ep_ob_atu(struct rockchip_pcie *rockchip, u8 fn,
u32 r, u32 type, u64 cpu_addr,
u64 pci_addr, size_t size)
u32 r, u64 cpu_addr, u64 pci_addr,
size_t size)
{
u64 sz = 1ULL << fls64(size - 1);
int num_pass_bits = ilog2(sz);
u32 addr0, addr1, desc0, desc1;
bool is_nor_msg = (type == AXI_WRAPPER_NOR_MSG);
int num_pass_bits = fls64(size - 1);
u32 addr0, addr1, desc0;

/* The minimal region size is 1MB */
if (num_pass_bits < 8)
num_pass_bits = 8;

cpu_addr -= rockchip->mem_res->start;
addr0 = ((is_nor_msg ? 0x10 : (num_pass_bits - 1)) &
PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
(lower_32_bits(cpu_addr) & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
addr1 = upper_32_bits(is_nor_msg ? cpu_addr : pci_addr);
desc0 = ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN(fn) | type;
desc1 = 0;

if (is_nor_msg) {
rockchip_pcie_write(rockchip, 0,
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r));
rockchip_pcie_write(rockchip, 0,
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR1(r));
rockchip_pcie_write(rockchip, desc0,
ROCKCHIP_PCIE_AT_OB_REGION_DESC0(r));
rockchip_pcie_write(rockchip, desc1,
ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r));
} else {
/* PCI bus address region */
rockchip_pcie_write(rockchip, addr0,
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r));
rockchip_pcie_write(rockchip, addr1,
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR1(r));
rockchip_pcie_write(rockchip, desc0,
ROCKCHIP_PCIE_AT_OB_REGION_DESC0(r));
rockchip_pcie_write(rockchip, desc1,
ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r));

addr0 =
((num_pass_bits - 1) & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
(lower_32_bits(cpu_addr) &
PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
addr1 = upper_32_bits(cpu_addr);
}
addr0 = ((num_pass_bits - 1) & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
(lower_32_bits(pci_addr) & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
addr1 = upper_32_bits(pci_addr);
desc0 = ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN(fn) | AXI_WRAPPER_MEM_WRITE;

/* PCI bus address region */
rockchip_pcie_write(rockchip, addr0,
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r));
rockchip_pcie_write(rockchip, addr1,
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR1(r));
rockchip_pcie_write(rockchip, desc0,
ROCKCHIP_PCIE_AT_OB_REGION_DESC0(r));
rockchip_pcie_write(rockchip, 0,
ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r));
}

static int rockchip_pcie_ep_write_header(struct pci_epc *epc, u8 fn, u8 vfn,
Expand Down Expand Up @@ -248,26 +225,20 @@ static void rockchip_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn, u8 vfn,
ROCKCHIP_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar));
}

static inline u32 rockchip_ob_region(phys_addr_t addr)
{
return (addr >> ilog2(SZ_1M)) & 0x1f;
}

static int rockchip_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, u8 vfn,
phys_addr_t addr, u64 pci_addr,
size_t size)
{
struct rockchip_pcie_ep *ep = epc_get_drvdata(epc);
struct rockchip_pcie *pcie = &ep->rockchip;
u32 r;
u32 r = rockchip_ob_region(addr);

r = find_first_zero_bit(&ep->ob_region_map, BITS_PER_LONG);
/*
* Region 0 is reserved for configuration space and shouldn't
* be used elsewhere per TRM, so leave it out.
*/
if (r >= ep->max_regions - 1) {
dev_err(&epc->dev, "no free outbound region\n");
return -EINVAL;
}

rockchip_pcie_prog_ep_ob_atu(pcie, fn, r, AXI_WRAPPER_MEM_WRITE, addr,
pci_addr, size);
rockchip_pcie_prog_ep_ob_atu(pcie, fn, r, addr, pci_addr, size);

set_bit(r, &ep->ob_region_map);
ep->ob_addr[r] = addr;
Expand All @@ -282,15 +253,11 @@ static void rockchip_pcie_ep_unmap_addr(struct pci_epc *epc, u8 fn, u8 vfn,
struct rockchip_pcie *rockchip = &ep->rockchip;
u32 r;

for (r = 0; r < ep->max_regions - 1; r++)
for (r = 0; r < ep->max_regions; r++)
if (ep->ob_addr[r] == addr)
break;

/*
* Region 0 is reserved for configuration space and shouldn't
* be used elsewhere per TRM, so leave it out.
*/
if (r == ep->max_regions - 1)
if (r == ep->max_regions)
return;

rockchip_pcie_clear_ep_ob_atu(rockchip, r);
Expand Down Expand Up @@ -387,7 +354,8 @@ static int rockchip_pcie_ep_send_msi_irq(struct rockchip_pcie_ep *ep, u8 fn,
struct rockchip_pcie *rockchip = &ep->rockchip;
u32 flags, mme, data, data_mask;
u8 msi_count;
u64 pci_addr, pci_addr_mask = 0xff;
u64 pci_addr;
u32 r;

