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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 6/9] vpci/header: Handle p2m range sets per BAR
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
Instead of handling a single range set, that contains all the memory
regions of all the BARs and ROM, have them per BAR.
This is in preparation of making non-identity mappings in p2m for the
MMIOs/ROM.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---
xen/drivers/vpci/header.c | 172 ++++++++++++++++++++++++++------------
xen/include/xen/vpci.h | 3 +-
2 files changed, 122 insertions(+), 53 deletions(-)
diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c
index 793f79ece831..7f54199a3894 100644
--- a/xen/drivers/vpci/header.c
+++ b/xen/drivers/vpci/header.c
@@ -131,49 +131,75 @@ static void modify_decoding(const struct pci_dev *pdev,
uint16_t cmd,
bool vpci_process_pending(struct vcpu *v)
{
- if ( v->vpci.mem )
+ if ( v->vpci.num_mem_ranges )
{
struct map_data data = {
.d = v->domain,
.map = v->vpci.cmd & PCI_COMMAND_MEMORY,
};
- int rc = rangeset_consume_ranges(v->vpci.mem, map_range, &data);
+ struct pci_dev *pdev = v->vpci.pdev;
+ struct vpci_header *header = &pdev->vpci->header;
+ unsigned int i;
- if ( rc == -ERESTART )
- return true;
+ for ( i = 0; i < ARRAY_SIZE(header->bars); i++ )
+ {
+ struct vpci_bar *bar = &header->bars[i];
+ int rc;
- spin_lock(&v->vpci.pdev->vpci->lock);
- /* Disable memory decoding unconditionally on failure. */
- modify_decoding(v->vpci.pdev,
- rc ? v->vpci.cmd & ~PCI_COMMAND_MEMORY : v->vpci.cmd,
- !rc && v->vpci.rom_only);
- spin_unlock(&v->vpci.pdev->vpci->lock);
+ if ( !bar->mem )
+ continue;
- rangeset_destroy(v->vpci.mem);
- v->vpci.mem = NULL;
- if ( rc )
- /*
- * FIXME: in case of failure remove the device from the domain.
- * Note that there might still be leftover mappings. While this is
- * safe for Dom0, for DomUs the domain will likely need to be
- * killed in order to avoid leaking stale p2m mappings on
- * failure.
- */
- vpci_remove_device(v->vpci.pdev);
+ rc = rangeset_consume_ranges(bar->mem, map_range, &data);
+
+ if ( rc == -ERESTART )
+ return true;
+
+ spin_lock(&pdev->vpci->lock);
+ /* Disable memory decoding unconditionally on failure. */
+ modify_decoding(pdev,
+ rc ? v->vpci.cmd & ~PCI_COMMAND_MEMORY :
v->vpci.cmd,
+ !rc && v->vpci.rom_only);
+ spin_unlock(&pdev->vpci->lock);
+
+ rangeset_destroy(bar->mem);
+ bar->mem = NULL;
+ v->vpci.num_mem_ranges--;
+ if ( rc )
+ /*
+ * FIXME: in case of failure remove the device from the domain.
+ * Note that there might still be leftover mappings. While
this is
+ * safe for Dom0, for DomUs the domain will likely need to be
+ * killed in order to avoid leaking stale p2m mappings on
+ * failure.