/* Check MSI enable bit */
flags = rockchip_pcie_read(&ep->rockchip,
Expand Down Expand Up @@ -421,21 +389,20 @@ static int rockchip_pcie_ep_send_msi_irq(struct rockchip_pcie_ep *ep, u8 fn,
ROCKCHIP_PCIE_EP_FUNC_BASE(fn) +
ROCKCHIP_PCIE_EP_MSI_CTRL_REG +
PCI_MSI_ADDRESS_LO);
pci_addr &= GENMASK_ULL(63, 2);

/* Set the outbound region if needed. */
if (unlikely(ep->irq_pci_addr != (pci_addr & ~pci_addr_mask) ||
if (unlikely(ep->irq_pci_addr != (pci_addr & PCIE_ADDR_MASK) ||
ep->irq_pci_fn != fn)) {
rockchip_pcie_prog_ep_ob_atu(rockchip, fn, ep->max_regions - 1,
AXI_WRAPPER_MEM_WRITE,
r = rockchip_ob_region(ep->irq_phys_addr);
rockchip_pcie_prog_ep_ob_atu(rockchip, fn, r,
ep->irq_phys_addr,
pci_addr & ~pci_addr_mask,
pci_addr_mask + 1);
ep->irq_pci_addr = (pci_addr & ~pci_addr_mask);
pci_addr & PCIE_ADDR_MASK,
~PCIE_ADDR_MASK + 1);
ep->irq_pci_addr = (pci_addr & PCIE_ADDR_MASK);
ep->irq_pci_fn = fn;
}

writew(data, ep->irq_cpu_addr + (pci_addr & pci_addr_mask));
writew(data, ep->irq_cpu_addr + (pci_addr & ~PCIE_ADDR_MASK));
return 0;
}

Expand Down Expand Up @@ -517,6 +484,8 @@ static int rockchip_pcie_parse_ep_dt(struct rockchip_pcie *rockchip,
if (err < 0 || ep->max_regions > MAX_REGION_LIMIT)
ep->max_regions = MAX_REGION_LIMIT;

ep->ob_region_map = 0;

err = of_property_read_u8(dev->of_node, "max-functions",
&ep->epc->max_functions);
if (err < 0)
Expand All @@ -537,7 +506,8 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
struct rockchip_pcie *rockchip;
struct pci_epc *epc;
size_t max_regions;
int err;
struct pci_epc_mem_window *windows = NULL;
int err, i;

ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
if (!ep)
Expand Down Expand Up @@ -584,15 +554,27 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
/* Only enable function 0 by default */
rockchip_pcie_write(rockchip, BIT(0), PCIE_CORE_PHY_FUNC_CFG);

err = pci_epc_mem_init(epc, rockchip->mem_res->start,
resource_size(rockchip->mem_res), PAGE_SIZE);
windows = devm_kcalloc(dev, ep->max_regions,
sizeof(struct pci_epc_mem_window), GFP_KERNEL);
if (!windows) {
err = -ENOMEM;
goto err_uninit_port;
}
for (i = 0; i < ep->max_regions; i++) {
windows[i].phys_base = rockchip->mem_res->start + (SZ_1M * i);
windows[i].size = SZ_1M;
windows[i].page_size = SZ_1M;
}
err = pci_epc_multi_mem_init(epc, windows, ep->max_regions);
devm_kfree(dev, windows);

if (err < 0) {
dev_err(dev, "failed to initialize the memory space\n");
goto err_uninit_port;
}

ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr,
SZ_128K);
SZ_1M);
if (!ep->irq_cpu_addr) {
dev_err(dev, "failed to reserve memory space for MSI\n");
err = -ENOMEM;
Expand Down
35 changes: 20 additions & 15 deletions drivers/pci/controller/pcie-rockchip.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,7 @@

#define PCIE_RC_RP_ATS_BASE 0x400000
#define PCIE_RC_CONFIG_NORMAL_BASE 0x800000
#define PCIE_EP_PF_CONFIG_REGS_BASE 0x800000
#define PCIE_RC_CONFIG_BASE 0xa00000
#define PCIE_EP_CONFIG_BASE 0xa00000
#define PCIE_EP_CONFIG_DID_VID (PCIE_EP_CONFIG_BASE + 0x00)
Expand All @@ -157,18 +158,19 @@
#define PCIE_RC_CONFIG_THP_CAP (PCIE_RC_CONFIG_BASE + 0x274)
#define PCIE_RC_CONFIG_THP_CAP_NEXT_MASK GENMASK(31, 20)