+ */
+ vpci_remove_device(pdev);
+ }
}
return false;
}
static int __init apply_map(struct domain *d, const struct pci_dev *pdev,
- struct rangeset *mem, uint16_t cmd)
+ uint16_t cmd)
{
struct map_data data = { .d = d, .map = true };
- int rc;
+ struct vpci_header *header = &pdev->vpci->header;
+ int rc = 0;
+ unsigned int i;
+
+ for ( i = 0; i < ARRAY_SIZE(header->bars); i++ )
+ {
+ struct vpci_bar *bar = &header->bars[i];
- while ( (rc = rangeset_consume_ranges(mem, map_range, &data)) == -ERESTART
)
- process_pending_softirqs();
- rangeset_destroy(mem);
+ if ( !bar->mem )
+ continue;
+
+ while ( (rc = rangeset_consume_ranges(bar->mem, map_range,
+ &data)) == -ERESTART )
+ process_pending_softirqs();
+ rangeset_destroy(bar->mem);
+ bar->mem = NULL;
+ }
if ( !rc )
modify_decoding(pdev, cmd, false);
@@ -181,7 +207,7 @@ static int __init apply_map(struct domain *d, const struct
pci_dev *pdev,
}
static void defer_map(struct domain *d, struct pci_dev *pdev,
- struct rangeset *mem, uint16_t cmd, bool rom_only)
+ uint16_t cmd, bool rom_only, uint8_t num_mem_ranges)
{
struct vcpu *curr = current;
@@ -192,9 +218,9 @@ static void defer_map(struct domain *d, struct pci_dev
*pdev,
* started for the same device if the domain is not well-behaved.
*/
curr->vpci.pdev = pdev;
- curr->vpci.mem = mem;
curr->vpci.cmd = cmd;
curr->vpci.rom_only = rom_only;
+ curr->vpci.num_mem_ranges = num_mem_ranges;
/*
* Raise a scheduler softirq in order to prevent the guest from resuming
* execution with pending mapping operations, to trigger the invocation
@@ -206,42 +232,47 @@ static void defer_map(struct domain *d, struct pci_dev
*pdev,
static int modify_bars(const struct pci_dev *pdev, uint16_t cmd, bool rom_only)
{
struct vpci_header *header = &pdev->vpci->header;
- struct rangeset *mem = rangeset_new(NULL, NULL, 0);
struct pci_dev *tmp, *dev = NULL;
const struct vpci_msix *msix = pdev->vpci->msix;
- unsigned int i;
+ unsigned int i, j;
int rc;
-
- if ( !mem )
- return -ENOMEM;
+ uint8_t num_mem_ranges;
/*
- * Create a rangeset that represents the current device BARs memory region
+ * Create a rangeset per BAR that represents the current device memory
region
* and compare it against all the currently active BAR memory regions. If
* an overlap is found, subtract it from the region to be mapped/unmapped.
*
- * First fill the rangeset with all the BARs of this device or with the ROM
+ * First fill the rangesets with all the BARs of this device or with the
ROM
* BAR only, depending on whether the guest is toggling the memory decode
* bit of the command register, or the enable bit of the ROM BAR register.
*/
for ( i = 0; i < ARRAY_SIZE(header->bars); i++ )
{
- const struct vpci_bar *bar = &header->bars[i];
+ struct vpci_bar *bar = &header->bars[i];
unsigned long start = PFN_DOWN(bar->addr);
unsigned long end = PFN_DOWN(bar->addr + bar->size - 1);
+ bar->mem = NULL;
+
if ( !MAPPABLE_BAR(bar) ||
(rom_only ? bar->type != VPCI_BAR_ROM
: (bar->type == VPCI_BAR_ROM && !header->rom_enabled)) )
continue;
- rc = rangeset_add_range(mem, start, end);
+ bar->mem = rangeset_new(NULL, NULL, 0);
+ if ( !bar->mem )
+ {
+ rc = -ENOMEM;
+ goto fail;
+ }
+
+ rc = rangeset_add_range(bar->mem, start, end);
if ( rc )
{
printk(XENLOG_G_WARNING "Failed to add [%lx, %lx]: %d\n",
start, end, rc);
- rangeset_destroy(mem);
- return rc;
+ goto fail;
}
}
@@ -252,14 +283,21 @@ static int modify_bars(const struct pci_dev *pdev,
uint16_t cmd, bool rom_only)
unsigned long end = PFN_DOWN(vmsix_table_addr(pdev->vpci, i) +
vmsix_table_size(pdev->vpci, i) - 1);
- rc = rangeset_remove_range(mem, start, end);
- if ( rc )
+ for ( j = 0; j < ARRAY_SIZE(header->bars); j++ )
{
- printk(XENLOG_G_WARNING
- "Failed to remove MSIX table [%lx, %lx]: %d\n",
- start, end, rc);
- rangeset_destroy(mem);
- return rc;
+ const struct vpci_bar *bar = &header->bars[j];
+
+ if ( !bar->mem )
+ continue;
+
+ rc = rangeset_remove_range(bar->mem, start, end);
+ if ( rc )
+ {
+ printk(XENLOG_G_WARNING
+ "Failed to remove MSIX table [%lx, %lx]: %d\n",
+ start, end, rc);
+ goto fail;
+ }
}
}
@@ -291,7 +329,8 @@ static int modify_bars(const struct pci_dev *pdev, uint16_t
cmd, bool rom_only)
unsigned long start = PFN_DOWN(bar->addr);
unsigned long end = PFN_DOWN(bar->addr + bar->size - 1);
- if ( !bar->enabled || !rangeset_overlaps_range(mem, start, end) ||
+ if ( !bar->enabled ||
+ !rangeset_overlaps_range(bar->mem, start, end) ||
/*
* If only the ROM enable bit is toggled check against other
* BARs in the same device for overlaps, but not against the
@@ -300,13 +339,12 @@ static int modify_bars(const struct pci_dev *pdev,
uint16_t cmd, bool rom_only)
(rom_only && tmp == pdev && bar->type == VPCI_BAR_ROM) )
continue;
- rc = rangeset_remove_range(mem, start, end);
+ rc = rangeset_remove_range(bar->mem, start, end);
if ( rc )
{
printk(XENLOG_G_WARNING "Failed to remove [%lx, %lx]: %d\n",
start, end, rc);
- rangeset_destroy(mem);
- return rc;
+ goto fail;
}
}
}
@@ -324,12 +362,42 @@ static int modify_bars(const struct pci_dev *pdev,
uint16_t cmd, bool rom_only)
* will always be to establish mappings and process all the BARs.
*/
ASSERT((cmd & PCI_COMMAND_MEMORY) && !rom_only);
- return apply_map(pdev->domain, pdev, mem, cmd);
+ return apply_map(pdev->domain, pdev, cmd);
}
- defer_map(dev->domain, dev, mem, cmd, rom_only);
+ /* Find out how many memory ranges has left after MSI and overlaps. */
+ num_mem_ranges = 0;
+ for ( i = 0; i < ARRAY_SIZE(header->bars); i++ )
+ {
+ struct vpci_bar *bar = &header->bars[i];
+
+ if ( !rangeset_is_empty(bar->mem) )
+ num_mem_ranges++;
+ }
+
+ /*
+ * There are cases when PCI device, root port for example, has neither
+ * memory space nor IO. In this case PCI command register write is
+ * missed resulting in the underlying PCI device not functional, so:
+ * - if there are no regions write the command register now
+ * - if there are regions then defer work and write later on
+ */
+ if ( !num_mem_ranges )
+ pci_conf_write16(pdev->sbdf, PCI_COMMAND, cmd);
+ else
+ defer_map(dev->domain, dev, cmd, rom_only, num_mem_ranges);
return 0;
+
+fail:
+ for ( i = 0; i < ARRAY_SIZE(header->bars); i++ )
+ {
+ struct vpci_bar *bar = &header->bars[i];
+
+ rangeset_destroy(bar->mem);
+ bar->mem = NULL;
+ }
+ return rc;
}
static void cmd_write(const struct pci_dev *pdev, unsigned int reg,
diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h
index db86b8e7fa3c..a0cbdb4bf4fd 100644
--- a/xen/include/xen/vpci.h
+++ b/xen/include/xen/vpci.h
@@ -82,6 +82,7 @@ struct vpci {
/* Guest view of the BAR. */
uint64_t guest_addr;
uint64_t size;
+ struct rangeset *mem;
enum {
VPCI_BAR_EMPTY,
VPCI_BAR_IO,
@@ -156,9 +157,9 @@ struct vpci {
struct vpci_vcpu {
/* Per-vcpu structure to store state while {un}mapping of PCI BARs. */
- struct rangeset *mem;
struct pci_dev *pdev;
uint16_t cmd;
+ uint8_t num_mem_ranges;
bool rom_only : 1;
};
--
2.25.1
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