#define PCIE_ADDR_MASK 0xffffff00
#define PCIE_CORE_AXI_CONF_BASE 0xc00000
#define PCIE_CORE_OB_REGION_ADDR0 (PCIE_CORE_AXI_CONF_BASE + 0x0)
#define PCIE_CORE_OB_REGION_ADDR0_NUM_BITS 0x3f
#define PCIE_CORE_OB_REGION_ADDR0_LO_ADDR 0xffffff00
#define PCIE_CORE_OB_REGION_ADDR0_LO_ADDR PCIE_ADDR_MASK
#define PCIE_CORE_OB_REGION_ADDR1 (PCIE_CORE_AXI_CONF_BASE + 0x4)
#define PCIE_CORE_OB_REGION_DESC0 (PCIE_CORE_AXI_CONF_BASE + 0x8)
#define PCIE_CORE_OB_REGION_DESC1 (PCIE_CORE_AXI_CONF_BASE + 0xc)

#define PCIE_CORE_AXI_INBOUND_BASE 0xc00800
#define PCIE_RP_IB_ADDR0 (PCIE_CORE_AXI_INBOUND_BASE + 0x0)
#define PCIE_CORE_IB_REGION_ADDR0_NUM_BITS 0x3f
#define PCIE_CORE_IB_REGION_ADDR0_LO_ADDR 0xffffff00
#define PCIE_CORE_IB_REGION_ADDR0_LO_ADDR PCIE_ADDR_MASK
#define PCIE_RP_IB_ADDR1 (PCIE_CORE_AXI_INBOUND_BASE + 0x4)

/* Size of one AXI Region (not Region 0) */
Expand Down Expand Up @@ -233,34 +235,37 @@
#define ROCKCHIP_PCIE_EP_MSI_CTRL_ME BIT(16)
#define ROCKCHIP_PCIE_EP_MSI_CTRL_MASK_MSI_CAP BIT(24)
#define ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR 0x1
#define ROCKCHIP_PCIE_EP_FUNC_BASE(fn) (((fn) << 12) & GENMASK(19, 12))
#define ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR 0x3
#define ROCKCHIP_PCIE_EP_FUNC_BASE(fn) \
(PCIE_EP_PF_CONFIG_REGS_BASE + (((fn) << 12) & GENMASK(19, 12)))
#define ROCKCHIP_PCIE_EP_VIRT_FUNC_BASE(fn) \
(PCIE_EP_PF_CONFIG_REGS_BASE + 0x10000 + (((fn) << 12) & GENMASK(19, 12)))
#define ROCKCHIP_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar) \
(PCIE_RC_RP_ATS_BASE + 0x0840 + (fn) * 0x0040 + (bar) * 0x0008)
(PCIE_CORE_AXI_CONF_BASE + 0x0828 + (fn) * 0x0040 + (bar) * 0x0008)
#define ROCKCHIP_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar) \
(PCIE_RC_RP_ATS_BASE + 0x0844 + (fn) * 0x0040 + (bar) * 0x0008)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r) \
(PCIE_RC_RP_ATS_BASE + 0x0000 + ((r) & 0x1f) * 0x0020)
(PCIE_CORE_AXI_CONF_BASE + 0x082c + (fn) * 0x0040 + (bar) * 0x0008)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN_MASK GENMASK(19, 12)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN(devfn) \
(((devfn) << 12) & \
ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN_MASK)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_BUS_MASK GENMASK(27, 20)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_BUS(bus) \
(((bus) << 20) & ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_BUS_MASK)
#define PCIE_RC_EP_ATR_OB_REGIONS_1_32 (PCIE_CORE_AXI_CONF_BASE + 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r) \
(PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0000 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR1(r) \
(PCIE_RC_RP_ATS_BASE + 0x0004 + ((r) & 0x1f) * 0x0020)
(PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0004 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID BIT(23)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN_MASK GENMASK(31, 24)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN(devfn) \
(((devfn) << 24) & ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN_MASK)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0(r) \
(PCIE_RC_RP_ATS_BASE + 0x0008 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r) \
(PCIE_RC_RP_ATS_BASE + 0x000c + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR0(r) \
(PCIE_RC_RP_ATS_BASE + 0x0018 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR1(r) \
(PCIE_RC_RP_ATS_BASE + 0x001c + ((r) & 0x1f) * 0x0020)
(PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0008 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r) \
(PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x000c + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC2(r) \
(PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0010 + ((r) & 0x1f) * 0x0020)

#define ROCKCHIP_PCIE_CORE_EP_FUNC_BAR_CFG0(fn) \
(PCIE_CORE_CTRL_MGMT_BASE + 0x0240 + (fn) * 0x0008)
Expand Down

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